Prevent a deep copy of QImage::bits() in the OpenVG pixmap implementation

Task-number: QTBUG-5869
Reviewed-by: Sarah Smith
(cherry picked from commit 73477789bdeeba851cf095cbdda5c36d9f5c31df)

1 files changed, 10 insertions, 2 deletions

diff --git a/src/openvg/qpixmapdata_vg.cpp b/src/openvg/qpixmapdata_vg.cpp
index 9ca9749..3518ce1 100644
--- a/src/openvg/qpixmapdata_vg.cpp
+++ b/src/openvg/qpixmapdata_vg.cpp
@@ -202,6 +202,14 @@ QPaintEngine* QVGPixmapData::paintEngine() const
     return source.paintEngine();
 }
 
+// This function works around QImage::bits() making a deep copy if the
+// QImage is not const.  We force it to be const and then get the bits.
+// XXX: Should add a QImage::constBits() in the future to replace this.
+static inline const uchar *qt_vg_imageBits(const QImage& image)
+{
+    return image.bits();
+}
+
 VGImage QVGPixmapData::toVGImage()
 {
     if (!isValid())
@@ -232,7 +240,7 @@ VGImage QVGPixmapData::toVGImage()
     if (!source.isNull() && recreate) {
         vgImageSubData
             (vgImage,
-             source.bits(), source.bytesPerLine(),
+             qt_vg_imageBits(source), source.bytesPerLine(),
              VG_sARGB_8888_PRE, 0, 0, w, h);
     }
 
@@ -272,7 +280,7 @@ VGImage QVGPixmapData::toVGImage(qreal opacity)
     if (!source.isNull() && recreate) {
         vgImageSubData
             (vgImage,
-             source.bits(), source.bytesPerLine(),
+             qt_vg_imageBits(source), source.bytesPerLine(),
              VG_sARGB_8888_PRE, 0, 0, w, h);
     }