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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.h"
#include "cc/debug/rendering_stats.h"
#include "cc/resources/layer_painter.h"
#include "third_party/skia/include/core/SkCanvas.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)
: painter_(painter.Pass()) {}
ContentLayerUpdater::~ContentLayerUpdater() {}
void ContentLayerUpdater::PaintContents(SkCanvas* canvas,
gfx::Rect content_rect,
float contents_width_scale,
float contents_height_scale,
gfx::Rect* resulting_opaque_rect,
RenderingStats* stats) {
TRACE_EVENT0("cc", "ContentLayerUpdater::PaintContents");
canvas->save();
canvas->translate(SkFloatToScalar(-content_rect.x()),
SkFloatToScalar(-content_rect.y()));
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));
gfx::RectF rect = gfx::ScaleRect(
content_rect, 1.f / contents_width_scale, 1.f / contents_height_scale);
layer_rect = gfx::ToEnclosingRect(rect);
}
SkPaint paint;
paint.setAntiAlias(false);
paint.setXfermodeMode(SkXfermode::kClear_Mode);
SkRect layer_sk_rect = SkRect::MakeXYWH(
layer_rect.x(), layer_rect.y(), layer_rect.width(), layer_rect.height());
canvas->drawRect(layer_sk_rect, paint);
canvas->clipRect(layer_sk_rect);
gfx::RectF opaque_layer_rect;
base::TimeTicks paint_begin_time;
if (stats)
paint_begin_time = base::TimeTicks::Now();
painter_->Paint(canvas, layer_rect, &opaque_layer_rect);
if (stats) {
stats->total_paint_time += base::TimeTicks::Now() - paint_begin_time;
stats->total_pixels_painted += content_rect.width() * content_rect.height();
}
canvas->restore();
gfx::RectF opaque_content_rect = gfx::ScaleRect(
opaque_layer_rect, contents_width_scale, contents_height_scale);
*resulting_opaque_rect = gfx::ToEnclosedRect(opaque_content_rect);
content_rect_ = content_rect;
}
} // namespace cc
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