src/blitter/8bpp_simple.cpp

   1 /* $Id$ */
   2
   3 /*
   4  * This file is part of OpenTTD.
   5  * 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.
   6  * 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.
   7  * 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/>.
   8  */
   9
  10 /** @file 8bpp_simple.cpp Implementation of the simple 8 bpp blitter. */
  11
  12 #include "../stdafx.h"
  13 #include "../zoom_func.h"
  14 #include "8bpp_simple.hpp"
  15
  16 #include "../safeguards.h"
  17
  18 /** Instantiation of the simple 8bpp blitter factory. */
  19 static FBlitter_8bppSimple iFBlitter_8bppSimple;
  20
  21 void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
  22 {
  23         const uint8 *src, *src_line;
  24         uint8 *dst, *dst_line;
  25
  26         /* Find where to start reading in the source sprite */
  27         src_line = (const uint8 *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  28         dst_line = (uint8 *)bp->dst + bp->top * bp->pitch + bp->left;
  29
  30         for (int y = 0; y < bp->height; y++) {
  31                 dst = dst_line;
  32                 dst_line += bp->pitch;
  33
  34                 src = src_line;
  35                 src_line += bp->sprite_width * ScaleByZoom(1, zoom);
  36
  37                 for (int x = 0; x < bp->width; x++) {
  38                         uint colour = 0;
  39
  40                         switch (mode) {
  41                                 case BM_COLOUR_REMAP:
  42                                 case BM_CRASH_REMAP:
  43                                         colour = bp->remap[*src];
  44                                         break;
  45
  46                                 case BM_TRANSPARENT:
  47                                         if (*src != 0) colour = bp->remap[*dst];
  48                                         break;
  49
  50                                 case BM_BLACK_REMAP:
  51                                         if (*src != 0) *dst = 0;
  52                                         break;
  53
  54                                 default:
  55                                         colour = *src;
  56                                         break;
  57                         }
  58                         if (colour != 0) *dst = colour;
  59                         dst++;
  60                         src += ScaleByZoom(1, zoom);
  61                 }
  62         }
  63 }
  64
  65 Sprite *Blitter_8bppSimple::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
  66 {
  67         Sprite *dest_sprite;
  68         dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + (size_t)sprite->height * (size_t)sprite->width);
  69
  70         dest_sprite->height = sprite->height;
  71         dest_sprite->width  = sprite->width;
  72         dest_sprite->x_offs = sprite->x_offs;
  73         dest_sprite->y_offs = sprite->y_offs;
  74
  75         /* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
  76         for (int i = 0; i < sprite->height * sprite->width; i++) {
  77                 dest_sprite->data[i] = sprite->data[i].m;
  78         }
  79
  80         return dest_sprite;
  81 }