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Remove hash map lookup for every pixel rendered

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This commit is contained in:
Gwilym Kuiper 2022-04-23 14:30:46 +01:00
parent 6d0f95c21b
commit fec4015978
1 changed files with 53 additions and 25 deletions
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76
agb/src/display/font.rs
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@ -86,7 +86,7 @@ pub struct TextRenderer<'a> {
bg: &'a mut RegularMap,
background_colour: u8,
foreground_colour: u8,
tiles: HashMap<(usize, usize), DynamicTile<'a>>,
tiles: HashMap<(i32, i32), DynamicTile<'a>>,
}
impl<'a> Write for TextRenderer<'a> {
@ -96,23 +96,6 @@ impl<'a> Write for TextRenderer<'a> {
let foreground_colour = self.foreground_colour;
let background_colour = self.background_colour;
let mut render_pixel = |x: u16, y: u16| {
let tile_x = (x / 8) as usize;
let tile_y = (y / 8) as usize;
let inner_x = x % 8;
let inner_y = y % 8;
let colour = foreground_colour as u32;
let index = (inner_x + inner_y * 8) as usize;
let tile = tiles
.entry((tile_x, tile_y))
.or_insert_with(|| vram_manager.new_dynamic_tile().fill_with(background_colour));
tile.tile_data[index / 8] |= colour << ((index % 8) * 4);
};
for c in text.chars() {
if c == '\n' {
self.current_y_pos += self.font.line_height;
@ -126,15 +109,56 @@ impl<'a> Write for TextRenderer<'a> {
let y_start =
self.current_y_pos + self.font.ascent - letter.height as i32 - letter.ymin as i32;
for letter_y in 0..(letter.height as i32) {
for letter_x in 0..(letter.width as i32) {
let x = x_start + letter_x;
let y = y_start + letter_y;
let x_tile_start = x_start / 8;
let y_tile_start = y_start / 8;
let px = letter.data[(letter_x + letter_y * letter.width as i32) as usize];
let letter_offset_x = x_start.rem_euclid(8);
let letter_offset_y = y_start.rem_euclid(8);
let x_tiles = div_ceil(letter.width as i32 + letter_offset_x, 8);
let y_tiles = div_ceil(letter.height as i32 + letter_offset_y, 8);
for letter_y_tile in 0..(y_tiles + 1) {
let letter_y_start = 0.max(letter_offset_y - 8 * letter_y_tile) + 8 * letter_y_tile;
let letter_y_end =
(letter_offset_y + letter.height as i32).min((letter_y_tile + 1) * 8);
let tile_y = y_tile_start + letter_y_tile;
for letter_x_tile in 0..(x_tiles + 1) {
let letter_x_start =
0.max(letter_offset_x - 8 * letter_x_tile) + 8 * letter_x_tile;
let letter_x_end =
(letter_offset_x + letter.width as i32).min((letter_x_tile + 1) * 8);
let tile_x = x_tile_start + letter_x_tile;
let mut masks = [0u32; 8];
let mut zero = true;
for letter_y in letter_y_start..letter_y_end {
let y = letter_y - letter_offset_y;
for letter_x in letter_x_start..letter_x_end {
let x = letter_x - letter_offset_x;
let px = letter.data[(x + y * letter.width as i32) as usize];
if px > 100 {
render_pixel(x as u16, y as u16);
masks[(letter_y & 7) as usize] |=
(foreground_colour as u32) << ((letter_x & 7) * 4);
zero = false;
}
}
}
if !zero {
let tile = tiles.entry((tile_x, tile_y)).or_insert_with(|| {
vram_manager.new_dynamic_tile().fill_with(background_colour)
});
for (i, tile_data_line) in tile.tile_data.iter_mut().enumerate() {
*tile_data_line |= masks[i];
}
}
}
}
@ -146,6 +170,10 @@ impl<'a> Write for TextRenderer<'a> {
}
}
fn div_ceil(quotient: i32, divisor: i32) -> i32 {
(quotient + divisor - 1) / divisor
}
impl<'a> TextRenderer<'a> {
pub fn commit(mut self) {
let tiles = core::mem::take(&mut self.tiles);