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display/font: optimise font rendering by about 25% (#4956)
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commit
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2 changed files with 13 additions and 17 deletions
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@ -8,25 +8,23 @@ namespace display {
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static const char *const TAG = "display";
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bool Glyph::get_pixel(int x, int y) const {
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const int x_data = x - this->glyph_data_->offset_x;
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const int y_data = y - this->glyph_data_->offset_y;
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if (x_data < 0 || x_data >= this->glyph_data_->width || y_data < 0 || y_data >= this->glyph_data_->height)
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return false;
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const uint32_t width_8 = ((this->glyph_data_->width + 7u) / 8u) * 8u;
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const uint32_t pos = x_data + y_data * width_8;
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return progmem_read_byte(this->glyph_data_->data + (pos / 8u)) & (0x80 >> (pos % 8u));
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}
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void Glyph::draw(int x_at, int y_start, DisplayBuffer *display, Color color) const {
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int scan_x1, scan_y1, scan_width, scan_height;
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this->scan_area(&scan_x1, &scan_y1, &scan_width, &scan_height);
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const int glyph_x_max = scan_x1 + scan_width;
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const int glyph_y_max = scan_y1 + scan_height;
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for (int glyph_x = scan_x1; glyph_x < glyph_x_max; glyph_x++) {
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for (int glyph_y = scan_y1; glyph_y < glyph_y_max; glyph_y++) {
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if (this->get_pixel(glyph_x, glyph_y)) {
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display->draw_pixel_at(glyph_x + x_at, glyph_y + y_start, color);
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const unsigned char *data = this->glyph_data_->data;
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const int max_x = x_at + scan_x1 + scan_width;
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const int max_y = y_start + scan_y1 + scan_height;
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for (int glyph_y = y_start + scan_y1; glyph_y < max_y; glyph_y++) {
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for (int glyph_x = x_at + scan_x1; glyph_x < max_x; data++, glyph_x += 8) {
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uint8_t pixel_data = progmem_read_byte(data);
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const int pixel_max_x = std::min(max_x, glyph_x + 8);
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for (int pixel_x = glyph_x; pixel_x < pixel_max_x && pixel_data; pixel_x++, pixel_data <<= 1) {
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if (pixel_data & 0x80) {
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display->draw_pixel_at(pixel_x, glyph_y, color);
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}
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}
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}
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}
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@ -22,8 +22,6 @@ class Glyph {
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public:
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Glyph(const GlyphData *data) : glyph_data_(data) {}
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bool get_pixel(int x, int y) const;
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void draw(int x, int y, DisplayBuffer *display, Color color) const;
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const char *get_char() const;
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