cc/picture.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 "base/debug/trace_event.h"
   6 #include "cc/content_layer_client.h"
   7 #include "cc/picture.h"
   8 #include "cc/rendering_stats.h"
   9 #include "third_party/skia/include/core/SkCanvas.h"
  10 #include "third_party/skia/include/core/SkData.h"
  11 #include "third_party/skia/include/utils/SkPictureUtils.h"
  12 #include "ui/gfx/rect_conversions.h"
  13
  14 namespace {
  15 // URI label for a lazily decoded SkPixelRef.
  16 const char labelLazyDecoded[] = "lazy";
  17 }
  18
  19 namespace cc {
  20
  21 scoped_refptr<Picture> Picture::Create(gfx::Rect layer_rect) {
  22   return make_scoped_refptr(new Picture(layer_rect));
  23 }
  24
  25 Picture::Picture(gfx::Rect layer_rect)
  26     : layer_rect_(layer_rect) {
  27 }
  28
  29 Picture::Picture(const skia::RefPtr<SkPicture>& picture,
  30                  gfx::Rect layer_rect,
  31                  gfx::Rect opaque_rect) :
  32     layer_rect_(layer_rect),
  33     opaque_rect_(opaque_rect),
  34     picture_(picture) {
  35 }
  36
  37 Picture::~Picture() {
  38 }
  39
  40 scoped_refptr<Picture> Picture::Clone() const {
  41   // SkPicture is not thread-safe to rasterize with, so return a thread-safe
  42   // clone of it.
  43   DCHECK(picture_);
  44   skia::RefPtr<SkPicture> clone = skia::AdoptRef(picture_->clone());
  45   return make_scoped_refptr(new Picture(clone, layer_rect_, opaque_rect_));
  46 }
  47
  48 void Picture::Record(ContentLayerClient* painter,
  49                      RenderingStats& stats) {
  50   TRACE_EVENT0("cc", "Picture::Record");
  51
  52   // Record() should only be called once.
  53   DCHECK(!picture_);
  54   picture_ = skia::AdoptRef(new SkPicture);
  55
  56   // TODO(enne): Use SkPicture::kOptimizeForClippedPlayback_RecordingFlag
  57   // once http://code.google.com/p/skia/issues/detail?id=1014 is fixed.
  58   SkCanvas* canvas = picture_->beginRecording(
  59       layer_rect_.width(),
  60       layer_rect_.height(),
  61       SkPicture::kUsePathBoundsForClip_RecordingFlag);
  62
  63   canvas->save();
  64   canvas->translate(SkFloatToScalar(-layer_rect_.x()),
  65                     SkFloatToScalar(-layer_rect_.y()));
  66
  67   SkPaint paint;
  68   paint.setAntiAlias(false);
  69   paint.setXfermodeMode(SkXfermode::kClear_Mode);
  70   SkRect layer_skrect = SkRect::MakeXYWH(layer_rect_.x(),
  71                                          layer_rect_.y(),
  72                                          layer_rect_.width(),
  73                                          layer_rect_.height());
  74   canvas->clipRect(layer_skrect);
  75   canvas->drawRect(layer_skrect, paint);
  76
  77   gfx::RectF opaque_layer_rect;
  78   base::TimeTicks beginPaintTime = base::TimeTicks::Now();
  79   painter->paintContents(canvas, layer_rect_, opaque_layer_rect);
  80   double delta = (base::TimeTicks::Now() - beginPaintTime).InSecondsF();
  81   stats.totalPaintTimeInSeconds += delta;
  82   stats.totalPixelsPainted += layer_rect_.width() *
  83                               layer_rect_.height();
  84
  85   canvas->restore();
  86   picture_->endRecording();
  87
  88   opaque_rect_ = gfx::ToEnclosedRect(opaque_layer_rect);
  89 }
  90
  91 void Picture::Raster(SkCanvas* canvas) {
  92   TRACE_EVENT0("cc", "Picture::Raster");
  93   DCHECK(picture_);
  94   canvas->save();
  95   canvas->translate(layer_rect_.x(), layer_rect_.y());
  96   canvas->drawPicture(*picture_);
  97   canvas->restore();
  98 }
  99
 100 void Picture::GatherPixelRefs(const gfx::Rect& rect,
 101                               std::list<skia::LazyPixelRef*>& result) {
 102   DCHECK(picture_);
 103   SkData* pixel_refs = SkPictureUtils::GatherPixelRefs(
 104       picture_.get(), SkRect::MakeXYWH(rect.x(),
 105                                        rect.y(),
 106                                        rect.width(),
 107                                        rect.height()));
 108   if (!pixel_refs)
 109     return;
 110
 111   void* data = const_cast<void*>(pixel_refs->data());
 112   if (!data) {
 113     pixel_refs->unref();
 114     return;
 115   }
 116
 117   SkPixelRef** refs = reinterpret_cast<SkPixelRef**>(data);
 118   for (unsigned int i = 0; i < pixel_refs->size() / sizeof(SkPixelRef*); ++i) {
 119     if (*refs && (*refs)->getURI() && !strncmp(
 120         (*refs)->getURI(), labelLazyDecoded, 4)) {
 121       result.push_back(static_cast<skia::LazyPixelRef*>(*refs));
 122     }
 123     refs++;
 124   }
 125   pixel_refs->unref();
 126 }
 127
 128 }  // namespace cc