cc/playback/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/playback/raster_source.h"

 #include <stddef.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/playback/display_item_list.h"
 #include "cc/playback/image_hijack_canvas.h"
 #include "cc/playback/skip_image_canvas.h"
 #include "skia/ext/analysis_canvas.h"
 #include "third_party/skia/include/core/SkCanvas.h"
 #include "third_party/skia/include/core/SkClipStack.h"
 #include "third_party/skia/include/core/SkPictureRecorder.h"
 #include "ui/gfx/geometry/rect_conversions.h"

 namespace cc {

 scoped_refptr<RasterSource> RasterSource::CreateFromRecordingSource(
     const RecordingSource* other,
     bool can_use_lcd_text) {
   return make_scoped_refptr(new RasterSource(other, can_use_lcd_text));
 }

 RasterSource::RasterSource(const RecordingSource* other, bool can_use_lcd_text)
     : display_list_(other->display_list_),
       painter_reported_memory_usage_(other->painter_reported_memory_usage_),
       background_color_(other->background_color_),
       requires_clear_(other->requires_clear_),
       can_use_lcd_text_(can_use_lcd_text),
       is_solid_color_(other->is_solid_color_),
       solid_color_(other->solid_color_),
       recorded_viewport_(other->recorded_viewport_),
       size_(other->size_),
       clear_canvas_with_debug_color_(other->clear_canvas_with_debug_color_),
       slow_down_raster_scale_factor_for_debug_(
           other->slow_down_raster_scale_factor_for_debug_),
       should_attempt_to_use_distance_field_text_(false),
       image_decode_cache_(nullptr) {}

 RasterSource::RasterSource(const RasterSource* other, bool can_use_lcd_text)
     : display_list_(other->display_list_),
       painter_reported_memory_usage_(other->painter_reported_memory_usage_),
       background_color_(other->background_color_),
       requires_clear_(other->requires_clear_),
       can_use_lcd_text_(can_use_lcd_text),
       is_solid_color_(other->is_solid_color_),
       solid_color_(other->solid_color_),
       recorded_viewport_(other->recorded_viewport_),
       size_(other->size_),
       clear_canvas_with_debug_color_(other->clear_canvas_with_debug_color_),
       slow_down_raster_scale_factor_for_debug_(
           other->slow_down_raster_scale_factor_for_debug_),
       should_attempt_to_use_distance_field_text_(
           other->should_attempt_to_use_distance_field_text_),
       image_decode_cache_(other->image_decode_cache_) {}

 RasterSource::~RasterSource() {
 }

 void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
                                     const gfx::Rect& canvas_bitmap_rect,
                                     const gfx::Rect& canvas_playback_rect,
                                     const gfx::SizeF& raster_scales,
                                     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;

   raster_canvas->save();
   raster_canvas->translate(-canvas_bitmap_rect.x(), -canvas_bitmap_rect.y());
   raster_canvas->clipRect(SkRect::MakeFromIRect(raster_bounds));
   raster_canvas->scale(raster_scales.width(), raster_scales.height());
   PlaybackToCanvas(raster_canvas, settings);
   raster_canvas->restore();
 }

 void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
                                     const PlaybackSettings& settings) const {
   if (!settings.playback_to_shared_canvas)
     PrepareForPlaybackToCanvas(raster_canvas);

   if (settings.skip_images) {
     SkipImageCanvas canvas(raster_canvas);
     RasterCommon(&canvas, nullptr);
   } else if (settings.use_image_hijack_canvas) {
     const SkImageInfo& info = raster_canvas->imageInfo();

     ImageHijackCanvas canvas(info.width(), info.height(), image_decode_cache_);
     // Before adding the canvas, make sure that the ImageHijackCanvas is aware
     // of the current transform and clip, which may affect the clip bounds.
     // Since we query the clip bounds of the current canvas to get the list of
     // draw commands to process, this is important to produce correct content.
     SkIRect raster_bounds;
     raster_canvas->getClipDeviceBounds(&raster_bounds);
     canvas.clipRect(SkRect::MakeFromIRect(raster_bounds));
     canvas.setMatrix(raster_canvas->getTotalMatrix());
     canvas.addCanvas(raster_canvas);

     RasterCommon(&canvas, nullptr);
   } else {
     RasterCommon(raster_canvas, nullptr);
   }
 }

 void RasterSource::PrepareForPlaybackToCanvas(SkCanvas* canvas) const {
   // TODO(hendrikw): See if we can split this up into separate functions.

   if (canvas->getClipStack()->quickContains(
           SkRect::MakeFromIRect(canvas->imageInfo().bounds()))) {
     canvas->discard();
   }

   // If this raster source has opaque contents, it is guaranteeing that it will
   // draw an opaque rect the size of the layer.  If it is not, then we must
   // clear this canvas ourselves.
   if (requires_clear_) {
     canvas->clear(SK_ColorTRANSPARENT);
     return;
   }

   if (clear_canvas_with_debug_color_)
     canvas->clear(DebugColors::NonPaintedFillColor());

   // If the canvas wants us to raster with complex transform, it is hard to
   // determine the exact region we must clear. Just clear everything.
   // TODO(trchen): Optimize the common case that transformed content bounds
   //               covers the whole clip region.
   if (!canvas->getTotalMatrix().rectStaysRect()) {
     canvas->clear(SK_ColorTRANSPARENT);
     return;
   }

   SkRect content_device_rect;
   canvas->getTotalMatrix().mapRect(
       &content_device_rect, SkRect::MakeWH(size_.width(), size_.height()));

   // The final texel of content may only be partially covered by a
   // rasterization; this rect represents the content rect that is fully
   // covered by content.
   SkIRect opaque_rect;
   content_device_rect.roundIn(&opaque_rect);

   SkIRect raster_bounds;
   canvas->getClipDeviceBounds(&raster_bounds);

   if (opaque_rect.contains(raster_bounds))
     return;

   // Even if completely covered, for rasterizations that touch the edge of the
   // layer, we also need to raster the background color underneath the last
   // texel (since the recording won't cover it) and outside the last texel
   // (due to linear filtering when using this texture).
   SkIRect interest_rect;
   content_device_rect.roundOut(&interest_rect);
   interest_rect.outset(1, 1);

   if (clear_canvas_with_debug_color_) {
     // Any non-painted areas outside of the content bounds are left in
     // this color.  If this is seen then it means that cc neglected to
     // rerasterize a tile that used to intersect with the content rect
     // after the content bounds grew.
     canvas->save();
     // Use clipRegion to bypass CTM because the rects are device rects.
     SkRegion interest_region;
     interest_region.setRect(interest_rect);
     canvas->clipRegion(interest_region, kDifference_SkClipOp);
     canvas->clear(DebugColors::MissingResizeInvalidations());
     canvas->restore();
   }

   // Drawing at most 2 x 2 x (canvas width + canvas height) texels is 2-3X
   // faster than clearing, so special case this.
   canvas->save();
   // Use clipRegion to bypass CTM because the rects are device rects.
   SkRegion interest_region;
   interest_region.setRect(interest_rect);
   interest_region.op(opaque_rect, SkRegion::kDifference_Op);
   canvas->clipRegion(interest_region);
   canvas->clear(background_color_);
   canvas->restore();
 }

 void RasterSource::RasterCommon(SkCanvas* canvas,
                                 SkPicture::AbortCallback* callback) const {
   DCHECK(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(canvas, callback);
 }

 sk_sp<SkPicture> RasterSource::GetFlattenedPicture() {
   TRACE_EVENT0("cc", "RasterSource::GetFlattenedPicture");

   SkPictureRecorder recorder;
   SkCanvas* canvas = recorder.beginRecording(size_.width(), size_.height());
   if (!size_.IsEmpty()) {
     PrepareForPlaybackToCanvas(canvas);
     RasterCommon(canvas, nullptr);
   }

   return recorder.finishRecordingAsPicture();
 }

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

 bool RasterSource::PerformSolidColorAnalysis(const gfx::Rect& content_rect,
                                              const gfx::SizeF& raster_scales,
                                              SkColor* color) const {
   TRACE_EVENT0("cc", "RasterSource::PerformSolidColorAnalysis");

   gfx::Rect layer_rect = gfx::ScaleToEnclosingRect(
       content_rect, 1.f / raster_scales.width(), 1.f / raster_scales.height());

   layer_rect.Intersect(gfx::Rect(size_));
   skia::AnalysisCanvas canvas(layer_rect.width(), layer_rect.height());
   canvas.translate(-layer_rect.x(), -layer_rect.y());
   RasterCommon(&canvas, &canvas);
   return canvas.GetColorIfSolid(color);
 }

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

 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_;
 }

 bool RasterSource::HasImpliedColorSpace() const {
   return display_list_->HasImpliedColorSpace();
 }

 const gfx::ColorSpace& RasterSource::GetImpliedColorSpace() const {
   return display_list_->GetImpliedColorSpace();
 }

 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::SetShouldAttemptToUseDistanceFieldText() {
   should_attempt_to_use_distance_field_text_ = true;
 }

 bool RasterSource::ShouldAttemptToUseDistanceFieldText() const {
   return should_attempt_to_use_distance_field_text_;
 }

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

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

 bool RasterSource::CanUseLCDText() const {
   return can_use_lcd_text_;
 }

 scoped_refptr<RasterSource> RasterSource::CreateCloneWithoutLCDText() const {
   bool can_use_lcd_text = false;
   return scoped_refptr<RasterSource>(new RasterSource(this, can_use_lcd_text));
 }

 RasterSource::PlaybackSettings::PlaybackSettings()
     : playback_to_shared_canvas(false),
       skip_images(false),
       use_image_hijack_canvas(true) {}

 }  // 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/playback/raster_source.h"

	#include <stddef.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/playback/display_item_list.h"
	#include "cc/playback/image_hijack_canvas.h"
	#include "cc/playback/skip_image_canvas.h"
	#include "skia/ext/analysis_canvas.h"
	#include "third_party/skia/include/core/SkCanvas.h"
	#include "third_party/skia/include/core/SkClipStack.h"
	#include "third_party/skia/include/core/SkPictureRecorder.h"
	#include "ui/gfx/geometry/rect_conversions.h"

	namespace cc {

	scoped_refptr<RasterSource> RasterSource::CreateFromRecordingSource(
	const RecordingSource* other,
	bool can_use_lcd_text) {
	return make_scoped_refptr(new RasterSource(other, can_use_lcd_text));
	}

	RasterSource::RasterSource(const RecordingSource* other, bool can_use_lcd_text)
	: display_list_(other->display_list_),
	painter_reported_memory_usage_(other->painter_reported_memory_usage_),
	background_color_(other->background_color_),
	requires_clear_(other->requires_clear_),
	can_use_lcd_text_(can_use_lcd_text),
	is_solid_color_(other->is_solid_color_),
	solid_color_(other->solid_color_),
	recorded_viewport_(other->recorded_viewport_),
	size_(other->size_),
	clear_canvas_with_debug_color_(other->clear_canvas_with_debug_color_),
	slow_down_raster_scale_factor_for_debug_(
	other->slow_down_raster_scale_factor_for_debug_),
	should_attempt_to_use_distance_field_text_(false),
	image_decode_cache_(nullptr) {}

	RasterSource::RasterSource(const RasterSource* other, bool can_use_lcd_text)
	: display_list_(other->display_list_),
	painter_reported_memory_usage_(other->painter_reported_memory_usage_),
	background_color_(other->background_color_),
	requires_clear_(other->requires_clear_),
	can_use_lcd_text_(can_use_lcd_text),
	is_solid_color_(other->is_solid_color_),
	solid_color_(other->solid_color_),
	recorded_viewport_(other->recorded_viewport_),
	size_(other->size_),
	clear_canvas_with_debug_color_(other->clear_canvas_with_debug_color_),
	slow_down_raster_scale_factor_for_debug_(
	other->slow_down_raster_scale_factor_for_debug_),
	should_attempt_to_use_distance_field_text_(
	other->should_attempt_to_use_distance_field_text_),
	image_decode_cache_(other->image_decode_cache_) {}

	RasterSource::~RasterSource() {
	}

	void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
	const gfx::Rect& canvas_bitmap_rect,
	const gfx::Rect& canvas_playback_rect,
	const gfx::SizeF& raster_scales,
	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;

	raster_canvas->save();
	raster_canvas->translate(-canvas_bitmap_rect.x(), -canvas_bitmap_rect.y());
	raster_canvas->clipRect(SkRect::MakeFromIRect(raster_bounds));
	raster_canvas->scale(raster_scales.width(), raster_scales.height());
	PlaybackToCanvas(raster_canvas, settings);
	raster_canvas->restore();
	}

	void RasterSource::PlaybackToCanvas(SkCanvas* raster_canvas,
	const PlaybackSettings& settings) const {
	if (!settings.playback_to_shared_canvas)
	PrepareForPlaybackToCanvas(raster_canvas);

	if (settings.skip_images) {
	SkipImageCanvas canvas(raster_canvas);
	RasterCommon(&canvas, nullptr);
	} else if (settings.use_image_hijack_canvas) {
	const SkImageInfo& info = raster_canvas->imageInfo();

	ImageHijackCanvas canvas(info.width(), info.height(), image_decode_cache_);
	// Before adding the canvas, make sure that the ImageHijackCanvas is aware
	// of the current transform and clip, which may affect the clip bounds.
	// Since we query the clip bounds of the current canvas to get the list of
	// draw commands to process, this is important to produce correct content.
	SkIRect raster_bounds;
	raster_canvas->getClipDeviceBounds(&raster_bounds);
	canvas.clipRect(SkRect::MakeFromIRect(raster_bounds));
	canvas.setMatrix(raster_canvas->getTotalMatrix());
	canvas.addCanvas(raster_canvas);

	RasterCommon(&canvas, nullptr);
	} else {
	RasterCommon(raster_canvas, nullptr);
	}
	}

	void RasterSource::PrepareForPlaybackToCanvas(SkCanvas* canvas) const {
	// TODO(hendrikw): See if we can split this up into separate functions.

	if (canvas->getClipStack()->quickContains(
	SkRect::MakeFromIRect(canvas->imageInfo().bounds()))) {
	canvas->discard();
	}

	// If this raster source has opaque contents, it is guaranteeing that it will
	// draw an opaque rect the size of the layer. If it is not, then we must
	// clear this canvas ourselves.
	if (requires_clear_) {
	canvas->clear(SK_ColorTRANSPARENT);
	return;
	}

	if (clear_canvas_with_debug_color_)
	canvas->clear(DebugColors::NonPaintedFillColor());

	// If the canvas wants us to raster with complex transform, it is hard to
	// determine the exact region we must clear. Just clear everything.
	// TODO(trchen): Optimize the common case that transformed content bounds
	// covers the whole clip region.
	if (!canvas->getTotalMatrix().rectStaysRect()) {
	canvas->clear(SK_ColorTRANSPARENT);
	return;
	}

	SkRect content_device_rect;
	canvas->getTotalMatrix().mapRect(
	&content_device_rect, SkRect::MakeWH(size_.width(), size_.height()));

	// The final texel of content may only be partially covered by a
	// rasterization; this rect represents the content rect that is fully
	// covered by content.
	SkIRect opaque_rect;
	content_device_rect.roundIn(&opaque_rect);

	SkIRect raster_bounds;
	canvas->getClipDeviceBounds(&raster_bounds);

	if (opaque_rect.contains(raster_bounds))
	return;

	// Even if completely covered, for rasterizations that touch the edge of the
	// layer, we also need to raster the background color underneath the last
	// texel (since the recording won't cover it) and outside the last texel
	// (due to linear filtering when using this texture).
	SkIRect interest_rect;
	content_device_rect.roundOut(&interest_rect);
	interest_rect.outset(1, 1);

	if (clear_canvas_with_debug_color_) {
	// Any non-painted areas outside of the content bounds are left in
	// this color. If this is seen then it means that cc neglected to
	// rerasterize a tile that used to intersect with the content rect
	// after the content bounds grew.
	canvas->save();
	// Use clipRegion to bypass CTM because the rects are device rects.
	SkRegion interest_region;
	interest_region.setRect(interest_rect);
	canvas->clipRegion(interest_region, kDifference_SkClipOp);
	canvas->clear(DebugColors::MissingResizeInvalidations());
	canvas->restore();
	}

	// Drawing at most 2 x 2 x (canvas width + canvas height) texels is 2-3X
	// faster than clearing, so special case this.
	canvas->save();
	// Use clipRegion to bypass CTM because the rects are device rects.
	SkRegion interest_region;
	interest_region.setRect(interest_rect);
	interest_region.op(opaque_rect, SkRegion::kDifference_Op);
	canvas->clipRegion(interest_region);
	canvas->clear(background_color_);
	canvas->restore();
	}

	void RasterSource::RasterCommon(SkCanvas* canvas,
	SkPicture::AbortCallback* callback) const {
	DCHECK(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(canvas, callback);
	}

	sk_sp<SkPicture> RasterSource::GetFlattenedPicture() {
	TRACE_EVENT0("cc", "RasterSource::GetFlattenedPicture");

	SkPictureRecorder recorder;
	SkCanvas* canvas = recorder.beginRecording(size_.width(), size_.height());
	if (!size_.IsEmpty()) {
	PrepareForPlaybackToCanvas(canvas);
	RasterCommon(canvas, nullptr);
	}

	return recorder.finishRecordingAsPicture();
	}

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

	bool RasterSource::PerformSolidColorAnalysis(const gfx::Rect& content_rect,
	const gfx::SizeF& raster_scales,
	SkColor* color) const {
	TRACE_EVENT0("cc", "RasterSource::PerformSolidColorAnalysis");

	gfx::Rect layer_rect = gfx::ScaleToEnclosingRect(
	content_rect, 1.f / raster_scales.width(), 1.f / raster_scales.height());

	layer_rect.Intersect(gfx::Rect(size_));
	skia::AnalysisCanvas canvas(layer_rect.width(), layer_rect.height());
	canvas.translate(-layer_rect.x(), -layer_rect.y());
	RasterCommon(&canvas, &canvas);
	return canvas.GetColorIfSolid(color);
	}

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

	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_;
	}

	bool RasterSource::HasImpliedColorSpace() const {
	return display_list_->HasImpliedColorSpace();
	}

	const gfx::ColorSpace& RasterSource::GetImpliedColorSpace() const {
	return display_list_->GetImpliedColorSpace();
	}

	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::SetShouldAttemptToUseDistanceFieldText() {
	should_attempt_to_use_distance_field_text_ = true;
	}

	bool RasterSource::ShouldAttemptToUseDistanceFieldText() const {
	return should_attempt_to_use_distance_field_text_;
	}

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

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

	bool RasterSource::CanUseLCDText() const {
	return can_use_lcd_text_;
	}

	scoped_refptr<RasterSource> RasterSource::CreateCloneWithoutLCDText() const {
	bool can_use_lcd_text = false;
	return scoped_refptr<RasterSource>(new RasterSource(this, can_use_lcd_text));
	}

	RasterSource::PlaybackSettings::PlaybackSettings()
	: playback_to_shared_canvas(false),
	skip_images(false),
	use_image_hijack_canvas(true) {}

	} // namespace cc