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XFA - Add the possibily to layout and measure text

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- some containers doesn't always have their 2 dimensions and those dimensions re based on contents;
  - so in order to measure text, we must get the glyph widths (for the xfa fonts) before starting the layout;
  - implement a word-wrap algorithm;
  - handle font change during text layout.
This commit is contained in:
Calixte Denizet 2021-06-14 19:16:42 +02:00
parent 335d4cb2fc
commit 8eeb7ab4a3
12 changed files with 416 additions and 91 deletions
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6
src/core/fonts.js
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@ -872,6 +872,7 @@ class Font {
this.capHeight = properties.capHeight / PDF_GLYPH_SPACE_UNITS;
this.ascent = properties.ascent / PDF_GLYPH_SPACE_UNITS;
this.descent = properties.descent / PDF_GLYPH_SPACE_UNITS;
this.lineHeight = this.ascent - this.descent;
this.fontMatrix = properties.fontMatrix;
this.bbox = properties.bbox;
this.defaultEncoding = properties.defaultEncoding;
@ -2495,13 +2496,16 @@ class Font {
unitsPerEm: int16(tables.head.data[18], tables.head.data[19]),
yMax: int16(tables.head.data[42], tables.head.data[43]),
yMin: signedInt16(tables.head.data[38], tables.head.data[39]),
ascent: int16(tables.hhea.data[4], tables.hhea.data[5]),
ascent: signedInt16(tables.hhea.data[4], tables.hhea.data[5]),
descent: signedInt16(tables.hhea.data[6], tables.hhea.data[7]),
lineGap: signedInt16(tables.hhea.data[8], tables.hhea.data[9]),
};
// PDF FontDescriptor metrics lie -- using data from actual font.
this.ascent = metricsOverride.ascent / metricsOverride.unitsPerEm;
this.descent = metricsOverride.descent / metricsOverride.unitsPerEm;
this.lineGap = metricsOverride.lineGap / metricsOverride.unitsPerEm;
this.lineHeight = this.ascent - this.descent + this.lineGap;
// The 'post' table has glyphs names.
if (tables.post) {