Revert "Delete CC."

cc/output/software_renderer.cc

+// Copyright 2012 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/output/software_renderer.h"
+
+#include "base/trace_event/trace_event.h"
+#include "cc/base/math_util.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/compositor_frame_ack.h"
+#include "cc/output/compositor_frame_metadata.h"
+#include "cc/output/copy_output_request.h"
+#include "cc/output/output_surface.h"
+#include "cc/output/render_surface_filters.h"
+#include "cc/output/software_output_device.h"
+#include "cc/quads/checkerboard_draw_quad.h"
+#include "cc/quads/debug_border_draw_quad.h"
+#include "cc/quads/render_pass_draw_quad.h"
+#include "cc/quads/solid_color_draw_quad.h"
+#include "cc/quads/texture_draw_quad.h"
+#include "cc/quads/tile_draw_quad.h"
+#include "skia/ext/opacity_draw_filter.h"
+#include "third_party/skia/include/core/SkCanvas.h"
+#include "third_party/skia/include/core/SkColor.h"
+#include "third_party/skia/include/core/SkImageFilter.h"
+#include "third_party/skia/include/core/SkMatrix.h"
+#include "third_party/skia/include/core/SkPath.h"
+#include "third_party/skia/include/core/SkPoint.h"
+#include "third_party/skia/include/core/SkShader.h"
+#include "third_party/skia/include/effects/SkLayerRasterizer.h"
+#include "ui/gfx/geometry/rect_conversions.h"
+#include "ui/gfx/skia_util.h"
+#include "ui/gfx/transform.h"
+
+namespace cc {
+namespace {
+
+static inline bool IsScalarNearlyInteger(SkScalar scalar) {
+  return SkScalarNearlyZero(scalar - SkScalarRoundToScalar(scalar));
+}
+
+bool IsScaleAndIntegerTranslate(const SkMatrix& matrix) {
+  return IsScalarNearlyInteger(matrix[SkMatrix::kMTransX]) &&
+         IsScalarNearlyInteger(matrix[SkMatrix::kMTransY]) &&
+         SkScalarNearlyZero(matrix[SkMatrix::kMSkewX]) &&
+         SkScalarNearlyZero(matrix[SkMatrix::kMSkewY]) &&
+         SkScalarNearlyZero(matrix[SkMatrix::kMPersp0]) &&
+         SkScalarNearlyZero(matrix[SkMatrix::kMPersp1]) &&
+         SkScalarNearlyZero(matrix[SkMatrix::kMPersp2] - 1.0f);
+}
+
+static SkShader::TileMode WrapModeToTileMode(GLint wrap_mode) {
+  switch (wrap_mode) {
+    case GL_REPEAT:
+      return SkShader::kRepeat_TileMode;
+    case GL_CLAMP_TO_EDGE:
+      return SkShader::kClamp_TileMode;
+  }
+  NOTREACHED();
+  return SkShader::kClamp_TileMode;
+}
+
+}  // anonymous namespace
+
+scoped_ptr<SoftwareRenderer> SoftwareRenderer::Create(
+    RendererClient* client,
+    const RendererSettings* settings,
+    OutputSurface* output_surface,
+    ResourceProvider* resource_provider) {
+  return make_scoped_ptr(new SoftwareRenderer(
+      client, settings, output_surface, resource_provider));
+}
+
+SoftwareRenderer::SoftwareRenderer(RendererClient* client,
+                                   const RendererSettings* settings,
+                                   OutputSurface* output_surface,
+                                   ResourceProvider* resource_provider)
+    : DirectRenderer(client, settings, output_surface, resource_provider),
+      is_scissor_enabled_(false),
+      is_backbuffer_discarded_(false),
+      output_device_(output_surface->software_device()),
+      current_canvas_(NULL) {
+  if (resource_provider_) {
+    capabilities_.max_texture_size = resource_provider_->max_texture_size();
+    capabilities_.best_texture_format =
+        resource_provider_->best_texture_format();
+  }
+  // The updater can access bitmaps while the SoftwareRenderer is using them.
+  capabilities_.allow_partial_texture_updates = true;
+  capabilities_.using_partial_swap = true;
+
+  capabilities_.using_shared_memory_resources = true;
+
+  capabilities_.allow_rasterize_on_demand = true;
+}
+
+SoftwareRenderer::~SoftwareRenderer() {}
+
+const RendererCapabilitiesImpl& SoftwareRenderer::Capabilities() const {
+  return capabilities_;
+}
+
+void SoftwareRenderer::BeginDrawingFrame(DrawingFrame* frame) {
+  TRACE_EVENT0("cc", "SoftwareRenderer::BeginDrawingFrame");
+  root_canvas_ = output_device_->BeginPaint(
+      gfx::ToEnclosingRect(frame->root_damage_rect));
+}
+
+void SoftwareRenderer::FinishDrawingFrame(DrawingFrame* frame) {
+  TRACE_EVENT0("cc", "SoftwareRenderer::FinishDrawingFrame");
+  current_framebuffer_lock_ = nullptr;
+  current_framebuffer_canvas_.clear();
+  current_canvas_ = NULL;
+  root_canvas_ = NULL;
+
+  current_frame_data_.reset(new SoftwareFrameData);
+  output_device_->EndPaint(current_frame_data_.get());
+}
+
+void SoftwareRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
+  TRACE_EVENT0("cc,benchmark", "SoftwareRenderer::SwapBuffers");
+  CompositorFrame compositor_frame;
+  compositor_frame.metadata = metadata;
+  compositor_frame.software_frame_data = current_frame_data_.Pass();
+  output_surface_->SwapBuffers(&compositor_frame);
+}
+
+void SoftwareRenderer::ReceiveSwapBuffersAck(const CompositorFrameAck& ack) {
+  output_device_->ReclaimSoftwareFrame(ack.last_software_frame_id);
+}
+
+bool SoftwareRenderer::FlippedFramebuffer(const DrawingFrame* frame) const {
+  return false;
+}
+
+void SoftwareRenderer::EnsureScissorTestEnabled() {
+  is_scissor_enabled_ = true;
+  SetClipRect(scissor_rect_);
+}
+
+void SoftwareRenderer::EnsureScissorTestDisabled() {
+  // There is no explicit notion of enabling/disabling scissoring in software
+  // rendering, but the underlying effect we want is to clear any existing
+  // clipRect on the current SkCanvas. This is done by setting clipRect to
+  // the viewport's dimensions.
+  is_scissor_enabled_ = false;
+  SkISize size = current_canvas_->getDeviceSize();
+  SetClipRect(gfx::Rect(size.width(), size.height()));
+}
+
+void SoftwareRenderer::Finish() {}
+
+void SoftwareRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
+  DCHECK(!output_surface_->HasExternalStencilTest());
+  current_framebuffer_lock_ = nullptr;
+  current_framebuffer_canvas_.clear();
+  current_canvas_ = root_canvas_;
+}
+
+bool SoftwareRenderer::BindFramebufferToTexture(
+    DrawingFrame* frame,
+    const ScopedResource* texture,
+    const gfx::Rect& target_rect) {
+  DCHECK(texture->id());
+
+  // Explicitly release lock, otherwise we can crash when try to lock
+  // same texture again.
+  current_framebuffer_lock_ = nullptr;
+  current_framebuffer_lock_ = make_scoped_ptr(
+      new ResourceProvider::ScopedWriteLockSoftware(
+          resource_provider_, texture->id()));
+  current_framebuffer_canvas_ =
+      skia::AdoptRef(new SkCanvas(current_framebuffer_lock_->sk_bitmap()));
+  current_canvas_ = current_framebuffer_canvas_.get();
+  return true;
+}
+
+void SoftwareRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
+  is_scissor_enabled_ = true;
+  scissor_rect_ = scissor_rect;
+  SetClipRect(scissor_rect);
+}
+
+void SoftwareRenderer::SetClipRect(const gfx::Rect& rect) {
+  // Skia applies the current matrix to clip rects so we reset it temporary.
+  SkMatrix current_matrix = current_canvas_->getTotalMatrix();
+  current_canvas_->resetMatrix();
+  current_canvas_->clipRect(gfx::RectToSkRect(rect), SkRegion::kReplace_Op);
+  current_canvas_->setMatrix(current_matrix);
+}
+
+void SoftwareRenderer::ClearCanvas(SkColor color) {
+  // SkCanvas::clear doesn't respect the current clipping region
+  // so we SkCanvas::drawColor instead if scissoring is active.
+  if (is_scissor_enabled_)
+    current_canvas_->drawColor(color, SkXfermode::kSrc_Mode);
+  else
+    current_canvas_->clear(color);
+}
+
+void SoftwareRenderer::ClearFramebuffer(DrawingFrame* frame) {
+  if (frame->current_render_pass->has_transparent_background) {
+    ClearCanvas(SkColorSetARGB(0, 0, 0, 0));
+  } else {
+#ifndef NDEBUG
+    // On DEBUG builds, opaque render passes are cleared to blue
+    // to easily see regions that were not drawn on the screen.
+    ClearCanvas(SkColorSetARGB(255, 0, 0, 255));
+#endif
+  }
+}
+
+void SoftwareRenderer::PrepareSurfaceForPass(
+    DrawingFrame* frame,
+    SurfaceInitializationMode initialization_mode,
+    const gfx::Rect& render_pass_scissor) {
+  switch (initialization_mode) {
+    case SURFACE_INITIALIZATION_MODE_PRESERVE:
+      EnsureScissorTestDisabled();
+      return;
+    case SURFACE_INITIALIZATION_MODE_FULL_SURFACE_CLEAR:
+      EnsureScissorTestDisabled();
+      ClearFramebuffer(frame);
+      break;
+    case SURFACE_INITIALIZATION_MODE_SCISSORED_CLEAR:
+      SetScissorTestRect(render_pass_scissor);
+      ClearFramebuffer(frame);
+      break;
+  }
+}
+
+void SoftwareRenderer::SetDrawViewport(
+    const gfx::Rect& window_space_viewport) {}
+
+bool SoftwareRenderer::IsSoftwareResource(
+    ResourceProvider::ResourceId resource_id) const {
+  switch (resource_provider_->GetResourceType(resource_id)) {
+    case ResourceProvider::RESOURCE_TYPE_GL_TEXTURE:
+      return false;
+    case ResourceProvider::RESOURCE_TYPE_BITMAP:
+      return true;
+    case ResourceProvider::RESOURCE_TYPE_INVALID:
+      break;
+  }
+
+  LOG(FATAL) << "Invalid resource type.";
+  return false;
+}
+
+void SoftwareRenderer::DoDrawQuad(DrawingFrame* frame,
+                                  const DrawQuad* quad,
+                                  const gfx::QuadF* draw_region) {
+  if (draw_region) {
+    current_canvas_->save();
+  }
+
+  TRACE_EVENT0("cc", "SoftwareRenderer::DoDrawQuad");
+  gfx::Transform quad_rect_matrix;
+  QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
+  gfx::Transform contents_device_transform =
+      frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
+  contents_device_transform.FlattenTo2d();
+  SkMatrix sk_device_matrix;
+  gfx::TransformToFlattenedSkMatrix(contents_device_transform,
+                                    &sk_device_matrix);
+  current_canvas_->setMatrix(sk_device_matrix);
+
+  current_paint_.reset();
+  if (settings_->force_antialiasing ||
+      !IsScaleAndIntegerTranslate(sk_device_matrix)) {
+    // TODO(danakj): Until we can enable AA only on exterior edges of the
+    // layer, disable AA if any interior edges are present. crbug.com/248175
+    bool all_four_edges_are_exterior = quad->IsTopEdge() &&
+                                       quad->IsLeftEdge() &&
+                                       quad->IsBottomEdge() &&
+                                       quad->IsRightEdge();
+    if (settings_->allow_antialiasing &&
+        (settings_->force_antialiasing || all_four_edges_are_exterior))
+      current_paint_.setAntiAlias(true);
+    current_paint_.setFilterQuality(kLow_SkFilterQuality);
+  }
+
+  if (quad->ShouldDrawWithBlending() ||
+      quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode) {
+    current_paint_.setAlpha(quad->opacity() * 255);
+    current_paint_.setXfermodeMode(quad->shared_quad_state->blend_mode);
+  } else {
+    current_paint_.setXfermodeMode(SkXfermode::kSrc_Mode);
+  }
+
+  if (draw_region) {
+    gfx::QuadF local_draw_region(*draw_region);
+    SkPath draw_region_clip_path;
+    local_draw_region -=
+        gfx::Vector2dF(quad->visible_rect.x(), quad->visible_rect.y());
+    local_draw_region.Scale(1.0f / quad->visible_rect.width(),
+                            1.0f / quad->visible_rect.height());
+    local_draw_region -= gfx::Vector2dF(0.5f, 0.5f);
+
+    SkPoint clip_points[4];
+    QuadFToSkPoints(local_draw_region, clip_points);
+    draw_region_clip_path.addPoly(clip_points, 4, true);
+
+    current_canvas_->clipPath(draw_region_clip_path, SkRegion::kIntersect_Op,
+                              false);
+  }
+
+  switch (quad->material) {
+    case DrawQuad::CHECKERBOARD:
+      // TODO(enne) For now since checkerboards shouldn't be part of a 3D
+      // context, clipping regions aren't supported so we skip drawing them
+      // if this becomes the case.
+      if (!draw_region) {
+        DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad));
+      }
+      break;
+    case DrawQuad::DEBUG_BORDER:
+      DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
+      break;
+    case DrawQuad::RENDER_PASS:
+      DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad));
+      break;
+    case DrawQuad::SOLID_COLOR:
+      DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad));
+      break;
+    case DrawQuad::TEXTURE_CONTENT:
+      DrawTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
+      break;
+    case DrawQuad::TILED_CONTENT:
+      DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad));
+      break;
+    case DrawQuad::SURFACE_CONTENT:
+      // Surface content should be fully resolved to other quad types before
+      // reaching a direct renderer.
+      NOTREACHED();
+      break;
+    case DrawQuad::INVALID:
+    case DrawQuad::IO_SURFACE_CONTENT:
+    case DrawQuad::YUV_VIDEO_CONTENT:
+    case DrawQuad::STREAM_VIDEO_CONTENT:
+    case DrawQuad::UNUSED_SPACE_FOR_PICTURE_CONTENT:
+      DrawUnsupportedQuad(frame, quad);
+      NOTREACHED();
+      break;
+  }
+
+  current_canvas_->resetMatrix();
+  if (draw_region) {
+    current_canvas_->restore();
+  }
+}
+
+void SoftwareRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
+                                            const CheckerboardDrawQuad* quad) {
+  gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
+      QuadVertexRect(), quad->rect, quad->visible_rect);
+  current_paint_.setColor(quad->color);
+  current_paint_.setAlpha(quad->opacity());
+  current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
+                            current_paint_);
+}
+
+void SoftwareRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
+                                           const DebugBorderDrawQuad* quad) {
+  // We need to apply the matrix manually to have pixel-sized stroke width.
+  SkPoint vertices[4];
+  gfx::RectFToSkRect(QuadVertexRect()).toQuad(vertices);
+  SkPoint transformed_vertices[4];
+  current_canvas_->getTotalMatrix().mapPoints(transformed_vertices,
+                                              vertices,
+                                              4);
+  current_canvas_->resetMatrix();
+
+  current_paint_.setColor(quad->color);
+  current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
+  current_paint_.setStyle(SkPaint::kStroke_Style);
+  current_paint_.setStrokeWidth(quad->width);
+  current_canvas_->drawPoints(SkCanvas::kPolygon_PointMode,
+                              4, transformed_vertices, current_paint_);
+}
+
+void SoftwareRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
+                                          const SolidColorDrawQuad* quad) {
+  gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
+      QuadVertexRect(), quad->rect, quad->visible_rect);
+  current_paint_.setColor(quad->color);
+  current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
+  current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
+                            current_paint_);
+}
+
+void SoftwareRenderer::DrawTextureQuad(const DrawingFrame* frame,
+                                       const TextureDrawQuad* quad) {
+  if (!IsSoftwareResource(quad->resource_id)) {
+    DrawUnsupportedQuad(frame, quad);
+    return;
+  }
+
+  // TODO(skaslev): Add support for non-premultiplied alpha.
+  ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
+                                                quad->resource_id);
+  if (!lock.valid())
+    return;
+  const SkBitmap* bitmap = lock.sk_bitmap();
+  gfx::RectF uv_rect = gfx::ScaleRect(gfx::BoundingRect(quad->uv_top_left,
+                                                        quad->uv_bottom_right),
+                                      bitmap->width(),
+                                      bitmap->height());
+  gfx::RectF visible_uv_rect =
+      MathUtil::ScaleRectProportional(uv_rect, quad->rect, quad->visible_rect);
+  SkRect sk_uv_rect = gfx::RectFToSkRect(visible_uv_rect);
+  gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
+      QuadVertexRect(), quad->rect, quad->visible_rect);
+  SkRect quad_rect = gfx::RectFToSkRect(visible_quad_vertex_rect);
+
+  if (quad->flipped)
+    current_canvas_->scale(1, -1);
+
+  bool blend_background = quad->background_color != SK_ColorTRANSPARENT &&
+                          !bitmap->isOpaque();
+  bool needs_layer = blend_background && (current_paint_.getAlpha() != 0xFF);
+  if (needs_layer) {
+    current_canvas_->saveLayerAlpha(&quad_rect, current_paint_.getAlpha());
+    current_paint_.setAlpha(0xFF);
+  }
+  if (blend_background) {
+    SkPaint background_paint;
+    background_paint.setColor(quad->background_color);
+    current_canvas_->drawRect(quad_rect, background_paint);
+  }
+  SkShader::TileMode tile_mode = WrapModeToTileMode(lock.wrap_mode());
+  if (tile_mode != SkShader::kClamp_TileMode) {
+    SkMatrix matrix;
+    matrix.setRectToRect(sk_uv_rect, quad_rect, SkMatrix::kFill_ScaleToFit);
+    skia::RefPtr<SkShader> shader = skia::AdoptRef(
+        SkShader::CreateBitmapShader(*bitmap, tile_mode, tile_mode, &matrix));
+    SkPaint paint;
+    paint.setStyle(SkPaint::kFill_Style);
+    paint.setShader(shader.get());
+    current_canvas_->drawRect(quad_rect, paint);
+  } else {
+    current_canvas_->drawBitmapRect(*bitmap, sk_uv_rect, quad_rect,
+                                    &current_paint_);
+  }
+
+  if (needs_layer)
+    current_canvas_->restore();
+}
+
+void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
+                                    const TileDrawQuad* quad) {
+  // |resource_provider_| can be NULL in resourceless software draws, which
+  // should never produce tile quads in the first place.
+  DCHECK(resource_provider_);
+  DCHECK(IsSoftwareResource(quad->resource_id));
+
+  ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
+                                                quad->resource_id);
+  if (!lock.valid())
+    return;
+  DCHECK_EQ(GL_CLAMP_TO_EDGE, lock.wrap_mode());
+
+  gfx::RectF visible_tex_coord_rect = MathUtil::ScaleRectProportional(
+      quad->tex_coord_rect, quad->rect, quad->visible_rect);
+  gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
+      QuadVertexRect(), quad->rect, quad->visible_rect);
+
+  SkRect uv_rect = gfx::RectFToSkRect(visible_tex_coord_rect);
+  current_paint_.setFilterQuality(
+      quad->nearest_neighbor ? kNone_SkFilterQuality : kLow_SkFilterQuality);
+  current_canvas_->drawBitmapRect(*lock.sk_bitmap(), uv_rect,
+                                  gfx::RectFToSkRect(visible_quad_vertex_rect),
+                                  &current_paint_);
+}
+
+void SoftwareRenderer::DrawRenderPassQuad(const DrawingFrame* frame,
+                                          const RenderPassDrawQuad* quad) {
+  ScopedResource* content_texture =
+      render_pass_textures_.get(quad->render_pass_id);
+  if (!content_texture || !content_texture->id())
+    return;
+
+  DCHECK(IsSoftwareResource(content_texture->id()));
+  ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
+                                                content_texture->id());
+  if (!lock.valid())
+    return;
+  SkShader::TileMode content_tile_mode = WrapModeToTileMode(lock.wrap_mode());
+
+  SkRect dest_rect = gfx::RectFToSkRect(QuadVertexRect());
+  SkRect dest_visible_rect = gfx::RectFToSkRect(MathUtil::ScaleRectProportional(
+      QuadVertexRect(), quad->rect, quad->visible_rect));
+  SkRect content_rect = SkRect::MakeWH(quad->rect.width(), quad->rect.height());
+
+  SkMatrix content_mat;
+  content_mat.setRectToRect(content_rect, dest_rect,
+                            SkMatrix::kFill_ScaleToFit);
+
+  const SkBitmap* content = lock.sk_bitmap();
+
+  SkBitmap filter_bitmap;
+  if (!quad->filters.IsEmpty()) {
+    skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
+        quad->filters, content_texture->size());
+    // TODO(ajuma): Apply the filter in the same pass as the content where
+    // possible (e.g. when there's no origin offset). See crbug.com/308201.
+    if (filter) {
+      SkImageInfo info = SkImageInfo::MakeN32Premul(
+          content_texture->size().width(), content_texture->size().height());
+      if (filter_bitmap.tryAllocPixels(info)) {
+        SkCanvas canvas(filter_bitmap);
+        SkPaint paint;
+        paint.setImageFilter(filter.get());
+        canvas.clear(SK_ColorTRANSPARENT);
+        canvas.translate(SkIntToScalar(-quad->rect.origin().x()),
+                         SkIntToScalar(-quad->rect.origin().y()));
+        canvas.scale(quad->filters_scale.x(), quad->filters_scale.y());
+        canvas.drawSprite(*content, 0, 0, &paint);
+      }
+    }
+  }
+
+  skia::RefPtr<SkShader> shader;
+  if (filter_bitmap.isNull()) {
+    shader = skia::AdoptRef(SkShader::CreateBitmapShader(
+        *content, content_tile_mode, content_tile_mode, &content_mat));
+  } else {
+    shader = skia::AdoptRef(SkShader::CreateBitmapShader(
+        filter_bitmap, content_tile_mode, content_tile_mode, &content_mat));
+  }
+  current_paint_.setShader(shader.get());
+
+  if (quad->mask_resource_id) {
+    ResourceProvider::ScopedReadLockSoftware mask_lock(resource_provider_,
+                                                       quad->mask_resource_id);
+    if (!lock.valid())
+      return;
+    SkShader::TileMode mask_tile_mode = WrapModeToTileMode(
+        mask_lock.wrap_mode());
+
+    const SkBitmap* mask = mask_lock.sk_bitmap();
+
+    // Scale normalized uv rect into absolute texel coordinates.
+    SkRect mask_rect =
+        gfx::RectFToSkRect(gfx::ScaleRect(quad->MaskUVRect(),
+                                          quad->mask_texture_size.width(),
+                                          quad->mask_texture_size.height()));
+
+    SkMatrix mask_mat;
+    mask_mat.setRectToRect(mask_rect, dest_rect, SkMatrix::kFill_ScaleToFit);
+
+    skia::RefPtr<SkShader> mask_shader =
+        skia::AdoptRef(SkShader::CreateBitmapShader(
+            *mask, mask_tile_mode, mask_tile_mode, &mask_mat));
+
+    SkPaint mask_paint;
+    mask_paint.setShader(mask_shader.get());
+
+    SkLayerRasterizer::Builder builder;
+    builder.addLayer(mask_paint);
+
+    skia::RefPtr<SkLayerRasterizer> mask_rasterizer =
+        skia::AdoptRef(builder.detachRasterizer());
+
+    current_paint_.setRasterizer(mask_rasterizer.get());
+    current_canvas_->drawRect(dest_visible_rect, current_paint_);
+  } else {
+    // TODO(skaslev): Apply background filters
+    current_canvas_->drawRect(dest_visible_rect, current_paint_);
+  }
+}
+
+void SoftwareRenderer::DrawUnsupportedQuad(const DrawingFrame* frame,
+                                           const DrawQuad* quad) {
+#ifdef NDEBUG
+  current_paint_.setColor(SK_ColorWHITE);
+#else
+  current_paint_.setColor(SK_ColorMAGENTA);
+#endif
+  current_paint_.setAlpha(quad->opacity() * 255);
+  current_canvas_->drawRect(gfx::RectFToSkRect(QuadVertexRect()),
+                            current_paint_);
+}
+
+void SoftwareRenderer::CopyCurrentRenderPassToBitmap(
+    DrawingFrame* frame,
+    scoped_ptr<CopyOutputRequest> request) {
+  gfx::Rect copy_rect = frame->current_render_pass->output_rect;
+  if (request->has_area())
+    copy_rect.Intersect(request->area());
+  gfx::Rect window_copy_rect = MoveFromDrawToWindowSpace(frame, copy_rect);
+
+  scoped_ptr<SkBitmap> bitmap(new SkBitmap);
+  bitmap->setInfo(SkImageInfo::MakeN32Premul(window_copy_rect.width(),
+                                             window_copy_rect.height()));
+  current_canvas_->readPixels(
+      bitmap.get(), window_copy_rect.x(), window_copy_rect.y());
+
+  request->SendBitmapResult(bitmap.Pass());
+}
+
+void SoftwareRenderer::DiscardBackbuffer() {
+  if (is_backbuffer_discarded_)
+    return;
+
+  output_surface_->DiscardBackbuffer();
+
+  is_backbuffer_discarded_ = true;
+
+  // Damage tracker needs a full reset every time framebuffer is discarded.
+  client_->SetFullRootLayerDamage();
+}
+
+void SoftwareRenderer::EnsureBackbuffer() {
+  if (!is_backbuffer_discarded_)
+    return;
+
+  output_surface_->EnsureBackbuffer();
+  is_backbuffer_discarded_ = false;
+}
+
+void SoftwareRenderer::DidChangeVisibility() {
+  if (visible())
+    EnsureBackbuffer();
+  else
+    DiscardBackbuffer();
+}
+
+}  // namespace cc