1/* 2 * Copyright (C) 2006, 2007, 2008 Apple 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 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 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 <CoreGraphics/CoreGraphics.h> 34#include <wtf/MainThread.h> 35 36#if PLATFORM(COCOA) 37#include "WebCoreSystemInterface.h" 38#endif 39 40#if PLATFORM(WIN) 41#include <WebKitSystemInterface/WebKitSystemInterface.h> 42#endif 43 44namespace WebCore { 45 46static void patternCallback(void* info, CGContextRef context) 47{ 48 CGImageRef platformImage = static_cast<CGImageRef>(info); 49 if (!platformImage) 50 return; 51 52 CGRect rect = GraphicsContext(context).roundToDevicePixels( 53 FloatRect(0, 0, CGImageGetWidth(platformImage), CGImageGetHeight(platformImage))); 54 CGContextDrawImage(context, rect, platformImage); 55} 56 57static void patternReleaseOnMainThreadCallback(void* info) 58{ 59 CGImageRelease(static_cast<CGImageRef>(info)); 60} 61 62static void patternReleaseCallback(void* info) 63{ 64 callOnMainThread(patternReleaseOnMainThreadCallback, info); 65} 66 67CGPatternRef Pattern::createPlatformPattern(const AffineTransform& userSpaceTransformation) const 68{ 69 FloatRect tileRect = tileImage()->rect(); 70 71 AffineTransform patternTransform = userSpaceTransformation * m_patternSpaceTransformation; 72 patternTransform.scaleNonUniform(1, -1); 73 patternTransform.translate(0, -tileRect.height()); 74 75 // If we're repeating in both directions, we can use image-backed patterns 76 // instead of custom patterns, and avoid tiling-edge pixel cracks. 77 if (m_repeatX && m_repeatY) 78 return wkCGPatternCreateWithImageAndTransform(tileImage()->getCGImageRef(), patternTransform, wkPatternTilingConstantSpacing); 79 80 // If FLT_MAX should also be used for xStep or yStep, nothing is rendered. Using fractions of FLT_MAX also 81 // result in nothing being rendered. 82 // INT_MAX is almost correct, but there seems to be some number wrapping occurring making the fill 83 // pattern is not filled correctly. 84 // To make error of floating point less than 0.5, we use the half of the number of mantissa of float (1 << 22). 85 CGFloat xStep = m_repeatX ? tileRect.width() : (1 << 22); 86 CGFloat yStep = m_repeatY ? tileRect.height() : (1 << 22); 87 88 // The pattern will release the CGImageRef when it's done rendering in patternReleaseCallback 89 CGImageRef platformImage = CGImageRetain(tileImage()->getCGImageRef()); 90 91 const CGPatternCallbacks patternCallbacks = { 0, patternCallback, patternReleaseCallback }; 92 return CGPatternCreate(platformImage, tileRect, patternTransform, xStep, yStep, kCGPatternTilingConstantSpacing, TRUE, &patternCallbacks); 93} 94 95} 96