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| 1 /* |
| 2 * Copyright (c) 2016 The WebRTC project authors. All Rights Reserved. |
| 3 * |
| 4 * Use of this source code is governed by a BSD-style license |
| 5 * that can be found in the LICENSE file in the root of the source |
| 6 * tree. An additional intellectual property rights grant can be found |
| 7 * in the file PATENTS. All contributing project authors may |
| 8 * be found in the AUTHORS file in the root of the source tree. |
| 9 */ |
| 10 |
| 11 #ifndef WEBRTC_MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_GENERATOR_H_ |
| 12 #define WEBRTC_MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_GENERATOR_H_ |
| 13 |
| 14 #include <memory> |
| 15 |
| 16 #include "webrtc/modules/desktop_capture/desktop_frame.h" |
| 17 #include "webrtc/modules/desktop_capture/desktop_geometry.h" |
| 18 #include "webrtc/modules/desktop_capture/desktop_region.h" |
| 19 #include "webrtc/modules/desktop_capture/shared_memory.h" |
| 20 |
| 21 namespace webrtc { |
| 22 |
| 23 // An interface to generate a DesktopFrame. |
| 24 class DesktopFrameGenerator { |
| 25 public: |
| 26 DesktopFrameGenerator(); |
| 27 virtual ~DesktopFrameGenerator(); |
| 28 |
| 29 virtual std::unique_ptr<DesktopFrame> GetNextFrame( |
| 30 SharedMemoryFactory* factory) = 0; |
| 31 }; |
| 32 |
| 33 // An interface to paint a DesktopFrame. This interface is used by |
| 34 // PainterDesktopFrameGenerator. |
| 35 class DesktopFramePainter { |
| 36 public: |
| 37 DesktopFramePainter(); |
| 38 virtual ~DesktopFramePainter(); |
| 39 |
| 40 virtual bool Paint(DesktopFrame* frame, DesktopRegion* updated_region) = 0; |
| 41 }; |
| 42 |
| 43 // An implementation of DesktopFrameGenerator to take care about the |
| 44 // DesktopFrame size, filling updated_region(), etc, but leaves the real |
| 45 // painting work to a DesktopFramePainter implementation. |
| 46 class PainterDesktopFrameGenerator final : public DesktopFrameGenerator { |
| 47 public: |
| 48 PainterDesktopFrameGenerator(); |
| 49 ~PainterDesktopFrameGenerator() override; |
| 50 |
| 51 std::unique_ptr<DesktopFrame> GetNextFrame( |
| 52 SharedMemoryFactory* factory) override; |
| 53 |
| 54 // Sets the size of the frame which will be returned in next GetNextFrame() |
| 55 // call. |
| 56 DesktopSize* size(); |
| 57 |
| 58 // Decides whether BaseDesktopFrameGenerator returns a frame in next Capture() |
| 59 // callback. If return_frame_ is true, BaseDesktopFrameGenerator will create a |
| 60 // frame according to both size_ and SharedMemoryFactory input, and uses |
| 61 // Paint() function to paint it. |
| 62 void set_return_frame(bool return_frame); |
| 63 |
| 64 // Decides whether MockScreenCapturer returns a frame with updated regions. |
| 65 // MockScreenCapturer will keep DesktopFrame::updated_region() empty if this |
| 66 // field is false. |
| 67 void set_provide_updated_region_hints(bool provide_updated_region_hints); |
| 68 |
| 69 // Decides whether MockScreenCapturer randomly enlarges updated regions in the |
| 70 // DesktopFrame. Set this field to true to simulate an inaccurate updated |
| 71 // regions' return from OS APIs. |
| 72 void set_enlarge_updated_region(bool enlarge_updated_region); |
| 73 |
| 74 // The range to enlarge a updated region if |enlarge_updated_region_| is true. |
| 75 // If this field is less than zero, it will be treated as zero, and |
| 76 // |enlarge_updated_region_| will be ignored. |
| 77 void set_enlarge_range(int enlarge_range); |
| 78 |
| 79 // Decides whether BaseDesktopFrameGenerator randomly add some updated regions |
| 80 // in the DesktopFrame. Set this field to true to simulate an inaccurate |
| 81 // updated regions' return from OS APIs. |
| 82 void set_add_random_updated_region(bool add_random_updated_region); |
| 83 |
| 84 // Sets the painter object to do the real painting work, if no |painter_| has |
| 85 // been set to this instance, the DesktopFrame returned by GetNextFrame() |
| 86 // function will keep in an undefined but valid state. |
| 87 // PainterDesktopFrameGenerator does not take ownership of the |painter|. |
| 88 void set_desktop_frame_painter(DesktopFramePainter* painter); |
| 89 |
| 90 private: |
| 91 DesktopSize size_; |
| 92 bool return_frame_; |
| 93 bool provide_updated_region_hints_; |
| 94 bool enlarge_updated_region_; |
| 95 int enlarge_range_; |
| 96 bool add_random_updated_region_; |
| 97 DesktopFramePainter* painter_; |
| 98 }; |
| 99 |
| 100 // An implementation of DesktopFramePainter to paint black on |
| 101 // mutable_updated_region(), and white elsewhere. |
| 102 class BlackWhiteDesktopFramePainter final : public DesktopFramePainter { |
| 103 public: |
| 104 BlackWhiteDesktopFramePainter(); |
| 105 ~BlackWhiteDesktopFramePainter() override; |
| 106 |
| 107 // The black regions of the frame which will be returned in next Paint() |
| 108 // call. BlackWhiteDesktopFramePainter will draw a white frame, with black |
| 109 // in the updated_region_. Each Paint() call will consume updated_region_. |
| 110 DesktopRegion* updated_region(); |
| 111 |
| 112 // DesktopFramePainter interface. |
| 113 bool Paint(DesktopFrame* frame, DesktopRegion* updated_region) override; |
| 114 |
| 115 private: |
| 116 DesktopRegion updated_region_; |
| 117 }; |
| 118 |
| 119 } // namespace webrtc |
| 120 |
| 121 #endif // WEBRTC_MODULES_DESKTOP_CAPTURE_DESKTOP_FRAME_GENERATOR_H_ |
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