mirror of
https://github.com/RGBCube/serenity
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44a5558525
Previously only a QOI image decoder was available on the system. This commit adds an encoder as well. For now it only handles images with 4 channels (RGBA).
49 lines
1.1 KiB
C++
49 lines
1.1 KiB
C++
/*
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* Copyright (c) 2022, Olivier De Cannière <olivier.decanniere96@gmail.com>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#pragma once
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#include <AK/Vector.h>
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#include <LibGfx/Bitmap.h>
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namespace Gfx {
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static constexpr Array<u8, 4> qoi_magic_bytes = { 'q', 'o', 'i', 'f' };
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static constexpr Array<u8, 8> qoi_end_marker = { 0, 0, 0, 0, 0, 0, 0, 1 };
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enum class Colorspace {
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sRGB,
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Linear,
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};
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enum class Channels {
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RGB,
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RGBA,
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};
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class QOIWriter {
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public:
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static ByteBuffer encode(Gfx::Bitmap const&);
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private:
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QOIWriter() = default;
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Vector<u8> m_data;
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void add_header(u32 width, u32 height, Channels, Colorspace);
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void add_rgb_chunk(u8, u8, u8);
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void add_rgba_chunk(u8, u8, u8, u8);
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void add_index_chunk(u32 index);
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void add_diff_chunk(i8 red_difference, i8 green_difference, i8 blue_difference);
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void add_luma_chunk(i8 relative_red_difference, i8 green_difference, i8 relative_blue_difference);
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void add_run_chunk(u32 run_length);
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void add_end_marker();
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Array<Color, 64> running_array;
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static u32 pixel_hash_function(Color pixel);
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void insert_into_running_array(Color pixel);
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};
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}
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