OpenTTD: src/blitter/8bpp_simple.cpp Source File

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8bpp_simple.cpp
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1 /* $Id: 8bpp_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 "8bpp_simple.hpp"
15
16 #include "../safeguards.h"
17
19 static FBlitter_8bppSimple iFBlitter_8bppSimple;
20
21 void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
22 {
23 const uint8 *src, *src_line;
24 uint8 *dst, *dst_line;
25
26 /* Find where to start reading in the source sprite */
27 src_line = (const uint8 *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
28 dst_line = (uint8 *)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 uint colour = 0;
39
40 switch (mode) {
41 case BM_COLOUR_REMAP:
42 case BM_CRASH_REMAP:
43 colour = bp->remap[*src];
44 break;
45
46 case BM_TRANSPARENT:
47 if (*src != 0) colour = bp->remap[*dst];
48 break;
49
50 case BM_BLACK_REMAP:
51 colour = 0;
52 break;
53
54 default:
55 colour = *src;
56 break;
57 }
58 if (colour != 0) *dst = colour;
59 dst++;
60 src += ScaleByZoom(1, zoom);
61 }
62 }
63 }
64
65 Sprite *Blitter_8bppSimple::Encode(const SpriteLoader::Sprite *sprite, AllocatorProc *allocator)
66 {
67 Sprite *dest_sprite;
68 dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + (size_t)sprite->height * (size_t)sprite->width);
69
70 dest_sprite->height = sprite->height;
71 dest_sprite->width = sprite->width;
72 dest_sprite->x_offs = sprite->x_offs;
73 dest_sprite->y_offs = sprite->y_offs;
74
75 /* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
76 for (int i = 0; i < sprite->height * sprite->width; i++) {
77 dest_sprite->data[i] = sprite->data[i].m;
78 }
79
80 return dest_sprite;
81 }