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91 lines
2.4 KiB
C++
91 lines
2.4 KiB
C++
#pragma once
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// BCM includes
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#pragma GCC system_header
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#include <bcm_host.h>
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// STL includes
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#include <cstdint>
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// Utils includes
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#include <utils/Image.h>
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#include <utils/ColorRgba.h>
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#include <utils/VideoMode.h>
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#include <utils/Logger.h>
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///
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/// The DispmanxFrameGrabber is used for creating snapshots of the display (screenshots) with a
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/// downsized and scaled resolution.
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///
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class DispmanxFrameGrabber
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{
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public:
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///
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/// Construct a DispmanxFrameGrabber that will capture snapshots with specified dimensions.
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///
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/// @param[in] width The width of the captured screenshot
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/// @param[in] height The heigth of the captured screenshot
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///
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DispmanxFrameGrabber(const unsigned width, const unsigned height);
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~DispmanxFrameGrabber();
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///
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/// Updates the frame-grab flags as used by the VC library for frame grabbing
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///
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/// @param vc_flags The snapshot grabbing mask
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///
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void setFlags(const int vc_flags);
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///
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/// Set the video mode (2D/3D)
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/// @param[in] mode The new video mode
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///
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void setVideoMode(const VideoMode videoMode);
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void setCropping(const unsigned cropLeft, const unsigned cropRight,
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const unsigned cropTop, const unsigned cropBottom);
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///
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/// Captures a single snapshot of the display and writes the data to the given image. The
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/// provided image should have the same dimensions as the configured values (_width and
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/// _height)
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///
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/// @param[out] image The snapped screenshot (should be initialized with correct width and
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/// height)
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///
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void grabFrame(Image<ColorRgba> & image);
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private:
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/// Handle to the display that is being captured
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DISPMANX_DISPLAY_HANDLE_T _vc_display;
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/// Handle to the resource for storing the captured snapshot
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DISPMANX_RESOURCE_HANDLE_T _vc_resource;
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/// Rectangle of the captured resource that is transfered to user space
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VC_RECT_T _rectangle;
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/// Flags (transforms) for creating snapshots
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int _vc_flags;
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/// With of the captured snapshot [pixels]
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const unsigned _width;
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/// Height of the captured snapshot [pixels]
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const unsigned _height;
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// the selected VideoMode
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VideoMode _videoMode;
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// number of pixels to crop after capturing
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unsigned _cropLeft, _cropRight, _cropTop, _cropBottom;
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// temp buffer when capturing with unsupported pitch size or
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// when we need to crop the image
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ColorRgba* _captureBuffer;
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// size of the capture buffer in Pixels
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unsigned _captureBufferSize;
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Logger * _log;
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};
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