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Merge pull request #8837 from radarhere/bcn_decode

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Do not convert BC1 LUT to UINT32
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Andrew Murray 2025-03-27 23:13:33 +11:00 committed by GitHub
commit fecb53b4b9
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1 changed files with 6 additions and 8 deletions
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14
src/libImaging/BcnDecode.c
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@ -25,7 +25,6 @@ typedef struct {
typedef struct {
UINT16 c0, c1;
UINT32 lut;
} bc1_color;
typedef struct {
@ -40,13 +39,10 @@ typedef struct {
#define LOAD16(p) (p)[0] | ((p)[1] << 8)
#define LOAD32(p) (p)[0] | ((p)[1] << 8) | ((p)[2] << 16) | ((p)[3] << 24)
static void
bc1_color_load(bc1_color *dst, const UINT8 *src) {
dst->c0 = LOAD16(src);
dst->c1 = LOAD16(src + 2);
dst->lut = LOAD32(src + 4);
}
static rgba
@ -70,7 +66,7 @@ static void
decode_bc1_color(rgba *dst, const UINT8 *src, int separate_alpha) {
bc1_color col;
rgba p[4];
int n, cw;
int n, o, cw;
UINT16 r0, g0, b0, r1, g1, b1;
bc1_color_load(&col, src);
@ -103,9 +99,11 @@ decode_bc1_color(rgba *dst, const UINT8 *src, int separate_alpha) {
p[3].b = 0;
p[3].a = 0;
}
for (n = 0; n < 16; n++) {
cw = 3 & (col.lut >> (2 * n));
dst[n] = p[cw];
for (n = 0; n < 4; n++) {
for (o = 0; o < 4; o++) {
cw = 3 & ((src + 4)[n] >> (2 * o));
dst[n * 4 + o] = p[cw];
}
}
}