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[api-minor] Remove the forceClamped-functionality in the Streams (issue 14849)

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As it turns out, most of the code-paths in the `PDFImage`-class won't actually pass the TypedArray (containing the image-data) to the `ColorSpace`-code. Hence we *generally* don't need to force the image-data to be a `Uint8ClampedArray`, and can just as well directly use a `Uint8Array` instead.

In the following cases we're returning the data without any `ColorSpace`-parsing, and the exact TypedArray used shouldn't matter:
 - b72a448327/src/core/image.js (L714)
 - b72a448327/src/core/image.js (L751)

In the following cases the image-data is only used *internally*, and again the exact TypedArray used shouldn't matter:
 - b72a448327/src/core/image.js (L762) with the actual image-data being defined (as `Uint8ClampedArray`) further below
 - b72a448327/src/core/image.js (L837)

*Please note:* This is tagged `api-minor` because it's API-observable, given that *some* image/mask-data will now be returned as `Uint8Array` rather than using `Uint8ClampedArray` unconditionally. However, that seems like a small price to pay to (slightly) reduce memory usage during image-conversion.
This commit is contained in:
Jonas Jenwald 2022-04-28 14:04:20 +02:00
parent b72a448327
commit fbf6dee8ee
8 changed files with 44 additions and 94 deletions
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5
src/core/evaluator.js
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@ -613,10 +613,7 @@ class PartialEvaluator {
// for later.
const interpolate = dict.get("I", "Interpolate");
const bitStrideLength = (w + 7) >> 3;
const imgArray = image.getBytes(
bitStrideLength * h,
/* forceClamped = */ true
);
const imgArray = image.getBytes(bitStrideLength * h);
const decode = dict.getArray("D", "Decode");
if (this.parsingType3Font) {