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From a9e67318e6a8924c4b5461656bcc6a80720ae899 Mon Sep 17 00:00:00 2001
From: Allan Sandfeld Jensen <allan.jensen@qt.io>
Date: Tue, 6 Dec 2022 10:42:59 +0100
Subject: [PATCH] Fix wrong to linear conversion
Causing bad rendering of gamma corrected text on non-standard image
format paint devices.
Pick-to: 6.4 6.2 5.15
Fixes: QTBUG-109169
Change-Id: I6d95e9a42b9ccac609071123dd4535d25e225a29
Reviewed-by: Fabian Vogt <fabian@ritter-vogt.de>
Reviewed-by: Eirik Aavitsland <eirik.aavitsland@qt.io>
(cherry picked from commit a09c33e1f7b5999a16bce9dd23ef8ca33d519210)
---
src/gui/painting/qcolortrclut_p.h | 1 +
src/gui/painting/qdrawhelper.cpp | 2 +-
2 files changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/gui/painting/qcolortrclut_p.h b/src/gui/painting/qcolortrclut_p.h
index 76a6a60803..24fd522e6c 100644
--- a/src/gui/painting/qcolortrclut_p.h
+++ b/src/gui/painting/qcolortrclut_p.h
@@ -118,6 +118,7 @@ public:
return QRgba64::fromRgba64(r, g, b, qAlpha(rgb32) * 257);
#endif
}
+ QRgba64 toLinear64(QRgba64) const = delete;
QRgb toLinear(QRgb rgb32) const
{
diff --git a/src/gui/painting/qdrawhelper.cpp b/src/gui/painting/qdrawhelper.cpp
index a61793508a..5ba2d277b7 100644
--- a/src/gui/painting/qdrawhelper.cpp
+++ b/src/gui/painting/qdrawhelper.cpp
@@ -6091,7 +6091,7 @@ static inline void alphargbblend_argb32(quint32 *dst, uint coverage, const QRgba
static inline void rgbBlendPixel(QRgba64 &dst, int coverage, QRgba64 slinear, const QColorTrcLut *colorProfile)
{
// Do a gammacorrected RGB alphablend...
- const QRgba64 dlinear = colorProfile ? colorProfile->toLinear64(dst) : dst;
+ const QRgba64 dlinear = colorProfile ? colorProfile->toLinear(dst) : dst;
QRgba64 blend = rgbBlend(dlinear, slinear, coverage);
--
2.38.1
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