cc/raster/raster_source.cc - chromium/src - Git at Google

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.

 #include "cc/raster/raster_source.h"

 #include <stddef.h>

 #include "base/metrics/histogram_macros.h"
 #include "base/trace_event/trace_event.h"
 #include "cc/base/math_util.h"
 #include "cc/base/region.h"
 #include "cc/debug/debug_colors.h"
 #include "cc/paint/display_item_list.h"
 #include "cc/paint/image_provider.h"
 #include "cc/paint/skia_paint_canvas.h"
 #include "components/viz/common/traced_value.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "ui/gfx/geometry/axis_transform2d.h"
 #include "ui/gfx/geometry/rect_conversions.h"

 namespace cc {

 RasterSource::RasterSource(const RecordingSource* other)
     : display_list_(other->display_list_),
       painter_reported_memory_usage_(other->painter_reported_memory_usage_),
       background_color_(other->background_color_),
       requires_clear_(other->requires_clear_),
       is_solid_color_(other->is_solid_color_),
       solid_color_(other->solid_color_),
       recorded_viewport_(other->recorded_viewport_),
       size_(other->size_),
       slow_down_raster_scale_factor_for_debug_(
           other->slow_down_raster_scale_factor_for_debug_),
       recording_scale_factor_(other->recording_scale_factor_) {}

 RasterSource::~RasterSource() = default;

 void RasterSource::ClearForOpaqueRaster(
     SkCanvas* raster_canvas,
     const gfx::Size& content_size,
     const gfx::Rect& canvas_bitmap_rect,
     const gfx::Rect& canvas_playback_rect) const {
   // The last texel of this content is not guaranteed to be fully opaque, so
   // inset by one to generate the fully opaque coverage rect.  This rect is
   // in device space.
   SkIRect coverage_device_rect =
       SkIRect::MakeWH(content_size.width() - canvas_bitmap_rect.x() - 1,
                       content_size.height() - canvas_bitmap_rect.y() - 1);

   // If not fully covered, we need to clear one texel inside the coverage
   // rect (because of blending during raster) and one texel outside the canvas
   // bitmap rect (because of bilinear filtering during draw).  See comments
   // in RasterSource.
   SkIRect device_column = SkIRect::MakeXYWH(coverage_device_rect.right(), 0, 2,
                                             coverage_device_rect.bottom());
   // row includes the corner, column excludes it.
   SkIRect device_row = SkIRect::MakeXYWH(0, coverage_device_rect.bottom(),
                                          coverage_device_rect.right() + 2, 2);

   bool right_edge = content_size.width() == canvas_playback_rect.right();
   bool bottom_edge = content_size.height() == canvas_playback_rect.bottom();

   // If the playback rect is touching either edge of the content rect
   // extend it by one pixel to include the extra texel outside the canvas
   // bitmap rect that was added to device column and row above.
   SkIRect playback_device_rect =
       SkIRect::MakeXYWH(canvas_playback_rect.x() - canvas_bitmap_rect.x(),
                         canvas_playback_rect.y() - canvas_bitmap_rect.y(),
                         canvas_playback_rect.width() + (right_edge ? 1 : 0),
                         canvas_playback_rect.height() + (bottom_edge ? 1 : 0));

   // Intersect the device column and row with the playback rect and only
   // clear inside of that rect if needed.
   if (device_column.intersect(playback_device_rect)) {
     raster_canvas->save();
     raster_canvas->clipRect(SkRect::Make(device_column), SkClipOp::kIntersect,
                             false);
     raster_canvas->drawColor(background_color_, SkBlendMode::kSrc);
     raster_canvas->restore();
   }
   if (device_row.intersect(playback_device_rect)) {
     raster_canvas->save();
     raster_canvas->clipRect(SkRect::Make(device_row), SkClipOp::kIntersect,
                             false);
     raster_canvas->drawColor(background_color_, SkBlendMode::kSrc);
     raster_canvas->restore();
   }
 }

 void RasterSource::PlaybackToCanvas(
     SkCanvas* raster_canvas,
     const gfx::Size& content_size,
     const gfx::Rect& canvas_bitmap_rect,
     const gfx::Rect& canvas_playback_rect,
     const gfx::AxisTransform2d& raster_transform,
     const PlaybackSettings& settings) const {
   SkIRect raster_bounds = gfx::RectToSkIRect(canvas_bitmap_rect);
   if (!canvas_playback_rect.IsEmpty() &&
       !raster_bounds.intersect(gfx::RectToSkIRect(canvas_playback_rect)))
     return;
   // Treat all subnormal values as zero for performance.
   ScopedSubnormalFloatDisabler disabler;

   bool is_partial_raster = canvas_bitmap_rect != canvas_playback_rect;
   if (!requires_clear_) {
     // Clear opaque raster sources.  Opaque rasters sources guarantee that all
     // pixels inside the opaque region are painted.  However, due to scaling
     // it's possible that the last row and column might include pixels that
     // are not painted.  Because this raster source is required to be opaque,
     // we may need to do extra clearing outside of the clip.  This needs to
     // be done for both full and partial raster.
     ClearForOpaqueRaster(raster_canvas, content_size, canvas_bitmap_rect,
                          canvas_playback_rect);
   } else if (!is_partial_raster) {
     // For non-opaque raster sources that are rastering the full tile,
     // just clear the entire canvas (even if stretches past the canvas
     // bitmap rect) as it's cheap to do so.
     raster_canvas->clear(SK_ColorTRANSPARENT);
   }

   raster_canvas->save();
   raster_canvas->translate(-canvas_bitmap_rect.x(), -canvas_bitmap_rect.y());
   raster_canvas->clipRect(SkRect::Make(raster_bounds));
   raster_canvas->translate(raster_transform.translation().x(),
                            raster_transform.translation().y());
   raster_canvas->scale(raster_transform.scale() / recording_scale_factor_,
                        raster_transform.scale() / recording_scale_factor_);

   if (is_partial_raster && requires_clear_) {
     // Because Skia treats painted regions as transparent by default, we don't
     // need to clear outside of the playback rect in the same way that
     // ClearForOpaqueRaster must handle.
     raster_canvas->clear(SK_ColorTRANSPARENT);
   }

   PlaybackToCanvas(raster_canvas, settings.image_provider);
   raster_canvas->restore();
 }

 void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
                                     ImageProvider* image_provider) const {
   // TODO(enne): Temporary CHECK debugging for http://crbug.com/823835
   CHECK(display_list_.get());
   int repeat_count = std::max(1, slow_down_raster_scale_factor_for_debug_);
   for (int i = 0; i < repeat_count; ++i)
     display_list_->Raster(raster_canvas, image_provider);
 }

 size_t RasterSource::GetMemoryUsage() const {
   if (!display_list_)
     return 0;
   return display_list_->BytesUsed() + painter_reported_memory_usage_;
 }

 bool RasterSource::PerformSolidColorAnalysis(gfx::Rect layer_rect,
                                              SkColor* color) const {
   TRACE_EVENT0("cc", "RasterSource::PerformSolidColorAnalysis");

   layer_rect.Intersect(gfx::Rect(size_));
   layer_rect = gfx::ScaleToRoundedRect(layer_rect, recording_scale_factor_);
   return display_list_->GetColorIfSolidInRect(layer_rect, color);
 }

 void RasterSource::GetDiscardableImagesInRect(
     const gfx::Rect& layer_rect,
     std::vector<const DrawImage*>* images) const {
   DCHECK_EQ(0u, images->size());
   display_list_->discardable_image_map().GetDiscardableImagesInRect(layer_rect,
                                                                     images);
 }

 base::flat_map<PaintImage::Id, PaintImage::DecodingMode>
 RasterSource::TakeDecodingModeMap() {
   return display_list_->TakeDecodingModeMap();
 }

 bool RasterSource::CoversRect(const gfx::Rect& layer_rect) const {
   if (size_.IsEmpty())
     return false;
   gfx::Rect bounded_rect = layer_rect;
   bounded_rect.Intersect(gfx::Rect(size_));
   return recorded_viewport_.Contains(bounded_rect);
 }

 gfx::Size RasterSource::GetSize() const {
   return size_;
 }

 gfx::Size RasterSource::GetContentSize(float content_scale) const {
   return gfx::ScaleToCeiledSize(GetSize(), content_scale);
 }

 bool RasterSource::IsSolidColor() const {
   return is_solid_color_;
 }

 SkColor RasterSource::GetSolidColor() const {
   DCHECK(IsSolidColor());
   return solid_color_;
 }

 bool RasterSource::HasRecordings() const {
   return !!display_list_.get();
 }

 gfx::Rect RasterSource::RecordedViewport() const {
   return recorded_viewport_;
 }

 void RasterSource::AsValueInto(base::trace_event::TracedValue* array) const {
   if (display_list_.get())
     viz::TracedValue::AppendIDRef(display_list_.get(), array);
 }

 void RasterSource::DidBeginTracing() {
   if (display_list_.get())
     display_list_->EmitTraceSnapshot();
 }

 RasterSource::PlaybackSettings::PlaybackSettings() = default;

 RasterSource::PlaybackSettings::PlaybackSettings(const PlaybackSettings&) =
     default;

 RasterSource::PlaybackSettings::PlaybackSettings(PlaybackSettings&&) = default;

 RasterSource::PlaybackSettings::~PlaybackSettings() = default;

 }  // namespace cc
	// Copyright 2014 The Chromium Authors. All rights reserved.
	// Use of this source code is governed by a BSD-style license that can be
	// found in the LICENSE file.

	#include "cc/raster/raster_source.h"

	#include <stddef.h>

	#include "base/metrics/histogram_macros.h"
	#include "base/trace_event/trace_event.h"
	#include "cc/base/math_util.h"
	#include "cc/base/region.h"
	#include "cc/debug/debug_colors.h"
	#include "cc/paint/display_item_list.h"
	#include "cc/paint/image_provider.h"
	#include "cc/paint/skia_paint_canvas.h"
	#include "components/viz/common/traced_value.h"
	#include "third_party/skia/include/core/SkCanvas.h"
	#include "ui/gfx/geometry/axis_transform2d.h"
	#include "ui/gfx/geometry/rect_conversions.h"

	namespace cc {

	RasterSource::RasterSource(const RecordingSource* other)
	: display_list_(other->display_list_),
	painter_reported_memory_usage_(other->painter_reported_memory_usage_),
	background_color_(other->background_color_),
	requires_clear_(other->requires_clear_),
	is_solid_color_(other->is_solid_color_),
	solid_color_(other->solid_color_),
	recorded_viewport_(other->recorded_viewport_),
	size_(other->size_),
	slow_down_raster_scale_factor_for_debug_(
	other->slow_down_raster_scale_factor_for_debug_),
	recording_scale_factor_(other->recording_scale_factor_) {}

	RasterSource::~RasterSource() = default;

	void RasterSource::ClearForOpaqueRaster(
	SkCanvas* raster_canvas,
	const gfx::Size& content_size,
	const gfx::Rect& canvas_bitmap_rect,
	const gfx::Rect& canvas_playback_rect) const {
	// The last texel of this content is not guaranteed to be fully opaque, so
	// inset by one to generate the fully opaque coverage rect. This rect is
	// in device space.
	SkIRect coverage_device_rect =
	SkIRect::MakeWH(content_size.width() - canvas_bitmap_rect.x() - 1,
	content_size.height() - canvas_bitmap_rect.y() - 1);

	// If not fully covered, we need to clear one texel inside the coverage
	// rect (because of blending during raster) and one texel outside the canvas
	// bitmap rect (because of bilinear filtering during draw). See comments
	// in RasterSource.
	SkIRect device_column = SkIRect::MakeXYWH(coverage_device_rect.right(), 0, 2,
	coverage_device_rect.bottom());
	// row includes the corner, column excludes it.
	SkIRect device_row = SkIRect::MakeXYWH(0, coverage_device_rect.bottom(),
	coverage_device_rect.right() + 2, 2);

	bool right_edge = content_size.width() == canvas_playback_rect.right();
	bool bottom_edge = content_size.height() == canvas_playback_rect.bottom();

	// If the playback rect is touching either edge of the content rect
	// extend it by one pixel to include the extra texel outside the canvas
	// bitmap rect that was added to device column and row above.
	SkIRect playback_device_rect =
	SkIRect::MakeXYWH(canvas_playback_rect.x() - canvas_bitmap_rect.x(),
	canvas_playback_rect.y() - canvas_bitmap_rect.y(),
	canvas_playback_rect.width() + (right_edge ? 1 : 0),
	canvas_playback_rect.height() + (bottom_edge ? 1 : 0));

	// Intersect the device column and row with the playback rect and only
	// clear inside of that rect if needed.
	if (device_column.intersect(playback_device_rect)) {
	raster_canvas->save();
	raster_canvas->clipRect(SkRect::Make(device_column), SkClipOp::kIntersect,
	false);
	raster_canvas->drawColor(background_color_, SkBlendMode::kSrc);
	raster_canvas->restore();
	}
	if (device_row.intersect(playback_device_rect)) {
	raster_canvas->save();
	raster_canvas->clipRect(SkRect::Make(device_row), SkClipOp::kIntersect,
	false);
	raster_canvas->drawColor(background_color_, SkBlendMode::kSrc);
	raster_canvas->restore();
	}
	}

	void RasterSource::PlaybackToCanvas(
	SkCanvas* raster_canvas,
	const gfx::Size& content_size,
	const gfx::Rect& canvas_bitmap_rect,
	const gfx::Rect& canvas_playback_rect,
	const gfx::AxisTransform2d& raster_transform,
	const PlaybackSettings& settings) const {
	SkIRect raster_bounds = gfx::RectToSkIRect(canvas_bitmap_rect);
	if (!canvas_playback_rect.IsEmpty() &&
	!raster_bounds.intersect(gfx::RectToSkIRect(canvas_playback_rect)))
	return;
	// Treat all subnormal values as zero for performance.
	ScopedSubnormalFloatDisabler disabler;

	bool is_partial_raster = canvas_bitmap_rect != canvas_playback_rect;
	if (!requires_clear_) {
	// Clear opaque raster sources. Opaque rasters sources guarantee that all
	// pixels inside the opaque region are painted. However, due to scaling
	// it's possible that the last row and column might include pixels that
	// are not painted. Because this raster source is required to be opaque,
	// we may need to do extra clearing outside of the clip. This needs to
	// be done for both full and partial raster.
	ClearForOpaqueRaster(raster_canvas, content_size, canvas_bitmap_rect,
	canvas_playback_rect);
	} else if (!is_partial_raster) {
	// For non-opaque raster sources that are rastering the full tile,
	// just clear the entire canvas (even if stretches past the canvas
	// bitmap rect) as it's cheap to do so.
	raster_canvas->clear(SK_ColorTRANSPARENT);
	}

	raster_canvas->save();
	raster_canvas->translate(-canvas_bitmap_rect.x(), -canvas_bitmap_rect.y());
	raster_canvas->clipRect(SkRect::Make(raster_bounds));
	raster_canvas->translate(raster_transform.translation().x(),
	raster_transform.translation().y());
	raster_canvas->scale(raster_transform.scale() / recording_scale_factor_,
	raster_transform.scale() / recording_scale_factor_);

	if (is_partial_raster && requires_clear_) {
	// Because Skia treats painted regions as transparent by default, we don't
	// need to clear outside of the playback rect in the same way that
	// ClearForOpaqueRaster must handle.
	raster_canvas->clear(SK_ColorTRANSPARENT);
	}

	PlaybackToCanvas(raster_canvas, settings.image_provider);
	raster_canvas->restore();
	}

	void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
	ImageProvider* image_provider) const {
	// TODO(enne): Temporary CHECK debugging for http://crbug.com/823835
	CHECK(display_list_.get());
	int repeat_count = std::max(1, slow_down_raster_scale_factor_for_debug_);
	for (int i = 0; i < repeat_count; ++i)
	display_list_->Raster(raster_canvas, image_provider);
	}

	size_t RasterSource::GetMemoryUsage() const {
	if (!display_list_)
	return 0;
	return display_list_->BytesUsed() + painter_reported_memory_usage_;
	}

	bool RasterSource::PerformSolidColorAnalysis(gfx::Rect layer_rect,
	SkColor* color) const {
	TRACE_EVENT0("cc", "RasterSource::PerformSolidColorAnalysis");

	layer_rect.Intersect(gfx::Rect(size_));
	layer_rect = gfx::ScaleToRoundedRect(layer_rect, recording_scale_factor_);
	return display_list_->GetColorIfSolidInRect(layer_rect, color);
	}

	void RasterSource::GetDiscardableImagesInRect(
	const gfx::Rect& layer_rect,
	std::vector<const DrawImage> images) const {
	DCHECK_EQ(0u, images->size());
	display_list_->discardable_image_map().GetDiscardableImagesInRect(layer_rect,
	images);
	}

	base::flat_map<PaintImage::Id, PaintImage::DecodingMode>
	RasterSource::TakeDecodingModeMap() {
	return display_list_->TakeDecodingModeMap();
	}

	bool RasterSource::CoversRect(const gfx::Rect& layer_rect) const {
	if (size_.IsEmpty())
	return false;
	gfx::Rect bounded_rect = layer_rect;
	bounded_rect.Intersect(gfx::Rect(size_));
	return recorded_viewport_.Contains(bounded_rect);
	}

	gfx::Size RasterSource::GetSize() const {
	return size_;
	}

	gfx::Size RasterSource::GetContentSize(float content_scale) const {
	return gfx::ScaleToCeiledSize(GetSize(), content_scale);
	}

	bool RasterSource::IsSolidColor() const {
	return is_solid_color_;
	}

	SkColor RasterSource::GetSolidColor() const {
	DCHECK(IsSolidColor());
	return solid_color_;
	}

	bool RasterSource::HasRecordings() const {
	return !!display_list_.get();
	}

	gfx::Rect RasterSource::RecordedViewport() const {
	return recorded_viewport_;
	}

	void RasterSource::AsValueInto(base::trace_event::TracedValue* array) const {
	if (display_list_.get())
	viz::TracedValue::AppendIDRef(display_list_.get(), array);
	}

	void RasterSource::DidBeginTracing() {
	if (display_list_.get())
	display_list_->EmitTraceSnapshot();
	}

	RasterSource::PlaybackSettings::PlaybackSettings() = default;

	RasterSource::PlaybackSettings::PlaybackSettings(const PlaybackSettings&) =
	default;

	RasterSource::PlaybackSettings::PlaybackSettings(PlaybackSettings&&) = default;

	RasterSource::PlaybackSettings::~PlaybackSettings() = default;

	} // namespace cc