src/blitter/8bpp_simple.cpp

   1 /*
   2  * This file is part of OpenTTD.
   3  * 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.
   4  * 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.
   5  * 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/>.
   6  */
   7
   8 /** @file 8bpp_simple.cpp Implementation of the simple 8 bpp blitter. */
   9
  10 #include "../stdafx.h"
  11 #include "../zoom_func.h"
  12 #include "8bpp_simple.hpp"
  13
  14 #include "../safeguards.h"
  15
  16 /** Instantiation of the simple 8bpp blitter factory. */
  17 static FBlitter_8bppSimple iFBlitter_8bppSimple;
  18
  19 void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
  20 {
  21         const uint8 *src, *src_line;
  22         uint8 *dst, *dst_line;
  23
  24         /* Find where to start reading in the source sprite */
  25         src_line = (const uint8 *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  26         dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left;
  27
  28         for (int y = 0; y < bp->height; y++) {
  29                 dst = dst_line;
  30                 dst_line += bp->pitch;
  31
  32                 src = src_line;
  33                 src_line += bp->sprite_width * ScaleByZoom(1, zoom);
  34
  35                 for (int x = 0; x < bp->width; x++) {
  36                         uint colour = 0;
  37
  38                         switch (mode) {
  39                                 case BM_COLOUR_REMAP:
  40                                 case BM_CRASH_REMAP:
  41                                         colour = bp->remap[*src];
  42                                         break;
  43
  44                                 case BM_TRANSPARENT:
  45                                         if (*src != 0) colour = bp->remap[*dst];
  46                                         break;
  47
  48                                 case BM_BLACK_REMAP:
  49                                         if (*src != 0) *dst = 0;
  50                                         break;
  51
  52                                 default:
  53                                         colour = *src;
  54                                         break;
  55                         }
  56                         if (colour != 0) *dst = colour;
  57                         dst++;
  58                         src += ScaleByZoom(1, zoom);
  59                 }
  60         }
  61 }
  62
  63 Sprite *Blitter_8bppSimple::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
  64 {
  65         Sprite *dest_sprite;
  66         dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + (size_t)sprite->height * (size_t)sprite->width);
  67
  68         dest_sprite->height = sprite->height;
  69         dest_sprite->width  = sprite->width;
  70         dest_sprite->x_offs = sprite->x_offs;
  71         dest_sprite->y_offs = sprite->y_offs;
  72
  73         /* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
  74         for (int i = 0; i < sprite->height * sprite->width; i++) {
  75                 dest_sprite->data[i] = sprite->data[i].m;
  76         }
  77
  78         return dest_sprite;
  79 }