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Fix reading interlaced PNGs

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Either we let libpng handle the transform, or we don't.
But make up your mind!
This commit is contained in:
ISSOtm
2022-04-24 13:20:31 +02:00
committed by Eldred Habert
parent d569c6392c
commit 78e751f022
1 changed files with 4 additions and 3 deletions
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7
src/gfx/process.cpp
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@@ -294,8 +294,7 @@ public:
png_set_packing(png);
}
// Set interlace handling (MUST be done before `png_read_update_info`)
int nbPasses = png_set_interlace_handling(png);
// Do NOT call `png_set_interlace_handling`. We want to expand the rows ourselves.
// Update `info` with the transformations
png_read_update_info(png, info);
@@ -323,8 +322,10 @@ public:
}
}
} else {
assert(interlaceType == PNG_INTERLACE_ADAM7);
// For interlace to work properly, we must read the image `nbPasses` times
for (int pass = 0; pass < nbPasses; ++pass) {
for (int pass = 0; pass < PNG_INTERLACE_ADAM7_PASSES; ++pass) {
// The interlacing pass must be skipped if its width or height is reported as zero
if (PNG_PASS_COLS(width, pass) == 0 || PNG_PASS_ROWS(height, pass) == 0) {
continue;