1/*
2 * Copyright (C) 2008-2016 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 "GradientImage.h"
28
29#include "GraphicsContext.h"
30#include "ImageBuffer.h"
31
32namespace WebCore {
33
34GradientImage::GradientImage(Gradient& generator, const FloatSize& size)
35 : m_gradient(generator)
36{
37 setContainerSize(size);
38}
39
40GradientImage::~GradientImage() = default;
41
42ImageDrawResult GradientImage::draw(GraphicsContext& destContext, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator compositeOp, BlendMode blendMode, DecodingMode, ImageOrientationDescription)
43{
44 GraphicsContextStateSaver stateSaver(destContext);
45 destContext.setCompositeOperation(compositeOp, blendMode);
46 destContext.clip(destRect);
47 destContext.translate(destRect.location());
48 if (destRect.size() != srcRect.size())
49 destContext.scale(destRect.size() / srcRect.size());
50 destContext.translate(-srcRect.location());
51 destContext.fillRect(FloatRect(FloatPoint(), size()), m_gradient.get());
52 return ImageDrawResult::DidDraw;
53}
54
55void GradientImage::drawPattern(GraphicsContext& destContext, const FloatRect& destRect, const FloatRect& srcRect, const AffineTransform& patternTransform,
56 const FloatPoint& phase, const FloatSize& spacing, CompositeOperator compositeOp, BlendMode blendMode)
57{
58 // Allow the generator to provide visually-equivalent tiling parameters for better performance.
59 FloatSize adjustedSize = size();
60 FloatRect adjustedSrcRect = srcRect;
61 m_gradient->adjustParametersForTiledDrawing(adjustedSize, adjustedSrcRect, spacing);
62
63 // Factor in the destination context's scale to generate at the best resolution
64 AffineTransform destContextCTM = destContext.getCTM(GraphicsContext::DefinitelyIncludeDeviceScale);
65 double xScale = fabs(destContextCTM.xScale());
66 double yScale = fabs(destContextCTM.yScale());
67 AffineTransform adjustedPatternCTM = patternTransform;
68 adjustedPatternCTM.scale(1.0 / xScale, 1.0 / yScale);
69 adjustedSrcRect.scale(xScale, yScale);
70
71 unsigned generatorHash = m_gradient->hash();
72
73 if (!m_cachedImage || m_cachedGeneratorHash != generatorHash || m_cachedAdjustedSize != adjustedSize || !areEssentiallyEqual(destContext.scaleFactor(), m_cachedScaleFactor)) {
74 auto imageBuffer = ImageBuffer::createCompatibleBuffer(adjustedSize, ColorSpaceSRGB, destContext);
75 if (!imageBuffer)
76 return;
77
78 // Fill with the generated image.
79 imageBuffer->context().fillRect(FloatRect(FloatPoint(), adjustedSize), m_gradient.get());
80
81 m_cachedGeneratorHash = generatorHash;
82 m_cachedAdjustedSize = adjustedSize;
83 m_cachedScaleFactor = destContext.scaleFactor();
84
85 if (destContext.drawLuminanceMask())
86 imageBuffer->convertToLuminanceMask();
87
88 m_cachedImage = ImageBuffer::sinkIntoImage(WTFMove(imageBuffer), PreserveResolution::Yes);
89 }
90
91 destContext.setDrawLuminanceMask(false);
92
93 // Tile the image buffer into the context.
94 m_cachedImage->drawPattern(destContext, destRect, adjustedSrcRect, adjustedPatternCTM, phase, spacing, compositeOp, blendMode);
95
96}
97
98void GradientImage::dump(WTF::TextStream& ts) const
99{
100 GeneratedImage::dump(ts);
101 // FIXME: dump the gradient.
102}
103
104}
105