OpenTTD
32bpp_simple.cpp
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1 /* $Id: 32bpp_simple.cpp 26969 2014-10-06 18:45:51Z rubidium $ */
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 
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 
22 
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 {
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;
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 }