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LibPDF: Make SampledFunction::evaluate() work for n-dimensional input

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I didn't find example code for this and the AI assistant did very
poorly on this as well. So I had to write it all by myself!

It can be much more efficient I think, but I think the overall
shape is maybe roughly fine.
This commit is contained in:
Nico Weber 2023-11-10 22:19:58 +01:00 • committed by Andreas Kling
parent 43dc9dfb69
commit f4a847894f
2 changed files with 92 additions and 23 deletions
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23
Tests/LibPDF/TestPDF.cpp
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@ -137,6 +137,29 @@ TEST_CASE(sampled)
EXPECT_EQ(MUST(f2->evaluate(Vector<float> { 0.5f })), (Vector<float> { 10.0f, 0.0f }));
EXPECT_EQ(MUST(f2->evaluate(Vector<float> { 0.75f })), (Vector<float> { 5.0f, 4.0f }));
EXPECT_EQ(MUST(f2->evaluate(Vector<float> { 1.0f })), (Vector<float> { 0.0f, 8.0f }));
auto f3 = MUST(make_sampled_function(Vector<u8> { { 0, 255, 0, 255, 0, 255 } }, { 0.0f, 1.0f, 0.0f, 1.0f }, { 0.0f, 10.0f }, { 3, 2 }));
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.0f, 0.0f })), Vector<float> { 0.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.25f, 0.0f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.5f, 0.0f })), Vector<float> { 10.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.75f, 0.0f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 1.0f, 0.0f })), Vector<float> { 0.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.0f, 0.5f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.25f, 0.5f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.5f, 0.5f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.75f, 0.5f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 1.0f, 0.5f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.0f, 1.0f })), Vector<float> { 10.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.25f, 1.0f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.5f, 1.0f })), Vector<float> { 0.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 0.75f, 1.0f })), Vector<float> { 5.0f });
EXPECT_EQ(MUST(f3->evaluate(Vector<float> { 1.0f, 1.0f })), Vector<float> { 10.0f });
auto f4 = MUST(make_sampled_function(Vector<u8> { { 0, 255, 255, 0, 0, 255, 255, 0 } }, { 0.0f, 1.0f, 0.0f, 1.0f }, { 0.0f, 10.0f, 0.0f, 8.0f }, { 2, 2 }));
EXPECT_EQ(MUST(f4->evaluate(Vector<float> { 0.0f, 0.0f })), (Vector<float> { 0.0f, 8.0f }));
EXPECT_EQ(MUST(f4->evaluate(Vector<float> { 0.5f, 0.5f })), (Vector<float> { 5.0f, 4.0f }));
}
static PDF::PDFErrorOr<NonnullRefPtr<PDF::Function>> make_postscript_function(StringView program, Vector<float> domain, Vector<float> range)