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iterate on visible runs within textbounds (#108)

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tamewild 2024-07-28 18:34:16 +07:00 • committed by GitHub
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1 changed files with 12 additions and 1 deletions
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13
src/text_render.rs
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@ -60,7 +60,18 @@ impl TextRenderer {
let resolution = viewport.resolution(); let resolution = viewport.resolution();
for text_area in text_areas { for text_area in text_areas {
for run in text_area.buffer.layout_runs() { let is_run_visible = |run: &cosmic_text::LayoutRun| {
let start_y = (text_area.top + run.line_top) as i32;
let end_y = (text_area.top + run.line_top + run.line_height) as i32;
start_y <= text_area.bounds.bottom && text_area.bounds.top <= end_y
};
let layout_runs = text_area.buffer.layout_runs()
.skip_while(|run| !is_run_visible(run))
.take_while(is_run_visible);
for run in layout_runs {
for glyph in run.glyphs.iter() { for glyph in run.glyphs.iter() {
let physical_glyph = let physical_glyph =
glyph.physical((text_area.left, text_area.top), text_area.scale); glyph.physical((text_area.left, text_area.top), text_area.scale);