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LibGfx/ICC: Add a one-element cache for CLUT conversions

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Our current CLUT code is pretty slow. A one-element cache can make
it quite a bit faster for images that have long runs of a single
color, such as illustrations.

It also seems to help with photos some (in `0000711.pdf` page 1) --
I suppose even them have enough repeating pixels for it to be worth
it.

Some numbers, with `pdf --render-bench`:

`0000711.pdf --page 1` (high-res photo)
before: 2.9s
after: 2.43s

`0000277.pdf --page 19` (my nemesis PDF, large-ish illustration)
before: 2.17s
after: 0.58s (!)

`0000502.pdf --page 2` (wat hoe dat)
before: 0.66s
after: 0.27s

`0000521.pdf --page 10 ` (japanese)
before: 0.52s
after: 0.29s

`0000364.pdf --page 1` (4 min test case)
before: 0.48s
after: 0.19s

Thanks to that last one, reduces the time for
`time Meta/test_pdf.py ~/Downloads/0000` from 4m22s to 1m28s.

Helps quite a bit with #23157 (but high-res photos are still too
slow).
This commit is contained in:
Nico Weber 2024-02-18 22:24:37 -05:00 • committed by Sam Atkins
parent 6a8e418e40
commit 27e369cd19
2 changed files with 26 additions and 4 deletions
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24
Userland/Libraries/LibGfx/ICC/Profile.cpp
View file

@ -1219,14 +1219,21 @@ ErrorOr<FloatVector3> Profile::to_pcs_a_to_b(TagData const& tag_data, ReadonlyBy
// Assumes a "normal" device_class() (i.e. not DeviceLink).
VERIFY(number_of_components_in_color_space(connection_space()) == 3);
if (m_to_pcs_clut_cache.has_value() && m_to_pcs_clut_cache->key == color)
return m_to_pcs_clut_cache->value;
FloatVector3 result;
switch (tag_data.type()) {
case Lut16TagData::Type: {
auto const& a_to_b = static_cast<Lut16TagData const&>(tag_data);
return a_to_b.evaluate(data_color_space(), connection_space(), color);
result = TRY(a_to_b.evaluate(data_color_space(), connection_space(), color));
break;
}
case Lut8TagData::Type: {
auto const& a_to_b = static_cast<Lut8TagData const&>(tag_data);
return a_to_b.evaluate(data_color_space(), connection_space(), color);
result = TRY(a_to_b.evaluate(data_color_space(), connection_space(), color));
break;
}
case LutAToBTagData::Type: {
auto const& a_to_b = static_cast<LutAToBTagData const&>(tag_data);
@ -1236,10 +1243,19 @@ ErrorOr<FloatVector3> Profile::to_pcs_a_to_b(TagData const& tag_data, ReadonlyBy
if (a_to_b.number_of_output_channels() != number_of_components_in_color_space(connection_space()))
return Error::from_string_literal("ICC::Profile::to_pcs_a_to_b: mAB output channel count does not match profile connection space size");
return a_to_b.evaluate(connection_space(), color);
result = TRY(a_to_b.evaluate(connection_space(), color));
break;
}
default:
VERIFY_NOT_REACHED();
}
VERIFY_NOT_REACHED();
if (!m_to_pcs_clut_cache.has_value())
m_to_pcs_clut_cache = OneElementCLUTCache {};
m_to_pcs_clut_cache->key = Vector<u8, 4>(color);
m_to_pcs_clut_cache->value = result;
return result;
}
ErrorOr<FloatVector3> Profile::to_pcs(ReadonlyBytes color) const

6
Userland/Libraries/LibGfx/ICC/Profile.h
View file

@ -321,6 +321,12 @@ private:
FloatMatrix3x3 rgb_to_xyz_matrix() const;
mutable Optional<FloatMatrix3x3> m_cached_xyz_to_rgb_matrix;
struct OneElementCLUTCache {
Vector<u8, 4> key;
FloatVector3 value;
};
mutable Optional<OneElementCLUTCache> m_to_pcs_clut_cache;
};
}