1/* 2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved. 3 * Copyright (C) 2008 Eric Seidel <eric@webkit.org> 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that the following conditions 7 * are met: 8 * 1. Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * 2. Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in the 12 * documentation and/or other materials provided with the distribution. 13 * 14 * THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY 15 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 16 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 17 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR 18 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, 19 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, 20 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR 21 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY 22 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE 24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 25 */ 26 27#include "config.h" 28#include "Pattern.h" 29 30#include "AffineTransform.h" 31#include "GraphicsContext.h" 32 33#include <ApplicationServices/ApplicationServices.h> 34 35namespace WebCore { 36 37static void patternCallback(void* info, CGContextRef context) 38{ 39 CGImageRef platformImage = static_cast<Image*>(info)->getCGImageRef(); 40 if (!platformImage) 41 return; 42 43 CGRect rect = GraphicsContext(context).roundToDevicePixels( 44 FloatRect(0, 0, CGImageGetWidth(platformImage), CGImageGetHeight(platformImage))); 45 CGContextDrawImage(context, rect, platformImage); 46} 47 48static void patternReleaseCallback(void* info) 49{ 50 static_cast<Image*>(info)->deref(); 51} 52 53CGPatternRef Pattern::createPlatformPattern(const AffineTransform& userSpaceTransformation) const 54{ 55 IntRect tileRect = tileImage()->rect(); 56 57 AffineTransform patternTransform = userSpaceTransformation * m_patternSpaceTransformation; 58 patternTransform.scaleNonUniform(1, -1); 59 patternTransform.translate(0, -tileRect.height()); 60 61 // If FLT_MAX should also be used for xStep or yStep, nothing is rendered. Using fractions of FLT_MAX also 62 // result in nothing being rendered. 63 // INT_MAX is almost correct, but there seems to be some number wrapping occurring making the fill 64 // pattern is not filled correctly. 65 // To make error of floating point less than 0.5, we use the half of the number of mantissa of float (1 << 22). 66 CGFloat xStep = m_repeatX ? tileRect.width() : (1 << 22); 67 CGFloat yStep = m_repeatY ? tileRect.height() : (1 << 22); 68 69 // The pattern will release the tile when it's done rendering in patternReleaseCallback 70 tileImage()->ref(); 71 72 const CGPatternCallbacks patternCallbacks = { 0, patternCallback, patternReleaseCallback }; 73 return CGPatternCreate(tileImage(), tileRect, patternTransform, xStep, yStep, 74 kCGPatternTilingConstantSpacing, TRUE, &patternCallbacks); 75} 76 77} 78