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test-jpeg-roundtrip: Print perceived delta of fixpoint to start color

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Nico Weber 2024-01-13 21:44:32 -05:00 • committed by Sam Atkins
parent 5a47e71604
commit 8ef3310525
1 changed files with 17 additions and 1 deletions
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18
Userland/Utilities/test-jpeg-roundtrip.cpp
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@ -4,6 +4,9 @@
* SPDX-License-Identifier: BSD-2-Clause * SPDX-License-Identifier: BSD-2-Clause
*/ */
#include <LibGfx/DeltaE.h>
#include <LibGfx/ICC/Profile.h>
#include <LibGfx/ICC/WellKnownProfiles.h>
#include <LibGfx/ImageFormats/JPEGLoader.h> #include <LibGfx/ImageFormats/JPEGLoader.h>
#include <LibGfx/ImageFormats/JPEGWriter.h> #include <LibGfx/ImageFormats/JPEGWriter.h>
#include <LibMain/Main.h> #include <LibMain/Main.h>
@ -38,10 +41,23 @@ static ErrorOr<Fixpoint> compute_fixpoint(Gfx::Color start_color)
return Fixpoint { last_color, number_of_iterations }; return Fixpoint { last_color, number_of_iterations };
} }
static ErrorOr<float> perceived_distance_in_sRGB(Gfx::Color a, Gfx::Color b)
{
auto sRGB = TRY(Gfx::ICC::sRGB());
Array<u8, 3> array_a { a.red(), a.green(), a.blue() };
Array<u8, 3> array_b { b.red(), b.green(), b.blue() };
return DeltaE(TRY(sRGB->to_lab(array_a)), TRY(sRGB->to_lab(array_b)));
}
static ErrorOr<void> test(Gfx::Color color) static ErrorOr<void> test(Gfx::Color color)
{ {
auto fixpoint = TRY(compute_fixpoint(color)); auto fixpoint = TRY(compute_fixpoint(color));
outln("color {} converges to {} after saving {} times", color, fixpoint.fixpoint, fixpoint.number_of_iterations);
float perceived_distance = TRY(perceived_distance_in_sRGB(color, fixpoint.fixpoint));
outln("color {} converges to {} after saving {} times, delta {}", color, fixpoint.fixpoint, fixpoint.number_of_iterations, perceived_distance);
return {}; return {};
} }