cc/layers/heads_up_display_layer_impl.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/layers/heads_up_display_layer_impl.h"
   6
   7 #include <algorithm>
   8 #include <vector>
   9
  10 #include "base/strings/string_split.h"
  11 #include "base/strings/stringprintf.h"
  12 #include "cc/debug/debug_colors.h"
  13 #include "cc/debug/debug_rect_history.h"
  14 #include "cc/debug/frame_rate_counter.h"
  15 #include "cc/debug/paint_time_counter.h"
  16 #include "cc/layers/quad_sink.h"
  17 #include "cc/output/renderer.h"
  18 #include "cc/quads/texture_draw_quad.h"
  19 #include "cc/resources/memory_history.h"
  20 #include "cc/resources/tile_manager.h"
  21 #include "cc/trees/layer_tree_impl.h"
  22 #include "skia/ext/platform_canvas.h"
  23 #include "third_party/khronos/GLES2/gl2.h"
  24 #include "third_party/khronos/GLES2/gl2ext.h"
  25 #include "third_party/skia/include/core/SkBitmap.h"
  26 #include "third_party/skia/include/core/SkPaint.h"
  27 #include "third_party/skia/include/core/SkTypeface.h"
  28 #include "third_party/skia/include/effects/SkColorMatrixFilter.h"
  29 #include "ui/gfx/point.h"
  30 #include "ui/gfx/size.h"
  31
  32 namespace cc {
  33
  34 static inline SkPaint CreatePaint() {
  35   SkPaint paint;
  36 #if (SK_R32_SHIFT || SK_B32_SHIFT != 16)
  37   // The SkCanvas is in RGBA but the shader is expecting BGRA, so we need to
  38   // swizzle our colors when drawing to the SkCanvas.
  39   SkColorMatrix swizzle_matrix;
  40   for (int i = 0; i < 20; ++i)
  41     swizzle_matrix.fMat[i] = 0;
  42   swizzle_matrix.fMat[0 + 5 * 2] = 1;
  43   swizzle_matrix.fMat[1 + 5 * 1] = 1;
  44   swizzle_matrix.fMat[2 + 5 * 0] = 1;
  45   swizzle_matrix.fMat[3 + 5 * 3] = 1;
  46
  47   skia::RefPtr<SkColorMatrixFilter> filter =
  48       skia::AdoptRef(new SkColorMatrixFilter(swizzle_matrix));
  49   paint.setColorFilter(filter.get());
  50 #endif
  51   return paint;
  52 }
  53
  54 HeadsUpDisplayLayerImpl::Graph::Graph(double indicator_value,
  55                                       double start_upper_bound)
  56     : value(0.0),
  57       min(0.0),
  58       max(0.0),
  59       current_upper_bound(start_upper_bound),
  60       default_upper_bound(start_upper_bound),
  61       indicator(indicator_value) {}
  62
  63 double HeadsUpDisplayLayerImpl::Graph::UpdateUpperBound() {
  64   double target_upper_bound = std::max(max, default_upper_bound);
  65   current_upper_bound += (target_upper_bound - current_upper_bound) * 0.5;
  66   return current_upper_bound;
  67 }
  68
  69 HeadsUpDisplayLayerImpl::HeadsUpDisplayLayerImpl(LayerTreeImpl* tree_impl,
  70                                                  int id)
  71     : LayerImpl(tree_impl, id),
  72       typeface_(skia::AdoptRef(
  73           SkTypeface::CreateFromName("monospace", SkTypeface::kBold))),
  74       fps_graph_(60.0, 80.0),
  75       paint_time_graph_(16.0, 48.0) {}
  76
  77 HeadsUpDisplayLayerImpl::~HeadsUpDisplayLayerImpl() {}
  78
  79 scoped_ptr<LayerImpl> HeadsUpDisplayLayerImpl::CreateLayerImpl(
  80     LayerTreeImpl* tree_impl) {
  81   return HeadsUpDisplayLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
  82 }
  83
  84 bool HeadsUpDisplayLayerImpl::WillDraw(DrawMode draw_mode,
  85                                        ResourceProvider* resource_provider) {
  86   if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
  87     return false;
  88
  89   if (!hud_resource_)
  90     hud_resource_ = ScopedResource::create(resource_provider);
  91
  92   // TODO(danakj): Scale the HUD by device scale to make it more friendly under
  93   // high DPI.
  94
  95   // TODO(danakj): The HUD could swap between two textures instead of creating a
  96   // texture every frame in ubercompositor.
  97   if (hud_resource_->size() != bounds() ||
  98       resource_provider->InUseByConsumer(hud_resource_->id()))
  99     hud_resource_->Free();
 100
 101   if (!hud_resource_->id()) {
 102     hud_resource_->Allocate(
 103         bounds(), GL_RGBA, ResourceProvider::TextureUsageAny);
 104   }
 105
 106   return LayerImpl::WillDraw(draw_mode, resource_provider);
 107 }
 108
 109 void HeadsUpDisplayLayerImpl::AppendQuads(QuadSink* quad_sink,
 110                                           AppendQuadsData* append_quads_data) {
 111   if (!hud_resource_->id())
 112     return;
 113
 114   SharedQuadState* shared_quad_state =
 115       quad_sink->UseSharedQuadState(CreateSharedQuadState());
 116
 117   gfx::Rect quad_rect(bounds());
 118   gfx::Rect opaque_rect(contents_opaque() ? quad_rect : gfx::Rect());
 119   bool premultiplied_alpha = true;
 120   gfx::PointF uv_top_left(0.f, 0.f);
 121   gfx::PointF uv_bottom_right(1.f, 1.f);
 122   const float vertex_opacity[] = { 1.f, 1.f, 1.f, 1.f };
 123   bool flipped = false;
 124   scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
 125   quad->SetNew(shared_quad_state,
 126                quad_rect,
 127                opaque_rect,
 128                hud_resource_->id(),
 129                premultiplied_alpha,
 130                uv_top_left,
 131                uv_bottom_right,
 132                vertex_opacity,
 133                flipped);
 134   quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
 135 }
 136
 137 void HeadsUpDisplayLayerImpl::UpdateHudTexture(
 138     ResourceProvider* resource_provider) {
 139   if (!hud_resource_->id())
 140     return;
 141
 142   SkISize canvas_size;
 143   if (hud_canvas_)
 144     canvas_size = hud_canvas_->getDeviceSize();
 145   else
 146     canvas_size.set(0, 0);
 147
 148   if (canvas_size.fWidth != bounds().width() ||
 149       canvas_size.fHeight != bounds().height() || !hud_canvas_) {
 150     bool opaque = false;
 151     hud_canvas_ = make_scoped_ptr(
 152         skia::CreateBitmapCanvas(bounds().width(), bounds().height(), opaque));
 153   }
 154
 155   UpdateHudContents();
 156
 157   hud_canvas_->clear(SkColorSetARGB(0, 0, 0, 0));
 158   DrawHudContents(hud_canvas_.get());
 159
 160   const SkBitmap* bitmap = &hud_canvas_->getDevice()->accessBitmap(false);
 161   SkAutoLockPixels locker(*bitmap);
 162
 163   gfx::Rect layer_rect(bounds());
 164   DCHECK(bitmap->config() == SkBitmap::kARGB_8888_Config);
 165   resource_provider->SetPixels(hud_resource_->id(),
 166                                static_cast<const uint8_t*>(bitmap->getPixels()),
 167                                layer_rect,
 168                                layer_rect,
 169                                gfx::Vector2d());
 170 }
 171
 172 void HeadsUpDisplayLayerImpl::DidLoseOutputSurface() { hud_resource_.reset(); }
 173
 174 bool HeadsUpDisplayLayerImpl::LayerIsAlwaysDamaged() const { return true; }
 175
 176 void HeadsUpDisplayLayerImpl::UpdateHudContents() {
 177   const LayerTreeDebugState& debug_state = layer_tree_impl()->debug_state();
 178
 179   // Don't update numbers every frame so text is readable.
 180   base::TimeTicks now = layer_tree_impl()->CurrentFrameTimeTicks();
 181   if (base::TimeDelta(now - time_of_last_graph_update_).InSecondsF() > 0.25f) {
 182     time_of_last_graph_update_ = now;
 183
 184     if (debug_state.show_fps_counter) {
 185       FrameRateCounter* fps_counter = layer_tree_impl()->frame_rate_counter();
 186       fps_graph_.value = fps_counter->GetAverageFPS();
 187       fps_counter->GetMinAndMaxFPS(&fps_graph_.min, &fps_graph_.max);
 188     }
 189
 190     if (debug_state.continuous_painting) {
 191       PaintTimeCounter* paint_time_counter =
 192           layer_tree_impl()->paint_time_counter();
 193       base::TimeDelta latest, min, max;
 194
 195       if (paint_time_counter->End())
 196         latest = **paint_time_counter->End();
 197       paint_time_counter->GetMinAndMaxPaintTime(&min, &max);
 198
 199       paint_time_graph_.value = latest.InMillisecondsF();
 200       paint_time_graph_.min = min.InMillisecondsF();
 201       paint_time_graph_.max = max.InMillisecondsF();
 202     }
 203
 204     if (debug_state.ShowMemoryStats()) {
 205       MemoryHistory* memory_history = layer_tree_impl()->memory_history();
 206       if (memory_history->End())
 207         memory_entry_ = **memory_history->End();
 208       else
 209         memory_entry_ = MemoryHistory::Entry();
 210     }
 211   }
 212
 213   fps_graph_.UpdateUpperBound();
 214   paint_time_graph_.UpdateUpperBound();
 215 }
 216
 217 void HeadsUpDisplayLayerImpl::DrawHudContents(SkCanvas* canvas) const {
 218   const LayerTreeDebugState& debug_state = layer_tree_impl()->debug_state();
 219
 220   if (debug_state.ShowHudRects())
 221     DrawDebugRects(canvas, layer_tree_impl()->debug_rect_history());
 222
 223   SkRect area = SkRect::MakeEmpty();
 224   if (debug_state.continuous_painting) {
 225     // Don't show the FPS display when continuous painting is enabled, because
 226     // it would show misleading numbers.
 227     area = DrawPaintTimeDisplay(
 228         canvas, layer_tree_impl()->paint_time_counter(), 0, 0);
 229   } else if (debug_state.show_fps_counter) {
 230     area =
 231         DrawFPSDisplay(canvas, layer_tree_impl()->frame_rate_counter(), 0, 0);
 232   }
 233
 234   if (debug_state.ShowMemoryStats())
 235     DrawMemoryDisplay(canvas, 0, area.bottom(), SkMaxScalar(area.width(), 150));
 236 }
 237
 238 void HeadsUpDisplayLayerImpl::DrawText(SkCanvas* canvas,
 239                                        SkPaint* paint,
 240                                        const std::string& text,
 241                                        SkPaint::Align align,
 242                                        int size,
 243                                        int x,
 244                                        int y) const {
 245   const bool anti_alias = paint->isAntiAlias();
 246   paint->setAntiAlias(true);
 247
 248   paint->setTextSize(size);
 249   paint->setTextAlign(align);
 250   paint->setTypeface(typeface_.get());
 251   canvas->drawText(text.c_str(), text.length(), x, y, *paint);
 252
 253   paint->setAntiAlias(anti_alias);
 254 }
 255
 256 void HeadsUpDisplayLayerImpl::DrawText(SkCanvas* canvas,
 257                                        SkPaint* paint,
 258                                        const std::string& text,
 259                                        SkPaint::Align align,
 260                                        int size,
 261                                        const SkPoint& pos) const {
 262   DrawText(canvas, paint, text, align, size, pos.x(), pos.y());
 263 }
 264
 265 void HeadsUpDisplayLayerImpl::DrawGraphBackground(SkCanvas* canvas,
 266                                                   SkPaint* paint,
 267                                                   const SkRect& bounds) const {
 268   paint->setColor(DebugColors::HUDBackgroundColor());
 269   canvas->drawRect(bounds, *paint);
 270 }
 271
 272 void HeadsUpDisplayLayerImpl::DrawGraphLines(SkCanvas* canvas,
 273                                              SkPaint* paint,
 274                                              const SkRect& bounds,
 275                                              const Graph& graph) const {
 276   // Draw top and bottom line.
 277   paint->setColor(DebugColors::HUDSeparatorLineColor());
 278   canvas->drawLine(bounds.left(),
 279                    bounds.top() - 1,
 280                    bounds.right(),
 281                    bounds.top() - 1,
 282                    *paint);
 283   canvas->drawLine(
 284       bounds.left(), bounds.bottom(), bounds.right(), bounds.bottom(), *paint);
 285
 286   // Draw indicator line (additive blend mode to increase contrast when drawn on
 287   // top of graph).
 288   paint->setColor(DebugColors::HUDIndicatorLineColor());
 289   paint->setXfermodeMode(SkXfermode::kPlus_Mode);
 290   const double indicator_top =
 291       bounds.height() * (1.0 - graph.indicator / graph.current_upper_bound) -
 292       1.0;
 293   canvas->drawLine(bounds.left(),
 294                    bounds.top() + indicator_top,
 295                    bounds.right(),
 296                    bounds.top() + indicator_top,
 297                    *paint);
 298   paint->setXfermode(NULL);
 299 }
 300
 301 SkRect HeadsUpDisplayLayerImpl::DrawFPSDisplay(
 302     SkCanvas* canvas,
 303     const FrameRateCounter* fps_counter,
 304     int right,
 305     int top) const {
 306   const int kPadding = 4;
 307   const int kGap = 6;
 308
 309   const int kFontHeight = 15;
 310
 311   const int kGraphWidth = fps_counter->time_stamp_history_size() - 2;
 312   const int kGraphHeight = 40;
 313
 314   const int kHistogramWidth = 37;
 315
 316   int width = kGraphWidth + kHistogramWidth + 4 * kPadding;
 317   int height = kFontHeight + kGraphHeight + 4 * kPadding + 2;
 318   int left = bounds().width() - width - right;
 319   SkRect area = SkRect::MakeXYWH(left, top, width, height);
 320
 321   SkPaint paint = CreatePaint();
 322   DrawGraphBackground(canvas, &paint, area);
 323
 324   SkRect text_bounds =
 325       SkRect::MakeXYWH(left + kPadding,
 326                        top + kPadding,
 327                        kGraphWidth + kHistogramWidth + kGap + 2,
 328                        kFontHeight);
 329   SkRect graph_bounds = SkRect::MakeXYWH(left + kPadding,
 330                                          text_bounds.bottom() + 2 * kPadding,
 331                                          kGraphWidth,
 332                                          kGraphHeight);
 333   SkRect histogram_bounds = SkRect::MakeXYWH(graph_bounds.right() + kGap,
 334                                              graph_bounds.top(),
 335                                              kHistogramWidth,
 336                                              kGraphHeight);
 337
 338   const std::string value_text =
 339       base::StringPrintf("FPS:%5.1f", fps_graph_.value);
 340   const std::string min_max_text =
 341       base::StringPrintf("%.0f-%.0f", fps_graph_.min, fps_graph_.max);
 342
 343   paint.setColor(DebugColors::FPSDisplayTextAndGraphColor());
 344   DrawText(canvas,
 345            &paint,
 346            value_text,
 347            SkPaint::kLeft_Align,
 348            kFontHeight,
 349            text_bounds.left(),
 350            text_bounds.bottom());
 351   DrawText(canvas,
 352            &paint,
 353            min_max_text,
 354            SkPaint::kRight_Align,
 355            kFontHeight,
 356            text_bounds.right(),
 357            text_bounds.bottom());
 358
 359   DrawGraphLines(canvas, &paint, graph_bounds, fps_graph_);
 360
 361   // Collect graph and histogram data.
 362   SkPath path;
 363
 364   const int kHistogramSize = 20;
 365   double histogram[kHistogramSize] = { 1.0 };
 366   double max_bucket_value = 1.0;
 367
 368   for (FrameRateCounter::RingBufferType::Iterator it = --fps_counter->end(); it;
 369        --it) {
 370     base::TimeDelta delta = fps_counter->RecentFrameInterval(it.index() + 1);
 371
 372     // Skip this particular instantaneous frame rate if it is not likely to have
 373     // been valid.
 374     if (!fps_counter->IsBadFrameInterval(delta)) {
 375       double fps = 1.0 / delta.InSecondsF();
 376
 377       // Clamp the FPS to the range we want to plot visually.
 378       double p = fps / fps_graph_.current_upper_bound;
 379       if (p > 1.0)
 380         p = 1.0;
 381
 382       // Plot this data point.
 383       SkPoint cur =
 384           SkPoint::Make(graph_bounds.left() + it.index(),
 385                         graph_bounds.bottom() - p * graph_bounds.height());
 386       if (path.isEmpty())
 387         path.moveTo(cur);
 388       else
 389         path.lineTo(cur);
 390
 391       // Use the fps value to find the right bucket in the histogram.
 392       int bucket_index = floor(p * (kHistogramSize - 1));
 393
 394       // Add the delta time to take the time spent at that fps rate into
 395       // account.
 396       histogram[bucket_index] += delta.InSecondsF();
 397       max_bucket_value = std::max(histogram[bucket_index], max_bucket_value);
 398     }
 399   }
 400
 401   // Draw FPS histogram.
 402   paint.setColor(DebugColors::HUDSeparatorLineColor());
 403   canvas->drawLine(histogram_bounds.left() - 1,
 404                    histogram_bounds.top() - 1,
 405                    histogram_bounds.left() - 1,
 406                    histogram_bounds.bottom() + 1,
 407                    paint);
 408   canvas->drawLine(histogram_bounds.right() + 1,
 409                    histogram_bounds.top() - 1,
 410                    histogram_bounds.right() + 1,
 411                    histogram_bounds.bottom() + 1,
 412                    paint);
 413
 414   paint.setColor(DebugColors::FPSDisplayTextAndGraphColor());
 415   const double bar_height = histogram_bounds.height() / kHistogramSize;
 416
 417   for (int i = kHistogramSize - 1; i >= 0; --i) {
 418     if (histogram[i] > 0) {
 419       double bar_width =
 420           histogram[i] / max_bucket_value * histogram_bounds.width();
 421       canvas->drawRect(
 422           SkRect::MakeXYWH(histogram_bounds.left(),
 423                            histogram_bounds.bottom() - (i + 1) * bar_height,
 424                            bar_width,
 425                            1),
 426           paint);
 427     }
 428   }
 429
 430   // Draw FPS graph.
 431   paint.setAntiAlias(true);
 432   paint.setStyle(SkPaint::kStroke_Style);
 433   paint.setStrokeWidth(1);
 434   canvas->drawPath(path, paint);
 435
 436   return area;
 437 }
 438
 439 SkRect HeadsUpDisplayLayerImpl::DrawMemoryDisplay(SkCanvas* canvas,
 440                                                   int right,
 441                                                   int top,
 442                                                   int width) const {
 443   if (!memory_entry_.bytes_total())
 444     return SkRect::MakeEmpty();
 445
 446   const int kPadding = 4;
 447   const int kFontHeight = 13;
 448
 449   const int height = 3 * kFontHeight + 4 * kPadding;
 450   const int left = bounds().width() - width - right;
 451   const SkRect area = SkRect::MakeXYWH(left, top, width, height);
 452
 453   const double megabyte = 1024.0 * 1024.0;
 454
 455   SkPaint paint = CreatePaint();
 456   DrawGraphBackground(canvas, &paint, area);
 457
 458   SkPoint title_pos = SkPoint::Make(left + kPadding, top + kFontHeight);
 459   SkPoint stat1_pos = SkPoint::Make(left + width - kPadding - 1,
 460                                     top + kPadding + 2 * kFontHeight);
 461   SkPoint stat2_pos = SkPoint::Make(left + width - kPadding - 1,
 462                                     top + 2 * kPadding + 3 * kFontHeight);
 463
 464   paint.setColor(DebugColors::MemoryDisplayTextColor());
 465   DrawText(canvas,
 466            &paint,
 467            "GPU memory",
 468            SkPaint::kLeft_Align,
 469            kFontHeight,
 470            title_pos);
 471
 472   std::string text =
 473       base::StringPrintf("%6.1f MB used",
 474                          (memory_entry_.bytes_unreleasable +
 475                           memory_entry_.bytes_allocated) / megabyte);
 476   DrawText(canvas, &paint, text, SkPaint::kRight_Align, kFontHeight, stat1_pos);
 477
 478   if (memory_entry_.bytes_over) {
 479     paint.setColor(SK_ColorRED);
 480     text = base::StringPrintf("%6.1f MB over",
 481                               memory_entry_.bytes_over / megabyte);
 482   } else {
 483     text = base::StringPrintf("%6.1f MB max ",
 484                               memory_entry_.total_budget_in_bytes / megabyte);
 485   }
 486   DrawText(canvas, &paint, text, SkPaint::kRight_Align, kFontHeight, stat2_pos);
 487
 488   return area;
 489 }
 490
 491 SkRect HeadsUpDisplayLayerImpl::DrawPaintTimeDisplay(
 492     SkCanvas* canvas,
 493     const PaintTimeCounter* paint_time_counter,
 494     int right,
 495     int top) const {
 496   const int kPadding = 4;
 497   const int kFontHeight = 15;
 498
 499   const int kGraphWidth = paint_time_counter->HistorySize();
 500   const int kGraphHeight = 40;
 501
 502   const int width = kGraphWidth + 2 * kPadding;
 503   const int height =
 504       kFontHeight + kGraphHeight + 4 * kPadding + 2 + kFontHeight + kPadding;
 505   const int left = bounds().width() - width - right;
 506
 507   const SkRect area = SkRect::MakeXYWH(left, top, width, height);
 508
 509   SkPaint paint = CreatePaint();
 510   DrawGraphBackground(canvas, &paint, area);
 511
 512   SkRect text_bounds = SkRect::MakeXYWH(
 513       left + kPadding, top + kPadding, kGraphWidth, kFontHeight);
 514   SkRect text_bounds2 = SkRect::MakeXYWH(left + kPadding,
 515                                          text_bounds.bottom() + kPadding,
 516                                          kGraphWidth,
 517                                          kFontHeight);
 518   SkRect graph_bounds = SkRect::MakeXYWH(left + kPadding,
 519                                          text_bounds2.bottom() + 2 * kPadding,
 520                                          kGraphWidth,
 521                                          kGraphHeight);
 522
 523   const std::string value_text =
 524       base::StringPrintf("%.1f", paint_time_graph_.value);
 525   const std::string min_max_text = base::StringPrintf(
 526       "%.1f-%.1f", paint_time_graph_.min, paint_time_graph_.max);
 527
 528   paint.setColor(DebugColors::PaintTimeDisplayTextAndGraphColor());
 529   DrawText(canvas,
 530            &paint,
 531            "Page paint time (ms)",
 532            SkPaint::kLeft_Align,
 533            kFontHeight,
 534            text_bounds.left(),
 535            text_bounds.bottom());
 536   DrawText(canvas,
 537            &paint,
 538            value_text,
 539            SkPaint::kLeft_Align,
 540            kFontHeight,
 541            text_bounds2.left(),
 542            text_bounds2.bottom());
 543   DrawText(canvas,
 544            &paint,
 545            min_max_text,
 546            SkPaint::kRight_Align,
 547            kFontHeight,
 548            text_bounds2.right(),
 549            text_bounds2.bottom());
 550
 551   paint.setColor(DebugColors::PaintTimeDisplayTextAndGraphColor());
 552   for (PaintTimeCounter::RingBufferType::Iterator it =
 553            paint_time_counter->End();
 554        it;
 555        --it) {
 556     double pt = it->InMillisecondsF();
 557
 558     if (pt == 0.0)
 559       continue;
 560
 561     double p = pt / paint_time_graph_.current_upper_bound;
 562     if (p > 1.0)
 563       p = 1.0;
 564
 565     canvas->drawRect(
 566         SkRect::MakeXYWH(graph_bounds.left() + it.index(),
 567                          graph_bounds.bottom() - p * graph_bounds.height(),
 568                          1,
 569                          p * graph_bounds.height()),
 570         paint);
 571   }
 572
 573   DrawGraphLines(canvas, &paint, graph_bounds, paint_time_graph_);
 574
 575   return area;
 576 }
 577
 578 void HeadsUpDisplayLayerImpl::DrawDebugRects(
 579     SkCanvas* canvas,
 580     DebugRectHistory* debug_rect_history) const {
 581   const std::vector<DebugRect>& debug_rects = debug_rect_history->debug_rects();
 582   float rect_scale = 1.f / layer_tree_impl()->device_scale_factor();
 583   SkPaint paint = CreatePaint();
 584
 585   canvas->save();
 586   canvas->scale(rect_scale, rect_scale);
 587
 588   for (size_t i = 0; i < debug_rects.size(); ++i) {
 589     SkColor stroke_color = 0;
 590     SkColor fill_color = 0;
 591     float stroke_width = 0.f;
 592     std::string label_text;
 593
 594     switch (debug_rects[i].type) {
 595       case PAINT_RECT_TYPE:
 596         stroke_color = DebugColors::PaintRectBorderColor();
 597         fill_color = DebugColors::PaintRectFillColor();
 598         stroke_width = DebugColors::PaintRectBorderWidth(layer_tree_impl());
 599         break;
 600       case PROPERTY_CHANGED_RECT_TYPE:
 601         stroke_color = DebugColors::PropertyChangedRectBorderColor();
 602         fill_color = DebugColors::PropertyChangedRectFillColor();
 603         stroke_width =
 604             DebugColors::PropertyChangedRectBorderWidth(layer_tree_impl());
 605         break;
 606       case SURFACE_DAMAGE_RECT_TYPE:
 607         stroke_color = DebugColors::SurfaceDamageRectBorderColor();
 608         fill_color = DebugColors::SurfaceDamageRectFillColor();
 609         stroke_width =
 610             DebugColors::SurfaceDamageRectBorderWidth(layer_tree_impl());
 611         break;
 612       case REPLICA_SCREEN_SPACE_RECT_TYPE:
 613         stroke_color = DebugColors::ScreenSpaceSurfaceReplicaRectBorderColor();
 614         fill_color = DebugColors::ScreenSpaceSurfaceReplicaRectFillColor();
 615         stroke_width = DebugColors::ScreenSpaceSurfaceReplicaRectBorderWidth(
 616             layer_tree_impl());
 617         break;
 618       case SCREEN_SPACE_RECT_TYPE:
 619         stroke_color = DebugColors::ScreenSpaceLayerRectBorderColor();
 620         fill_color = DebugColors::ScreenSpaceLayerRectFillColor();
 621         stroke_width =
 622             DebugColors::ScreenSpaceLayerRectBorderWidth(layer_tree_impl());
 623         break;
 624       case OCCLUDING_RECT_TYPE:
 625         stroke_color = DebugColors::OccludingRectBorderColor();
 626         fill_color = DebugColors::OccludingRectFillColor();
 627         stroke_width = DebugColors::OccludingRectBorderWidth(layer_tree_impl());
 628         break;
 629       case NONOCCLUDING_RECT_TYPE:
 630         stroke_color = DebugColors::NonOccludingRectBorderColor();
 631         fill_color = DebugColors::NonOccludingRectFillColor();
 632         stroke_width =
 633             DebugColors::NonOccludingRectBorderWidth(layer_tree_impl());
 634         break;
 635       case TOUCH_EVENT_HANDLER_RECT_TYPE:
 636         stroke_color = DebugColors::TouchEventHandlerRectBorderColor();
 637         fill_color = DebugColors::TouchEventHandlerRectFillColor();
 638         stroke_width =
 639             DebugColors::TouchEventHandlerRectBorderWidth(layer_tree_impl());
 640         label_text = "touch event listener";
 641         break;
 642       case WHEEL_EVENT_HANDLER_RECT_TYPE:
 643         stroke_color = DebugColors::WheelEventHandlerRectBorderColor();
 644         fill_color = DebugColors::WheelEventHandlerRectFillColor();
 645         stroke_width =
 646             DebugColors::WheelEventHandlerRectBorderWidth(layer_tree_impl());
 647         label_text = "mousewheel event listener";
 648         break;
 649       case NON_FAST_SCROLLABLE_RECT_TYPE:
 650         stroke_color = DebugColors::NonFastScrollableRectBorderColor();
 651         fill_color = DebugColors::NonFastScrollableRectFillColor();
 652         stroke_width =
 653             DebugColors::NonFastScrollableRectBorderWidth(layer_tree_impl());
 654         label_text = "repaints on scroll";
 655         break;
 656     }
 657
 658     const gfx::RectF& rect = debug_rects[i].rect;
 659     SkRect sk_rect =
 660         SkRect::MakeXYWH(rect.x(), rect.y(), rect.width(), rect.height());
 661     paint.setColor(fill_color);
 662     paint.setStyle(SkPaint::kFill_Style);
 663     canvas->drawRect(sk_rect, paint);
 664
 665     paint.setColor(stroke_color);
 666     paint.setStyle(SkPaint::kStroke_Style);
 667     paint.setStrokeWidth(SkFloatToScalar(stroke_width));
 668     canvas->drawRect(sk_rect, paint);
 669
 670     if (label_text.length()) {
 671       const int kFontHeight = 12;
 672       const int kPadding = 3;
 673       const float device_scale_factor =
 674           layer_tree_impl()->device_scale_factor();
 675
 676       canvas->save();
 677       canvas->clipRect(sk_rect);
 678       canvas->translate(sk_rect.x(), sk_rect.y());
 679       canvas->scale(device_scale_factor, device_scale_factor);
 680
 681       SkPaint label_paint = CreatePaint();
 682       label_paint.setTextSize(kFontHeight);
 683       label_paint.setTypeface(typeface_.get());
 684       label_paint.setColor(stroke_color);
 685
 686       const SkScalar label_text_width =
 687           label_paint.measureText(label_text.c_str(), label_text.length());
 688       canvas->drawRect(SkRect::MakeWH(label_text_width + 2 * kPadding,
 689                                       kFontHeight + 2 * kPadding),
 690                        label_paint);
 691
 692       label_paint.setAntiAlias(true);
 693       label_paint.setColor(SkColorSetARGB(255, 50, 50, 50));
 694       canvas->drawText(label_text.c_str(),
 695                        label_text.length(),
 696                        kPadding,
 697                        kFontHeight * 0.8f + kPadding,
 698                        label_paint);
 699
 700       canvas->restore();
 701     }
 702   }
 703
 704   canvas->restore();
 705 }
 706
 707 const char* HeadsUpDisplayLayerImpl::LayerTypeAsString() const {
 708   return "cc::HeadsUpDisplayLayerImpl";
 709 }
 710
 711 }  // namespace cc