Support semi-transparent surfaces in the OpenVG graphics system

Task-number: QT-2026
Reviewed-by: Jason Barron

1 files changed, 28 insertions, 0 deletions

diff --git a/src/openvg/qpaintengine_vg.cpp b/src/openvg/qpaintengine_vg.cpp
index 75b7fa5..fda4b10 100644
--- a/src/openvg/qpaintengine_vg.cpp
+++ b/src/openvg/qpaintengine_vg.cpp
@@ -3407,6 +3407,34 @@ void QVGPaintEngine::restoreState(QPaintEngine::DirtyFlags dirty)
 #endif
 }
 
+void QVGPaintEngine::fillRegion
+    (const QRegion& region, const QColor& color, const QSize& surfaceSize)
+{
+    Q_D(QVGPaintEngine);
+    if (d->clearColor != color || d->clearOpacity != 1.0f) {
+        VGfloat values[4];
+        values[0] = color.redF();
+        values[1] = color.greenF();
+        values[2] = color.blueF();
+        values[3] = color.alphaF();
+        vgSetfv(VG_CLEAR_COLOR, 4, values);
+        d->clearColor = color;
+        d->clearOpacity = 1.0f;
+    }
+    if (region.rectCount() == 1) {
+        QRect r = region.boundingRect();
+        vgClear(r.x(), surfaceSize.height() - r.y() - r.height(),
+                r.width(), r.height());
+    } else {
+        const QVector<QRect> rects = region.rects();
+        for (int i = 0; i < rects.size(); ++i) {
+            QRect r = rects.at(i);
+            vgClear(r.x(), surfaceSize.height() - r.y() - r.height(),
+                    r.width(), r.height());
+        }
+    }
+}
+
 #if !defined(QVG_NO_SINGLE_CONTEXT) && !defined(QT_NO_EGL)
 
 QVGCompositionHelper::QVGCompositionHelper()