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mirror of https://github.com/esphome/esphome.git synced 2025-03-16 15:48:16 +00:00
Clyde Stubbs 23ffc3ddfb
[lvgl] base implementation (#7116)
Co-authored-by: Jesse Hills <3060199+jesserockz@users.noreply.github.com>
2024-07-25 11:12:04 +12:00

77 lines
2.6 KiB
C++

#include "lvgl_esphome.h"
#ifdef USE_LVGL_FONT
namespace esphome {
namespace lvgl {
static const uint8_t *get_glyph_bitmap(const lv_font_t *font, uint32_t unicode_letter) {
auto *fe = (FontEngine *) font->dsc;
const auto *gd = fe->get_glyph_data(unicode_letter);
if (gd == nullptr)
return nullptr;
// esph_log_d(TAG, "Returning bitmap @ %X", (uint32_t)gd->data);
return gd->data;
}
static bool get_glyph_dsc_cb(const lv_font_t *font, lv_font_glyph_dsc_t *dsc, uint32_t unicode_letter, uint32_t next) {
auto *fe = (FontEngine *) font->dsc;
const auto *gd = fe->get_glyph_data(unicode_letter);
if (gd == nullptr)
return false;
dsc->adv_w = gd->offset_x + gd->width;
dsc->ofs_x = gd->offset_x;
dsc->ofs_y = fe->height - gd->height - gd->offset_y - fe->baseline;
dsc->box_w = gd->width;
dsc->box_h = gd->height;
dsc->is_placeholder = 0;
dsc->bpp = fe->bpp;
return true;
}
FontEngine::FontEngine(font::Font *esp_font) : font_(esp_font) {
this->bpp = esp_font->get_bpp();
this->lv_font_.dsc = this;
this->lv_font_.line_height = this->height = esp_font->get_height();
this->lv_font_.base_line = this->baseline = this->lv_font_.line_height - esp_font->get_baseline();
this->lv_font_.get_glyph_dsc = get_glyph_dsc_cb;
this->lv_font_.get_glyph_bitmap = get_glyph_bitmap;
this->lv_font_.subpx = LV_FONT_SUBPX_NONE;
this->lv_font_.underline_position = -1;
this->lv_font_.underline_thickness = 1;
}
const lv_font_t *FontEngine::get_lv_font() { return &this->lv_font_; }
const font::GlyphData *FontEngine::get_glyph_data(uint32_t unicode_letter) {
if (unicode_letter == last_letter_)
return this->last_data_;
uint8_t unicode[5];
memset(unicode, 0, sizeof unicode);
if (unicode_letter > 0xFFFF) {
unicode[0] = 0xF0 + ((unicode_letter >> 18) & 0x7);
unicode[1] = 0x80 + ((unicode_letter >> 12) & 0x3F);
unicode[2] = 0x80 + ((unicode_letter >> 6) & 0x3F);
unicode[3] = 0x80 + (unicode_letter & 0x3F);
} else if (unicode_letter > 0x7FF) {
unicode[0] = 0xE0 + ((unicode_letter >> 12) & 0xF);
unicode[1] = 0x80 + ((unicode_letter >> 6) & 0x3F);
unicode[2] = 0x80 + (unicode_letter & 0x3F);
} else if (unicode_letter > 0x7F) {
unicode[0] = 0xC0 + ((unicode_letter >> 6) & 0x1F);
unicode[1] = 0x80 + (unicode_letter & 0x3F);
} else {
unicode[0] = unicode_letter;
}
int match_length;
int glyph_n = this->font_->match_next_glyph(unicode, &match_length);
if (glyph_n < 0)
return nullptr;
this->last_data_ = this->font_->get_glyphs()[glyph_n].get_glyph_data();
this->last_letter_ = unicode_letter;
return this->last_data_;
}
} // namespace lvgl
} // namespace esphome
#endif // USES_LVGL_FONT