# viewport.cpp

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    00001 /* $Id: viewport.cpp 24975 2013-02-06 17:51:05Z frosch $ */
    00002
    00003 /*
    00004  * This file is part of OpenTTD.
    00005  * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
    00006  * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
    00007  * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
    00008  */
    00009
    00029 #include "stdafx.h"
    00030 #include "landscape.h"
    00031 #include "viewport_func.h"
    00032 #include "station_base.h"
    00033 #include "waypoint_base.h"
    00034 #include "town.h"
    00035 #include "signs_base.h"
    00036 #include "signs_func.h"
    00037 #include "vehicle_base.h"
    00038 #include "vehicle_gui.h"
    00039 #include "blitter/factory.hpp"
    00040 #include "strings_func.h"
    00041 #include "zoom_func.h"
    00042 #include "vehicle_func.h"
    00043 #include "company_func.h"
    00044 #include "waypoint_func.h"
    00045 #include "window_func.h"
    00046 #include "tilehighlight_func.h"
    00047 #include "window_gui.h"
    00048
    00049 #include "table/strings.h"
    00050 #include "table/palettes.h"
    00051
    00052 Point _tile_fract_coords;
    00053
    00054 struct StringSpriteToDraw {
    00055   StringID string;
    00056   Colours colour;
    00057   int32 x;
    00058   int32 y;
    00059   uint64 params[2];
    00060   uint16 width;
    00061 };
    00062
    00063 struct TileSpriteToDraw {
    00064   SpriteID image;
    00065   PaletteID pal;
    00066   const SubSprite *sub;
    00067   int32 x;
    00068   int32 y;
    00069 };
    00070
    00071 struct ChildScreenSpriteToDraw {
    00072   SpriteID image;
    00073   PaletteID pal;
    00074   const SubSprite *sub;
    00075   int32 x;
    00076   int32 y;
    00077   int next;
    00078 };
    00079
    00081 struct ParentSpriteToDraw {
    00082   SpriteID image;
    00083   PaletteID pal;
    00084   const SubSprite *sub;
    00085
    00086   int32 x;
    00087   int32 y;
    00088
    00089   int32 left;
    00090   int32 top;
    00091
    00092   int32 xmin;
    00093   int32 xmax;
    00094   int32 ymin;
    00095   int32 ymax;
    00096   int zmin;
    00097   int zmax;
    00098
    00099   int first_child;
    00100   bool comparison_done;
    00101 };
    00102
    00104 enum FoundationPart {
    00105   FOUNDATION_PART_NONE     = 0xFF,
    00106   FOUNDATION_PART_NORMAL   = 0,
    00107   FOUNDATION_PART_HALFTILE = 1,
    00108   FOUNDATION_PART_END
    00109 };
    00110
    00115 enum SpriteCombineMode {
    00116   SPRITE_COMBINE_NONE,
    00117   SPRITE_COMBINE_PENDING,
    00118   SPRITE_COMBINE_ACTIVE,
    00119 };
    00120
    00121 typedef SmallVector<TileSpriteToDraw, 64> TileSpriteToDrawVector;
    00122 typedef SmallVector<StringSpriteToDraw, 4> StringSpriteToDrawVector;
    00123 typedef SmallVector<ParentSpriteToDraw, 64> ParentSpriteToDrawVector;
    00124 typedef SmallVector<ParentSpriteToDraw*, 64> ParentSpriteToSortVector;
    00125 typedef SmallVector<ChildScreenSpriteToDraw, 16> ChildScreenSpriteToDrawVector;
    00126
    00128 struct ViewportDrawer {
    00129   DrawPixelInfo dpi;
    00130
    00131   StringSpriteToDrawVector string_sprites_to_draw;
    00132   TileSpriteToDrawVector tile_sprites_to_draw;
    00133   ParentSpriteToDrawVector parent_sprites_to_draw;
    00134   ParentSpriteToSortVector parent_sprites_to_sort;
    00135   ChildScreenSpriteToDrawVector child_screen_sprites_to_draw;
    00136
    00137   int *last_child;
    00138
    00139   SpriteCombineMode combine_sprites;
    00140
    00141   int foundation[FOUNDATION_PART_END];
    00142   FoundationPart foundation_part;
    00143   int *last_foundation_child[FOUNDATION_PART_END];
    00144   Point foundation_offset[FOUNDATION_PART_END];
    00145 };
    00146
    00147 static void MarkViewportDirty(const ViewPort *vp, int left, int top, int right, int bottom);
    00148
    00149 static ViewportDrawer _vd;
    00150
    00151 TileHighlightData _thd;
    00152 static TileInfo *_cur_ti;
    00153 bool _draw_bounding_boxes = false;
    00154 bool _draw_dirty_blocks = false;
    00155 uint _dirty_block_colour = 0;
    00156
    00157 static Point MapXYZToViewport(const ViewPort *vp, int x, int y, int z)
    00158 {
    00159   Point p = RemapCoords(x, y, z);
    00160   p.x -= vp->virtual_width / 2;
    00161   p.y -= vp->virtual_height / 2;
    00162   return p;
    00163 }
    00164
    00165 void DeleteWindowViewport(Window *w)
    00166 {
    00167   free(w->viewport);
    00168   w->viewport = NULL;
    00169 }
    00170
    00183 void InitializeWindowViewport(Window *w, int x, int y,
    00184   int width, int height, uint32 follow_flags, ZoomLevel zoom)
    00185 {
    00186   assert(w->viewport == NULL);
    00187
    00188   ViewportData *vp = CallocT<ViewportData>(1);
    00189
    00190   vp->left = x + w->left;
    00191   vp->top = y + w->top;
    00192   vp->width = width;
    00193   vp->height = height;
    00194
    00195   vp->zoom = static_cast<ZoomLevel>(Clamp(zoom, _settings_client.gui.zoom_min, _settings_client.gui.zoom_max));
    00196
    00197   vp->virtual_width = ScaleByZoom(width, zoom);
    00198   vp->virtual_height = ScaleByZoom(height, zoom);
    00199
    00200   Point pt;
    00201
    00202   if (follow_flags & 0x80000000) {
    00203     const Vehicle *veh;
    00204
    00205     vp->follow_vehicle = (VehicleID)(follow_flags & 0xFFFFF);
    00206     veh = Vehicle::Get(vp->follow_vehicle);
    00207     pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos);
    00208   } else {
    00209     uint x = TileX(follow_flags) * TILE_SIZE;
    00210     uint y = TileY(follow_flags) * TILE_SIZE;
    00211
    00212     vp->follow_vehicle = INVALID_VEHICLE;
    00213     pt = MapXYZToViewport(vp, x, y, GetSlopePixelZ(x, y));
    00214   }
    00215
    00216   vp->scrollpos_x = pt.x;
    00217   vp->scrollpos_y = pt.y;
    00218   vp->dest_scrollpos_x = pt.x;
    00219   vp->dest_scrollpos_y = pt.y;
    00220
    00221   w->viewport = vp;
    00222   vp->virtual_left = 0;//pt.x;
    00223   vp->virtual_top = 0;//pt.y;
    00224 }
    00225
    00226 static Point _vp_move_offs;
    00227
    00228 static void DoSetViewportPosition(const Window *w, int left, int top, int width, int height)
    00229 {
    00230   FOR_ALL_WINDOWS_FROM_BACK_FROM(w, w) {
    00231     if (left + width > w->left &&
    00232         w->left + w->width > left &&
    00233         top + height > w->top &&
    00234         w->top + w->height > top) {
    00235
    00236       if (left < w->left) {
    00237         DoSetViewportPosition(w, left, top, w->left - left, height);
    00238         DoSetViewportPosition(w, left + (w->left - left), top, width - (w->left - left), height);
    00239         return;
    00240       }
    00241
    00242       if (left + width > w->left + w->width) {
    00243         DoSetViewportPosition(w, left, top, (w->left + w->width - left), height);
    00244         DoSetViewportPosition(w, left + (w->left + w->width - left), top, width - (w->left + w->width - left), height);
    00245         return;
    00246       }
    00247
    00248       if (top < w->top) {
    00249         DoSetViewportPosition(w, left, top, width, (w->top - top));
    00250         DoSetViewportPosition(w, left, top + (w->top - top), width, height - (w->top - top));
    00251         return;
    00252       }
    00253
    00254       if (top + height > w->top + w->height) {
    00255         DoSetViewportPosition(w, left, top, width, (w->top + w->height - top));
    00256         DoSetViewportPosition(w, left, top + (w->top + w->height - top), width, height - (w->top + w->height - top));
    00257         return;
    00258       }
    00259
    00260       return;
    00261     }
    00262   }
    00263
    00264   {
    00265     int xo = _vp_move_offs.x;
    00266     int yo = _vp_move_offs.y;
    00267
    00268     if (abs(xo) >= width || abs(yo) >= height) {
    00269       /* fully_outside */
    00270       RedrawScreenRect(left, top, left + width, top + height);
    00271       return;
    00272     }
    00273
    00274     GfxScroll(left, top, width, height, xo, yo);
    00275
    00276     if (xo > 0) {
    00277       RedrawScreenRect(left, top, xo + left, top + height);
    00278       left += xo;
    00279       width -= xo;
    00280     } else if (xo < 0) {
    00281       RedrawScreenRect(left + width + xo, top, left + width, top + height);
    00282       width += xo;
    00283     }
    00284
    00285     if (yo > 0) {
    00286       RedrawScreenRect(left, top, width + left, top + yo);
    00287     } else if (yo < 0) {
    00288       RedrawScreenRect(left, top + height + yo, width + left, top + height);
    00289     }
    00290   }
    00291 }
    00292
    00293 static void SetViewportPosition(Window *w, int x, int y)
    00294 {
    00295   ViewPort *vp = w->viewport;
    00296   int old_left = vp->virtual_left;
    00297   int old_top = vp->virtual_top;
    00298   int i;
    00299   int left, top, width, height;
    00300
    00301   vp->virtual_left = x;
    00302   vp->virtual_top = y;
    00303
    00304   /* Viewport is bound to its left top corner, so it must be rounded down (UnScaleByZoomLower)
    00305    * else glitch described in FS#1412 will happen (offset by 1 pixel with zoom level > NORMAL)
    00306    */
    00307   old_left = UnScaleByZoomLower(old_left, vp->zoom);
    00308   old_top = UnScaleByZoomLower(old_top, vp->zoom);
    00309   x = UnScaleByZoomLower(x, vp->zoom);
    00310   y = UnScaleByZoomLower(y, vp->zoom);
    00311
    00312   old_left -= x;
    00313   old_top -= y;
    00314
    00315   if (old_top == 0 && old_left == 0) return;
    00316
    00317   _vp_move_offs.x = old_left;
    00318   _vp_move_offs.y = old_top;
    00319
    00320   left = vp->left;
    00321   top = vp->top;
    00322   width = vp->width;
    00323   height = vp->height;
    00324
    00325   if (left < 0) {
    00326     width += left;
    00327     left = 0;
    00328   }
    00329
    00330   i = left + width - _screen.width;
    00331   if (i >= 0) width -= i;
    00332
    00333   if (width > 0) {
    00334     if (top < 0) {
    00335       height += top;
    00336       top = 0;
    00337     }
    00338
    00339     i = top + height - _screen.height;
    00340     if (i >= 0) height -= i;
    00341
    00342     if (height > 0) DoSetViewportPosition(w->z_front, left, top, width, height);
    00343   }
    00344 }
    00345
    00354 ViewPort *IsPtInWindowViewport(const Window *w, int x, int y)
    00355 {
    00356   ViewPort *vp = w->viewport;
    00357
    00358   if (vp != NULL &&
    00359       IsInsideMM(x, vp->left, vp->left + vp->width) &&
    00360       IsInsideMM(y, vp->top, vp->top + vp->height))
    00361     return vp;
    00362
    00363   return NULL;
    00364 }
    00365
    00373 static Point TranslateXYToTileCoord(const ViewPort *vp, int x, int y)
    00374 {
    00375   Point pt;
    00376   int a, b;
    00377   int z;
    00378
    00379   if ( (uint)(x -= vp->left) >= (uint)vp->width ||
    00380         (uint)(y -= vp->top) >= (uint)vp->height) {
    00381         Point pt = {-1, -1};
    00382         return pt;
    00383   }
    00384
    00385   x = (ScaleByZoom(x, vp->zoom) + vp->virtual_left) >> (2 + ZOOM_LVL_SHIFT);
    00386   y = (ScaleByZoom(y, vp->zoom) + vp->virtual_top) >> (1 + ZOOM_LVL_SHIFT);
    00387
    00388   a = y - x;
    00389   b = y + x;
    00390
    00391   /* we need to move variables in to the valid range, as the
    00392    * GetTileZoomCenterWindow() function can call here with invalid x and/or y,
    00393    * when the user tries to zoom out along the sides of the map */
    00394   a = Clamp(a, -4 * (int)TILE_SIZE, (int)(MapMaxX() * TILE_SIZE) - 1);
    00395   b = Clamp(b, -4 * (int)TILE_SIZE, (int)(MapMaxY() * TILE_SIZE) - 1);
    00396
    00397   /* (a, b) is the X/Y-world coordinate that belongs to (x,y) if the landscape would be completely flat on height 0.
    00398    * Now find the Z-world coordinate by fix point iteration.
    00399    * This is a bit tricky because the tile height is non-continuous at foundations.
    00400    * The clicked point should be approached from the back, otherwise there are regions that are not clickable.
    00401    * (FOUNDATION_HALFTILE_LOWER on SLOPE_STEEP_S hides north halftile completely)
    00402    * So give it a z-malus of 4 in the first iterations.
    00403    */
    00404   z = 0;
    00405
    00406   int min_coord = _settings_game.construction.freeform_edges ? TILE_SIZE : 0;
    00407
    00408   for (int i = 0; i < 5; i++) z = GetSlopePixelZ(Clamp(a + max(z, 4) - 4, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + max(z, 4) - 4, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
    00409   for (int malus = 3; malus > 0; malus--) z = GetSlopePixelZ(Clamp(a + max(z, malus) - malus, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + max(z, malus) - malus, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
    00410   for (int i = 0; i < 5; i++) z = GetSlopePixelZ(Clamp(a + z, min_coord, MapMaxX() * TILE_SIZE - 1), Clamp(b + z, min_coord, MapMaxY() * TILE_SIZE - 1)) / 2;
    00411
    00412   pt.x = Clamp(a + z, min_coord, MapMaxX() * TILE_SIZE - 1);
    00413   pt.y = Clamp(b + z, min_coord, MapMaxY() * TILE_SIZE - 1);
    00414
    00415   return pt;
    00416 }
    00417
    00418 /* When used for zooming, check area below current coordinates (x,y)
    00419  * and return the tile of the zoomed out/in position (zoom_x, zoom_y)
    00420  * when you just want the tile, make x = zoom_x and y = zoom_y */
    00421 static Point GetTileFromScreenXY(int x, int y, int zoom_x, int zoom_y)
    00422 {
    00423   Window *w;
    00424   ViewPort *vp;
    00425   Point pt;
    00426
    00427   if ( (w = FindWindowFromPt(x, y)) != NULL &&
    00428        (vp = IsPtInWindowViewport(w, x, y)) != NULL)
    00429         return TranslateXYToTileCoord(vp, zoom_x, zoom_y);
    00430
    00431   pt.y = pt.x = -1;
    00432   return pt;
    00433 }
    00434
    00435 Point GetTileBelowCursor()
    00436 {
    00437   return GetTileFromScreenXY(_cursor.pos.x, _cursor.pos.y, _cursor.pos.x, _cursor.pos.y);
    00438 }
    00439
    00440
    00441 Point GetTileZoomCenterWindow(bool in, Window * w)
    00442 {
    00443   int x, y;
    00444   ViewPort *vp = w->viewport;
    00445
    00446   if (in) {
    00447     x = ((_cursor.pos.x - vp->left) >> 1) + (vp->width >> 2);
    00448     y = ((_cursor.pos.y - vp->top) >> 1) + (vp->height >> 2);
    00449   } else {
    00450     x = vp->width - (_cursor.pos.x - vp->left);
    00451     y = vp->height - (_cursor.pos.y - vp->top);
    00452   }
    00453   /* Get the tile below the cursor and center on the zoomed-out center */
    00454   return GetTileFromScreenXY(_cursor.pos.x, _cursor.pos.y, x + vp->left, y + vp->top);
    00455 }
    00456
    00465 void HandleZoomMessage(Window *w, const ViewPort *vp, byte widget_zoom_in, byte widget_zoom_out)
    00466 {
    00467   w->SetWidgetDisabledState(widget_zoom_in, vp->zoom <= _settings_client.gui.zoom_min);
    00468   w->SetWidgetDirty(widget_zoom_in);
    00469
    00470   w->SetWidgetDisabledState(widget_zoom_out, vp->zoom >= _settings_client.gui.zoom_max);
    00471   w->SetWidgetDirty(widget_zoom_out);
    00472 }
    00473
    00486 static void AddTileSpriteToDraw(SpriteID image, PaletteID pal, int32 x, int32 y, int z, const SubSprite *sub = NULL, int extra_offs_x = 0, int extra_offs_y = 0)
    00487 {
    00488   assert((image & SPRITE_MASK) < MAX_SPRITES);
    00489
    00490   TileSpriteToDraw *ts = _vd.tile_sprites_to_draw.Append();
    00491   ts->image = image;
    00492   ts->pal = pal;
    00493   ts->sub = sub;
    00494   Point pt = RemapCoords(x, y, z);
    00495   ts->x = pt.x + extra_offs_x;
    00496   ts->y = pt.y + extra_offs_y;
    00497 }
    00498
    00511 static void AddChildSpriteToFoundation(SpriteID image, PaletteID pal, const SubSprite *sub, FoundationPart foundation_part, int extra_offs_x, int extra_offs_y)
    00512 {
    00513   assert(IsInsideMM(foundation_part, 0, FOUNDATION_PART_END));
    00514   assert(_vd.foundation[foundation_part] != -1);
    00515   Point offs = _vd.foundation_offset[foundation_part];
    00516
    00517   /* Change the active ChildSprite list to the one of the foundation */
    00518   int *old_child = _vd.last_child;
    00519   _vd.last_child = _vd.last_foundation_child[foundation_part];
    00520
    00521   AddChildSpriteScreen(image, pal, offs.x + extra_offs_x, offs.y + extra_offs_y, false, sub, false);
    00522
    00523   /* Switch back to last ChildSprite list */
    00524   _vd.last_child = old_child;
    00525 }
    00526
    00540 void DrawGroundSpriteAt(SpriteID image, PaletteID pal, int32 x, int32 y, int z, const SubSprite *sub, int extra_offs_x, int extra_offs_y)
    00541 {
    00542   /* Switch to first foundation part, if no foundation was drawn */
    00543   if (_vd.foundation_part == FOUNDATION_PART_NONE) _vd.foundation_part = FOUNDATION_PART_NORMAL;
    00544
    00545   if (_vd.foundation[_vd.foundation_part] != -1) {
    00546     Point pt = RemapCoords(x, y, z);
    00547     AddChildSpriteToFoundation(image, pal, sub, _vd.foundation_part, pt.x + extra_offs_x * ZOOM_LVL_BASE, pt.y + extra_offs_y * ZOOM_LVL_BASE);
    00548   } else {
    00549     AddTileSpriteToDraw(image, pal, _cur_ti->x + x, _cur_ti->y + y, _cur_ti->z + z, sub, extra_offs_x * ZOOM_LVL_BASE, extra_offs_y * ZOOM_LVL_BASE);
    00550   }
    00551 }
    00552
    00563 void DrawGroundSprite(SpriteID image, PaletteID pal, const SubSprite *sub, int extra_offs_x, int extra_offs_y)
    00564 {
    00565   DrawGroundSpriteAt(image, pal, 0, 0, 0, sub, extra_offs_x, extra_offs_y);
    00566 }
    00567
    00575 void OffsetGroundSprite(int x, int y)
    00576 {
    00577   /* Switch to next foundation part */
    00578   switch (_vd.foundation_part) {
    00579     case FOUNDATION_PART_NONE:
    00580       _vd.foundation_part = FOUNDATION_PART_NORMAL;
    00581       break;
    00582     case FOUNDATION_PART_NORMAL:
    00583       _vd.foundation_part = FOUNDATION_PART_HALFTILE;
    00584       break;
    00585     default: NOT_REACHED();
    00586   }
    00587
    00588   /* _vd.last_child == NULL if foundation sprite was clipped by the viewport bounds */
    00589   if (_vd.last_child != NULL) _vd.foundation[_vd.foundation_part] = _vd.parent_sprites_to_draw.Length() - 1;
    00590
    00591   _vd.foundation_offset[_vd.foundation_part].x = x * ZOOM_LVL_BASE;
    00592   _vd.foundation_offset[_vd.foundation_part].y = y * ZOOM_LVL_BASE;
    00593   _vd.last_foundation_child[_vd.foundation_part] = _vd.last_child;
    00594 }
    00595
    00607 static void AddCombinedSprite(SpriteID image, PaletteID pal, int x, int y, int z, const SubSprite *sub)
    00608 {
    00609   Point pt = RemapCoords(x, y, z);
    00610   const Sprite *spr = GetSprite(image & SPRITE_MASK, ST_NORMAL);
    00611
    00612   if (pt.x + spr->x_offs >= _vd.dpi.left + _vd.dpi.width ||
    00613       pt.x + spr->x_offs + spr->width <= _vd.dpi.left ||
    00614       pt.y + spr->y_offs >= _vd.dpi.top + _vd.dpi.height ||
    00615       pt.y + spr->y_offs + spr->height <= _vd.dpi.top)
    00616     return;
    00617
    00618   const ParentSpriteToDraw *pstd = _vd.parent_sprites_to_draw.End() - 1;
    00619   AddChildSpriteScreen(image, pal, pt.x - pstd->left, pt.y - pstd->top, false, sub, false);
    00620 }
    00621
    00647 void AddSortableSpriteToDraw(SpriteID image, PaletteID pal, int x, int y, int w, int h, int dz, int z, bool transparent, int bb_offset_x, int bb_offset_y, int bb_offset_z, const SubSprite *sub)
    00648 {
    00649   int32 left, right, top, bottom;
    00650
    00651   assert((image & SPRITE_MASK) < MAX_SPRITES);
    00652
    00653   /* make the sprites transparent with the right palette */
    00654   if (transparent) {
    00655     SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
    00656     pal = PALETTE_TO_TRANSPARENT;
    00657   }
    00658
    00659   if (_vd.combine_sprites == SPRITE_COMBINE_ACTIVE) {
    00660     AddCombinedSprite(image, pal, x, y, z, sub);
    00661     return;
    00662   }
    00663
    00664   _vd.last_child = NULL;
    00665
    00666   Point pt = RemapCoords(x, y, z);
    00667   int tmp_left, tmp_top, tmp_x = pt.x, tmp_y = pt.y;
    00668
    00669   /* Compute screen extents of sprite */
    00670   if (image == SPR_EMPTY_BOUNDING_BOX) {
    00671     left = tmp_left = RemapCoords(x + w          , y + bb_offset_y, z + bb_offset_z).x;
    00672     right           = RemapCoords(x + bb_offset_x, y + h          , z + bb_offset_z).x + 1;
    00673     top  = tmp_top  = RemapCoords(x + bb_offset_x, y + bb_offset_y, z + dz         ).y;
    00674     bottom          = RemapCoords(x + w          , y + h          , z + bb_offset_z).y + 1;
    00675   } else {
    00676     const Sprite *spr = GetSprite(image & SPRITE_MASK, ST_NORMAL);
    00677     left = tmp_left = (pt.x += spr->x_offs);
    00678     right           = (pt.x +  spr->width );
    00679     top  = tmp_top  = (pt.y += spr->y_offs);
    00680     bottom          = (pt.y +  spr->height);
    00681   }
    00682
    00683   if (_draw_bounding_boxes && (image != SPR_EMPTY_BOUNDING_BOX)) {
    00684     /* Compute maximal extents of sprite and its bounding box */
    00685     left   = min(left  , RemapCoords(x + w          , y + bb_offset_y, z + bb_offset_z).x);
    00686     right  = max(right , RemapCoords(x + bb_offset_x, y + h          , z + bb_offset_z).x + 1);
    00687     top    = min(top   , RemapCoords(x + bb_offset_x, y + bb_offset_y, z + dz         ).y);
    00688     bottom = max(bottom, RemapCoords(x + w          , y + h          , z + bb_offset_z).y + 1);
    00689   }
    00690
    00691   /* Do not add the sprite to the viewport, if it is outside */
    00692   if (left   >= _vd.dpi.left + _vd.dpi.width ||
    00693       right  <= _vd.dpi.left                 ||
    00694       top    >= _vd.dpi.top + _vd.dpi.height ||
    00695       bottom <= _vd.dpi.top) {
    00696     return;
    00697   }
    00698
    00699   ParentSpriteToDraw *ps = _vd.parent_sprites_to_draw.Append();
    00700   ps->x = tmp_x;
    00701   ps->y = tmp_y;
    00702
    00703   ps->left = tmp_left;
    00704   ps->top  = tmp_top;
    00705
    00706   ps->image = image;
    00707   ps->pal = pal;
    00708   ps->sub = sub;
    00709   ps->xmin = x + bb_offset_x;
    00710   ps->xmax = x + max(bb_offset_x, w) - 1;
    00711
    00712   ps->ymin = y + bb_offset_y;
    00713   ps->ymax = y + max(bb_offset_y, h) - 1;
    00714
    00715   ps->zmin = z + bb_offset_z;
    00716   ps->zmax = z + max(bb_offset_z, dz) - 1;
    00717
    00718   ps->comparison_done = false;
    00719   ps->first_child = -1;
    00720
    00721   _vd.last_child = &ps->first_child;
    00722
    00723   if (_vd.combine_sprites == SPRITE_COMBINE_PENDING) _vd.combine_sprites = SPRITE_COMBINE_ACTIVE;
    00724 }
    00725
    00744 void StartSpriteCombine()
    00745 {
    00746   assert(_vd.combine_sprites == SPRITE_COMBINE_NONE);
    00747   _vd.combine_sprites = SPRITE_COMBINE_PENDING;
    00748 }
    00749
    00754 void EndSpriteCombine()
    00755 {
    00756   assert(_vd.combine_sprites != SPRITE_COMBINE_NONE);
    00757   _vd.combine_sprites = SPRITE_COMBINE_NONE;
    00758 }
    00759
    00769 static bool IsInRangeInclusive(int begin, int end, int check)
    00770 {
    00771   if (begin > end) Swap(begin, end);
    00772   return begin <= check && check <= end;
    00773 }
    00774
    00781 bool IsInsideRotatedRectangle(int x, int y)
    00782 {
    00783   int dist_a = (_thd.size.x + _thd.size.y);      // Rotated coordinate system for selected rectangle.
    00784   int dist_b = (_thd.size.x - _thd.size.y);      // We don't have to divide by 2. It's all relative!
    00785   int a = ((x - _thd.pos.x) + (y - _thd.pos.y)); // Rotated coordinate system for the point under scrutiny.
    00786   int b = ((x - _thd.pos.x) - (y - _thd.pos.y));
    00787
    00788   /* Check if a and b are between 0 and dist_a or dist_b respectively. */
    00789   return IsInRangeInclusive(dist_a, 0, a) && IsInRangeInclusive(dist_b, 0, b);
    00790 }
    00791
    00802 void AddChildSpriteScreen(SpriteID image, PaletteID pal, int x, int y, bool transparent, const SubSprite *sub, bool scale)
    00803 {
    00804   assert((image & SPRITE_MASK) < MAX_SPRITES);
    00805
    00806   /* If the ParentSprite was clipped by the viewport bounds, do not draw the ChildSprites either */
    00807   if (_vd.last_child == NULL) return;
    00808
    00809   /* make the sprites transparent with the right palette */
    00810   if (transparent) {
    00811     SetBit(image, PALETTE_MODIFIER_TRANSPARENT);
    00812     pal = PALETTE_TO_TRANSPARENT;
    00813   }
    00814
    00815   *_vd.last_child = _vd.child_screen_sprites_to_draw.Length();
    00816
    00817   ChildScreenSpriteToDraw *cs = _vd.child_screen_sprites_to_draw.Append();
    00818   cs->image = image;
    00819   cs->pal = pal;
    00820   cs->sub = sub;
    00821   cs->x = scale ? x * ZOOM_LVL_BASE : x;
    00822   cs->y = scale ? y * ZOOM_LVL_BASE : y;
    00823   cs->next = -1;
    00824
    00825   /* Append the sprite to the active ChildSprite list.
    00826    * If the active ParentSprite is a foundation, update last_foundation_child as well.
    00827    * Note: ChildSprites of foundations are NOT sequential in the vector, as selection sprites are added at last. */
    00828   if (_vd.last_foundation_child[0] == _vd.last_child) _vd.last_foundation_child[0] = &cs->next;
    00829   if (_vd.last_foundation_child[1] == _vd.last_child) _vd.last_foundation_child[1] = &cs->next;
    00830   _vd.last_child = &cs->next;
    00831 }
    00832
    00833 static void AddStringToDraw(int x, int y, StringID string, uint64 params_1, uint64 params_2, Colours colour, uint16 width)
    00834 {
    00835   assert(width != 0);
    00836   StringSpriteToDraw *ss = _vd.string_sprites_to_draw.Append();
    00837   ss->string = string;
    00838   ss->x = x;
    00839   ss->y = y;
    00840   ss->params[0] = params_1;
    00841   ss->params[1] = params_2;
    00842   ss->width = width;
    00843   ss->colour = colour;
    00844 }
    00845
    00846
    00858 static void DrawSelectionSprite(SpriteID image, PaletteID pal, const TileInfo *ti, int z_offset, FoundationPart foundation_part)
    00859 {
    00860   /* FIXME: This is not totally valid for some autorail highlights that extend over the edges of the tile. */
    00861   if (_vd.foundation[foundation_part] == -1) {
    00862     /* draw on real ground */
    00863     AddTileSpriteToDraw(image, pal, ti->x, ti->y, ti->z + z_offset);
    00864   } else {
    00865     /* draw on top of foundation */
    00866     AddChildSpriteToFoundation(image, pal, NULL, foundation_part, 0, -z_offset * ZOOM_LVL_BASE);
    00867   }
    00868 }
    00869
    00876 static void DrawTileSelectionRect(const TileInfo *ti, PaletteID pal)
    00877 {
    00878   if (!IsValidTile(ti->tile)) return;
    00879
    00880   SpriteID sel;
    00881   if (IsHalftileSlope(ti->tileh)) {
    00882     Corner halftile_corner = GetHalftileSlopeCorner(ti->tileh);
    00883     SpriteID sel2 = SPR_HALFTILE_SELECTION_FLAT + halftile_corner;
    00884     DrawSelectionSprite(sel2, pal, ti, 7 + TILE_HEIGHT, FOUNDATION_PART_HALFTILE);
    00885
    00886     Corner opposite_corner = OppositeCorner(halftile_corner);
    00887     if (IsSteepSlope(ti->tileh)) {
    00888       sel = SPR_HALFTILE_SELECTION_DOWN;
    00889     } else {
    00890       sel = ((ti->tileh & SlopeWithOneCornerRaised(opposite_corner)) != 0 ? SPR_HALFTILE_SELECTION_UP : SPR_HALFTILE_SELECTION_FLAT);
    00891     }
    00892     sel += opposite_corner;
    00893   } else {
    00894     sel = SPR_SELECT_TILE + SlopeToSpriteOffset(ti->tileh);
    00895   }
    00896   DrawSelectionSprite(sel, pal, ti, 7, FOUNDATION_PART_NORMAL);
    00897 }
    00898
    00899 static bool IsPartOfAutoLine(int px, int py)
    00900 {
    00901   px -= _thd.selstart.x;
    00902   py -= _thd.selstart.y;
    00903
    00904   if ((_thd.drawstyle & HT_DRAG_MASK) != HT_LINE) return false;
    00905
    00906   switch (_thd.drawstyle & HT_DIR_MASK) {
    00907     case HT_DIR_X:  return py == 0; // x direction
    00908     case HT_DIR_Y:  return px == 0; // y direction
    00909     case HT_DIR_HU: return px == -py || px == -py - 16; // horizontal upper
    00910     case HT_DIR_HL: return px == -py || px == -py + 16; // horizontal lower
    00911     case HT_DIR_VL: return px == py || px == py + 16; // vertical left
    00912     case HT_DIR_VR: return px == py || px == py - 16; // vertical right
    00913     default:
    00914       NOT_REACHED();
    00915   }
    00916 }
    00917
    00918 /* [direction][side] */
    00919 static const HighLightStyle _autorail_type[6][2] = {
    00920   { HT_DIR_X,  HT_DIR_X },
    00921   { HT_DIR_Y,  HT_DIR_Y },
    00922   { HT_DIR_HU, HT_DIR_HL },
    00923   { HT_DIR_HL, HT_DIR_HU },
    00924   { HT_DIR_VL, HT_DIR_VR },
    00925   { HT_DIR_VR, HT_DIR_VL }
    00926 };
    00927
    00928 #include "table/autorail.h"
    00929
    00936 static void DrawAutorailSelection(const TileInfo *ti, uint autorail_type)
    00937 {
    00938   SpriteID image;
    00939   PaletteID pal;
    00940   int offset;
    00941
    00942   FoundationPart foundation_part = FOUNDATION_PART_NORMAL;
    00943   Slope autorail_tileh = RemoveHalftileSlope(ti->tileh);
    00944   if (IsHalftileSlope(ti->tileh)) {
    00945     static const uint _lower_rail[4] = { 5U, 2U, 4U, 3U };
    00946     Corner halftile_corner = GetHalftileSlopeCorner(ti->tileh);
    00947     if (autorail_type != _lower_rail[halftile_corner]) {
    00948       foundation_part = FOUNDATION_PART_HALFTILE;
    00949       /* Here we draw the highlights of the "three-corners-raised"-slope. That looks ok to me. */
    00950       autorail_tileh = SlopeWithThreeCornersRaised(OppositeCorner(halftile_corner));
    00951     }
    00952   }
    00953
    00954   offset = _AutorailTilehSprite[autorail_tileh][autorail_type];
    00955   if (offset >= 0) {
    00956     image = SPR_AUTORAIL_BASE + offset;
    00957     pal = PAL_NONE;
    00958   } else {
    00959     image = SPR_AUTORAIL_BASE - offset;
    00960     pal = PALETTE_SEL_TILE_RED;
    00961   }
    00962
    00963   DrawSelectionSprite(image, _thd.make_square_red ? PALETTE_SEL_TILE_RED : pal, ti, 7, foundation_part);
    00964 }
    00965
    00970 static void DrawTileSelection(const TileInfo *ti)
    00971 {
    00972   /* Draw a red error square? */
    00973   bool is_redsq = _thd.redsq == ti->tile;
    00974   if (is_redsq) DrawTileSelectionRect(ti, PALETTE_TILE_RED_PULSATING);
    00975
    00976   /* No tile selection active? */
    00977   if ((_thd.drawstyle & HT_DRAG_MASK) == HT_NONE) return;
    00978
    00979   if (_thd.diagonal) { // We're drawing a 45 degrees rotated (diagonal) rectangle
    00980     if (IsInsideRotatedRectangle((int)ti->x, (int)ti->y)) goto draw_inner;
    00981     return;
    00982   }
    00983
    00984   /* Inside the inner area? */
    00985   if (IsInsideBS(ti->x, _thd.pos.x, _thd.size.x) &&
    00986       IsInsideBS(ti->y, _thd.pos.y, _thd.size.y)) {
    00987 draw_inner:
    00988     if (_thd.drawstyle & HT_RECT) {
    00989       if (!is_redsq) DrawTileSelectionRect(ti, _thd.make_square_red ? PALETTE_SEL_TILE_RED : PAL_NONE);
    00990     } else if (_thd.drawstyle & HT_POINT) {
    00991       /* Figure out the Z coordinate for the single dot. */
    00992       int z = 0;
    00993       FoundationPart foundation_part = FOUNDATION_PART_NORMAL;
    00994       if (ti->tileh & SLOPE_N) {
    00995         z += TILE_HEIGHT;
    00996         if (RemoveHalftileSlope(ti->tileh) == SLOPE_STEEP_N) z += TILE_HEIGHT;
    00997       }
    00998       if (IsHalftileSlope(ti->tileh)) {
    00999         Corner halftile_corner = GetHalftileSlopeCorner(ti->tileh);
    01000         if ((halftile_corner == CORNER_W) || (halftile_corner == CORNER_E)) z += TILE_HEIGHT;
    01001         if (halftile_corner != CORNER_S) {
    01002           foundation_part = FOUNDATION_PART_HALFTILE;
    01003           if (IsSteepSlope(ti->tileh)) z -= TILE_HEIGHT;
    01004         }
    01005       }
    01006       DrawSelectionSprite(_cur_dpi->zoom <= ZOOM_LVL_DETAIL ? SPR_DOT : SPR_DOT_SMALL, PAL_NONE, ti, z, foundation_part);
    01007     } else if (_thd.drawstyle & HT_RAIL) {
    01008       /* autorail highlight piece under cursor */
    01009       HighLightStyle type = _thd.drawstyle & HT_DIR_MASK;
    01010       assert(type < HT_DIR_END);
    01011       DrawAutorailSelection(ti, _autorail_type[type][0]);
    01012     } else if (IsPartOfAutoLine(ti->x, ti->y)) {
    01013       /* autorail highlighting long line */
    01014       HighLightStyle dir = _thd.drawstyle & HT_DIR_MASK;
    01015       uint side;
    01016
    01017       if (dir == HT_DIR_X || dir == HT_DIR_Y) {
    01018         side = 0;
    01019       } else {
    01020         TileIndex start = TileVirtXY(_thd.selstart.x, _thd.selstart.y);
    01021         side = Delta(Delta(TileX(start), TileX(ti->tile)), Delta(TileY(start), TileY(ti->tile)));
    01022       }
    01023
    01024       DrawAutorailSelection(ti, _autorail_type[dir][side]);
    01025     }
    01026     return;
    01027   }
    01028
    01029   /* Check if it's inside the outer area? */
    01030   if (!is_redsq && _thd.outersize.x > 0 &&
    01031       IsInsideBS(ti->x, _thd.pos.x + _thd.offs.x, _thd.size.x + _thd.outersize.x) &&
    01032       IsInsideBS(ti->y, _thd.pos.y + _thd.offs.y, _thd.size.y + _thd.outersize.y)) {
    01033     /* Draw a blue rect. */
    01034     DrawTileSelectionRect(ti, PALETTE_SEL_TILE_BLUE);
    01035     return;
    01036   }
    01037 }
    01038
    01039 static void ViewportAddLandscape()
    01040 {
    01041   int x, y, width, height;
    01042   TileInfo ti;
    01043   bool direction;
    01044
    01045   _cur_ti = &ti;
    01046
    01047   /* Transform into tile coordinates and round to closest full tile */
    01048   x = ((_vd.dpi.top >> (1 + ZOOM_LVL_SHIFT)) - (_vd.dpi.left >> (2 + ZOOM_LVL_SHIFT))) & ~TILE_UNIT_MASK;
    01049   y = ((_vd.dpi.top >> (1 + ZOOM_LVL_SHIFT)) + (_vd.dpi.left >> (2 + ZOOM_LVL_SHIFT)) - TILE_SIZE) & ~TILE_UNIT_MASK;
    01050
    01051   /* determine size of area */
    01052   {
    01053     Point pt = RemapCoords(x, y, 241);
    01054     width = (_vd.dpi.left + _vd.dpi.width - pt.x + 96 * ZOOM_LVL_BASE - 1) >> (6 + ZOOM_LVL_SHIFT);
    01055     height = (_vd.dpi.top + _vd.dpi.height - pt.y) >> (5 + ZOOM_LVL_SHIFT) << 1;
    01056   }
    01057
    01058   assert(width > 0);
    01059   assert(height > 0);
    01060
    01061   direction = false;
    01062
    01063   do {
    01064     int width_cur = width;
    01065     uint x_cur = x;
    01066     uint y_cur = y;
    01067
    01068     do {
    01069       TileType tt = MP_VOID;
    01070
    01071       ti.x = x_cur;
    01072       ti.y = y_cur;
    01073
    01074       ti.z = 0;
    01075
    01076       ti.tileh = SLOPE_FLAT;
    01077       ti.tile = INVALID_TILE;
    01078
    01079       if (x_cur < MapMaxX() * TILE_SIZE &&
    01080           y_cur < MapMaxY() * TILE_SIZE) {
    01081         TileIndex tile = TileVirtXY(x_cur, y_cur);
    01082
    01083         if (!_settings_game.construction.freeform_edges || (TileX(tile) != 0 && TileY(tile) != 0)) {
    01084           if (x_cur == ((int)MapMaxX() - 1) * TILE_SIZE || y_cur == ((int)MapMaxY() - 1) * TILE_SIZE) {
    01085             uint maxh = max<uint>(TileHeight(tile), 1);
    01086             for (uint h = 0; h < maxh; h++) {
    01087               AddTileSpriteToDraw(SPR_SHADOW_CELL, PAL_NONE, ti.x, ti.y, h * TILE_HEIGHT);
    01088             }
    01089           }
    01090
    01091           ti.tile = tile;
    01092           ti.tileh = GetTilePixelSlope(tile, &ti.z);
    01093           tt = GetTileType(tile);
    01094         }
    01095       }
    01096
    01097       _vd.foundation_part = FOUNDATION_PART_NONE;
    01098       _vd.foundation[0] = -1;
    01099       _vd.foundation[1] = -1;
    01100       _vd.last_foundation_child[0] = NULL;
    01101       _vd.last_foundation_child[1] = NULL;
    01102
    01103       _tile_type_procs[tt]->draw_tile_proc(&ti);
    01104
    01105       if ((x_cur == (int)MapMaxX() * TILE_SIZE && IsInsideMM(y_cur, 0, MapMaxY() * TILE_SIZE + 1)) ||
    01106           (y_cur == (int)MapMaxY() * TILE_SIZE && IsInsideMM(x_cur, 0, MapMaxX() * TILE_SIZE + 1))) {
    01107         TileIndex tile = TileVirtXY(x_cur, y_cur);
    01108         ti.tile = tile;
    01109         ti.tileh = GetTilePixelSlope(tile, &ti.z);
    01110         tt = GetTileType(tile);
    01111       }
    01112       if (ti.tile != INVALID_TILE) DrawTileSelection(&ti);
    01113
    01114       y_cur += 0x10;
    01115       x_cur -= 0x10;
    01116     } while (--width_cur);
    01117
    01118     if ((direction ^= 1) != 0) {
    01119       y += 0x10;
    01120     } else {
    01121       x += 0x10;
    01122     }
    01123   } while (--height);
    01124 }
    01125
    01136 void ViewportAddString(const DrawPixelInfo *dpi, ZoomLevel small_from, const ViewportSign *sign, StringID string_normal, StringID string_small, StringID string_small_shadow, uint64 params_1, uint64 params_2, Colours colour)
    01137 {
    01138   bool small = dpi->zoom >= small_from;
    01139
    01140   int left   = dpi->left;
    01141   int top    = dpi->top;
    01142   int right  = left + dpi->width;
    01143   int bottom = top + dpi->height;
    01144
    01145   int sign_height     = ScaleByZoom(VPSM_TOP + FONT_HEIGHT_NORMAL + VPSM_BOTTOM, dpi->zoom);
    01146   int sign_half_width = ScaleByZoom((small ? sign->width_small : sign->width_normal) / 2, dpi->zoom);
    01147
    01148   if (bottom < sign->top ||
    01149       top   > sign->top + sign_height ||
    01150       right < sign->center - sign_half_width ||
    01151       left  > sign->center + sign_half_width) {
    01152     return;
    01153   }
    01154
    01155   if (!small) {
    01156     AddStringToDraw(sign->center - sign_half_width, sign->top, string_normal, params_1, params_2, colour, sign->width_normal);
    01157   } else {
    01158     int shadow_offset = 0;
    01159     if (string_small_shadow != STR_NULL) {
    01160       shadow_offset = 4;
    01161       AddStringToDraw(sign->center - sign_half_width + shadow_offset, sign->top, string_small_shadow, params_1, params_2, INVALID_COLOUR, sign->width_small);
    01162     }
    01163     AddStringToDraw(sign->center - sign_half_width, sign->top - shadow_offset, string_small, params_1, params_2,
    01164         colour, sign->width_small | 0x8000);
    01165   }
    01166 }
    01167
    01168 static void ViewportAddTownNames(DrawPixelInfo *dpi)
    01169 {
    01170   if (!HasBit(_display_opt, DO_SHOW_TOWN_NAMES) || _game_mode == GM_MENU) return;
    01171
    01172   const Town *t;
    01173   FOR_ALL_TOWNS(t) {
    01174     ViewportAddString(dpi, ZOOM_LVL_OUT_16X, &t->cache.sign,
    01175         _settings_client.gui.population_in_label ? STR_VIEWPORT_TOWN_POP : STR_VIEWPORT_TOWN,
    01176         STR_VIEWPORT_TOWN_TINY_WHITE, STR_VIEWPORT_TOWN_TINY_BLACK,
    01177         t->index, t->cache.population);
    01178   }
    01179 }
    01180
    01181
    01182 static void ViewportAddStationNames(DrawPixelInfo *dpi)
    01183 {
    01184   if (!(HasBit(_display_opt, DO_SHOW_STATION_NAMES) || HasBit(_display_opt, DO_SHOW_WAYPOINT_NAMES)) || _game_mode == GM_MENU) return;
    01185
    01186   const BaseStation *st;
    01187   FOR_ALL_BASE_STATIONS(st) {
    01188     /* Check whether the base station is a station or a waypoint */
    01189     bool is_station = Station::IsExpected(st);
    01190
    01191     /* Don't draw if the display options are disabled */
    01192     if (!HasBit(_display_opt, is_station ? DO_SHOW_STATION_NAMES : DO_SHOW_WAYPOINT_NAMES)) continue;
    01193
    01194     /* Don't draw if station is owned by another company and competitor station names are hidden. Stations owned by none are never ignored. */
    01195     if (!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS) && _local_company != st->owner && st->owner != OWNER_NONE) continue;
    01196
    01197     ViewportAddString(dpi, ZOOM_LVL_OUT_16X, &st->sign,
    01198         is_station ? STR_VIEWPORT_STATION : STR_VIEWPORT_WAYPOINT,
    01199         (is_station ? STR_VIEWPORT_STATION : STR_VIEWPORT_WAYPOINT) + 1, STR_NULL,
    01200         st->index, st->facilities, (st->owner == OWNER_NONE || !st->IsInUse()) ? COLOUR_GREY : _company_colours[st->owner]);
    01201   }
    01202 }
    01203
    01204
    01205 static void ViewportAddSigns(DrawPixelInfo *dpi)
    01206 {
    01207   /* Signs are turned off or are invisible */
    01208   if (!HasBit(_display_opt, DO_SHOW_SIGNS) || IsInvisibilitySet(TO_SIGNS)) return;
    01209
    01210   const Sign *si;
    01211   FOR_ALL_SIGNS(si) {
    01212     /* Don't draw if sign is owned by another company and competitor signs should be hidden.
    01213      * Note: It is intentional that also signs owned by OWNER_NONE are hidden. Bankrupt
    01214      * companies can leave OWNER_NONE signs after them. */
    01215     if (!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS) && _local_company != si->owner && si->owner != OWNER_DEITY) continue;
    01216
    01217     ViewportAddString(dpi, ZOOM_LVL_OUT_16X, &si->sign,
    01218         STR_WHITE_SIGN,
    01219         (IsTransparencySet(TO_SIGNS) || si->owner == OWNER_DEITY) ? STR_VIEWPORT_SIGN_SMALL_WHITE : STR_VIEWPORT_SIGN_SMALL_BLACK, STR_NULL,
    01220         si->index, 0, (si->owner == OWNER_NONE) ? COLOUR_GREY : (si->owner == OWNER_DEITY ? INVALID_COLOUR : _company_colours[si->owner]));
    01221   }
    01222 }
    01223
    01230 void ViewportSign::UpdatePosition(int center, int top, StringID str)
    01231 {
    01232   if (this->width_normal != 0) this->MarkDirty();
    01233
    01234   this->top = top;
    01235
    01236   char buffer[DRAW_STRING_BUFFER];
    01237
    01238   GetString(buffer, str, lastof(buffer));
    01239   this->width_normal = VPSM_LEFT + Align(GetStringBoundingBox(buffer).width, 2) + VPSM_RIGHT;
    01240   this->center = center;
    01241
    01242   /* zoomed out version */
    01243   this->width_small = VPSM_LEFT + Align(GetStringBoundingBox(buffer, FS_SMALL).width, 2) + VPSM_RIGHT;
    01244
    01245   this->MarkDirty();
    01246 }
    01247
    01254 void ViewportSign::MarkDirty(ZoomLevel maxzoom) const
    01255 {
    01256   Rect zoomlevels[ZOOM_LVL_COUNT];
    01257
    01258   for (ZoomLevel zoom = ZOOM_LVL_BEGIN; zoom != ZOOM_LVL_END; zoom++) {
    01259     /* FIXME: This doesn't switch to width_small when appropriate. */
    01260     zoomlevels[zoom].left   = this->center - ScaleByZoom(this->width_normal / 2 + 1, zoom);
    01261     zoomlevels[zoom].top    = this->top    - ScaleByZoom(1, zoom);
    01262     zoomlevels[zoom].right  = this->center + ScaleByZoom(this->width_normal / 2 + 1, zoom);
    01263     zoomlevels[zoom].bottom = this->top    + ScaleByZoom(VPSM_TOP + FONT_HEIGHT_NORMAL + VPSM_BOTTOM + 1, zoom);
    01264   }
    01265
    01266   Window *w;
    01267   FOR_ALL_WINDOWS_FROM_BACK(w) {
    01268     ViewPort *vp = w->viewport;
    01269     if (vp != NULL && vp->zoom <= maxzoom) {
    01270       assert(vp->width != 0);
    01271       Rect &zl = zoomlevels[vp->zoom];
    01272       MarkViewportDirty(vp, zl.left, zl.top, zl.right, zl.bottom);
    01273     }
    01274   }
    01275 }
    01276
    01277 static void ViewportDrawTileSprites(const TileSpriteToDrawVector *tstdv)
    01278 {
    01279   const TileSpriteToDraw *tsend = tstdv->End();
    01280   for (const TileSpriteToDraw *ts = tstdv->Begin(); ts != tsend; ++ts) {
    01281     DrawSpriteViewport(ts->image, ts->pal, ts->x, ts->y, ts->sub);
    01282   }
    01283 }
    01284
    01286 static void ViewportSortParentSprites(ParentSpriteToSortVector *psdv)
    01287 {
    01288   ParentSpriteToDraw **psdvend = psdv->End();
    01289   ParentSpriteToDraw **psd = psdv->Begin();
    01290   while (psd != psdvend) {
    01291     ParentSpriteToDraw *ps = *psd;
    01292
    01293     if (ps->comparison_done) {
    01294       psd++;
    01295       continue;
    01296     }
    01297
    01298     ps->comparison_done = true;
    01299
    01300     for (ParentSpriteToDraw **psd2 = psd + 1; psd2 != psdvend; psd2++) {
    01301       ParentSpriteToDraw *ps2 = *psd2;
    01302
    01303       if (ps2->comparison_done) continue;
    01304
    01305       /* Decide which comparator to use, based on whether the bounding
    01306        * boxes overlap
    01307        */
    01308       if (ps->xmax >= ps2->xmin && ps->xmin <= ps2->xmax && // overlap in X?
    01309           ps->ymax >= ps2->ymin && ps->ymin <= ps2->ymax && // overlap in Y?
    01310           ps->zmax >= ps2->zmin && ps->zmin <= ps2->zmax) { // overlap in Z?
    01311         /* Use X+Y+Z as the sorting order, so sprites closer to the bottom of
    01312          * the screen and with higher Z elevation, are drawn in front.
    01313          * Here X,Y,Z are the coordinates of the "center of mass" of the sprite,
    01314          * i.e. X=(left+right)/2, etc.
    01315          * However, since we only care about order, don't actually divide / 2
    01316          */
    01317         if (ps->xmin + ps->xmax + ps->ymin + ps->ymax + ps->zmin + ps->zmax <=
    01318             ps2->xmin + ps2->xmax + ps2->ymin + ps2->ymax + ps2->zmin + ps2->zmax) {
    01319           continue;
    01320         }
    01321       } else {
    01322         /* We only change the order, if it is definite.
    01323          * I.e. every single order of X, Y, Z says ps2 is behind ps or they overlap.
    01324          * That is: If one partial order says ps behind ps2, do not change the order.
    01325          */
    01326         if (ps->xmax < ps2->xmin ||
    01327             ps->ymax < ps2->ymin ||
    01328             ps->zmax < ps2->zmin) {
    01329           continue;
    01330         }
    01331       }
    01332
    01333       /* Move ps2 in front of ps */
    01334       ParentSpriteToDraw *temp = ps2;
    01335       for (ParentSpriteToDraw **psd3 = psd2; psd3 > psd; psd3--) {
    01336         *psd3 = *(psd3 - 1);
    01337       }
    01338       *psd = temp;
    01339     }
    01340   }
    01341 }
    01342
    01343 static void ViewportDrawParentSprites(const ParentSpriteToSortVector *psd, const ChildScreenSpriteToDrawVector *csstdv)
    01344 {
    01345   const ParentSpriteToDraw * const *psd_end = psd->End();
    01346   for (const ParentSpriteToDraw * const *it = psd->Begin(); it != psd_end; it++) {
    01347     const ParentSpriteToDraw *ps = *it;
    01348     if (ps->image != SPR_EMPTY_BOUNDING_BOX) DrawSpriteViewport(ps->image, ps->pal, ps->x, ps->y, ps->sub);
    01349
    01350     int child_idx = ps->first_child;
    01351     while (child_idx >= 0) {
    01352       const ChildScreenSpriteToDraw *cs = csstdv->Get(child_idx);
    01353       child_idx = cs->next;
    01354       DrawSpriteViewport(cs->image, cs->pal, ps->left + cs->x, ps->top + cs->y, cs->sub);
    01355     }
    01356   }
    01357 }
    01358
    01363 static void ViewportDrawBoundingBoxes(const ParentSpriteToSortVector *psd)
    01364 {
    01365   const ParentSpriteToDraw * const *psd_end = psd->End();
    01366   for (const ParentSpriteToDraw * const *it = psd->Begin(); it != psd_end; it++) {
    01367     const ParentSpriteToDraw *ps = *it;
    01368     Point pt1 = RemapCoords(ps->xmax + 1, ps->ymax + 1, ps->zmax + 1); // top front corner
    01369     Point pt2 = RemapCoords(ps->xmin    , ps->ymax + 1, ps->zmax + 1); // top left corner
    01370     Point pt3 = RemapCoords(ps->xmax + 1, ps->ymin    , ps->zmax + 1); // top right corner
    01371     Point pt4 = RemapCoords(ps->xmax + 1, ps->ymax + 1, ps->zmin    ); // bottom front corner
    01372
    01373     DrawBox(        pt1.x,         pt1.y,
    01374             pt2.x - pt1.x, pt2.y - pt1.y,
    01375             pt3.x - pt1.x, pt3.y - pt1.y,
    01376             pt4.x - pt1.x, pt4.y - pt1.y);
    01377   }
    01378 }
    01379
    01383 static void ViewportDrawDirtyBlocks()
    01384 {
    01385   Blitter *blitter = BlitterFactoryBase::GetCurrentBlitter();
    01386   const DrawPixelInfo *dpi = _cur_dpi;
    01387   void *dst;
    01388   int right =  UnScaleByZoom(dpi->width,  dpi->zoom);
    01389   int bottom = UnScaleByZoom(dpi->height, dpi->zoom);
    01390
    01391   int colour = _string_colourmap[_dirty_block_colour & 0xF];
    01392
    01393   dst = dpi->dst_ptr;
    01394
    01395   byte bo = UnScaleByZoom(dpi->left + dpi->top, dpi->zoom) & 1;
    01396   do {
    01397     for (int i = (bo ^= 1); i < right; i += 2) blitter->SetPixel(dst, i, 0, (uint8)colour);
    01398     dst = blitter->MoveTo(dst, 0, 1);
    01399   } while (--bottom > 0);
    01400 }
    01401
    01402 static void ViewportDrawStrings(DrawPixelInfo *dpi, const StringSpriteToDrawVector *sstdv)
    01403 {
    01404   DrawPixelInfo dp;
    01405   ZoomLevel zoom;
    01406
    01407   _cur_dpi = &dp;
    01408   dp = *dpi;
    01409
    01410   zoom = dp.zoom;
    01411   dp.zoom = ZOOM_LVL_NORMAL;
    01412
    01413   dp.left   = UnScaleByZoom(dp.left,   zoom);
    01414   dp.top    = UnScaleByZoom(dp.top,    zoom);
    01415   dp.width  = UnScaleByZoom(dp.width,  zoom);
    01416   dp.height = UnScaleByZoom(dp.height, zoom);
    01417
    01418   const StringSpriteToDraw *ssend = sstdv->End();
    01419   for (const StringSpriteToDraw *ss = sstdv->Begin(); ss != ssend; ++ss) {
    01420     TextColour colour = TC_BLACK;
    01421     bool small = HasBit(ss->width, 15);
    01422     int w = GB(ss->width, 0, 15);
    01423     int x = UnScaleByZoom(ss->x, zoom);
    01424     int y = UnScaleByZoom(ss->y, zoom);
    01425     int h = VPSM_TOP + (small ? FONT_HEIGHT_SMALL : FONT_HEIGHT_NORMAL) + VPSM_BOTTOM;
    01426
    01427     SetDParam(0, ss->params[0]);
    01428     SetDParam(1, ss->params[1]);
    01429
    01430     if (ss->colour != INVALID_COLOUR) {
    01431       /* Do not draw signs nor station names if they are set invisible */
    01432       if (IsInvisibilitySet(TO_SIGNS) && ss->string != STR_WHITE_SIGN) continue;
    01433
    01434       /* if we didn't draw a rectangle, or if transperant building is on,
    01435        * draw the text in the colour the rectangle would have */
    01436       if (IsTransparencySet(TO_SIGNS) && ss->string != STR_WHITE_SIGN) {
    01437         /* Real colours need the TC_IS_PALETTE_COLOUR flag
    01438          * otherwise colours from _string_colourmap are assumed. */
    01439         colour = (TextColour)_colour_gradient[ss->colour][6] | TC_IS_PALETTE_COLOUR;
    01440       }
    01441
    01442       /* Draw the rectangle if 'transparent station signs' is off,
    01443        * or if we are drawing a general text sign (STR_WHITE_SIGN) */
    01444       if (!IsTransparencySet(TO_SIGNS) || ss->string == STR_WHITE_SIGN) {
    01445         DrawFrameRect(
    01446           x, y, x + w, y + h, ss->colour,
    01447           IsTransparencySet(TO_SIGNS) ? FR_TRANSPARENT : FR_NONE
    01448         );
    01449       }
    01450     }
    01451
    01452     DrawString(x + VPSM_LEFT, x + w - 1 - VPSM_RIGHT, y + VPSM_TOP, ss->string, colour, SA_HOR_CENTER);
    01453   }
    01454 }
    01455
    01456 void ViewportDoDraw(const ViewPort *vp, int left, int top, int right, int bottom)
    01457 {
    01458   DrawPixelInfo *old_dpi = _cur_dpi;
    01459   _cur_dpi = &_vd.dpi;
    01460
    01461   _vd.dpi.zoom = vp->zoom;
    01462   int mask = ScaleByZoom(-1, vp->zoom);
    01463
    01464   _vd.combine_sprites = SPRITE_COMBINE_NONE;
    01465
    01466   _vd.dpi.width = (right - left) & mask;
    01467   _vd.dpi.height = (bottom - top) & mask;
    01468   _vd.dpi.left = left & mask;
    01469   _vd.dpi.top = top & mask;
    01470   _vd.dpi.pitch = old_dpi->pitch;
    01471   _vd.last_child = NULL;
    01472
    01473   int x = UnScaleByZoom(_vd.dpi.left - (vp->virtual_left & mask), vp->zoom) + vp->left;
    01474   int y = UnScaleByZoom(_vd.dpi.top - (vp->virtual_top & mask), vp->zoom) + vp->top;
    01475
    01476   _vd.dpi.dst_ptr = BlitterFactoryBase::GetCurrentBlitter()->MoveTo(old_dpi->dst_ptr, x - old_dpi->left, y - old_dpi->top);
    01477
    01478   ViewportAddLandscape();
    01479   ViewportAddVehicles(&_vd.dpi);
    01480
    01481   ViewportAddTownNames(&_vd.dpi);
    01482   ViewportAddStationNames(&_vd.dpi);
    01483   ViewportAddSigns(&_vd.dpi);
    01484
    01485   DrawTextEffects(&_vd.dpi);
    01486
    01487   if (_vd.tile_sprites_to_draw.Length() != 0) ViewportDrawTileSprites(&_vd.tile_sprites_to_draw);
    01488
    01489   ParentSpriteToDraw *psd_end = _vd.parent_sprites_to_draw.End();
    01490   for (ParentSpriteToDraw *it = _vd.parent_sprites_to_draw.Begin(); it != psd_end; it++) {
    01491     *_vd.parent_sprites_to_sort.Append() = it;
    01492   }
    01493
    01494   ViewportSortParentSprites(&_vd.parent_sprites_to_sort);
    01495   ViewportDrawParentSprites(&_vd.parent_sprites_to_sort, &_vd.child_screen_sprites_to_draw);
    01496
    01497   if (_draw_bounding_boxes) ViewportDrawBoundingBoxes(&_vd.parent_sprites_to_sort);
    01498   if (_draw_dirty_blocks) ViewportDrawDirtyBlocks();
    01499
    01500   if (_vd.string_sprites_to_draw.Length() != 0) ViewportDrawStrings(&_vd.dpi, &_vd.string_sprites_to_draw);
    01501
    01502   _cur_dpi = old_dpi;
    01503
    01504   _vd.string_sprites_to_draw.Clear();
    01505   _vd.tile_sprites_to_draw.Clear();
    01506   _vd.parent_sprites_to_draw.Clear();
    01507   _vd.parent_sprites_to_sort.Clear();
    01508   _vd.child_screen_sprites_to_draw.Clear();
    01509 }
    01510
    01515 static void ViewportDrawChk(const ViewPort *vp, int left, int top, int right, int bottom)
    01516 {
    01517   if (ScaleByZoom(bottom - top, vp->zoom) * ScaleByZoom(right - left, vp->zoom) > 180000 * ZOOM_LVL_BASE * ZOOM_LVL_BASE) {
    01518     if ((bottom - top) > (right - left)) {
    01519       int t = (top + bottom) >> 1;
    01520       ViewportDrawChk(vp, left, top, right, t);
    01521       ViewportDrawChk(vp, left, t, right, bottom);
    01522     } else {
    01523       int t = (left + right) >> 1;
    01524       ViewportDrawChk(vp, left, top, t, bottom);
    01525       ViewportDrawChk(vp, t, top, right, bottom);
    01526     }
    01527   } else {
    01528     ViewportDoDraw(vp,
    01529       ScaleByZoom(left - vp->left, vp->zoom) + vp->virtual_left,
    01530       ScaleByZoom(top - vp->top, vp->zoom) + vp->virtual_top,
    01531       ScaleByZoom(right - vp->left, vp->zoom) + vp->virtual_left,
    01532       ScaleByZoom(bottom - vp->top, vp->zoom) + vp->virtual_top
    01533     );
    01534   }
    01535 }
    01536
    01537 static inline void ViewportDraw(const ViewPort *vp, int left, int top, int right, int bottom)
    01538 {
    01539   if (right <= vp->left || bottom <= vp->top) return;
    01540
    01541   if (left >= vp->left + vp->width) return;
    01542
    01543   if (left < vp->left) left = vp->left;
    01544   if (right > vp->left + vp->width) right = vp->left + vp->width;
    01545
    01546   if (top >= vp->top + vp->height) return;
    01547
    01548   if (top < vp->top) top = vp->top;
    01549   if (bottom > vp->top + vp->height) bottom = vp->top + vp->height;
    01550
    01551   ViewportDrawChk(vp, left, top, right, bottom);
    01552 }
    01553
    01557 void Window::DrawViewport() const
    01558 {
    01559   DrawPixelInfo *dpi = _cur_dpi;
    01560
    01561   dpi->left += this->left;
    01562   dpi->top += this->top;
    01563
    01564   ViewportDraw(this->viewport, dpi->left, dpi->top, dpi->left + dpi->width, dpi->top + dpi->height);
    01565
    01566   dpi->left -= this->left;
    01567   dpi->top -= this->top;
    01568 }
    01569
    01570 static inline void ClampViewportToMap(const ViewPort *vp, int &x, int &y)
    01571 {
    01572   /* Centre of the viewport is hot spot */
    01573   x += vp->virtual_width / 2;
    01574   y += vp->virtual_height / 2;
    01575
    01576   /* Convert viewport coordinates to map coordinates
    01577    * Calculation is scaled by 4 to avoid rounding errors */
    01578   int vx = -x + y * 2;
    01579   int vy =  x + y * 2;
    01580
    01581   /* clamp to size of map */
    01582   vx = Clamp(vx, 0, MapMaxX() * TILE_SIZE * 4 * ZOOM_LVL_BASE);
    01583   vy = Clamp(vy, 0, MapMaxY() * TILE_SIZE * 4 * ZOOM_LVL_BASE);
    01584
    01585   /* Convert map coordinates to viewport coordinates */
    01586   x = (-vx + vy) / 2;
    01587   y = ( vx + vy) / 4;
    01588
    01589   /* Remove centering */
    01590   x -= vp->virtual_width / 2;
    01591   y -= vp->virtual_height / 2;
    01592 }
    01593
    01598 void UpdateViewportPosition(Window *w)
    01599 {
    01600   const ViewPort *vp = w->viewport;
    01601
    01602   if (w->viewport->follow_vehicle != INVALID_VEHICLE) {
    01603     const Vehicle *veh = Vehicle::Get(w->viewport->follow_vehicle);
    01604     Point pt = MapXYZToViewport(vp, veh->x_pos, veh->y_pos, veh->z_pos);
    01605
    01606     w->viewport->scrollpos_x = pt.x;
    01607     w->viewport->scrollpos_y = pt.y;
    01608     SetViewportPosition(w, pt.x, pt.y);
    01609   } else {
    01610     /* Ensure the destination location is within the map */
    01611     ClampViewportToMap(vp, w->viewport->dest_scrollpos_x, w->viewport->dest_scrollpos_y);
    01612
    01613     int delta_x = w->viewport->dest_scrollpos_x - w->viewport->scrollpos_x;
    01614     int delta_y = w->viewport->dest_scrollpos_y - w->viewport->scrollpos_y;
    01615
    01616     if (delta_x != 0 || delta_y != 0) {
    01617       if (_settings_client.gui.smooth_scroll) {
    01618         int max_scroll = ScaleByMapSize1D(512 * ZOOM_LVL_BASE);
    01619         /* Not at our desired position yet... */
    01620         w->viewport->scrollpos_x += Clamp(delta_x / 4, -max_scroll, max_scroll);
    01621         w->viewport->scrollpos_y += Clamp(delta_y / 4, -max_scroll, max_scroll);
    01622       } else {
    01623         w->viewport->scrollpos_x = w->viewport->dest_scrollpos_x;
    01624         w->viewport->scrollpos_y = w->viewport->dest_scrollpos_y;
    01625       }
    01626     }
    01627
    01628     ClampViewportToMap(vp, w->viewport->scrollpos_x, w->viewport->scrollpos_y);
    01629
    01630     SetViewportPosition(w, w->viewport->scrollpos_x, w->viewport->scrollpos_y);
    01631   }
    01632 }
    01633
    01643 static void MarkViewportDirty(const ViewPort *vp, int left, int top, int right, int bottom)
    01644 {
    01645   right -= vp->virtual_left;
    01646   if (right <= 0) return;
    01647
    01648   bottom -= vp->virtual_top;
    01649   if (bottom <= 0) return;
    01650
    01651   left = max(0, left - vp->virtual_left);
    01652
    01653   if (left >= vp->virtual_width) return;
    01654
    01655   top = max(0, top - vp->virtual_top);
    01656
    01657   if (top >= vp->virtual_height) return;
    01658
    01659   SetDirtyBlocks(
    01660     UnScaleByZoomLower(left, vp->zoom) + vp->left,
    01661     UnScaleByZoomLower(top, vp->zoom) + vp->top,
    01662     UnScaleByZoom(right, vp->zoom) + vp->left + 1,
    01663     UnScaleByZoom(bottom, vp->zoom) + vp->top + 1
    01664   );
    01665 }
    01666
    01675 void MarkAllViewportsDirty(int left, int top, int right, int bottom)
    01676 {
    01677   Window *w;
    01678   FOR_ALL_WINDOWS_FROM_BACK(w) {
    01679     ViewPort *vp = w->viewport;
    01680     if (vp != NULL) {
    01681       assert(vp->width != 0);
    01682       MarkViewportDirty(vp, left, top, right, bottom);
    01683     }
    01684   }
    01685 }
    01686
    01687 void ConstrainAllViewportsZoom()
    01688 {
    01689   Window *w;
    01690   FOR_ALL_WINDOWS_FROM_FRONT(w) {
    01691     if (w->viewport == NULL) continue;
    01692
    01693     ZoomLevel zoom = static_cast<ZoomLevel>(Clamp(w->viewport->zoom, _settings_client.gui.zoom_min, _settings_client.gui.zoom_max));
    01694     if (zoom != w->viewport->zoom) {
    01695       while (w->viewport->zoom < zoom) DoZoomInOutWindow(ZOOM_OUT, w);
    01696       while (w->viewport->zoom > zoom) DoZoomInOutWindow(ZOOM_IN, w);
    01697     }
    01698   }
    01699 }
    01700
    01706 void MarkTileDirtyByTile(TileIndex tile)
    01707 {
    01708   Point pt = RemapCoords(TileX(tile) * TILE_SIZE, TileY(tile) * TILE_SIZE, GetTilePixelZ(tile));
    01709   MarkAllViewportsDirty(
    01710     pt.x - 31  * ZOOM_LVL_BASE,
    01711     pt.y - 122 * ZOOM_LVL_BASE,
    01712     pt.x - 31  * ZOOM_LVL_BASE + 67  * ZOOM_LVL_BASE,
    01713     pt.y - 122 * ZOOM_LVL_BASE + 154 * ZOOM_LVL_BASE
    01714   );
    01715 }
    01716
    01724 static void SetSelectionTilesDirty()
    01725 {
    01726   int x_size = _thd.size.x;
    01727   int y_size = _thd.size.y;
    01728
    01729   if (!_thd.diagonal) { // Selecting in a straight rectangle (or a single square)
    01730     int x_start = _thd.pos.x;
    01731     int y_start = _thd.pos.y;
    01732
    01733     if (_thd.outersize.x != 0) {
    01734       x_size  += _thd.outersize.x;
    01735       x_start += _thd.offs.x;
    01736       y_size  += _thd.outersize.y;
    01737       y_start += _thd.offs.y;
    01738     }
    01739
    01740     x_size -= TILE_SIZE;
    01741     y_size -= TILE_SIZE;
    01742
    01743     assert(x_size >= 0);
    01744     assert(y_size >= 0);
    01745
    01746     int x_end = Clamp(x_start + x_size, 0, MapSizeX() * TILE_SIZE - TILE_SIZE);
    01747     int y_end = Clamp(y_start + y_size, 0, MapSizeY() * TILE_SIZE - TILE_SIZE);
    01748
    01749     x_start = Clamp(x_start, 0, MapSizeX() * TILE_SIZE - TILE_SIZE);
    01750     y_start = Clamp(y_start, 0, MapSizeY() * TILE_SIZE - TILE_SIZE);
    01751
    01752     /* make sure everything is multiple of TILE_SIZE */
    01753     assert((x_end | y_end | x_start | y_start) % TILE_SIZE == 0);
    01754
    01755     /* How it works:
    01756      * Suppose we have to mark dirty rectangle of 3x4 tiles:
    01757      *   x
    01758      *  xxx
    01759      * xxxxx
    01760      *  xxxxx
    01761      *   xxx
    01762      *    x
    01763      * This algorithm marks dirty columns of tiles, so it is done in 3+4-1 steps:
    01764      * 1)  x     2)  x
    01765      *    xxx       Oxx
    01766      *   Oxxxx     xOxxx
    01767      *    xxxxx     Oxxxx
    01768      *     xxx       xxx
    01769      *      x         x
    01770      * And so forth...
    01771      */
    01772
    01773     int top_x = x_end; // coordinates of top dirty tile
    01774     int top_y = y_start;
    01775     int bot_x = top_x; // coordinates of bottom dirty tile
    01776     int bot_y = top_y;
    01777
    01778     do {
    01779       /* topmost dirty point */
    01780       TileIndex top_tile = TileVirtXY(top_x, top_y);
    01781       Point top = RemapCoords(top_x, top_y, GetTileMaxPixelZ(top_tile));
    01782
    01783       /* bottommost point */
    01784       TileIndex bottom_tile = TileVirtXY(bot_x, bot_y);
    01785       Point bot = RemapCoords(bot_x + TILE_SIZE, bot_y + TILE_SIZE, GetTilePixelZ(bottom_tile)); // bottommost point
    01786
    01787       /* the 'x' coordinate of 'top' and 'bot' is the same (and always in the same distance from tile middle),
    01788        * tile height/slope affects only the 'y' on-screen coordinate! */
    01789
    01790       int l = top.x - (TILE_PIXELS - 2) * ZOOM_LVL_BASE; // 'x' coordinate of left side of dirty rectangle
    01791       int t = top.y;                     // 'y' coordinate of top side -//-
    01792       int r = top.x + (TILE_PIXELS - 2) * ZOOM_LVL_BASE; // right side of dirty rectangle
    01793       int b = bot.y;                     // bottom -//-
    01794
    01795       static const int OVERLAY_WIDTH = 4 * ZOOM_LVL_BASE; // part of selection sprites is drawn outside the selected area
    01796
    01797       /* For halftile foundations on SLOPE_STEEP_S the sprite extents some more towards the top */
    01798       MarkAllViewportsDirty(l - OVERLAY_WIDTH, t - OVERLAY_WIDTH - TILE_HEIGHT * ZOOM_LVL_BASE, r + OVERLAY_WIDTH, b + OVERLAY_WIDTH * ZOOM_LVL_BASE);
    01799
    01800       /* haven't we reached the topmost tile yet? */
    01801       if (top_x != x_start) {
    01802         top_x -= TILE_SIZE;
    01803       } else {
    01804         top_y += TILE_SIZE;
    01805       }
    01806
    01807       /* the way the bottom tile changes is different when we reach the bottommost tile */
    01808       if (bot_y != y_end) {
    01809         bot_y += TILE_SIZE;
    01810       } else {
    01811         bot_x -= TILE_SIZE;
    01812       }
    01813     } while (bot_x >= top_x);
    01814   } else { // Selecting in a 45 degrees rotated (diagonal) rectangle.
    01815     /* a_size, b_size describe a rectangle with rotated coordinates */
    01816     int a_size = x_size + y_size, b_size = x_size - y_size;
    01817
    01818     int interval_a = a_size < 0 ? -(int)TILE_SIZE : (int)TILE_SIZE;
    01819     int interval_b = b_size < 0 ? -(int)TILE_SIZE : (int)TILE_SIZE;
    01820
    01821     for (int a = -interval_a; a != a_size + interval_a; a += interval_a) {
    01822       for (int b = -interval_b; b != b_size + interval_b; b += interval_b) {
    01823         uint x = (_thd.pos.x + (a + b) / 2) / TILE_SIZE;
    01824         uint y = (_thd.pos.y + (a - b) / 2) / TILE_SIZE;
    01825
    01826         if (x < MapMaxX() && y < MapMaxY()) {
    01827           MarkTileDirtyByTile(TileXY(x, y));
    01828         }
    01829       }
    01830     }
    01831   }
    01832 }
    01833
    01834
    01835 void SetSelectionRed(bool b)
    01836 {
    01837   _thd.make_square_red = b;
    01838   SetSelectionTilesDirty();
    01839 }
    01840
    01849 static bool CheckClickOnViewportSign(const ViewPort *vp, int x, int y, const ViewportSign *sign)
    01850 {
    01851   bool small = (vp->zoom >= ZOOM_LVL_OUT_16X);
    01852   int sign_half_width = ScaleByZoom((small ? sign->width_small : sign->width_normal) / 2, vp->zoom);
    01853   int sign_height = ScaleByZoom(VPSM_TOP + (small ? FONT_HEIGHT_SMALL : FONT_HEIGHT_NORMAL) + VPSM_BOTTOM, vp->zoom);
    01854
    01855   x = ScaleByZoom(x - vp->left, vp->zoom) + vp->virtual_left;
    01856   y = ScaleByZoom(y - vp->top, vp->zoom) + vp->virtual_top;
    01857
    01858   return y >= sign->top && y < sign->top + sign_height &&
    01859       x >= sign->center - sign_half_width && x < sign->center + sign_half_width;
    01860 }
    01861
    01862 static bool CheckClickOnTown(const ViewPort *vp, int x, int y)
    01863 {
    01864   if (!HasBit(_display_opt, DO_SHOW_TOWN_NAMES)) return false;
    01865
    01866   const Town *t;
    01867   FOR_ALL_TOWNS(t) {
    01868     if (CheckClickOnViewportSign(vp, x, y, &t->cache.sign)) {
    01869       ShowTownViewWindow(t->index);
    01870       return true;
    01871     }
    01872   }
    01873
    01874   return false;
    01875 }
    01876
    01877 static bool CheckClickOnStation(const ViewPort *vp, int x, int y)
    01878 {
    01879   if (!(HasBit(_display_opt, DO_SHOW_STATION_NAMES) || HasBit(_display_opt, DO_SHOW_WAYPOINT_NAMES)) || IsInvisibilitySet(TO_SIGNS)) return false;
    01880
    01881   const BaseStation *st;
    01882   FOR_ALL_BASE_STATIONS(st) {
    01883     /* Check whether the base station is a station or a waypoint */
    01884     bool is_station = Station::IsExpected(st);
    01885
    01886     /* Don't check if the display options are disabled */
    01887     if (!HasBit(_display_opt, is_station ? DO_SHOW_STATION_NAMES : DO_SHOW_WAYPOINT_NAMES)) continue;
    01888
    01889     /* Don't check if competitor signs are not shown and the sign isn't owned by the local company */
    01890     if (!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS) && _local_company != st->owner && st->owner != OWNER_NONE) continue;
    01891
    01892     if (CheckClickOnViewportSign(vp, x, y, &st->sign)) {
    01893       if (is_station) {
    01894         ShowStationViewWindow(st->index);
    01895       } else {
    01896         ShowWaypointWindow(Waypoint::From(st));
    01897       }
    01898       return true;
    01899     }
    01900   }
    01901
    01902   return false;
    01903 }
    01904
    01905
    01906 static bool CheckClickOnSign(const ViewPort *vp, int x, int y)
    01907 {
    01908   /* Signs are turned off, or they are transparent and invisibility is ON, or company is a spectator */
    01909   if (!HasBit(_display_opt, DO_SHOW_SIGNS) || IsInvisibilitySet(TO_SIGNS) || _local_company == COMPANY_SPECTATOR) return false;
    01910
    01911   const Sign *si;
    01912   FOR_ALL_SIGNS(si) {
    01913     /* If competitor signs are hidden, don't check signs that aren't owned by local company */
    01914     if (!HasBit(_display_opt, DO_SHOW_COMPETITOR_SIGNS) && _local_company != si->owner && si->owner != OWNER_DEITY) continue;
    01915     if (si->owner == OWNER_DEITY && _game_mode != GM_EDITOR) continue;
    01916
    01917     if (CheckClickOnViewportSign(vp, x, y, &si->sign)) {
    01918       HandleClickOnSign(si);
    01919       return true;
    01920     }
    01921   }
    01922
    01923   return false;
    01924 }
    01925
    01926
    01927 static bool CheckClickOnLandscape(const ViewPort *vp, int x, int y)
    01928 {
    01929   Point pt = TranslateXYToTileCoord(vp, x, y);
    01930
    01931   if (pt.x != -1) return ClickTile(TileVirtXY(pt.x, pt.y));
    01932   return true;
    01933 }
    01934
    01935 static void PlaceObject()
    01936 {
    01937   Point pt;
    01938   Window *w;
    01939
    01940   pt = GetTileBelowCursor();
    01941   if (pt.x == -1) return;
    01942
    01943   if ((_thd.place_mode & HT_DRAG_MASK) == HT_POINT) {
    01944     pt.x += TILE_SIZE / 2;
    01945     pt.y += TILE_SIZE / 2;
    01946   }
    01947
    01948   _tile_fract_coords.x = pt.x & TILE_UNIT_MASK;
    01949   _tile_fract_coords.y = pt.y & TILE_UNIT_MASK;
    01950
    01951   w = _thd.GetCallbackWnd();
    01952   if (w != NULL) w->OnPlaceObject(pt, TileVirtXY(pt.x, pt.y));
    01953 }
    01954
    01955
    01956 bool HandleViewportClicked(const ViewPort *vp, int x, int y)
    01957 {
    01958   const Vehicle *v = CheckClickOnVehicle(vp, x, y);
    01959
    01960   if (_thd.place_mode & HT_VEHICLE) {
    01961     if (v != NULL && VehicleClicked(v)) return true;
    01962   }
    01963
    01964   /* Vehicle placement mode already handled above. */
    01965   if ((_thd.place_mode & HT_DRAG_MASK) != HT_NONE) {
    01966     PlaceObject();
    01967     return true;
    01968   }
    01969
    01970   if (CheckClickOnTown(vp, x, y)) return true;
    01971   if (CheckClickOnStation(vp, x, y)) return true;
    01972   if (CheckClickOnSign(vp, x, y)) return true;
    01973   bool result = CheckClickOnLandscape(vp, x, y);
    01974
    01975   if (v != NULL) {
    01976     DEBUG(misc, 2, "Vehicle %d (index %d) at %p", v->unitnumber, v->index, v);
    01977     if (IsCompanyBuildableVehicleType(v)) {
    01978       v = v->First();
    01979       if (_ctrl_pressed && v->owner == _local_company) {
    01980         StartStopVehicle(v, true);
    01981       } else {
    01982         ShowVehicleViewWindow(v);
    01983       }
    01984     }
    01985     return true;
    01986   }
    01987   return result;
    01988 }
    01989
    01990
    02000 bool ScrollWindowTo(int x, int y, int z, Window *w, bool instant)
    02001 {
    02002   /* The slope cannot be acquired outside of the map, so make sure we are always within the map. */
    02003   if (z == -1) z = GetSlopePixelZ(Clamp(x, 0, MapSizeX() * TILE_SIZE - 1), Clamp(y, 0, MapSizeY() * TILE_SIZE - 1));
    02004
    02005   Point pt = MapXYZToViewport(w->viewport, x, y, z);
    02006   w->viewport->follow_vehicle = INVALID_VEHICLE;
    02007
    02008   if (w->viewport->dest_scrollpos_x == pt.x && w->viewport->dest_scrollpos_y == pt.y) return false;
    02009
    02010   if (instant) {
    02011     w->viewport->scrollpos_x = pt.x;
    02012     w->viewport->scrollpos_y = pt.y;
    02013   }
    02014
    02015   w->viewport->dest_scrollpos_x = pt.x;
    02016   w->viewport->dest_scrollpos_y = pt.y;
    02017   return true;
    02018 }
    02019
    02027 bool ScrollWindowToTile(TileIndex tile, Window *w, bool instant)
    02028 {
    02029   return ScrollWindowTo(TileX(tile) * TILE_SIZE, TileY(tile) * TILE_SIZE, -1, w, instant);
    02030 }
    02031
    02038 bool ScrollMainWindowToTile(TileIndex tile, bool instant)
    02039 {
    02040   return ScrollMainWindowTo(TileX(tile) * TILE_SIZE + TILE_SIZE / 2, TileY(tile) * TILE_SIZE + TILE_SIZE / 2, -1, instant);
    02041 }
    02042
    02047 void SetRedErrorSquare(TileIndex tile)
    02048 {
    02049   TileIndex old;
    02050
    02051   old = _thd.redsq;
    02052   _thd.redsq = tile;
    02053
    02054   if (tile != old) {
    02055     if (tile != INVALID_TILE) MarkTileDirtyByTile(tile);
    02056     if (old  != INVALID_TILE) MarkTileDirtyByTile(old);
    02057   }
    02058 }
    02059
    02065 void SetTileSelectSize(int w, int h)
    02066 {
    02067   _thd.new_size.x = w * TILE_SIZE;
    02068   _thd.new_size.y = h * TILE_SIZE;
    02069   _thd.new_outersize.x = 0;
    02070   _thd.new_outersize.y = 0;
    02071 }
    02072
    02073 void SetTileSelectBigSize(int ox, int oy, int sx, int sy)
    02074 {
    02075   _thd.offs.x = ox * TILE_SIZE;
    02076   _thd.offs.y = oy * TILE_SIZE;
    02077   _thd.new_outersize.x = sx * TILE_SIZE;
    02078   _thd.new_outersize.y = sy * TILE_SIZE;
    02079 }
    02080
    02082 static HighLightStyle GetAutorailHT(int x, int y)
    02083 {
    02084   return HT_RAIL | _autorail_piece[x & TILE_UNIT_MASK][y & TILE_UNIT_MASK];
    02085 }
    02086
    02090 void TileHighlightData::Reset()
    02091 {
    02092   this->pos.x = 0;
    02093   this->pos.y = 0;
    02094   this->new_pos.x = 0;
    02095   this->new_pos.y = 0;
    02096 }
    02097
    02102 bool TileHighlightData::IsDraggingDiagonal()
    02103 {
    02104   return (this->place_mode & HT_DIAGONAL) != 0 && _ctrl_pressed && _left_button_down;
    02105 }
    02106
    02111 Window *TileHighlightData::GetCallbackWnd()
    02112 {
    02113   return FindWindowById(this->window_class, this->window_number);
    02114 }
    02115
    02116
    02117
    02125 void UpdateTileSelection()
    02126 {
    02127   int x1;
    02128   int y1;
    02129
    02130   HighLightStyle new_drawstyle = HT_NONE;
    02131   bool new_diagonal = false;
    02132
    02133   if ((_thd.place_mode & HT_DRAG_MASK) == HT_SPECIAL) {
    02134     x1 = _thd.selend.x;
    02135     y1 = _thd.selend.y;
    02136     if (x1 != -1) {
    02137       int x2 = _thd.selstart.x & ~TILE_UNIT_MASK;
    02138       int y2 = _thd.selstart.y & ~TILE_UNIT_MASK;
    02139       x1 &= ~TILE_UNIT_MASK;
    02140       y1 &= ~TILE_UNIT_MASK;
    02141
    02142       if (_thd.IsDraggingDiagonal()) {
    02143         new_diagonal = true;
    02144       } else {
    02145         if (x1 >= x2) Swap(x1, x2);
    02146         if (y1 >= y2) Swap(y1, y2);
    02147       }
    02148       _thd.new_pos.x = x1;
    02149       _thd.new_pos.y = y1;
    02150       _thd.new_size.x = x2 - x1;
    02151       _thd.new_size.y = y2 - y1;
    02152       if (!new_diagonal) {
    02153         _thd.new_size.x += TILE_SIZE;
    02154         _thd.new_size.y += TILE_SIZE;
    02155       }
    02156       new_drawstyle = _thd.next_drawstyle;
    02157     }
    02158   } else if ((_thd.place_mode & HT_DRAG_MASK) != HT_NONE) {
    02159     Point pt = GetTileBelowCursor();
    02160     x1 = pt.x;
    02161     y1 = pt.y;
    02162     if (x1 != -1) {
    02163       switch (_thd.place_mode & HT_DRAG_MASK) {
    02164         case HT_RECT:
    02165           new_drawstyle = HT_RECT;
    02166           break;
    02167         case HT_POINT:
    02168           new_drawstyle = HT_POINT;
    02169           x1 += TILE_SIZE / 2;
    02170           y1 += TILE_SIZE / 2;
    02171           break;
    02172         case HT_RAIL:
    02173           /* Draw one highlighted tile in any direction */
    02174           new_drawstyle = GetAutorailHT(pt.x, pt.y);
    02175           break;
    02176         case HT_LINE:
    02177           switch (_thd.place_mode & HT_DIR_MASK) {
    02178             case HT_DIR_X: new_drawstyle = HT_LINE | HT_DIR_X; break;
    02179             case HT_DIR_Y: new_drawstyle = HT_LINE | HT_DIR_Y; break;
    02180
    02181             case HT_DIR_HU:
    02182             case HT_DIR_HL:
    02183               new_drawstyle = (pt.x & TILE_UNIT_MASK) + (pt.y & TILE_UNIT_MASK) <= TILE_SIZE ? HT_LINE | HT_DIR_HU : HT_LINE | HT_DIR_HL;
    02184               break;
    02185
    02186             case HT_DIR_VL:
    02187             case HT_DIR_VR:
    02188               new_drawstyle = (pt.x & TILE_UNIT_MASK) > (pt.y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02189               break;
    02190
    02191             default: NOT_REACHED();
    02192           }
    02193           _thd.selstart.x = x1 & ~TILE_UNIT_MASK;
    02194           _thd.selstart.y = y1 & ~TILE_UNIT_MASK;
    02195           break;
    02196         default:
    02197           NOT_REACHED();
    02198           break;
    02199       }
    02200       _thd.new_pos.x = x1 & ~TILE_UNIT_MASK;
    02201       _thd.new_pos.y = y1 & ~TILE_UNIT_MASK;
    02202     }
    02203   }
    02204
    02205   /* redraw selection */
    02206   if (_thd.drawstyle != new_drawstyle ||
    02207       _thd.pos.x != _thd.new_pos.x || _thd.pos.y != _thd.new_pos.y ||
    02208       _thd.size.x != _thd.new_size.x || _thd.size.y != _thd.new_size.y ||
    02209       _thd.outersize.x != _thd.new_outersize.x ||
    02210       _thd.outersize.y != _thd.new_outersize.y ||
    02211       _thd.diagonal    != new_diagonal) {
    02212     /* Clear the old tile selection? */
    02213     if ((_thd.drawstyle & HT_DRAG_MASK) != HT_NONE) SetSelectionTilesDirty();
    02214
    02215     _thd.drawstyle = new_drawstyle;
    02216     _thd.pos = _thd.new_pos;
    02217     _thd.size = _thd.new_size;
    02218     _thd.outersize = _thd.new_outersize;
    02219     _thd.diagonal = new_diagonal;
    02220     _thd.dirty = 0xff;
    02221
    02222     /* Draw the new tile selection? */
    02223     if ((new_drawstyle & HT_DRAG_MASK) != HT_NONE) SetSelectionTilesDirty();
    02224   }
    02225 }
    02226
    02234 static inline void ShowMeasurementTooltips(StringID str, uint paramcount, const uint64 params[], TooltipCloseCondition close_cond = TCC_LEFT_CLICK)
    02235 {
    02236   if (!_settings_client.gui.measure_tooltip) return;
    02237   GuiShowTooltips(_thd.GetCallbackWnd(), str, paramcount, params, close_cond);
    02238 }
    02239
    02241 void VpStartPlaceSizing(TileIndex tile, ViewportPlaceMethod method, ViewportDragDropSelectionProcess process)
    02242 {
    02243   _thd.select_method = method;
    02244   _thd.select_proc   = process;
    02245   _thd.selend.x = TileX(tile) * TILE_SIZE;
    02246   _thd.selstart.x = TileX(tile) * TILE_SIZE;
    02247   _thd.selend.y = TileY(tile) * TILE_SIZE;
    02248   _thd.selstart.y = TileY(tile) * TILE_SIZE;
    02249
    02250   /* Needed so several things (road, autoroad, bridges, ...) are placed correctly.
    02251    * In effect, placement starts from the centre of a tile
    02252    */
    02253   if (method == VPM_X_OR_Y || method == VPM_FIX_X || method == VPM_FIX_Y) {
    02254     _thd.selend.x += TILE_SIZE / 2;
    02255     _thd.selend.y += TILE_SIZE / 2;
    02256     _thd.selstart.x += TILE_SIZE / 2;
    02257     _thd.selstart.y += TILE_SIZE / 2;
    02258   }
    02259
    02260   HighLightStyle others = _thd.place_mode & ~(HT_DRAG_MASK | HT_DIR_MASK);
    02261   if ((_thd.place_mode & HT_DRAG_MASK) == HT_RECT) {
    02262     _thd.place_mode = HT_SPECIAL | others;
    02263     _thd.next_drawstyle = HT_RECT | others;
    02264   } else if (_thd.place_mode & (HT_RAIL | HT_LINE)) {
    02265     _thd.place_mode = HT_SPECIAL | others;
    02266     _thd.next_drawstyle = _thd.drawstyle | others;
    02267   } else {
    02268     _thd.place_mode = HT_SPECIAL | others;
    02269     _thd.next_drawstyle = HT_POINT | others;
    02270   }
    02271   _special_mouse_mode = WSM_SIZING;
    02272 }
    02273
    02274 void VpSetPlaceSizingLimit(int limit)
    02275 {
    02276   _thd.sizelimit = limit;
    02277 }
    02278
    02284 void VpSetPresizeRange(TileIndex from, TileIndex to)
    02285 {
    02286   uint64 distance = DistanceManhattan(from, to) + 1;
    02287
    02288   _thd.selend.x = TileX(to) * TILE_SIZE;
    02289   _thd.selend.y = TileY(to) * TILE_SIZE;
    02290   _thd.selstart.x = TileX(from) * TILE_SIZE;
    02291   _thd.selstart.y = TileY(from) * TILE_SIZE;
    02292   _thd.next_drawstyle = HT_RECT;
    02293
    02294   /* show measurement only if there is any length to speak of */
    02295   if (distance > 1) ShowMeasurementTooltips(STR_MEASURE_LENGTH, 1, &distance, TCC_HOVER);
    02296 }
    02297
    02298 static void VpStartPreSizing()
    02299 {
    02300   _thd.selend.x = -1;
    02301   _special_mouse_mode = WSM_PRESIZE;
    02302 }
    02303
    02308 static HighLightStyle Check2x1AutoRail(int mode)
    02309 {
    02310   int fxpy = _tile_fract_coords.x + _tile_fract_coords.y;
    02311   int sxpy = (_thd.selend.x & TILE_UNIT_MASK) + (_thd.selend.y & TILE_UNIT_MASK);
    02312   int fxmy = _tile_fract_coords.x - _tile_fract_coords.y;
    02313   int sxmy = (_thd.selend.x & TILE_UNIT_MASK) - (_thd.selend.y & TILE_UNIT_MASK);
    02314
    02315   switch (mode) {
    02316     default: NOT_REACHED();
    02317     case 0: // end piece is lower right
    02318       if (fxpy >= 20 && sxpy <= 12) return HT_DIR_HL;
    02319       if (fxmy < -3 && sxmy > 3) return HT_DIR_VR;
    02320       return HT_DIR_Y;
    02321
    02322     case 1:
    02323       if (fxmy > 3 && sxmy < -3) return HT_DIR_VL;
    02324       if (fxpy <= 12 && sxpy >= 20) return HT_DIR_HU;
    02325       return HT_DIR_Y;
    02326
    02327     case 2:
    02328       if (fxmy > 3 && sxmy < -3) return HT_DIR_VL;
    02329       if (fxpy >= 20 && sxpy <= 12) return HT_DIR_HL;
    02330       return HT_DIR_X;
    02331
    02332     case 3:
    02333       if (fxmy < -3 && sxmy > 3) return HT_DIR_VR;
    02334       if (fxpy <= 12 && sxpy >= 20) return HT_DIR_HU;
    02335       return HT_DIR_X;
    02336   }
    02337 }
    02338
    02352 static bool SwapDirection(HighLightStyle style, TileIndex start_tile, TileIndex end_tile)
    02353 {
    02354   uint start_x = TileX(start_tile);
    02355   uint start_y = TileY(start_tile);
    02356   uint end_x = TileX(end_tile);
    02357   uint end_y = TileY(end_tile);
    02358
    02359   switch (style & HT_DRAG_MASK) {
    02360     case HT_RAIL:
    02361     case HT_LINE: return (end_x > start_x || (end_x == start_x && end_y > start_y));
    02362
    02363     case HT_RECT:
    02364     case HT_POINT: return (end_x != start_x && end_y < start_y);
    02365     default: NOT_REACHED();
    02366   }
    02367
    02368   return false;
    02369 }
    02370
    02386 static int CalcHeightdiff(HighLightStyle style, uint distance, TileIndex start_tile, TileIndex end_tile)
    02387 {
    02388   bool swap = SwapDirection(style, start_tile, end_tile);
    02389   uint h0, h1; // Start height and end height.
    02390
    02391   if (start_tile == end_tile) return 0;
    02392   if (swap) Swap(start_tile, end_tile);
    02393
    02394   switch (style & HT_DRAG_MASK) {
    02395     case HT_RECT: {
    02396       static const TileIndexDiffC heightdiff_area_by_dir[] = {
    02397         /* Start */ {1, 0}, /* Dragging east */ {0, 0}, // Dragging south
    02398         /* End   */ {0, 1}, /* Dragging east */ {1, 1}  // Dragging south
    02399       };
    02400
    02401       /* In the case of an area we can determine whether we were dragging south or
    02402        * east by checking the X-coordinates of the tiles */
    02403       byte style_t = (byte)(TileX(end_tile) > TileX(start_tile));
    02404       start_tile = TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_area_by_dir[style_t]));
    02405       end_tile   = TILE_ADD(end_tile, ToTileIndexDiff(heightdiff_area_by_dir[2 + style_t]));
    02406       /* FALL THROUGH */
    02407     }
    02408
    02409     case HT_POINT:
    02410       h0 = TileHeight(start_tile);
    02411       h1 = TileHeight(end_tile);
    02412       break;
    02413     default: { // All other types, this is mostly only line/autorail
    02414       static const HighLightStyle flip_style_direction[] = {
    02415         HT_DIR_X, HT_DIR_Y, HT_DIR_HL, HT_DIR_HU, HT_DIR_VR, HT_DIR_VL
    02416       };
    02417       static const TileIndexDiffC heightdiff_line_by_dir[] = {
    02418         /* Start */ {1, 0}, {1, 1}, /* HT_DIR_X  */ {0, 1}, {1, 1}, // HT_DIR_Y
    02419         /* Start */ {1, 0}, {0, 0}, /* HT_DIR_HU */ {1, 0}, {1, 1}, // HT_DIR_HL
    02420         /* Start */ {1, 0}, {1, 1}, /* HT_DIR_VL */ {0, 1}, {1, 1}, // HT_DIR_VR
    02421
    02422         /* Start */ {0, 1}, {0, 0}, /* HT_DIR_X  */ {1, 0}, {0, 0}, // HT_DIR_Y
    02423         /* End   */ {0, 1}, {0, 0}, /* HT_DIR_HU */ {1, 1}, {0, 1}, // HT_DIR_HL
    02424         /* End   */ {1, 0}, {0, 0}, /* HT_DIR_VL */ {0, 0}, {0, 1}, // HT_DIR_VR
    02425       };
    02426
    02427       distance %= 2; // we're only interested if the distance is even or uneven
    02428       style &= HT_DIR_MASK;
    02429
    02430       /* To handle autorail, we do some magic to be able to use a lookup table.
    02431        * Firstly if we drag the other way around, we switch start&end, and if needed
    02432        * also flip the drag-position. Eg if it was on the left, and the distance is even
    02433        * that means the end, which is now the start is on the right */
    02434       if (swap && distance == 0) style = flip_style_direction[style];
    02435
    02436       /* Use lookup table for start-tile based on HighLightStyle direction */
    02437       byte style_t = style * 2;
    02438       assert(style_t < lengthof(heightdiff_line_by_dir) - 13);
    02439       h0 = TileHeight(TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_line_by_dir[style_t])));
    02440       uint ht = TileHeight(TILE_ADD(start_tile, ToTileIndexDiff(heightdiff_line_by_dir[style_t + 1])));
    02441       h0 = max(h0, ht);
    02442
    02443       /* Use lookup table for end-tile based on HighLightStyle direction
    02444        * flip around side (lower/upper, left/right) based on distance */
    02445       if (distance == 0) style_t = flip_style_direction[style] * 2;
    02446       assert(style_t < lengthof(heightdiff_line_by_dir) - 13);
    02447       h1 = TileHeight(TILE_ADD(end_tile, ToTileIndexDiff(heightdiff_line_by_dir[12 + style_t])));
    02448       ht = TileHeight(TILE_ADD(end_tile, ToTileIndexDiff(heightdiff_line_by_dir[12 + style_t + 1])));
    02449       h1 = max(h1, ht);
    02450       break;
    02451     }
    02452   }
    02453
    02454   if (swap) Swap(h0, h1);
    02455   return (int)(h1 - h0) * TILE_HEIGHT_STEP;
    02456 }
    02457
    02458 static const StringID measure_strings_length[] = {STR_NULL, STR_MEASURE_LENGTH, STR_MEASURE_LENGTH_HEIGHTDIFF};
    02459
    02466 static void CheckUnderflow(int &test, int &other, int mult)
    02467 {
    02468   if (test >= 0) return;
    02469
    02470   other += mult * test;
    02471   test = 0;
    02472 }
    02473
    02481 static void CheckOverflow(int &test, int &other, int max, int mult)
    02482 {
    02483   if (test <= max) return;
    02484
    02485   other += mult * (test - max);
    02486   test = max;
    02487 }
    02488
    02490 static void CalcRaildirsDrawstyle(int x, int y, int method)
    02491 {
    02492   HighLightStyle b;
    02493
    02494   int dx = _thd.selstart.x - (_thd.selend.x & ~TILE_UNIT_MASK);
    02495   int dy = _thd.selstart.y - (_thd.selend.y & ~TILE_UNIT_MASK);
    02496   uint w = abs(dx) + TILE_SIZE;
    02497   uint h = abs(dy) + TILE_SIZE;
    02498
    02499   if (method & ~(VPM_RAILDIRS | VPM_SIGNALDIRS)) {
    02500     /* We 'force' a selection direction; first four rail buttons. */
    02501     method &= ~(VPM_RAILDIRS | VPM_SIGNALDIRS);
    02502     int raw_dx = _thd.selstart.x - _thd.selend.x;
    02503     int raw_dy = _thd.selstart.y - _thd.selend.y;
    02504     switch (method) {
    02505       case VPM_FIX_X:
    02506         b = HT_LINE | HT_DIR_Y;
    02507         x = _thd.selstart.x;
    02508         break;
    02509
    02510       case VPM_FIX_Y:
    02511         b = HT_LINE | HT_DIR_X;
    02512         y = _thd.selstart.y;
    02513         break;
    02514
    02515       case VPM_FIX_HORIZONTAL:
    02516         if (dx == -dy) {
    02517           /* We are on a straight horizontal line. Determine the 'rail'
    02518            * to build based the sub tile location. */
    02519           b = (x & TILE_UNIT_MASK) + (y & TILE_UNIT_MASK) >= TILE_SIZE ? HT_LINE | HT_DIR_HL : HT_LINE | HT_DIR_HU;
    02520         } else {
    02521           /* We are not on a straight line. Determine the rail to build
    02522            * based on whether we are above or below it. */
    02523           b = dx + dy >= (int)TILE_SIZE ? HT_LINE | HT_DIR_HU : HT_LINE | HT_DIR_HL;
    02524
    02525           /* Calculate where a horizontal line through the start point and
    02526            * a vertical line from the selected end point intersect and
    02527            * use that point as the end point. */
    02528           int offset = (raw_dx - raw_dy) / 2;
    02529           x = _thd.selstart.x - (offset & ~TILE_UNIT_MASK);
    02530           y = _thd.selstart.y + (offset & ~TILE_UNIT_MASK);
    02531
    02532           /* 'Build' the last half rail tile if needed */
    02533           if ((offset & TILE_UNIT_MASK) > (TILE_SIZE / 2)) {
    02534             if (dx + dy >= (int)TILE_SIZE) {
    02535               x += (dx + dy < 0) ? (int)TILE_SIZE : -(int)TILE_SIZE;
    02536             } else {
    02537               y += (dx + dy < 0) ? (int)TILE_SIZE : -(int)TILE_SIZE;
    02538             }
    02539           }
    02540
    02541           /* Make sure we do not overflow the map! */
    02542           CheckUnderflow(x, y, 1);
    02543           CheckUnderflow(y, x, 1);
    02544           CheckOverflow(x, y, (MapMaxX() - 1) * TILE_SIZE, 1);
    02545           CheckOverflow(y, x, (MapMaxY() - 1) * TILE_SIZE, 1);
    02546           assert(x >= 0 && y >= 0 && x <= (int)(MapMaxX() * TILE_SIZE) && y <= (int)(MapMaxY() * TILE_SIZE));
    02547         }
    02548         break;
    02549
    02550       case VPM_FIX_VERTICAL:
    02551         if (dx == dy) {
    02552           /* We are on a straight vertical line. Determine the 'rail'
    02553            * to build based the sub tile location. */
    02554           b = (x & TILE_UNIT_MASK) > (y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02555         } else {
    02556           /* We are not on a straight line. Determine the rail to build
    02557            * based on whether we are left or right from it. */
    02558           b = dx < dy ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02559
    02560           /* Calculate where a vertical line through the start point and
    02561            * a horizontal line from the selected end point intersect and
    02562            * use that point as the end point. */
    02563           int offset = (raw_dx + raw_dy + (int)TILE_SIZE) / 2;
    02564           x = _thd.selstart.x - (offset & ~TILE_UNIT_MASK);
    02565           y = _thd.selstart.y - (offset & ~TILE_UNIT_MASK);
    02566
    02567           /* 'Build' the last half rail tile if needed */
    02568           if ((offset & TILE_UNIT_MASK) > (TILE_SIZE / 2)) {
    02569             if (dx - dy < 0) {
    02570               y += (dx > dy) ? (int)TILE_SIZE : -(int)TILE_SIZE;
    02571             } else {
    02572               x += (dx < dy) ? (int)TILE_SIZE : -(int)TILE_SIZE;
    02573             }
    02574           }
    02575
    02576           /* Make sure we do not overflow the map! */
    02577           CheckUnderflow(x, y, -1);
    02578           CheckUnderflow(y, x, -1);
    02579           CheckOverflow(x, y, (MapMaxX() - 1) * TILE_SIZE, -1);
    02580           CheckOverflow(y, x, (MapMaxY() - 1) * TILE_SIZE, -1);
    02581           assert(x >= 0 && y >= 0 && x <= (int)(MapMaxX() * TILE_SIZE) && y <= (int)(MapMaxY() * TILE_SIZE));
    02582         }
    02583         break;
    02584
    02585       default:
    02586         NOT_REACHED();
    02587     }
    02588   } else if (TileVirtXY(_thd.selstart.x, _thd.selstart.y) == TileVirtXY(x, y)) { // check if we're only within one tile
    02589     if (method & VPM_RAILDIRS) {
    02590       b = GetAutorailHT(x, y);
    02591     } else { // rect for autosignals on one tile
    02592       b = HT_RECT;
    02593     }
    02594   } else if (h == TILE_SIZE) { // Is this in X direction?
    02595     if (dx == (int)TILE_SIZE) { // 2x1 special handling
    02596       b = (Check2x1AutoRail(3)) | HT_LINE;
    02597     } else if (dx == -(int)TILE_SIZE) {
    02598       b = (Check2x1AutoRail(2)) | HT_LINE;
    02599     } else {
    02600       b = HT_LINE | HT_DIR_X;
    02601     }
    02602     y = _thd.selstart.y;
    02603   } else if (w == TILE_SIZE) { // Or Y direction?
    02604     if (dy == (int)TILE_SIZE) { // 2x1 special handling
    02605       b = (Check2x1AutoRail(1)) | HT_LINE;
    02606     } else if (dy == -(int)TILE_SIZE) { // 2x1 other direction
    02607       b = (Check2x1AutoRail(0)) | HT_LINE;
    02608     } else {
    02609       b = HT_LINE | HT_DIR_Y;
    02610     }
    02611     x = _thd.selstart.x;
    02612   } else if (w > h * 2) { // still count as x dir?
    02613     b = HT_LINE | HT_DIR_X;
    02614     y = _thd.selstart.y;
    02615   } else if (h > w * 2) { // still count as y dir?
    02616     b = HT_LINE | HT_DIR_Y;
    02617     x = _thd.selstart.x;
    02618   } else { // complicated direction
    02619     int d = w - h;
    02620     _thd.selend.x = _thd.selend.x & ~TILE_UNIT_MASK;
    02621     _thd.selend.y = _thd.selend.y & ~TILE_UNIT_MASK;
    02622
    02623     /* four cases. */
    02624     if (x > _thd.selstart.x) {
    02625       if (y > _thd.selstart.y) {
    02626         /* south */
    02627         if (d == 0) {
    02628           b = (x & TILE_UNIT_MASK) > (y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02629         } else if (d >= 0) {
    02630           x = _thd.selstart.x + h;
    02631           b = HT_LINE | HT_DIR_VL;
    02632         } else {
    02633           y = _thd.selstart.y + w;
    02634           b = HT_LINE | HT_DIR_VR;
    02635         }
    02636       } else {
    02637         /* west */
    02638         if (d == 0) {
    02639           b = (x & TILE_UNIT_MASK) + (y & TILE_UNIT_MASK) >= TILE_SIZE ? HT_LINE | HT_DIR_HL : HT_LINE | HT_DIR_HU;
    02640         } else if (d >= 0) {
    02641           x = _thd.selstart.x + h;
    02642           b = HT_LINE | HT_DIR_HL;
    02643         } else {
    02644           y = _thd.selstart.y - w;
    02645           b = HT_LINE | HT_DIR_HU;
    02646         }
    02647       }
    02648     } else {
    02649       if (y > _thd.selstart.y) {
    02650         /* east */
    02651         if (d == 0) {
    02652           b = (x & TILE_UNIT_MASK) + (y & TILE_UNIT_MASK) >= TILE_SIZE ? HT_LINE | HT_DIR_HL : HT_LINE | HT_DIR_HU;
    02653         } else if (d >= 0) {
    02654           x = _thd.selstart.x - h;
    02655           b = HT_LINE | HT_DIR_HU;
    02656         } else {
    02657           y = _thd.selstart.y + w;
    02658           b = HT_LINE | HT_DIR_HL;
    02659         }
    02660       } else {
    02661         /* north */
    02662         if (d == 0) {
    02663           b = (x & TILE_UNIT_MASK) > (y & TILE_UNIT_MASK) ? HT_LINE | HT_DIR_VL : HT_LINE | HT_DIR_VR;
    02664         } else if (d >= 0) {
    02665           x = _thd.selstart.x - h;
    02666           b = HT_LINE | HT_DIR_VR;
    02667         } else {
    02668           y = _thd.selstart.y - w;
    02669           b = HT_LINE | HT_DIR_VL;
    02670         }
    02671       }
    02672     }
    02673   }
    02674
    02675   if (_settings_client.gui.measure_tooltip) {
    02676     TileIndex t0 = TileVirtXY(_thd.selstart.x, _thd.selstart.y);
    02677     TileIndex t1 = TileVirtXY(x, y);
    02678     uint distance = DistanceManhattan(t0, t1) + 1;
    02679     byte index = 0;
    02680     uint64 params[2];
    02681
    02682     if (distance != 1) {
    02683       int heightdiff = CalcHeightdiff(b, distance, t0, t1);
    02684       /* If we are showing a tooltip for horizontal or vertical drags,
    02685        * 2 tiles have a length of 1. To bias towards the ceiling we add
    02686        * one before division. It feels more natural to count 3 lengths as 2 */
    02687       if ((b & HT_DIR_MASK) != HT_DIR_X && (b & HT_DIR_MASK) != HT_DIR_Y) {
    02688         distance = CeilDiv(distance, 2);
    02689       }
    02690
    02691       params[index++] = distance;
    02692       if (heightdiff != 0) params[index++] = heightdiff;
    02693     }
    02694
    02695     ShowMeasurementTooltips(measure_strings_length[index], index, params);
    02696   }
    02697
    02698   _thd.selend.x = x;
    02699   _thd.selend.y = y;
    02700   _thd.next_drawstyle = b;
    02701 }
    02702
    02710 void VpSelectTilesWithMethod(int x, int y, ViewportPlaceMethod method)
    02711 {
    02712   int sx, sy;
    02713   HighLightStyle style;
    02714
    02715   if (x == -1) {
    02716     _thd.selend.x = -1;
    02717     return;
    02718   }
    02719
    02720   /* Special handling of drag in any (8-way) direction */
    02721   if (method & (VPM_RAILDIRS | VPM_SIGNALDIRS)) {
    02722     _thd.selend.x = x;
    02723     _thd.selend.y = y;
    02724     CalcRaildirsDrawstyle(x, y, method);
    02725     return;
    02726   }
    02727
    02728   /* Needed so level-land is placed correctly */
    02729   if ((_thd.next_drawstyle & HT_DRAG_MASK) == HT_POINT) {
    02730     x += TILE_SIZE / 2;
    02731     y += TILE_SIZE / 2;
    02732   }
    02733
    02734   sx = _thd.selstart.x;
    02735   sy = _thd.selstart.y;
    02736
    02737   int limit = 0;
    02738
    02739   switch (method) {
    02740     case VPM_X_OR_Y: // drag in X or Y direction
    02741       if (abs(sy - y) < abs(sx - x)) {
    02742         y = sy;
    02743         style = HT_DIR_X;
    02744       } else {
    02745         x = sx;
    02746         style = HT_DIR_Y;
    02747       }
    02748       goto calc_heightdiff_single_direction;
    02749
    02750     case VPM_X_LIMITED: // Drag in X direction (limited size).
    02751       limit = (_thd.sizelimit - 1) * TILE_SIZE;
    02752       /* FALL THROUGH */
    02753
    02754     case VPM_FIX_X: // drag in Y direction
    02755       x = sx;
    02756       style = HT_DIR_Y;
    02757       goto calc_heightdiff_single_direction;
    02758
    02759     case VPM_Y_LIMITED: // Drag in Y direction (limited size).
    02760       limit = (_thd.sizelimit - 1) * TILE_SIZE;
    02761       /* FALL THROUGH */
    02762
    02763     case VPM_FIX_Y: // drag in X direction
    02764       y = sy;
    02765       style = HT_DIR_X;
    02766
    02767 calc_heightdiff_single_direction:;
    02768       if (limit > 0) {
    02769         x = sx + Clamp(x - sx, -limit, limit);
    02770         y = sy + Clamp(y - sy, -limit, limit);
    02771       }
    02772       if (_settings_client.gui.measure_tooltip) {
    02773         TileIndex t0 = TileVirtXY(sx, sy);
    02774         TileIndex t1 = TileVirtXY(x, y);
    02775         uint distance = DistanceManhattan(t0, t1) + 1;
    02776         byte index = 0;
    02777         uint64 params[2];
    02778
    02779         if (distance != 1) {
    02780           /* With current code passing a HT_LINE style to calculate the height
    02781            * difference is enough. However if/when a point-tool is created
    02782            * with this method, function should be called with new_style (below)
    02783            * instead of HT_LINE | style case HT_POINT is handled specially
    02784            * new_style := (_thd.next_drawstyle & HT_RECT) ? HT_LINE | style : _thd.next_drawstyle; */
    02785           int heightdiff = CalcHeightdiff(HT_LINE | style, 0, t0, t1);
    02786
    02787           params[index++] = distance;
    02788           if (heightdiff != 0) params[index++] = heightdiff;
    02789         }
    02790
    02791         ShowMeasurementTooltips(measure_strings_length[index], index, params);
    02792       }
    02793       break;
    02794
    02795     case VPM_X_AND_Y_LIMITED: // Drag an X by Y constrained rect area.
    02796       limit = (_thd.sizelimit - 1) * TILE_SIZE;
    02797       x = sx + Clamp(x - sx, -limit, limit);
    02798       y = sy + Clamp(y - sy, -limit, limit);
    02799       /* FALL THROUGH */
    02800
    02801     case VPM_X_AND_Y: // drag an X by Y area
    02802       if (_settings_client.gui.measure_tooltip) {
    02803         static const StringID measure_strings_area[] = {
    02804           STR_NULL, STR_NULL, STR_MEASURE_AREA, STR_MEASURE_AREA_HEIGHTDIFF
    02805         };
    02806
    02807         TileIndex t0 = TileVirtXY(sx, sy);
    02808         TileIndex t1 = TileVirtXY(x, y);
    02809         uint dx = Delta(TileX(t0), TileX(t1)) + 1;
    02810         uint dy = Delta(TileY(t0), TileY(t1)) + 1;
    02811         byte index = 0;
    02812         uint64 params[3];
    02813
    02814         /* If dragging an area (eg dynamite tool) and it is actually a single
    02815          * row/column, change the type to 'line' to get proper calculation for height */
    02816         style = (HighLightStyle)_thd.next_drawstyle;
    02817         if (_thd.IsDraggingDiagonal()) {
    02818           /* Determine the "area" of the diagonal dragged selection.
    02819            * We assume the area is the number of tiles along the X
    02820            * edge and the number of tiles along the Y edge. However,
    02821            * multiplying these two numbers does not give the exact
    02822            * number of tiles; basically we are counting the black
    02823            * squares on a chess board and ignore the white ones to
    02824            * make the tile counts at the edges match up. There is no
    02825            * other way to make a proper count though.
    02826            *
    02827            * First convert to the rotated coordinate system. */
    02828           int dist_x = TileX(t0) - TileX(t1);
    02829           int dist_y = TileY(t0) - TileY(t1);
    02830           int a_max = dist_x + dist_y;
    02831           int b_max = dist_y - dist_x;
    02832
    02833           /* Now determine the size along the edge, but due to the
    02834            * chess board principle this counts double. */
    02835           a_max = abs(a_max + (a_max > 0 ? 2 : -2)) / 2;
    02836           b_max = abs(b_max + (b_max > 0 ? 2 : -2)) / 2;
    02837
    02838           /* We get a 1x1 on normal 2x1 rectangles, due to it being
    02839            * a seen as two sides. As the result for actual building
    02840            * will be the same as non-diagonal dragging revert to that
    02841            * behaviour to give it a more normally looking size. */
    02842           if (a_max != 1 || b_max != 1) {
    02843             dx = a_max;
    02844             dy = b_max;
    02845           }
    02846         } else if (style & HT_RECT) {
    02847           if (dx == 1) {
    02848             style = HT_LINE | HT_DIR_Y;
    02849           } else if (dy == 1) {
    02850             style = HT_LINE | HT_DIR_X;
    02851           }
    02852         }
    02853
    02854         if (dx != 1 || dy != 1) {
    02855           int heightdiff = CalcHeightdiff(style, 0, t0, t1);
    02856
    02857           params[index++] = dx - (style & HT_POINT ? 1 : 0);
    02858           params[index++] = dy - (style & HT_POINT ? 1 : 0);
    02859           if (heightdiff != 0) params[index++] = heightdiff;
    02860         }
    02861
    02862         ShowMeasurementTooltips(measure_strings_area[index], index, params);
    02863       }
    02864       break;
    02865
    02866     default: NOT_REACHED();
    02867   }
    02868
    02869   _thd.selend.x = x;
    02870   _thd.selend.y = y;
    02871 }
    02872
    02877 EventState VpHandlePlaceSizingDrag()
    02878 {
    02879   if (_special_mouse_mode != WSM_SIZING) return ES_NOT_HANDLED;
    02880
    02881   /* stop drag mode if the window has been closed */
    02882   Window *w = _thd.GetCallbackWnd();
    02883   if (w == NULL) {
    02884     ResetObjectToPlace();
    02885     return ES_HANDLED;
    02886   }
    02887
    02888   /* while dragging execute the drag procedure of the corresponding window (mostly VpSelectTilesWithMethod() ) */
    02889   if (_left_button_down) {
    02890     w->OnPlaceDrag(_thd.select_method, _thd.select_proc, GetTileBelowCursor());
    02891     return ES_HANDLED;
    02892   }
    02893
    02894   /* mouse button released..
    02895    * keep the selected tool, but reset it to the original mode. */
    02896   _special_mouse_mode = WSM_NONE;
    02897   HighLightStyle others = _thd.place_mode & ~(HT_DRAG_MASK | HT_DIR_MASK);
    02898   if ((_thd.next_drawstyle & HT_DRAG_MASK) == HT_RECT) {
    02899     _thd.place_mode = HT_RECT | others;
    02900   } else if (_thd.select_method & VPM_SIGNALDIRS) {
    02901     _thd.place_mode = HT_RECT | others;
    02902   } else if (_thd.select_method & VPM_RAILDIRS) {
    02903     _thd.place_mode = (_thd.select_method & ~VPM_RAILDIRS) ? _thd.next_drawstyle : (HT_RAIL | others);
    02904   } else {
    02905     _thd.place_mode = HT_POINT | others;
    02906   }
    02907   SetTileSelectSize(1, 1);
    02908
    02909   w->OnPlaceMouseUp(_thd.select_method, _thd.select_proc, _thd.selend, TileVirtXY(_thd.selstart.x, _thd.selstart.y), TileVirtXY(_thd.selend.x, _thd.selend.y));
    02910
    02911   return ES_HANDLED;
    02912 }
    02913
    02914 void SetObjectToPlaceWnd(CursorID icon, PaletteID pal, HighLightStyle mode, Window *w)
    02915 {
    02916   SetObjectToPlace(icon, pal, mode, w->window_class, w->window_number);
    02917 }
    02918
    02919 #include "table/animcursors.h"
    02920
    02921 void SetObjectToPlace(CursorID icon, PaletteID pal, HighLightStyle mode, WindowClass window_class, WindowNumber window_num)
    02922 {
    02923   if (_thd.window_class != WC_INVALID) {
    02924     /* Undo clicking on button and drag & drop */
    02925     Window *w = _thd.GetCallbackWnd();
    02926     /* Call the abort function, but set the window class to something
    02927      * that will never be used to avoid infinite loops. Setting it to
    02928      * the 'next' window class must not be done because recursion into
    02929      * this function might in some cases reset the newly set object to
    02930      * place or not properly reset the original selection. */
    02931     _thd.window_class = WC_INVALID;
    02932     if (w != NULL) w->OnPlaceObjectAbort();
    02933   }
    02934
    02935   /* Mark the old selection dirty, in case the selection shape or colour changes */
    02936   if ((_thd.drawstyle & HT_DRAG_MASK) != HT_NONE) SetSelectionTilesDirty();
    02937
    02938   SetTileSelectSize(1, 1);
    02939
    02940   _thd.make_square_red = false;
    02941
    02942   if (mode == HT_DRAG) { // HT_DRAG is for dragdropping trains in the depot window
    02943     mode = HT_NONE;
    02944     _special_mouse_mode = WSM_DRAGDROP;
    02945   } else {
    02946     _special_mouse_mode = WSM_NONE;
    02947   }
    02948
    02949   _thd.place_mode = mode;
    02950   _thd.window_class = window_class;
    02951   _thd.window_number = window_num;
    02952
    02953   if ((mode & HT_DRAG_MASK) == HT_SPECIAL) { // special tools, like tunnels or docks start with presizing mode
    02954     VpStartPreSizing();
    02955   }
    02956
    02957   if ((icon & ANIMCURSOR_FLAG) != 0) {
    02958     SetAnimatedMouseCursor(_animcursors[icon & ~ANIMCURSOR_FLAG]);
    02959   } else {
    02960     SetMouseCursor(icon, pal);
    02961   }
    02962
    02963 }
    02964
    02965 void ResetObjectToPlace()
    02966 {
    02967   SetObjectToPlace(SPR_CURSOR_MOUSE, PAL_NONE, HT_NONE, WC_MAIN_WINDOW, 0);
    02968 }