# heightmap.cpp

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    00001 /* $Id: heightmap.cpp 15428 2009-02-09 02:57:15Z rubidium $ */
    00002
    00005 #include "stdafx.h"
    00006 #include "heightmap.h"
    00007 #include "clear_map.h"
    00008 #include "void_map.h"
    00009 #include "gui.h"
    00010 #include "saveload/saveload.h"
    00011 #include "bmp.h"
    00012 #include "gfx_func.h"
    00013 #include "fios.h"
    00014 #include "settings_type.h"
    00015
    00016 #include "table/strings.h"
    00017
    00023 static inline byte RGBToGrayscale(byte red, byte green, byte blue)
    00024 {
    00025   /* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then
    00026    *  divide by it to normalize the value to a byte again. */
    00027   return ((red * 19595) + (green * 38470) + (blue * 7471)) / 65536;
    00028 }
    00029
    00030
    00031 #ifdef WITH_PNG
    00032
    00033 #include <png.h>
    00034
    00038 static void ReadHeightmapPNGImageData(byte *map, png_structp png_ptr, png_infop info_ptr)
    00039 {
    00040   uint x, y;
    00041   byte gray_palette[256];
    00042   png_bytep *row_pointers = NULL;
    00043
    00044   /* Get palette and convert it to grayscale */
    00045   if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) {
    00046     int i;
    00047     int palette_size;
    00048     png_color *palette;
    00049     bool all_gray = true;
    00050
    00051     png_get_PLTE(png_ptr, info_ptr, &palette, &palette_size);
    00052     for (i = 0; i < palette_size && (palette_size != 16 || all_gray); i++) {
    00053       all_gray &= palette[i].red == palette[i].green && palette[i].red == palette[i].blue;
    00054       gray_palette[i] = RGBToGrayscale(palette[i].red, palette[i].green, palette[i].blue);
    00055     }
    00056
    00063     if (palette_size == 16 && !all_gray) {
    00064       for (i = 0; i < palette_size; i++) {
    00065         gray_palette[i] = 256 * i / palette_size;
    00066       }
    00067     }
    00068   }
    00069
    00070   row_pointers = png_get_rows(png_ptr, info_ptr);
    00071
    00072   /* Read the raw image data and convert in 8-bit grayscale */
    00073   for (x = 0; x < info_ptr->width; x++) {
    00074     for (y = 0; y < info_ptr->height; y++) {
    00075       byte *pixel = &map[y * info_ptr->width + x];
    00076       uint x_offset = x * info_ptr->channels;
    00077
    00078       if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE) {
    00079         *pixel = gray_palette[row_pointers[y][x_offset]];
    00080       } else if (info_ptr->channels == 3) {
    00081         *pixel = RGBToGrayscale(row_pointers[y][x_offset + 0],
    00082             row_pointers[y][x_offset + 1], row_pointers[y][x_offset + 2]);
    00083       } else {
    00084         *pixel = row_pointers[y][x_offset];
    00085       }
    00086     }
    00087   }
    00088 }
    00089
    00095 static bool ReadHeightmapPNG(char *filename, uint *x, uint *y, byte **map)
    00096 {
    00097   FILE *fp;
    00098   png_structp png_ptr = NULL;
    00099   png_infop info_ptr  = NULL;
    00100
    00101   fp = fopen(filename, "rb");
    00102   if (fp == NULL) {
    00103     ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_PNGMAP_ERROR, 0, 0);
    00104     return false;
    00105   }
    00106
    00107   png_ptr = png_create_read_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
    00108   if (png_ptr == NULL) {
    00109     ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);
    00110     fclose(fp);
    00111     return false;
    00112   }
    00113
    00114   info_ptr = png_create_info_struct(png_ptr);
    00115   if (info_ptr == NULL || setjmp(png_jmpbuf(png_ptr))) {
    00116     ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);
    00117     fclose(fp);
    00118     png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
    00119     return false;
    00120   }
    00121
    00122   png_init_io(png_ptr, fp);
    00123
    00124   /* Allocate memory and read image, without alpha or 16-bit samples
    00125    * (result is either 8-bit indexed/grayscale or 24-bit RGB) */
    00126   png_set_packing(png_ptr);
    00127   png_read_png(png_ptr, info_ptr, PNG_TRANSFORM_PACKING | PNG_TRANSFORM_STRIP_ALPHA | PNG_TRANSFORM_STRIP_16, NULL);
    00128
    00129   /* Maps of wrong colour-depth are not used.
    00130    * (this should have been taken care of by stripping alpha and 16-bit samples on load) */
    00131   if ((info_ptr->channels != 1) && (info_ptr->channels != 3) && (info_ptr->bit_depth != 8)) {
    00132     ShowErrorMessage(STR_PNGMAP_ERR_IMAGE_TYPE, STR_PNGMAP_ERROR, 0, 0);
    00133     fclose(fp);
    00134     png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
    00135     return false;
    00136   }
    00137
    00138   if (map != NULL) {
    00139     *map = MallocT<byte>(info_ptr->width * info_ptr->height);
    00140
    00141     if (*map == NULL) {
    00142       ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_PNGMAP_ERROR, 0, 0);
    00143       fclose(fp);
    00144       png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
    00145       return false;
    00146     }
    00147
    00148     ReadHeightmapPNGImageData(*map, png_ptr, info_ptr);
    00149   }
    00150
    00151   *x = info_ptr->width;
    00152   *y = info_ptr->height;
    00153
    00154   fclose(fp);
    00155   png_destroy_read_struct(&png_ptr, &info_ptr, NULL);
    00156   return true;
    00157 }
    00158
    00159 #endif /* WITH_PNG */
    00160
    00161
    00165 static void ReadHeightmapBMPImageData(byte *map, BmpInfo *info, BmpData *data)
    00166 {
    00167   uint x, y;
    00168   byte gray_palette[256];
    00169
    00170   if (data->palette != NULL) {
    00171     uint i;
    00172     bool all_gray = true;
    00173
    00174     if (info->palette_size != 2) {
    00175       for (i = 0; i < info->palette_size && (info->palette_size != 16 || all_gray); i++) {
    00176         all_gray &= data->palette[i].r == data->palette[i].g && data->palette[i].r == data->palette[i].b;
    00177         gray_palette[i] = RGBToGrayscale(data->palette[i].r, data->palette[i].g, data->palette[i].b);
    00178       }
    00179
    00186       if (info->palette_size == 16 && !all_gray) {
    00187         for (i = 0; i < info->palette_size; i++) {
    00188           gray_palette[i] = 256 * i / info->palette_size;
    00189         }
    00190       }
    00191     } else {
    00196       gray_palette[0] = 0;
    00197       gray_palette[1] = 16;
    00198     }
    00199   }
    00200
    00201   /* Read the raw image data and convert in 8-bit grayscale */
    00202   for (y = 0; y < info->height; y++) {
    00203     byte *pixel = &map[y * info->width];
    00204     byte *bitmap = &data->bitmap[y * info->width * (info->bpp == 24 ? 3 : 1)];
    00205
    00206     for (x = 0; x < info->width; x++) {
    00207       if (info->bpp != 24) {
    00208         *pixel++ = gray_palette[*bitmap++];
    00209       } else {
    00210         *pixel++ = RGBToGrayscale(*bitmap, *(bitmap + 1), *(bitmap + 2));
    00211         bitmap += 3;
    00212       }
    00213     }
    00214   }
    00215 }
    00216
    00222 static bool ReadHeightmapBMP(char *filename, uint *x, uint *y, byte **map)
    00223 {
    00224   FILE *f;
    00225   BmpInfo info;
    00226   BmpData data;
    00227   BmpBuffer buffer;
    00228
    00229   /* Init BmpData */
    00230   memset(&data, 0, sizeof(data));
    00231
    00232   f = fopen(filename, "rb");
    00233   if (f == NULL) {
    00234     ShowErrorMessage(STR_PNGMAP_ERR_FILE_NOT_FOUND, STR_BMPMAP_ERROR, 0, 0);
    00235     return false;
    00236   }
    00237
    00238   BmpInitializeBuffer(&buffer, f);
    00239
    00240   if (!BmpReadHeader(&buffer, &info, &data)) {
    00241     ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0);
    00242     fclose(f);
    00243     BmpDestroyData(&data);
    00244     return false;
    00245   }
    00246
    00247   if (map != NULL) {
    00248     if (!BmpReadBitmap(&buffer, &info, &data)) {
    00249       ShowErrorMessage(STR_BMPMAP_ERR_IMAGE_TYPE, STR_BMPMAP_ERROR, 0, 0);
    00250       fclose(f);
    00251       BmpDestroyData(&data);
    00252       return false;
    00253     }
    00254
    00255     *map = MallocT<byte>(info.width * info.height);
    00256     if (*map == NULL) {
    00257       ShowErrorMessage(STR_PNGMAP_ERR_MISC, STR_BMPMAP_ERROR, 0, 0);
    00258       fclose(f);
    00259       BmpDestroyData(&data);
    00260       return false;
    00261     }
    00262
    00263     ReadHeightmapBMPImageData(*map, &info, &data);
    00264
    00265   }
    00266
    00267   BmpDestroyData(&data);
    00268
    00269   *x = info.width;
    00270   *y = info.height;
    00271
    00272   fclose(f);
    00273   return true;
    00274 }
    00275
    00283 static void GrayscaleToMapHeights(uint img_width, uint img_height, byte *map)
    00284 {
    00285   /* Defines the detail of the aspect ratio (to avoid doubles) */
    00286   const uint num_div = 16384;
    00287
    00288   uint width, height;
    00289   uint row, col;
    00290   uint row_pad = 0, col_pad = 0;
    00291   uint img_scale;
    00292   uint img_row, img_col;
    00293   TileIndex tile;
    00294
    00295   /* Get map size and calculate scale and padding values */
    00296   switch (_settings_game.game_creation.heightmap_rotation) {
    00297     default: NOT_REACHED();
    00298     case HM_COUNTER_CLOCKWISE:
    00299       width   = MapSizeX();
    00300       height  = MapSizeY();
    00301       break;
    00302     case HM_CLOCKWISE:
    00303       width   = MapSizeY();
    00304       height  = MapSizeX();
    00305       break;
    00306   }
    00307
    00308   if ((img_width * num_div) / img_height > ((width * num_div) / height)) {
    00309     /* Image is wider than map - center vertically */
    00310     img_scale = (width * num_div) / img_width;
    00311     row_pad = (1 + height - ((img_height * img_scale) / num_div)) / 2;
    00312   } else {
    00313     /* Image is taller than map - center horizontally */
    00314     img_scale = (height * num_div) / img_height;
    00315     col_pad = (1 + width - ((img_width * img_scale) / num_div)) / 2;
    00316   }
    00317
    00318   if (_settings_game.construction.freeform_edges) {
    00319     for (uint x = 0; x < MapSizeX(); x++) MakeVoid(TileXY(x, 0));
    00320     for (uint y = 0; y < MapSizeY(); y++) MakeVoid(TileXY(0, y));
    00321   }
    00322
    00323   /* Form the landscape */
    00324   for (row = 0; row < height; row++) {
    00325     for (col = 0; col < width; col++) {
    00326       switch (_settings_game.game_creation.heightmap_rotation) {
    00327         default: NOT_REACHED();
    00328         case HM_COUNTER_CLOCKWISE: tile = TileXY(col, row); break;
    00329         case HM_CLOCKWISE:         tile = TileXY(row, col); break;
    00330       }
    00331
    00332       /* Check if current tile is within the 1-pixel map edge or padding regions */
    00333       if ((!_settings_game.construction.freeform_edges && DistanceFromEdge(tile) <= 1) ||
    00334           (row < row_pad) || (row >= (height - row_pad - (_settings_game.construction.freeform_edges ? 0 : 1))) ||
    00335           (col < col_pad) || (col >= (width  - col_pad - (_settings_game.construction.freeform_edges ? 0 : 1)))) {
    00336         SetTileHeight(tile, 0);
    00337       } else {
    00338         /* Use nearest neighbor resizing to scale map data.
    00339          *  We rotate the map 45 degrees (counter)clockwise */
    00340         img_row = (((row - row_pad) * num_div) / img_scale);
    00341         switch (_settings_game.game_creation.heightmap_rotation) {
    00342           default: NOT_REACHED();
    00343           case HM_COUNTER_CLOCKWISE:
    00344             img_col = (((width - 1 - col - col_pad) * num_div) / img_scale);
    00345             break;
    00346           case HM_CLOCKWISE:
    00347             img_col = (((col - col_pad) * num_div) / img_scale);
    00348             break;
    00349         }
    00350
    00351         assert(img_row < img_height);
    00352         assert(img_col < img_width);
    00353
    00354         /* Colour scales from 0 to 255, OpenTTD height scales from 0 to 15 */
    00355         SetTileHeight(tile, map[img_row * img_width + img_col] / 16);
    00356       }
    00357       /* Only clear the tiles within the map area. */
    00358       if (TileX(tile) != MapMaxX() && TileY(tile) != MapMaxY() &&
    00359           (!_settings_game.construction.freeform_edges || (TileX(tile) != 0 && TileY(tile) != 0))) {
    00360         MakeClear(tile, CLEAR_GRASS, 3);
    00361       }
    00362     }
    00363   }
    00364 }
    00365
    00370 static void FixSlopes()
    00371 {
    00372   uint width, height;
    00373   int row, col;
    00374   byte current_tile;
    00375
    00376   /* Adjust height difference to maximum one horizontal/vertical change. */
    00377   width   = MapSizeX();
    00378   height  = MapSizeY();
    00379
    00380   /* Top and left edge */
    00381   for (row = 0; (uint)row < height; row++) {
    00382     for (col = 0; (uint)col < width; col++) {
    00383       current_tile = MAX_TILE_HEIGHT;
    00384       if (col != 0) {
    00385         /* Find lowest tile; either the top or left one */
    00386         current_tile = TileHeight(TileXY(col - 1, row)); // top edge
    00387       }
    00388       if (row != 0) {
    00389         if (TileHeight(TileXY(col, row - 1)) < current_tile) {
    00390           current_tile = TileHeight(TileXY(col, row - 1)); // left edge
    00391         }
    00392       }
    00393
    00394       /* Does the height differ more than one? */
    00395       if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) {
    00396         /* Then change the height to be no more than one */
    00397         SetTileHeight(TileXY(col, row), current_tile + 1);
    00398       }
    00399     }
    00400   }
    00401
    00402   /* Bottom and right edge */
    00403   for (row = height - 1; row >= 0; row--) {
    00404     for (col = width - 1; col >= 0; col--) {
    00405       current_tile = MAX_TILE_HEIGHT;
    00406       if ((uint)col != width - 1) {
    00407         /* Find lowest tile; either the bottom and right one */
    00408         current_tile = TileHeight(TileXY(col + 1, row)); // bottom edge
    00409       }
    00410
    00411       if ((uint)row != height - 1) {
    00412         if (TileHeight(TileXY(col, row + 1)) < current_tile) {
    00413           current_tile = TileHeight(TileXY(col, row + 1)); // right edge
    00414         }
    00415       }
    00416
    00417       /* Does the height differ more than one? */
    00418       if (TileHeight(TileXY(col, row)) >= (uint)current_tile + 2) {
    00419         /* Then change the height to be no more than one */
    00420         SetTileHeight(TileXY(col, row), current_tile + 1);
    00421       }
    00422     }
    00423   }
    00424 }
    00425
    00429 static bool ReadHeightMap(char *filename, uint *x, uint *y, byte **map)
    00430 {
    00431   switch (_file_to_saveload.mode) {
    00432     default: NOT_REACHED();
    00433 #ifdef WITH_PNG
    00434     case SL_PNG:
    00435       return ReadHeightmapPNG(filename, x, y, map);
    00436 #endif /* WITH_PNG */
    00437     case SL_BMP:
    00438       return ReadHeightmapBMP(filename, x, y, map);
    00439   }
    00440 }
    00441
    00442 bool GetHeightmapDimensions(char *filename, uint *x, uint *y)
    00443 {
    00444   return ReadHeightMap(filename, x, y, NULL);
    00445 }
    00446
    00447 void LoadHeightmap(char *filename)
    00448 {
    00449   uint x, y;
    00450   byte *map = NULL;
    00451
    00452   if (!ReadHeightMap(filename, &x, &y, &map)) {
    00453     free(map);
    00454     return;
    00455   }
    00456
    00457   GrayscaleToMapHeights(x, y, map);
    00458   free(map);
    00459
    00460   FixSlopes();
    00461   MarkWholeScreenDirty();
    00462 }
    00463
    00464 void FlatEmptyWorld(byte tile_height)
    00465 {
    00466   int edge_distance = _settings_game.construction.freeform_edges ? 0 : 2;
    00467   for (uint row = edge_distance; row < MapSizeY() - edge_distance; row++) {
    00468     for (uint col = edge_distance; col < MapSizeX() - edge_distance; col++) {
    00469       SetTileHeight(TileXY(col, row), tile_height);
    00470     }
    00471   }
    00472
    00473   FixSlopes();
    00474   MarkWholeScreenDirty();
    00475 }