102 lines
3.1 KiB
Rust
102 lines
3.1 KiB
Rust
use st7735::gfx::PrimitveGFX;
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pub struct FontGlyph {
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pub bitmap_offset: usize, // Offset in glyph bitmap
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pub width: u8, // Size of glyph
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pub height: u8,
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pub x_advance: u8, // Distance to advance along x-axis
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pub x_offset: i8, // Distance to upper left coner from cursor pos
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pub y_offset: i8,
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}
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pub struct Font {
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pub bitmap: &'static [u8], // Glyph bitmaps, concatenated
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pub glyphs: &'static [FontGlyph], // Array of glyph metadata
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pub first: u8, // Start of ASCII extend
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pub last: u8, // End of ASCII extend
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pub y_advance: u8, // Line height
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}
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pub trait FontRenderer: PrimitveGFX {
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fn draw_glyph(&mut self, x: u8, y: u8, glyph: &FontGlyph, font: &Font, size: u8, color: u16) {
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if size == 0 {
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return;
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}
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// Any clipping should be done by draw_rect
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let x = x as i16;
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let y = y as i16;
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let size = size as i16;
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let mut bo = glyph.bitmap_offset;
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let mut set_pixels: i16 = 0;
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let mut bits: u8 = 0;
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let mut bit: u8 = 0;
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for cur_y in 0..(glyph.height as i16) {
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for cur_x in 0..(glyph.width as i16) {
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if bit == 0 {
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bits = font.bitmap[bo];
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bo += 1;
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bit = 0x80;
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}
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if bit & bits != 0 {
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set_pixels += 1;
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} else if set_pixels > 0 {
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let start_x = (x + ((glyph.x_offset as i16) + cur_x - set_pixels) * size) as u8;
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let start_y = (y + ((glyph.y_offset as i16) + cur_y) * size) as u8;
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let w = (set_pixels * size) as u8;
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let h = size as u8;
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self.fill_rect(start_x, start_y, w, h, color);
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set_pixels = 0;
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}
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bit >>= 1;
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}
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if set_pixels > 0 {
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let start_x = (x +
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((glyph.x_offset as i16) + (glyph.width as i16) -
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set_pixels) * size) as u8;
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let start_y = (y + ((glyph.y_offset as i16) + cur_y) * size) as u8;
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let w = (set_pixels * size) as u8;
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let h = size as u8;
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self.fill_rect(start_x, start_y, w, h, color);
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set_pixels = 0;
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}
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}
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}
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fn draw_text(&mut self, x: u8, y: u8, text: &str, font: &Font, size: u8, color: u16) {
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let mut cursor_x = x;
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let mut cursor_y = y;
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for text_char in text.chars() {
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let c = if text_char.is_ascii() {
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text_char as u8
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}
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else {
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'?' as u8
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};
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if c == '\n' as u8 {
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cursor_x = x;
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cursor_y += font.y_advance * size;
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}
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else if c >= font.first && c <= font.last && c != '\r' as u8 {
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let pos = (c - font.first) as usize;
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let glyph = &font.glyphs[pos];
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self.draw_glyph(cursor_x, cursor_y, glyph, &font, size, color);
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cursor_x += glyph.x_advance * size;
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}
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}
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}
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}
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