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improve text perf by combining words in line

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This commit is contained in:
Gokhan Kurt 2021-10-01 16:09:17 +03:00
parent eeda86bd5e
commit 457edf0d1f
1 changed files with 29 additions and 3 deletions
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32
src/css/layout/text.ts
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@ -22,7 +22,7 @@ export const parseTextBounds = (
styles: CSSParsedDeclaration, styles: CSSParsedDeclaration,
node: Text node: Text
): TextBounds[] => { ): TextBounds[] => {
const textList = breakText(value, styles); const textList = breakText(value, styles, node);
const textBounds: TextBounds[] = []; const textBounds: TextBounds[] = [];
let offset = 0; let offset = 0;
textList.forEach((text) => { textList.forEach((text) => {
@ -86,8 +86,34 @@ const getRangeBounds = (context: Context, node: Text, offset: number, length: nu
return Bounds.fromClientRect(context, createRange(node, offset, length).getBoundingClientRect()); return Bounds.fromClientRect(context, createRange(node, offset, length).getBoundingClientRect());
}; };
const breakText = (value: string, styles: CSSParsedDeclaration): string[] => { const breakText = (value: string, styles: CSSParsedDeclaration, node: Text): string[] => {
return styles.letterSpacing !== 0 ? splitGraphemes(value) : breakWords(value, styles); return styles.letterSpacing !== 0 ? splitGraphemes(value) : breakLines(value, styles, node);
};
const breakLines = (value: string, styles: CSSParsedDeclaration, node: Text): string[] => {
const words = breakWords(value, styles);
const lines: string[] = [];
let offset = 0;
let acc = '';
for (const word of words) {
const rects = createRange(node, offset, acc.length + word.length).getClientRects();
if (rects.length <= 1) {
acc += word;
} else {
offset += acc.length;
lines.push(acc);
acc = word;
}
}
if (acc.length > 0) {
lines.push(acc);
}
return lines;
}; };
// https://drafts.csswg.org/css-text/#word-separator // https://drafts.csswg.org/css-text/#word-separator