Added native image handle provider support in pixmaps on openvg.

QNativeImageHandleProvider is a thin interface consisting of get()
and release() functions. Pixmaps constructed with such a provider
will call these functions to acquire and release a native handle,
e.g. a CFbsBitmap or RSgImage pointer in case of Symbian. The behavior
is largely similar to constructing pixmaps via fromSymbianCFbsBitmap
or fromSymbianRSgImage, with the exception of pixmap hibernation:
release() (and subsequently get()) is guaranteed to be called also
in case of hibernation, allowing more fine-grained tracking of
the usage and lifetime of image data.

Task-number: QT-4632
Reviewed-by: Jani Hautakangas

1 files changed, 45 insertions, 0 deletions

diff --git a/src/openvg/qvg_symbian.cpp b/src/openvg/qvg_symbian.cpp
index c6521fd..5eb64bd 100644
--- a/src/openvg/qvg_symbian.cpp
+++ b/src/openvg/qvg_symbian.cpp
@@ -41,6 +41,7 @@
 
 #include "qpixmapdata_vg_p.h"
 #include "qvgfontglyphcache_p.h"
+#include <QtGui/private/qnativeimagehandleprovider_p.h>
 #include <private/qt_s60_p.h>
 
 #include <fbs.h>
@@ -111,6 +112,44 @@ void QVGPixmapData::cleanup()
     source = QVolatileImage();
 }
 
+bool QVGPixmapData::initFromNativeImageHandle(void *handle, const QString &type)
+{
+    if (type == QLatin1String("RSgImage")) {
+        fromNativeType(handle, QPixmapData::SgImage);
+        return true;
+    } else if (type == QLatin1String("CFbsBitmap")) {
+        fromNativeType(handle, QPixmapData::FbsBitmap);
+        return true;
+    }
+    return false;
+}
+
+void QVGPixmapData::createFromNativeImageHandleProvider()
+{
+    void *handle = 0;
+    QString type;
+    nativeImageHandleProvider->get(&handle, &type);
+    if (handle) {
+        if (initFromNativeImageHandle(handle, type)) {
+            nativeImageHandle = handle;
+            nativeImageType = type;
+        } else {
+            qWarning("QVGPixmapData: Unknown native image type '%s'", qPrintable(type));
+        }
+    } else {
+        qWarning("QVGPixmapData: Native handle is null");
+    }
+}
+
+void QVGPixmapData::releaseNativeImageHandle()
+{
+    if (nativeImageHandleProvider && nativeImageHandle) {
+        nativeImageHandleProvider->release(nativeImageHandle, nativeImageType);
+        nativeImageHandle = 0;
+        nativeImageType = QString();
+    }
+}
+
 void QVGPixmapData::fromNativeType(void* pixmap, NativeType type)
 {
     if (type == QPixmapData::SgImage && pixmap) {
@@ -149,6 +188,11 @@ void QVGPixmapData::fromNativeType(void* pixmap, NativeType type)
         source = *img;
         source.ensureFormat(idealFormat(&source.imageRef(), Qt::AutoColor));
         recreate = true;
+    } else if (type == QPixmapData::NativeImageHandleProvider && pixmap) {
+        destroyImages();
+        nativeImageHandleProvider = static_cast<QNativeImageHandleProvider *>(pixmap);
+        // Cannot defer the retrieval, we need at least the size right away.
+        createFromNativeImageHandleProvider();
     }
 }
 
@@ -216,6 +260,7 @@ void* QVGPixmapData::toNativeType(NativeType type)
         return reinterpret_cast<void*>(sgImage.take());
 #endif
     } else if (type == QPixmapData::FbsBitmap && isValid()) {
+        ensureReadback(true);
         if (source.isNull()) {
             source = QVolatileImage(w, h, sourceFormat());
         }