1 /*
2 * Copyright (C) 2012 Google 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'' 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;
19 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
20 * ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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
OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter * painter)41 OpaqueRectTrackingContentLayerDelegate::OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter* painter)
42 : m_painter(painter)
43 , m_opaque(false)
44 {
45 }
46
~OpaqueRectTrackingContentLayerDelegate()47 OpaqueRectTrackingContentLayerDelegate::~OpaqueRectTrackingContentLayerDelegate()
48 {
49 }
50
paintContents(SkCanvas * canvas,const WebRect & clip,bool canPaintLCDText,WebFloatRect & opaque)51 void OpaqueRectTrackingContentLayerDelegate::paintContents(SkCanvas* canvas, const WebRect& clip, bool canPaintLCDText, WebFloatRect& opaque)
52 {
53 static const unsigned char* annotationsEnabled = 0;
54 if (UNLIKELY(!annotationsEnabled))
55 annotationsEnabled = EventTracer::getTraceCategoryEnabledFlag(TRACE_DISABLED_BY_DEFAULT("blink.graphics_context_annotations"));
56
57 GraphicsContext context(canvas);
58 context.setTrackOpaqueRegion(!m_opaque);
59 context.setCertainlyOpaque(m_opaque);
60 context.setShouldSmoothFonts(canPaintLCDText);
61
62 if (*annotationsEnabled)
63 context.setAnnotationMode(AnnotateAll);
64
65 // Record transform prior to painting, as all opaque tracking will be
66 // relative to this current value.
67 AffineTransform canvasToContentTransform = context.getCTM().inverse();
68
69 m_painter->paint(context, clip);
70
71 // Transform tracked opaque paints back to our layer's content space.
72 ASSERT(canvasToContentTransform.isInvertible());
73 ASSERT(canvasToContentTransform.preservesAxisAlignment());
74 opaque = canvasToContentTransform.mapRect(context.opaqueRegion().asRect());
75 }
76
77 }
78