1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
|
// Copyright 2024 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_LENS_LENS_OVERLAY_BLUR_LAYER_DELEGATE_H_
#define CHROME_BROWSER_UI_LENS_LENS_OVERLAY_BLUR_LAYER_DELEGATE_H_
#include "base/memory/weak_ptr.h"
#include "base/scoped_observation.h"
#include "base/timer/timer.h"
#include "content/public/browser/render_widget_host.h"
#include "content/public/browser/render_widget_host_observer.h"
#include "content/public/browser/render_widget_host_view.h"
#include "third_party/skia/include/core/SkBitmap.h"
#include "ui/compositor/layer.h"
#include "ui/compositor/layer_delegate.h"
#include "ui/compositor/layer_owner.h"
#include "ui/compositor/paint_context.h"
namespace lens {
// LayerDelegate for controlling the background blur behind the overlay. This
// class is only a LayerDelegate to control the layer painting and does not own
// the layer.
class LensOverlayBlurLayerDelegate : public ui::LayerOwner,
public ui::LayerDelegate,
public content::RenderWidgetHostObserver {
public:
// Creates a layer and starts painting to it with a blurred background image
// using the given render view as the background. Note: Initializing this
// class does not start capturing screenshots of the background view until
// StartBackgroundImageCapture(). Meaning, until StartBackgroundImageCapture,
// this layer will paint a static blurred image that was taken on
// initialization.
explicit LensOverlayBlurLayerDelegate(
content::RenderWidgetHost* background_view_host);
~LensOverlayBlurLayerDelegate() override;
// Starts taking screenshots of the background view to use for blurring.
void StartBackgroundImageCapture();
// Pauses taking screenshots of the background view. When paused, the layer
// will still be blurred, but it will be a static blur that does not update.
// When the page resizes, it will stretch the last taken screenshot to fit the
// new layer size.
void StopBackgroundImageCapture();
private:
// ui::LayerDelegate:
void OnPaintLayer(const ui::PaintContext& context) override;
void OnDeviceScaleFactorChanged(float old_device_scale_factor,
float new_device_scale_factor) override;
// content::RenderWidgetHostObserver:
void RenderWidgetHostDestroyed(
content::RenderWidgetHost* widget_host) override;
// Fetches a new background screenshot to use for blurring.
void FetchBackgroundImage();
// Updates background_screenshot_ to the new bitmap and rerenders IFF bitmap
// is visually different than background_screenshot_.
void UpdateBackgroundImage(const SkBitmap& bitmap);
// The latest screenshot being used to render the background.
SkBitmap background_screenshot_;
// A timer to periodically take screenshots of the underlying page.
base::RepeatingTimer screenshot_timer_;
// Pointer to the RenderWidgetHost to get the contents which we are
// blurring. Owned by the live page web contents, so is possible to become
// null.
raw_ptr<content::RenderWidgetHost> background_view_host_;
// Observes the RenderWidgetHost to ensure our pointer stays valid.
base::ScopedObservation<content::RenderWidgetHost,
content::RenderWidgetHostObserver>
render_widget_host_observer_{this};
// Must be the last member.
base::WeakPtrFactory<LensOverlayBlurLayerDelegate> weak_factory_{this};
};
} // namespace lens
#endif // CHROME_BROWSER_UI_LENS_LENS_OVERLAY_BLUR_LAYER_DELEGATE_H_
|
