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[doc] md-plte-adjust.c: APNGs have an acTL chunk before PLTE.

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FIXME: The first palette entry in APNGs appears to be unused and has
low bits set...
This commit is contained in:
David Korth 2021-06-14 21:44:40 -04:00
parent 949b32565c
commit 0e9034b86f
1 changed files with 7 additions and 0 deletions
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7
doc/md-plte-adjust.c
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@ -154,6 +154,13 @@ int main(int argc, char *argv[])
// Read the PLTE header. (Must be the first chunk after IHDR.) // Read the PLTE header. (Must be the first chunk after IHDR.)
size = fread(&buf.plte, 1, sizeof(buf.plte), f_png); size = fread(&buf.plte, 1, sizeof(buf.plte), f_png);
if (size == sizeof(buf.plte) && !memcmp(buf.plte.magic, "acTL", 4)) {
// acTL. This is an APNG.
// PLTE should be immediately after it.
// FIXME: First color seems to be unused and has low bits set...
fseek(f_png, 8+4, SEEK_CUR);
size = fread(&buf.plte, 1, sizeof(buf.plte), f_png);
}
if (size != sizeof(buf.plte) || memcmp(buf.plte.magic, "PLTE", 4) != 0) { if (size != sizeof(buf.plte) || memcmp(buf.plte.magic, "PLTE", 4) != 0) {
fclose(f_png); fclose(f_png);
fprintf(stderr, "*** ERROR reading PNG file '%s': PLTE chunk is invalid or missing.\n", fprintf(stderr, "*** ERROR reading PNG file '%s': PLTE chunk is invalid or missing.\n",