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Simple font size scaling for framebuf #131

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Simple font size scaling for framebuf #131

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53 changes: 53 additions & 0 deletions extmod/modframebuf.c
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Original file line number Diff line number Diff line change
Expand Up @@ -494,6 +494,58 @@ STATIC mp_obj_t framebuf_text(size_t n_args, const mp_obj_t *args) {
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_text_obj, 4, 5, framebuf_text);

STATIC mp_obj_t framebuf_text_scaled(size_t n_args, const mp_obj_t *args) {
// extract arguments
mp_obj_framebuf_t *self = MP_OBJ_TO_PTR(args[0]);
const char *str = mp_obj_str_get_str(args[1]);
mp_int_t x0 = mp_obj_get_int(args[2]);
mp_int_t y0 = mp_obj_get_int(args[3]);

mp_int_t scale = 1;
if (n_args >= 5) {
scale = mp_obj_get_int(args[4]);
}

mp_int_t col = 1;
if (n_args >= 6) {
col = mp_obj_get_int(args[5]);
}

// loop over chars
for (; *str; ++str) {
// get char and make sure its in range of font
int chr = *(uint8_t*)str;
if (chr < 32 || chr > 127) {
chr = 127;
}
// get char data
const uint8_t *chr_data = &font_petme128_8x8[(chr - 32) * 8];
// loop over char data
mp_int_t xs = 0;
mp_int_t ys = 0;
for (int j = 0; j < 8; j++, x0+=scale) {
uint vline_data = chr_data[j]; // each byte is a column of 8 pixels, LSB at top
for (int y = y0; vline_data; vline_data >>= 1, y+=scale) { // scan over vertical column
if (vline_data & 1) { // only draw if pixel set
for (int sx=0; sx < scale; sx++) {
xs=x0 + sx;
if (0 <= xs && xs < self->width) { // clip x
for(int sy=0; sy < scale; sy++) {
ys=y+sy;
if (0 <= ys && ys < self->height) { // clip y
setpixel(self, xs, ys, col);
}
}
}
}
}
}
}
}
return mp_const_none;
}
STATIC MP_DEFINE_CONST_FUN_OBJ_VAR_BETWEEN(framebuf_text_scaled_obj, 5, 6, framebuf_text_scaled);

STATIC const mp_rom_map_elem_t framebuf_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_fill), MP_ROM_PTR(&framebuf_fill_obj) },
{ MP_ROM_QSTR(MP_QSTR_fill_rect), MP_ROM_PTR(&framebuf_fill_rect_obj) },
Expand All @@ -505,6 +557,7 @@ STATIC const mp_rom_map_elem_t framebuf_locals_dict_table[] = {
{ MP_ROM_QSTR(MP_QSTR_blit), MP_ROM_PTR(&framebuf_blit_obj) },
{ MP_ROM_QSTR(MP_QSTR_scroll), MP_ROM_PTR(&framebuf_scroll_obj) },
{ MP_ROM_QSTR(MP_QSTR_text), MP_ROM_PTR(&framebuf_text_obj) },
{ MP_ROM_QSTR(MP_QSTR_text_scaled), MP_ROM_PTR(&framebuf_text_scaled_obj) },
};
STATIC MP_DEFINE_CONST_DICT(framebuf_locals_dict, framebuf_locals_dict_table);

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