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// Copyright 2014 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 "base/macros.h"
#include "base/memory/ref_counted_memory.h"
#include "base/memory/scoped_ptr.h"
#include "base/memory/weak_ptr.h"
#include "ui/gfx/image/image_skia.h"
namespace views {
class WebView;
namespace athena {
class ProxyImageData;
// This object creates and holds proxy content which gets shown instead of the
// actual web content, generated from the passed |web_view|.
// The created |proxy_content_| will be destroyed with the destruction of this
// object.
// Calling EvictContent() will release the rendered content.
// When ContentGetsDestroyed() gets called, the old view will be made visible
// and then the link to the |web_view_| will get severed.
class ContentProxy {
// Creates the object by creating a sized down |web_view| layer.
explicit ContentProxy(views::WebView* web_view);
// TODO(skuhne): Add a function to create this object from a passed PNG, so
// that we can create it from a session restore.
// With the destruction of the object, the layer should get destroyed and the
// content should become visible again.
virtual ~ContentProxy();
// Called when the content will get unloaded.
void ContentWillUnload();
// Can be called to save resources by creating a layer with a solid color
// instead of creating a content image layer.
// Note: Currently the GPU does create a full size texture and fills it with
// the given color - so there isn't really memory savings yet.
void EvictContent();
// Get the image of the content. If there is no image known, an empty image
// will be returned.
gfx::ImageSkia GetContentImage();
// The content is about to get destroyed by its creator.
// Note: This function should only be used by AppActivity.
void OnPreContentDestroyed();
// Make the original (web)content visible. This call should only be paired
// with HideOriginalContent.
void ShowOriginalContent();
// Make the content invisible. This call should only be paired with
// MakeVisible.
void HideOriginalContent();
// Creates proxy content from |web_view_|.
void CreateProxyContent();
// Creates an image from the current content.
bool CreateContentImage();
// Called once the content was read back.
void OnContentImageRead(bool success, const SkBitmap& bitmap);
// Called once the image content has been converted to PNG.
void OnContentImageEncodeComplete(scoped_refptr<ProxyImageData> image);
// The web view which was passed on creation and is associated with this
// object. It will be shown when OnPreContentDestroyed() gets called and then
// set to nullptr. The ownership remains with the creator.
views::WebView* web_view_;
// While we are doing our PNG encode, we keep the read back image to have
// something which we can pass back to the overview mode. (It would make no
// sense to the user to see that more recent windows get painted later than
// older ones).
gfx::ImageSkia raw_image_;
// True if the content is visible.
bool content_visible_;
// True if the content is loaded and needs a re-layout when it gets shown
// again.
bool content_loaded_;
// True if a content creation was kicked off once. This ensures that the
// function is never called twice.
bool content_creation_called_;
// The PNG image data.
scoped_refptr<base::RefCountedBytes> png_data_;
// Creating an encoded image from the content will be asynchronous. Use a
// weakptr for the callback to make sure that the read back / encoding image
// completion callback does not trigger on a destroyed ContentProxy.
base::WeakPtrFactory<ContentProxy> proxy_content_to_image_factory_;
} // namespace athena