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[api-minor] Annotations - Adjust the font size in text field in considering the total width (bug 1721335)

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- it aims to fix #14502 and bug 1721335;
 - Acrobat and Pdfium do the same;
 - it'll avoid to have truncated data when printed;
 - change the factor to compute font size in using field height: lineHeight = 1.35*fontSize
  - this is the value used by Acrobat.
 - in order to not have truncated strings on the bottom, add few basic metrics for standard fonts.
This commit is contained in:
Calixte Denizet 2022-01-27 22:51:30 +01:00
parent 8f6965b197
commit ae842e1c3a
8 changed files with 214 additions and 40 deletions
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16
src/core/fonts.js
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@ -59,6 +59,7 @@ import {
import { IdentityToUnicodeMap, ToUnicodeMap } from "./to_unicode_map.js";
import { CFFFont } from "./cff_font.js";
import { FontRendererFactory } from "./font_renderer.js";
import { getFontBasicMetrics } from "./metrics.js";
import { GlyfTable } from "./glyf.js";
import { IdentityCMap } from "./cmap.js";
import { OpenTypeFileBuilder } from "./opentype_file_builder.js";
@ -1074,6 +1075,21 @@ class Font {
);
fontName = stdFontMap[fontName] || nonStdFontMap[fontName] || fontName;
const fontBasicMetricsMap = getFontBasicMetrics();
const metrics = fontBasicMetricsMap[fontName];
if (metrics) {
if (isNaN(this.ascent)) {
this.ascent = metrics.ascent / PDF_GLYPH_SPACE_UNITS;
}
if (isNaN(this.descent)) {
this.descent = metrics.descent / PDF_GLYPH_SPACE_UNITS;
}
if (isNaN(this.capHeight)) {
this.capHeight = metrics.capHeight / PDF_GLYPH_SPACE_UNITS;
}
}
this.bold = fontName.search(/bold/gi) !== -1;
this.italic =
fontName.search(/oblique/gi) !== -1 || fontName.search(/italic/gi) !== -1;