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