mirror of
https://github.com/Ed94/VEFontCache-Odin.git
synced 2025-08-06 06:52:44 -07:00
127 lines
3.6 KiB
Odin
127 lines
3.6 KiB
Odin
package vefontcache
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Atlas_Region_Kind :: enum u8 {
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None = 0x00,
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A = 0x41,
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B = 0x42,
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C = 0x43,
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D = 0x44,
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E = 0x45,
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Ignore = 0xFF, // ve_fontcache_cache_glyph_to_atlas uses a -1 value in clear draw call
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}
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Atlas_Region :: struct {
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state : LRU_Cache,
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width : i32,
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height : i32,
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size : Vec2i,
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capacity : Vec2i,
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offset : Vec2i,
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next_idx : i32,
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}
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Atlas :: struct {
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width : i32,
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height : i32,
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glyph_padding : i32,
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region_a : Atlas_Region,
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region_b : Atlas_Region,
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region_c : Atlas_Region,
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region_d : Atlas_Region,
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}
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atlas_bbox :: proc( atlas : ^Atlas, region : Atlas_Region_Kind, local_idx : i32 ) -> (position, size: Vec2)
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{
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switch region
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{
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case .A:
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size.x = f32(atlas.region_a.width)
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size.y = f32(atlas.region_a.height)
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position.x = cast(f32) (( local_idx % atlas.region_a.capacity.x ) * atlas.region_a.width)
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position.y = cast(f32) (( local_idx / atlas.region_a.capacity.x ) * atlas.region_a.height)
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position.x += f32(atlas.region_a.offset.x)
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position.y += f32(atlas.region_a.offset.y)
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case .B:
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size.x = f32(atlas.region_b.width)
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size.y = f32(atlas.region_b.height)
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position.x = cast(f32) (( local_idx % atlas.region_b.capacity.x ) * atlas.region_b.width)
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position.y = cast(f32) (( local_idx / atlas.region_b.capacity.x ) * atlas.region_b.height)
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position.x += f32(atlas.region_b.offset.x)
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position.y += f32(atlas.region_b.offset.y)
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case .C:
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size.x = f32(atlas.region_c.width)
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size.y = f32(atlas.region_c.height)
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position.x = cast(f32) (( local_idx % atlas.region_c.capacity.x ) * atlas.region_c.width)
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position.y = cast(f32) (( local_idx / atlas.region_c.capacity.x ) * atlas.region_c.height)
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position.x += f32(atlas.region_c.offset.x)
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position.y += f32(atlas.region_c.offset.y)
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case .D:
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size.x = f32(atlas.region_d.width)
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size.y = f32(atlas.region_d.height)
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position.x = cast(f32) (( local_idx % atlas.region_d.capacity.x ) * atlas.region_d.width)
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position.y = cast(f32) (( local_idx / atlas.region_d.capacity.x ) * atlas.region_d.height)
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position.x += f32(atlas.region_d.offset.x)
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position.y += f32(atlas.region_d.offset.y)
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case .Ignore, .None, .E:
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}
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return
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}
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decide_codepoint_region :: proc(ctx : ^Context, entry : ^Entry, glyph_index : Glyph ) -> (region_kind : Atlas_Region_Kind, region : ^Atlas_Region, over_sample : Vec2)
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{
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if parser_is_glyph_empty(&entry.parser_info, glyph_index) {
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return .None, nil, {}
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}
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bounds_0, bounds_1 := parser_get_glyph_box(&entry.parser_info, glyph_index)
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bounds_width := f32(bounds_1.x - bounds_0.x)
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bounds_height := f32(bounds_1.y - bounds_0.y)
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atlas := & ctx.atlas
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glyph_buffer := & ctx.glyph_buffer
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glyph_padding := f32( atlas.glyph_padding ) * 2
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bounds_width_scaled := i32(bounds_width * entry.size_scale + glyph_padding)
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bounds_height_scaled := i32(bounds_height * entry.size_scale + glyph_padding)
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// Use a lookup table for faster region selection
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region_lookup := [4]struct { kind: Atlas_Region_Kind, region: ^Atlas_Region } {
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{ .A, & atlas.region_a },
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{ .B, & atlas.region_b },
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{ .C, & atlas.region_c },
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{ .D, & atlas.region_d },
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}
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for region in region_lookup do if bounds_width_scaled <= region.region.width && bounds_height_scaled <= region.region.height {
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return region.kind, region.region, glyph_buffer.over_sample
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}
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if bounds_width_scaled <= glyph_buffer.width \
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&& bounds_height_scaled <= glyph_buffer.height {
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over_sample = \
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bounds_width_scaled <= glyph_buffer.width / 2 &&
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bounds_height_scaled <= glyph_buffer.height / 2 ? \
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{2.0, 2.0} \
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: {1.0, 1.0}
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return .E, nil, over_sample
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}
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return .None, nil, {}
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}
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