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MDEC: Improve decoding

This commit is contained in:
Connor McLaughlin 2019-10-05 22:21:31 +10:00
parent ec85ae7a40
commit 751f348fd2
1 changed files with 9 additions and 5 deletions
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14
src/core/mdec.cpp
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@ -304,8 +304,8 @@ const u16* MDEC::DecodeColoredMacroblock(const u16* src, const u16* src_end)
}
yuv_to_rgb(0, 0, Crblk, Cbblk, Yblk[0], out_rgb);
yuv_to_rgb(0, 8, Crblk, Cbblk, Yblk[1], out_rgb);
yuv_to_rgb(8, 0, Crblk, Cbblk, Yblk[2], out_rgb);
yuv_to_rgb(8, 0, Crblk, Cbblk, Yblk[1], out_rgb);
yuv_to_rgb(0, 8, Crblk, Cbblk, Yblk[2], out_rgb);
yuv_to_rgb(8, 8, Crblk, Cbblk, Yblk[3], out_rgb);
switch (m_status.data_output_depth)
@ -382,11 +382,14 @@ static constexpr std::array<u8, 64> zigzag = {{0, 1, 5, 6, 14, 15, 27, 28, 2
3, 8, 12, 17, 25, 30, 41, 43, 9, 11, 18, 24, 31, 40, 44, 53,
10, 19, 23, 32, 39, 45, 52, 54, 20, 22, 33, 38, 46, 51, 55, 60,
21, 34, 37, 47, 50, 56, 59, 61, 35, 36, 48, 49, 57, 58, 62, 63}};
static constexpr std::array<u8, 64> zagzig = {{0, 1, 8, 16, 9, 2, 3, 10, 17, 24, 32, 25, 18, 11, 4, 5,
12, 19, 26, 33, 40, 48, 41, 34, 27, 20, 13, 6, 7, 14, 21, 28,
35, 42, 49, 56, 57, 50, 43, 36, 29, 22, 15, 23, 30, 37, 44, 51,
58, 59, 52, 45, 38, 31, 39, 46, 53, 60, 61, 54, 47, 55, 62, 63}};
bool MDEC::rl_decode_block(s16* blk, const u16*& src, const u16* src_end, const u8* qt)
{
std::fill_n(blk, 64, s16(0));
// skip padding
u16 n;
for (;;)
@ -413,7 +416,7 @@ bool MDEC::rl_decode_block(s16* blk, const u16*& src, const u16* src_end, const
val = std::clamp(val, -0x400, 0x3FF);
// val = val * static_cast<s32>(ZeroExtend32(scalezag[i]));
if (q_scale > 0)
blk[zigzag[k]] = static_cast<s16>(val);
blk[zagzig[k]] = static_cast<s16>(val);
else if (q_scale == 0)
blk[k] = static_cast<s16>(val);
@ -490,13 +493,14 @@ void MDEC::yuv_to_rgb(u32 xx, u32 yy, const std::array<s16, 64>& Crblk, const st
G = static_cast<s16>(std::clamp(static_cast<int>(Y) + G, -128, 127));
B = static_cast<s16>(std::clamp(static_cast<int>(Y) + B, -128, 127));
// TODO: Signed output
R += 128;
G += 128;
B += 128;
rgb_out[(x + xx) + ((y + yy) * 16)] = ZeroExtend32(static_cast<u16>(R)) |
(ZeroExtend32(static_cast<u16>(G)) << 8) |
(ZeroExtend32(static_cast<u16>(B)) << 16) | UINT32_C(0xFF000000);
(ZeroExtend32(static_cast<u16>(B)) << 16);
}
}
}