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// Copyright 2011 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "cc/resources/content_layer_updater.h"
#include "base/debug/trace_event.h"
#include "base/time/time.h"
#include "cc/debug/rendering_stats_instrumentation.h"
#include "cc/resources/layer_painter.h"
#include "third_party/skia/include/core/SkCanvas.h"
#include "third_party/skia/include/core/SkDevice.h"
#include "third_party/skia/include/core/SkPaint.h"
#include "third_party/skia/include/core/SkRect.h"
#include "third_party/skia/include/core/SkScalar.h"
#include "ui/gfx/rect_conversions.h"
#include "ui/gfx/rect_f.h"
namespace cc {
ContentLayerUpdater::ContentLayerUpdater(
scoped_ptr<LayerPainter> painter,
RenderingStatsInstrumentation* stats_instrumentation,
int layer_id)
: rendering_stats_instrumentation_(stats_instrumentation),
layer_id_(layer_id),
painter_(painter.Pass()),
layer_is_opaque_(false) {}
ContentLayerUpdater::~ContentLayerUpdater() {}
void ContentLayerUpdater::set_rendering_stats_instrumentation(
RenderingStatsInstrumentation* rsi) {
rendering_stats_instrumentation_ = rsi;
}
void ContentLayerUpdater::PaintContents(SkCanvas* canvas,
gfx::Point origin,
float contents_width_scale,
float contents_height_scale,
gfx::Rect* resulting_opaque_rect) {
TRACE_EVENT0("cc", "ContentLayerUpdater::PaintContents");
canvas->save();
canvas->translate(SkFloatToScalar(-origin.x()),
SkFloatToScalar(-origin.y()));
SkBaseDevice* device = canvas->getDevice();
gfx::Rect content_rect(origin, gfx::Size(device->width(), device->height()));
gfx::Rect layer_rect = content_rect;
if (contents_width_scale != 1.f || contents_height_scale != 1.f) {
canvas->scale(SkFloatToScalar(contents_width_scale),
SkFloatToScalar(contents_height_scale));
layer_rect = gfx::ScaleToEnclosingRect(
content_rect, 1.f / contents_width_scale, 1.f / contents_height_scale);
}
SkRect layer_sk_rect = SkRect::MakeXYWH(
layer_rect.x(), layer_rect.y(), layer_rect.width(), layer_rect.height());
canvas->clipRect(layer_sk_rect);
// If the layer has opaque contents then there is no need to
// clear the canvas before painting.
if (!layer_is_opaque_) {
TRACE_EVENT0("cc", "Clear");
canvas->drawColor(SK_ColorTRANSPARENT, SkXfermode::kSrc_Mode);
}
gfx::RectF opaque_layer_rect;
painter_->Paint(canvas, layer_rect, &opaque_layer_rect);
canvas->restore();
gfx::Rect opaque_content_rect = gfx::ToEnclosedRect(gfx::ScaleRect(
opaque_layer_rect, contents_width_scale, contents_height_scale));
*resulting_opaque_rect = opaque_content_rect;
content_rect_ = content_rect;
}
void ContentLayerUpdater::SetOpaque(bool opaque) {
layer_is_opaque_ = opaque;
}
} // namespace cc
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