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/rect_conversions.h"
  31 #include "ui/gfx/skia_util.h"
  32 #include "ui/gfx/transform.h"
  33
  34 namespace cc {
  35
  36 namespace {
  37
  38 static inline bool IsScalarNearlyInteger(SkScalar scalar) {
  39   return SkScalarNearlyZero(scalar - SkScalarRoundToScalar(scalar));
  40 }
  41
  42 bool IsScaleAndIntegerTranslate(const SkMatrix& matrix) {
  43   return IsScalarNearlyInteger(matrix[SkMatrix::kMTransX]) &&
  44          IsScalarNearlyInteger(matrix[SkMatrix::kMTransY]) &&
  45          SkScalarNearlyZero(matrix[SkMatrix::kMSkewX]) &&
  46          SkScalarNearlyZero(matrix[SkMatrix::kMSkewY]) &&
  47          SkScalarNearlyZero(matrix[SkMatrix::kMPersp0]) &&
  48          SkScalarNearlyZero(matrix[SkMatrix::kMPersp1]) &&
  49          SkScalarNearlyZero(matrix[SkMatrix::kMPersp2] - 1.0f);
  50 }
  51
  52 static SkShader::TileMode WrapModeToTileMode(GLint wrap_mode) {
  53   switch (wrap_mode) {
  54     case GL_REPEAT:
  55       return SkShader::kRepeat_TileMode;
  56     case GL_CLAMP_TO_EDGE:
  57       return SkShader::kClamp_TileMode;
  58   }
  59   NOTREACHED();
  60   return SkShader::kClamp_TileMode;
  61 }
  62
  63 }  // anonymous namespace
  64
  65 scoped_ptr<SoftwareRenderer> SoftwareRenderer::Create(
  66     RendererClient* client,
  67     const LayerTreeSettings* settings,
  68     OutputSurface* output_surface,
  69     ResourceProvider* resource_provider) {
  70   return make_scoped_ptr(new SoftwareRenderer(
  71       client, settings, output_surface, resource_provider));
  72 }
  73
  74 SoftwareRenderer::SoftwareRenderer(RendererClient* client,
  75                                    const LayerTreeSettings* settings,
  76                                    OutputSurface* output_surface,
  77                                    ResourceProvider* resource_provider)
  78     : DirectRenderer(client, settings, output_surface, resource_provider),
  79       visible_(true),
  80       is_scissor_enabled_(false),
  81       is_backbuffer_discarded_(false),
  82       output_device_(output_surface->software_device()),
  83       current_canvas_(NULL) {
  84   if (resource_provider_) {
  85     capabilities_.max_texture_size = resource_provider_->max_texture_size();
  86     capabilities_.best_texture_format =
  87         resource_provider_->best_texture_format();
  88   }
  89   // The updater can access bitmaps while the SoftwareRenderer is using them.
  90   capabilities_.allow_partial_texture_updates = true;
  91   capabilities_.using_partial_swap = true;
  92
  93   capabilities_.using_map_image = settings_->use_map_image;
  94   capabilities_.using_shared_memory_resources = true;
  95 }
  96
  97 SoftwareRenderer::~SoftwareRenderer() {}
  98
  99 const RendererCapabilitiesImpl& SoftwareRenderer::Capabilities() const {
 100   return capabilities_;
 101 }
 102
 103 void SoftwareRenderer::BeginDrawingFrame(DrawingFrame* frame) {
 104   TRACE_EVENT0("cc", "SoftwareRenderer::BeginDrawingFrame");
 105   root_canvas_ = output_device_->BeginPaint(
 106       gfx::ToEnclosingRect(frame->root_damage_rect));
 107 }
 108
 109 void SoftwareRenderer::FinishDrawingFrame(DrawingFrame* frame) {
 110   TRACE_EVENT0("cc", "SoftwareRenderer::FinishDrawingFrame");
 111   current_framebuffer_lock_.reset();
 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   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 {
 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   SkBaseDevice* device = current_canvas_->getDevice();
 146   SetClipRect(gfx::Rect(device->width(), device->height()));
 147 }
 148
 149 void SoftwareRenderer::Finish() {}
 150
 151 void SoftwareRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
 152   DCHECK(!output_surface_->HasExternalStencilTest());
 153   current_framebuffer_lock_.reset();
 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_.reset();
 162   current_framebuffer_lock_ = make_scoped_ptr(
 163       new ResourceProvider::ScopedWriteLockSoftware(
 164           resource_provider_, texture->id()));
 165   current_canvas_ = current_framebuffer_lock_->sk_canvas();
 166   InitializeViewport(frame,
 167                      target_rect,
 168                      gfx::Rect(target_rect.size()),
 169                      target_rect.size());
 170   return true;
 171 }
 172
 173 void SoftwareRenderer::SetScissorTestRect(const gfx::Rect& scissor_rect) {
 174   is_scissor_enabled_ = true;
 175   scissor_rect_ = scissor_rect;
 176   SetClipRect(scissor_rect);
 177 }
 178
 179 void SoftwareRenderer::SetClipRect(const gfx::Rect& rect) {
 180   // Skia applies the current matrix to clip rects so we reset it temporary.
 181   SkMatrix current_matrix = current_canvas_->getTotalMatrix();
 182   current_canvas_->resetMatrix();
 183   current_canvas_->clipRect(gfx::RectToSkRect(rect), SkRegion::kReplace_Op);
 184   current_canvas_->setMatrix(current_matrix);
 185 }
 186
 187 void SoftwareRenderer::ClearCanvas(SkColor color) {
 188   // SkCanvas::clear doesn't respect the current clipping region
 189   // so we SkCanvas::drawColor instead if scissoring is active.
 190   if (is_scissor_enabled_)
 191     current_canvas_->drawColor(color, SkXfermode::kSrc_Mode);
 192   else
 193     current_canvas_->clear(color);
 194 }
 195
 196 void SoftwareRenderer::DiscardPixels(bool has_external_stencil_test,
 197                                      bool draw_rect_covers_full_surface) {}
 198
 199 void SoftwareRenderer::ClearFramebuffer(DrawingFrame* frame,
 200                                         bool has_external_stencil_test) {
 201   if (frame->current_render_pass->has_transparent_background) {
 202     ClearCanvas(SkColorSetARGB(0, 0, 0, 0));
 203   } else {
 204 #ifndef NDEBUG
 205     // On DEBUG builds, opaque render passes are cleared to blue
 206     // to easily see regions that were not drawn on the screen.
 207     ClearCanvas(SkColorSetARGB(255, 0, 0, 255));
 208 #endif
 209   }
 210 }
 211
 212 void SoftwareRenderer::SetDrawViewport(
 213     const gfx::Rect& window_space_viewport) {}
 214
 215 bool SoftwareRenderer::IsSoftwareResource(
 216     ResourceProvider::ResourceId resource_id) const {
 217   switch (resource_provider_->GetResourceType(resource_id)) {
 218     case ResourceProvider::GLTexture:
 219       return false;
 220     case ResourceProvider::Bitmap:
 221       return true;
 222     case ResourceProvider::InvalidType:
 223       break;
 224   }
 225
 226   LOG(FATAL) << "Invalid resource type.";
 227   return false;
 228 }
 229
 230 void SoftwareRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
 231   TRACE_EVENT0("cc", "SoftwareRenderer::DoDrawQuad");
 232   gfx::Transform quad_rect_matrix;
 233   QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
 234   gfx::Transform contents_device_transform =
 235       frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
 236   contents_device_transform.FlattenTo2d();
 237   SkMatrix sk_device_matrix;
 238   gfx::TransformToFlattenedSkMatrix(contents_device_transform,
 239                                     &sk_device_matrix);
 240   current_canvas_->setMatrix(sk_device_matrix);
 241
 242   current_paint_.reset();
 243   if (!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 && all_four_edges_are_exterior)
 251       current_paint_.setAntiAlias(true);
 252     current_paint_.setFilterBitmap(true);
 253   }
 254
 255   if (quad->ShouldDrawWithBlending()) {
 256     current_paint_.setAlpha(quad->opacity() * 255);
 257     current_paint_.setXfermodeMode(SkXfermode::kSrcOver_Mode);
 258   } else {
 259     current_paint_.setXfermodeMode(SkXfermode::kSrc_Mode);
 260   }
 261
 262   switch (quad->material) {
 263     case DrawQuad::CHECKERBOARD:
 264       DrawCheckerboardQuad(frame, CheckerboardDrawQuad::MaterialCast(quad));
 265       break;
 266     case DrawQuad::DEBUG_BORDER:
 267       DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
 268       break;
 269     case DrawQuad::PICTURE_CONTENT:
 270       DrawPictureQuad(frame, PictureDrawQuad::MaterialCast(quad));
 271       break;
 272     case DrawQuad::RENDER_PASS:
 273       DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad));
 274       break;
 275     case DrawQuad::SOLID_COLOR:
 276       DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad));
 277       break;
 278     case DrawQuad::TEXTURE_CONTENT:
 279       DrawTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
 280       break;
 281     case DrawQuad::TILED_CONTENT:
 282       DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad));
 283       break;
 284     case DrawQuad::SURFACE_CONTENT:
 285       // Surface content should be fully resolved to other quad types before
 286       // reaching a direct renderer.
 287       NOTREACHED();
 288       break;
 289     case DrawQuad::INVALID:
 290     case DrawQuad::IO_SURFACE_CONTENT:
 291     case DrawQuad::YUV_VIDEO_CONTENT:
 292     case DrawQuad::STREAM_VIDEO_CONTENT:
 293       DrawUnsupportedQuad(frame, quad);
 294       NOTREACHED();
 295       break;
 296   }
 297
 298   current_canvas_->resetMatrix();
 299 }
 300
 301 void SoftwareRenderer::DrawCheckerboardQuad(const DrawingFrame* frame,
 302                                             const CheckerboardDrawQuad* quad) {
 303   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 304       QuadVertexRect(), quad->rect, quad->visible_rect);
 305   current_paint_.setColor(quad->color);
 306   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 307   current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
 308                             current_paint_);
 309 }
 310
 311 void SoftwareRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
 312                                            const DebugBorderDrawQuad* quad) {
 313   // We need to apply the matrix manually to have pixel-sized stroke width.
 314   SkPoint vertices[4];
 315   gfx::RectFToSkRect(QuadVertexRect()).toQuad(vertices);
 316   SkPoint transformed_vertices[4];
 317   current_canvas_->getTotalMatrix().mapPoints(transformed_vertices,
 318                                               vertices,
 319                                               4);
 320   current_canvas_->resetMatrix();
 321
 322   current_paint_.setColor(quad->color);
 323   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 324   current_paint_.setStyle(SkPaint::kStroke_Style);
 325   current_paint_.setStrokeWidth(quad->width);
 326   current_canvas_->drawPoints(SkCanvas::kPolygon_PointMode,
 327                               4, transformed_vertices, current_paint_);
 328 }
 329
 330 void SoftwareRenderer::DrawPictureQuad(const DrawingFrame* frame,
 331                                        const PictureDrawQuad* quad) {
 332   SkMatrix content_matrix;
 333   content_matrix.setRectToRect(
 334       gfx::RectFToSkRect(quad->tex_coord_rect),
 335       gfx::RectFToSkRect(QuadVertexRect()),
 336       SkMatrix::kFill_ScaleToFit);
 337   current_canvas_->concat(content_matrix);
 338
 339   // TODO(aelias): This isn't correct in all cases. We should detect these
 340   // cases and fall back to a persistent bitmap backing
 341   // (http://crbug.com/280374).
 342   skia::RefPtr<SkDrawFilter> opacity_filter =
 343       skia::AdoptRef(new skia::OpacityDrawFilter(
 344           quad->opacity(), frame->disable_picture_quad_image_filtering));
 345   DCHECK(!current_canvas_->getDrawFilter());
 346   current_canvas_->setDrawFilter(opacity_filter.get());
 347
 348   TRACE_EVENT0("cc",
 349                "SoftwareRenderer::DrawPictureQuad");
 350   quad->picture_pile->RasterDirect(
 351       current_canvas_, quad->content_rect, quad->contents_scale, NULL);
 352
 353   current_canvas_->setDrawFilter(NULL);
 354 }
 355
 356 void SoftwareRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
 357                                           const SolidColorDrawQuad* quad) {
 358   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 359       QuadVertexRect(), quad->rect, quad->visible_rect);
 360   current_paint_.setColor(quad->color);
 361   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 362   current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
 363                             current_paint_);
 364 }
 365
 366 void SoftwareRenderer::DrawTextureQuad(const DrawingFrame* frame,
 367                                        const TextureDrawQuad* quad) {
 368   if (!IsSoftwareResource(quad->resource_id)) {
 369     DrawUnsupportedQuad(frame, quad);
 370     return;
 371   }
 372
 373   // TODO(skaslev): Add support for non-premultiplied alpha.
 374   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 375                                                 quad->resource_id);
 376   const SkBitmap* bitmap = lock.sk_bitmap();
 377   gfx::RectF uv_rect = gfx::ScaleRect(gfx::BoundingRect(quad->uv_top_left,
 378                                                         quad->uv_bottom_right),
 379                                       bitmap->width(),
 380                                       bitmap->height());
 381   gfx::RectF visible_uv_rect =
 382       MathUtil::ScaleRectProportional(uv_rect, quad->rect, quad->visible_rect);
 383   SkRect sk_uv_rect = gfx::RectFToSkRect(visible_uv_rect);
 384   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 385       QuadVertexRect(), quad->rect, quad->visible_rect);
 386   SkRect quad_rect = gfx::RectFToSkRect(visible_quad_vertex_rect);
 387
 388   if (quad->flipped)
 389     current_canvas_->scale(1, -1);
 390
 391   bool blend_background = quad->background_color != SK_ColorTRANSPARENT &&
 392                           !bitmap->isOpaque();
 393   bool needs_layer = blend_background && (current_paint_.getAlpha() != 0xFF);
 394   if (needs_layer) {
 395     current_canvas_->saveLayerAlpha(&quad_rect, current_paint_.getAlpha());
 396     current_paint_.setAlpha(0xFF);
 397   }
 398   if (blend_background) {
 399     SkPaint background_paint;
 400     background_paint.setColor(quad->background_color);
 401     current_canvas_->drawRect(quad_rect, background_paint);
 402   }
 403   SkShader::TileMode tile_mode = WrapModeToTileMode(lock.wrap_mode());
 404   if (tile_mode != SkShader::kClamp_TileMode) {
 405     SkMatrix matrix;
 406     matrix.setRectToRect(sk_uv_rect, quad_rect, SkMatrix::kFill_ScaleToFit);
 407     skia::RefPtr<SkShader> shader = skia::AdoptRef(
 408         SkShader::CreateBitmapShader(*bitmap, tile_mode, tile_mode));
 409     shader->setLocalMatrix(matrix);
 410     SkPaint paint;
 411     paint.setStyle(SkPaint::kFill_Style);
 412     paint.setShader(shader.get());
 413     current_canvas_->drawRect(quad_rect, paint);
 414   } else {
 415     current_canvas_->drawBitmapRectToRect(*bitmap,
 416                                           &sk_uv_rect,
 417                                           quad_rect,
 418                                           &current_paint_);
 419   }
 420
 421   if (needs_layer)
 422     current_canvas_->restore();
 423 }
 424
 425 void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
 426                                     const TileDrawQuad* quad) {
 427   DCHECK(!output_surface_->ForcedDrawToSoftwareDevice());
 428   DCHECK(IsSoftwareResource(quad->resource_id));
 429
 430   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 431                                                 quad->resource_id);
 432   DCHECK_EQ(GL_CLAMP_TO_EDGE, lock.wrap_mode());
 433
 434   gfx::RectF visible_tex_coord_rect = MathUtil::ScaleRectProportional(
 435       quad->tex_coord_rect, quad->rect, quad->visible_rect);
 436   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 437       QuadVertexRect(), quad->rect, quad->visible_rect);
 438
 439   SkRect uv_rect = gfx::RectFToSkRect(visible_tex_coord_rect);
 440   current_paint_.setFilterBitmap(true);
 441   current_canvas_->drawBitmapRectToRect(
 442       *lock.sk_bitmap(),
 443       &uv_rect,
 444       gfx::RectFToSkRect(visible_quad_vertex_rect),
 445       &current_paint_);
 446 }
 447
 448 void SoftwareRenderer::DrawRenderPassQuad(const DrawingFrame* frame,
 449                                           const RenderPassDrawQuad* quad) {
 450   ScopedResource* content_texture =
 451       render_pass_textures_.get(quad->render_pass_id);
 452   if (!content_texture || !content_texture->id())
 453     return;
 454
 455   DCHECK(IsSoftwareResource(content_texture->id()));
 456   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 457                                                 content_texture->id());
 458   SkShader::TileMode content_tile_mode = WrapModeToTileMode(lock.wrap_mode());
 459
 460   SkRect dest_rect = gfx::RectFToSkRect(QuadVertexRect());
 461   SkRect dest_visible_rect = gfx::RectFToSkRect(MathUtil::ScaleRectProportional(
 462       QuadVertexRect(), quad->rect, quad->visible_rect));
 463   SkRect content_rect = SkRect::MakeWH(quad->rect.width(), quad->rect.height());
 464
 465   SkMatrix content_mat;
 466   content_mat.setRectToRect(content_rect, dest_rect,
 467                             SkMatrix::kFill_ScaleToFit);
 468
 469   const SkBitmap* content = lock.sk_bitmap();
 470
 471   SkBitmap filter_bitmap;
 472   if (!quad->filters.IsEmpty()) {
 473     skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
 474         quad->filters, content_texture->size());
 475     // TODO(ajuma): In addition origin translation, the canvas should also be
 476     // scaled to accomodate device pixel ratio and pinch zoom. See
 477     // crbug.com/281516 and crbug.com/281518.
 478     // TODO(ajuma): Apply the filter in the same pass as the content where
 479     // possible (e.g. when there's no origin offset). See crbug.com/308201.
 480     if (filter) {
 481       bool is_opaque = false;
 482       skia::RefPtr<SkBaseDevice> device =
 483           skia::AdoptRef(new SkBitmapDevice(SkBitmap::kARGB_8888_Config,
 484                                             content_texture->size().width(),
 485                                             content_texture->size().height(),
 486                                             is_opaque));
 487       SkCanvas canvas(device.get());
 488       SkPaint paint;
 489       paint.setImageFilter(filter.get());
 490       canvas.clear(SK_ColorTRANSPARENT);
 491       canvas.translate(SkIntToScalar(-quad->rect.origin().x()),
 492                        SkIntToScalar(-quad->rect.origin().y()));
 493       canvas.drawSprite(*content, 0, 0, &paint);
 494       bool will_change_pixels = false;
 495       filter_bitmap = device->accessBitmap(will_change_pixels);
 496     }
 497   }
 498
 499   skia::RefPtr<SkShader> shader;
 500   if (filter_bitmap.isNull()) {
 501     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 502         *content, content_tile_mode, content_tile_mode));
 503   } else {
 504     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 505         filter_bitmap, content_tile_mode, content_tile_mode));
 506   }
 507   shader->setLocalMatrix(content_mat);
 508   current_paint_.setShader(shader.get());
 509
 510   if (quad->mask_resource_id) {
 511     ResourceProvider::ScopedReadLockSoftware mask_lock(resource_provider_,
 512                                                        quad->mask_resource_id);
 513     SkShader::TileMode mask_tile_mode = WrapModeToTileMode(
 514         mask_lock.wrap_mode());
 515
 516     const SkBitmap* mask = mask_lock.sk_bitmap();
 517
 518     SkRect mask_rect = SkRect::MakeXYWH(
 519         quad->mask_uv_rect.x() * mask->width(),
 520         quad->mask_uv_rect.y() * mask->height(),
 521         quad->mask_uv_rect.width() * mask->width(),
 522         quad->mask_uv_rect.height() * mask->height());
 523
 524     SkMatrix mask_mat;
 525     mask_mat.setRectToRect(mask_rect, dest_rect, SkMatrix::kFill_ScaleToFit);
 526
 527     skia::RefPtr<SkShader> mask_shader = skia::AdoptRef(
 528         SkShader::CreateBitmapShader(*mask, mask_tile_mode, mask_tile_mode));
 529     mask_shader->setLocalMatrix(mask_mat);
 530
 531     SkPaint mask_paint;
 532     mask_paint.setShader(mask_shader.get());
 533
 534     skia::RefPtr<SkLayerRasterizer> mask_rasterizer =
 535         skia::AdoptRef(new SkLayerRasterizer);
 536     mask_rasterizer->addLayer(mask_paint);
 537
 538     current_paint_.setRasterizer(mask_rasterizer.get());
 539     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 540   } else {
 541     // TODO(skaslev): Apply background filters and blend with content
 542     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 543   }
 544 }
 545
 546 void SoftwareRenderer::DrawUnsupportedQuad(const DrawingFrame* frame,
 547                                            const DrawQuad* quad) {
 548 #ifdef NDEBUG
 549   current_paint_.setColor(SK_ColorWHITE);
 550 #else
 551   current_paint_.setColor(SK_ColorMAGENTA);
 552 #endif
 553   current_paint_.setAlpha(quad->opacity() * 255);
 554   current_canvas_->drawRect(gfx::RectFToSkRect(QuadVertexRect()),
 555                             current_paint_);
 556 }
 557
 558 void SoftwareRenderer::CopyCurrentRenderPassToBitmap(
 559     DrawingFrame* frame,
 560     scoped_ptr<CopyOutputRequest> request) {
 561   gfx::Rect copy_rect = frame->current_render_pass->output_rect;
 562   if (request->has_area())
 563     copy_rect.Intersect(request->area());
 564   gfx::Rect window_copy_rect = MoveFromDrawToWindowSpace(copy_rect);
 565
 566   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
 567   bitmap->setConfig(SkBitmap::kARGB_8888_Config,
 568                     window_copy_rect.width(),
 569                     window_copy_rect.height());
 570   current_canvas_->readPixels(
 571       bitmap.get(), window_copy_rect.x(), window_copy_rect.y());
 572
 573   request->SendBitmapResult(bitmap.Pass());
 574 }
 575
 576 void SoftwareRenderer::DiscardBackbuffer() {
 577   if (is_backbuffer_discarded_)
 578     return;
 579
 580   output_surface_->DiscardBackbuffer();
 581
 582   is_backbuffer_discarded_ = true;
 583
 584   // Damage tracker needs a full reset every time framebuffer is discarded.
 585   client_->SetFullRootLayerDamage();
 586 }
 587
 588 void SoftwareRenderer::EnsureBackbuffer() {
 589   if (!is_backbuffer_discarded_)
 590     return;
 591
 592   output_surface_->EnsureBackbuffer();
 593   is_backbuffer_discarded_ = false;
 594 }
 595
 596 void SoftwareRenderer::GetFramebufferPixels(void* pixels,
 597                                             const gfx::Rect& rect) {
 598   TRACE_EVENT0("cc", "SoftwareRenderer::GetFramebufferPixels");
 599   SkBitmap subset_bitmap;
 600   gfx::Rect frame_rect(rect);
 601   frame_rect += current_viewport_rect_.OffsetFromOrigin();
 602   output_device_->CopyToBitmap(frame_rect, &subset_bitmap);
 603   subset_bitmap.copyPixelsTo(pixels,
 604                              4 * frame_rect.width() * frame_rect.height(),
 605                              4 * frame_rect.width());
 606 }
 607
 608 void SoftwareRenderer::SetVisible(bool visible) {
 609   if (visible_ == visible)
 610     return;
 611   visible_ = visible;
 612
 613   if (visible_)
 614     EnsureBackbuffer();
 615   else
 616     DiscardBackbuffer();
 617 }
 618
 619 }  // namespace cc