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1 /*
2  * Copyright (C) 2008, 2009, 2010, 2012 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 "platform/graphics/GradientGeneratedImage.h"
28 
29 #include "platform/geometry/FloatRect.h"
30 #include "platform/graphics/GraphicsContextStateSaver.h"
31 
32 namespace blink {
33 
draw(GraphicsContext * destContext,const FloatRect & destRect,const FloatRect & srcRect,CompositeOperator compositeOp,WebBlendMode blendMode)34 void GradientGeneratedImage::draw(GraphicsContext* destContext, const FloatRect& destRect, const FloatRect& srcRect, CompositeOperator compositeOp, WebBlendMode blendMode)
35 {
36     GraphicsContextStateSaver stateSaver(*destContext);
37     destContext->setCompositeOperation(compositeOp, blendMode);
38     destContext->clip(destRect);
39     destContext->translate(destRect.x(), destRect.y());
40     if (destRect.size() != srcRect.size())
41         destContext->scale(destRect.width() / srcRect.width(), destRect.height() / srcRect.height());
42     destContext->translate(-srcRect.x(), -srcRect.y());
43     destContext->setFillGradient(m_gradient);
44     destContext->fillRect(FloatRect(FloatPoint(), m_size));
45 }
46 
drawPattern(GraphicsContext * destContext,const FloatRect & srcRect,const FloatSize & scale,const FloatPoint & phase,CompositeOperator compositeOp,const FloatRect & destRect,WebBlendMode blendMode,const IntSize & repeatSpacing)47 void GradientGeneratedImage::drawPattern(GraphicsContext* destContext, const FloatRect& srcRect, const FloatSize& scale,
48     const FloatPoint& phase, CompositeOperator compositeOp, const FloatRect& destRect, WebBlendMode blendMode, const IntSize& repeatSpacing)
49 {
50     float stepX = srcRect.width() + repeatSpacing.width();
51     float stepY = srcRect.height() + repeatSpacing.height();
52     int firstColumn = static_cast<int>(floorf((((destRect.x() - phase.x()) / scale.width()) - srcRect.x()) / srcRect.width()));
53     int firstRow = static_cast<int>(floorf((((destRect.y() - phase.y()) / scale.height())  - srcRect.y()) / srcRect.height()));
54     for (int i = firstColumn; ; ++i) {
55         float dstX = (srcRect.x() + i * stepX) * scale.width() + phase.x();
56         // assert that first column encroaches left edge of dstRect.
57         ASSERT(i > firstColumn || dstX <= destRect.x());
58         ASSERT(i == firstColumn || dstX > destRect.x());
59 
60         if (dstX >= destRect.maxX())
61             break;
62         float dstMaxX = dstX + srcRect.width() * scale.width();
63         if (dstX < destRect.x())
64             dstX = destRect.x();
65         if (dstMaxX > destRect.maxX())
66             dstMaxX = destRect.maxX();
67         if (dstX >= dstMaxX)
68             continue;
69 
70         FloatRect visibleSrcRect;
71         FloatRect tileDstRect;
72         tileDstRect.setX(dstX);
73         tileDstRect.setWidth(dstMaxX - dstX);
74         visibleSrcRect.setX((tileDstRect.x() - phase.x()) / scale.width() - i * stepX);
75         visibleSrcRect.setWidth(tileDstRect.width() / scale.width());
76 
77         for (int j = firstRow; ; j++) {
78             float dstY = (srcRect.y() + j * stepY) * scale.height() + phase.y();
79             // assert that first row encroaches top edge of dstRect.
80             ASSERT(j > firstRow || dstY <= destRect.y());
81             ASSERT(j == firstRow || dstY > destRect.y());
82 
83             if (dstY >= destRect.maxY())
84                 break;
85             float dstMaxY = dstY + srcRect.height() * scale.height();
86             if (dstY < destRect.y())
87                 dstY = destRect.y();
88             if (dstMaxY > destRect.maxY())
89                 dstMaxY = destRect.maxY();
90             if (dstY >= dstMaxY)
91                 continue;
92 
93             tileDstRect.setY(dstY);
94             tileDstRect.setHeight(dstMaxY - dstY);
95             visibleSrcRect.setY((tileDstRect.y() - phase.y()) / scale.height() - j * stepY);
96             visibleSrcRect.setHeight(tileDstRect.height() / scale.height());
97             draw(destContext, tileDstRect, visibleSrcRect, compositeOp, blendMode);
98         }
99     }
100 }
101 
102 } // namespace blink
103