[directfb] Prepare to select the alpha/opaque pixel formats

Right now we assume to use 32bpp but depending on the hardware
this might not be optimal at all. Begin to prepare the code for
not having a 32bpp surfaces.

Change-Id: Iedfa49c568559e074dfaeae2a216c9eb93721d2c
Reviewed-by: Jørgen Lind <jorgen.lind@nokia.com>

2 files changed, 21 insertions, 2 deletions

diff --git a/src/plugins/platforms/directfb/qdirectfbblitter.cpp b/src/plugins/platforms/directfb/qdirectfbblitter.cpp
index fcca7dd840..bd31982d42 100644
--- a/src/plugins/platforms/directfb/qdirectfbblitter.cpp
+++ b/src/plugins/platforms/directfb/qdirectfbblitter.cpp
@@ -74,11 +74,11 @@ QDirectFbBlitter::QDirectFbBlitter(const QSize &rect, bool alpha)
 
     if (alpha) {
         surfaceDesc.caps = DSCAPS_PREMULTIPLIED;
-        surfaceDesc.pixelformat = DSPF_ARGB;
+        surfaceDesc.pixelformat = QDirectFbBlitter::alphaPixmapFormat();
         surfaceDesc.flags = DFBSurfaceDescriptionFlags(DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_CAPS | DSDESC_PIXELFORMAT);
     } else {
         surfaceDesc.flags = DFBSurfaceDescriptionFlags(DSDESC_WIDTH | DSDESC_HEIGHT | DSDESC_PIXELFORMAT);
-        surfaceDesc.pixelformat = DSPF_RGB32;
+        surfaceDesc.pixelformat = QDirectFbBlitter::pixmapFormat();
     }
 
 
@@ -92,6 +92,21 @@ QDirectFbBlitter::~QDirectFbBlitter()
     unlock();
 }
 
+DFBSurfacePixelFormat QDirectFbBlitter::alphaPixmapFormat()
+{
+    return DSPF_ARGB;
+}
+
+DFBSurfacePixelFormat QDirectFbBlitter::pixmapFormat()
+{
+    return DSPF_RGB32;
+}
+
+DFBSurfacePixelFormat QDirectFbBlitter::selectPixmapFormat(bool withAlpha)
+{
+    return withAlpha ? alphaPixmapFormat() : pixmapFormat();
+}
+
 void QDirectFbBlitter::fillRect(const QRectF &rect, const QColor &color)
 {
     m_surface->SetColor(m_surface.data(), color.red(), color.green(), color.blue(), color.alpha());
diff --git a/src/plugins/platforms/directfb/qdirectfbblitter.h b/src/plugins/platforms/directfb/qdirectfbblitter.h
index b1cc5be979..6ed3850487 100644
--- a/src/plugins/platforms/directfb/qdirectfbblitter.h
+++ b/src/plugins/platforms/directfb/qdirectfbblitter.h
@@ -58,6 +58,10 @@ public:
     virtual void fillRect(const QRectF &rect, const QColor &color);
     virtual void drawPixmap(const QRectF &rect, const QPixmap &pixmap, const QRectF &subrect);
 
+    static DFBSurfacePixelFormat alphaPixmapFormat();
+    static DFBSurfacePixelFormat pixmapFormat();
+    static DFBSurfacePixelFormat selectPixmapFormat(bool withAlpha);
+
 protected:
     virtual QImage *doLock();
     virtual void doUnlock();