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use Z_BEST_SPEED as default quality for PNG images

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same as level 1 which is used in rcc, for reference:
https://www.zlib.net/manual.html

Signed-off-by: Ivailo Monev <xakepa10@gmail.com>
This commit is contained in:
Ivailo Monev 2021-06-24 14:55:35 +03:00
parent 7b6793612e
commit 42413708fd
1 changed files with 5 additions and 2 deletions
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7
src/gui/image/qpnghandler.cpp
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@ -29,11 +29,14 @@
#include "qvector.h" #include "qvector.h"
#include "qdrawhelper_p.h" #include "qdrawhelper_p.h"
#include <zlib.h>
#include <png.h> #include <png.h>
#include <pngconf.h> #include <pngconf.h>
QT_BEGIN_NAMESPACE QT_BEGIN_NAMESPACE
enum { QPNGDefaultQuality = Z_BEST_SPEED };
#if Q_BYTE_ORDER == Q_BIG_ENDIAN #if Q_BYTE_ORDER == Q_BIG_ENDIAN
# define QFILLER_ORDER PNG_FILLER_BEFORE # define QFILLER_ORDER PNG_FILLER_BEFORE
#else #else
@ -58,7 +61,7 @@ public:
}; };
QPngHandlerPrivate(QPngHandler *qq) QPngHandlerPrivate(QPngHandler *qq)
: gamma(0.0), quality(2), png_ptr(0), info_ptr(0), : gamma(0.0), quality(QPNGDefaultQuality), png_ptr(0), info_ptr(0),
end_info(0), row_pointers(0), state(Ready), q(qq) end_info(0), row_pointers(0), state(Ready), q(qq)
{ } { }
@ -679,7 +682,7 @@ bool QPngHandler::write(const QImage &image)
quality = qMin(quality, 100); quality = qMin(quality, 100);
quality = (100-quality) * 9 / 91; // map [0,100] -> [9,0] quality = (100-quality) * 9 / 91; // map [0,100] -> [9,0]
} else { } else {
quality = 2; quality = QPNGDefaultQuality;
} }
writer.setGamma(d->gamma); writer.setGamma(d->gamma);
return writer.writeImage(image, quality); return writer.writeImage(image, quality);