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https://github.com/Ed94/VEFontCache-Odin.git
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improvements while working Sectr Prototype
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152
atlas.odin
152
atlas.odin
@@ -86,68 +86,110 @@ atlas_bbox :: proc( atlas : ^Atlas, region : AtlasRegionKind, local_idx : i32 )
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return
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}
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decide_codepoint_region :: proc( ctx : ^Context, entry : ^Entry, glyph_index : Glyph
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// decide_codepoint_region :: proc( ctx : ^Context, entry : ^Entry, glyph_index : Glyph
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// ) -> (region_kind : AtlasRegionKind, region : ^AtlasRegion, 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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// region_kind = .None
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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 := cast(u32) (bounds_width * entry.size_scale + glyph_padding)
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// bounds_height_scaled := cast(u32) (bounds_height * entry.size_scale + glyph_padding)
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// if bounds_width_scaled <= atlas.region_a.width && bounds_height_scaled <= atlas.region_a.height
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// {
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// // Region A for small glyphs. These are good for things such as punctuation.
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// region_kind = .A
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// region = & atlas.region_a
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// }
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// else if bounds_width_scaled <= atlas.region_b.width && bounds_height_scaled <= atlas.region_b.height
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// {
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// // Region B for tall glyphs. These are good for things such as european alphabets.
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// region_kind = .B
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// region = & atlas.region_b
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// }
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// else if bounds_width_scaled <= atlas.region_c.width && bounds_height_scaled <= atlas.region_c.height
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// {
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// // Region C for big glyphs. These are good for things such as asian typography.
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// region_kind = .C
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// region = & atlas.region_c
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// }
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// else if bounds_width_scaled <= atlas.region_d.width && bounds_height_scaled <= atlas.region_d.height
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// {
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// // Region D for huge glyphs. These are good for things such as titles and 4k.
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// region_kind = .D
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// region = & atlas.region_d
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// }
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// else if bounds_width_scaled <= glyph_buffer.width && bounds_height_scaled <= glyph_buffer.height
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// {
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// // Region 'E' for massive glyphs. These are rendered uncached and un-oversampled.
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// region_kind = .E
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// region = nil
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// if bounds_width_scaled <= glyph_buffer.width / 2 && bounds_height_scaled <= glyph_buffer.height / 2 {
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// over_sample = { 2.0, 2.0 }
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// }
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// else {
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// over_sample = { 1.0, 1.0 }
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// }
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// return
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// }
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// else {
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// region_kind = .None
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// return
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// }
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// over_sample = glyph_buffer.over_sample
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// assert(region != nil)
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// return
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// }
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decide_codepoint_region :: proc(ctx : ^Context, entry : ^Entry, glyph_index : Glyph
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) -> (region_kind : AtlasRegionKind, region : ^AtlasRegion, 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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region_kind = .None
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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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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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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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glyph_padding := f32(atlas.glyph_padding) * 2
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bounds_width_scaled := u32(bounds_width * entry.size_scale + glyph_padding)
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bounds_height_scaled := u32(bounds_height * entry.size_scale + glyph_padding)
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bounds_width_scaled := cast(u32) (bounds_width * entry.size_scale + glyph_padding)
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bounds_height_scaled := cast(u32) (bounds_height * entry.size_scale + glyph_padding)
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if bounds_width_scaled <= atlas.region_a.width && bounds_height_scaled <= atlas.region_a.height
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{
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// Region A for small glyphs. These are good for things such as punctuation.
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region_kind = .A
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region = & atlas.region_a
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}
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else if bounds_width_scaled <= atlas.region_b.width && bounds_height_scaled <= atlas.region_b.height
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{
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// Region B for tall glyphs. These are good for things such as european alphabets.
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region_kind = .B
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region = & atlas.region_b
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}
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else if bounds_width_scaled <= atlas.region_c.width && bounds_height_scaled <= atlas.region_c.height
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{
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// Region C for big glyphs. These are good for things such as asian typography.
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region_kind = .C
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region = & atlas.region_c
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}
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else if bounds_width_scaled <= atlas.region_d.width && bounds_height_scaled <= atlas.region_d.height
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{
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// Region D for huge glyphs. These are good for things such as titles and 4k.
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region_kind = .D
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region = & atlas.region_d
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}
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else if bounds_width_scaled <= glyph_buffer.width && bounds_height_scaled <= glyph_buffer.height
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{
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// Region 'E' for massive glyphs. These are rendered uncached and un-oversampled.
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region_kind = .E
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region = nil
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if bounds_width_scaled <= glyph_buffer.width / 2 && bounds_height_scaled <= glyph_buffer.height / 2 {
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over_sample = { 2.0, 2.0 }
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}
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else {
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over_sample = { 1.0, 1.0 }
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}
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return
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}
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else {
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region_kind = .None
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return
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// Use a lookup table for faster region selection
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region_lookup := [4]struct { kind: AtlasRegionKind, region: ^AtlasRegion } {
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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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over_sample = glyph_buffer.over_sample
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assert(region != nil)
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return
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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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