2 * Copyright (C) 2006, 2007, 2008 Apple Computer, Inc. All rights reserved.
3 * Copyright (C) 2008 Eric Seidel <eric@webkit.org>
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
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.
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
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24 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 #include "AffineTransform.h"
31 #include "GraphicsContext.h"
32 #include <ApplicationServices/ApplicationServices.h>
33 #include <wtf/MainThread.h>
35 #if PLATFORM(MAC) || PLATFORM(CHROMIUM)
36 #include "WebCoreSystemInterface.h"
40 #include <WebKitSystemInterface/WebKitSystemInterface.h>
45 static void patternCallback(void* info, CGContextRef context)
47 CGImageRef platformImage = static_cast<Image*>(info)->getCGImageRef();
51 CGRect rect = GraphicsContext(context).roundToDevicePixels(
52 FloatRect(0, 0, CGImageGetWidth(platformImage), CGImageGetHeight(platformImage)));
53 CGContextDrawImage(context, rect, platformImage);
56 static void patternReleaseOnMainThreadCallback(void* info)
58 static_cast<Image*>(info)->deref();
61 static void patternReleaseCallback(void* info)
63 callOnMainThread(patternReleaseOnMainThreadCallback, info);
66 CGPatternRef Pattern::createPlatformPattern(const AffineTransform& userSpaceTransformation) const
68 IntRect tileRect = tileImage()->rect();
70 AffineTransform patternTransform = userSpaceTransformation * m_patternSpaceTransformation;
71 patternTransform.scaleNonUniform(1, -1);
72 patternTransform.translate(0, -tileRect.height());
74 // If we're repeating in both directions, we can use image-backed patterns
75 // instead of custom patterns, and avoid tiling-edge pixel cracks.
76 if (m_repeatX && m_repeatY)
77 return wkCGPatternCreateWithImageAndTransform(tileImage()->getCGImageRef(), patternTransform, wkPatternTilingConstantSpacing);
79 // If FLT_MAX should also be used for xStep or yStep, nothing is rendered. Using fractions of FLT_MAX also
80 // result in nothing being rendered.
81 // INT_MAX is almost correct, but there seems to be some number wrapping occurring making the fill
82 // pattern is not filled correctly.
83 // To make error of floating point less than 0.5, we use the half of the number of mantissa of float (1 << 22).
84 CGFloat xStep = m_repeatX ? tileRect.width() : (1 << 22);
85 CGFloat yStep = m_repeatY ? tileRect.height() : (1 << 22);
87 // The pattern will release the tile when it's done rendering in patternReleaseCallback
90 const CGPatternCallbacks patternCallbacks = { 0, patternCallback, patternReleaseCallback };
91 return CGPatternCreate(tileImage(), tileRect, patternTransform, xStep, yStep,
92 kCGPatternTilingConstantSpacing, TRUE, &patternCallbacks);