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My Project
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#include <mmal_parameters_video.h>
Public Attributes | |
| MMAL_PARAMETER_HEADER_T | hdr |
| uint32_t | set |
| uint32_t | display_num |
| MMAL_BOOL_T | fullscreen |
| MMAL_DISPLAYTRANSFORM_T | transform |
| MMAL_RECT_T | dest_rect |
| MMAL_RECT_T | src_rect |
| MMAL_BOOL_T | noaspect |
| MMAL_DISPLAYMODE_T | mode |
| uint32_t | pixel_x |
| uint32_t | pixel_y |
| int32_t | layer |
| MMAL_BOOL_T | copyprotect_required |
| uint32_t | alpha |
This config sets the output display device, as well as the region used on the output display, any display transformation, and some flags to indicate how to scale the image.
| uint32_t MMAL_DISPLAYREGION_T::alpha |
Level of opacity of the layer, where zero is fully transparent and 255 is fully opaque.
| MMAL_BOOL_T MMAL_DISPLAYREGION_T::copyprotect_required |
Set to non-zero to ensure copy protection is used on output.
Where to display the frame within the screen, if fullscreen is zero.
| uint32_t MMAL_DISPLAYREGION_T::display_num |
Describes the display output device, with 0 typically being a directly connected LCD display. The actual values will depend on the hardware. Code using hard-wired numbers (e.g. 2) is certain to fail.
| MMAL_BOOL_T MMAL_DISPLAYREGION_T::fullscreen |
Indicates that we are using the full device screen area, rather than a window of the display. If zero, then dest_rect is used to specify a region of the display to use.
| int32_t MMAL_DISPLAYREGION_T::layer |
Sets the relative depth of the images, with greater values being in front of smaller values.
| MMAL_DISPLAYMODE_T MMAL_DISPLAYREGION_T::mode |
Indicates how the image should be scaled to fit the display.
MMAL_DISPLAY_MODE_FILL
indicates that the image should fill the screen by potentially cropping the frames. Setting
to
MMAL_DISPLAY_MODE_LETTERBOX
indicates that all the source region should be displayed and black bars added if necessary.
| MMAL_BOOL_T MMAL_DISPLAYREGION_T::noaspect |
If set to non-zero, indicates that any display scaling should disregard the aspect ratio of the frame region being displayed.
| uint32_t MMAL_DISPLAYREGION_T::pixel_x |
If non-zero, defines the width of a source pixel relative to
. If zero, then pixels default to being square.
| uint32_t MMAL_DISPLAYREGION_T::pixel_y |
If non-zero, defines the height of a source pixel relative to
. If zero, then pixels default to being square.
| uint32_t MMAL_DISPLAYREGION_T::set |
Bitfield that indicates which fields are set and should be used. All other fields will maintain their current value. MMAL_DISPLAYSET_T defines the bits that can be combined.
Indicates which area of the frame to display. If all values are zero, the whole frame will be used.
| MMAL_DISPLAYTRANSFORM_T MMAL_DISPLAYREGION_T::transform |
Indicates any rotation or flipping used to map frames onto the natural display orientation.
1.7.6.1
