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 "../debug.h"
  14 #include "../zoom_func.h"
  15 #include "32bpp_simple.hpp"
  16
  17 #include "../table/sprites.h"
  18
  19 const char Blitter_32bppSimple::name[] = "32bpp-simple";
  20 const char Blitter_32bppSimple::desc[] = "32bpp Simple Blitter (no palette animation)";
  21
  22 void Blitter_32bppSimple::Surface::draw (const 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         const Sprite *sprite = static_cast<const Sprite*> (bp->sprite);
  29         src_line = sprite->data + (bp->skip_top * 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 += 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 (AdjustBrightness (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 (AdjustBrightness (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 ::Sprite *Blitter_32bppSimple::Encode (const RawSprite *sprite, bool is_font, AllocatorProc *allocator)
  87 {
  88         Blitter_32bppSimple::Pixel *dst;
  89         Sprite *dest_sprite = AllocateSprite<Sprite> (sprite, allocator, (size_t)sprite->height * (size_t)sprite->width * sizeof(*dst));
  90
  91         dst = dest_sprite->data;
  92         RawSprite::Pixel *src = (RawSprite::Pixel *)sprite->data;
  93
  94         for (int i = 0; i < sprite->height * sprite->width; i++) {
  95                 if (src->m == 0) {
  96                         dst[i].r = src->r;
  97                         dst[i].g = src->g;
  98                         dst[i].b = src->b;
  99                         dst[i].a = src->a;
 100                         dst[i].m = 0;
 101                         dst[i].v = 0;
 102                 } else {
 103                         /* Get brightest value */
 104                         uint8 rgb_max = max(src->r, max(src->g, src->b));
 105
 106                         /* Black pixel (8bpp or old 32bpp image), so use default value */
 107                         if (rgb_max == 0) rgb_max = DEFAULT_BRIGHTNESS;
 108                         dst[i].v = rgb_max;
 109
 110                         /* Pre-convert the mapping channel to a RGB value */
 111                         Colour colour = AdjustBrightness (LookupColourInPalette(src->m), dst[i].v);
 112                         dst[i].r = colour.r;
 113                         dst[i].g = colour.g;
 114                         dst[i].b = colour.b;
 115                         dst[i].a = src->a;
 116                         dst[i].m = src->m;
 117                 }
 118                 src++;
 119         }
 120
 121         return dest_sprite;
 122 }