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Merge pull request #26915 from mshabunin:fix-png-be

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Resolves #26913
Related(?): #25715 #26832
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Maksim Shabunin 2025-02-13 16:58:15 +03:00 committed by GitHub
parent 8e65075c1e
commit 45aa502549
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1 changed files with 11 additions and 11 deletions
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22
modules/imgcodecs/src/grfmt_png.cpp
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@ -121,16 +121,16 @@
namespace cv
{
const uint32_t id_IHDR = 0x52444849; // PNG header
const uint32_t id_acTL = 0x4C546361; // Animation control chunk
const uint32_t id_fcTL = 0x4C546366; // Frame control chunk
const uint32_t id_IDAT = 0x54414449; // first frame and/or default image
const uint32_t id_fdAT = 0x54416466; // Frame data chunk
const uint32_t id_PLTE = 0x45544C50; // The PLTE chunk contains a color palette for indexed-color images
const uint32_t id_bKGD = 0x44474B62; // The bKGD chunk specifies a default background color for the image
const uint32_t id_tRNS = 0x534E5274; // The tRNS chunk provides transparency information
const uint32_t id_tEXt = 0x74584574; // The tEXt chunk stores metadata as text in key-value pairs
const uint32_t id_IEND = 0x444E4549; // end/footer chunk
const uint32_t id_IHDR = 0x49484452; // PNG header
const uint32_t id_acTL = 0x6163544C; // Animation control chunk
const uint32_t id_fcTL = 0x6663544C; // Frame control chunk
const uint32_t id_IDAT = 0x49444154; // first frame and/or default image
const uint32_t id_fdAT = 0x66644154; // Frame data chunk
const uint32_t id_PLTE = 0x504C5445; // The PLTE chunk contains a color palette for indexed-color images
const uint32_t id_bKGD = 0x624B4744; // The bKGD chunk specifies a default background color for the image
const uint32_t id_tRNS = 0x74524E53; // The tRNS chunk provides transparency information
const uint32_t id_tEXt = 0x74455874; // The tEXt chunk stores metadata as text in key-value pairs
const uint32_t id_IEND = 0x49454E44; // end/footer chunk
APNGFrame::APNGFrame()
{
@ -699,7 +699,7 @@ uint32_t PngDecoder::read_chunk(Chunk& chunk)
return 0;
const size_t size = static_cast<size_t>(png_get_uint_32(size_id)) + 12;
const uint32_t id = *(uint32_t*)(&size_id[4]);
const uint32_t id = png_get_uint_32(size_id + 4);
if (id == id_IHDR) {
// 8=HDR+size, 13=size of IHDR chunk, 4=CRC
// http://www.libpng.org/pub/png/spec/1.2/PNG-Chunks.html#C.IHDR