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1ba8a6f80f
This is useful to find the best matching color palette from an existing bitmap. It can be used in PixelPaint but also in encoders of old image formats that only support indexed colors e.g. GIF.
56 lines
1.8 KiB
C++
56 lines
1.8 KiB
C++
/*
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* Copyright (c) 2024, Lucas Chollet <lucas.chollet@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <LibGfx/Bitmap.h>
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#include <LibGfx/MedianCut.h>
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#include <LibTest/TestCase.h>
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TEST_CASE(single_element)
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{
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auto const bitmap = TRY_OR_FAIL(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, { 1, 1 }));
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bitmap->set_pixel(0, 0, Gfx::Color::NamedColor::White);
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auto const result = TRY_OR_FAIL(Gfx::median_cut(bitmap, 1));
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EXPECT_EQ(result.palette().size(), 1ul);
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EXPECT_EQ(result.closest_color(Gfx::Color::NamedColor::White), Gfx::Color::NamedColor::White);
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}
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namespace {
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constexpr auto colors = to_array<Gfx::Color>({ { 253, 0, 0 }, { 255, 0, 0 }, { 0, 253, 0 }, { 0, 255, 0 } });
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ErrorOr<NonnullRefPtr<Gfx::Bitmap>> create_test_bitmap()
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{
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auto bitmap = TRY(Gfx::Bitmap::create(Gfx::BitmapFormat::BGRA8888, { colors.size(), 1 }));
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for (u8 i = 0; i < colors.size(); ++i)
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bitmap->set_pixel(i, 0, colors[i]);
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return bitmap;
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}
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}
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TEST_CASE(four_in_four_out)
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{
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auto const bitmap = TRY_OR_FAIL(create_test_bitmap());
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auto const result = TRY_OR_FAIL(Gfx::median_cut(bitmap, 4));
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EXPECT_EQ(result.palette().size(), 4ul);
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for (auto const color : colors)
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EXPECT_EQ(result.closest_color(color), color);
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}
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TEST_CASE(four_in_two_out)
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{
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auto const bitmap = TRY_OR_FAIL(create_test_bitmap());
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auto const result = TRY_OR_FAIL(Gfx::median_cut(bitmap, 2));
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EXPECT_EQ(result.palette().size(), 2ul);
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EXPECT_EQ(result.closest_color(Gfx::Color(253, 0, 0)), Gfx::Color(254, 0, 0));
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EXPECT_EQ(result.closest_color(Gfx::Color(255, 0, 0)), Gfx::Color(254, 0, 0));
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EXPECT_EQ(result.closest_color(Gfx::Color(0, 253, 0)), Gfx::Color(0, 254, 0));
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EXPECT_EQ(result.closest_color(Gfx::Color(0, 255, 0)), Gfx::Color(0, 254, 0));
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}
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