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/output_surface.h"
  13 #include "cc/output/software_output_device.h"
  14 #include "cc/quads/debug_border_draw_quad.h"
  15 #include "cc/quads/render_pass_draw_quad.h"
  16 #include "cc/quads/solid_color_draw_quad.h"
  17 #include "cc/quads/texture_draw_quad.h"
  18 #include "cc/quads/tile_draw_quad.h"
  19 #include "third_party/skia/include/core/SkCanvas.h"
  20 #include "third_party/skia/include/core/SkColor.h"
  21 #include "third_party/skia/include/core/SkDevice.h"
  22 #include "third_party/skia/include/core/SkMatrix.h"
  23 #include "third_party/skia/include/core/SkShader.h"
  24 #include "third_party/skia/include/effects/SkLayerRasterizer.h"
  25 #include "ui/gfx/rect_conversions.h"
  26 #include "ui/gfx/skia_util.h"
  27 #include "ui/gfx/transform.h"
  28
  29 namespace cc {
  30
  31 namespace {
  32
  33 void ToSkMatrix(SkMatrix* flattened, const gfx::Transform& m) {
  34   // Convert from 4x4 to 3x3 by dropping the third row and column.
  35   flattened->set(0, SkDoubleToScalar(m.matrix().getDouble(0, 0)));
  36   flattened->set(1, SkDoubleToScalar(m.matrix().getDouble(0, 1)));
  37   flattened->set(2, SkDoubleToScalar(m.matrix().getDouble(0, 3)));
  38   flattened->set(3, SkDoubleToScalar(m.matrix().getDouble(1, 0)));
  39   flattened->set(4, SkDoubleToScalar(m.matrix().getDouble(1, 1)));
  40   flattened->set(5, SkDoubleToScalar(m.matrix().getDouble(1, 3)));
  41   flattened->set(6, SkDoubleToScalar(m.matrix().getDouble(3, 0)));
  42   flattened->set(7, SkDoubleToScalar(m.matrix().getDouble(3, 1)));
  43   flattened->set(8, SkDoubleToScalar(m.matrix().getDouble(3, 3)));
  44 }
  45
  46 bool IsScaleAndTranslate(const SkMatrix& matrix) {
  47   return SkScalarNearlyZero(matrix[SkMatrix::kMSkewX]) &&
  48          SkScalarNearlyZero(matrix[SkMatrix::kMSkewY]) &&
  49          SkScalarNearlyZero(matrix[SkMatrix::kMPersp0]) &&
  50          SkScalarNearlyZero(matrix[SkMatrix::kMPersp1]) &&
  51          SkScalarNearlyZero(matrix[SkMatrix::kMPersp2] - 1.0f);
  52 }
  53
  54 }  // anonymous namespace
  55
  56 scoped_ptr<SoftwareRenderer> SoftwareRenderer::Create(
  57     RendererClient* client,
  58     OutputSurface* output_surface,
  59     ResourceProvider* resource_provider) {
  60   return make_scoped_ptr(
  61       new SoftwareRenderer(client, output_surface, resource_provider));
  62 }
  63
  64 SoftwareRenderer::SoftwareRenderer(RendererClient* client,
  65                                    OutputSurface* output_surface,
  66                                    ResourceProvider* resource_provider)
  67   : DirectRenderer(client, resource_provider),
  68     visible_(true),
  69     is_scissor_enabled_(false),
  70     is_viewport_changed_(true),
  71     output_surface_(output_surface),
  72     output_device_(output_surface->software_device()),
  73     current_canvas_(NULL) {
  74   resource_provider_->set_default_resource_type(ResourceProvider::Bitmap);
  75
  76   capabilities_.max_texture_size = resource_provider_->max_texture_size();
  77   capabilities_.best_texture_format = resource_provider_->best_texture_format();
  78   capabilities_.using_set_visibility = true;
  79   // The updater can access bitmaps while the SoftwareRenderer is using them.
  80   capabilities_.allow_partial_texture_updates = true;
  81   capabilities_.using_partial_swap = true;
  82   if (Settings().compositor_frame_message && client_->HasImplThread())
  83     capabilities_.using_swap_complete_callback = true;
  84   compositor_frame_.software_frame_data.reset(new SoftwareFrameData());
  85 }
  86
  87 SoftwareRenderer::~SoftwareRenderer() {}
  88
  89 const RendererCapabilities& SoftwareRenderer::Capabilities() const {
  90   return capabilities_;
  91 }
  92
  93 void SoftwareRenderer::ViewportChanged() {
  94   is_viewport_changed_ = true;
  95 }
  96
  97 void SoftwareRenderer::BeginDrawingFrame(DrawingFrame* frame) {
  98   TRACE_EVENT0("cc", "SoftwareRenderer::BeginDrawingFrame");
  99   if (is_viewport_changed_) {
 100     is_viewport_changed_ = false;
 101     output_device_->Resize(ViewportSize());
 102   }
 103   root_canvas_ = output_device_->BeginPaint(
 104       gfx::ToEnclosingRect(frame->root_damage_rect));
 105 }
 106
 107 void SoftwareRenderer::FinishDrawingFrame(DrawingFrame* frame) {
 108   TRACE_EVENT0("cc", "SoftwareRenderer::FinishDrawingFrame");
 109   current_framebuffer_lock_.reset();
 110   current_canvas_ = NULL;
 111   root_canvas_ = NULL;
 112   if (Settings().compositor_frame_message) {
 113     compositor_frame_.metadata = client_->MakeCompositorFrameMetadata();
 114     output_device_->EndPaint(compositor_frame_.software_frame_data.get());
 115   } else {
 116     output_device_->EndPaint(NULL);
 117   }
 118 }
 119
 120 bool SoftwareRenderer::SwapBuffers() {
 121   if (Settings().compositor_frame_message)
 122     output_surface_->SendFrameToParentCompositor(&compositor_frame_);
 123   return true;
 124 }
 125
 126 void SoftwareRenderer::ReceiveCompositorFrameAck(
 127     const CompositorFrameAck& ack) {
 128   if (capabilities_.using_swap_complete_callback)
 129     client_->OnSwapBuffersComplete();
 130   output_device_->ReclaimDIB(ack.last_dib_id);
 131 }
 132
 133 bool SoftwareRenderer::FlippedFramebuffer() const {
 134   return false;
 135 }
 136
 137 void SoftwareRenderer::EnsureScissorTestEnabled() {
 138   is_scissor_enabled_ = true;
 139   SetClipRect(scissor_rect_);
 140 }
 141
 142 void SoftwareRenderer::EnsureScissorTestDisabled() {
 143   // There is no explicit notion of enabling/disabling scissoring in software
 144   // rendering, but the underlying effect we want is to clear any existing
 145   // clipRect on the current SkCanvas. This is done by setting clipRect to
 146   // the viewport's dimensions.
 147   is_scissor_enabled_ = false;
 148   SkDevice* device = current_canvas_->getDevice();
 149   SetClipRect(gfx::Rect(device->width(), device->height()));
 150 }
 151
 152 void SoftwareRenderer::Finish() {}
 153
 154 void SoftwareRenderer::BindFramebufferToOutputSurface(DrawingFrame* frame) {
 155   current_framebuffer_lock_.reset();
 156   current_canvas_ = root_canvas_;
 157 }
 158
 159 bool SoftwareRenderer::BindFramebufferToTexture(
 160     DrawingFrame* frame,
 161     const ScopedResource* texture,
 162     gfx::Rect framebuffer_rect) {
 163   current_framebuffer_lock_ = make_scoped_ptr(
 164       new ResourceProvider::ScopedWriteLockSoftware(
 165           resource_provider_, texture->id()));
 166   current_canvas_ = current_framebuffer_lock_->sk_canvas();
 167   InitializeMatrices(frame, framebuffer_rect, false);
 168   SetDrawViewportSize(framebuffer_rect.size());
 169
 170   return true;
 171 }
 172
 173 void SoftwareRenderer::SetScissorTestRect(gfx::Rect scissor_rect) {
 174   is_scissor_enabled_ = true;
 175   scissor_rect_ = scissor_rect;
 176   SetClipRect(scissor_rect);
 177 }
 178
 179 void SoftwareRenderer::SetClipRect(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::ClearFramebuffer(DrawingFrame* frame) {
 197   if (frame->current_render_pass->has_transparent_background) {
 198     ClearCanvas(SkColorSetARGB(0, 0, 0, 0));
 199   } else {
 200 #ifndef NDEBUG
 201     // On DEBUG builds, opaque render passes are cleared to blue
 202     // to easily see regions that were not drawn on the screen.
 203     ClearCanvas(SkColorSetARGB(255, 0, 0, 255));
 204 #endif
 205   }
 206 }
 207
 208 void SoftwareRenderer::SetDrawViewportSize(gfx::Size viewport_size) {}
 209
 210 bool SoftwareRenderer::IsSoftwareResource(
 211     ResourceProvider::ResourceId resource_id) const {
 212   switch (resource_provider_->GetResourceType(resource_id)) {
 213     case ResourceProvider::GLTexture:
 214       return false;
 215     case ResourceProvider::Bitmap:
 216       return true;
 217   }
 218
 219   LOG(FATAL) << "Invalid resource type.";
 220   return false;
 221 }
 222
 223 void SoftwareRenderer::DoDrawQuad(DrawingFrame* frame, const DrawQuad* quad) {
 224   TRACE_EVENT0("cc", "SoftwareRenderer::DoDrawQuad");
 225   gfx::Transform quad_rect_matrix;
 226   QuadRectTransform(&quad_rect_matrix, quad->quadTransform(), quad->rect);
 227   gfx::Transform contents_device_transform =
 228       frame->window_matrix * frame->projection_matrix * quad_rect_matrix;
 229   contents_device_transform.FlattenTo2d();
 230   SkMatrix sk_device_matrix;
 231   ToSkMatrix(&sk_device_matrix, contents_device_transform);
 232   current_canvas_->setMatrix(sk_device_matrix);
 233
 234   current_paint_.reset();
 235   if (!IsScaleAndTranslate(sk_device_matrix)) {
 236     current_paint_.setAntiAlias(true);
 237     current_paint_.setFilterBitmap(true);
 238   }
 239
 240   if (quad->ShouldDrawWithBlending()) {
 241     current_paint_.setAlpha(quad->opacity() * 255);
 242     current_paint_.setXfermodeMode(SkXfermode::kSrcOver_Mode);
 243   } else {
 244     current_paint_.setXfermodeMode(SkXfermode::kSrc_Mode);
 245   }
 246
 247   switch (quad->material) {
 248     case DrawQuad::DEBUG_BORDER:
 249       DrawDebugBorderQuad(frame, DebugBorderDrawQuad::MaterialCast(quad));
 250       break;
 251     case DrawQuad::SOLID_COLOR:
 252       DrawSolidColorQuad(frame, SolidColorDrawQuad::MaterialCast(quad));
 253       break;
 254     case DrawQuad::TEXTURE_CONTENT:
 255       DrawTextureQuad(frame, TextureDrawQuad::MaterialCast(quad));
 256       break;
 257     case DrawQuad::TILED_CONTENT:
 258       DrawTileQuad(frame, TileDrawQuad::MaterialCast(quad));
 259       break;
 260     case DrawQuad::RENDER_PASS:
 261       DrawRenderPassQuad(frame, RenderPassDrawQuad::MaterialCast(quad));
 262       break;
 263     default:
 264       DrawUnsupportedQuad(frame, quad);
 265       break;
 266   }
 267
 268   current_canvas_->resetMatrix();
 269 }
 270
 271 void SoftwareRenderer::DrawDebugBorderQuad(const DrawingFrame* frame,
 272                                            const DebugBorderDrawQuad* quad) {
 273   // We need to apply the matrix manually to have pixel-sized stroke width.
 274   SkPoint vertices[4];
 275   gfx::RectFToSkRect(QuadVertexRect()).toQuad(vertices);
 276   SkPoint transformed_vertices[4];
 277   current_canvas_->getTotalMatrix().mapPoints(transformed_vertices,
 278                                               vertices,
 279                                               4);
 280   current_canvas_->resetMatrix();
 281
 282   current_paint_.setColor(quad->color);
 283   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 284   current_paint_.setStyle(SkPaint::kStroke_Style);
 285   current_paint_.setStrokeWidth(quad->width);
 286   current_canvas_->drawPoints(SkCanvas::kPolygon_PointMode,
 287                               4, transformed_vertices, current_paint_);
 288 }
 289
 290 void SoftwareRenderer::DrawSolidColorQuad(const DrawingFrame* frame,
 291                                           const SolidColorDrawQuad* quad) {
 292   current_paint_.setColor(quad->color);
 293   current_paint_.setAlpha(quad->opacity() * SkColorGetA(quad->color));
 294   current_canvas_->drawRect(gfx::RectFToSkRect(QuadVertexRect()),
 295                             current_paint_);
 296 }
 297
 298 void SoftwareRenderer::DrawTextureQuad(const DrawingFrame* frame,
 299                                        const TextureDrawQuad* quad) {
 300   if (!IsSoftwareResource(quad->resource_id)) {
 301     DrawUnsupportedQuad(frame, quad);
 302     return;
 303   }
 304
 305   // FIXME: Add support for non-premultiplied alpha.
 306   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 307                                                 quad->resource_id);
 308   const SkBitmap* bitmap = lock.sk_bitmap();
 309   gfx::RectF uv_rect = gfx::ScaleRect(gfx::BoundingRect(quad->uv_top_left,
 310                                                         quad->uv_bottom_right),
 311                                       bitmap->width(),
 312                                       bitmap->height());
 313   SkRect sk_uv_rect = gfx::RectFToSkRect(uv_rect);
 314   if (quad->flipped)
 315     current_canvas_->scale(1, -1);
 316   current_canvas_->drawBitmapRectToRect(*bitmap, &sk_uv_rect,
 317                                         gfx::RectFToSkRect(QuadVertexRect()),
 318                                         &current_paint_);
 319 }
 320
 321 void SoftwareRenderer::DrawTileQuad(const DrawingFrame* frame,
 322                                     const TileDrawQuad* quad) {
 323   DCHECK(IsSoftwareResource(quad->resource_id));
 324   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 325                                                 quad->resource_id);
 326
 327   SkRect uv_rect = gfx::RectFToSkRect(quad->tex_coord_rect);
 328   current_paint_.setFilterBitmap(true);
 329   current_canvas_->drawBitmapRectToRect(*lock.sk_bitmap(), &uv_rect,
 330                                         gfx::RectFToSkRect(QuadVertexRect()),
 331                                         &current_paint_);
 332 }
 333
 334 void SoftwareRenderer::DrawRenderPassQuad(const DrawingFrame* frame,
 335                                           const RenderPassDrawQuad* quad) {
 336   CachedResource* content_texture =
 337       render_pass_textures_.get(quad->render_pass_id);
 338   if (!content_texture || !content_texture->id())
 339     return;
 340
 341   DCHECK(IsSoftwareResource(content_texture->id()));
 342   ResourceProvider::ScopedReadLockSoftware lock(resource_provider_,
 343                                                 content_texture->id());
 344
 345   SkRect dest_rect = gfx::RectFToSkRect(QuadVertexRect());
 346   SkRect content_rect = SkRect::MakeWH(quad->rect.width(), quad->rect.height());
 347
 348   SkMatrix content_mat;
 349   content_mat.setRectToRect(content_rect, dest_rect,
 350                             SkMatrix::kFill_ScaleToFit);
 351
 352   const SkBitmap* content = lock.sk_bitmap();
 353   skia::RefPtr<SkShader> shader = skia::AdoptRef(
 354       SkShader::CreateBitmapShader(*content,
 355                                    SkShader::kClamp_TileMode,
 356                                    SkShader::kClamp_TileMode));
 357   shader->setLocalMatrix(content_mat);
 358   current_paint_.setShader(shader.get());
 359
 360   SkImageFilter* filter = quad->filter.get();
 361   if (filter)
 362     current_paint_.setImageFilter(filter);
 363
 364   if (quad->mask_resource_id) {
 365     ResourceProvider::ScopedReadLockSoftware mask_lock(resource_provider_,
 366                                                        quad->mask_resource_id);
 367
 368     const SkBitmap* mask = mask_lock.sk_bitmap();
 369
 370     SkRect mask_rect = SkRect::MakeXYWH(
 371         quad->mask_uv_rect.x() * mask->width(),
 372         quad->mask_uv_rect.y() * mask->height(),
 373         quad->mask_uv_rect.width() * mask->width(),
 374         quad->mask_uv_rect.height() * mask->height());
 375
 376     SkMatrix mask_mat;
 377     mask_mat.setRectToRect(mask_rect, dest_rect, SkMatrix::kFill_ScaleToFit);
 378
 379     skia::RefPtr<SkShader> mask_shader = skia::AdoptRef(
 380         SkShader::CreateBitmapShader(*mask,
 381                                      SkShader::kClamp_TileMode,
 382                                      SkShader::kClamp_TileMode));
 383     mask_shader->setLocalMatrix(mask_mat);
 384
 385     SkPaint mask_paint;
 386     mask_paint.setShader(mask_shader.get());
 387
 388     skia::RefPtr<SkLayerRasterizer> mask_rasterizer =
 389         skia::AdoptRef(new SkLayerRasterizer);
 390     mask_rasterizer->addLayer(mask_paint);
 391
 392     current_paint_.setRasterizer(mask_rasterizer.get());
 393     current_canvas_->drawRect(dest_rect, current_paint_);
 394   } else {
 395     // FIXME: Apply background filters and blend with content
 396     current_canvas_->drawRect(dest_rect, current_paint_);
 397   }
 398 }
 399
 400 void SoftwareRenderer::DrawUnsupportedQuad(const DrawingFrame* frame,
 401                                            const DrawQuad* quad) {
 402 #ifdef NDEBUG
 403   current_paint_.setColor(SK_ColorWHITE);
 404 #else
 405   current_paint_.setColor(SK_ColorMAGENTA);
 406 #endif
 407   current_paint_.setAlpha(quad->opacity() * 255);
 408   current_canvas_->drawRect(gfx::RectFToSkRect(QuadVertexRect()),
 409                             current_paint_);
 410 }
 411
 412 void SoftwareRenderer::GetFramebufferPixels(void* pixels, gfx::Rect rect) {
 413   TRACE_EVENT0("cc", "SoftwareRenderer::GetFramebufferPixels");
 414   SkBitmap subset_bitmap;
 415   output_device_->CopyToBitmap(rect, &subset_bitmap);
 416   subset_bitmap.copyPixelsTo(pixels,
 417                              4 * rect.width() * rect.height(),
 418                              4 * rect.width());
 419 }
 420
 421 void SoftwareRenderer::SetVisible(bool visible) {
 422   if (visible_ == visible)
 423     return;
 424   visible_ = visible;
 425 }
 426
 427 }  // namespace cc