glyph_brush_draw_cache

用于 glyph_brush 中的 ab_glyph 的光栅化缓存。

• 管理一个纹理。将符号绘制到其中，并为符号提供纹理矩形查找。
• 需要时自动重用和重新排序。

use glyph_brush_draw_cache::DrawCache;

// build a cache with default settings
let mut draw_cache = DrawCache::builder().build();

// queue up some glyphs to store in the cache
for (font_id, glyph) in glyphs {
    draw_cache.queue_glyph(font_id, glyph);
}

// process everything in the queue, rasterizing & uploading as necessary
draw_cache.cache_queued(&fonts, |rect, tex_data| update_texture(rect, tex_data))?;

// access a given glyph's texture position & pixel position for the texture quad
match draw_cache.rect_for(font_id, &glyph) {
    Some((tex_coords, px_coords)) => {}
    None => {/* The glyph has no outline, or wasn't queued up to be cached */}
}

示例

查看 draw_cache_guts 示例以了解其工作方式 (从顶层运行)。

cargo run --example draw_cache_guts