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 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 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
