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LibPDF: Add a spec comment to SampledFunction::sample()

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Nico Weber 2023-11-25 16:40:25 -05:00 • committed by Andreas Kling
parent aad5c58996
commit d9fd72007e
1 changed files with 10 additions and 0 deletions
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10
Userland/Libraries/LibPDF/Function.cpp
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@ -30,6 +30,16 @@ private:
float sample(Vector<int> const& coordinates, size_t r) const
{
// "For a function with multidimensional input (more than one input variable),
// the sample values in the first dimension vary fastest,
// and the values in the last dimension vary slowest.
// For example, for a function f(a, b, c), where a, b, and c vary from 0 to 9 in steps of 1,
// the sample values would appear in this order:
// f(0,0,0), f(1,0,0), ..., f(9,0,0),
// f(0,1,0), f(1,1,0), ..., f(9,1,0),
// f(0,2,0), f(1, 2, 0), ..., f(9, 9, 0),
// f(0, 0, 1), f(1, 0, 1), and so on."
// Implied is that functions with multiple outputs store all outputs next to each other.
size_t stride = 1;
size_t offset = 0;
for (size_t i = 0; i < coordinates.size(); ++i) {