Upstream version 7.36.149.0
[platform/framework/web/crosswalk.git] / src / third_party / WebKit / Source / platform / graphics / OpaqueRectTrackingContentLayerDelegate.cpp
1 /*
2  * Copyright (C) 2012 Google Inc. All rights reserved.
3  *
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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'' AND ANY
14  * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
15  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
16  * DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY
17  * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
18  * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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21  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
22  * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
23  */
24
25 #include "config.h"
26
27 #include "platform/graphics/OpaqueRectTrackingContentLayerDelegate.h"
28
29 #include "platform/EventTracer.h"
30 #include "platform/geometry/IntRect.h"
31 #include "platform/graphics/GraphicsContext.h"
32 #include "platform/transforms/AffineTransform.h"
33 #include "public/platform/WebFloatRect.h"
34 #include "public/platform/WebRect.h"
35
36 using blink::WebFloatRect;
37 using blink::WebRect;
38
39 namespace WebCore {
40
41 OpaqueRectTrackingContentLayerDelegate::OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter* painter)
42     : m_painter(painter)
43     , m_opaque(false)
44 {
45 }
46
47 OpaqueRectTrackingContentLayerDelegate::~OpaqueRectTrackingContentLayerDelegate()
48 {
49 }
50
51 void OpaqueRectTrackingContentLayerDelegate::paintContents(
52     SkCanvas* canvas, const WebRect& clip, bool canPaintLCDText, WebFloatRect& opaque,
53     blink::WebContentLayerClient::GraphicsContextStatus contextStatus)
54 {
55     static const unsigned char* annotationsEnabled = 0;
56     if (UNLIKELY(!annotationsEnabled))
57         annotationsEnabled = EventTracer::getTraceCategoryEnabledFlag(TRACE_DISABLED_BY_DEFAULT("blink.graphics_context_annotations"));
58
59     GraphicsContext context(canvas,
60         contextStatus == blink::WebContentLayerClient::GraphicsContextEnabled ? GraphicsContext::NothingDisabled : GraphicsContext::FullyDisabled);
61     context.setTrackOpaqueRegion(!m_opaque);
62     context.setCertainlyOpaque(m_opaque);
63     context.setShouldSmoothFonts(canPaintLCDText);
64
65     if (*annotationsEnabled)
66         context.setAnnotationMode(AnnotateAll);
67
68     // Record transform prior to painting, as all opaque tracking will be
69     // relative to this current value.
70     AffineTransform canvasToContentTransform = context.getCTM().inverse();
71
72     m_painter->paint(context, clip);
73
74     // Transform tracked opaque paints back to our layer's content space.
75     ASSERT(canvasToContentTransform.isInvertible());
76     ASSERT(canvasToContentTransform.preservesAxisAlignment());
77     opaque = canvasToContentTransform.mapRect(context.opaqueRegion().asRect());
78 }
79
80 }