src/blitter/32bpp_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 32bpp_simple.cpp Implementation of the simple 32 bpp blitter. */
   9
  10 #include "../stdafx.h"
  11 #include "../zoom_func.h"
  12 #include "32bpp_simple.hpp"
  13
  14 #include "../table/sprites.h"
  15
  16 #include "../safeguards.h"
  17
  18 /** Instantiation of the simple 32bpp blitter factory. */
  19 static FBlitter_32bppSimple iFBlitter_32bppSimple;
  20
  21 void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
  22 {
  23         const Blitter_32bppSimple::Pixel *src, *src_line;
  24         Colour *dst, *dst_line;
  25
  26         /* Find where to start reading in the source sprite */
  27         src_line = (const Blitter_32bppSimple::Pixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  28         dst_line = (Colour *)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                         switch (mode) {
  39                                 case BM_COLOUR_REMAP:
  40                                         /* In case the m-channel is zero, do not remap this pixel in any way */
  41                                         if (src->m == 0) {
  42                                                 if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
  43                                         } else {
  44                                                 if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
  45                                         }
  46                                         break;
  47
  48                                 case BM_CRASH_REMAP:
  49                                         if (src->m == 0) {
  50                                                 if (src->a != 0) {
  51                                                         uint8 g = MakeDark(src->r, src->g, src->b);
  52                                                         *dst = ComposeColourRGBA(g, g, g, src->a, *dst);
  53                                                 }
  54                                         } else {
  55                                                 if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
  56                                         }
  57                                         break;
  58
  59                                 case BM_BLACK_REMAP:
  60                                         if (src->a != 0) {
  61                                                 *dst = Colour(0, 0, 0);
  62                                         }
  63                                         break;
  64
  65                                 case BM_TRANSPARENT:
  66                                         /* TODO -- We make an assumption here that the remap in fact is transparency, not some colour.
  67                                          *  This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
  68                                          *  we produce a result the newgrf maker didn't expect ;) */
  69
  70                                         /* Make the current colour a bit more black, so it looks like this image is transparent */
  71                                         if (src->a != 0) *dst = MakeTransparent(*dst, 192);
  72                                         break;
  73
  74                                 default:
  75                                         if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
  76                                         break;
  77                         }
  78                         dst++;
  79                         src += ScaleByZoom(1, zoom);
  80                 }
  81         }
  82 }
  83
  84 void Blitter_32bppSimple::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
  85 {
  86         Colour *udst = (Colour *)dst;
  87
  88         if (pal == PALETTE_TO_TRANSPARENT) {
  89                 do {
  90                         for (int i = 0; i != width; i++) {
  91                                 *udst = MakeTransparent(*udst, 154);
  92                                 udst++;
  93                         }
  94                         udst = udst - width + _screen.pitch;
  95                 } while (--height);
  96                 return;
  97         }
  98         if (pal == PALETTE_NEWSPAPER) {
  99                 do {
 100                         for (int i = 0; i != width; i++) {
 101                                 *udst = MakeGrey(*udst);
 102                                 udst++;
 103                         }
 104                         udst = udst - width + _screen.pitch;
 105                 } while (--height);
 106                 return;
 107         }
 108
 109         DEBUG(misc, 0, "32bpp blitter doesn't know how to draw this colour table ('%d')", pal);
 110 }
 111
 112 Sprite *Blitter_32bppSimple::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
 113 {
 114         Blitter_32bppSimple::Pixel *dst;
 115         Sprite *dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + (size_t)sprite->height * (size_t)sprite->width * sizeof(*dst));
 116
 117         dest_sprite->height = sprite->height;
 118         dest_sprite->width  = sprite->width;
 119         dest_sprite->x_offs = sprite->x_offs;
 120         dest_sprite->y_offs = sprite->y_offs;
 121
 122         dst = (Blitter_32bppSimple::Pixel *)dest_sprite->data;
 123         SpriteLoader::CommonPixel *src = (SpriteLoader::CommonPixel *)sprite->data;
 124
 125         for (int i = 0; i < sprite->height * sprite->width; i++) {
 126                 if (src->m == 0) {
 127                         dst[i].r = src->r;
 128                         dst[i].g = src->g;
 129                         dst[i].b = src->b;
 130                         dst[i].a = src->a;
 131                         dst[i].m = 0;
 132                         dst[i].v = 0;
 133                 } else {
 134                         /* Get brightest value */
 135                         uint8 rgb_max = std::max({src->r, src->g, src->b});
 136
 137                         /* Black pixel (8bpp or old 32bpp image), so use default value */
 138                         if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
 139                         dst[i].v = rgb_max;
 140
 141                         /* Pre-convert the mapping channel to a RGB value */
 142                         Colour colour = this->AdjustBrightness(this->LookupColourInPalette(src->m), dst[i].v);
 143                         dst[i].r = colour.r;
 144                         dst[i].g = colour.g;
 145                         dst[i].b = colour.b;
 146                         dst[i].a = src->a;
 147                         dst[i].m = src->m;
 148                 }
 149                 src++;
 150         }
 151
 152         return dest_sprite;
 153 }