Lock for read only when possible

From benchmarking I've established that surface->Lock(DSLF_READ) is
faster than surface->Lock(DSLF_WRITE) which is faster than
surface->Lock(DSLF_READ|DSLF_WRITE).

This patch will make us Lock for read only, when possible.

Reviewed-by: Donald <qt-info@nokia.com>

1 files changed, 2 insertions, 2 deletions

diff --git a/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp b/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
index 14d2146..e9e2b1f 100644
--- a/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
+++ b/src/plugins/gfxdrivers/directfb/qdirectfbpaintengine.cpp
@@ -1040,7 +1040,7 @@ void QDirectFBPaintEngine::drawPixmap(const QRectF &r, const QPixmap &pixmap,
         QRasterPaintEngine::drawPixmap(r, pixmap, sr);
     } else if (!d->dfbCanHandleClip(r) || d->matrixRotShear) {
         RASTERFALLBACK(DRAW_PIXMAP, r, pixmap.size(), sr);
-        const QImage *img = static_cast<QDirectFBPixmapData*>(pixmap.pixmapData())->buffer();
+        const QImage *img = static_cast<QDirectFBPixmapData*>(pixmap.pixmapData())->buffer(DSLF_READ);
         d->lock();
         QRasterPaintEngine::drawImage(r, *img, sr);
     } else {
@@ -1066,7 +1066,7 @@ void QDirectFBPaintEngine::drawTiledPixmap(const QRectF &r,
         QRasterPaintEngine::drawTiledPixmap(r, pixmap, sp);
     } else if (!d->dfbCanHandleClip(r) || d->matrixRotShear || !sp.isNull()) {
         RASTERFALLBACK(DRAW_TILED_PIXMAP, r, pixmap.size(), sp);
-        const QImage *img = static_cast<QDirectFBPixmapData*>(pixmap.pixmapData())->buffer();
+        const QImage *img = static_cast<QDirectFBPixmapData*>(pixmap.pixmapData())->buffer(DSLF_READ);
         d->lock();
         QRasterPixmapData *data = new QRasterPixmapData(QPixmapData::PixmapType);
         data->fromImage(*img, Qt::AutoColor);