Changeset 154985 in webkit

Timestamp:

Sep 3, 2013 8:32:07 AM (11 years ago)

Author:

allan.jensen@digia.com

Message:

[Qt] Images scaled poorly on composited canvas
​https://bugs.webkit.org/show_bug.cgi?id=120632

Reviewed by Jocelyn Turcotte.

Explicitly set a imageInterpolationQuality on the TextureMapper, because
InterpolationDefault may be interpreted differently by nested GraphicsContexts.

• WebCoreSupport/TextureMapperLayerClientQt.cpp:

(TextureMapperLayerClientQt::renderCompositedLayers):

Location:

trunk/Source/WebKit/qt

Files:

• ChangeLog (modified) (1 diff)
• WebCoreSupport/TextureMapperLayerClientQt.cpp (modified) (1 diff)

trunk/Source/WebKit/qt/ChangeLog

@@ +1 @@
+2013-09-03  Allan Sandfeld Jensen  <allan.jensen@digia.com>
+
+        [Qt] Images scaled poorly on composited canvas
+        https://bugs.webkit.org/show_bug.cgi?id=120632
+
+        Reviewed by Jocelyn Turcotte.
+
+        Explicitly set a imageInterpolationQuality on the TextureMapper, because
+        InterpolationDefault may be interpreted differently by nested GraphicsContexts.
+
+        * WebCoreSupport/TextureMapperLayerClientQt.cpp:
+        (TextureMapperLayerClientQt::renderCompositedLayers):
+
 2013-09-03  Allan Sandfeld Jensen  <allan.jensen@digia.com>
 

trunk/Source/WebKit/qt/WebCoreSupport/TextureMapperLayerClientQt.cpp

@@ -105 +105 @@
 
     m_textureMapper->setGraphicsContext(context);
-    m_textureMapper->setImageInterpolationQuality(context->imageInterpolationQuality());
+    // GraphicsContext::imageInterpolationQuality is always InterpolationDefault here,
+    // but 'default' may be interpreted differently due to a different backend QPainter,
+    // so we need to set an explicit imageInterpolationQuality.
+    if (context->platformContext()->renderHints() & QPainter::SmoothPixmapTransform)
+        m_textureMapper->setImageInterpolationQuality(WebCore::InterpolationMedium);
+    else
+        m_textureMapper->setImageInterpolationQuality(WebCore::InterpolationNone);
+
     m_textureMapper->setTextDrawingMode(context->textDrawingMode());
     QPainter* painter = context->platformContext();