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Merge pull request #19317 from Snuffleupagus/FontRendererFactory-reus…
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…e-helpers

Re-use existing helper functions in `FontRendererFactory`
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@timvandermeij
timvandermeij authored Jan 12, 2025
2 parents db40155 + e0be2a0 commit e1b972a
Showing 1 changed file with 36 additions and 49 deletions.
85 changes: 36 additions & 49 deletions src/core/font_renderer.js
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Original file line number Diff line number Diff line change
Expand Up @@ -22,36 +22,23 @@ import {
Util,
warn,
} from "../shared/util.js";
import {
isNumberArray,
readInt8,
readUint16,
readUint32,
} from "./core_utils.js";
import { CFFParser } from "./cff_parser.js";
import { getGlyphsUnicode } from "./glyphlist.js";
import { isNumberArray } from "./core_utils.js";
import { StandardEncoding } from "./encodings.js";
import { Stream } from "./stream.js";

// TODO: use DataView and its methods.

function getUint32(data, offset) {
return (
((data[offset] << 24) |
(data[offset + 1] << 16) |
(data[offset + 2] << 8) |
data[offset + 3]) >>>
0
);
}

function getUint16(data, offset) {
return (data[offset] << 8) | data[offset + 1];
}

function getInt16(data, offset) {
return ((data[offset] << 24) | (data[offset + 1] << 16)) >> 16;
}

function getInt8(data, offset) {
return (data[offset] << 24) >> 24;
}

function getFloat214(data, offset) {
return getInt16(data, offset) / 16384;
}
Expand All @@ -69,48 +56,48 @@ function getSubroutineBias(subrs) {

function parseCmap(data, start, end) {
const offset =
getUint16(data, start + 2) === 1
? getUint32(data, start + 8)
: getUint32(data, start + 16);
const format = getUint16(data, start + offset);
readUint16(data, start + 2) === 1
? readUint32(data, start + 8)
: readUint32(data, start + 16);
const format = readUint16(data, start + offset);
let ranges, p, i;
if (format === 4) {
getUint16(data, start + offset + 2); // length
const segCount = getUint16(data, start + offset + 6) >> 1;
readUint16(data, start + offset + 2); // length
const segCount = readUint16(data, start + offset + 6) >> 1;
p = start + offset + 14;
ranges = [];
for (i = 0; i < segCount; i++, p += 2) {
ranges[i] = { end: getUint16(data, p) };
ranges[i] = { end: readUint16(data, p) };
}
p += 2;
for (i = 0; i < segCount; i++, p += 2) {
ranges[i].start = getUint16(data, p);
ranges[i].start = readUint16(data, p);
}
for (i = 0; i < segCount; i++, p += 2) {
ranges[i].idDelta = getUint16(data, p);
ranges[i].idDelta = readUint16(data, p);
}
for (i = 0; i < segCount; i++, p += 2) {
let idOffset = getUint16(data, p);
let idOffset = readUint16(data, p);
if (idOffset === 0) {
continue;
}
ranges[i].ids = [];
for (let j = 0, jj = ranges[i].end - ranges[i].start + 1; j < jj; j++) {
ranges[i].ids[j] = getUint16(data, p + idOffset);
ranges[i].ids[j] = readUint16(data, p + idOffset);
idOffset += 2;
}
}
return ranges;
} else if (format === 12) {
const groups = getUint32(data, start + offset + 12);
const groups = readUint32(data, start + offset + 12);
p = start + offset + 16;
ranges = [];
for (i = 0; i < groups; i++) {
start = getUint32(data, p);
start = readUint32(data, p);
ranges.push({
start,
end: getUint32(data, p + 4),
idDelta: getUint32(data, p + 8) - start,
end: readUint32(data, p + 4),
idDelta: readUint32(data, p + 8) - start,
});
p += 12;
}
Expand Down Expand Up @@ -141,10 +128,10 @@ function parseGlyfTable(glyf, loca, isGlyphLocationsLong) {
let itemSize, itemDecode;
if (isGlyphLocationsLong) {
itemSize = 4;
itemDecode = getUint32;
itemDecode = readUint32;
} else {
itemSize = 2;
itemDecode = (data, offset) => 2 * getUint16(data, offset);
itemDecode = (data, offset) => 2 * readUint16(data, offset);
}
const glyphs = [];
let startOffset = itemDecode(loca, 0);
Expand Down Expand Up @@ -201,22 +188,22 @@ function compileGlyf(code, cmds, font) {
if (numberOfContours < 0) {
// composite glyph
do {
flags = getUint16(code, i);
const glyphIndex = getUint16(code, i + 2);
flags = readUint16(code, i);
const glyphIndex = readUint16(code, i + 2);
i += 4;
let arg1, arg2;
if (flags & 0x01) {
if (flags & 0x02) {
arg1 = getInt16(code, i);
arg2 = getInt16(code, i + 2);
} else {
arg1 = getUint16(code, i);
arg2 = getUint16(code, i + 2);
arg1 = readUint16(code, i);
arg2 = readUint16(code, i + 2);
}
i += 4;
} else if (flags & 0x02) {
arg1 = getInt8(code, i++);
arg2 = getInt8(code, i++);
arg1 = readInt8(code, i++);
arg2 = readInt8(code, i++);
} else {
arg1 = code[i++];
arg2 = code[i++];
Expand Down Expand Up @@ -266,10 +253,10 @@ function compileGlyf(code, cmds, font) {
const endPtsOfContours = [];
let j, jj;
for (j = 0; j < numberOfContours; j++) {
endPtsOfContours.push(getUint16(code, i));
endPtsOfContours.push(readUint16(code, i));
i += 2;
}
const instructionLength = getUint16(code, i);
const instructionLength = readUint16(code, i);
i += 2 + instructionLength; // skipping the instructions
const numberOfPoints = endPtsOfContours.at(-1) + 1;
const points = [];
Expand Down Expand Up @@ -899,11 +886,11 @@ class FontRendererFactory {
static create(font, seacAnalysisEnabled) {
const data = new Uint8Array(font.data);
let cmap, glyf, loca, cff, indexToLocFormat, unitsPerEm;
const numTables = getUint16(data, 4);
const numTables = readUint16(data, 4);
for (let i = 0, p = 12; i < numTables; i++, p += 16) {
const tag = bytesToString(data.subarray(p, p + 4));
const offset = getUint32(data, p + 8);
const length = getUint32(data, p + 12);
const offset = readUint32(data, p + 8);
const length = readUint32(data, p + 12);
switch (tag) {
case "cmap":
cmap = parseCmap(data, offset, offset + length);
Expand All @@ -915,8 +902,8 @@ class FontRendererFactory {
loca = data.subarray(offset, offset + length);
break;
case "head":
unitsPerEm = getUint16(data, offset + 18);
indexToLocFormat = getUint16(data, offset + 50);
unitsPerEm = readUint16(data, offset + 18);
indexToLocFormat = readUint16(data, offset + 50);
break;
case "CFF ":
cff = parseCff(data, offset, offset + length, seacAnalysisEnabled);
Expand Down

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