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(XTX): use DxtDecoder.

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This commit is contained in:
morkt 2017-04-14 09:53:00 +04:00
parent 0cb1783363
commit d51e45e476
1 changed files with 2 additions and 103 deletions
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105
ArcFormats/Cri/ImageXTX.cs
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@ -197,7 +197,8 @@ namespace GameRes.Formats.Cri
src += 2;
}
}
UnpackDXT5 (packed);
var dxt = new DirectDraw.DxtDecoder (packed, m_info);
m_output = dxt.UnpackDXT5();
}
static int GetY (int i, int width, byte level)
@ -221,107 +222,5 @@ namespace GameRes.Formats.Cri
+ ((((((v2 >> 6) & 0xFF) + ((v3 >> (v1 + 5)) & 0xFE)) & 3)
+ (((v3 >> (v1 + 7)) % (((width + 31)) >> 5)) << 2)) << 3);
}
void UnpackDXT5 (byte[] input)
{
int src = 0;
for (int y = 0; y < m_info.AlignedHeight; y += 4)
for (int x = 0; x < m_info.AlignedWidth; x += 4)
{
DecompressDXT5Block (input, src, y, x);
src += 16;
}
}
byte[] m_dxt5_alpha = new byte[16];
void DecompressDXT5Block (byte[] input, int src, int block_y, int block_x)
{
byte alpha0 = input[src];
byte alpha1 = input[src+1];
DecompressDXT5Alpha (input, src+2, m_dxt5_alpha);
ushort color0 = LittleEndian.ToUInt16 (input, src+8);
ushort color1 = LittleEndian.ToUInt16 (input, src+10);
int t = (color0 >> 11) * 255 + 16;
byte r0 = (byte)((t / 32 + t) / 32);
t = ((color0 & 0x07E0) >> 5) * 255 + 32;
byte g0 = (byte)((t / 64 + t) / 64);
t = (color0 & 0x001F) * 255 + 16;
byte b0 = (byte)((t / 32 + t) / 32);
t = (color1 >> 11) * 255 + 16;
byte r1 = (byte)((t / 32 + t) / 32);
t = ((color1 & 0x07E0) >> 5) * 255 + 32;
byte g1 = (byte)((t / 64 + t) / 64);
t = (color1 & 0x001F) * 255 + 16;
byte b1 = (byte)((t / 32 + t) / 32);
uint code = LittleEndian.ToUInt32 (input, src+12);
for (int y = 0; y < 4 && (block_y + y) < m_height; ++y)
for (int x = 0; x < 4 && (block_x + x) < m_width; ++x)
{
int alpha_code = m_dxt5_alpha[4 * y + x];
byte alpha;
if (0 == alpha_code)
alpha = alpha0;
else if (1 == alpha_code)
alpha = alpha1;
else if (alpha0 > alpha1)
alpha = (byte)(((8 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 7);
else if (6 == alpha_code)
alpha = 0;
else if (7 == alpha_code)
alpha = 0xFF;
else
alpha = (byte)(((6 - alpha_code) * alpha0 + (alpha_code - 1) * alpha1) / 5);
int dst = m_output_stride * (block_y + y) + (block_x + x) * 4;
switch (code & 3)
{
case 0:
PutPixel (dst, r0, g0, b0, alpha);
break;
case 1:
PutPixel (dst, r1, g1, b1, alpha);
break;
case 2:
PutPixel (dst, (byte)((2 * r0 + r1) / 3), (byte)((2 * g0 + g1) / 3), (byte)((2 * b0 + b1) / 3), alpha);
break;
case 3:
PutPixel (dst, (byte)((r0 + 2 * r1) / 3), (byte)((g0 + 2 * g1) / 3), (byte)((b0 + 2 * b1) / 3), alpha);
break;
}
code >>= 2;
}
}
static void DecompressDXT5Alpha (byte[] input, int src, byte[] output)
{
int dst = 0;
for (int j = 0; j < 2; ++j)
{
int block = input[src++];
block |= input[src++] << 8;
block |= input[src++] << 16;
for (int i = 0; i < 8; ++i)
{
output[dst++] = (byte)(block & 7);
block >>= 3;
}
}
}
void PutPixel (int dst, byte r, byte g, byte b, byte a)
{
m_output[dst] = b;
m_output[dst+1] = g;
m_output[dst+2] = r;
m_output[dst+3] = a;
}
}
}