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 "../palette_func.h"
  13 #include "32bpp_simple.hpp"
  14
  15 #include "../table/sprites.h"
  16
  17 #include "../safeguards.h"
  18
  19 /** Instantiation of the simple 32bpp blitter factory. */
  20 static FBlitter_32bppSimple iFBlitter_32bppSimple;
  21
  22 void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
  23 {
  24         const Blitter_32bppSimple::Pixel *src, *src_line;
  25         Colour *dst, *dst_line;
  26
  27         /* Find where to start reading in the source sprite */
  28         src_line = (const Blitter_32bppSimple::Pixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
  29         dst_line = (Colour *)bp->dst + bp->top * bp->pitch + bp->left;
  30
  31         for (int y = 0; y < bp->height; y++) {
  32                 dst = dst_line;
  33                 dst_line += bp->pitch;
  34
  35                 src = src_line;
  36                 src_line += bp->sprite_width * ScaleByZoom(1, zoom);
  37
  38                 for (int x = 0; x < bp->width; x++) {
  39                         switch (mode) {
  40                                 case BM_COLOUR_REMAP:
  41                                         /* In case the m-channel is zero, do not remap this pixel in any way */
  42                                         if (src->m == 0) {
  43                                                 if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
  44                                         } else {
  45                                                 if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
  46                                         }
  47                                         break;
  48
  49                                 case BM_CRASH_REMAP:
  50                                         if (src->m == 0) {
  51                                                 if (src->a != 0) {
  52                                                         uint8_t g = MakeDark(src->r, src->g, src->b);
  53                                                         *dst = ComposeColourRGBA(g, g, g, src->a, *dst);
  54                                                 }
  55                                         } else {
  56                                                 if (bp->remap[src->m] != 0) *dst = ComposeColourPA(this->AdjustBrightness(this->LookupColourInPalette(bp->remap[src->m]), src->v), src->a, *dst);
  57                                         }
  58                                         break;
  59
  60                                 case BM_BLACK_REMAP:
  61                                         if (src->a != 0) {
  62                                                 *dst = Colour(0, 0, 0);
  63                                         }
  64                                         break;
  65
  66                                 case BM_TRANSPARENT:
  67                                         /* Make the current colour a bit more black, so it looks like this image is transparent */
  68                                         if (src->a != 0) {
  69                                                 *dst = MakeTransparent(*dst, 192);
  70                                         }
  71                                         break;
  72
  73                                 case BM_TRANSPARENT_REMAP:
  74                                         /* Apply custom transparency remap. */
  75                                         if (src->a != 0) {
  76                                                 *dst = this->LookupColourInPalette(bp->remap[GetNearestColourIndex(*dst)]);
  77                                         }
  78                                         break;
  79
  80                                 default:
  81                                         if (src->a != 0) *dst = ComposeColourRGBA(src->r, src->g, src->b, src->a, *dst);
  82                                         break;
  83                         }
  84                         dst++;
  85                         src += ScaleByZoom(1, zoom);
  86                 }
  87         }
  88 }
  89
  90 void Blitter_32bppSimple::DrawColourMappingRect(void *dst, int width, int height, PaletteID pal)
  91 {
  92         Colour *udst = (Colour *)dst;
  93
  94         if (pal == PALETTE_TO_TRANSPARENT) {
  95                 do {
  96                         for (int i = 0; i != width; i++) {
  97                                 *udst = MakeTransparent(*udst, 154);
  98                                 udst++;
  99                         }
 100                         udst = udst - width + _screen.pitch;
 101                 } while (--height);
 102                 return;
 103         }
 104         if (pal == PALETTE_NEWSPAPER) {
 105                 do {
 106                         for (int i = 0; i != width; i++) {
 107                                 *udst = MakeGrey(*udst);
 108                                 udst++;
 109                         }
 110                         udst = udst - width + _screen.pitch;
 111                 } while (--height);
 112                 return;
 113         }
 114
 115         Debug(misc, 0, "32bpp blitter doesn't know how to draw this colour table ('{}')", pal);
 116 }
 117
 118 Sprite *Blitter_32bppSimple::Encode(const SpriteLoader::SpriteCollection &sprite, SpriteAllocator &allocator)
 119 {
 120         Blitter_32bppSimple::Pixel *dst;
 121         Sprite *dest_sprite = allocator.Allocate<Sprite>(sizeof(*dest_sprite) + static_cast<size_t>(sprite[ZOOM_LVL_MIN].height) * static_cast<size_t>(sprite[ZOOM_LVL_MIN].width) * sizeof(*dst));
 122
 123         dest_sprite->height = sprite[ZOOM_LVL_MIN].height;
 124         dest_sprite->width  = sprite[ZOOM_LVL_MIN].width;
 125         dest_sprite->x_offs = sprite[ZOOM_LVL_MIN].x_offs;
 126         dest_sprite->y_offs = sprite[ZOOM_LVL_MIN].y_offs;
 127
 128         dst = (Blitter_32bppSimple::Pixel *)dest_sprite->data;
 129         SpriteLoader::CommonPixel *src = (SpriteLoader::CommonPixel *)sprite[ZOOM_LVL_MIN].data;
 130
 131         for (int i = 0; i < sprite[ZOOM_LVL_MIN].height * sprite[ZOOM_LVL_MIN].width; i++) {
 132                 if (src->m == 0) {
 133                         dst[i].r = src->r;
 134                         dst[i].g = src->g;
 135                         dst[i].b = src->b;
 136                         dst[i].a = src->a;
 137                         dst[i].m = 0;
 138                         dst[i].v = 0;
 139                 } else {
 140                         /* Get brightest value */
 141                         uint8_t rgb_max = std::max({src->r, src->g, src->b});
 142
 143                         /* Black pixel (8bpp or old 32bpp image), so use default value */
 144                         if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
 145                         dst[i].v = rgb_max;
 146
 147                         /* Pre-convert the mapping channel to a RGB value */
 148                         Colour colour = this->AdjustBrightness(this->LookupColourInPalette(src->m), dst[i].v);
 149                         dst[i].r = colour.r;
 150                         dst[i].g = colour.g;
 151                         dst[i].b = colour.b;
 152                         dst[i].a = src->a;
 153                         dst[i].m = src->m;
 154                 }
 155                 src++;
 156         }
 157
 158         return dest_sprite;
 159 }