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avcodec/sanm: fix codec33/34 tile generator

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Some of the calculated values were wrong and/or assigned
to the wrong pixel of the 4x4 block.
Found during testing with Rebel Assault Sega-CD release.

Signed-off-by: Manuel Lauss <manuel.lauss@gmail.com>
This commit is contained in:
Manuel Lauss
2025-05-30 12:34:23 +02:00
parent c064390736
commit b7662ddd15
1 changed files with 14 additions and 17 deletions
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31
libavcodec/sanm.c
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@ -493,14 +493,12 @@ static void codec33_gen_tiles(SANMVideoContext *ctx, int8_t param1)
for (k = 0; k < 8; k++) {
j = i + param1;
l = k + param1;
p = (j + k) / 2;
j = (j + p) / 2;
m = l / 2;
n = (i + param1);
o = (k + param1);
p = (j + l) >> 1;
n = (j + p) >> 1;
m = (p + l) >> 1;
*dst++ = p; *dst++ = p; *dst++ = j; *dst++ = n;
*dst++ = p; *dst++ = p; *dst++ = j; *dst++ = i;
*dst++ = p; *dst++ = p; *dst++ = n; *dst++ = j;
*dst++ = p; *dst++ = p; *dst++ = n; *dst++ = j;
*dst++ = m; *dst++ = m; *dst++ = p; *dst++ = j;
*dst++ = l; *dst++ = l; *dst++ = m; *dst++ = p;
}
@ -510,8 +508,8 @@ static void codec33_gen_tiles(SANMVideoContext *ctx, int8_t param1)
for (k = 0; k < 8; k++) {
j = i + param1;
l = k + param1;
n = ((j + l) / 2);
m = ((l + n) / 2);
n = (j + l) >> 1;
m = (l + n) >> 1;
*dst++ = j; *dst++ = j; *dst++ = j; *dst++ = j;
*dst++ = n; *dst++ = n; *dst++ = n; *dst++ = n;
@ -524,13 +522,12 @@ static void codec33_gen_tiles(SANMVideoContext *ctx, int8_t param1)
for (k = 0; k < 8; k++) {
j = i + param1;
l = k + param1;
m = (j + l) / 2;
n = (j + m) / 2;
o = m / 2;
p = j & 0xff;
m = (j + l) >> 1;
n = (j + m) >> 1;
o = (l + m) >> 1;
*dst++ = p; *dst++ = p; *dst++ = n; *dst++ = m;
*dst++ = p; *dst++ = p; *dst++ = n; *dst++ = m;
*dst++ = j; *dst++ = j; *dst++ = n; *dst++ = m;
*dst++ = j; *dst++ = j; *dst++ = n; *dst++ = m;
*dst++ = n; *dst++ = n; *dst++ = m; *dst++ = o;
*dst++ = m; *dst++ = m; *dst++ = o; *dst++ = l;
}
@ -540,8 +537,8 @@ static void codec33_gen_tiles(SANMVideoContext *ctx, int8_t param1)
for (k = 0; k < 8; k++) {
j = i + param1;
l = k + param1;
m = (j + l) / 2;
n = m / 2;
m = (j + l) >> 1;
n = (l + m) >> 1;
*dst++ = j; *dst++ = m; *dst++ = n; *dst++ = l;
*dst++ = j; *dst++ = m; *dst++ = n; *dst++ = l;