Added support for six-parameter radial gradients.

The extended radial gradients conform to the radial gradient
specification in HTML 5 canvas.

Task-number: QTBUG-14075
Reviewed-by: Andreas Kling

1 files changed, 11 insertions, 3 deletions

diff --git a/src/gui/painting/qpainter.cpp b/src/gui/painting/qpainter.cpp
index 50d65e6..eddb9eb 100644
--- a/src/gui/painting/qpainter.cpp
+++ b/src/gui/painting/qpainter.cpp
@@ -502,8 +502,12 @@ void QPainterPrivate::draw_helper(const QPainterPath &originalPath, DrawOperatio
 
     q->save();
     state->matrix = QTransform();
-    state->dirtyFlags |= QPaintEngine::DirtyTransform;
-    updateState(state);
+    if (extended) {
+        extended->transformChanged();
+    } else {
+        state->dirtyFlags |= QPaintEngine::DirtyTransform;
+        updateState(state);
+    }
     engine->drawImage(absPathRect,
                  image,
                  QRectF(0, 0, absPathRect.width(), absPathRect.height()),
@@ -686,11 +690,14 @@ void QPainterPrivate::updateInvMatrix()
     invMatrix = state->matrix.inverted();
 }
 
+extern bool qt_isExtendedRadialGradient(const QBrush &brush);
+
 void QPainterPrivate::updateEmulationSpecifier(QPainterState *s)
 {
     bool alpha = false;
     bool linearGradient = false;
     bool radialGradient = false;
+    bool extendedRadialGradient = false;
     bool conicalGradient = false;
     bool patternBrush = false;
     bool xform = false;
@@ -722,6 +729,7 @@ void QPainterPrivate::updateEmulationSpecifier(QPainterState *s)
                            (brushStyle == Qt::LinearGradientPattern));
         radialGradient = ((penBrushStyle == Qt::RadialGradientPattern) ||
                            (brushStyle == Qt::RadialGradientPattern));
+        extendedRadialGradient = radialGradient && (qt_isExtendedRadialGradient(penBrush) || qt_isExtendedRadialGradient(s->brush));
         conicalGradient = ((penBrushStyle == Qt::ConicalGradientPattern) ||
                             (brushStyle == Qt::ConicalGradientPattern));
         patternBrush = (((penBrushStyle > Qt::SolidPattern
@@ -805,7 +813,7 @@ void QPainterPrivate::updateEmulationSpecifier(QPainterState *s)
         s->emulationSpecifier &= ~QPaintEngine::LinearGradientFill;
 
     // Radial gradient emulation
-    if (radialGradient && !engine->hasFeature(QPaintEngine::RadialGradientFill))
+    if (extendedRadialGradient || (radialGradient && !engine->hasFeature(QPaintEngine::RadialGradientFill)))
         s->emulationSpecifier |= QPaintEngine::RadialGradientFill;
     else
         s->emulationSpecifier &= ~QPaintEngine::RadialGradientFill;