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[BIndings/Odin] Improve example text measurement function

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Rats 2025-10-17 20:14:26 -05:00
parent 588b93196c
commit f5d431b01b
1 changed files with 30 additions and 11 deletions
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41
bindings/odin/examples/clay-official-website/clay_renderer_raylib.odin
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@ -1,5 +1,7 @@
package main
import "core:unicode/utf8"
import "base:runtime"
import clay "../../clay-odin"
import "core:math"
import "core:strings"
@ -17,23 +19,40 @@ clay_color_to_rl_color :: proc(color: clay.Color) -> rl.Color {
raylib_fonts := [dynamic]Raylib_Font{}
measure_text :: proc "c" (text: clay.StringSlice, config: ^clay.TextElementConfig, userData: rawptr) -> clay.Dimensions {
line_width: f32 = 0
// Needed for grapheme_count
context = runtime.default_context()
line_width: f32 = 0
font := raylib_fonts[config.fontId].font
text_str := string(text.chars[:text.length])
font := raylib_fonts[config.fontId].font
// This function seems somewhat expensive, if you notice performance issues, you could assume
// - 1 codepoint per visual character (no grapheme clusters), where you can get the length from the loop
// - 1 byte per visual character (ascii), where you can get the length with `text.length`
grapheme_count, _, _ := utf8.grapheme_count(text_str)
for i in 0 ..< text.length {
glyph_index := text.chars[i] - 32
for letter, byte_idx in text_str {
glyph_index := rl.GetGlyphIndex(font, letter)
glyph := font.glyphs[glyph_index]
if glyph.advanceX != 0 {
line_width += f32(glyph.advanceX)
} else {
line_width += font.recs[glyph_index].width + f32(glyph.offsetX)
}
}
if glyph.advanceX != 0 {
line_width += f32(glyph.advanceX)
} else {
line_width += font.recs[glyph_index].width + f32(font.glyphs[glyph_index].offsetX)
}
}
return {width = line_width / 2, height = f32(config.fontSize)}
scaleFactor := f32(config.fontSize) / f32(font.baseSize)
// Note:
// I'd expect this to be `grapheme_count - 1`,
// but that seems to be one letterSpacing too small
// maybe that's a raylib bug, maybe that's Clay?
total_spacing := f32(grapheme_count) * f32(config.letterSpacing)
return {width = line_width * scaleFactor + total_spacing, height = f32(config.fontSize)}
}
clay_raylib_render :: proc(render_commands: ^clay.ClayArray(clay.RenderCommand), allocator := context.temp_allocator) {