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note perf todo

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This commit is contained in:
Mitchell Hashimoto
2022-04-05 20:17:08 -07:00
parent 5e919cee2d
commit a9e887315a
1 changed files with 4 additions and 1 deletions
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src/FontAtlas.zig
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@ -145,6 +145,9 @@ pub fn addGlyph(self: *FontAtlas, alloc: Allocator, v: anytype) !void {
const region = try self.atlas.reserve(alloc, tgt_w, tgt_h);
// Build our buffer
//
// TODO(perf): we can avoid a buffer copy here in some cases where
// tgt_w == bitmap.width and bitmap.width == bitmap.pitch
const buffer = try alloc.alloc(u8, tgt_w * tgt_h);
defer alloc.free(buffer);
var dst_ptr = buffer;
@ -178,7 +181,7 @@ pub fn addGlyph(self: *FontAtlas, alloc: Allocator, v: anytype) !void {
/// Convert 26.6 pixel format to f32
fn f26dot6ToFloat(v: ftc.FT_F26Dot6) f32 {
return @intToFloat(f32, v) / 64.0;
return @intToFloat(f32, v >> 6);
}
/// Returns the UTF-32 codepoint for the given value.