mirror of
https://github.com/RGBCube/serenity
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f898a00eb3
Previously, the variables were named similarly to the names in spec which aren't very human-readable. This adds some utility functions for dimensional unit conversions and names the variables in residual() based on their units. References to 4x4 blocks were also renamed to call them sub-blocks instead, since unit conversion functions would not be able to begin with "4x4_blocks".
94 lines
1.8 KiB
C++
94 lines
1.8 KiB
C++
/*
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* Copyright (c) 2021, Hunter Salyer <thefalsehonesty@gmail.com>
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* Copyright (c) 2022, Gregory Bertilson <zaggy1024@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/Types.h>
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#include <LibGfx/Size.h>
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#include "LookupTables.h"
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namespace Video::VP9 {
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// FIXME: Once everything is working, replace this with plain clamp
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// since parameter order is different
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template<typename T>
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T clip_3(T x, T y, T z)
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{
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return clamp(z, x, y);
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}
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template<typename T>
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u16 clip_1(u8 bit_depth, T x)
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{
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if (x < 0) {
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return 0u;
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}
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const T max = (1u << bit_depth) - 1u;
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if (x > max)
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return max;
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return x;
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}
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template<typename T, typename C>
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inline T brev(C bit_count, T value)
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{
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T result = 0;
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for (C i = 0; i < bit_count; i++) {
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auto bit = (value >> i) & 1;
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result |= bit << (bit_count - 1 - i);
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}
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return result;
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}
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inline Gfx::Size<u8> block_size_to_sub_blocks(BlockSubsize size)
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{
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return Gfx::Size<u8>(num_4x4_blocks_wide_lookup[size], num_4x4_blocks_high_lookup[size]);
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}
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template<Integral T>
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inline T blocks_to_sub_blocks(T blocks)
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{
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return blocks << 1;
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}
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template<Integral T>
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inline T sub_blocks_to_blocks(T sub_blocks)
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{
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return sub_blocks >> 1;
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}
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template<Integral T>
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inline T sub_blocks_to_pixels(T sub_blocks)
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{
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return sub_blocks << 2;
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}
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template<Integral T>
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inline T pixels_to_sub_blocks(T pixels)
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{
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return pixels >> 2;
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}
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template<Integral T>
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inline T blocks_to_pixels(T blocks)
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{
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return sub_blocks_to_pixels(blocks_to_sub_blocks(blocks));
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}
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template<Integral T>
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inline T pixels_to_blocks(T pixels)
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{
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return sub_blocks_to_blocks(pixels_to_sub_blocks(pixels));
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}
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inline u8 transform_size_to_sub_blocks(TXSize transform_size)
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{
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return 1 << transform_size;
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}
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}
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