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

OpenTTD Source 14.0-beta1

8bpp_simple.cpp
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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
10 #include "../stdafx.h"
11 #include "../zoom_func.h"
12 #include "8bpp_simple.hpp"
13
14 #include "../safeguards.h"
15
17 static FBlitter_8bppSimple iFBlitter_8bppSimple;
18
19 void Blitter_8bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
20 {
21 const uint8_t *src, *src_line;
22 uint8_t *dst, *dst_line;
23
24 /* Find where to start reading in the source sprite */
25 src_line = (const uint8_t *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
26 dst_line = (uint8_t *)bp->dst + bp->top * bp->pitch + bp->left;
27
28 for (int y = 0; y < bp->height; y++) {
29 dst = dst_line;
30 dst_line += bp->pitch;
31
32 src = src_line;
33 src_line += bp->sprite_width * ScaleByZoom(1, zoom);
34
35 for (int x = 0; x < bp->width; x++) {
36 uint colour = 0;
37
38 switch (mode) {
39 case BM_COLOUR_REMAP:
40 case BM_CRASH_REMAP:
41 colour = bp->remap[*src];
42 break;
43
44 case BM_TRANSPARENT:
45 case BM_TRANSPARENT_REMAP:
46 if (*src != 0) colour = bp->remap[*dst];
47 break;
48
49 case BM_BLACK_REMAP:
50 if (*src != 0) *dst = 0;
51 break;
52
53 default:
54 colour = *src;
55 break;
56 }
57 if (colour != 0) *dst = colour;
58 dst++;
59 src += ScaleByZoom(1, zoom);
60 }
61 }
62 }
63
64 Sprite *Blitter_8bppSimple::Encode(const SpriteLoader::SpriteCollection &sprite, AllocatorProc *allocator)
65 {
66 Sprite *dest_sprite;
67 dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + (size_t)sprite[ZOOM_LVL_NORMAL].height * (size_t)sprite[ZOOM_LVL_NORMAL].width);
68
69 dest_sprite->height = sprite[ZOOM_LVL_NORMAL].height;
70 dest_sprite->width = sprite[ZOOM_LVL_NORMAL].width;
71 dest_sprite->x_offs = sprite[ZOOM_LVL_NORMAL].x_offs;
72 dest_sprite->y_offs = sprite[ZOOM_LVL_NORMAL].y_offs;
73
74 /* Copy over only the 'remap' channel, as that is what we care about in 8bpp */
75 for (int i = 0; i < sprite[ZOOM_LVL_NORMAL].height * sprite[ZOOM_LVL_NORMAL].width; i++) {
76 dest_sprite->data[i] = sprite[ZOOM_LVL_NORMAL].data[i].m;
77 }
78
79 return dest_sprite;
80 }
Sprite::height
uint16_t height
Height of the sprite.
Definition: spritecache.h:18
8bpp_simple.hpp
FBlitter_8bppSimple
Factory for the most trivial 8bpp blitter.
Definition: 8bpp_simple.hpp:26
Sprite::x_offs
int16_t x_offs
Number of pixels to shift the sprite to the right.
Definition: spritecache.h:20
Blitter::BlitterParams::top
int top
The top offset in the 'dst' in pixels to start drawing.
Definition: base.hpp:43
BM_TRANSPARENT
@ BM_TRANSPARENT
Perform transparency darkening remapping.
Definition: base.hpp:20
Blitter::BlitterParams::skip_left
int skip_left
How much pixels of the source to skip on the left (based on zoom of dst)
Definition: base.hpp:36
BlitterMode
BlitterMode
The modes of blitting we can do.
Definition: base.hpp:17
Blitter::BlitterParams::width
int width
The width in pixels that needs to be drawn to dst.
Definition: base.hpp:38
Sprite::data
byte data[]
Sprite data.
Definition: spritecache.h:22
Blitter::BlitterParams::dst
void * dst
Destination buffer.
Definition: base.hpp:45
Blitter::BlitterParams::sprite_width
int sprite_width
Real width of the sprite.
Definition: base.hpp:40
ZoomLevel
ZoomLevel
All zoom levels we know.
Definition: zoom_type.h:19
Blitter::BlitterParams::pitch
int pitch
The pitch of the destination buffer.
Definition: base.hpp:46
SpriteLoader::SpriteCollection
std::array< Sprite, ZOOM_LVL_END > SpriteCollection
Type defining a collection of sprites, one for each zoom level.
Definition: spriteloader.hpp:71
Blitter::BlitterParams::sprite
const void * sprite
Pointer to the sprite how ever the encoder stored it.
Definition: base.hpp:33
Blitter_8bppSimple::Draw
void Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom) override
Draw an image to the screen, given an amount of params defined above.
Definition: 8bpp_simple.cpp:19
Blitter_8bppSimple::Encode
Sprite * Encode(const SpriteLoader::SpriteCollection &sprite, AllocatorProc *allocator) override
Convert a sprite from the loader to our own format.
Definition: 8bpp_simple.cpp:64
BM_COLOUR_REMAP
@ BM_COLOUR_REMAP
Perform a colour remapping.
Definition: base.hpp:19
Sprite::width
uint16_t width
Width of the sprite.
Definition: spritecache.h:19
iFBlitter_8bppSimple
static FBlitter_8bppSimple iFBlitter_8bppSimple
Instantiation of the simple 8bpp blitter factory.
Definition: 8bpp_simple.cpp:17
BM_CRASH_REMAP
@ BM_CRASH_REMAP
Perform a crash remapping.
Definition: base.hpp:22
BM_BLACK_REMAP
@ BM_BLACK_REMAP
Perform remapping to a completely blackened sprite.
Definition: base.hpp:23
Sprite::y_offs
int16_t y_offs
Number of pixels to shift the sprite downwards.
Definition: spritecache.h:21
Blitter::BlitterParams::left
int left
The left offset in the 'dst' in pixels to start drawing.
Definition: base.hpp:42
Blitter::BlitterParams
Parameters related to blitting.
Definition: base.hpp:32
ZOOM_LVL_NORMAL
@ ZOOM_LVL_NORMAL
The normal zoom level.
Definition: zoom_type.h:22
Blitter::BlitterParams::height
int height
The height in pixels that needs to be drawn to dst.
Definition: base.hpp:39
Blitter::BlitterParams::skip_top
int skip_top
How much pixels of the source to skip on the top (based on zoom of dst)
Definition: base.hpp:37
ScaleByZoom
int ScaleByZoom(int value, ZoomLevel zoom)
Scale by zoom level, usually shift left (when zoom > ZOOM_LVL_NORMAL) When shifting right,...
Definition: zoom_func.h:22
Sprite
Data structure describing a sprite.
Definition: spritecache.h:17
Blitter::BlitterParams::remap
const byte * remap
XXX – Temporary storage for remap array.
Definition: base.hpp:34
BM_TRANSPARENT_REMAP
@ BM_TRANSPARENT_REMAP
Perform transparency colour remapping.
Definition: base.hpp:21