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      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/stringprintf.h"
     11 #include "cc/debug/debug_colors.h"
     12 #include "cc/debug/debug_rect_history.h"
     13 #include "cc/debug/frame_rate_counter.h"
     14 #include "cc/debug/paint_time_counter.h"
     15 #include "cc/debug/traced_value.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/trees/layer_tree_impl.h"
     21 #include "skia/ext/platform_canvas.h"
     22 #include "third_party/khronos/GLES2/gl2.h"
     23 #include "third_party/khronos/GLES2/gl2ext.h"
     24 #include "third_party/skia/include/core/SkBitmap.h"
     25 #include "third_party/skia/include/core/SkPaint.h"
     26 #include "third_party/skia/include/core/SkTypeface.h"
     27 #include "third_party/skia/include/effects/SkColorMatrixFilter.h"
     28 #include "ui/gfx/point.h"
     29 #include "ui/gfx/size.h"
     30 
     31 namespace cc {
     32 
     33 static inline SkPaint CreatePaint() {
     34   SkPaint paint;
     35 #if (SK_R32_SHIFT || SK_B32_SHIFT != 16)
     36   // The SkCanvas is in RGBA but the shader is expecting BGRA, so we need to
     37   // swizzle our colors when drawing to the SkCanvas.
     38   SkColorMatrix swizzle_matrix;
     39   for (int i = 0; i < 20; ++i)
     40     swizzle_matrix.fMat[i] = 0;
     41   swizzle_matrix.fMat[0 + 5 * 2] = 1;
     42   swizzle_matrix.fMat[1 + 5 * 1] = 1;
     43   swizzle_matrix.fMat[2 + 5 * 0] = 1;
     44   swizzle_matrix.fMat[3 + 5 * 3] = 1;
     45 
     46   skia::RefPtr<SkColorMatrixFilter> filter =
     47       skia::AdoptRef(new SkColorMatrixFilter(swizzle_matrix));
     48   paint.setColorFilter(filter.get());
     49 #endif
     50   return paint;
     51 }
     52 
     53 HeadsUpDisplayLayerImpl::Graph::Graph(double indicator_value,
     54                                       double start_upper_bound)
     55     : value(0.0),
     56       min(0.0),
     57       max(0.0),
     58       current_upper_bound(start_upper_bound),
     59       default_upper_bound(start_upper_bound),
     60       indicator(indicator_value) {}
     61 
     62 double HeadsUpDisplayLayerImpl::Graph::UpdateUpperBound() {
     63   double target_upper_bound = std::max(max, default_upper_bound);
     64   current_upper_bound += (target_upper_bound - current_upper_bound) * 0.5;
     65   return current_upper_bound;
     66 }
     67 
     68 HeadsUpDisplayLayerImpl::HeadsUpDisplayLayerImpl(LayerTreeImpl* tree_impl,
     69                                                  int id)
     70     : LayerImpl(tree_impl, id),
     71       typeface_(skia::AdoptRef(
     72           SkTypeface::CreateFromName("monospace", SkTypeface::kBold))),
     73       fps_graph_(60.0, 80.0),
     74       paint_time_graph_(16.0, 48.0) {}
     75 
     76 HeadsUpDisplayLayerImpl::~HeadsUpDisplayLayerImpl() {}
     77 
     78 scoped_ptr<LayerImpl> HeadsUpDisplayLayerImpl::CreateLayerImpl(
     79     LayerTreeImpl* tree_impl) {
     80   return HeadsUpDisplayLayerImpl::Create(tree_impl, id()).PassAs<LayerImpl>();
     81 }
     82 
     83 bool HeadsUpDisplayLayerImpl::WillDraw(DrawMode draw_mode,
     84                                        ResourceProvider* resource_provider) {
     85   if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE)
     86     return false;
     87 
     88   if (!hud_resource_)
     89     hud_resource_ = ScopedResource::Create(resource_provider);
     90 
     91   // TODO(danakj): The HUD could swap between two textures instead of creating a
     92   // texture every frame in ubercompositor.
     93   if (hud_resource_->size() != content_bounds() ||
     94       (hud_resource_->id() &&
     95        resource_provider->InUseByConsumer(hud_resource_->id()))) {
     96     hud_resource_->Free();
     97   }
     98 
     99   if (!hud_resource_->id()) {
    100     hud_resource_->Allocate(content_bounds(),
    101                             ResourceProvider::TextureUsageAny,
    102                             RGBA_8888);
    103   }
    104 
    105   return LayerImpl::WillDraw(draw_mode, resource_provider);
    106 }
    107 
    108 void HeadsUpDisplayLayerImpl::AppendQuads(QuadSink* quad_sink,
    109                                           AppendQuadsData* append_quads_data) {
    110   if (!hud_resource_->id())
    111     return;
    112 
    113   SharedQuadState* shared_quad_state =
    114       quad_sink->UseSharedQuadState(CreateSharedQuadState());
    115 
    116   gfx::Rect quad_rect(content_bounds());
    117   gfx::Rect opaque_rect(contents_opaque() ? quad_rect : gfx::Rect());
    118   bool premultiplied_alpha = true;
    119   gfx::PointF uv_top_left(0.f, 0.f);
    120   gfx::PointF uv_bottom_right(1.f, 1.f);
    121   const float vertex_opacity[] = { 1.f, 1.f, 1.f, 1.f };
    122   bool flipped = false;
    123   scoped_ptr<TextureDrawQuad> quad = TextureDrawQuad::Create();
    124   quad->SetNew(shared_quad_state,
    125                quad_rect,
    126                opaque_rect,
    127                hud_resource_->id(),
    128                premultiplied_alpha,
    129                uv_top_left,
    130                uv_bottom_right,
    131                SK_ColorTRANSPARENT,
    132                vertex_opacity,
    133                flipped);
    134   quad_sink->Append(quad.PassAs<DrawQuad>(), append_quads_data);
    135 }
    136 
    137 void HeadsUpDisplayLayerImpl::UpdateHudTexture(
    138     DrawMode draw_mode,
    139     ResourceProvider* resource_provider) {
    140   if (draw_mode == DRAW_MODE_RESOURCELESS_SOFTWARE || !hud_resource_->id())
    141     return;
    142 
    143   SkISize canvas_size;
    144   if (hud_canvas_)
    145     canvas_size = hud_canvas_->getDeviceSize();
    146   else
    147     canvas_size.set(0, 0);
    148 
    149   if (canvas_size.width() != content_bounds().width() ||
    150       canvas_size.width() != content_bounds().height() || !hud_canvas_) {
    151     TRACE_EVENT0("cc", "ResizeHudCanvas");
    152     bool opaque = false;
    153     hud_canvas_ = make_scoped_ptr(skia::CreateBitmapCanvas(
    154         content_bounds().width(), content_bounds().height(), opaque));
    155   }
    156 
    157   UpdateHudContents();
    158 
    159   {
    160     TRACE_EVENT0("cc", "DrawHudContents");
    161     hud_canvas_->clear(SkColorSetARGB(0, 0, 0, 0));
    162     hud_canvas_->save();
    163     hud_canvas_->scale(contents_scale_x(), contents_scale_y());
    164 
    165     DrawHudContents(hud_canvas_.get());
    166 
    167     hud_canvas_->restore();
    168   }
    169 
    170   TRACE_EVENT0("cc", "UploadHudTexture");
    171   const SkBitmap* bitmap = &hud_canvas_->getDevice()->accessBitmap(false);
    172   SkAutoLockPixels locker(*bitmap);
    173 
    174   gfx::Rect content_rect(content_bounds());
    175   DCHECK(bitmap->config() == SkBitmap::kARGB_8888_Config);
    176   resource_provider->SetPixels(hud_resource_->id(),
    177                                static_cast<const uint8_t*>(bitmap->getPixels()),
    178                                content_rect,
    179                                content_rect,
    180                                gfx::Vector2d());
    181 }
    182 
    183 void HeadsUpDisplayLayerImpl::DidLoseOutputSurface() { hud_resource_.reset(); }
    184 
    185 bool HeadsUpDisplayLayerImpl::LayerIsAlwaysDamaged() const { return true; }
    186 
    187 void HeadsUpDisplayLayerImpl::UpdateHudContents() {
    188   const LayerTreeDebugState& debug_state = layer_tree_impl()->debug_state();
    189 
    190   // Don't update numbers every frame so text is readable.
    191   base::TimeTicks now = layer_tree_impl()->CurrentFrameTimeTicks();
    192   if (base::TimeDelta(now - time_of_last_graph_update_).InSecondsF() > 0.25f) {
    193     time_of_last_graph_update_ = now;
    194 
    195     if (debug_state.show_fps_counter) {
    196       FrameRateCounter* fps_counter = layer_tree_impl()->frame_rate_counter();
    197       fps_graph_.value = fps_counter->GetAverageFPS();
    198       fps_counter->GetMinAndMaxFPS(&fps_graph_.min, &fps_graph_.max);
    199     }
    200 
    201     if (debug_state.continuous_painting) {
    202       PaintTimeCounter* paint_time_counter =
    203           layer_tree_impl()->paint_time_counter();
    204       base::TimeDelta latest, min, max;
    205 
    206       if (paint_time_counter->End())
    207         latest = **paint_time_counter->End();
    208       paint_time_counter->GetMinAndMaxPaintTime(&min, &max);
    209 
    210       paint_time_graph_.value = latest.InMillisecondsF();
    211       paint_time_graph_.min = min.InMillisecondsF();
    212       paint_time_graph_.max = max.InMillisecondsF();
    213     }
    214 
    215     if (debug_state.ShowMemoryStats()) {
    216       MemoryHistory* memory_history = layer_tree_impl()->memory_history();
    217       if (memory_history->End())
    218         memory_entry_ = **memory_history->End();
    219       else
    220         memory_entry_ = MemoryHistory::Entry();
    221     }
    222   }
    223 
    224   fps_graph_.UpdateUpperBound();
    225   paint_time_graph_.UpdateUpperBound();
    226 }
    227 
    228 void HeadsUpDisplayLayerImpl::DrawHudContents(SkCanvas* canvas) const {
    229   const LayerTreeDebugState& debug_state = layer_tree_impl()->debug_state();
    230 
    231   if (debug_state.ShowHudRects())
    232     DrawDebugRects(canvas, layer_tree_impl()->debug_rect_history());
    233 
    234   SkRect area = SkRect::MakeEmpty();
    235   if (debug_state.continuous_painting) {
    236     area = DrawPaintTimeDisplay(
    237         canvas, layer_tree_impl()->paint_time_counter(), 0, 0);
    238   } else if (debug_state.show_fps_counter) {
    239     // Don't show the FPS display when continuous painting is enabled, because
    240     // it would show misleading numbers.
    241     area =
    242         DrawFPSDisplay(canvas, layer_tree_impl()->frame_rate_counter(), 0, 0);
    243   }
    244 
    245   if (debug_state.ShowMemoryStats())
    246     DrawMemoryDisplay(canvas, 0, area.bottom(), SkMaxScalar(area.width(), 150));
    247 }
    248 
    249 void HeadsUpDisplayLayerImpl::DrawText(SkCanvas* canvas,
    250                                        SkPaint* paint,
    251                                        const std::string& text,
    252                                        SkPaint::Align align,
    253                                        int size,
    254                                        int x,
    255                                        int y) const {
    256   const bool anti_alias = paint->isAntiAlias();
    257   paint->setAntiAlias(true);
    258 
    259   paint->setTextSize(size);
    260   paint->setTextAlign(align);
    261   paint->setTypeface(typeface_.get());
    262   canvas->drawText(text.c_str(), text.length(), x, y, *paint);
    263 
    264   paint->setAntiAlias(anti_alias);
    265 }
    266 
    267 void HeadsUpDisplayLayerImpl::DrawText(SkCanvas* canvas,
    268                                        SkPaint* paint,
    269                                        const std::string& text,
    270                                        SkPaint::Align align,
    271                                        int size,
    272                                        const SkPoint& pos) const {
    273   DrawText(canvas, paint, text, align, size, pos.x(), pos.y());
    274 }
    275 
    276 void HeadsUpDisplayLayerImpl::DrawGraphBackground(SkCanvas* canvas,
    277                                                   SkPaint* paint,
    278                                                   const SkRect& bounds) const {
    279   paint->setColor(DebugColors::HUDBackgroundColor());
    280   canvas->drawRect(bounds, *paint);
    281 }
    282 
    283 void HeadsUpDisplayLayerImpl::DrawGraphLines(SkCanvas* canvas,
    284                                              SkPaint* paint,
    285                                              const SkRect& bounds,
    286                                              const Graph& graph) const {
    287   // Draw top and bottom line.
    288   paint->setColor(DebugColors::HUDSeparatorLineColor());
    289   canvas->drawLine(bounds.left(),
    290                    bounds.top() - 1,
    291                    bounds.right(),
    292                    bounds.top() - 1,
    293                    *paint);
    294   canvas->drawLine(
    295       bounds.left(), bounds.bottom(), bounds.right(), bounds.bottom(), *paint);
    296 
    297   // Draw indicator line (additive blend mode to increase contrast when drawn on
    298   // top of graph).
    299   paint->setColor(DebugColors::HUDIndicatorLineColor());
    300   paint->setXfermodeMode(SkXfermode::kPlus_Mode);
    301   const double indicator_top =
    302       bounds.height() * (1.0 - graph.indicator / graph.current_upper_bound) -
    303       1.0;
    304   canvas->drawLine(bounds.left(),
    305                    bounds.top() + indicator_top,
    306                    bounds.right(),
    307                    bounds.top() + indicator_top,
    308                    *paint);
    309   paint->setXfermode(NULL);
    310 }
    311 
    312 SkRect HeadsUpDisplayLayerImpl::DrawFPSDisplay(
    313     SkCanvas* canvas,
    314     const FrameRateCounter* fps_counter,
    315     int right,
    316     int top) const {
    317   const int kPadding = 4;
    318   const int kGap = 6;
    319 
    320   const int kFontHeight = 15;
    321 
    322   const int kGraphWidth = fps_counter->time_stamp_history_size() - 2;
    323   const int kGraphHeight = 40;
    324 
    325   const int kHistogramWidth = 37;
    326 
    327   int width = kGraphWidth + kHistogramWidth + 4 * kPadding;
    328   int height = kFontHeight + kGraphHeight + 4 * kPadding + 2;
    329   int left = bounds().width() - width - right;
    330   SkRect area = SkRect::MakeXYWH(left, top, width, height);
    331 
    332   SkPaint paint = CreatePaint();
    333   DrawGraphBackground(canvas, &paint, area);
    334 
    335   SkRect text_bounds =
    336       SkRect::MakeXYWH(left + kPadding,
    337                        top + kPadding,
    338                        kGraphWidth + kHistogramWidth + kGap + 2,
    339                        kFontHeight);
    340   SkRect graph_bounds = SkRect::MakeXYWH(left + kPadding,
    341                                          text_bounds.bottom() + 2 * kPadding,
    342                                          kGraphWidth,
    343                                          kGraphHeight);
    344   SkRect histogram_bounds = SkRect::MakeXYWH(graph_bounds.right() + kGap,
    345                                              graph_bounds.top(),
    346                                              kHistogramWidth,
    347                                              kGraphHeight);
    348 
    349   const std::string value_text =
    350       base::StringPrintf("FPS:%5.1f", fps_graph_.value);
    351   const std::string min_max_text =
    352       base::StringPrintf("%.0f-%.0f", fps_graph_.min, fps_graph_.max);
    353 
    354   paint.setColor(DebugColors::FPSDisplayTextAndGraphColor());
    355   DrawText(canvas,
    356            &paint,
    357            value_text,
    358            SkPaint::kLeft_Align,
    359            kFontHeight,
    360            text_bounds.left(),
    361            text_bounds.bottom());
    362   DrawText(canvas,
    363            &paint,
    364            min_max_text,
    365            SkPaint::kRight_Align,
    366            kFontHeight,
    367            text_bounds.right(),
    368            text_bounds.bottom());
    369 
    370   DrawGraphLines(canvas, &paint, graph_bounds, fps_graph_);
    371 
    372   // Collect graph and histogram data.
    373   SkPath path;
    374 
    375   const int kHistogramSize = 20;
    376   double histogram[kHistogramSize] = { 1.0 };
    377   double max_bucket_value = 1.0;
    378 
    379   for (FrameRateCounter::RingBufferType::Iterator it = --fps_counter->end(); it;
    380        --it) {
    381     base::TimeDelta delta = fps_counter->RecentFrameInterval(it.index() + 1);
    382 
    383     // Skip this particular instantaneous frame rate if it is not likely to have
    384     // been valid.
    385     if (!fps_counter->IsBadFrameInterval(delta)) {
    386       double fps = 1.0 / delta.InSecondsF();
    387 
    388       // Clamp the FPS to the range we want to plot visually.
    389       double p = fps / fps_graph_.current_upper_bound;
    390       if (p > 1.0)
    391         p = 1.0;
    392 
    393       // Plot this data point.
    394       SkPoint cur =
    395           SkPoint::Make(graph_bounds.left() + it.index(),
    396                         graph_bounds.bottom() - p * graph_bounds.height());
    397       if (path.isEmpty())
    398         path.moveTo(cur);
    399       else
    400         path.lineTo(cur);
    401 
    402       // Use the fps value to find the right bucket in the histogram.
    403       int bucket_index = floor(p * (kHistogramSize - 1));
    404 
    405       // Add the delta time to take the time spent at that fps rate into
    406       // account.
    407       histogram[bucket_index] += delta.InSecondsF();
    408       max_bucket_value = std::max(histogram[bucket_index], max_bucket_value);
    409     }
    410   }
    411 
    412   // Draw FPS histogram.
    413   paint.setColor(DebugColors::HUDSeparatorLineColor());
    414   canvas->drawLine(histogram_bounds.left() - 1,
    415                    histogram_bounds.top() - 1,
    416                    histogram_bounds.left() - 1,
    417                    histogram_bounds.bottom() + 1,
    418                    paint);
    419   canvas->drawLine(histogram_bounds.right() + 1,
    420                    histogram_bounds.top() - 1,
    421                    histogram_bounds.right() + 1,
    422                    histogram_bounds.bottom() + 1,
    423                    paint);
    424 
    425   paint.setColor(DebugColors::FPSDisplayTextAndGraphColor());
    426   const double bar_height = histogram_bounds.height() / kHistogramSize;
    427 
    428   for (int i = kHistogramSize - 1; i >= 0; --i) {
    429     if (histogram[i] > 0) {
    430       double bar_width =
    431           histogram[i] / max_bucket_value * histogram_bounds.width();
    432       canvas->drawRect(
    433           SkRect::MakeXYWH(histogram_bounds.left(),
    434                            histogram_bounds.bottom() - (i + 1) * bar_height,
    435                            bar_width,
    436                            1),
    437           paint);
    438     }
    439   }
    440 
    441   // Draw FPS graph.
    442   paint.setAntiAlias(true);
    443   paint.setStyle(SkPaint::kStroke_Style);
    444   paint.setStrokeWidth(1);
    445   canvas->drawPath(path, paint);
    446 
    447   return area;
    448 }
    449 
    450 SkRect HeadsUpDisplayLayerImpl::DrawMemoryDisplay(SkCanvas* canvas,
    451                                                   int right,
    452                                                   int top,
    453                                                   int width) const {
    454   if (!memory_entry_.bytes_total())
    455     return SkRect::MakeEmpty();
    456 
    457   const int kPadding = 4;
    458   const int kFontHeight = 13;
    459 
    460   const int height = 3 * kFontHeight + 4 * kPadding;
    461   const int left = bounds().width() - width - right;
    462   const SkRect area = SkRect::MakeXYWH(left, top, width, height);
    463 
    464   const double megabyte = 1024.0 * 1024.0;
    465 
    466   SkPaint paint = CreatePaint();
    467   DrawGraphBackground(canvas, &paint, area);
    468 
    469   SkPoint title_pos = SkPoint::Make(left + kPadding, top + kFontHeight);
    470   SkPoint stat1_pos = SkPoint::Make(left + width - kPadding - 1,
    471                                     top + kPadding + 2 * kFontHeight);
    472   SkPoint stat2_pos = SkPoint::Make(left + width - kPadding - 1,
    473                                     top + 2 * kPadding + 3 * kFontHeight);
    474 
    475   paint.setColor(DebugColors::MemoryDisplayTextColor());
    476   DrawText(canvas,
    477            &paint,
    478            "GPU memory",
    479            SkPaint::kLeft_Align,
    480            kFontHeight,
    481            title_pos);
    482 
    483   std::string text =
    484       base::StringPrintf("%6.1f MB used",
    485                          (memory_entry_.bytes_unreleasable +
    486                           memory_entry_.bytes_allocated) / megabyte);
    487   DrawText(canvas, &paint, text, SkPaint::kRight_Align, kFontHeight, stat1_pos);
    488 
    489   if (memory_entry_.bytes_over) {
    490     paint.setColor(SK_ColorRED);
    491     text = base::StringPrintf("%6.1f MB over",
    492                               memory_entry_.bytes_over / megabyte);
    493   } else {
    494     text = base::StringPrintf("%6.1f MB max ",
    495                               memory_entry_.total_budget_in_bytes / megabyte);
    496   }
    497   DrawText(canvas, &paint, text, SkPaint::kRight_Align, kFontHeight, stat2_pos);
    498 
    499   return area;
    500 }
    501 
    502 SkRect HeadsUpDisplayLayerImpl::DrawPaintTimeDisplay(
    503     SkCanvas* canvas,
    504     const PaintTimeCounter* paint_time_counter,
    505     int right,
    506     int top) const {
    507   const int kPadding = 4;
    508   const int kFontHeight = 15;
    509 
    510   const int kGraphWidth = paint_time_counter->HistorySize();
    511   const int kGraphHeight = 40;
    512 
    513   const int width = kGraphWidth + 2 * kPadding;
    514   const int height =
    515       kFontHeight + kGraphHeight + 4 * kPadding + 2 + kFontHeight + kPadding;
    516   const int left = bounds().width() - width - right;
    517 
    518   const SkRect area = SkRect::MakeXYWH(left, top, width, height);
    519 
    520   SkPaint paint = CreatePaint();
    521   DrawGraphBackground(canvas, &paint, area);
    522 
    523   SkRect text_bounds = SkRect::MakeXYWH(
    524       left + kPadding, top + kPadding, kGraphWidth, kFontHeight);
    525   SkRect text_bounds2 = SkRect::MakeXYWH(left + kPadding,
    526                                          text_bounds.bottom() + kPadding,
    527                                          kGraphWidth,
    528                                          kFontHeight);
    529   SkRect graph_bounds = SkRect::MakeXYWH(left + kPadding,
    530                                          text_bounds2.bottom() + 2 * kPadding,
    531                                          kGraphWidth,
    532                                          kGraphHeight);
    533 
    534   const std::string value_text =
    535       base::StringPrintf("%.1f", paint_time_graph_.value);
    536   const std::string min_max_text = base::StringPrintf(
    537       "%.1f-%.1f", paint_time_graph_.min, paint_time_graph_.max);
    538 
    539   paint.setColor(DebugColors::PaintTimeDisplayTextAndGraphColor());
    540   DrawText(canvas,
    541            &paint,
    542            "Page paint time (ms)",
    543            SkPaint::kLeft_Align,
    544            kFontHeight,
    545            text_bounds.left(),
    546            text_bounds.bottom());
    547   DrawText(canvas,
    548            &paint,
    549            value_text,
    550            SkPaint::kLeft_Align,
    551            kFontHeight,
    552            text_bounds2.left(),
    553            text_bounds2.bottom());
    554   DrawText(canvas,
    555            &paint,
    556            min_max_text,
    557            SkPaint::kRight_Align,
    558            kFontHeight,
    559            text_bounds2.right(),
    560            text_bounds2.bottom());
    561 
    562   paint.setColor(DebugColors::PaintTimeDisplayTextAndGraphColor());
    563   for (PaintTimeCounter::RingBufferType::Iterator it =
    564            paint_time_counter->End();
    565        it;
    566        --it) {
    567     double pt = it->InMillisecondsF();
    568 
    569     if (pt == 0.0)
    570       continue;
    571 
    572     double p = pt / paint_time_graph_.current_upper_bound;
    573     if (p > 1.0)
    574       p = 1.0;
    575 
    576     canvas->drawRect(
    577         SkRect::MakeXYWH(graph_bounds.left() + it.index(),
    578                          graph_bounds.bottom() - p * graph_bounds.height(),
    579                          1,
    580                          p * graph_bounds.height()),
    581         paint);
    582   }
    583 
    584   DrawGraphLines(canvas, &paint, graph_bounds, paint_time_graph_);
    585 
    586   return area;
    587 }
    588 
    589 void HeadsUpDisplayLayerImpl::DrawDebugRects(
    590     SkCanvas* canvas,
    591     DebugRectHistory* debug_rect_history) const {
    592   const std::vector<DebugRect>& debug_rects = debug_rect_history->debug_rects();
    593   SkPaint paint = CreatePaint();
    594 
    595   for (size_t i = 0; i < debug_rects.size(); ++i) {
    596     SkColor stroke_color = 0;
    597     SkColor fill_color = 0;
    598     float stroke_width = 0.f;
    599     std::string label_text;
    600 
    601     switch (debug_rects[i].type) {
    602       case PAINT_RECT_TYPE:
    603         stroke_color = DebugColors::PaintRectBorderColor();
    604         fill_color = DebugColors::PaintRectFillColor();
    605         stroke_width = DebugColors::PaintRectBorderWidth();
    606         break;
    607       case PROPERTY_CHANGED_RECT_TYPE:
    608         stroke_color = DebugColors::PropertyChangedRectBorderColor();
    609         fill_color = DebugColors::PropertyChangedRectFillColor();
    610         stroke_width = DebugColors::PropertyChangedRectBorderWidth();
    611         break;
    612       case SURFACE_DAMAGE_RECT_TYPE:
    613         stroke_color = DebugColors::SurfaceDamageRectBorderColor();
    614         fill_color = DebugColors::SurfaceDamageRectFillColor();
    615         stroke_width = DebugColors::SurfaceDamageRectBorderWidth();
    616         break;
    617       case REPLICA_SCREEN_SPACE_RECT_TYPE:
    618         stroke_color = DebugColors::ScreenSpaceSurfaceReplicaRectBorderColor();
    619         fill_color = DebugColors::ScreenSpaceSurfaceReplicaRectFillColor();
    620         stroke_width = DebugColors::ScreenSpaceSurfaceReplicaRectBorderWidth();
    621         break;
    622       case SCREEN_SPACE_RECT_TYPE:
    623         stroke_color = DebugColors::ScreenSpaceLayerRectBorderColor();
    624         fill_color = DebugColors::ScreenSpaceLayerRectFillColor();
    625         stroke_width = DebugColors::ScreenSpaceLayerRectBorderWidth();
    626         break;
    627       case OCCLUDING_RECT_TYPE:
    628         stroke_color = DebugColors::OccludingRectBorderColor();
    629         fill_color = DebugColors::OccludingRectFillColor();
    630         stroke_width = DebugColors::OccludingRectBorderWidth();
    631         break;
    632       case NONOCCLUDING_RECT_TYPE:
    633         stroke_color = DebugColors::NonOccludingRectBorderColor();
    634         fill_color = DebugColors::NonOccludingRectFillColor();
    635         stroke_width = DebugColors::NonOccludingRectBorderWidth();
    636         break;
    637       case TOUCH_EVENT_HANDLER_RECT_TYPE:
    638         stroke_color = DebugColors::TouchEventHandlerRectBorderColor();
    639         fill_color = DebugColors::TouchEventHandlerRectFillColor();
    640         stroke_width = DebugColors::TouchEventHandlerRectBorderWidth();
    641         label_text = "touch event listener";
    642         break;
    643       case WHEEL_EVENT_HANDLER_RECT_TYPE:
    644         stroke_color = DebugColors::WheelEventHandlerRectBorderColor();
    645         fill_color = DebugColors::WheelEventHandlerRectFillColor();
    646         stroke_width = DebugColors::WheelEventHandlerRectBorderWidth();
    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 = DebugColors::NonFastScrollableRectBorderWidth();
    653         label_text = "repaints on scroll";
    654         break;
    655       case ANIMATION_BOUNDS_RECT_TYPE:
    656         stroke_color = DebugColors::LayerAnimationBoundsBorderColor();
    657         fill_color = DebugColors::LayerAnimationBoundsFillColor();
    658         stroke_width = DebugColors::LayerAnimationBoundsBorderWidth();
    659         label_text = "animation bounds";
    660         break;
    661     }
    662 
    663     gfx::RectF debug_layer_rect = gfx::ScaleRect(debug_rects[i].rect,
    664                                                  1.0 / contents_scale_x(),
    665                                                  1.0 / contents_scale_y());
    666     SkRect sk_rect = RectFToSkRect(debug_layer_rect);
    667     paint.setColor(fill_color);
    668     paint.setStyle(SkPaint::kFill_Style);
    669     canvas->drawRect(sk_rect, paint);
    670 
    671     paint.setColor(stroke_color);
    672     paint.setStyle(SkPaint::kStroke_Style);
    673     paint.setStrokeWidth(SkFloatToScalar(stroke_width));
    674     canvas->drawRect(sk_rect, paint);
    675 
    676     if (label_text.length()) {
    677       const int kFontHeight = 12;
    678       const int kPadding = 3;
    679 
    680       canvas->save();
    681       canvas->clipRect(sk_rect);
    682       canvas->translate(sk_rect.x(), sk_rect.y());
    683 
    684       SkPaint label_paint = CreatePaint();
    685       label_paint.setTextSize(kFontHeight);
    686       label_paint.setTypeface(typeface_.get());
    687       label_paint.setColor(stroke_color);
    688 
    689       const SkScalar label_text_width =
    690           label_paint.measureText(label_text.c_str(), label_text.length());
    691       canvas->drawRect(SkRect::MakeWH(label_text_width + 2 * kPadding,
    692                                       kFontHeight + 2 * kPadding),
    693                        label_paint);
    694 
    695       label_paint.setAntiAlias(true);
    696       label_paint.setColor(SkColorSetARGB(255, 50, 50, 50));
    697       canvas->drawText(label_text.c_str(),
    698                        label_text.length(),
    699                        kPadding,
    700                        kFontHeight * 0.8f + kPadding,
    701                        label_paint);
    702 
    703       canvas->restore();
    704     }
    705   }
    706 }
    707 
    708 const char* HeadsUpDisplayLayerImpl::LayerTypeAsString() const {
    709   return "cc::HeadsUpDisplayLayerImpl";
    710 }
    711 
    712 }  // namespace cc
    713