src/blitter/32bpp_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 32bpp_simple.cpp Implementation of the simple 32 bpp blitter. */
  11
  12 #include "../stdafx.h"
  13 #include "../zoom_func.h"
  14 #include "32bpp_simple.hpp"
  15
  16 #include "../table/sprites.h"
  17
  18 #include "../safeguards.h"
  19
  20 /** Instantiation of the simple 32bpp blitter factory. */
  21 static FBlitter_32bppSimple iFBlitter_32bppSimple;
  22
  23 void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
  24 {
  25         const Blitter_32bppSimple::Pixel *src, *src_line;
  26         Colour *dst, *dst_line;
  27
  28         /* Find where to start reading in the source sprite */
  29         src_line = (const Blitter_32bppSimple::Pixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  30         dst_line = (Colour *)bp->dst + bp->top * bp->pitch + bp->left;
  31
  32         for (int y = 0; y < bp->height; y++) {
  33                 dst = dst_line;
  34                 dst_line += bp->pitch;
  35
  36                 src = src_line;
  37                 src_line += bp->sprite_width * ScaleByZoom(1, zoom);
  38
  39                 for (int x = 0; x < bp->width; x++) {
  40                         switch (mode) {
  41                                 case BM_COLOUR_REMAP:
  42                                         /* In case the m-channel is zero, do not remap this pixel in any way */
  43                                         if (src->m == 0) {
  44                                                 if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
  45                                         } else {
  46                                                 if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
  47                                         }
  48                                         break;
  49
  50                                 case BM_CRASH_REMAP:
  51                                         if (src->m == 0) {
  52                                                 if (src->a != 0) {
  53                                                         uint8 g = MakeDark(src->r, src->g, src->b);
  54                                                         *dst = ComposeColourRGBA(g, g, g, src->a, *dst);
  55                                                 }
  56                                         } else {
  57                                                 if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
  58                                         }
  59                                         break;
  60
  61                                 case BM_BLACK_REMAP:
  62                                         if (src->a != 0) {
  63                                                 *dst = Colour(0, 0, 0);
  64                                         }
  65                                         break;
  66
  67                                 case BM_TRANSPARENT:
  68                                         /* TODO -- We make an assumption here that the remap in fact is transparency, not some colour.
  69                                          *  This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
  70                                          *  we produce a result the newgrf maker didn't expect ;) */
  71
  72                                         /* Make the current colour a bit more black, so it looks like this image is transparent */
  73                                         if (src->a != 0) *dst = MakeTransparent(*dst, 192);
  74                                         break;
  75
  76                                 default:
  77                                         if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
  78                                         break;
  79                         }
  80                         dst++;
  81                         src += ScaleByZoom(1, zoom);
  82                 }
  83         }
  84 }
  85
  86 void Blitter_32bppSimple::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
  87 {
  88         Colour *udst = (Colour *)dst;
  89
  90         if (pal == PALETTE_TO_TRANSPARENT) {
  91                 do {
  92                         for (int i = 0; i != width; i++) {
  93                                 *udst = MakeTransparent(*udst, 154);
  94                                 udst++;
  95                         }
  96                         udst = udst - width + _screen.pitch;
  97                 } while (--height);
  98                 return;
  99         }
 100         if (pal == PALETTE_NEWSPAPER) {
 101                 do {
 102                         for (int i = 0; i != width; i++) {
 103                                 *udst = MakeGrey(*udst);
 104                                 udst++;
 105                         }
 106                         udst = udst - width + _screen.pitch;
 107                 } while (--height);
 108                 return;
 109         }
 110
 111         DEBUG(misc, 0, "32bpp blitter doesn't know how to draw this colour table ('%d')", pal);
 112 }
 113
 114 Sprite *Blitter_32bppSimple::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
 115 {
 116         Blitter_32bppSimple::Pixel *dst;
 117         Sprite *dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + (size_t)sprite->height * (size_t)sprite->width * sizeof(*dst));
 118
 119         dest_sprite->height = sprite->height;
 120         dest_sprite->width  = sprite->width;
 121         dest_sprite->x_offs = sprite->x_offs;
 122         dest_sprite->y_offs = sprite->y_offs;
 123
 124         dst = (Blitter_32bppSimple::Pixel *)dest_sprite->data;
 125         SpriteLoader::CommonPixel *src = (SpriteLoader::CommonPixel *)sprite->data;
 126
 127         for (int i = 0; i < sprite->height * sprite->width; i++) {
 128                 if (src->m == 0) {
 129                         dst[i].r = src->r;
 130                         dst[i].g = src->g;
 131                         dst[i].b = src->b;
 132                         dst[i].a = src->a;
 133                         dst[i].m = 0;
 134                         dst[i].v = 0;
 135                 } else {
 136                         /* Get brightest value */
 137                         uint8 rgb_max = max(src->r, max(src->g, src->b));
 138
 139                         /* Black pixel (8bpp or old 32bpp image), so use default value */
 140                         if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
 141                         dst[i].v = rgb_max;
 142
 143                         /* Pre-convert the mapping channel to a RGB value */
 144                         Colour colour = this->AdjustBrightness(this->LookupColourInPalette(src->m), dst[i].v);
 145                         dst[i].r = colour.r;
 146                         dst[i].g = colour.g;
 147                         dst[i].b = colour.b;
 148                         dst[i].a = src->a;
 149                         dst[i].m = src->m;
 150                 }
 151                 src++;
 152         }
 153
 154         return dest_sprite;
 155 }