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27 #include "platform/graphics/OpaqueRectTrackingContentLayerDelegate.h"
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"
36 using blink::WebFloatRect;
41 OpaqueRectTrackingContentLayerDelegate::OpaqueRectTrackingContentLayerDelegate(GraphicsContextPainter* painter)
47 OpaqueRectTrackingContentLayerDelegate::~OpaqueRectTrackingContentLayerDelegate()
51 void OpaqueRectTrackingContentLayerDelegate::paintContents(
52 SkCanvas* canvas, const WebRect& clip, bool canPaintLCDText, WebFloatRect& opaque,
53 blink::WebContentLayerClient::GraphicsContextStatus contextStatus)
55 static const unsigned char* annotationsEnabled = 0;
56 if (UNLIKELY(!annotationsEnabled))
57 annotationsEnabled = EventTracer::getTraceCategoryEnabledFlag(TRACE_DISABLED_BY_DEFAULT("blink.graphics_context_annotations"));
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);
65 if (*annotationsEnabled)
66 context.setAnnotationMode(AnnotateAll);
68 // Record transform prior to painting, as all opaque tracking will be
69 // relative to this current value.
70 AffineTransform canvasToContentTransform = context.getCTM().inverse();
72 m_painter->paint(context, clip);
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());