Provide API for creating WKImage from CGImageRef

https://bugs.webkit.org/show_bug.cgi?id=56159

Reviewed by Sam Weinig.

Add function for creating a WKImage from CGImage data.
* Shared/API/c/cg/WKImageCG.cpp:
(WKImageCreateFromCGImage): Added. Creates a graphics context for the bitmap-backed image and draws into it. 
* Shared/API/c/cg/WKImageCG.h:



git-svn-id: svn://svn.chromium.org/blink/trunk@81087 bbb929c8-8fbe-4397-9dbb-9b2b20218538

third_party/WebKit/Source/WebKit2/ChangeLog

+2011-03-14  Alice Liu  <alice.liu@apple.com>
+
+        Reviewed by Sam Weinig.
+
+        Provide API for creating WKImage from CGImageRef
+        https://bugs.webkit.org/show_bug.cgi?id=56159
+
+        Add function for creating a WKImage from CGImage data.
+        * Shared/API/c/cg/WKImageCG.cpp:
+        (WKImageCreateFromCGImage): Added. Creates a graphics context for the bitmap-backed image and draws into it. 
+        * Shared/API/c/cg/WKImageCG.h:
+
 2011-03-14  Balazs Kelemen  <kbalazs@webkit.org>
 
         Reviewed by Adam Roben.

third_party/WebKit/Source/WebKit2/Shared/API/c/cg/WKImageCG.cpp

@@ -39,3 +39,12 @@ CGImageRef WKImageCreateCGImage(WKImageRef imageRef)
     OwnPtr<GraphicsContext> sourceContext = toImpl(imageRef)->bitmap()->createGraphicsContext();
     return CGBitmapContextCreateImage(sourceContext->platformContext());
 }
+
+WKImageRef WKImageCreateFromCGImage(CGImageRef imageRef, WKImageOptions options)
+{
+    IntSize imageSize(CGImageGetWidth(imageRef), CGImageGetHeight(imageRef));
+    RefPtr<WebImage> webImage = WebImage::create(imageSize, toImageOptions(options));
+    OwnPtr<GraphicsContext> graphicsContext = webImage->bitmap()->createGraphicsContext();
+    CGContextDrawImage(graphicsContext->platformContext(), CGRectMake(0, 0, imageSize.width(), imageSize.height()), imageRef);
+    return toAPI(webImage.release().leakRef());
+}

third_party/WebKit/Source/WebKit2/Shared/API/c/cg/WKImageCG.h

@@ -28,6 +28,7 @@
 
 #include <CoreGraphics/CGImage.h>
 #include <WebKit2/WKBase.h>
+#include <WebKit2/WKImage.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -35,6 +36,8 @@ extern "C" {
 
 WK_EXPORT CGImageRef WKImageCreateCGImage(WKImageRef image);
 
+WK_EXPORT WKImageRef WKImageCreateFromCGImage(CGImageRef imageRef, WKImageOptions options);
+
 #ifdef __cplusplus
 }
 #endif