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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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10
src/core/stream.js
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@ -45,24 +45,20 @@ class Stream extends BaseStream {
return this.bytes[this.pos++];
}
getBytes(length, forceClamped = false) {
getBytes(length) {
const bytes = this.bytes;
const pos = this.pos;
const strEnd = this.end;
if (!length) {
const subarray = bytes.subarray(pos, strEnd);
// `this.bytes` is always a `Uint8Array` here.
return forceClamped ? new Uint8ClampedArray(subarray) : subarray;
return bytes.subarray(pos, strEnd);
}
let end = pos + length;
if (end > strEnd) {
end = strEnd;
}
this.pos = end;
const subarray = bytes.subarray(pos, end);
// `this.bytes` is always a `Uint8Array` here.
return forceClamped ? new Uint8ClampedArray(subarray) : subarray;
return bytes.subarray(pos, end);
}
getByteRange(begin, end) {