ardupilot/libraries/AP_OSD/AP_OSD_Backend.cpp

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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/>.
*
*/
#include <AP_OSD/AP_OSD_Backend.h>
#include <AP_HAL/Util.h>
#include <ctype.h>
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extern const AP_HAL::HAL& hal;
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#define SYM_DIG_OFS_1 0x90
#define SYM_DIG_OFS_2 0xA0
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void AP_OSD_Backend::write(uint8_t x, uint8_t y, bool blink, const char *fmt, ...)
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{
#if OSD_ENABLED
if (blink && (blink_phase < 2)) {
return;
}
char buff[32+1]; // +1 for snprintf null-termination
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va_list ap;
va_start(ap, fmt);
int res = hal.util->vsnprintf(buff, sizeof(buff), fmt, ap);
res = MIN(res, int(sizeof(buff)));
if (res > 0 && check_option(AP_OSD::OPTION_DECIMAL_PACK)) {
// automatically use packed decimal characters
// based on fiam idea implemented in inav osd
char *p = strchr(&buff[1],'.');
if (p && isdigit(p[1]) && isdigit(p[-1])) {
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p[-1] += SYM_DIG_OFS_1;
p[1] += SYM_DIG_OFS_2;
memmove(p, p+1, strlen(p+1)+1);
res--;
}
}
if (res < int(sizeof(buff))-1) {
write(x, y, buff);
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}
va_end(ap);
#endif
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}
/*
load a font from sdcard or ROMFS
*/
FileData *AP_OSD_Backend::load_font_data(uint8_t font_num)
{
FileData *fd;
// first try from microSD
char fontname[] = "font0.bin";
fontname[4] = font_num + '0';
fd = AP::FS().load_file(fontname);
if (fd == nullptr) {
char fontname_romfs[] = "@ROMFS/font0.bin";
fontname_romfs[7+4] = font_num + '0';
fd = AP::FS().load_file(fontname_romfs);
}
if (fd == nullptr) {
GCS_SEND_TEXT(MAV_SEVERITY_ERROR, "OSD: Failed to load font %u", font_num);
if (font_num != 0) {
// fallback to font0.bin. This allows us to reduce the
// number of fonts we include in flash without breaking
// user setups
return load_font_data(0);
}
}
return fd;
}