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, 0, 2, 4, 0, 1, 0, 5, 4, 8, 10, 0, 8, 0, 2, 1, 0,
]); ]);
const width1 = width + 1, const width1 = width + 1;
points = new Uint8Array(width1 * (height + 1)); let points = new Uint8Array(width1 * (height + 1));
let i, j, j0; let i, j, j0;
// decodes bit-packed mask data // decodes bit-packed mask data
const lineSize = (width + 7) & ~7, const lineSize = (width + 7) & ~7;
data = new Uint8Array(lineSize * height); let data = new Uint8Array(lineSize * height),
let pos = 0; pos = 0;
for (const elem of imgData.data) { for (const elem of imgData.data) {
let mask = 128; let mask = 128;
while (mask > 0) { while (mask > 0) {
@ -624,6 +624,10 @@ function compileType3Glyph(imgData) {
--i; --i;
} }
// Immediately release the, potentially large, `Uint8Array`s after parsing.
data = null;
points = null;
const drawOutline = function (c) { const drawOutline = function (c) {
c.save(); c.save();
// the path shall be painted in [0..1]x[0..1] space // the path shall be painted in [0..1]x[0..1] space