cc/output/software_renderer.cc

   1 // Copyright 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "cc/output/software_renderer.h"
   6
   7 #include "base/debug/trace_event.h"
   8 #include "cc/base/math_util.h"
   9 #include "cc/output/compositor_frame.h"
  10 #include "cc/output/compositor_frame_ack.h"
  11 #include "cc/output/compositor_frame_metadata.h"
  12 #include "cc/output/copy_output_request.h"
  13 #include "cc/output/output_surface.h"
  14 #include "cc/output/render_surface_filters.h"
  15 #include "cc/output/software_output_device.h"
  16 #include "cc/quads/checkerboard_draw_quad.h"
  17 #include "cc/quads/debug_border_draw_quad.h"
  18 #include "cc/quads/picture_draw_quad.h"
  19 #include "cc/quads/render_pass_draw_quad.h"
  20 #include "cc/quads/solid_color_draw_quad.h"
  21 #include "cc/quads/texture_draw_quad.h"
  22 #include "cc/quads/tile_draw_quad.h"
  23 #include "skia/ext/opacity_draw_filter.h"
  24 #include "third_party/skia/include/core/SkCanvas.h"
  25 #include "third_party/skia/include/core/SkColor.h"
  26 #include "third_party/skia/include/core/SkImageFilter.h"
  27 #include "third_party/skia/include/core/SkMatrix.h"
  28 #include "third_party/skia/include/core/SkShader.h"
  29 #include "third_party/skia/include/effects/SkLayerRasterizer.h"
  30 #include "ui/gfx/geometry/rect_conversions.h"
  31 #include "ui/gfx/skia_util.h"
  32 #include "ui/gfx/transform.h"
  33
  34 namespace cc {
  35 namespace {
  36
  37 static inline bool IsScalarNearlyInteger(SkScalar scalar) {
  38   return SkScalarNearlyZero(scalar - SkScalarRoundToScalar(scalar));
  39 }
  40
  41 bool IsScaleAndIntegerTranslate(const SkMatrix& matrix) {
  42   return IsScalarNearlyInteger(matrix[SkMatrix::kMTransX]) &&
  43          IsScalarNearlyInteger(matrix[SkMatrix::kMTransY]) &&
  44          SkScalarNearlyZero(matrix[SkMatrix::kMSkewX]) &&
  45          SkScalarNearlyZero(matrix[SkMatrix::kMSkewY]) &&
  46          SkScalarNearlyZero(matrix[SkMatrix::kMPersp0]) &&
  47          SkScalarNearlyZero(matrix[SkMatrix::kMPersp1]) &&
  48          SkScalarNearlyZero(matrix[SkMatrix::kMPersp2] - 1.0f);
  49 }
  50
  51 static SkShader::TileMode WrapModeToTileMode(GLint wrap_mode) {
  52   switch (wrap_mode) {
  53     case GL_REPEAT:
  54       return SkShader::kRepeat_TileMode;
  55     case GL_CLAMP_TO_EDGE:
  56       return SkShader::kClamp_TileMode;
  57   }
  58   NOTREACHED();
  59   return SkShader::kClamp_TileMode;
  60 }
  61
  62 }  // anonymous namespace
  63
  64 scoped_ptr<SoftwareRenderer> SoftwareRenderer::Create(
  65     RendererClient* client,
  66     const LayerTreeSettings* settings,
  67     OutputSurface* output_surface,
  68     ResourceProvider* resource_provider) {
  69   return make_scoped_ptr(new SoftwareRenderer(
  70       client, settings, output_surface, resource_provider));
  71 }
  72
  73 SoftwareRenderer::SoftwareRenderer(RendererClient* client,
  74                                    const LayerTreeSettings* settings,
  75                                    OutputSurface* output_surface,
  76                                    ResourceProvider* resource_provider)
  77     : DirectRenderer(client, settings, output_surface, resource_provider),
  78       is_scissor_enabled_(false),
  79       is_backbuffer_discarded_(false),
  80       output_device_(output_surface->software_device()),
  81       current_canvas_(NULL) {
  82   if (resource_provider_) {
  83     capabilities_.max_texture_size = resource_provider_->max_texture_size();
  84     capabilities_.best_texture_format =
  85         resource_provider_->best_texture_format();
  86   }
  87   // The updater can access bitmaps while the SoftwareRenderer is using them.
  88   capabilities_.allow_partial_texture_updates = true;
  89   capabilities_.using_partial_swap = true;
  90
  91   capabilities_.using_shared_memory_resources = true;
  92
  93   capabilities_.allow_rasterize_on_demand = true;
  94 }
  95
  96 SoftwareRenderer::~SoftwareRenderer() {}
  97
  98 const RendererCapabilitiesImpl& SoftwareRenderer::Capabilities() const {
  99   return capabilities_;
 100 }
 101
 102 void SoftwareRenderer::BeginDrawingFrame(DrawingFrame* frame) {
 103   TRACE_EVENT0("cc", "SoftwareRenderer::BeginDrawingFrame");
 104   root_canvas_ = output_device_->BeginPaint(
 105       gfx::ToEnclosingRect(frame->root_damage_rect));
 106 }
 107
 108 void SoftwareRenderer::FinishDrawingFrame(DrawingFrame* frame) {
 109   TRACE_EVENT0("cc", "SoftwareRenderer::FinishDrawingFrame");
 110   current_framebuffer_lock_ = nullptr;
 111   current_canvas_ = NULL;
 112   root_canvas_ = NULL;
 113
 114   current_frame_data_.reset(new SoftwareFrameData);
 115   output_device_->EndPaint(current_frame_data_.get());
 116 }
 117
 118 void SoftwareRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
 119   TRACE_EVENT0("cc,benchmark", "SoftwareRenderer::SwapBuffers");
 120   CompositorFrame compositor_frame;
 121   compositor_frame.metadata = metadata;
 122   compositor_frame.software_frame_data = current_frame_data_.Pass();
 123   output_surface_->SwapBuffers(&compositor_frame);
 124 }
 125
 126 void SoftwareRenderer::ReceiveSwapBuffersAck(const CompositorFrameAck& ack) {
 127   output_device_->ReclaimSoftwareFrame(ack.last_software_frame_id);
 128 }
 129
 130 bool SoftwareRenderer::FlippedFramebuffer(const DrawingFrame* frame) const {
 131   return false;
 132 }
 133
 134 void SoftwareRenderer::EnsureScissorTestEnabled() {
 135   is_scissor_enabled_ = true;
 136   SetClipRect(scissor_rect_);
 137 }
 138
 139 void SoftwareRenderer::EnsureScissorTestDisabled() {
 140   // There is no explicit notion of enabling/disabling scissoring in software
 141   // rendering, but the underlying effect we want is to clear any existing
 142   // clipRect on the current SkCanvas. This is done by setting clipRect to
 143   // the viewport's dimensions.
 144   is_scissor_enabled_ = false;
 145   SkISize size = current_canvas_->getDeviceSize();
 146   SetClipRect(gfx::Rect(size.width(), size.height()));
 147 }
 148
 149 void SoftwareRenderer::Finish() {}
 150
 151 void SoftwareRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
 152   DCHECK(!output_surface_->HasExternalStencilTest());
 153   current_framebuffer_lock_ = nullptr;
 154   current_canvas_ = root_canvas_;
 155 }
 156
 157 bool SoftwareRenderer::BindFramebufferToTexture(
 158     DrawingFrame* frame,
 159     const ScopedResource* texture,
 160     const gfx::Rect& target_rect) {
 161   current_framebuffer_lock_ = make_scoped_ptr(
 162       new ResourceProvider::ScopedWriteLockSoftware(
 163           resource_provider_, texture->id()));
 164   current_canvas_ = current_framebuffer_lock_->sk_canvas();
 165   InitializeViewport(frame,
 166                      target_rect,
 167                      gfx::Rect(target_rect.size()),
 168                      target_rect.size());
 169   return true;
 170 }
 171
 172 void SoftwareRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
 173   is_scissor_enabled_ = true;
 174   scissor_rect_ = scissor_rect;
 175   SetClipRect(scissor_rect);
 176 }
 177
 178 void SoftwareRenderer::SetClipRect(const gfx::Rect& rect) {
 179   // Skia applies the current matrix to clip rects so we reset it temporary.
 180   SkMatrix current_matrix = current_canvas_->getTotalMatrix();
 181   current_canvas_->resetMatrix();
 182   current_canvas_->clipRect(gfx::RectToSkRect(rect), SkRegion::kReplace_Op);
 183   current_canvas_->setMatrix(current_matrix);
 184 }
 185
 186 void SoftwareRenderer::ClearCanvas(SkColor color) {
 187   // SkCanvas::clear doesn't respect the current clipping region
 188   // so we SkCanvas::drawColor instead if scissoring is active.
 189   if (is_scissor_enabled_)
 190     current_canvas_->drawColor(color, SkXfermode::kSrc_Mode);
 191   else
 192     current_canvas_->clear(color);
 193 }
 194
 195 void SoftwareRenderer::DiscardPixels(bool has_external_stencil_test,
 196                                      bool draw_rect_covers_full_surface) {}
 197
 198 void SoftwareRenderer::ClearFramebuffer(DrawingFrame* frame,
 199                                         bool has_external_stencil_test) {
 200   if (frame->current_render_pass->has_transparent_background) {
 201     ClearCanvas(SkColorSetARGB(0, 0, 0, 0));
 202   } else {
 203 #ifndef NDEBUG
 204     // On DEBUG builds, opaque render passes are cleared to blue
 205     // to easily see regions that were not drawn on the screen.
 206     ClearCanvas(SkColorSetARGB(255, 0, 0, 255));
 207 #endif
 208   }
 209 }
 210
 211 void SoftwareRenderer::SetDrawViewport(
 212     const gfx::Rect& window_space_viewport) {}
 213
 214 bool SoftwareRenderer::IsSoftwareResource(
 215     ResourceProvider::ResourceId resource_id) const {
 216   switch (resource_provider_->GetResourceType(resource_id)) {
 217     case ResourceProvider::GLTexture:
 218       return false;
 219     case ResourceProvider::Bitmap:
 220       return true;
 221     case ResourceProvider::InvalidType:
 222       break;
 223   }
 224
 225   LOG(FATAL) << "Invalid resource type.";
 226   return false;
 227 }
 228
 229 void SoftwareRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
 230   TRACE_EVENT0("cc", "SoftwareRenderer::DoDrawQuad");
 231   gfx::Transform quad_rect_matrix;
 232   QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
 233   gfx::Transform contents_device_transform =
 234       frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
 235   contents_device_transform.FlattenTo2d();
 236   SkMatrix sk_device_matrix;
 237   gfx::TransformToFlattenedSkMatrix(contents_device_transform,
 238                                     &sk_device_matrix);
 239   current_canvas_->setMatrix(sk_device_matrix);
 240
 241   current_paint_.reset();
 242   if (settings_->force_antialiasing ||
 243       !IsScaleAndIntegerTranslate(sk_device_matrix)) {
 244     // TODO(danakj): Until we can enable AA only on exterior edges of the
 245     // layer, disable AA if any interior edges are present. crbug.com/248175
 246     bool all_four_edges_are_exterior = quad->IsTopEdge() &&
 247                                        quad->IsLeftEdge() &&
 248                                        quad->IsBottomEdge() &&
 249                                        quad->IsRightEdge();
 250     if (settings_->allow_antialiasing &&
 251         (settings_->force_antialiasing || all_four_edges_are_exterior))
 252       current_paint_.setAntiAlias(true);
 253     current_paint_.setFilterLevel(SkPaint::kLow_FilterLevel);
 254   }
 255
 256   if (quad->ShouldDrawWithBlending() ||
 257       quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode) {
 258     current_paint_.setAlpha(quad->opacity() * 255);
 259     current_paint_.setXfermodeMode(quad->shared_quad_state->blend_mode);
 260   } else {
 261     current_paint_.setXfermodeMode(SkXfermode::kSrc_Mode);
 262   }
 263
 264   switch (quad->material) {
 265     case DrawQuad::CHECKERBOARD:
 266       DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad));
 267       break;
 268     case DrawQuad::DEBUG_BORDER:
 269       DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
 270       break;
 271     case DrawQuad::PICTURE_CONTENT:
 272       DrawPictureQuad(frame, PictureDrawQuad::MaterialCast(quad));
 273       break;
 274     case DrawQuad::RENDER_PASS:
 275       DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad));
 276       break;
 277     case DrawQuad::SOLID_COLOR:
 278       DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad));
 279       break;
 280     case DrawQuad::TEXTURE_CONTENT:
 281       DrawTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
 282       break;
 283     case DrawQuad::TILED_CONTENT:
 284       DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad));
 285       break;
 286     case DrawQuad::SURFACE_CONTENT:
 287       // Surface content should be fully resolved to other quad types before
 288       // reaching a direct renderer.
 289       NOTREACHED();
 290       break;
 291     case DrawQuad::INVALID:
 292     case DrawQuad::IO_SURFACE_CONTENT:
 293     case DrawQuad::YUV_VIDEO_CONTENT:
 294     case DrawQuad::STREAM_VIDEO_CONTENT:
 295       DrawUnsupportedQuad(frame, quad);
 296       NOTREACHED();
 297       break;
 298   }
 299
 300   current_canvas_->resetMatrix();
 301 }
 302
 303 void SoftwareRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
 304                                             const CheckerboardDrawQuad* quad) {
 305   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 306       QuadVertexRect(), quad->rect, quad->visible_rect);
 307   current_paint_.setColor(quad->color);
 308   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 309   current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
 310                             current_paint_);
 311 }
 312
 313 void SoftwareRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
 314                                            const DebugBorderDrawQuad* quad) {
 315   // We need to apply the matrix manually to have pixel-sized stroke width.
 316   SkPoint vertices[4];
 317   gfx::RectFToSkRect(QuadVertexRect()).toQuad(vertices);
 318   SkPoint transformed_vertices[4];
 319   current_canvas_->getTotalMatrix().mapPoints(transformed_vertices,
 320                                               vertices,
 321                                               4);
 322   current_canvas_->resetMatrix();
 323
 324   current_paint_.setColor(quad->color);
 325   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 326   current_paint_.setStyle(SkPaint::kStroke_Style);
 327   current_paint_.setStrokeWidth(quad->width);
 328   current_canvas_->drawPoints(SkCanvas::kPolygon_PointMode,
 329                               4, transformed_vertices, current_paint_);
 330 }
 331
 332 void SoftwareRenderer::DrawPictureQuad(const DrawingFrame* frame,
 333                                        const PictureDrawQuad* quad) {
 334   SkMatrix content_matrix;
 335   content_matrix.setRectToRect(
 336       gfx::RectFToSkRect(quad->tex_coord_rect),
 337       gfx::RectFToSkRect(QuadVertexRect()),
 338       SkMatrix::kFill_ScaleToFit);
 339   current_canvas_->concat(content_matrix);
 340
 341   // TODO(aelias): This isn't correct in all cases. We should detect these
 342   // cases and fall back to a persistent bitmap backing
 343   // (http://crbug.com/280374).
 344   skia::RefPtr<SkDrawFilter> opacity_filter =
 345       skia::AdoptRef(new skia::OpacityDrawFilter(
 346           quad->opacity(), frame->disable_picture_quad_image_filtering));
 347   DCHECK(!current_canvas_->getDrawFilter());
 348   current_canvas_->setDrawFilter(opacity_filter.get());
 349
 350   TRACE_EVENT0("cc",
 351                "SoftwareRenderer::DrawPictureQuad");
 352
 353   quad->raster_source->PlaybackToSharedCanvas(
 354       current_canvas_, quad->content_rect, quad->contents_scale);
 355
 356   current_canvas_->setDrawFilter(NULL);
 357 }
 358
 359 void SoftwareRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
 360                                           const SolidColorDrawQuad* quad) {
 361   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 362       QuadVertexRect(), quad->rect, quad->visible_rect);
 363   current_paint_.setColor(quad->color);
 364   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 365   current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
 366                             current_paint_);
 367 }
 368
 369 void SoftwareRenderer::DrawTextureQuad(const DrawingFrame* frame,
 370                                        const TextureDrawQuad* quad) {
 371   if (!IsSoftwareResource(quad->resource_id)) {
 372     DrawUnsupportedQuad(frame, quad);
 373     return;
 374   }
 375
 376   // TODO(skaslev): Add support for non-premultiplied alpha.
 377   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 378                                                 quad->resource_id);
 379   if (!lock.valid())
 380     return;
 381   const SkBitmap* bitmap = lock.sk_bitmap();
 382   gfx::RectF uv_rect = gfx::ScaleRect(gfx::BoundingRect(quad->uv_top_left,
 383                                                         quad->uv_bottom_right),
 384                                       bitmap->width(),
 385                                       bitmap->height());
 386   gfx::RectF visible_uv_rect =
 387       MathUtil::ScaleRectProportional(uv_rect, quad->rect, quad->visible_rect);
 388   SkRect sk_uv_rect = gfx::RectFToSkRect(visible_uv_rect);
 389   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 390       QuadVertexRect(), quad->rect, quad->visible_rect);
 391   SkRect quad_rect = gfx::RectFToSkRect(visible_quad_vertex_rect);
 392
 393   if (quad->flipped)
 394     current_canvas_->scale(1, -1);
 395
 396   bool blend_background = quad->background_color != SK_ColorTRANSPARENT &&
 397                           !bitmap->isOpaque();
 398   bool needs_layer = blend_background && (current_paint_.getAlpha() != 0xFF);
 399   if (needs_layer) {
 400     current_canvas_->saveLayerAlpha(&quad_rect, current_paint_.getAlpha());
 401     current_paint_.setAlpha(0xFF);
 402   }
 403   if (blend_background) {
 404     SkPaint background_paint;
 405     background_paint.setColor(quad->background_color);
 406     current_canvas_->drawRect(quad_rect, background_paint);
 407   }
 408   SkShader::TileMode tile_mode = WrapModeToTileMode(lock.wrap_mode());
 409   if (tile_mode != SkShader::kClamp_TileMode) {
 410     SkMatrix matrix;
 411     matrix.setRectToRect(sk_uv_rect, quad_rect, SkMatrix::kFill_ScaleToFit);
 412     skia::RefPtr<SkShader> shader = skia::AdoptRef(
 413         SkShader::CreateBitmapShader(*bitmap, tile_mode, tile_mode, &matrix));
 414     SkPaint paint;
 415     paint.setStyle(SkPaint::kFill_Style);
 416     paint.setShader(shader.get());
 417     current_canvas_->drawRect(quad_rect, paint);
 418   } else {
 419     current_canvas_->drawBitmapRectToRect(*bitmap,
 420                                           &sk_uv_rect,
 421                                           quad_rect,
 422                                           &current_paint_);
 423   }
 424
 425   if (needs_layer)
 426     current_canvas_->restore();
 427 }
 428
 429 void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
 430                                     const TileDrawQuad* quad) {
 431   // |resource_provider_| can be NULL in resourceless software draws, which
 432   // should never produce tile quads in the first place.
 433   DCHECK(resource_provider_);
 434   DCHECK(IsSoftwareResource(quad->resource_id));
 435
 436   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 437                                                 quad->resource_id);
 438   if (!lock.valid())
 439     return;
 440   DCHECK_EQ(GL_CLAMP_TO_EDGE, lock.wrap_mode());
 441
 442   gfx::RectF visible_tex_coord_rect = MathUtil::ScaleRectProportional(
 443       quad->tex_coord_rect, quad->rect, quad->visible_rect);
 444   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 445       QuadVertexRect(), quad->rect, quad->visible_rect);
 446
 447   SkRect uv_rect = gfx::RectFToSkRect(visible_tex_coord_rect);
 448   current_paint_.setFilterLevel(SkPaint::kLow_FilterLevel);
 449   current_canvas_->drawBitmapRectToRect(
 450       *lock.sk_bitmap(),
 451       &uv_rect,
 452       gfx::RectFToSkRect(visible_quad_vertex_rect),
 453       &current_paint_);
 454 }
 455
 456 void SoftwareRenderer::DrawRenderPassQuad(const DrawingFrame* frame,
 457                                           const RenderPassDrawQuad* quad) {
 458   ScopedResource* content_texture =
 459       render_pass_textures_.get(quad->render_pass_id);
 460   if (!content_texture || !content_texture->id())
 461     return;
 462
 463   DCHECK(IsSoftwareResource(content_texture->id()));
 464   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 465                                                 content_texture->id());
 466   if (!lock.valid())
 467     return;
 468   SkShader::TileMode content_tile_mode = WrapModeToTileMode(lock.wrap_mode());
 469
 470   SkRect dest_rect = gfx::RectFToSkRect(QuadVertexRect());
 471   SkRect dest_visible_rect = gfx::RectFToSkRect(MathUtil::ScaleRectProportional(
 472       QuadVertexRect(), quad->rect, quad->visible_rect));
 473   SkRect content_rect = SkRect::MakeWH(quad->rect.width(), quad->rect.height());
 474
 475   SkMatrix content_mat;
 476   content_mat.setRectToRect(content_rect, dest_rect,
 477                             SkMatrix::kFill_ScaleToFit);
 478
 479   const SkBitmap* content = lock.sk_bitmap();
 480
 481   SkBitmap filter_bitmap;
 482   if (!quad->filters.IsEmpty()) {
 483     skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
 484         quad->filters, content_texture->size());
 485     // TODO(ajuma): Apply the filter in the same pass as the content where
 486     // possible (e.g. when there's no origin offset). See crbug.com/308201.
 487     if (filter) {
 488       SkImageInfo info = SkImageInfo::MakeN32Premul(
 489           content_texture->size().width(), content_texture->size().height());
 490       if (filter_bitmap.tryAllocPixels(info)) {
 491         SkCanvas canvas(filter_bitmap);
 492         SkPaint paint;
 493         paint.setImageFilter(filter.get());
 494         canvas.clear(SK_ColorTRANSPARENT);
 495         canvas.translate(SkIntToScalar(-quad->rect.origin().x()),
 496                          SkIntToScalar(-quad->rect.origin().y()));
 497         canvas.scale(quad->filters_scale.x(), quad->filters_scale.y());
 498         canvas.drawSprite(*content, 0, 0, &paint);
 499       }
 500     }
 501   }
 502
 503   skia::RefPtr<SkShader> shader;
 504   if (filter_bitmap.isNull()) {
 505     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 506         *content, content_tile_mode, content_tile_mode, &content_mat));
 507   } else {
 508     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 509         filter_bitmap, content_tile_mode, content_tile_mode, &content_mat));
 510   }
 511   current_paint_.setShader(shader.get());
 512
 513   if (quad->mask_resource_id) {
 514     ResourceProvider::ScopedReadLockSoftware mask_lock(resource_provider_,
 515                                                        quad->mask_resource_id);
 516     if (!lock.valid())
 517       return;
 518     SkShader::TileMode mask_tile_mode = WrapModeToTileMode(
 519         mask_lock.wrap_mode());
 520
 521     const SkBitmap* mask = mask_lock.sk_bitmap();
 522
 523     // Scale normalized uv rect into absolute texel coordinates.
 524     SkRect mask_rect =
 525         gfx::RectFToSkRect(gfx::ScaleRect(quad->MaskUVRect(),
 526                                           quad->mask_texture_size.width(),
 527                                           quad->mask_texture_size.height()));
 528
 529     SkMatrix mask_mat;
 530     mask_mat.setRectToRect(mask_rect, dest_rect, SkMatrix::kFill_ScaleToFit);
 531
 532     skia::RefPtr<SkShader> mask_shader =
 533         skia::AdoptRef(SkShader::CreateBitmapShader(
 534             *mask, mask_tile_mode, mask_tile_mode, &mask_mat));
 535
 536     SkPaint mask_paint;
 537     mask_paint.setShader(mask_shader.get());
 538
 539     SkLayerRasterizer::Builder builder;
 540     builder.addLayer(mask_paint);
 541
 542     skia::RefPtr<SkLayerRasterizer> mask_rasterizer =
 543         skia::AdoptRef(builder.detachRasterizer());
 544
 545     current_paint_.setRasterizer(mask_rasterizer.get());
 546     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 547   } else {
 548     // TODO(skaslev): Apply background filters
 549     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 550   }
 551 }
 552
 553 void SoftwareRenderer::DrawUnsupportedQuad(const DrawingFrame* frame,
 554                                            const DrawQuad* quad) {
 555 #ifdef NDEBUG
 556   current_paint_.setColor(SK_ColorWHITE);
 557 #else
 558   current_paint_.setColor(SK_ColorMAGENTA);
 559 #endif
 560   current_paint_.setAlpha(quad->opacity() * 255);
 561   current_canvas_->drawRect(gfx::RectFToSkRect(QuadVertexRect()),
 562                             current_paint_);
 563 }
 564
 565 void SoftwareRenderer::CopyCurrentRenderPassToBitmap(
 566     DrawingFrame* frame,
 567     scoped_ptr<CopyOutputRequest> request) {
 568   gfx::Rect copy_rect = frame->current_render_pass->output_rect;
 569   if (request->has_area())
 570     copy_rect.Intersect(request->area());
 571   gfx::Rect window_copy_rect = MoveFromDrawToWindowSpace(frame, copy_rect);
 572
 573   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
 574   bitmap->setInfo(SkImageInfo::MakeN32Premul(window_copy_rect.width(),
 575                                              window_copy_rect.height()));
 576   current_canvas_->readPixels(
 577       bitmap.get(), window_copy_rect.x(), window_copy_rect.y());
 578
 579   request->SendBitmapResult(bitmap.Pass());
 580 }
 581
 582 void SoftwareRenderer::DiscardBackbuffer() {
 583   if (is_backbuffer_discarded_)
 584     return;
 585
 586   output_surface_->DiscardBackbuffer();
 587
 588   is_backbuffer_discarded_ = true;
 589
 590   // Damage tracker needs a full reset every time framebuffer is discarded.
 591   client_->SetFullRootLayerDamage();
 592 }
 593
 594 void SoftwareRenderer::EnsureBackbuffer() {
 595   if (!is_backbuffer_discarded_)
 596     return;
 597
 598   output_surface_->EnsureBackbuffer();
 599   is_backbuffer_discarded_ = false;
 600 }
 601
 602 void SoftwareRenderer::DidChangeVisibility() {
 603   if (visible())
 604     EnsureBackbuffer();
 605   else
 606     DiscardBackbuffer();
 607 }
 608
 609 }  // namespace cc