1 // Copyright 2012 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/layers/contents_scaling_layer.h" 6 #include "ui/gfx/size_conversions.h" 7 8 namespace cc { 9 10 gfx::Size ContentsScalingLayer::ComputeContentBoundsForScale( 11 float scale_x, 12 float scale_y) const { 13 return gfx::ToCeiledSize(gfx::ScaleSize(bounds(), scale_x, scale_y)); 14 } 15 16 ContentsScalingLayer::ContentsScalingLayer() 17 : last_update_contents_scale_x_(0.f), 18 last_update_contents_scale_y_(0.f) {} 19 20 ContentsScalingLayer::~ContentsScalingLayer() { 21 } 22 23 void ContentsScalingLayer::CalculateContentsScale( 24 float ideal_contents_scale, 25 float device_scale_factor, 26 float page_scale_factor, 27 bool animating_transform_to_screen, 28 float* contents_scale_x, 29 float* contents_scale_y, 30 gfx::Size* content_bounds) { 31 *contents_scale_x = ideal_contents_scale; 32 *contents_scale_y = ideal_contents_scale; 33 *content_bounds = ComputeContentBoundsForScale( 34 ideal_contents_scale, 35 ideal_contents_scale); 36 } 37 38 bool ContentsScalingLayer::Update( 39 ResourceUpdateQueue* queue, 40 const OcclusionTracker* occlusion) { 41 bool updated = Layer::Update(queue, occlusion); 42 43 if (draw_properties().contents_scale_x == last_update_contents_scale_x_ && 44 draw_properties().contents_scale_y == last_update_contents_scale_y_) 45 return updated; 46 47 last_update_contents_scale_x_ = draw_properties().contents_scale_x; 48 last_update_contents_scale_y_ = draw_properties().contents_scale_y; 49 // Invalidate the whole layer if scale changed. 50 SetNeedsDisplayRect(gfx::Rect(paint_properties().bounds)); 51 return updated; 52 } 53 54 } // namespace cc 55
