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      1 // Copyright 2014 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 "base/logging.h"
      6 #include "chrome/browser/android/thumbnail/thumbnail.h"
      7 #include "content/public/browser/android/ui_resource_provider.h"
      8 #include "third_party/skia/include/core/SkBitmap.h"
      9 #include "third_party/skia/include/core/SkCanvas.h"
     10 #include "ui/gfx/geometry/size_conversions.h"
     11 
     12 namespace {
     13 
     14 SkBitmap CreateSmallHolderBitmap() {
     15   SkBitmap small_bitmap;
     16   SkCanvas canvas(small_bitmap);
     17   small_bitmap.allocPixels(
     18       SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kOpaque_SkAlphaType));
     19   canvas.drawColor(SK_ColorWHITE);
     20   small_bitmap.setImmutable();
     21   return small_bitmap;
     22 }
     23 
     24 }  // anonymous namespace
     25 
     26 scoped_ptr<Thumbnail> Thumbnail::Create(
     27     TabId tab_id,
     28     const base::Time& time_stamp,
     29     float scale,
     30     content::UIResourceProvider* ui_resource_provider,
     31     ThumbnailDelegate* thumbnail_delegate) {
     32   return make_scoped_ptr(new Thumbnail(
     33       tab_id, time_stamp, scale, ui_resource_provider, thumbnail_delegate));
     34 }
     35 
     36 Thumbnail::Thumbnail(TabId tab_id,
     37                      const base::Time& time_stamp,
     38                      float scale,
     39                      content::UIResourceProvider* ui_resource_provider,
     40                      ThumbnailDelegate* thumbnail_delegate)
     41     : tab_id_(tab_id),
     42       time_stamp_(time_stamp),
     43       scale_(scale),
     44       bitmap_(gfx::Size(1, 1), true),
     45       ui_resource_id_(0),
     46       retrieved_(false),
     47       ui_resource_provider_(ui_resource_provider),
     48       thumbnail_delegate_(thumbnail_delegate) {
     49 }
     50 
     51 Thumbnail::~Thumbnail() {
     52   ClearUIResourceId();
     53 }
     54 
     55 void Thumbnail::SetBitmap(const SkBitmap& bitmap) {
     56   DCHECK(!bitmap.empty());
     57   ClearUIResourceId();
     58   scaled_content_size_ =
     59       gfx::ScaleSize(gfx::Size(bitmap.width(), bitmap.height()), 1.f / scale_);
     60   scaled_data_size_ = scaled_content_size_;
     61   bitmap_ = cc::UIResourceBitmap(bitmap);
     62 }
     63 
     64 void Thumbnail::SetCompressedBitmap(skia::RefPtr<SkPixelRef> compressed_bitmap,
     65                                     const gfx::Size& content_size) {
     66   DCHECK(compressed_bitmap);
     67   DCHECK(!content_size.IsEmpty());
     68   ClearUIResourceId();
     69   gfx::Size data_size(compressed_bitmap->info().width(),
     70                       compressed_bitmap->info().height());
     71   scaled_content_size_ = gfx::ScaleSize(content_size, 1.f / scale_);
     72   scaled_data_size_ = gfx::ScaleSize(data_size, 1.f / scale_);
     73   bitmap_ = cc::UIResourceBitmap(compressed_bitmap, data_size);
     74 }
     75 
     76 void Thumbnail::CreateUIResource() {
     77   DCHECK(ui_resource_provider_);
     78   if (!ui_resource_id_)
     79     ui_resource_id_ = ui_resource_provider_->CreateUIResource(this);
     80 }
     81 
     82 cc::UIResourceBitmap Thumbnail::GetBitmap(cc::UIResourceId uid,
     83                                           bool resource_lost) {
     84   if (retrieved_)
     85     return bitmap_;
     86 
     87   retrieved_ = true;
     88 
     89   cc::UIResourceBitmap old_bitmap(bitmap_);
     90   // Return a place holder for all other calls to GetBitmap.
     91   bitmap_ = cc::UIResourceBitmap(CreateSmallHolderBitmap());
     92   return old_bitmap;
     93 }
     94 
     95 void Thumbnail::UIResourceIsInvalid() {
     96   ui_resource_id_ = 0;
     97   if (thumbnail_delegate_)
     98     thumbnail_delegate_->InvalidateCachedThumbnail(this);
     99 }
    100 
    101 void Thumbnail::ClearUIResourceId() {
    102   if (ui_resource_id_ && ui_resource_provider_)
    103     ui_resource_provider_->DeleteUIResource(ui_resource_id_);
    104   ui_resource_id_ = 0;
    105 }
    106