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Merge pull request #21596 from Snuffleupagus/pattern-bCache-Map

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Re-factor the `bCache`, used with /Mesh Shadings
This commit is contained in:
Tim van der Meij 2026-07-19 13:50:44 +02:00 committed by GitHub
commit 0a3ed983be
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GPG Key ID: B5690EEEBB952194
2 changed files with 16 additions and 16 deletions
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28
src/core/pattern.js
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@ -667,25 +667,25 @@ class MeshStreamReader {
}
}
let bCache = Object.create(null);
let bCache = null;
function buildB(count) {
const lut = [];
for (let i = 0; i <= count; i++) {
const t = i / count,
t_ = 1 - t;
lut.push(
new Float32Array([t_ ** 3, 3 * t * t_ ** 2, 3 * t ** 2 * t_, t ** 3])
);
}
return lut;
}
function getB(count) {
return (bCache[count] ||= buildB(count));
return (bCache ??= new Map()).getOrInsertComputed(count, () =>
Array.from({ length: count + 1 }, (_, i) => {
const t = i / count,
t_ = 1 - t;
return new Float32Array([
t_ ** 3,
3 * t * t_ ** 2,
3 * t ** 2 * t_,
t ** 3,
]);
})
);
}
function clearPatternCaches() {
bCache = Object.create(null);
bCache?.clear();
}
class MeshShading extends BaseShading {

4
src/display/pattern_helper.js
View File

@ -36,6 +36,8 @@ function applyBoundingBox(ctx, bbox) {
}
class BaseShadingPattern {
matrix = null;
constructor() {
if (
(typeof PDFJSDev === "undefined" || PDFJSDev.test("TESTING")) &&
@ -64,7 +66,6 @@ class RadialAxialShadingPattern extends BaseShadingPattern {
this._p1 = IR[5];
this._r0 = IR[6];
this._r1 = IR[7];
this.matrix = null;
}
isOriginBased() {
@ -381,7 +382,6 @@ class MeshShadingPattern extends BaseShadingPattern {
this._bounds = IR[5];
this._bbox = IR[6];
this._background = IR[7];
this.matrix = null;
// Pre-compile the mesh pipeline now that we know GPU-renderable content
// is present; no-op if the GPU is not available or already compiled.
loadMeshShader();