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 {
 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 (!IsScaleAndIntegerTranslate(sk_device_matrix)) {
 243     // TODO(danakj): Until we can enable AA only on exterior edges of the
 244     // layer, disable AA if any interior edges are present. crbug.com/248175
 245     bool all_four_edges_are_exterior = quad->IsTopEdge() &&
 246                                        quad->IsLeftEdge() &&
 247                                        quad->IsBottomEdge() &&
 248                                        quad->IsRightEdge();
 249     if (settings_->allow_antialiasing && all_four_edges_are_exterior)
 250       current_paint_.setAntiAlias(true);
 251     current_paint_.setFilterLevel(SkPaint::kLow_FilterLevel);
 252   }
 253
 254   if (quad->ShouldDrawWithBlending() ||
 255       quad->shared_quad_state->blend_mode != SkXfermode::kSrcOver_Mode) {
 256     current_paint_.setAlpha(quad->opacity() * 255);
 257     current_paint_.setXfermodeMode(quad->shared_quad_state->blend_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
 351   quad->picture_pile->RasterDirect(
 352       current_canvas_, quad->content_rect, quad->contents_scale, NULL);
 353
 354   current_canvas_->setDrawFilter(NULL);
 355 }
 356
 357 void SoftwareRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
 358                                           const SolidColorDrawQuad* quad) {
 359   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 360       QuadVertexRect(), quad->rect, quad->visible_rect);
 361   current_paint_.setColor(quad->color);
 362   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 363   current_canvas_->drawRect(gfx::RectFToSkRect(visible_quad_vertex_rect),
 364                             current_paint_);
 365 }
 366
 367 void SoftwareRenderer::DrawTextureQuad(const DrawingFrame* frame,
 368                                        const TextureDrawQuad* quad) {
 369   if (!IsSoftwareResource(quad->resource_id)) {
 370     DrawUnsupportedQuad(frame, quad);
 371     return;
 372   }
 373
 374   // TODO(skaslev): Add support for non-premultiplied alpha.
 375   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 376                                                 quad->resource_id);
 377   if (!lock.valid())
 378     return;
 379   const SkBitmap* bitmap = lock.sk_bitmap();
 380   gfx::RectF uv_rect = gfx::ScaleRect(gfx::BoundingRect(quad->uv_top_left,
 381                                                         quad->uv_bottom_right),
 382                                       bitmap->width(),
 383                                       bitmap->height());
 384   gfx::RectF visible_uv_rect =
 385       MathUtil::ScaleRectProportional(uv_rect, quad->rect, quad->visible_rect);
 386   SkRect sk_uv_rect = gfx::RectFToSkRect(visible_uv_rect);
 387   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 388       QuadVertexRect(), quad->rect, quad->visible_rect);
 389   SkRect quad_rect = gfx::RectFToSkRect(visible_quad_vertex_rect);
 390
 391   if (quad->flipped)
 392     current_canvas_->scale(1, -1);
 393
 394   bool blend_background = quad->background_color != SK_ColorTRANSPARENT &&
 395                           !bitmap->isOpaque();
 396   bool needs_layer = blend_background && (current_paint_.getAlpha() != 0xFF);
 397   if (needs_layer) {
 398     current_canvas_->saveLayerAlpha(&quad_rect, current_paint_.getAlpha());
 399     current_paint_.setAlpha(0xFF);
 400   }
 401   if (blend_background) {
 402     SkPaint background_paint;
 403     background_paint.setColor(quad->background_color);
 404     current_canvas_->drawRect(quad_rect, background_paint);
 405   }
 406   SkShader::TileMode tile_mode = WrapModeToTileMode(lock.wrap_mode());
 407   if (tile_mode != SkShader::kClamp_TileMode) {
 408     SkMatrix matrix;
 409     matrix.setRectToRect(sk_uv_rect, quad_rect, SkMatrix::kFill_ScaleToFit);
 410     skia::RefPtr<SkShader> shader = skia::AdoptRef(
 411         SkShader::CreateBitmapShader(*bitmap, tile_mode, tile_mode, &matrix));
 412     SkPaint paint;
 413     paint.setStyle(SkPaint::kFill_Style);
 414     paint.setShader(shader.get());
 415     current_canvas_->drawRect(quad_rect, paint);
 416   } else {
 417     current_canvas_->drawBitmapRectToRect(*bitmap,
 418                                           &sk_uv_rect,
 419                                           quad_rect,
 420                                           &current_paint_);
 421   }
 422
 423   if (needs_layer)
 424     current_canvas_->restore();
 425 }
 426
 427 void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
 428                                     const TileDrawQuad* quad) {
 429   // |resource_provider_| can be NULL in resourceless software draws, which
 430   // should never produce tile quads in the first place.
 431   DCHECK(resource_provider_);
 432   DCHECK(IsSoftwareResource(quad->resource_id));
 433
 434   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 435                                                 quad->resource_id);
 436   if (!lock.valid())
 437     return;
 438   DCHECK_EQ(GL_CLAMP_TO_EDGE, lock.wrap_mode());
 439
 440   gfx::RectF visible_tex_coord_rect = MathUtil::ScaleRectProportional(
 441       quad->tex_coord_rect, quad->rect, quad->visible_rect);
 442   gfx::RectF visible_quad_vertex_rect = MathUtil::ScaleRectProportional(
 443       QuadVertexRect(), quad->rect, quad->visible_rect);
 444
 445   SkRect uv_rect = gfx::RectFToSkRect(visible_tex_coord_rect);
 446   current_paint_.setFilterLevel(SkPaint::kLow_FilterLevel);
 447   current_canvas_->drawBitmapRectToRect(
 448       *lock.sk_bitmap(),
 449       &uv_rect,
 450       gfx::RectFToSkRect(visible_quad_vertex_rect),
 451       &current_paint_);
 452 }
 453
 454 void SoftwareRenderer::DrawRenderPassQuad(const DrawingFrame* frame,
 455                                           const RenderPassDrawQuad* quad) {
 456   ScopedResource* content_texture =
 457       render_pass_textures_.get(quad->render_pass_id);
 458   if (!content_texture || !content_texture->id())
 459     return;
 460
 461   DCHECK(IsSoftwareResource(content_texture->id()));
 462   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 463                                                 content_texture->id());
 464   if (!lock.valid())
 465     return;
 466   SkShader::TileMode content_tile_mode = WrapModeToTileMode(lock.wrap_mode());
 467
 468   SkRect dest_rect = gfx::RectFToSkRect(QuadVertexRect());
 469   SkRect dest_visible_rect = gfx::RectFToSkRect(MathUtil::ScaleRectProportional(
 470       QuadVertexRect(), quad->rect, quad->visible_rect));
 471   SkRect content_rect = SkRect::MakeWH(quad->rect.width(), quad->rect.height());
 472
 473   SkMatrix content_mat;
 474   content_mat.setRectToRect(content_rect, dest_rect,
 475                             SkMatrix::kFill_ScaleToFit);
 476
 477   const SkBitmap* content = lock.sk_bitmap();
 478
 479   SkBitmap filter_bitmap;
 480   if (!quad->filters.IsEmpty()) {
 481     skia::RefPtr<SkImageFilter> filter = RenderSurfaceFilters::BuildImageFilter(
 482         quad->filters, content_texture->size());
 483     // TODO(ajuma): Apply the filter in the same pass as the content where
 484     // possible (e.g. when there's no origin offset). See crbug.com/308201.
 485     if (filter) {
 486       SkImageInfo info = SkImageInfo::MakeN32Premul(
 487           content_texture->size().width(), content_texture->size().height());
 488       if (filter_bitmap.tryAllocPixels(info)) {
 489         SkCanvas canvas(filter_bitmap);
 490         SkPaint paint;
 491         paint.setImageFilter(filter.get());
 492         canvas.clear(SK_ColorTRANSPARENT);
 493         canvas.translate(SkIntToScalar(-quad->rect.origin().x()),
 494                          SkIntToScalar(-quad->rect.origin().y()));
 495         canvas.scale(quad->filters_scale.x(), quad->filters_scale.y());
 496         canvas.drawSprite(*content, 0, 0, &paint);
 497       }
 498     }
 499   }
 500
 501   skia::RefPtr<SkShader> shader;
 502   if (filter_bitmap.isNull()) {
 503     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 504         *content, content_tile_mode, content_tile_mode, &content_mat));
 505   } else {
 506     shader = skia::AdoptRef(SkShader::CreateBitmapShader(
 507         filter_bitmap, content_tile_mode, content_tile_mode, &content_mat));
 508   }
 509   current_paint_.setShader(shader.get());
 510
 511   if (quad->mask_resource_id) {
 512     ResourceProvider::ScopedReadLockSoftware mask_lock(resource_provider_,
 513                                                        quad->mask_resource_id);
 514     if (!lock.valid())
 515       return;
 516     SkShader::TileMode mask_tile_mode = WrapModeToTileMode(
 517         mask_lock.wrap_mode());
 518
 519     const SkBitmap* mask = mask_lock.sk_bitmap();
 520
 521     // Scale normalized uv rect into absolute texel coordinates.
 522     SkRect mask_rect =
 523         gfx::RectFToSkRect(gfx::ScaleRect(quad->MaskUVRect(),
 524                                           quad->mask_texture_size.width(),
 525                                           quad->mask_texture_size.height()));
 526
 527     SkMatrix mask_mat;
 528     mask_mat.setRectToRect(mask_rect, dest_rect, SkMatrix::kFill_ScaleToFit);
 529
 530     skia::RefPtr<SkShader> mask_shader =
 531         skia::AdoptRef(SkShader::CreateBitmapShader(
 532             *mask, mask_tile_mode, mask_tile_mode, &mask_mat));
 533
 534     SkPaint mask_paint;
 535     mask_paint.setShader(mask_shader.get());
 536
 537     SkLayerRasterizer::Builder builder;
 538     builder.addLayer(mask_paint);
 539
 540     skia::RefPtr<SkLayerRasterizer> mask_rasterizer =
 541         skia::AdoptRef(builder.detachRasterizer());
 542
 543     current_paint_.setRasterizer(mask_rasterizer.get());
 544     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 545   } else {
 546     // TODO(skaslev): Apply background filters
 547     current_canvas_->drawRect(dest_visible_rect, current_paint_);
 548   }
 549 }
 550
 551 void SoftwareRenderer::DrawUnsupportedQuad(const DrawingFrame* frame,
 552                                            const DrawQuad* quad) {
 553 #ifdef NDEBUG
 554   current_paint_.setColor(SK_ColorWHITE);
 555 #else
 556   current_paint_.setColor(SK_ColorMAGENTA);
 557 #endif
 558   current_paint_.setAlpha(quad->opacity() * 255);
 559   current_canvas_->drawRect(gfx::RectFToSkRect(QuadVertexRect()),
 560                             current_paint_);
 561 }
 562
 563 void SoftwareRenderer::CopyCurrentRenderPassToBitmap(
 564     DrawingFrame* frame,
 565     scoped_ptr<CopyOutputRequest> request) {
 566   gfx::Rect copy_rect = frame->current_render_pass->output_rect;
 567   if (request->has_area())
 568     copy_rect.Intersect(request->area());
 569   gfx::Rect window_copy_rect = MoveFromDrawToWindowSpace(copy_rect);
 570
 571   scoped_ptr<SkBitmap> bitmap(new SkBitmap);
 572   bitmap->setInfo(SkImageInfo::MakeN32Premul(window_copy_rect.width(),
 573                                              window_copy_rect.height()));
 574   current_canvas_->readPixels(
 575       bitmap.get(), window_copy_rect.x(), window_copy_rect.y());
 576
 577   request->SendBitmapResult(bitmap.Pass());
 578 }
 579
 580 void SoftwareRenderer::DiscardBackbuffer() {
 581   if (is_backbuffer_discarded_)
 582     return;
 583
 584   output_surface_->DiscardBackbuffer();
 585
 586   is_backbuffer_discarded_ = true;
 587
 588   // Damage tracker needs a full reset every time framebuffer is discarded.
 589   client_->SetFullRootLayerDamage();
 590 }
 591
 592 void SoftwareRenderer::EnsureBackbuffer() {
 593   if (!is_backbuffer_discarded_)
 594     return;
 595
 596   output_surface_->EnsureBackbuffer();
 597   is_backbuffer_discarded_ = false;
 598 }
 599
 600 void SoftwareRenderer::DidChangeVisibility() {
 601   if (visible())
 602     EnsureBackbuffer();
 603   else
 604     DiscardBackbuffer();
 605 }
 606
 607 }  // namespace cc