1 files changed, 64 insertions, 0 deletions
diff --git a/Source/WebKit2/Platform/cg/CGUtilities.cpp b/Source/WebKit2/Platform/cg/CGUtilities.cpp
new file mode 100644
index 0000000..1e5dd33
--- /dev/null
+++ b/Source/WebKit2/Platform/cg/CGUtilities.cpp
@@ -0,0 +1,64 @@
+/*
+ * Copyright (C) 2011 Apple Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
+ * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
+ * THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "CGUtilities.h"
+
+#include <wtf/RetainPtr.h>
+
+namespace WebKit {
+    
+void paintBitmapContext(CGContextRef context, CGContextRef bitmapContext, CGPoint destination, CGRect source)
+{
+    void* bitmapData = CGBitmapContextGetData(bitmapContext);
+    ASSERT(bitmapData);
+
+    size_t imageWidth = CGBitmapContextGetWidth(bitmapContext);
+    size_t imageHeight = CGBitmapContextGetHeight(bitmapContext);
+
+    size_t bytesPerRow = CGBitmapContextGetBytesPerRow(bitmapContext);
+
+    RetainPtr<CGDataProviderRef> dataProvider(AdoptCF, CGDataProviderCreateWithData(0, bitmapData, bytesPerRow * imageHeight, 0));
+    RetainPtr<CGImageRef> image(AdoptCF, CGImageCreate(imageWidth, imageHeight, 
+                                                       CGBitmapContextGetBitsPerComponent(bitmapContext),
+                                                       CGBitmapContextGetBitsPerPixel(bitmapContext), 
+                                                       bytesPerRow,
+                                                       CGBitmapContextGetColorSpace(bitmapContext), 
+                                                       CGBitmapContextGetBitmapInfo(bitmapContext), 
+                                                       dataProvider.get(), 0, false, kCGRenderingIntentDefault));
+
+    CGContextSaveGState(context);
+
+    CGContextClipToRect(context, CGRectMake(destination.x, destination.y, source.size.width, source.size.height));
+    CGContextScaleCTM(context, 1, -1);
+
+    CGFloat destX = destination.x - source.origin.x;
+    CGFloat destY = -static_cast<CGFloat>(imageHeight) - destination.y + source.origin.y;
+
+    CGContextDrawImage(context, CGRectMake(destX, destY, imageWidth, imageHeight), image.get());
+    CGContextRestoreGState(context);
+}
+    
+} // namespace WebKit
+