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/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),
  61       current_render_pass(NULL),
  62       current_texture(NULL),
  63       offscreen_context_provider(NULL) {}
  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                                         gfx::Size surface_size) {
  87   bool flip_y = FlippedFramebuffer();
  88
  89   DCHECK_GE(viewport_rect.x(), 0);
  90   DCHECK_GE(viewport_rect.y(), 0);
  91   DCHECK_LE(viewport_rect.right(), surface_size.width());
  92   DCHECK_LE(viewport_rect.bottom(), surface_size.height());
  93   if (flip_y) {
  94     frame->projection_matrix = OrthoProjectionMatrix(draw_rect.x(),
  95                                                      draw_rect.right(),
  96                                                      draw_rect.bottom(),
  97                                                      draw_rect.y());
  98   } else {
  99     frame->projection_matrix = OrthoProjectionMatrix(draw_rect.x(),
 100                                                      draw_rect.right(),
 101                                                      draw_rect.y(),
 102                                                      draw_rect.bottom());
 103   }
 104
 105   gfx::Rect window_rect = viewport_rect;
 106   if (flip_y)
 107     window_rect.set_y(surface_size.height() - viewport_rect.bottom());
 108   frame->window_matrix = window_matrix(window_rect.x(),
 109                                        window_rect.y(),
 110                                        window_rect.width(),
 111                                        window_rect.height());
 112   SetDrawViewport(window_rect);
 113
 114   current_draw_rect_ = draw_rect;
 115   current_viewport_rect_ = viewport_rect;
 116   current_surface_size_ = surface_size;
 117 }
 118
 119 gfx::Rect DirectRenderer::MoveFromDrawToWindowSpace(
 120     const gfx::RectF& draw_rect) const {
 121   gfx::Rect window_rect = gfx::ToEnclosingRect(draw_rect);
 122   window_rect -= current_draw_rect_.OffsetFromOrigin();
 123   window_rect += current_viewport_rect_.OffsetFromOrigin();
 124   if (FlippedFramebuffer())
 125     window_rect.set_y(current_surface_size_.height() - window_rect.bottom());
 126   return window_rect;
 127 }
 128
 129 DirectRenderer::DirectRenderer(RendererClient* client,
 130                                const LayerTreeSettings* settings,
 131                                OutputSurface* output_surface,
 132                                ResourceProvider* resource_provider)
 133     : Renderer(client, settings),
 134       output_surface_(output_surface),
 135       resource_provider_(resource_provider) {}
 136
 137 DirectRenderer::~DirectRenderer() {}
 138
 139 bool DirectRenderer::CanReadPixels() const { return true; }
 140
 141 void DirectRenderer::SetEnlargePassTextureAmountForTesting(
 142     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<RenderPass::Id, 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<RenderPass::Id, gfx::Size>(
 154         render_passes_in_draw_order[i]->id,
 155         RenderPassTextureSize(render_passes_in_draw_order[i])));
 156
 157   std::vector<RenderPass::Id> passes_to_delete;
 158   base::ScopedPtrHashMap<RenderPass::Id, 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<RenderPass::Id, 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                                ContextProvider* offscreen_context_provider,
 197                                float device_scale_factor,
 198                                const gfx::Rect& device_viewport_rect,
 199                                const gfx::Rect& device_clip_rect,
 200                                bool allow_partial_swap,
 201                                bool disable_picture_quad_image_filtering) {
 202   TRACE_EVENT0("cc", "DirectRenderer::DrawFrame");
 203   UMA_HISTOGRAM_COUNTS("Renderer4.renderPassCount",
 204                        render_passes_in_draw_order->size());
 205
 206   const RenderPass* root_render_pass = render_passes_in_draw_order->back();
 207   DCHECK(root_render_pass);
 208
 209   DrawingFrame frame;
 210   frame.root_render_pass = root_render_pass;
 211   frame.root_damage_rect =
 212       Capabilities().using_partial_swap && allow_partial_swap
 213           ? root_render_pass->damage_rect
 214           : root_render_pass->output_rect;
 215   frame.root_damage_rect.Intersect(gfx::Rect(device_viewport_rect.size()));
 216   frame.device_viewport_rect = device_viewport_rect;
 217   frame.device_clip_rect = device_clip_rect;
 218   frame.offscreen_context_provider = offscreen_context_provider;
 219   frame.disable_picture_quad_image_filtering =
 220       disable_picture_quad_image_filtering;
 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, allow_partial_swap);
 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::RectF DirectRenderer::ComputeScissorRectForRenderPass(
 252     const DrawingFrame* frame) {
 253   gfx::RectF render_pass_scissor = frame->current_render_pass->output_rect;
 254
 255   if (frame->root_damage_rect == frame->root_render_pass->output_rect)
 256     return render_pass_scissor;
 257
 258   gfx::Transform inverse_transform(gfx::Transform::kSkipInitialization);
 259   if (frame->current_render_pass->transform_to_root_target.GetInverse(
 260           &inverse_transform)) {
 261     // Only intersect inverse-projected damage if the transform is invertible.
 262     gfx::RectF damage_rect_in_render_pass_space =
 263         MathUtil::ProjectClippedRect(inverse_transform,
 264                                      frame->root_damage_rect);
 265     render_pass_scissor.Intersect(damage_rect_in_render_pass_space);
 266   }
 267
 268   return render_pass_scissor;
 269 }
 270
 271 bool DirectRenderer::NeedDeviceClip(const DrawingFrame* frame) const {
 272   if (frame->current_render_pass != frame->root_render_pass)
 273     return false;
 274
 275   return !frame->device_clip_rect.Contains(frame->device_viewport_rect);
 276 }
 277
 278 gfx::Rect DirectRenderer::DeviceClipRectInWindowSpace(const DrawingFrame* frame)
 279     const {
 280   gfx::Rect device_clip_rect = frame->device_clip_rect;
 281   if (FlippedFramebuffer())
 282     device_clip_rect.set_y(current_surface_size_.height() -
 283                            device_clip_rect.bottom());
 284   return device_clip_rect;
 285 }
 286
 287 void DirectRenderer::SetScissorStateForQuad(const DrawingFrame* frame,
 288                                             const DrawQuad& quad) {
 289   if (quad.isClipped()) {
 290     SetScissorTestRectInDrawSpace(frame, quad.clipRect());
 291     return;
 292   }
 293   if (NeedDeviceClip(frame)) {
 294     SetScissorTestRect(DeviceClipRectInWindowSpace(frame));
 295     return;
 296   }
 297
 298   EnsureScissorTestDisabled();
 299 }
 300
 301 void DirectRenderer::SetScissorStateForQuadWithRenderPassScissor(
 302     const DrawingFrame* frame,
 303     const DrawQuad& quad,
 304     const gfx::RectF& render_pass_scissor,
 305     bool* should_skip_quad) {
 306   gfx::RectF quad_scissor_rect = render_pass_scissor;
 307
 308   if (quad.isClipped())
 309     quad_scissor_rect.Intersect(quad.clipRect());
 310
 311   if (quad_scissor_rect.IsEmpty()) {
 312     *should_skip_quad = true;
 313     return;
 314   }
 315
 316   *should_skip_quad = false;
 317   SetScissorTestRectInDrawSpace(frame, quad_scissor_rect);
 318 }
 319
 320 void DirectRenderer::SetScissorTestRectInDrawSpace(
 321     const DrawingFrame* frame,
 322     const gfx::RectF& draw_space_rect) {
 323   gfx::Rect window_space_rect = MoveFromDrawToWindowSpace(draw_space_rect);
 324   if (NeedDeviceClip(frame))
 325     window_space_rect.Intersect(DeviceClipRectInWindowSpace(frame));
 326   SetScissorTestRect(window_space_rect);
 327 }
 328
 329 void DirectRenderer::FinishDrawingQuadList() {}
 330
 331 void DirectRenderer::DrawRenderPass(DrawingFrame* frame,
 332                                     const RenderPass* render_pass,
 333                                     bool allow_partial_swap) {
 334   TRACE_EVENT0("cc", "DirectRenderer::DrawRenderPass");
 335   if (!UseRenderPass(frame, render_pass))
 336     return;
 337
 338   bool using_scissor_as_optimization =
 339       Capabilities().using_partial_swap && allow_partial_swap;
 340   gfx::RectF render_pass_scissor;
 341   bool draw_rect_covers_full_surface = true;
 342   if (frame->current_render_pass == frame->root_render_pass &&
 343       !frame->device_viewport_rect.Contains(
 344            gfx::Rect(output_surface_->SurfaceSize())))
 345     draw_rect_covers_full_surface = false;
 346
 347   if (using_scissor_as_optimization) {
 348     render_pass_scissor = ComputeScissorRectForRenderPass(frame);
 349     SetScissorTestRectInDrawSpace(frame, render_pass_scissor);
 350     if (!render_pass_scissor.Contains(frame->current_render_pass->output_rect))
 351       draw_rect_covers_full_surface = false;
 352   }
 353
 354   if (frame->current_render_pass != frame->root_render_pass ||
 355       settings_->should_clear_root_render_pass) {
 356     if (NeedDeviceClip(frame)) {
 357       SetScissorTestRect(DeviceClipRectInWindowSpace(frame));
 358       draw_rect_covers_full_surface = false;
 359     } else if (!using_scissor_as_optimization) {
 360       EnsureScissorTestDisabled();
 361     }
 362
 363     bool has_external_stencil_test =
 364         output_surface_->HasExternalStencilTest() &&
 365         frame->current_render_pass == frame->root_render_pass;
 366
 367     DiscardPixels(has_external_stencil_test, draw_rect_covers_full_surface);
 368     ClearFramebuffer(frame, has_external_stencil_test);
 369   }
 370
 371   const QuadList& quad_list = render_pass->quad_list;
 372   for (QuadList::ConstBackToFrontIterator it = quad_list.BackToFrontBegin();
 373        it != quad_list.BackToFrontEnd();
 374        ++it) {
 375     const DrawQuad& quad = *(*it);
 376     bool should_skip_quad = false;
 377
 378     if (using_scissor_as_optimization) {
 379       SetScissorStateForQuadWithRenderPassScissor(
 380           frame, quad, render_pass_scissor, &should_skip_quad);
 381     } else {
 382       SetScissorStateForQuad(frame, quad);
 383     }
 384
 385     if (!should_skip_quad)
 386       DoDrawQuad(frame, *it);
 387   }
 388   FinishDrawingQuadList();
 389 }
 390
 391 bool DirectRenderer::UseRenderPass(DrawingFrame* frame,
 392                                    const RenderPass* render_pass) {
 393   frame->current_render_pass = render_pass;
 394   frame->current_texture = NULL;
 395
 396   if (render_pass == frame->root_render_pass) {
 397     BindFramebufferToOutputSurface(frame);
 398     InitializeViewport(frame,
 399                        render_pass->output_rect,
 400                        frame->device_viewport_rect,
 401                        output_surface_->SurfaceSize());
 402     return true;
 403   }
 404
 405   ScopedResource* texture = render_pass_textures_.get(render_pass->id);
 406   DCHECK(texture);
 407
 408   gfx::Size size = RenderPassTextureSize(render_pass);
 409   size.Enlarge(enlarge_pass_texture_amount_.x(),
 410                enlarge_pass_texture_amount_.y());
 411   if (!texture->id())
 412     texture->Allocate(
 413         size, ResourceProvider::TextureUsageFramebuffer, RGBA_8888);
 414   DCHECK(texture->id());
 415
 416   return BindFramebufferToTexture(frame, texture, render_pass->output_rect);
 417 }
 418
 419 bool DirectRenderer::HasAllocatedResourcesForTesting(RenderPass::Id id)
 420     const {
 421   ScopedResource* texture = render_pass_textures_.get(id);
 422   return texture && texture->id();
 423 }
 424
 425 // static
 426 gfx::Size DirectRenderer::RenderPassTextureSize(const RenderPass* render_pass) {
 427   return render_pass->output_rect.size();
 428 }
 429
 430 }  // namespace cc