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Fixed build with libpng older than 1.5.x

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This commit is contained in:
Alexander Smorkalov 2025-07-29 12:47:52 +03:00
parent 07cf36cbb0
commit eebb15683f
4 changed files with 20 additions and 4 deletions
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14
modules/imgcodecs/src/grfmt_png.cpp
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@ -648,7 +648,11 @@ bool PngDecoder::readData( Mat& img )
png_charp icc_name;
int compression_type;
#if (PNG_LIBPNG_VER_MAJOR*10000 + PNG_LIBPNG_VER_MINOR*100 + PNG_LIBPNG_VER_RELEASE >= 10500)
png_bytep icc_profile;
#else
png_charp icc_profile;
#endif
png_uint_32 icc_length;
if (png_get_iCCP(m_png_ptr, m_info_ptr, &icc_name, &compression_type, &icc_profile, &icc_length)) {
@ -1028,7 +1032,11 @@ bool PngEncoder::write( const Mat& img, const std::vector<int>& params )
if (!m_metadata.empty()) {
std::vector<uchar>& exif = m_metadata[IMAGE_METADATA_EXIF];
if (!exif.empty()) {
#ifdef PNG_eXIf_SUPPORTED
png_set_eXIf_1(png_ptr, info_ptr, static_cast<png_uint_32>(exif.size()), exif.data());
#else
CV_LOG_WARNING(NULL, "Libpng is too old and does not support EXIF.");
#endif
}
std::vector<uchar>& xmp = m_metadata[IMAGE_METADATA_XMP];
@ -1045,7 +1053,7 @@ bool PngEncoder::write( const Mat& img, const std::vector<int>& params )
std::vector<uchar> iccp = m_metadata[IMAGE_METADATA_ICCP];
if (!iccp.empty()) {
// PNG standard requires a profile name (null-terminated, max 79 characters, printable Latin-1)
const char* iccp_profile_name = "ICC Profile";
char iccp_profile_name[] = "ICC Profile";
// Compression type must be 0 (deflate) as per libpng docs
int compression_type = PNG_COMPRESSION_TYPE_BASE;
@ -1056,7 +1064,11 @@ bool PngEncoder::write( const Mat& img, const std::vector<int>& params )
png_set_iCCP(png_ptr, info_ptr,
iccp_profile_name,
compression_type,
#if (PNG_LIBPNG_VER_MAJOR*10000 + PNG_LIBPNG_VER_MINOR*100 + PNG_LIBPNG_VER_RELEASE >= 10500)
reinterpret_cast<png_const_bytep>(iccp.data()),
#else
reinterpret_cast<png_charp>(iccp.data()),
#endif
static_cast<png_uint_32>(iccp.size()));
}
}

2
modules/imgcodecs/test/test_exif.cpp
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@ -452,7 +452,7 @@ TEST(Imgcodecs_Png, Read_Write_With_Exif)
EXPECT_EQ(img2.rows, img.rows);
EXPECT_EQ(img2.type(), imgtype);
EXPECT_EQ(read_metadata_types, read_metadata_types2);
EXPECT_GE(read_metadata_types.size(), 1u);
ASSERT_GE(read_metadata_types.size(), 1u);
EXPECT_EQ(read_metadata, read_metadata2);
EXPECT_EQ(read_metadata_types[0], IMAGE_METADATA_EXIF);
EXPECT_EQ(read_metadata_types.size(), read_metadata.size());

0
modules/imgcodecs/test/test_gdal.cpp Executable file → Normal file
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8
modules/imgcodecs/test/test_png.cpp
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@ -19,7 +19,9 @@ TEST(Imgcodecs_Png, write_big)
EXPECT_EQ(13917, img.rows);
vector<uchar> buff;
ASSERT_NO_THROW(imencode(".png", img, buff, { IMWRITE_PNG_ZLIBBUFFER_SIZE, INT_MAX }));
bool status = false;
ASSERT_NO_THROW(status = imencode(".png", img, buff, { IMWRITE_PNG_ZLIBBUFFER_SIZE, 1024*1024 }));
ASSERT_TRUE(status);
#ifdef HAVE_PNG
EXPECT_EQ((size_t)816219, buff.size());
#else
@ -34,7 +36,9 @@ TEST(Imgcodecs_Png, encode)
vector<int> param;
param.push_back(IMWRITE_PNG_COMPRESSION);
param.push_back(3); //default(3) 0-9.
EXPECT_NO_THROW(imencode(".png", img_gt, buff, param));
bool status = false;
EXPECT_NO_THROW(status = imencode(".png", img_gt, buff, param));
ASSERT_TRUE(status);
Mat img;
EXPECT_NO_THROW(img = imdecode(buff, IMREAD_ANYDEPTH)); // hang
EXPECT_FALSE(img.empty());