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Only compile Type3 glyphs when Path2D is supported #15306

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merged 1 commit into from
Aug 13, 2022
Merged

Only compile Type3 glyphs when Path2D is supported #15306

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54 changes: 13 additions & 41 deletions src/display/canvas.js
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Original file line number Diff line number Diff line change
Expand Up @@ -54,8 +54,14 @@ const EXECUTION_TIME = 15; // ms
// Defines the number of steps before checking the execution time.
const EXECUTION_STEPS = 10;

const COMPILE_TYPE3_GLYPHS = true;
const MAX_SIZE_TO_COMPILE = 1000;
// To disable Type3 compilation, set the value to `-1`.
const MAX_SIZE_TO_COMPILE =
typeof PDFJSDev !== "undefined" &&
PDFJSDev.test("GENERIC") &&
isNodeJS &&
typeof Path2D === "undefined"
? -1
: 1000;

const FULL_CHUNK_HEIGHT = 16;

Expand Down Expand Up @@ -294,11 +300,7 @@ function drawImageAtIntegerCoords(

function compileType3Glyph(imgData) {
const { width, height } = imgData;
if (
!COMPILE_TYPE3_GLYPHS ||
width > MAX_SIZE_TO_COMPILE ||
height > MAX_SIZE_TO_COMPILE
) {
if (width > MAX_SIZE_TO_COMPILE || height > MAX_SIZE_TO_COMPILE) {
return null;
}

Expand Down Expand Up @@ -404,12 +406,7 @@ function compileType3Glyph(imgData) {

// building outlines
const steps = new Int32Array([0, width1, -1, 0, -width1, 0, 0, 0, 1]);
let path, outlines, coords;
if (!isNodeJS) {
path = new Path2D();
} else {
outlines = [];
}
const path = new Path2D();

for (i = 0; count && i <= height; i++) {
let p = i * width1;
Expand All @@ -420,12 +417,7 @@ function compileType3Glyph(imgData) {
if (p === end) {
continue;
}

if (path) {
path.moveTo(p % width1, i);
} else {
coords = [p % width1, i];
}
path.moveTo(p % width1, i);

const p0 = p;
let type = points[p];
Expand All @@ -448,21 +440,12 @@ function compileType3Glyph(imgData) {
// set new type for "future hit"
points[p] &= (type >> 2) | (type << 2);
}

if (path) {
path.lineTo(p % width1, (p / width1) | 0);
} else {
coords.push(p % width1, (p / width1) | 0);
}
path.lineTo(p % width1, (p / width1) | 0);

if (!points[p]) {
--count;
}
} while (p0 !== p);

if (!path) {
outlines.push(coords);
}
--i;
}

Expand All @@ -475,18 +458,7 @@ function compileType3Glyph(imgData) {
// the path shall be painted in [0..1]x[0..1] space
c.scale(1 / width, -1 / height);
c.translate(0, -height);
if (path) {
c.fill(path);
} else {
c.beginPath();
for (const o of outlines) {
c.moveTo(o[0], o[1]);
for (let l = 2, ll = o.length; l < ll; l += 2) {
c.lineTo(o[l], o[l + 1]);
}
}
c.fill();
}
c.fill(path);
c.beginPath();
c.restore();
};
Expand Down