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// Copyright 2012 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/layers/contents_scaling_layer.h"
#include "cc/trees/layer_tree_host.h"
#include "ui/gfx/geometry/size_conversions.h"
namespace cc {
gfx::Size ContentsScalingLayer::ComputeContentBoundsForScale(
float scale_x,
float scale_y) const {
return gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scale_x, scale_y));
}
ContentsScalingLayer::ContentsScalingLayer()
: last_update_contents_scale_x_(0.f),
last_update_contents_scale_y_(0.f) {}
ContentsScalingLayer::~ContentsScalingLayer() {
}
void ContentsScalingLayer::CalculateContentsScale(
float ideal_contents_scale,
float* contents_scale_x,
float* contents_scale_y,
gfx::Size* content_bounds) {
float old_contents_scale_x = *contents_scale_x;
float old_contents_scale_y = *contents_scale_y;
gfx::Size old_content_bounds = *content_bounds;
*contents_scale_x = ideal_contents_scale;
*contents_scale_y = ideal_contents_scale;
*content_bounds = ComputeContentBoundsForScale(
ideal_contents_scale,
ideal_contents_scale);
if (!layer_tree_host())
return;
if (old_contents_scale_x != *contents_scale_x ||
old_contents_scale_y != *contents_scale_y ||
old_content_bounds != *content_bounds) {
layer_tree_host()->property_trees()->needs_rebuild = true;
}
}
bool ContentsScalingLayer::Update(ResourceUpdateQueue* queue,
const OcclusionTracker<Layer>* occlusion) {
bool updated = Layer::Update(queue, occlusion);
if (draw_properties().contents_scale_x == last_update_contents_scale_x_ &&
draw_properties().contents_scale_y == last_update_contents_scale_y_)
return updated;
last_update_contents_scale_x_ = draw_properties().contents_scale_x;
last_update_contents_scale_y_ = draw_properties().contents_scale_y;
// Invalidate the whole layer if scale changed.
SetNeedsDisplayRect(gfx::Rect(paint_properties().bounds));
return updated;
}
} // namespace cc
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