1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
|
/*
* Copyright (C) 2011 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE COMPUTER, INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE COMPUTER, INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "platform/graphics/CrossfadeGeneratedImage.h"
#include "platform/geometry/FloatRect.h"
#include "platform/graphics/GraphicsContext.h"
namespace blink {
CrossfadeGeneratedImage::CrossfadeGeneratedImage(Image* fromImage, Image* toImage, float percentage, IntSize crossfadeSize, const IntSize& size)
: GeneratedImage(size)
, m_fromImage(fromImage)
, m_toImage(toImage)
, m_percentage(percentage)
, m_crossfadeSize(crossfadeSize)
{
}
void CrossfadeGeneratedImage::drawCrossfade(SkCanvas* canvas, const SkPaint& paint, ImageClampingMode clampMode)
{
FloatRect fromImageRect(FloatPoint(), FloatSize(m_fromImage->size()));
FloatRect toImageRect(FloatPoint(), FloatSize(m_toImage->size()));
FloatRect destRect((FloatPoint()), FloatSize(m_crossfadeSize));
// TODO(junov): The various effects encoded into paint should probably be applied here
// instead of inside the layer. This probably faulty behavior was maintained in order
// to preserve pre-existing behavior while refactoring this code. This should be
// investigated further. crbug.com/472634
SkPaint layerPaint;
layerPaint.setXfermode(paint.getXfermode());
SkAutoCanvasRestore ar(canvas, false);
canvas->saveLayer(nullptr, &layerPaint);
SkPaint imagePaint(paint);
imagePaint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
int imageAlpha = clampedAlphaForBlending(1 - m_percentage);
imagePaint.setAlpha(imageAlpha > 255 ? 255 : imageAlpha);
imagePaint.setAntiAlias(paint.isAntiAlias());
// TODO(junov): This code should probably be propagating the RespectImageOrientationEnum
// form CrossfadeGeneratedImage::draw. Code was written this way during refactoring to
// avoid modifying existing behavior, but this warrants further investigation. crbug.com/472634
m_fromImage->draw(canvas, imagePaint, destRect, fromImageRect, DoNotRespectImageOrientation, clampMode);
imagePaint.setXfermodeMode(SkXfermode::kPlus_Mode);
imageAlpha = clampedAlphaForBlending(m_percentage);
imagePaint.setAlpha(imageAlpha > 255 ? 255 : imageAlpha);
m_toImage->draw(canvas, imagePaint, destRect, toImageRect, DoNotRespectImageOrientation, clampMode);
}
void CrossfadeGeneratedImage::draw(SkCanvas* canvas, const SkPaint& paint, const FloatRect& dstRect, const FloatRect& srcRect, RespectImageOrientationEnum, ImageClampingMode clampMode)
{
// Draw nothing if either of the images hasn't loaded yet.
if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
return;
SkAutoCanvasRestore ar(canvas, true);
canvas->clipRect(dstRect);
canvas->translate(dstRect.x(), dstRect.y());
if (dstRect.size() != srcRect.size())
canvas->scale(dstRect.width() / srcRect.width(), dstRect.height() / srcRect.height());
canvas->translate(-srcRect.x(), -srcRect.y());
drawCrossfade(canvas, paint, clampMode);
canvas->restore();
}
void CrossfadeGeneratedImage::drawTile(GraphicsContext& context, const FloatRect& srcRect)
{
// Draw nothing if either of the images hasn't loaded yet.
if (m_fromImage == Image::nullImage() || m_toImage == Image::nullImage())
return;
SkPaint paint = context.fillPaint();
paint.setXfermodeMode(SkXfermode::kSrcOver_Mode);
paint.setAntiAlias(context.shouldAntialias());
FloatRect destRect((FloatPoint()), FloatSize(m_crossfadeSize));
paint.setFilterQuality(context.computeFilterQuality(this, destRect, srcRect));
drawCrossfade(context.canvas(), paint, ClampImageToSourceRect);
}
} // namespace blink
|
