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/content_layer_updater.h"
6
7#include "base/debug/trace_event.h"
8#include "base/time/time.h"
9#include "cc/debug/rendering_stats_instrumentation.h"
10#include "cc/resources/layer_painter.h"
11#include "third_party/skia/include/core/SkCanvas.h"
12#include "third_party/skia/include/core/SkDevice.h"
13#include "third_party/skia/include/core/SkPaint.h"
14#include "third_party/skia/include/core/SkRect.h"
15#include "third_party/skia/include/core/SkScalar.h"
16#include "ui/gfx/rect_conversions.h"
17#include "ui/gfx/rect_f.h"
18
19namespace cc {
20
21ContentLayerUpdater::ContentLayerUpdater(
22    scoped_ptr<LayerPainter> painter,
23    RenderingStatsInstrumentation* stats_instrumentation,
24    int layer_id)
25    : rendering_stats_instrumentation_(stats_instrumentation),
26      layer_id_(layer_id),
27      painter_(painter.Pass()),
28      layer_is_opaque_(false) {}
29
30ContentLayerUpdater::~ContentLayerUpdater() {}
31
32void ContentLayerUpdater::set_rendering_stats_instrumentation(
33    RenderingStatsInstrumentation* rsi) {
34  rendering_stats_instrumentation_ = rsi;
35}
36
37void ContentLayerUpdater::PaintContents(SkCanvas* canvas,
38                                        gfx::Point origin,
39                                        float contents_width_scale,
40                                        float contents_height_scale,
41                                        gfx::Rect* resulting_opaque_rect) {
42  TRACE_EVENT0("cc", "ContentLayerUpdater::PaintContents");
43  canvas->save();
44  canvas->translate(SkFloatToScalar(-origin.x()),
45                    SkFloatToScalar(-origin.y()));
46
47  SkBaseDevice* device = canvas->getDevice();
48  gfx::Rect content_rect(origin, gfx::Size(device->width(), device->height()));
49
50  gfx::Rect layer_rect = content_rect;
51
52  if (contents_width_scale != 1.f || contents_height_scale != 1.f) {
53    canvas->scale(SkFloatToScalar(contents_width_scale),
54                  SkFloatToScalar(contents_height_scale));
55
56    layer_rect = gfx::ScaleToEnclosingRect(
57        content_rect, 1.f / contents_width_scale, 1.f / contents_height_scale);
58  }
59
60  SkRect layer_sk_rect = SkRect::MakeXYWH(
61      layer_rect.x(), layer_rect.y(), layer_rect.width(), layer_rect.height());
62
63  canvas->clipRect(layer_sk_rect);
64
65  // If the layer has opaque contents then there is no need to
66  // clear the canvas before painting.
67  if (!layer_is_opaque_) {
68    TRACE_EVENT0("cc", "Clear");
69    canvas->drawColor(SK_ColorTRANSPARENT, SkXfermode::kSrc_Mode);
70  }
71
72  gfx::RectF opaque_layer_rect;
73  painter_->Paint(canvas, layer_rect, &opaque_layer_rect);
74  canvas->restore();
75
76  gfx::Rect opaque_content_rect = gfx::ToEnclosedRect(gfx::ScaleRect(
77      opaque_layer_rect, contents_width_scale, contents_height_scale));
78  *resulting_opaque_rect = opaque_content_rect;
79
80  content_rect_ = content_rect;
81}
82
83void ContentLayerUpdater::SetOpaque(bool opaque) {
84  layer_is_opaque_ = opaque;
85}
86
87}  // namespace cc
88