image_layer.cc revision b2df76ea8fec9e32f6f3718986dba0d95315b29c
1// Copyright 2010 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/image_layer.h" 6 7#include "base/compiler_specific.h" 8#include "cc/resources/image_layer_updater.h" 9#include "cc/resources/layer_updater.h" 10#include "cc/resources/prioritized_resource.h" 11#include "cc/resources/resource_update_queue.h" 12#include "cc/trees/layer_tree_host.h" 13 14namespace cc { 15 16scoped_refptr<ImageLayer> ImageLayer::Create() { 17 return make_scoped_refptr(new ImageLayer()); 18} 19 20ImageLayer::ImageLayer() : TiledLayer() {} 21 22ImageLayer::~ImageLayer() {} 23 24void ImageLayer::SetBitmap(const SkBitmap& bitmap) { 25 // SetBitmap() currently gets called whenever there is any 26 // style change that affects the layer even if that change doesn't 27 // affect the actual contents of the image (e.g. a CSS animation). 28 // With this check in place we avoid unecessary texture uploads. 29 if (bitmap.pixelRef() && bitmap.pixelRef() == bitmap_.pixelRef()) 30 return; 31 32 bitmap_ = bitmap; 33 SetNeedsDisplay(); 34} 35 36void ImageLayer::SetTexturePriorities(const PriorityCalculator& priority_calc) { 37 // Update the tile data before creating all the layer's tiles. 38 UpdateTileSizeAndTilingOption(); 39 40 TiledLayer::SetTexturePriorities(priority_calc); 41} 42 43void ImageLayer::Update(ResourceUpdateQueue* queue, 44 const OcclusionTracker* occlusion, 45 RenderingStats* stats) { 46 CreateUpdaterIfNeeded(); 47 if (needs_display_) { 48 updater_->set_bitmap(bitmap_); 49 UpdateTileSizeAndTilingOption(); 50 InvalidateContentRect(gfx::Rect(content_bounds())); 51 needs_display_ = false; 52 } 53 TiledLayer::Update(queue, occlusion, stats); 54} 55 56void ImageLayer::CreateUpdaterIfNeeded() { 57 if (updater_) 58 return; 59 60 updater_ = ImageLayerUpdater::Create(); 61 GLenum texture_format = 62 layer_tree_host()->GetRendererCapabilities().best_texture_format; 63 SetTextureFormat(texture_format); 64} 65 66LayerUpdater* ImageLayer::Updater() const { 67 return updater_.get(); 68} 69 70void ImageLayer::CalculateContentsScale(float ideal_contents_scale, 71 float device_scale_factor, 72 float page_scale_factor, 73 bool animating_transform_to_screen, 74 float* contents_scale_x, 75 float* contents_scale_y, 76 gfx::Size* content_bounds) { 77 *contents_scale_x = ImageContentsScaleX(); 78 *contents_scale_y = ImageContentsScaleY(); 79 *content_bounds = gfx::Size(bitmap_.width(), bitmap_.height()); 80} 81 82bool ImageLayer::DrawsContent() const { 83 return !bitmap_.isNull() && TiledLayer::DrawsContent(); 84} 85 86float ImageLayer::ImageContentsScaleX() const { 87 if (bounds().IsEmpty() || bitmap_.width() == 0) 88 return 1; 89 return static_cast<float>(bitmap_.width()) / bounds().width(); 90} 91 92float ImageLayer::ImageContentsScaleY() const { 93 if (bounds().IsEmpty() || bitmap_.height() == 0) 94 return 1; 95 return static_cast<float>(bitmap_.height()) / bounds().height(); 96} 97 98} // namespace cc 99