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graphics: support swapped byte order in bitmaps

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This commit is contained in:
K. Lange 2020-03-27 22:56:18 +09:00
parent 377f50ab7a
commit d6ed670213
1 changed files with 19 additions and 10 deletions
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29
lib/graphics.c
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@ -429,6 +429,13 @@ int load_sprite(sprite_t * sprite, char * filename) {
sprite->bitmap = malloc(sizeof(uint32_t) * width * height);
sprite->masks = NULL;
int bgr = ((unsigned char *)&bufferi[13])[2] == 0xFF;
#define _BMP_A 0x1000000
#define _BMP_R 0x1
#define _BMP_G 0x100
#define _BMP_B 0x10000
for (y = 0; y < height; ++y) {
for (x = 0; x < width; ++x) {
if (i > image_size) goto _cleanup_sprite;
@ -438,16 +445,18 @@ int load_sprite(sprite_t * sprite, char * filename) {
color = (bufferb[i + 3 * x] & 0xFF) +
(bufferb[i+1 + 3 * x] & 0xFF) * 0x100 +
(bufferb[i+2 + 3 * x] & 0xFF) * 0x10000 + 0xFF000000;
} else if (bpp == 32) {
if (bufferb[i + 4 * x] == 0) {
color = 0x000000;
} else {
color = (bufferb[i + 4 * x] & 0xFF) * 0x1000000 +
(bufferb[i+1 + 4 * x] & 0xFF) * 0x1 +
(bufferb[i+2 + 4 * x] & 0xFF) * 0x100 +
(bufferb[i+3 + 4 * x] & 0xFF) * 0x10000;
color = premultiply(color);
}
} else if (bpp == 32 && bgr == 0) {
color = (bufferb[i + 4 * x] & 0xFF) * _BMP_A +
(bufferb[i+1 + 4 * x] & 0xFF) * _BMP_R +
(bufferb[i+2 + 4 * x] & 0xFF) * _BMP_G +
(bufferb[i+3 + 4 * x] & 0xFF) * _BMP_B;
color = premultiply(color);
} else if (bpp == 32 && bgr == 1) {
color = (bufferb[i + 4 * x] & 0xFF) * _BMP_B +
(bufferb[i+1 + 4 * x] & 0xFF) * _BMP_G +
(bufferb[i+2 + 4 * x] & 0xFF) * _BMP_R +
(bufferb[i+3 + 4 * x] & 0xFF) * _BMP_A;
color = premultiply(color);
} else {
color = rgb(bufferb[i + x],bufferb[i + x],bufferb[i + x]); /* Unsupported */
}