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 RendererSettings* 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 RendererSettings* 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_framebuffer_canvas_.clear();
 112   current_canvas_ = NULL;
 113   root_canvas_ = NULL;
 114
 115   current_frame_data_.reset(new SoftwareFrameData);
 116   output_device_->EndPaint(current_frame_data_.get());
 117 }
 118
 119 void SoftwareRenderer::SwapBuffers(const CompositorFrameMetadata& metadata) {
 120   TRACE_EVENT0("cc,benchmark", "SoftwareRenderer::SwapBuffers");
 121   CompositorFrame compositor_frame;
 122   compositor_frame.metadata = metadata;
 123   compositor_frame.software_frame_data = current_frame_data_.Pass();
 124   output_surface_->SwapBuffers(&compositor_frame);
 125 }
 126
 127 void SoftwareRenderer::ReceiveSwapBuffersAck(const CompositorFrameAck& ack) {
 128   output_device_->ReclaimSoftwareFrame(ack.last_software_frame_id);
 129 }
 130
 131 bool SoftwareRenderer::FlippedFramebuffer(const DrawingFrame* frame) const {
 132   return false;
 133 }
 134
 135 void SoftwareRenderer::EnsureScissorTestEnabled() {
 136   is_scissor_enabled_ = true;
 137   SetClipRect(scissor_rect_);
 138 }
 139
 140 void SoftwareRenderer::EnsureScissorTestDisabled() {
 141   // There is no explicit notion of enabling/disabling scissoring in software
 142   // rendering, but the underlying effect we want is to clear any existing
 143   // clipRect on the current SkCanvas. This is done by setting clipRect to
 144   // the viewport's dimensions.
 145   is_scissor_enabled_ = false;
 146   SkISize size = current_canvas_->getDeviceSize();
 147   SetClipRect(gfx::Rect(size.width(), size.height()));
 148 }
 149
 150 void SoftwareRenderer::Finish() {}
 151
 152 void SoftwareRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
 153   DCHECK(!output_surface_->HasExternalStencilTest());
 154   current_framebuffer_lock_ = nullptr;
 155   current_framebuffer_canvas_.clear();
 156   current_canvas_ = root_canvas_;
 157 }
 158
 159 bool SoftwareRenderer::BindFramebufferToTexture(
 160     DrawingFrame* frame,
 161     const ScopedResource* texture,
 162     const gfx::Rect& target_rect) {
 163   current_framebuffer_lock_ = make_scoped_ptr(
 164       new ResourceProvider::ScopedWriteLockSoftware(
 165           resource_provider_, texture->id()));
 166   current_framebuffer_canvas_ =
 167       skia::AdoptRef(new SkCanvas(current_framebuffer_lock_->sk_bitmap()));
 168   current_canvas_ = current_framebuffer_canvas_.get();
 169   InitializeViewport(frame,
 170                      target_rect,
 171                      gfx::Rect(target_rect.size()),
 172                      target_rect.size());
 173   return true;
 174 }
 175
 176 void SoftwareRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
 177   is_scissor_enabled_ = true;
 178   scissor_rect_ = scissor_rect;
 179   SetClipRect(scissor_rect);
 180 }
 181
 182 void SoftwareRenderer::SetClipRect(const gfx::Rect& rect) {
 183   // Skia applies the current matrix to clip rects so we reset it temporary.
 184   SkMatrix current_matrix = current_canvas_->getTotalMatrix();
 185   current_canvas_->resetMatrix();
 186   current_canvas_->clipRect(gfx::RectToSkRect(rect), SkRegion::kReplace_Op);
 187   current_canvas_->setMatrix(current_matrix);
 188 }
 189
 190 void SoftwareRenderer::ClearCanvas(SkColor color) {
 191   // SkCanvas::clear doesn't respect the current clipping region
 192   // so we SkCanvas::drawColor instead if scissoring is active.
 193   if (is_scissor_enabled_)
 194     current_canvas_->drawColor(color, SkXfermode::kSrc_Mode);
 195   else
 196     current_canvas_->clear(color);
 197 }
 198
 199 void SoftwareRenderer::DiscardPixels(bool has_external_stencil_test,
 200                                      bool draw_rect_covers_full_surface) {}
 201
 202 void SoftwareRenderer::ClearFramebuffer(DrawingFrame* frame,
 203                                         bool has_external_stencil_test) {
 204   if (frame->current_render_pass->has_transparent_background) {
 205     ClearCanvas(SkColorSetARGB(0, 0, 0, 0));
 206   } else {
 207 #ifndef NDEBUG
 208     // On DEBUG builds, opaque render passes are cleared to blue
 209     // to easily see regions that were not drawn on the screen.
 210     ClearCanvas(SkColorSetARGB(255, 0, 0, 255));
 211 #endif
 212   }
 213 }
 214
 215 void SoftwareRenderer::SetDrawViewport(
 216     const gfx::Rect& window_space_viewport) {}
 217
 218 bool SoftwareRenderer::IsSoftwareResource(
 219     ResourceProvider::ResourceId resource_id) const {
 220   switch (resource_provider_->GetResourceType(resource_id)) {
 221     case ResourceProvider::GLTexture:
 222       return false;
 223     case ResourceProvider::Bitmap:
 224       return true;
 225     case ResourceProvider::InvalidType:
 226       break;
 227   }
 228
 229   LOG(FATAL) << "Invalid resource type.";
 230   return false;
 231 }
 232
 233 void SoftwareRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
 234   TRACE_EVENT0("cc", "SoftwareRenderer::DoDrawQuad");
 235   gfx::Transform quad_rect_matrix;
 236   QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
 237   gfx::Transform contents_device_transform =
 238       frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
 239   contents_device_transform.FlattenTo2d();
 240   SkMatrix sk_device_matrix;
 241   gfx::TransformToFlattenedSkMatrix(contents_device_transform,
 242                                     &sk_device_matrix);
 243   current_canvas_->setMatrix(sk_device_matrix);
 244
 245   current_paint_.reset();
 246   if (settings_->force_antialiasing ||
 247       !IsScaleAndIntegerTranslate(sk_device_matrix)) {
 248     // TODO(danakj): Until we can enable AA only on exterior edges of the
 249     // layer, disable AA if any interior edges are present. crbug.com/248175
 250     bool all_four_edges_are_exterior = quad->IsTopEdge() &&
 251                                        quad->IsLeftEdge() &&
 252                                        quad->IsBottomEdge() &&
 253                                        quad->IsRightEdge();
 254     if (settings_->allow_antialiasing &&
 255         (settings_->force_antialiasing || all_four_edges_are_exterior))
 256       current_paint_.setAntiAlias(true);
 257     current_paint_.setFilterLevel(SkPaint::kLow_FilterLevel);
 258   }
 259
 260   if (quad->ShouldDrawWithBlending() ||
 261       quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode) {
 262     current_paint_.setAlpha(quad->opacity() * 255);
 263     current_paint_.setXfermodeMode(quad->shared_quad_state->blend_mode);
 264   } else {
 265     current_paint_.setXfermodeMode(SkXfermode::kSrc_Mode);
 266   }
 267
 268   switch (quad->material) {
 269     case DrawQuad::CHECKERBOARD:
 270       DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad));
 271       break;
 272     case DrawQuad::DEBUG_BORDER:
 273       DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
 274       break;
 275     case DrawQuad::PICTURE_CONTENT:
 276       DrawPictureQuad(frame, PictureDrawQuad::MaterialCast(quad));
 277       break;
 278     case DrawQuad::RENDER_PASS:
 279       DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad));
 280       break;
 281     case DrawQuad::SOLID_COLOR:
 282       DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad));
 283       break;
 284     case DrawQuad::TEXTURE_CONTENT:
 285       DrawTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
 286       break;
 287     case DrawQuad::TILED_CONTENT:
 288       DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad));
 289       break;
 290     case DrawQuad::SURFACE_CONTENT:
 291       // Surface content should be fully resolved to other quad types before
 292       // reaching a direct renderer.
 293       NOTREACHED();
 294       break;
 295     case DrawQuad::INVALID:
 296     case DrawQuad::IO_SURFACE_CONTENT:
 297     case DrawQuad::YUV_VIDEO_CONTENT:
 298     case DrawQuad::STREAM_VIDEO_CONTENT:
 299       DrawUnsupportedQuad(frame, quad);
 300       NOTREACHED();
 301       break;
 302   }
 303
 304   current_canvas_->resetMatrix();
 305 }
 306
 307 void SoftwareRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
 308                                             const CheckerboardDrawQuad* quad) {
 309   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 310       QuadVertexRect(), quad->rect, quad->visible_rect);
 311   current_paint_.setColor(quad->color);
 312   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 313   current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
 314                             current_paint_);
 315 }
 316
 317 void SoftwareRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
 318                                            const DebugBorderDrawQuad* quad) {
 319   // We need to apply the matrix manually to have pixel-sized stroke width.
 320   SkPoint vertices[4];
 321   gfx::RectFToSkRect(QuadVertexRect()).toQuad(vertices);
 322   SkPoint transformed_vertices[4];
 323   current_canvas_->getTotalMatrix().mapPoints(transformed_vertices,
 324                                               vertices,
 325                                               4);
 326   current_canvas_->resetMatrix();
 327
 328   current_paint_.setColor(quad->color);
 329   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 330   current_paint_.setStyle(SkPaint::kStroke_Style);
 331   current_paint_.setStrokeWidth(quad->width);
 332   current_canvas_->drawPoints(SkCanvas::kPolygon_PointMode,
 333                               4, transformed_vertices, current_paint_);
 334 }
 335
 336 void SoftwareRenderer::DrawPictureQuad(const DrawingFrame* frame,
 337                                        const PictureDrawQuad* quad) {
 338   SkMatrix content_matrix;
 339   content_matrix.setRectToRect(
 340       gfx::RectFToSkRect(quad->tex_coord_rect),
 341       gfx::RectFToSkRect(QuadVertexRect()),
 342       SkMatrix::kFill_ScaleToFit);
 343   current_canvas_->concat(content_matrix);
 344
 345   // TODO(aelias): This isn't correct in all cases. We should detect these
 346   // cases and fall back to a persistent bitmap backing
 347   // (http://crbug.com/280374).
 348   skia::RefPtr<SkDrawFilter> opacity_filter =
 349       skia::AdoptRef(new skia::OpacityDrawFilter(
 350           quad->opacity(), frame->disable_picture_quad_image_filtering ||
 351                                quad->nearest_neighbor));
 352   DCHECK(!current_canvas_->getDrawFilter());
 353   current_canvas_->setDrawFilter(opacity_filter.get());
 354
 355   TRACE_EVENT0("cc",
 356                "SoftwareRenderer::DrawPictureQuad");
 357
 358   quad->raster_source->PlaybackToSharedCanvas(
 359       current_canvas_, quad->content_rect, quad->contents_scale);
 360
 361   current_canvas_->setDrawFilter(NULL);
 362 }
 363
 364 void SoftwareRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
 365                                           const SolidColorDrawQuad* quad) {
 366   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 367       QuadVertexRect(), quad->rect, quad->visible_rect);
 368   current_paint_.setColor(quad->color);
 369   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 370   current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
 371                             current_paint_);
 372 }
 373
 374 void SoftwareRenderer::DrawTextureQuad(const DrawingFrame* frame,
 375                                        const TextureDrawQuad* quad) {
 376   if (!IsSoftwareResource(quad->resource_id)) {
 377     DrawUnsupportedQuad(frame, quad);
 378     return;
 379   }
 380
 381   // TODO(skaslev): Add support for non-premultiplied alpha.
 382   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 383                                                 quad->resource_id);
 384   if (!lock.valid())
 385     return;
 386   const SkBitmap* bitmap = lock.sk_bitmap();
 387   gfx::RectF uv_rect = gfx::ScaleRect(gfx::BoundingRect(quad->uv_top_left,
 388                                                         quad->uv_bottom_right),
 389                                       bitmap->width(),
 390                                       bitmap->height());
 391   gfx::RectF visible_uv_rect =
 392       MathUtil::ScaleRectProportional(uv_rect, quad->rect, quad->visible_rect);
 393   SkRect sk_uv_rect = gfx::RectFToSkRect(visible_uv_rect);
 394   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 395       QuadVertexRect(), quad->rect, quad->visible_rect);
 396   SkRect quad_rect = gfx::RectFToSkRect(visible_quad_vertex_rect);
 397
 398   if (quad->flipped)
 399     current_canvas_->scale(1, -1);
 400
 401   bool blend_background = quad->background_color != SK_ColorTRANSPARENT &&
 402                           !bitmap->isOpaque();
 403   bool needs_layer = blend_background && (current_paint_.getAlpha() != 0xFF);
 404   if (needs_layer) {
 405     current_canvas_->saveLayerAlpha(&quad_rect, current_paint_.getAlpha());
 406     current_paint_.setAlpha(0xFF);
 407   }
 408   if (blend_background) {
 409     SkPaint background_paint;
 410     background_paint.setColor(quad->background_color);
 411     current_canvas_->drawRect(quad_rect, background_paint);
 412   }
 413   SkShader::TileMode tile_mode = WrapModeToTileMode(lock.wrap_mode());
 414   if (tile_mode != SkShader::kClamp_TileMode) {
 415     SkMatrix matrix;
 416     matrix.setRectToRect(sk_uv_rect, quad_rect, SkMatrix::kFill_ScaleToFit);
 417     skia::RefPtr<SkShader> shader = skia::AdoptRef(
 418         SkShader::CreateBitmapShader(*bitmap, tile_mode, tile_mode, &matrix));
 419     SkPaint paint;
 420     paint.setStyle(SkPaint::kFill_Style);
 421     paint.setShader(shader.get());
 422     current_canvas_->drawRect(quad_rect, paint);
 423   } else {
 424     current_canvas_->drawBitmapRectToRect(*bitmap,
 425                                           &sk_uv_rect,
 426                                           quad_rect,
 427                                           &current_paint_);
 428   }
 429
 430   if (needs_layer)
 431     current_canvas_->restore();
 432 }
 433
 434 void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
 435                                     const TileDrawQuad* quad) {
 436   // |resource_provider_| can be NULL in resourceless software draws, which
 437   // should never produce tile quads in the first place.
 438   DCHECK(resource_provider_);
 439   DCHECK(IsSoftwareResource(quad->resource_id));
 440
 441   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 442                                                 quad->resource_id);
 443   if (!lock.valid())
 444     return;
 445   DCHECK_EQ(GL_CLAMP_TO_EDGE, lock.wrap_mode());
 446
 447   gfx::RectF visible_tex_coord_rect = MathUtil::ScaleRectProportional(
 448       quad->tex_coord_rect, quad->rect, quad->visible_rect);
 449   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 450       QuadVertexRect(), quad->rect, quad->visible_rect);
 451
 452   SkRect uv_rect = gfx::RectFToSkRect(visible_tex_coord_rect);
 453   current_paint_.setFilterLevel(quad->nearest_neighbor
 454                                     ? SkPaint::kNone_FilterLevel
 455                                     : SkPaint::kLow_FilterLevel);
 456   current_canvas_->drawBitmapRectToRect(
 457       *lock.sk_bitmap(),
 458       &uv_rect,
 459       gfx::RectFToSkRect(visible_quad_vertex_rect),
 460       &current_paint_);
 461 }
 462
 463 void SoftwareRenderer::DrawRenderPassQuad(const DrawingFrame* frame,
 464                                           const RenderPassDrawQuad* quad) {
 465   ScopedResource* content_texture =
 466       render_pass_textures_.get(quad->render_pass_id);
 467   if (!content_texture || !content_texture->id())
 468     return;
 469
 470   DCHECK(IsSoftwareResource(content_texture->id()));
 471   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 472                                                 content_texture->id());
 473   if (!lock.valid())
 474     return;
 475   SkShader::TileMode content_tile_mode = WrapModeToTileMode(lock.wrap_mode());
 476
 477   SkRect dest_rect = gfx::RectFToSkRect(QuadVertexRect());
 478   SkRect dest_visible_rect = gfx::RectFToSkRect(MathUtil::ScaleRectProportional(
 479       QuadVertexRect(), quad->rect, quad->visible_rect));
 480   SkRect content_rect = SkRect::MakeWH(quad->rect.width(), quad->rect.height());
 481
 482   SkMatrix content_mat;
 483   content_mat.setRectToRect(content_rect, dest_rect,
 484                             SkMatrix::kFill_ScaleToFit);
 485
 486   const SkBitmap* content = lock.sk_bitmap();
 487
 488   SkBitmap filter_bitmap;
 489   if (!quad->filters.IsEmpty()) {
 490     skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
 491         quad->filters, content_texture->size());
 492     // TODO(ajuma): Apply the filter in the same pass as the content where
 493     // possible (e.g. when there's no origin offset). See crbug.com/308201.
 494     if (filter) {
 495       SkImageInfo info = SkImageInfo::MakeN32Premul(
 496           content_texture->size().width(), content_texture->size().height());
 497       if (filter_bitmap.tryAllocPixels(info)) {
 498         SkCanvas canvas(filter_bitmap);
 499         SkPaint paint;
 500         paint.setImageFilter(filter.get());
 501         canvas.clear(SK_ColorTRANSPARENT);
 502         canvas.translate(SkIntToScalar(-quad->rect.origin().x()),
 503                          SkIntToScalar(-quad->rect.origin().y()));
 504         canvas.scale(quad->filters_scale.x(), quad->filters_scale.y());
 505         canvas.drawSprite(*content, 0, 0, &paint);
 506       }
 507     }
 508   }
 509
 510   skia::RefPtr<SkShader> shader;
 511   if (filter_bitmap.isNull()) {
 512     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 513         *content, content_tile_mode, content_tile_mode, &content_mat));
 514   } else {
 515     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 516         filter_bitmap, content_tile_mode, content_tile_mode, &content_mat));
 517   }
 518   current_paint_.setShader(shader.get());
 519
 520   if (quad->mask_resource_id) {
 521     ResourceProvider::ScopedReadLockSoftware mask_lock(resource_provider_,
 522                                                        quad->mask_resource_id);
 523     if (!lock.valid())
 524       return;
 525     SkShader::TileMode mask_tile_mode = WrapModeToTileMode(
 526         mask_lock.wrap_mode());
 527
 528     const SkBitmap* mask = mask_lock.sk_bitmap();
 529
 530     // Scale normalized uv rect into absolute texel coordinates.
 531     SkRect mask_rect =
 532         gfx::RectFToSkRect(gfx::ScaleRect(quad->MaskUVRect(),
 533                                           quad->mask_texture_size.width(),
 534                                           quad->mask_texture_size.height()));
 535
 536     SkMatrix mask_mat;
 537     mask_mat.setRectToRect(mask_rect, dest_rect, SkMatrix::kFill_ScaleToFit);
 538
 539     skia::RefPtr<SkShader> mask_shader =
 540         skia::AdoptRef(SkShader::CreateBitmapShader(
 541             *mask, mask_tile_mode, mask_tile_mode, &mask_mat));
 542
 543     SkPaint mask_paint;
 544     mask_paint.setShader(mask_shader.get());
 545
 546     SkLayerRasterizer::Builder builder;
 547     builder.addLayer(mask_paint);
 548
 549     skia::RefPtr<SkLayerRasterizer> mask_rasterizer =
 550         skia::AdoptRef(builder.detachRasterizer());
 551
 552     current_paint_.setRasterizer(mask_rasterizer.get());
 553     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 554   } else {
 555     // TODO(skaslev): Apply background filters
 556     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 557   }
 558 }
 559
 560 void SoftwareRenderer::DrawUnsupportedQuad(const DrawingFrame* frame,
 561                                            const DrawQuad* quad) {
 562 #ifdef NDEBUG
 563   current_paint_.setColor(SK_ColorWHITE);
 564 #else
 565   current_paint_.setColor(SK_ColorMAGENTA);
 566 #endif
 567   current_paint_.setAlpha(quad->opacity() * 255);
 568   current_canvas_->drawRect(gfx::RectFToSkRect(QuadVertexRect()),
 569                             current_paint_);
 570 }
 571
 572 void SoftwareRenderer::CopyCurrentRenderPassToBitmap(
 573     DrawingFrame* frame,
 574     scoped_ptr<CopyOutputRequest> request) {
 575   gfx::Rect copy_rect = frame->current_render_pass->output_rect;
 576   if (request->has_area())
 577     copy_rect.Intersect(request->area());
 578   gfx::Rect window_copy_rect = MoveFromDrawToWindowSpace(frame, copy_rect);
 579
 580   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
 581   bitmap->setInfo(SkImageInfo::MakeN32Premul(window_copy_rect.width(),
 582                                              window_copy_rect.height()));
 583   current_canvas_->readPixels(
 584       bitmap.get(), window_copy_rect.x(), window_copy_rect.y());
 585
 586   request->SendBitmapResult(bitmap.Pass());
 587 }
 588
 589 void SoftwareRenderer::DiscardBackbuffer() {
 590   if (is_backbuffer_discarded_)
 591     return;
 592
 593   output_surface_->DiscardBackbuffer();
 594
 595   is_backbuffer_discarded_ = true;
 596
 597   // Damage tracker needs a full reset every time framebuffer is discarded.
 598   client_->SetFullRootLayerDamage();
 599 }
 600
 601 void SoftwareRenderer::EnsureBackbuffer() {
 602   if (!is_backbuffer_discarded_)
 603     return;
 604
 605   output_surface_->EnsureBackbuffer();
 606   is_backbuffer_discarded_ = false;
 607 }
 608
 609 void SoftwareRenderer::DidChangeVisibility() {
 610   if (visible())
 611     EnsureBackbuffer();
 612   else
 613     DiscardBackbuffer();
 614 }
 615
 616 }  // namespace cc