src/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/debug/trace_event.h"
  13 #include "base/metrics/histogram.h"
  14 #include "cc/base/math_util.h"
  15 #include "cc/output/copy_output_request.h"
  16 #include "cc/quads/draw_quad.h"
  17 #include "ui/gfx/geometry/rect_conversions.h"
  18 #include "ui/gfx/transform.h"
  19
  20 static gfx::Transform OrthoProjectionMatrix(float left,
  21                                             float right,
  22                                             float bottom,
  23                                             float top) {
  24   // Use the standard formula to map the clipping frustum to the cube from
  25   // [-1, -1, -1] to [1, 1, 1].
  26   float delta_x = right - left;
  27   float delta_y = top - bottom;
  28   gfx::Transform proj;
  29   if (!delta_x || !delta_y)
  30     return proj;
  31   proj.matrix().set(0, 0, 2.0f / delta_x);
  32   proj.matrix().set(0, 3, -(right + left) / delta_x);
  33   proj.matrix().set(1, 1, 2.0f / delta_y);
  34   proj.matrix().set(1, 3, -(top + bottom) / delta_y);
  35
  36   // Z component of vertices is always set to zero as we don't use the depth
  37   // buffer while drawing.
  38   proj.matrix().set(2, 2, 0);
  39
  40   return proj;
  41 }
  42
  43 static gfx::Transform window_matrix(int x, int y, int width, int height) {
  44   gfx::Transform canvas;
  45
  46   // Map to window position and scale up to pixel coordinates.
  47   canvas.Translate3d(x, y, 0);
  48   canvas.Scale3d(width, height, 0);
  49
  50   // Map from ([-1, -1] to [1, 1]) -> ([0, 0] to [1, 1])
  51   canvas.Translate3d(0.5, 0.5, 0.5);
  52   canvas.Scale3d(0.5, 0.5, 0.5);
  53
  54   return canvas;
  55 }
  56
  57 namespace cc {
  58
  59 DirectRenderer::DrawingFrame::DrawingFrame()
  60     : root_render_pass(NULL), current_render_pass(NULL), current_texture(NULL) {
  61 }
  62
  63 DirectRenderer::DrawingFrame::~DrawingFrame() {}
  64
  65 //
  66 // static
  67 gfx::RectF DirectRenderer::QuadVertexRect() {
  68   return gfx::RectF(-0.5f, -0.5f, 1.f, 1.f);
  69 }
  70
  71 // static
  72 void DirectRenderer::QuadRectTransform(gfx::Transform* quad_rect_transform,
  73                                        const gfx::Transform& quad_transform,
  74                                        const gfx::RectF& quad_rect) {
  75   *quad_rect_transform = quad_transform;
  76   quad_rect_transform->Translate(0.5 * quad_rect.width() + quad_rect.x(),
  77                                  0.5 * quad_rect.height() + quad_rect.y());
  78   quad_rect_transform->Scale(quad_rect.width(), quad_rect.height());
  79 }
  80
  81 void DirectRenderer::InitializeViewport(DrawingFrame* frame,
  82                                         const gfx::Rect& draw_rect,
  83                                         const gfx::Rect& viewport_rect,
  84                                         const gfx::Size& surface_size) {
  85   bool flip_y = FlippedFramebuffer();
  86
  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   if (flip_y) {
  92     frame->projection_matrix = OrthoProjectionMatrix(draw_rect.x(),
  93                                                      draw_rect.right(),
  94                                                      draw_rect.bottom(),
  95                                                      draw_rect.y());
  96   } else {
  97     frame->projection_matrix = OrthoProjectionMatrix(draw_rect.x(),
  98                                                      draw_rect.right(),
  99                                                      draw_rect.y(),
 100                                                      draw_rect.bottom());
 101   }
 102
 103   gfx::Rect window_rect = viewport_rect;
 104   if (flip_y)
 105     window_rect.set_y(surface_size.height() - viewport_rect.bottom());
 106   frame->window_matrix = window_matrix(window_rect.x(),
 107                                        window_rect.y(),
 108                                        window_rect.width(),
 109                                        window_rect.height());
 110   SetDrawViewport(window_rect);
 111
 112   current_draw_rect_ = draw_rect;
 113   current_viewport_rect_ = viewport_rect;
 114   current_surface_size_ = surface_size;
 115 }
 116
 117 gfx::Rect DirectRenderer::MoveFromDrawToWindowSpace(
 118     const gfx::Rect& draw_rect) const {
 119   gfx::Rect window_rect = draw_rect;
 120   window_rect -= current_draw_rect_.OffsetFromOrigin();
 121   window_rect += current_viewport_rect_.OffsetFromOrigin();
 122   if (FlippedFramebuffer())
 123     window_rect.set_y(current_surface_size_.height() - window_rect.bottom());
 124   return window_rect;
 125 }
 126
 127 DirectRenderer::DirectRenderer(RendererClient* client,
 128                                const LayerTreeSettings* settings,
 129                                OutputSurface* output_surface,
 130                                ResourceProvider* resource_provider)
 131     : Renderer(client, settings),
 132       output_surface_(output_surface),
 133       resource_provider_(resource_provider),
 134       overlay_processor_(
 135           new OverlayProcessor(output_surface, resource_provider)) {
 136   overlay_processor_->Initialize();
 137 }
 138
 139 DirectRenderer::~DirectRenderer() {}
 140
 141 void DirectRenderer::SetEnlargePassTextureAmountForTesting(
 142     const gfx::Vector2d& amount) {
 143   enlarge_pass_texture_amount_ = amount;
 144 }
 145
 146 void DirectRenderer::DecideRenderPassAllocationsForFrame(
 147     const RenderPassList& render_passes_in_draw_order) {
 148   if (!resource_provider_)
 149     return;
 150
 151   base::hash_map<RenderPassId, gfx::Size> render_passes_in_frame;
 152   for (size_t i = 0; i < render_passes_in_draw_order.size(); ++i)
 153     render_passes_in_frame.insert(std::pair<RenderPassId, gfx::Size>(
 154         render_passes_in_draw_order[i]->id,
 155         RenderPassTextureSize(render_passes_in_draw_order[i])));
 156
 157   std::vector<RenderPassId> passes_to_delete;
 158   base::ScopedPtrHashMap<RenderPassId, ScopedResource>::const_iterator
 159       pass_iter;
 160   for (pass_iter = render_pass_textures_.begin();
 161        pass_iter != render_pass_textures_.end();
 162        ++pass_iter) {
 163     base::hash_map<RenderPassId, gfx::Size>::const_iterator it =
 164         render_passes_in_frame.find(pass_iter->first);
 165     if (it == render_passes_in_frame.end()) {
 166       passes_to_delete.push_back(pass_iter->first);
 167       continue;
 168     }
 169
 170     gfx::Size required_size = it->second;
 171     ScopedResource* texture = pass_iter->second;
 172     DCHECK(texture);
 173
 174     bool size_appropriate = texture->size().width() >= required_size.width() &&
 175                             texture->size().height() >= required_size.height();
 176     if (texture->id() && !size_appropriate)
 177       texture->Free();
 178   }
 179
 180   // Delete RenderPass textures from the previous frame that will not be used
 181   // again.
 182   for (size_t i = 0; i < passes_to_delete.size(); ++i)
 183     render_pass_textures_.erase(passes_to_delete[i]);
 184
 185   for (size_t i = 0; i < render_passes_in_draw_order.size(); ++i) {
 186     if (!render_pass_textures_.contains(render_passes_in_draw_order[i]->id)) {
 187       scoped_ptr<ScopedResource> texture =
 188           ScopedResource::Create(resource_provider_);
 189       render_pass_textures_.set(render_passes_in_draw_order[i]->id,
 190                               texture.Pass());
 191     }
 192   }
 193 }
 194
 195 void DirectRenderer::DrawFrame(RenderPassList* render_passes_in_draw_order,
 196                                float device_scale_factor,
 197                                const gfx::Rect& device_viewport_rect,
 198                                const gfx::Rect& device_clip_rect,
 199                                bool disable_picture_quad_image_filtering) {
 200   TRACE_EVENT0("cc", "DirectRenderer::DrawFrame");
 201   UMA_HISTOGRAM_COUNTS("Renderer4.renderPassCount",
 202                        render_passes_in_draw_order->size());
 203
 204   const RenderPass* root_render_pass = render_passes_in_draw_order->back();
 205   DCHECK(root_render_pass);
 206
 207   DrawingFrame frame;
 208   frame.render_passes_in_draw_order = render_passes_in_draw_order;
 209   frame.root_render_pass = root_render_pass;
 210   frame.root_damage_rect = Capabilities().using_partial_swap
 211                                ? root_render_pass->damage_rect
 212                                : root_render_pass->output_rect;
 213   frame.root_damage_rect.Intersect(gfx::Rect(device_viewport_rect.size()));
 214   frame.device_viewport_rect = device_viewport_rect;
 215   frame.device_clip_rect = device_clip_rect;
 216   frame.disable_picture_quad_image_filtering =
 217       disable_picture_quad_image_filtering;
 218
 219   overlay_processor_->ProcessForOverlays(render_passes_in_draw_order,
 220                                          &frame.overlay_list);
 221
 222   EnsureBackbuffer();
 223
 224   // Only reshape when we know we are going to draw. Otherwise, the reshape
 225   // can leave the window at the wrong size if we never draw and the proper
 226   // viewport size is never set.
 227   output_surface_->Reshape(device_viewport_rect.size(), device_scale_factor);
 228
 229   BeginDrawingFrame(&frame);
 230   for (size_t i = 0; i < render_passes_in_draw_order->size(); ++i) {
 231     RenderPass* pass = render_passes_in_draw_order->at(i);
 232     DrawRenderPass(&frame, pass);
 233
 234     for (ScopedPtrVector<CopyOutputRequest>::iterator it =
 235              pass->copy_requests.begin();
 236          it != pass->copy_requests.end();
 237          ++it) {
 238       if (i > 0) {
 239         // Doing a readback is destructive of our state on Mac, so make sure
 240         // we restore the state between readbacks. http://crbug.com/99393.
 241         UseRenderPass(&frame, pass);
 242       }
 243       CopyCurrentRenderPassToBitmap(&frame, pass->copy_requests.take(it));
 244     }
 245   }
 246   FinishDrawingFrame(&frame);
 247
 248   render_passes_in_draw_order->clear();
 249 }
 250
 251 gfx::Rect DirectRenderer::ComputeScissorRectForRenderPass(
 252     const DrawingFrame* frame) {
 253   gfx::Rect render_pass_scissor = frame->current_render_pass->output_rect;
 254
 255   if (frame->root_damage_rect == frame->root_render_pass->output_rect ||
 256       !frame->current_render_pass->copy_requests.empty())
 257     return render_pass_scissor;
 258
 259   gfx::Transform inverse_transform(gfx::Transform::kSkipInitialization);
 260   if (frame->current_render_pass->transform_to_root_target.GetInverse(
 261           &inverse_transform)) {
 262     // Only intersect inverse-projected damage if the transform is invertible.
 263     gfx::Rect damage_rect_in_render_pass_space =
 264         MathUtil::ProjectEnclosingClippedRect(inverse_transform,
 265                                               frame->root_damage_rect);
 266     render_pass_scissor.Intersect(damage_rect_in_render_pass_space);
 267   }
 268
 269   return render_pass_scissor;
 270 }
 271
 272 bool DirectRenderer::NeedDeviceClip(const DrawingFrame* frame) const {
 273   if (frame->current_render_pass != frame->root_render_pass)
 274     return false;
 275
 276   return !frame->device_clip_rect.Contains(frame->device_viewport_rect);
 277 }
 278
 279 gfx::Rect DirectRenderer::DeviceClipRectInWindowSpace(const DrawingFrame* frame)
 280     const {
 281   gfx::Rect device_clip_rect = frame->device_clip_rect;
 282   if (FlippedFramebuffer())
 283     device_clip_rect.set_y(current_surface_size_.height() -
 284                            device_clip_rect.bottom());
 285   return device_clip_rect;
 286 }
 287
 288 void DirectRenderer::SetScissorStateForQuad(const DrawingFrame* frame,
 289                                             const DrawQuad& quad) {
 290   if (quad.isClipped()) {
 291     SetScissorTestRectInDrawSpace(frame, quad.clipRect());
 292     return;
 293   }
 294   if (NeedDeviceClip(frame)) {
 295     SetScissorTestRect(DeviceClipRectInWindowSpace(frame));
 296     return;
 297   }
 298
 299   EnsureScissorTestDisabled();
 300 }
 301
 302 void DirectRenderer::SetScissorStateForQuadWithRenderPassScissor(
 303     const DrawingFrame* frame,
 304     const DrawQuad& quad,
 305     const gfx::Rect& render_pass_scissor,
 306     bool* should_skip_quad) {
 307   gfx::Rect quad_scissor_rect = render_pass_scissor;
 308
 309   if (quad.isClipped())
 310     quad_scissor_rect.Intersect(quad.clipRect());
 311
 312   if (quad_scissor_rect.IsEmpty()) {
 313     *should_skip_quad = true;
 314     return;
 315   }
 316
 317   *should_skip_quad = false;
 318   SetScissorTestRectInDrawSpace(frame, quad_scissor_rect);
 319 }
 320
 321 void DirectRenderer::SetScissorTestRectInDrawSpace(
 322     const DrawingFrame* frame,
 323     const gfx::Rect& draw_space_rect) {
 324   gfx::Rect window_space_rect = MoveFromDrawToWindowSpace(draw_space_rect);
 325   if (NeedDeviceClip(frame))
 326     window_space_rect.Intersect(DeviceClipRectInWindowSpace(frame));
 327   SetScissorTestRect(window_space_rect);
 328 }
 329
 330 void DirectRenderer::FinishDrawingQuadList() {}
 331
 332 void DirectRenderer::DrawRenderPass(DrawingFrame* frame,
 333                                     const RenderPass* render_pass) {
 334   TRACE_EVENT0("cc", "DirectRenderer::DrawRenderPass");
 335   if (!UseRenderPass(frame, render_pass))
 336     return;
 337
 338   bool using_scissor_as_optimization = Capabilities().using_partial_swap;
 339   gfx::Rect render_pass_scissor;
 340   bool draw_rect_covers_full_surface = true;
 341   if (frame->current_render_pass == frame->root_render_pass &&
 342       !frame->device_viewport_rect.Contains(
 343            gfx::Rect(output_surface_->SurfaceSize())))
 344     draw_rect_covers_full_surface = false;
 345
 346   if (using_scissor_as_optimization) {
 347     render_pass_scissor = ComputeScissorRectForRenderPass(frame);
 348     SetScissorTestRectInDrawSpace(frame, render_pass_scissor);
 349     if (!render_pass_scissor.Contains(frame->current_render_pass->output_rect))
 350       draw_rect_covers_full_surface = false;
 351   }
 352
 353   if (frame->current_render_pass != frame->root_render_pass ||
 354       settings_->should_clear_root_render_pass) {
 355     if (NeedDeviceClip(frame)) {
 356       SetScissorTestRect(DeviceClipRectInWindowSpace(frame));
 357       draw_rect_covers_full_surface = false;
 358     } else if (!using_scissor_as_optimization) {
 359       EnsureScissorTestDisabled();
 360     }
 361
 362     bool has_external_stencil_test =
 363         output_surface_->HasExternalStencilTest() &&
 364         frame->current_render_pass == frame->root_render_pass;
 365
 366     DiscardPixels(has_external_stencil_test, draw_rect_covers_full_surface);
 367     ClearFramebuffer(frame, has_external_stencil_test);
 368   }
 369
 370   const QuadList& quad_list = render_pass->quad_list;
 371   for (QuadList::ConstBackToFrontIterator it = quad_list.BackToFrontBegin();
 372        it != quad_list.BackToFrontEnd();
 373        ++it) {
 374     const DrawQuad& quad = *it;
 375     bool should_skip_quad = false;
 376
 377     if (using_scissor_as_optimization) {
 378       SetScissorStateForQuadWithRenderPassScissor(
 379           frame, quad, render_pass_scissor, &should_skip_quad);
 380     } else {
 381       SetScissorStateForQuad(frame, quad);
 382     }
 383
 384     if (!should_skip_quad)
 385       DoDrawQuad(frame, &quad);
 386   }
 387   FinishDrawingQuadList();
 388 }
 389
 390 bool DirectRenderer::UseRenderPass(DrawingFrame* frame,
 391                                    const RenderPass* render_pass) {
 392   frame->current_render_pass = render_pass;
 393   frame->current_texture = NULL;
 394
 395   if (render_pass == frame->root_render_pass) {
 396     BindFramebufferToOutputSurface(frame);
 397     InitializeViewport(frame,
 398                        render_pass->output_rect,
 399                        frame->device_viewport_rect,
 400                        output_surface_->SurfaceSize());
 401     return true;
 402   }
 403
 404   ScopedResource* texture = render_pass_textures_.get(render_pass->id);
 405   DCHECK(texture);
 406
 407   gfx::Size size = RenderPassTextureSize(render_pass);
 408   size.Enlarge(enlarge_pass_texture_amount_.x(),
 409                enlarge_pass_texture_amount_.y());
 410   if (!texture->id())
 411     texture->Allocate(
 412         size, ResourceProvider::TextureHintImmutableFramebuffer, RGBA_8888);
 413   DCHECK(texture->id());
 414
 415   return BindFramebufferToTexture(frame, texture, render_pass->output_rect);
 416 }
 417
 418 bool DirectRenderer::HasAllocatedResourcesForTesting(RenderPassId id) const {
 419   ScopedResource* texture = render_pass_textures_.get(id);
 420   return texture && texture->id();
 421 }
 422
 423 // static
 424 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
 425   return render_pass->output_rect.size();
 426 }
 427
 428 }  // namespace cc