diff options
author | Jiang Jiang <jiang.jiang@nokia.com> | 2011-07-28 08:55:21 (GMT) |
---|---|---|
committer | Jiang Jiang <jiang.jiang@nokia.com> | 2011-07-29 12:02:39 (GMT) |
commit | b3187d850aa6e0a4818e2a982d13aab77ca20a82 (patch) | |
tree | cc3b069edd75a1076d2e930f466b30143e1b6463 /src/opengl | |
parent | 3a66c5da851223cb4017d69ef3cca7d3818431c7 (diff) | |
download | Qt-b3187d850aa6e0a4818e2a982d13aab77ca20a82.zip Qt-b3187d850aa6e0a4818e2a982d13aab77ca20a82.tar.gz Qt-b3187d850aa6e0a4818e2a982d13aab77ca20a82.tar.bz2 |
Fix gamma corrected source color in GL
GL_EXT_framebuffer_sRGB expects linear RGB as input color, thus we
need to convert sRGB based input color into linear RGB first before
using glBlendColor with it.
Task-number: QTBUG-20574
Reviewed-by: Samuel Rødal
Diffstat (limited to 'src/opengl')
-rw-r--r-- | src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp | 48 |
1 files changed, 30 insertions, 18 deletions
diff --git a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp index a961366..dbbb07c 100644 --- a/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp +++ b/src/opengl/gl2paintengineex/qpaintengineex_opengl2.cpp @@ -1580,6 +1580,11 @@ static bool fontSmoothingApproximately(qreal target) } #endif +static inline qreal qt_sRGB_to_linear_RGB(qreal f) +{ + return f > 0.04045 ? qPow((f + 0.055) / 1.055, 2.4) : f / 12.92; +} + // #define QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO void QGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngineGlyphCache::Type glyphType, @@ -1739,12 +1744,34 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngineGlyphCache::Type glyp } QBrush pensBrush = q->state()->pen.brush(); - setBrush(pensBrush); - if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) { + bool srgbFrameBufferEnabled = false; + if (pensBrush.style() == Qt::SolidPattern && + (ctx->d_ptr->extension_flags & QGLExtensions::SRGBFrameBuffer)) { +#if defined(Q_WS_MAC) + if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) +#elif defined(Q_WS_WIN) + if (glyphType != QFontEngineGlyphCache::Raster_RGBMask || fontSmoothingApproximately(2.1)) +#else + if (false) +#endif + { + QColor c = pensBrush.color(); + qreal red = qt_sRGB_to_linear_RGB(c.redF()); + qreal green = qt_sRGB_to_linear_RGB(c.greenF()); + qreal blue = qt_sRGB_to_linear_RGB(c.blueF()); + c = QColor::fromRgbF(red, green, blue, c.alphaF()); + pensBrush.setColor(c); + + glEnable(FRAMEBUFFER_SRGB_EXT); + srgbFrameBufferEnabled = true; + } + } - // Subpixel antialiasing without gamma correction + setBrush(pensBrush); + if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) { + // Subpixel antialiasing with gamma correction QPainter::CompositionMode compMode = q->state()->composition_mode; Q_ASSERT(compMode == QPainter::CompositionMode_Source || compMode == QPainter::CompositionMode_SourceOver); @@ -1851,21 +1878,6 @@ void QGL2PaintEngineExPrivate::drawCachedGlyphs(QFontEngineGlyphCache::Type glyp } } - bool srgbFrameBufferEnabled = false; - if (ctx->d_ptr->extension_flags & QGLExtensions::SRGBFrameBuffer) { -#if defined(Q_WS_MAC) - if (glyphType == QFontEngineGlyphCache::Raster_RGBMask) -#elif defined(Q_WS_WIN) - if (glyphType != QFontEngineGlyphCache::Raster_RGBMask || fontSmoothingApproximately(2.1)) -#else - if (false) -#endif - { - glEnable(FRAMEBUFFER_SRGB_EXT); - srgbFrameBufferEnabled = true; - } - } - #if defined(QT_OPENGL_DRAWCACHEDGLYPHS_INDEX_ARRAY_VBO) glDrawElements(GL_TRIANGLE_STRIP, 6 * numGlyphs, GL_UNSIGNED_SHORT, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, 0); |