cc/output/direct_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/direct_renderer.h"
   6
   7 #include <utility>
   8 #include <vector>
   9
  10 #include "base/containers/hash_tables.h"
  11 #include "base/containers/scoped_ptr_hash_map.h"
  12 #include "base/metrics/histogram.h"
  13 #include "base/trace_event/trace_event.h"
  14 #include "cc/base/math_util.h"
  15 #include "cc/output/bsp_tree.h"
  16 #include "cc/output/bsp_walk_action.h"
  17 #include "cc/output/copy_output_request.h"
  18 #include "cc/quads/draw_quad.h"
  19 #include "ui/gfx/geometry/rect_conversions.h"
  20 #include "ui/gfx/transform.h"
  21
  22 static gfx::Transform OrthoProjectionMatrix(float left,
  23                                             float right,
  24                                             float bottom,
  25                                             float top) {
  26   // Use the standard formula to map the clipping frustum to the cube from
  27   // [-1, -1, -1] to [1, 1, 1].
  28   float delta_x = right - left;
  29   float delta_y = top - bottom;
  30   gfx::Transform proj;
  31   if (!delta_x || !delta_y)
  32     return proj;
  33   proj.matrix().set(0, 0, 2.0f / delta_x);
  34   proj.matrix().set(0, 3, -(right + left) / delta_x);
  35   proj.matrix().set(1, 1, 2.0f / delta_y);
  36   proj.matrix().set(1, 3, -(top + bottom) / delta_y);
  37
  38   // Z component of vertices is always set to zero as we don't use the depth
  39   // buffer while drawing.
  40   proj.matrix().set(2, 2, 0);
  41
  42   return proj;
  43 }
  44
  45 static gfx::Transform window_matrix(int x, int y, int width, int height) {
  46   gfx::Transform canvas;
  47
  48   // Map to window position and scale up to pixel coordinates.
  49   canvas.Translate3d(x, y, 0);
  50   canvas.Scale3d(width, height, 0);
  51
  52   // Map from ([-1, -1] to [1, 1]) -> ([0, 0] to [1, 1])
  53   canvas.Translate3d(0.5, 0.5, 0.5);
  54   canvas.Scale3d(0.5, 0.5, 0.5);
  55
  56   return canvas;
  57 }
  58
  59 namespace cc {
  60
  61 DirectRenderer::DrawingFrame::DrawingFrame()
  62     : root_render_pass(NULL), current_render_pass(NULL), current_texture(NULL) {
  63 }
  64
  65 DirectRenderer::DrawingFrame::~DrawingFrame() {}
  66
  67 //
  68 // static
  69 gfx::RectF DirectRenderer::QuadVertexRect() {
  70   return gfx::RectF(-0.5f, -0.5f, 1.f, 1.f);
  71 }
  72
  73 // static
  74 void DirectRenderer::QuadRectTransform(gfx::Transform* quad_rect_transform,
  75                                        const gfx::Transform& quad_transform,
  76                                        const gfx::RectF& quad_rect) {
  77   *quad_rect_transform = quad_transform;
  78   quad_rect_transform->Translate(0.5 * quad_rect.width() + quad_rect.x(),
  79                                  0.5 * quad_rect.height() + quad_rect.y());
  80   quad_rect_transform->Scale(quad_rect.width(), quad_rect.height());
  81 }
  82
  83 void DirectRenderer::InitializeViewport(DrawingFrame* frame,
  84                                         const gfx::Rect& draw_rect,
  85                                         const gfx::Rect& viewport_rect,
  86                                         const gfx::Size& surface_size) {
  87   DCHECK_GE(viewport_rect.x(), 0);
  88   DCHECK_GE(viewport_rect.y(), 0);
  89   DCHECK_LE(viewport_rect.right(), surface_size.width());
  90   DCHECK_LE(viewport_rect.bottom(), surface_size.height());
  91   bool flip_y = FlippedFramebuffer(frame);
  92   if (flip_y) {
  93     frame->projection_matrix = OrthoProjectionMatrix(draw_rect.x(),
  94                                                      draw_rect.right(),
  95                                                      draw_rect.bottom(),
  96                                                      draw_rect.y());
  97   } else {
  98     frame->projection_matrix = OrthoProjectionMatrix(draw_rect.x(),
  99                                                      draw_rect.right(),
 100                                                      draw_rect.y(),
 101                                                      draw_rect.bottom());
 102   }
 103
 104   gfx::Rect window_rect = viewport_rect;
 105   if (flip_y)
 106     window_rect.set_y(surface_size.height() - viewport_rect.bottom());
 107   frame->window_matrix = window_matrix(window_rect.x(),
 108                                        window_rect.y(),
 109                                        window_rect.width(),
 110                                        window_rect.height());
 111   current_draw_rect_ = draw_rect;
 112   current_viewport_rect_ = viewport_rect;
 113   current_surface_size_ = surface_size;
 114   current_window_space_viewport_ = window_rect;
 115 }
 116
 117 gfx::Rect DirectRenderer::MoveFromDrawToWindowSpace(
 118     const DrawingFrame* frame,
 119     const gfx::Rect& draw_rect) const {
 120   gfx::Rect window_rect = draw_rect;
 121   window_rect -= current_draw_rect_.OffsetFromOrigin();
 122   window_rect += current_viewport_rect_.OffsetFromOrigin();
 123   if (FlippedFramebuffer(frame))
 124     window_rect.set_y(current_surface_size_.height() - window_rect.bottom());
 125   return window_rect;
 126 }
 127
 128 DirectRenderer::DirectRenderer(RendererClient* client,
 129                                const RendererSettings* settings,
 130                                OutputSurface* output_surface,
 131                                ResourceProvider* resource_provider)
 132     : Renderer(client, settings),
 133       output_surface_(output_surface),
 134       resource_provider_(resource_provider),
 135       overlay_processor_(
 136           new OverlayProcessor(output_surface, resource_provider)) {
 137   overlay_processor_->Initialize();
 138 }
 139
 140 DirectRenderer::~DirectRenderer() {}
 141
 142 void DirectRenderer::SetEnlargePassTextureAmountForTesting(
 143     const gfx::Vector2d& amount) {
 144   enlarge_pass_texture_amount_ = amount;
 145 }
 146
 147 void DirectRenderer::DecideRenderPassAllocationsForFrame(
 148     const RenderPassList& render_passes_in_draw_order) {
 149   base::hash_map<RenderPassId, gfx::Size> render_passes_in_frame;
 150   for (size_t i = 0; i < render_passes_in_draw_order.size(); ++i)
 151     render_passes_in_frame.insert(std::pair<RenderPassId, gfx::Size>(
 152         render_passes_in_draw_order[i]->id,
 153         RenderPassTextureSize(render_passes_in_draw_order[i])));
 154
 155   std::vector<RenderPassId> passes_to_delete;
 156   base::ScopedPtrHashMap<RenderPassId, ScopedResource>::const_iterator
 157       pass_iter;
 158   for (pass_iter = render_pass_textures_.begin();
 159        pass_iter != render_pass_textures_.end();
 160        ++pass_iter) {
 161     base::hash_map<RenderPassId, gfx::Size>::const_iterator it =
 162         render_passes_in_frame.find(pass_iter->first);
 163     if (it == render_passes_in_frame.end()) {
 164       passes_to_delete.push_back(pass_iter->first);
 165       continue;
 166     }
 167
 168     gfx::Size required_size = it->second;
 169     ScopedResource* texture = pass_iter->second;
 170     DCHECK(texture);
 171
 172     bool size_appropriate = texture->size().width() >= required_size.width() &&
 173                             texture->size().height() >= required_size.height();
 174     if (texture->id() && !size_appropriate)
 175       texture->Free();
 176   }
 177
 178   // Delete RenderPass textures from the previous frame that will not be used
 179   // again.
 180   for (size_t i = 0; i < passes_to_delete.size(); ++i)
 181     render_pass_textures_.erase(passes_to_delete[i]);
 182
 183   for (size_t i = 0; i < render_passes_in_draw_order.size(); ++i) {
 184     if (!render_pass_textures_.contains(render_passes_in_draw_order[i]->id)) {
 185       scoped_ptr<ScopedResource> texture =
 186           ScopedResource::Create(resource_provider_);
 187       render_pass_textures_.set(render_passes_in_draw_order[i]->id,
 188                               texture.Pass());
 189     }
 190   }
 191 }
 192
 193 void DirectRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
 194                                float device_scale_factor,
 195                                const gfx::Rect& device_viewport_rect,
 196                                const gfx::Rect& device_clip_rect,
 197                                bool disable_picture_quad_image_filtering) {
 198   TRACE_EVENT0("cc", "DirectRenderer::DrawFrame");
 199   UMA_HISTOGRAM_COUNTS("Renderer4.renderPassCount",
 200                        render_passes_in_draw_order->size());
 201
 202   const RenderPass* root_render_pass = render_passes_in_draw_order->back();
 203   DCHECK(root_render_pass);
 204
 205   DrawingFrame frame;
 206   frame.render_passes_in_draw_order = render_passes_in_draw_order;
 207   frame.root_render_pass = root_render_pass;
 208   frame.root_damage_rect = Capabilities().using_partial_swap
 209                                ? root_render_pass->damage_rect
 210                                : root_render_pass->output_rect;
 211   frame.root_damage_rect.Intersect(gfx::Rect(device_viewport_rect.size()));
 212   frame.device_viewport_rect = device_viewport_rect;
 213   frame.device_clip_rect = device_clip_rect;
 214   frame.disable_picture_quad_image_filtering =
 215       disable_picture_quad_image_filtering;
 216
 217   if (root_render_pass->copy_requests.empty()) {
 218     // If we have any copy requests, we can't remove any quads for overlays,
 219     // otherwise the framebuffer will be missing the overlay contents.
 220     overlay_processor_->ProcessForOverlays(render_passes_in_draw_order,
 221                                            &frame.overlay_list);
 222   }
 223
 224   EnsureBackbuffer();
 225
 226   // Only reshape when we know we are going to draw. Otherwise, the reshape
 227   // can leave the window at the wrong size if we never draw and the proper
 228   // viewport size is never set.
 229   output_surface_->Reshape(device_viewport_rect.size(), device_scale_factor);
 230
 231   BeginDrawingFrame(&frame);
 232   for (size_t i = 0; i < render_passes_in_draw_order->size(); ++i) {
 233     RenderPass* pass = render_passes_in_draw_order->at(i);
 234     DrawRenderPass(&frame, pass);
 235
 236     for (ScopedPtrVector<CopyOutputRequest>::iterator it =
 237              pass->copy_requests.begin();
 238          it != pass->copy_requests.end();
 239          ++it) {
 240       if (it != pass->copy_requests.begin()) {
 241         // Doing a readback is destructive of our state on Mac, so make sure
 242         // we restore the state between readbacks. http://crbug.com/99393.
 243         UseRenderPass(&frame, pass);
 244       }
 245       CopyCurrentRenderPassToBitmap(&frame, pass->copy_requests.take(it));
 246     }
 247   }
 248   FinishDrawingFrame(&frame);
 249
 250   render_passes_in_draw_order->clear();
 251 }
 252
 253 gfx::Rect DirectRenderer::ComputeScissorRectForRenderPass(
 254     const DrawingFrame* frame) {
 255   gfx::Rect render_pass_scissor = frame->current_render_pass->output_rect;
 256
 257   if (frame->root_damage_rect == frame->root_render_pass->output_rect ||
 258       !frame->current_render_pass->copy_requests.empty())
 259     return render_pass_scissor;
 260
 261   gfx::Transform inverse_transform(gfx::Transform::kSkipInitialization);
 262   if (frame->current_render_pass->transform_to_root_target.GetInverse(
 263           &inverse_transform)) {
 264     // Only intersect inverse-projected damage if the transform is invertible.
 265     gfx::Rect damage_rect_in_render_pass_space =
 266         MathUtil::ProjectEnclosingClippedRect(inverse_transform,
 267                                               frame->root_damage_rect);
 268     render_pass_scissor.Intersect(damage_rect_in_render_pass_space);
 269   }
 270
 271   return render_pass_scissor;
 272 }
 273
 274 bool DirectRenderer::NeedDeviceClip(const DrawingFrame* frame) const {
 275   if (frame->current_render_pass != frame->root_render_pass)
 276     return false;
 277
 278   return !frame->device_clip_rect.Contains(frame->device_viewport_rect);
 279 }
 280
 281 gfx::Rect DirectRenderer::DeviceClipRectInDrawSpace(
 282     const DrawingFrame* frame) const {
 283   gfx::Rect device_clip_rect = frame->device_clip_rect;
 284   device_clip_rect -= current_viewport_rect_.OffsetFromOrigin();
 285   device_clip_rect += current_draw_rect_.OffsetFromOrigin();
 286   return device_clip_rect;
 287 }
 288
 289 gfx::Rect DirectRenderer::DeviceViewportRectInDrawSpace(
 290     const DrawingFrame* frame) const {
 291   gfx::Rect device_viewport_rect = frame->device_viewport_rect;
 292   device_viewport_rect -= current_viewport_rect_.OffsetFromOrigin();
 293   device_viewport_rect += current_draw_rect_.OffsetFromOrigin();
 294   return device_viewport_rect;
 295 }
 296
 297 gfx::Rect DirectRenderer::OutputSurfaceRectInDrawSpace(
 298     const DrawingFrame* frame) const {
 299   if (frame->current_render_pass == frame->root_render_pass) {
 300     gfx::Rect output_surface_rect(output_surface_->SurfaceSize());
 301     output_surface_rect -= current_viewport_rect_.OffsetFromOrigin();
 302     output_surface_rect += current_draw_rect_.OffsetFromOrigin();
 303     return output_surface_rect;
 304   } else {
 305     return frame->current_render_pass->output_rect;
 306   }
 307 }
 308
 309 bool DirectRenderer::ShouldSkipQuad(const DrawQuad& quad,
 310                                     const gfx::Rect& render_pass_scissor) {
 311   if (render_pass_scissor.IsEmpty())
 312     return true;
 313
 314   if (quad.isClipped()) {
 315     gfx::Rect r = quad.clipRect();
 316     r.Intersect(render_pass_scissor);
 317     return r.IsEmpty();
 318   }
 319
 320   return false;
 321 }
 322
 323 void DirectRenderer::SetScissorStateForQuad(
 324     const DrawingFrame* frame,
 325     const DrawQuad& quad,
 326     const gfx::Rect& render_pass_scissor,
 327     bool use_render_pass_scissor) {
 328   if (use_render_pass_scissor) {
 329     gfx::Rect quad_scissor_rect = render_pass_scissor;
 330     if (quad.isClipped())
 331       quad_scissor_rect.Intersect(quad.clipRect());
 332     SetScissorTestRectInDrawSpace(frame, quad_scissor_rect);
 333     return;
 334   } else if (quad.isClipped()) {
 335     SetScissorTestRectInDrawSpace(frame, quad.clipRect());
 336     return;
 337   }
 338
 339   EnsureScissorTestDisabled();
 340 }
 341
 342 void DirectRenderer::SetScissorTestRectInDrawSpace(
 343     const DrawingFrame* frame,
 344     const gfx::Rect& draw_space_rect) {
 345   gfx::Rect window_space_rect =
 346       MoveFromDrawToWindowSpace(frame, draw_space_rect);
 347   SetScissorTestRect(window_space_rect);
 348 }
 349
 350 void DirectRenderer::FinishDrawingQuadList() {}
 351
 352 void DirectRenderer::DoDrawPolygon(const DrawPolygon& poly,
 353                                    DrawingFrame* frame,
 354                                    const gfx::Rect& render_pass_scissor,
 355                                    bool use_render_pass_scissor) {
 356   SetScissorStateForQuad(frame, *poly.original_ref(), render_pass_scissor,
 357                          use_render_pass_scissor);
 358
 359   // If the poly has not been split, then it is just a normal DrawQuad,
 360   // and we should save any extra processing that would have to be done.
 361   if (!poly.is_split()) {
 362     DoDrawQuad(frame, poly.original_ref(), NULL);
 363     return;
 364   }
 365
 366   std::vector<gfx::QuadF> quads;
 367   poly.ToQuads2D(&quads);
 368   for (size_t i = 0; i < quads.size(); ++i) {
 369     DoDrawQuad(frame, poly.original_ref(), &quads[i]);
 370   }
 371 }
 372
 373 void DirectRenderer::FlushPolygons(ScopedPtrDeque<DrawPolygon>* poly_list,
 374                                    DrawingFrame* frame,
 375                                    const gfx::Rect& render_pass_scissor,
 376                                    bool use_render_pass_scissor) {
 377   if (poly_list->empty()) {
 378     return;
 379   }
 380
 381   BspTree bsp_tree(poly_list);
 382   BspWalkActionDrawPolygon action_handler(this, frame, render_pass_scissor,
 383                                           use_render_pass_scissor);
 384   bsp_tree.TraverseWithActionHandler(&action_handler);
 385   DCHECK(poly_list->empty());
 386 }
 387
 388 void DirectRenderer::DrawRenderPass(DrawingFrame* frame,
 389                                     const RenderPass* render_pass) {
 390   TRACE_EVENT0("cc", "DirectRenderer::DrawRenderPass");
 391   if (!UseRenderPass(frame, render_pass))
 392     return;
 393
 394   const gfx::Rect surface_rect_in_draw_space =
 395       OutputSurfaceRectInDrawSpace(frame);
 396   gfx::Rect render_pass_scissor_in_draw_space = surface_rect_in_draw_space;
 397
 398   if (frame->current_render_pass == frame->root_render_pass) {
 399     render_pass_scissor_in_draw_space.Intersect(
 400         DeviceViewportRectInDrawSpace(frame));
 401   }
 402
 403   if (Capabilities().using_partial_swap) {
 404     render_pass_scissor_in_draw_space.Intersect(
 405         ComputeScissorRectForRenderPass(frame));
 406   }
 407
 408   if (NeedDeviceClip(frame)) {
 409     render_pass_scissor_in_draw_space.Intersect(
 410         DeviceClipRectInDrawSpace(frame));
 411   }
 412
 413   bool render_pass_is_clipped =
 414       !render_pass_scissor_in_draw_space.Contains(surface_rect_in_draw_space);
 415   bool is_root_render_pass =
 416       frame->current_render_pass == frame->root_render_pass;
 417   bool has_external_stencil_test =
 418       is_root_render_pass && output_surface_->HasExternalStencilTest();
 419   bool should_clear_surface =
 420       !has_external_stencil_test &&
 421       (!is_root_render_pass || settings_->should_clear_root_render_pass);
 422
 423   // If |has_external_stencil_test| we can't discard or clear. Make sure we
 424   // don't need to.
 425   DCHECK_IMPLIES(has_external_stencil_test,
 426                  !frame->current_render_pass->has_transparent_background);
 427
 428   SurfaceInitializationMode mode;
 429   if (should_clear_surface && render_pass_is_clipped) {
 430     mode = SURFACE_INITIALIZATION_MODE_SCISSORED_CLEAR;
 431   } else if (should_clear_surface) {
 432     mode = SURFACE_INITIALIZATION_MODE_FULL_SURFACE_CLEAR;
 433   } else {
 434     mode = SURFACE_INITIALIZATION_MODE_PRESERVE;
 435   }
 436
 437   PrepareSurfaceForPass(
 438       frame, mode,
 439       MoveFromDrawToWindowSpace(frame, render_pass_scissor_in_draw_space));
 440
 441   const QuadList& quad_list = render_pass->quad_list;
 442   ScopedPtrDeque<DrawPolygon> poly_list;
 443
 444   int next_polygon_id = 0;
 445   int last_sorting_context_id = 0;
 446   for (auto it = quad_list.BackToFrontBegin(); it != quad_list.BackToFrontEnd();
 447        ++it) {
 448     const DrawQuad& quad = **it;
 449     gfx::QuadF send_quad(quad.visible_rect);
 450
 451     if (render_pass_is_clipped &&
 452         ShouldSkipQuad(quad, render_pass_scissor_in_draw_space)) {
 453       continue;
 454     }
 455
 456     if (last_sorting_context_id != quad.shared_quad_state->sorting_context_id) {
 457       last_sorting_context_id = quad.shared_quad_state->sorting_context_id;
 458       FlushPolygons(&poly_list, frame, render_pass_scissor_in_draw_space,
 459                     render_pass_is_clipped);
 460     }
 461
 462     // This layer is in a 3D sorting context so we add it to the list of
 463     // polygons to go into the BSP tree.
 464     if (quad.shared_quad_state->sorting_context_id != 0) {
 465       scoped_ptr<DrawPolygon> new_polygon(new DrawPolygon(
 466           *it, quad.visible_rect, quad.quadTransform(), next_polygon_id++));
 467       if (new_polygon->points().size() > 2u) {
 468         poly_list.push_back(new_polygon.Pass());
 469       }
 470       continue;
 471     }
 472
 473     // We are not in a 3d sorting context, so we should draw the quad normally.
 474     SetScissorStateForQuad(frame, quad, render_pass_scissor_in_draw_space,
 475                            render_pass_is_clipped);
 476
 477     DoDrawQuad(frame, &quad, nullptr);
 478   }
 479   FlushPolygons(&poly_list, frame, render_pass_scissor_in_draw_space,
 480                 render_pass_is_clipped);
 481   FinishDrawingQuadList();
 482 }
 483
 484 bool DirectRenderer::UseRenderPass(DrawingFrame* frame,
 485                                    const RenderPass* render_pass) {
 486   frame->current_render_pass = render_pass;
 487   frame->current_texture = NULL;
 488   if (render_pass == frame->root_render_pass) {
 489     BindFramebufferToOutputSurface(frame);
 490     InitializeViewport(frame,
 491                        render_pass->output_rect,
 492                        frame->device_viewport_rect,
 493                        output_surface_->SurfaceSize());
 494     return true;
 495   }
 496
 497   ScopedResource* texture = render_pass_textures_.get(render_pass->id);
 498   DCHECK(texture);
 499
 500   gfx::Size size = RenderPassTextureSize(render_pass);
 501   size.Enlarge(enlarge_pass_texture_amount_.x(),
 502                enlarge_pass_texture_amount_.y());
 503   if (!texture->id()) {
 504     texture->Allocate(
 505         size, ResourceProvider::TEXTURE_HINT_IMMUTABLE_FRAMEBUFFER, RGBA_8888);
 506   }
 507   DCHECK(texture->id());
 508
 509   if (BindFramebufferToTexture(frame, texture, render_pass->output_rect)) {
 510     InitializeViewport(frame, render_pass->output_rect,
 511                        gfx::Rect(render_pass->output_rect.size()),
 512                        render_pass->output_rect.size());
 513     return true;
 514   }
 515
 516   return false;
 517 }
 518
 519 bool DirectRenderer::HasAllocatedResourcesForTesting(RenderPassId id) const {
 520   ScopedResource* texture = render_pass_textures_.get(id);
 521   return texture && texture->id();
 522 }
 523
 524 // static
 525 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
 526   return render_pass->output_rect.size();
 527 }
 528
 529 }  // namespace cc