ardupilot/libraries/AP_OSD/AP_OSD_Backend.h

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/*
* This file is free software: you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This file is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
* See the GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
#pragma once
#include <AP_HAL/HAL.h>
#include <AP_OSD/AP_OSD.h>
#include <AP_Filesystem/AP_Filesystem.h>
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class AP_OSD_Backend
{
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public:
//constructor
AP_OSD_Backend(AP_OSD &osd): _osd(osd) {};
//destructor
virtual ~AP_OSD_Backend(void) {}
//draw given text to framebuffer
virtual void write(uint8_t x, uint8_t y, const char* text) = 0;
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//draw formatted text to framebuffer
virtual void write(uint8_t x, uint8_t y, bool blink, const char *fmt, ...) FMT_PRINTF(5, 6);
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//initilize framebuffer and underlying hardware
virtual bool init() = 0;
//update screen
virtual void flush() = 0;
// return a correction factor used to display angles correctly
virtual float get_aspect_ratio_correction() const {return 1;}
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//clear screen
//should match hw blink
virtual void clear()
{
blink_phase = (blink_phase+1)%4;
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};
AP_OSD * get_osd()
{
return &_osd;
}
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protected:
AP_OSD& _osd;
// get font choice
uint8_t get_font_num(void) const
{
return (uint8_t)_osd.font_num.get();
}
//check option
bool check_option(uint32_t option) const
{
return (_osd.options & option) != 0;
}
// load a font from sdcard or ROMFS
FileData *load_font_data(uint8_t font_num);
int8_t blink_phase;
enum vid_format {
FORMAT_UNKNOWN = 0,
FORMAT_NTSC = 1,
FORMAT_PAL = 2,
} _format;
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};