# 8bpp_simple.cpp

Go to the documentation of this file.

    00001 /* $Id: 8bpp_simple.cpp 19132 2010-02-14 16:31:35Z alberth $ */
    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
    00012 #include "../stdafx.h"
    00013 #include "../zoom_func.h"
    00014 #include "8bpp_simple.hpp"
    00015
    00016 static FBlitter_8bppSimple iFBlitter_8bppSimple;
    00017
    00018 void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
    00019 {
    00020   const uint8 *src, *src_line;
    00021   uint8 *dst, *dst_line;
    00022
    00023   /* Find where to start reading in the source sprite */
    00024   src_line = (const uint8 *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
    00025   dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left;
    00026
    00027   for (int y = 0; y < bp->height; y++) {
    00028     dst = dst_line;
    00029     dst_line += bp->pitch;
    00030
    00031     src = src_line;
    00032     src_line += bp->sprite_width * ScaleByZoom(1, zoom);
    00033
    00034     for (int x = 0; x < bp->width; x++) {
    00035       uint colour = 0;
    00036
    00037       switch (mode) {
    00038         case BM_COLOUR_REMAP:
    00039           colour = bp->remap[*src];
    00040           break;
    00041
    00042         case BM_TRANSPARENT:
    00043           if (*src != 0) colour = bp->remap[*dst];
    00044           break;
    00045
    00046         default:
    00047           colour = *src;
    00048           break;
    00049       }
    00050       if (colour != 0) *dst = colour;
    00051       dst++;
    00052       src += ScaleByZoom(1, zoom);
    00053     }
    00054   }
    00055 }
    00056
    00057 Sprite *Blitter_8bppSimple::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)
    00058 {
    00059   Sprite *dest_sprite;
    00060   dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width);
    00061
    00062   dest_sprite->height = sprite->height;
    00063   dest_sprite->width  = sprite->width;
    00064   dest_sprite->x_offs = sprite->x_offs;
    00065   dest_sprite->y_offs = sprite->y_offs;
    00066
    00067   /* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
    00068   for (int i = 0; i < sprite->height * sprite->width; i++) {
    00069     dest_sprite->data[i] = sprite->data[i].m;
    00070   }
    00071
    00072   return dest_sprite;
    00073 }