AP_OSD: added packed decimal support to MSP DisplayPort

This allows to take advantage of ArduPilot's compact decimal fonts
This commit is contained in:
yaapu 2021-09-19 23:38:01 +02:00 committed by Peter Barker
parent b8749b776a
commit 9acfdaaa19
4 changed files with 64 additions and 33 deletions

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@ -24,32 +24,69 @@ constexpr uint8_t AP_OSD_Backend::symbols[AP_OSD_NUM_SYMBOLS];
#define SYM_DIG_OFS_1 0x90 #define SYM_DIG_OFS_1 0x90
#define SYM_DIG_OFS_2 0xA0 #define SYM_DIG_OFS_2 0xA0
uint8_t AP_OSD_Backend::convert_to_decimal_packed_characters(char* buff, uint8_t size) {
if (size == 0) {
return 0;
}
#if OSD_ENABLED
// use packed decimal characters based on fiam idea implemented in inav osd
// search the decimal separator with a bound and always terminate the string
char* p = (char*)memchr(&buff[1],'.',size-1);
if (p && isdigit(p[1]) && isdigit(p[-1])) {
// remove the decimal separator and replace the digit before and after
p[-1] += SYM_DIG_OFS_1;
p[1] += SYM_DIG_OFS_2;
// shift anything after p[1] 1 character to the left
const char* move_start = p+1;
const uint8_t move_size = size-(move_start-buff);
memmove(p, move_start, move_size);
p[move_size] = 0x00; // terminate
return size-1;
}
#else
// we guarantee string is terminated
buff[size-1] = 0x00;
#endif
return size;
}
uint8_t AP_OSD_Backend::format_string_for_osd(char* buff, uint8_t size, bool decimal_packed, const char *fmt, va_list ap)
{
if (size == 0) {
return 0;
}
#if OSD_ENABLED
// note: vsnprintf() always terminates the string
int res = hal.util->vsnprintf(buff, size, fmt, ap);
res = MIN(res, size);
if (res > 0 && decimal_packed) {
// note: convert_to_decimal_packed_characters() always terminates the string
res = convert_to_decimal_packed_characters(buff, res);
}
return res;
#else
// we guarantee string is terminated
buff[0] = 0x00;
// and notify the caller we actually failed
return 0;
#endif
}
void AP_OSD_Backend::write(uint8_t x, uint8_t y, bool blink, const char *fmt, ...) void AP_OSD_Backend::write(uint8_t x, uint8_t y, bool blink, const char *fmt, ...)
{ {
#if OSD_ENABLED #if OSD_ENABLED
if (blink && (blink_phase < 2)) { if (blink && (blink_phase < 2)) {
return; return;
} }
char buff[32+1]; // +1 for snprintf null-termination
va_list ap; va_list ap;
va_start(ap, fmt); va_start(ap, fmt);
int res = hal.util->vsnprintf(buff, sizeof(buff), fmt, ap); char buff[32+1]; // +1 for null-termination
res = MIN(res, int(sizeof(buff))); // note: format_string_for_osd() always terminates the string
if (res > 0 && check_option(AP_OSD::OPTION_DECIMAL_PACK)) { IGNORE_RETURN(format_string_for_osd(buff, sizeof(buff), check_option(AP_OSD::OPTION_DECIMAL_PACK), fmt, ap));
// 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])) {
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);
}
va_end(ap); va_end(ap);
// buff is null terminated, this call should be safe without further checks
write(x, y, buff);
#endif #endif
} }

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@ -76,6 +76,9 @@ protected:
return (_osd.options & option) != 0; return (_osd.options & option) != 0;
} }
uint8_t convert_to_decimal_packed_characters(char* buff, uint8_t size);
virtual uint8_t format_string_for_osd(char* dst, uint8_t size, bool decimal_packed, const char *fmt, va_list ap);
// load a font from sdcard or ROMFS // load a font from sdcard or ROMFS
FileData *load_font_data(uint8_t font_num); FileData *load_font_data(uint8_t font_num);

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@ -67,20 +67,11 @@ void AP_OSD_MSP_DisplayPort::write(uint8_t x, uint8_t y, const char* text)
_displayport->msp_displayport_write_string(x, y, 0, text); _displayport->msp_displayport_write_string(x, y, 0, text);
} }
void AP_OSD_MSP_DisplayPort::write(uint8_t x, uint8_t y, bool blink, const char *fmt, ...) uint8_t AP_OSD_MSP_DisplayPort::format_string_for_osd(char* buff, uint8_t size, bool decimal_packed, const char *fmt, va_list ap)
{ {
if (blink && !_blink_on) { const AP_MSP *msp = AP::msp();
return; const bool pack = decimal_packed && msp && !msp->is_option_enabled(AP_MSP::Option::DISPLAYPORT_BTFL_SYMBOLS);
} return AP_OSD_Backend::format_string_for_osd(buff, size, pack, fmt, ap);
char buf[32+1]; // +1 for snprintf null-termination
va_list ap;
va_start(ap, fmt);
int res = hal.util->vsnprintf(buf, sizeof(buf), fmt, ap);
res = MIN(res, int(sizeof(buf)));
if (res < int(sizeof(buf))-1) {
_displayport->msp_displayport_write_string(x, y, blink, buf);
}
va_end(ap);
} }
void AP_OSD_MSP_DisplayPort::flush(void) void AP_OSD_MSP_DisplayPort::flush(void)

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@ -15,9 +15,6 @@ public:
//draw given text to framebuffer //draw given text to framebuffer
void write(uint8_t x, uint8_t y, const char* text) override; void write(uint8_t x, uint8_t y, const char* text) override;
//draw formatted text to framebuffer
void write(uint8_t x, uint8_t y, bool blink, const char *fmt, ...) override FMT_PRINTF(5, 6);
//flush framebuffer to screen //flush framebuffer to screen
void flush() override; void flush() override;
@ -28,6 +25,9 @@ public:
void init_symbol_set(uint8_t *lookup_table, const uint8_t size) override; void init_symbol_set(uint8_t *lookup_table, const uint8_t size) override;
protected:
uint8_t format_string_for_osd(char* dst, uint8_t size, bool decimal_packed, const char *fmt, va_list ap) override;
private: private:
void setup_defaults(void); void setup_defaults(void);