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QPNGImageWriter: fix compilation with libpng 1.4

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Amends 83de6d0ce5.

The interface of png_set_iCCP() changed source-incompatibly from 1.4
to 1.5. #ifdef on the version as is done elsewhere in the code. Drop a
no-op C cast.

Also add PNG_iCCP_SUPPORTED around the new code, as that check is used
elsewhere in the code.

Change-Id: Ie203bd9eebea5697f426fa3e95591f86346b2685
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
This commit is contained in:
Marc Mutz 2019-07-25 14:00:04 +03:00
parent 889b1c4b28
commit 1fcd8345ac
1 changed files with 12 additions and 3 deletions
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15
src/gui/image/qpnghandler.cpp
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@ -980,6 +980,7 @@ bool QPNGImageWriter::writeImage(const QImage& image, volatile int compression_i
bpc, // per channel
color_type, 0, 0, 0); // sets #channels
#ifdef PNG_iCCP_SUPPORTED
if (image.colorSpace().isValid()) {
QColorSpace cs = image.colorSpace();
// Support the old gamma making it override transferfunction.
@ -995,9 +996,17 @@ bool QPNGImageWriter::writeImage(const QImage& image, volatile int compression_i
if (iccProfileName.isEmpty())
iccProfileName = QByteArrayLiteral("Custom");
QByteArray iccProfile = cs.iccProfile();
png_set_iCCP(png_ptr, info_ptr, (png_const_charp)iccProfileName.constData(),
PNG_COMPRESSION_TYPE_BASE, (png_const_bytep)iccProfile.constData(), iccProfile.length());
} else if (gamma != 0.0) {
png_set_iCCP(png_ptr, info_ptr,
#if PNG_LIBPNG_VER < 10500
iccProfileName.data(), PNG_COMPRESSION_TYPE_BASE, iccProfile.data(),
#else
iccProfileName.constData(), PNG_COMPRESSION_TYPE_BASE,
(png_const_bytep)iccProfile.constData(),
#endif
iccProfile.length());
} else
#endif
if (gamma != 0.0) {
png_set_gAMA(png_ptr, info_ptr, 1.0/gamma);
}