Add an image allocation pool to the OpenVG paint engine

Some OpenVG GPU's have limitations on the amount of memory
available to create VGImage's.  When the memory runs out,
vgCreateImage() will fail.

This change introduces QVGImagePool, which keeps track of all
QVGPixmapData image allocations and ejects least-recently-used
pixmaps when GPU memory is exhausted.

Task-number: QT-2554
Reviewed-by: trustme

1 files changed, 13 insertions, 12 deletions

diff --git a/src/openvg/qpixmapfilter_vg.cpp b/src/openvg/qpixmapfilter_vg.cpp
index e17c728..aa526ed 100644
--- a/src/openvg/qpixmapfilter_vg.cpp
+++ b/src/openvg/qpixmapfilter_vg.cpp
@@ -40,6 +40,7 @@
 ****************************************************************************/
 
 #include "qpixmapfilter_vg_p.h"
+#include "qvgimagepool_p.h"
 #include <QtCore/qvarlengtharray.h>
 #include <QtGui/qpainter.h>
 
@@ -82,9 +83,9 @@ void QVGPixmapConvolutionFilter::draw
         return;
 
     QSize size = pd->size();
-    VGImage dstImage = vgCreateImage
+    VGImage dstImage = QVGImagePool::instance()->createTemporaryImage
         (VG_sARGB_8888_PRE, size.width(), size.height(),
-         VG_IMAGE_QUALITY_FASTER);
+         VG_IMAGE_QUALITY_FASTER, pd);
     if (dstImage == VG_INVALID_HANDLE)
         return;
 
@@ -124,7 +125,7 @@ void QVGPixmapConvolutionFilter::draw
 
     if(child != dstImage)
         vgDestroyImage(child);
-    vgDestroyImage(dstImage);
+    QVGImagePool::instance()->releaseImage(0, dstImage);
 }
 
 QVGPixmapColorizeFilter::QVGPixmapColorizeFilter()
@@ -155,9 +156,9 @@ void QVGPixmapColorizeFilter::draw(QPainter *painter, const QPointF &dest, const
         return;
 
     QSize size = pd->size();
-    VGImage dstImage = vgCreateImage
+    VGImage dstImage = QVGImagePool::instance()->createTemporaryImage
         (VG_sARGB_8888_PRE, size.width(), size.height(),
-         VG_IMAGE_QUALITY_FASTER);
+         VG_IMAGE_QUALITY_FASTER, pd);
     if (dstImage == VG_INVALID_HANDLE)
         return;
 
@@ -217,7 +218,7 @@ void QVGPixmapColorizeFilter::draw(QPainter *painter, const QPointF &dest, const
 
     if(child != dstImage)
         vgDestroyImage(child);
-    vgDestroyImage(dstImage);
+    QVGImagePool::instance()->releaseImage(0, dstImage);
 }
 
 QVGPixmapDropShadowFilter::QVGPixmapDropShadowFilter()
@@ -248,9 +249,9 @@ void QVGPixmapDropShadowFilter::draw(QPainter *painter, const QPointF &dest, con
         return;
 
     QSize size = pd->size();
-    VGImage dstImage = vgCreateImage
+    VGImage dstImage = QVGImagePool::instance()->createTemporaryImage
         (VG_A_8, size.width(), size.height(),
-         VG_IMAGE_QUALITY_FASTER);
+         VG_IMAGE_QUALITY_FASTER, pd);
     if (dstImage == VG_INVALID_HANDLE)
         return;
 
@@ -282,7 +283,7 @@ void QVGPixmapDropShadowFilter::draw(QPainter *painter, const QPointF &dest, con
 
     if(child != dstImage)
         vgDestroyImage(child);
-    vgDestroyImage(dstImage);
+    QVGImagePool::instance()->releaseImage(0, dstImage);
 
     // Now draw the actual pixmap over the top.
     painter->drawPixmap(dest, src, srect);
@@ -316,9 +317,9 @@ void QVGPixmapBlurFilter::draw(QPainter *painter, const QPointF &dest, const QPi
         return;
 
     QSize size = pd->size();
-    VGImage dstImage = vgCreateImage
+    VGImage dstImage = QVGImagePool::instance()->createTemporaryImage
         (VG_sARGB_8888_PRE, size.width(), size.height(),
-         VG_IMAGE_QUALITY_FASTER);
+         VG_IMAGE_QUALITY_FASTER, pd);
     if (dstImage == VG_INVALID_HANDLE)
         return;
 
@@ -347,7 +348,7 @@ void QVGPixmapBlurFilter::draw(QPainter *painter, const QPointF &dest, const QPi
 
     if(child != dstImage)
         vgDestroyImage(child);
-    vgDestroyImage(dstImage);
+    QVGImagePool::instance()->releaseImage(0, dstImage);
 }
 
 #endif