Sakurai/pdf.js
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Immediately release the temporary Uint8Arrays used during Type3-compilation

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Given that the `compileType3Glyph` function *returns* a function, see `drawOutline`, we'll thus keep the surrounding scope alive. Hence it shouldn't hurt to *explicitly* mark the temporary `Uint8Array`s, used during parsing, as no longer needed. Given the current `MAX_SIZE_TO_COMPILE`-value these `Uint8Array`s may be approximately two mega-bytes large *for every* Type3-glyph.
This commit is contained in:
Jonas Jenwald 2022-05-02 13:15:03 +02:00
parent db12492584
commit 67719af9df
1 changed files with 9 additions and 5 deletions
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14
src/display/canvas.js
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@ -465,14 +465,14 @@ function compileType3Glyph(imgData) {
0, 2, 4, 0, 1, 0, 5, 4, 8, 10, 0, 8, 0, 2, 1, 0,
]);
const width1 = width + 1,
points = new Uint8Array(width1 * (height + 1));
const width1 = width + 1;
let points = new Uint8Array(width1 * (height + 1));
let i, j, j0;
// decodes bit-packed mask data
const lineSize = (width + 7) & ~7,
data = new Uint8Array(lineSize * height);
let pos = 0;
const lineSize = (width + 7) & ~7;
let data = new Uint8Array(lineSize * height),
pos = 0;
for (const elem of imgData.data) {
let mask = 128;
while (mask > 0) {
@ -624,6 +624,10 @@ function compileType3Glyph(imgData) {
--i;
}
// Immediately release the, potentially large, `Uint8Array`s after parsing.
data = null;
points = null;
const drawOutline = function (c) {
c.save();
// the path shall be painted in [0..1]x[0..1] space