pimoroni-pico/libraries/hershey_fonts/hershey_fonts.cpp

112 lines
2.6 KiB
C++

#include "hershey_fonts.hpp"
#include "common/unicode_sorta.hpp"
#include <cmath>
namespace hershey {
std::map<std::string, const font_t*> fonts = {
{ "sans", &futural },
//{ "sans_bold", &futuram },
{ "gothic", &gothgbt },
//{ "cursive_bold", &scriptc },
{ "cursive", &scripts },
{ "serif_italic", &timesi },
{ "serif", &timesr },
//{ "serif_bold", &timesrb }
};
inline float deg2rad(float degrees) {
return (degrees * M_PI) / 180.0f;
}
const font_glyph_t* glyph_data(const font_t* font, unsigned char c) {
if(c < 32 || c > 127 + 64) { // + 64 char remappings defined in unicode_sorta.hpp
return nullptr;
}
if(c > 127) {
c = unicode_sorta::char_base_195[c - 128];
}
return &font->chars[c - 32];
}
int32_t measure_glyph(const font_t* font, unsigned char c, float s) {
const font_glyph_t *gd = glyph_data(font, c);
// if glyph data not found (id too great) then skip
if(!gd) {
return 0;
}
return gd->width * s;
}
int32_t measure_text(const font_t* font, std::string message, float s) {
int32_t width = 0;
for(auto &c : message) {
width += measure_glyph(font, c, s);
}
return width;
}
int32_t glyph(const font_t* font, line_func line, unsigned char c, int32_t x, int32_t y, float s, float a) {
const font_glyph_t *gd = glyph_data(font, c);
// if glyph data not found (id too great) then skip
if(!gd) {
return 0;
}
a = deg2rad(a);
float as = sin(a);
float ac = cos(a);
const int8_t *pv = gd->vertices;
int8_t cx = (*pv++) * s;
int8_t cy = (*pv++) * s;
bool pen_down = true;
for(uint32_t i = 1; i < gd->vertex_count; i++) {
if(pv[0] == -128 && pv[1] == -128) {
pen_down = false;
pv += 2;
}else{
int8_t nx = (*pv++) * s;
int8_t ny = (*pv++) * s;
int rcx = (cx * ac - cy * as) + 0.5f;
int rcy = (cx * as + cy * ac) + 0.5f;
int rnx = (nx * ac - ny * as) + 0.5f;
int rny = (nx * as + ny * ac) + 0.5f;
if(pen_down) {
line(rcx + x, rcy + y, rnx + x, rny + y);
}
cx = nx;
cy = ny;
pen_down = true;
}
}
return gd->width * s;
}
void text(const font_t* font, line_func line, std::string message, int32_t x, int32_t y, float s, float a) {
int32_t cx = x;
int32_t cy = y;
int32_t ox = 0;
float as = sin(deg2rad(a));
float ac = cos(deg2rad(a));
for(auto &c : message) {
int rcx = (ox * ac) + 0.5f;
int rcy = (ox * as) + 0.5f;
ox += glyph(font, line, c, cx + rcx, cy + rcy, s, a);
}
}
}