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1 /*
2  * Copyright (C) 2011 Apple Inc. All rights reserved.
3  *
4  * Redistribution and use in source and binary forms, with or without
5  * modification, are permitted provided that the following conditions
6  * are met:
7  * 1. Redistributions of source code must retain the above copyright
8  *    notice, this list of conditions and the following disclaimer.
9  * 2. Redistributions in binary form must reproduce the above copyright
10  *    notice, this list of conditions and the following disclaimer in the
11  *    documentation and/or other materials provided with the distribution.
12  *
13  * THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS''
14  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
15  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS
17  * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
18  * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
19  * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
20  * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
21  * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
22  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
23  * THE POSSIBILITY OF SUCH DAMAGE.
24  */
25 
26 #include "config.h"
27 #include "CGUtilities.h"
28 
29 #include <wtf/RetainPtr.h>
30 
31 namespace WebKit {
32 
paintImage(CGContextRef context,CGImageRef image,CGPoint destination,CGRect source)33 void paintImage(CGContextRef context, CGImageRef image, CGPoint destination, CGRect source)
34 {
35     CGContextSaveGState(context);
36 
37     CGContextClipToRect(context, CGRectMake(destination.x, destination.y, source.size.width, source.size.height));
38     CGContextScaleCTM(context, 1, -1);
39 
40     size_t imageHeight = CGImageGetHeight(image);
41     size_t imageWidth = CGImageGetWidth(image);
42 
43     CGFloat destX = destination.x - source.origin.x;
44     CGFloat destY = -static_cast<CGFloat>(imageHeight) - destination.y + source.origin.y;
45 
46     CGContextDrawImage(context, CGRectMake(destX, destY, imageWidth, imageHeight), image);
47     CGContextRestoreGState(context);
48 }
49 
paintBitmapContext(CGContextRef context,CGContextRef bitmapContext,CGPoint destination,CGRect source)50 void paintBitmapContext(CGContextRef context, CGContextRef bitmapContext, CGPoint destination, CGRect source)
51 {
52     RetainPtr<CGImageRef> image(AdoptCF, CGBitmapContextCreateImage(bitmapContext));
53     paintImage(context, image.get(), destination, source);
54 }
55 
56 } // namespace WebKit
57 
58