cc/output/software

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This source file includes following definitions.
contents_scale_
RunOnWorkerThread
IsScalarNearlyInteger
IsScaleAndIntegerTranslate
WrapModeToTileMode
Create
current_canvas_
BeginDrawingFrame
FinishDrawingFrame
SwapBuffers
ReceiveSwapBuffersAck
FlippedFramebuffer
EnsureScissorTestEnabled
EnsureScissorTestDisabled
Finish
BindFramebufferToOutputSurface
BindFramebufferToTexture
SetScissorTestRect
SetClipRect
ClearCanvas
DiscardPixels
ClearFramebuffer
SetDrawViewport
IsSoftwareResource
DoDrawQuad
DrawCheckerboardQuad
DrawDebugBorderQuad
DrawPictureQuad
DrawSolidColorQuad
DrawTextureQuad
DrawTileQuad
DrawRenderPassQuad
DrawUnsupportedQuad
CopyCurrentRenderPassToBitmap
DiscardBackbuffer
EnsureBackbuffer
GetFramebufferPixels
SetVisible
// 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/debug/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/picture_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 "cc/resources/raster_worker_pool.h"
#include "skia/ext/opacity_draw_filter.h"
#include "third_party/skia/include/core/SkBitmapDevice.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/SkShader.h"
#include "third_party/skia/include/effects/SkLayerRasterizer.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/skia_util.h"
#include "ui/gfx/transform.h"

namespace cc {

namespace {

class OnDemandRasterTaskImpl : public internal::Task {
 public:
  OnDemandRasterTaskImpl(PicturePileImpl* picture_pile,
                         SkCanvas* canvas,
                         gfx::Rect content_rect,
                         float contents_scale)
      : picture_pile_(picture_pile),
        canvas_(canvas),
        content_rect_(content_rect),
        contents_scale_(contents_scale) {
    DCHECK(picture_pile_);
    DCHECK(canvas_);
  }

  // Overridden from internal::Task:
  virtual void RunOnWorkerThread() OVERRIDE {
    TRACE_EVENT0("cc", "OnDemandRasterTaskImpl::RunOnWorkerThread");

    PicturePileImpl* picture_pile = picture_pile_->GetCloneForDrawingOnThread(
        RasterWorkerPool::GetPictureCloneIndexForCurrentThread());
    DCHECK(picture_pile);

    picture_pile->RasterDirect(canvas_, content_rect_, contents_scale_, NULL);
  }

 protected:
  virtual ~OnDemandRasterTaskImpl() {}

 private:
  PicturePileImpl* picture_pile_;
  SkCanvas* canvas_;
  const gfx::Rect content_rect_;
  const float contents_scale_;

  DISALLOW_COPY_AND_ASSIGN(OnDemandRasterTaskImpl);
};

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 LayerTreeSettings* settings,
    OutputSurface* output_surface,
    ResourceProvider* resource_provider) {
  return make_scoped_ptr(new SoftwareRenderer(
      client, settings, output_surface, resource_provider));
}

SoftwareRenderer::SoftwareRenderer(RendererClient* client,
                                   const LayerTreeSettings* settings,
                                   OutputSurface* output_surface,
                                   ResourceProvider* resource_provider)
    : DirectRenderer(client, settings, output_surface, resource_provider),
      visible_(true),
      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_map_image = settings_->use_map_image;
  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_.reset();
  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 {
  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_.reset();
  current_canvas_ = root_canvas_;
}

bool SoftwareRenderer::BindFramebufferToTexture(
    DrawingFrame* frame,
    const ScopedResource* texture,
    const gfx::Rect& target_rect) {
  current_framebuffer_lock_.reset();
  current_framebuffer_lock_ = make_scoped_ptr(
      new ResourceProvider::ScopedWriteLockSoftware(
          resource_provider_, texture->id()));
  current_canvas_ = current_framebuffer_lock_->sk_canvas();
  InitializeViewport(frame,
                     target_rect,
                     gfx::Rect(target_rect.size()),
                     target_rect.size());
  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::DiscardPixels(bool has_external_stencil_test,
                                     bool draw_rect_covers_full_surface) {}

void SoftwareRenderer::ClearFramebuffer(DrawingFrame* frame,
                                        bool has_external_stencil_test) {
  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::SetDrawViewport(
    const gfx::Rect& window_space_viewport) {}

bool SoftwareRenderer::IsSoftwareResource(
    ResourceProvider::ResourceId resource_id) const {
  switch (resource_provider_->GetResourceType(resource_id)) {
    case ResourceProvider::GLTexture:
      return false;
    case ResourceProvider::Bitmap:
      return true;
    case ResourceProvider::InvalidType:
      break;
  }

  LOG(FATAL) << "Invalid resource type.";
  return false;
}

void SoftwareRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
  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 (!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 && all_four_edges_are_exterior)
      current_paint_.setAntiAlias(true);
    current_paint_.setFilterBitmap(true);
  }

  if (quad->ShouldDrawWithBlending()) {
    current_paint_.setAlpha(quad->opacity() * 255);
    current_paint_.setXfermodeMode(SkXfermode::kSrcOver_Mode);
  } else {
    current_paint_.setXfermodeMode(SkXfermode::kSrc_Mode);
  }

  switch (quad->material) {
    case DrawQuad::CHECKERBOARD:
      DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad));
      break;
    case DrawQuad::DEBUG_BORDER:
      DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
      break;
    case DrawQuad::PICTURE_CONTENT:
      DrawPictureQuad(frame, PictureDrawQuad::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:
      DrawUnsupportedQuad(frame, quad);
      NOTREACHED();
      break;
  }

  current_canvas_->resetMatrix();
}

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() * SkColorGetA(quad->color));
  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::DrawPictureQuad(const DrawingFrame* frame,
                                       const PictureDrawQuad* quad) {
  SkMatrix content_matrix;
  content_matrix.setRectToRect(
      gfx::RectFToSkRect(quad->tex_coord_rect),
      gfx::RectFToSkRect(QuadVertexRect()),
      SkMatrix::kFill_ScaleToFit);
  current_canvas_->concat(content_matrix);

  // TODO(aelias): This isn't correct in all cases. We should detect these
  // cases and fall back to a persistent bitmap backing
  // (http://crbug.com/280374).
  skia::RefPtr<SkDrawFilter> opacity_filter =
      skia::AdoptRef(new skia::OpacityDrawFilter(
          quad->opacity(), frame->disable_picture_quad_image_filtering));
  DCHECK(!current_canvas_->getDrawFilter());
  current_canvas_->setDrawFilter(opacity_filter.get());

  TRACE_EVENT0("cc",
               "SoftwareRenderer::DrawPictureQuad");

  // Create and run on-demand raster task for tile.
  scoped_refptr<internal::Task> on_demand_raster_task(
      new OnDemandRasterTaskImpl(quad->picture_pile,
                                 current_canvas_,
                                 quad->content_rect,
                                 quad->contents_scale));
  RunOnDemandRasterTask(on_demand_raster_task.get());

  current_canvas_->setDrawFilter(NULL);
}

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));
    shader->setLocalMatrix(matrix);
    SkPaint paint;
    paint.setStyle(SkPaint::kFill_Style);
    paint.setShader(shader.get());
    current_canvas_->drawRect(quad_rect, paint);
  } else {
    current_canvas_->drawBitmapRectToRect(*bitmap,
                                          &sk_uv_rect,
                                          quad_rect,
                                          &current_paint_);
  }

  if (needs_layer)
    current_canvas_->restore();
}

void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
                                    const TileDrawQuad* quad) {
  DCHECK(!output_surface_->ForcedDrawToSoftwareDevice());
  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_.setFilterBitmap(true);
  current_canvas_->drawBitmapRectToRect(
      *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): In addition origin translation, the canvas should also be
    // scaled to accomodate device pixel ratio and pinch zoom. See
    // crbug.com/281516 and crbug.com/281518.
    // 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.allocPixels(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.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));
  } else {
    shader = skia::AdoptRef(SkShader::CreateBitmapShader(
        filter_bitmap, content_tile_mode, content_tile_mode));
  }
  shader->setLocalMatrix(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();

    SkRect mask_rect = SkRect::MakeXYWH(
        quad->mask_uv_rect.x() * mask->width(),
        quad->mask_uv_rect.y() * mask->height(),
        quad->mask_uv_rect.width() * mask->width(),
        quad->mask_uv_rect.height() * mask->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_shader->setLocalMatrix(mask_mat);

    SkPaint mask_paint;
    mask_paint.setShader(mask_shader.get());

    skia::RefPtr<SkLayerRasterizer> mask_rasterizer =
        skia::AdoptRef(new SkLayerRasterizer);
    mask_rasterizer->addLayer(mask_paint);

    current_paint_.setRasterizer(mask_rasterizer.get());
    current_canvas_->drawRect(dest_visible_rect, current_paint_);
  } else {
    // TODO(skaslev): Apply background filters and blend with content
    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(copy_rect);

  scoped_ptr<SkBitmap> bitmap(new SkBitmap);
  bitmap->setConfig(SkBitmap::kARGB_8888_Config,
                    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::GetFramebufferPixels(void* pixels,
                                            const gfx::Rect& rect) {
  TRACE_EVENT0("cc", "SoftwareRenderer::GetFramebufferPixels");
  gfx::Rect frame_rect(rect);
  frame_rect += current_viewport_rect_.OffsetFromOrigin();
  output_device_->CopyToPixels(frame_rect, pixels);
}

void SoftwareRenderer::SetVisible(bool visible) {
  if (visible_ == visible)
    return;
  visible_ = visible;

  if (visible_)
    EnsureBackbuffer();
  else
    DiscardBackbuffer();
}

}  // namespace cc
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root/cc/output/software_renderer.cc

DEFINITIONS
