cc/resources/skpicture_content_layer_updater.cc

   1 // Copyright 2011 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/resources/skpicture_content_layer_updater.h"
   6
   7 #include "base/trace_event/trace_event.h"
   8 #include "cc/debug/rendering_stats_instrumentation.h"
   9 #include "cc/resources/layer_painter.h"
  10 #include "cc/resources/prioritized_resource.h"
  11 #include "cc/resources/resource_update_queue.h"
  12 #include "third_party/skia/include/core/SkCanvas.h"
  13 #include "third_party/skia/include/core/SkPictureRecorder.h"
  14
  15 namespace cc {
  16
  17 SkPictureContentLayerUpdater::SkPictureContentLayerUpdater(
  18     scoped_ptr<LayerPainter> painter,
  19     int layer_id)
  20     : ContentLayerUpdater(painter.Pass(), layer_id) {
  21 }
  22
  23 SkPictureContentLayerUpdater::~SkPictureContentLayerUpdater() {}
  24
  25 void SkPictureContentLayerUpdater::PrepareToUpdate(
  26     const gfx::Size& content_size,
  27     const gfx::Rect& paint_rect,
  28     const gfx::Size& tile_size,
  29     float contents_width_scale,
  30     float contents_height_scale) {
  31   SkPictureRecorder recorder;
  32   SkCanvas* canvas =
  33       recorder.beginRecording(paint_rect.width(), paint_rect.height(), NULL, 0);
  34   DCHECK_EQ(paint_rect.width(), canvas->getBaseLayerSize().width());
  35   DCHECK_EQ(paint_rect.height(), canvas->getBaseLayerSize().height());
  36   PaintContents(canvas,
  37                 content_size,
  38                 paint_rect,
  39                 contents_width_scale,
  40                 contents_height_scale);
  41   picture_ = skia::AdoptRef(recorder.endRecordingAsPicture());
  42 }
  43
  44 void SkPictureContentLayerUpdater::DrawPicture(SkCanvas* canvas) {
  45   TRACE_EVENT0("cc", "SkPictureContentLayerUpdater::DrawPicture");
  46   if (picture_)
  47     canvas->drawPicture(picture_.get());
  48 }
  49
  50 }  // namespace cc