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@ r6895:394e17c42f1f
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Location: cpp/openttd-patchpack/source/src/blitter/32bpp_simple.cpp
r6895:394e17c42f1f
5.3 KiB
text/x-c
(svn r10142) -Fix r10132: do something useful with the alpha channel instead of ignoring it
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 | #include "../stdafx.h"
#include "../zoom.hpp"
#include "../gfx.h"
#include "../debug.h"
#include "../table/sprites.h"
#include "../renderer/32bpp.hpp"
#include "32bpp_simple.hpp"
static FBlitter_32bppSimple iFBlitter_32bppSimple;
/**
* Compose a color based on RGB values.
*/
static inline uint ComposeColor(uint r, uint g, uint b)
{
return (r & 0xFF) << 16 | (g & 0xFF) << 8 | (b & 0xFF) << 0;
}
/**
* Compose a color based on RGBA values and the current pixel value.
*/
static inline uint ComposeColorRGBA(uint r, uint g, uint b, uint a, uint current)
{
uint cr, cg, cb;
cr = GB(current, 16, 8);
cg = GB(current, 8, 8);
cb = GB(current, 0, 8);
return ComposeColor((r * a + cr * (255 - a)) / 255,
(g * a + cg * (255 - a)) / 255,
(b * a + cb * (255 - a)) / 255);
}
/**
* Compose a color based on Pixel value, alpha value, and the current pixel value.
*/
static inline uint ComposeColorPA(uint color, uint a, uint current)
{
uint r, g, b, cr, cg, cb;
r = GB(color, 16, 8);
g = GB(color, 8, 8);
b = GB(color, 0, 8);
cr = GB(current, 16, 8);
cg = GB(current, 8, 8);
cb = GB(current, 0, 8);
return ComposeColor((r * a + cr * (255 - a)) / 255,
(g * a + cg * (255 - a)) / 255,
(b * a + cb * (255 - a)) / 255);
}
/**
* Make a pixel looks like it is transparent.
* @param color the color already on the screen.
* @param amount the amount of transparency, times 100.
* @return the new color for the screen.
*/
static inline uint MakeTransparent(uint color, uint amount)
{
uint r, g, b;
r = GB(color, 16, 8);
g = GB(color, 8, 8);
b = GB(color, 0, 8);
return ComposeColor(r * amount / 100, g * amount / 100, b * amount / 100);
}
/**
* Make a color grey-based.
* @param color the color to make grey.
* @return the new color, now grey.
*/
static inline uint MakeGrey(uint color)
{
uint r, g, b;
r = GB(color, 16, 8);
g = GB(color, 8, 8);
b = GB(color, 0, 8);
/* To avoid doubles and stuff, multiple it with a total of 65536 (16bits), then
* divide by it to normalize the value to a byte again. See heightmap.cpp for
* information about the formula. */
color = ((r * 19595) + (g * 38470) + (b * 7471)) / 65536;
return ComposeColor(color, color, color);
}
void Blitter_32bppSimple::Draw(Blitter::BlitterParams *bp, BlitterMode mode, ZoomLevel zoom)
{
const SpriteLoader::CommonPixel *src, *src_line;
uint32 *dst, *dst_line;
/* Find where to start reading in the source sprite */
src_line = (const SpriteLoader::CommonPixel *)bp->sprite + (bp->skip_top * bp->sprite_width + bp->skip_left) * ScaleByZoom(1, zoom);
dst_line = (uint32 *)bp->dst + bp->top * bp->pitch + bp->left;
for (int y = 0; y < bp->height; y++) {
dst = dst_line;
dst_line += bp->pitch;
src = src_line;
src_line += bp->sprite_width * ScaleByZoom(1, zoom);
for (int x = 0; x < bp->width; x++) {
switch (mode) {
case BM_COLOUR_REMAP:
/* In case the m-channel is zero, do not remap this pixel in any way */
if (src->m == 0) {
if (src->a != 0) *dst = ComposeColorRGBA(src->r, src->g, src->b, src->a, *dst);
} else {
if (bp->remap[src->m] != 0) *dst = ComposeColorPA(Renderer_32bpp::LookupColourInPalette(bp->remap[src->m]), src->a, *dst);
}
break;
case BM_TRANSPARENT:
/* TODO -- We make an assumption here that the remap in fact is transparency, not some color.
* This is never a problem with the code we produce, but newgrfs can make it fail... or at least:
* we produce a result the newgrf maker didn't expect ;) */
/* Make the current color a bit more black, so it looks like this image is transparent */
if (src->a != 0) *dst = MakeTransparent(*dst, 75);
break;
default:
if (src->a != 0) *dst = ComposeColorRGBA(src->r, src->g, src->b, src->a, *dst);
break;
}
dst++;
src += ScaleByZoom(1, zoom);
}
}
}
void Blitter_32bppSimple::DrawColorMappingRect(void *dst, int width, int height, int pal)
{
uint32 *udst = (uint32 *)dst;
if (pal == PALETTE_TO_TRANSPARENT) {
do {
for (int i = 0; i != width; i++) {
*udst = MakeTransparent(*udst, 60);
udst++;
}
udst = udst - width + _screen.pitch;
} while (height--);
return;
}
if (pal == PALETTE_TO_STRUCT_GREY) {
do {
for (int i = 0; i != width; i++) {
*udst = MakeGrey(*udst);
udst++;
}
udst = udst - width + _screen.pitch;
} while (height--);
return;
}
DEBUG(misc, 0, "32bpp blitter doesn't know how to draw this color table ('%d')", pal);
}
Sprite *Blitter_32bppSimple::Encode(SpriteLoader::Sprite *sprite, Blitter::AllocatorProc *allocator)
{
Sprite *dest_sprite;
SpriteLoader::CommonPixel *dst;
dest_sprite = (Sprite *)allocator(sizeof(*dest_sprite) + sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));
dest_sprite->height = sprite->height;
dest_sprite->width = sprite->width;
dest_sprite->x_offs = sprite->x_offs;
dest_sprite->y_offs = sprite->y_offs;
dst = (SpriteLoader::CommonPixel *)dest_sprite->data;
memcpy(dst, sprite->data, sprite->height * sprite->width * sizeof(SpriteLoader::CommonPixel));
for (int i = 0; i < sprite->height * sprite->width; i++) {
if (dst[i].m != 0) {
/* Pre-convert the mapping channel to a RGB value */
uint color = Renderer_32bpp::LookupColourInPalette(dst[i].m);
dst[i].r = GB(color, 16, 8);
dst[i].g = GB(color, 8, 8);
dst[i].b = GB(color, 0, 8);
}
}
return dest_sprite;
}
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