public void njUpsampleH(nj_component_t c)
{
int xmax = c.width - 3;
byte[] outv;
int lin = 0, lout = 0;
int x, y;
outv = new byte[(c.width * c.height) << 1];
if (outv == null)
{
njThrow(nj_result_t.NJ_OUT_OF_MEM);
}
for (y = c.height; y != 0; --y)
{
outv[lout] = CF(CF2A * c.pixels[lin] + CF2B * c.pixels[lin + 1]);
outv[lout + 1] = CF(CF3X * c.pixels[lin] + CF3Y * c.pixels[lin + 1] + CF3Z * c.pixels[lin + 2]);
outv[lout + 2] = CF(CF3A * c.pixels[lin] + CF3B * c.pixels[lin + 1] + CF3C * c.pixels[lin + 2]);
for (x = 0; x < xmax; ++x)
{
outv[lout + (x << 1) + 3] = CF(CF4A * c.pixels[lin + x] + CF4B * c.pixels[lin + x + 1] + CF4C * c.pixels[lin + x + 2] + CF4D * c.pixels[lin + x + 3]);
outv[lout + (x << 1) + 4] = CF(CF4D * c.pixels[lin + x] + CF4C * c.pixels[lin + x + 1] + CF4B * c.pixels[lin + x + 2] + CF4A * c.pixels[lin + x + 3]);
}
lin += c.stride;
lout += c.width << 1;
outv[lout + -3] = CF(CF3A * c.pixels[lin - 1] + CF3B * c.pixels[lin - 2] + CF3C * c.pixels[lin - 3]);
outv[lout + -2] = CF(CF3X * c.pixels[lin - 1] + CF3Y * c.pixels[lin - 2] + CF3Z * c.pixels[lin - 3]);
outv[lout + -1] = CF(CF2A * c.pixels[lin - 1] + CF2B * c.pixels[lin - 2]);
}
c.width <<= 1;
c.stride = c.width;
c.pixels = outv;
}
public void njUpsampleV(nj_component_t c)
{
int w = c.width, s1 = c.stride, s2 = s1 + s1;
byte[] outv;
int cin, cout;
int x, y;
outv = new byte[(c.width * c.height) << 1];
if (outv == null)
{
njThrow(nj_result_t.NJ_OUT_OF_MEM);
}
for (x = 0; x < w; ++x)
{
cin = x;
cout = x;
outv[cout] = CF(CF2A * c.pixels[cin] + CF2B * c.pixels[cin + s1]); cout += w;
outv[cout] = CF(CF3X * c.pixels[cin] + CF3Y * c.pixels[cin + s1] + CF3Z * c.pixels[cin + s2]); cout += w;
outv[cout] = CF(CF3A * c.pixels[cin] + CF3B * c.pixels[cin + s1] + CF3C * c.pixels[cin + s2]); cout += w;
cin += s1;
for (y = c.height - 3; y != 0; --y)
{
outv[cout] = CF(CF4A * c.pixels[cin + -s1] + CF4B * c.pixels[cin] + CF4C * c.pixels[cin + s1] + CF4D * c.pixels[cin + s2]); cout += w;
outv[cout] = CF(CF4D * c.pixels[cin + -s1] + CF4C * c.pixels[cin] + CF4B * c.pixels[cin + s1] + CF4A * c.pixels[cin + s2]); cout += w;
cin += s1;
}
cin += s1;
outv[cout] = CF(CF3A * c.pixels[cin] + CF3B * c.pixels[cin - s1] + CF3C * c.pixels[cin - s2]); cout += w;
outv[cout] = CF(CF3X * c.pixels[cin] + CF3Y * c.pixels[cin - s1] + CF3Z * c.pixels[cin - s2]); cout += w;
outv[cout] = CF(CF2A * c.pixels[cin] + CF2B * c.pixels[cin - s1]);
}
c.height <<= 1;
c.stride = c.width;
c.pixels = outv;
}
public void njDecodeBlock(nj_component_t c, int outv)
{
byte discard = 0;
byte code = 0;
int value, coef = 0;
nj.block = new int[64];
c.dcpred += njGetVLC(nj.vlctab[c.dctabsel], ref discard);
nj.block[0] = (c.dcpred) * nj.qtab[c.qtsel][0];
do
{
value = njGetVLC(nj.vlctab[c.actabsel], ref code);
if (code == 0)
{
break; // EOB
}
if ((code & 0x0F) == 0 && (code != 0xF0))
{
njThrow(nj_result_t.NJ_SYNTAX_ERROR);
}
coef += (code >> 4) + 1;
if (coef > 63)
{
njThrow(nj_result_t.NJ_SYNTAX_ERROR);
}
nj.block[(int)njZZ[coef]] = value * nj.qtab[c.qtsel][coef];
} while (coef < 63);
for (coef = 0; coef < 64; coef += 8)
{
njRowIDCT(nj.block, coef);
}
for (coef = 0; coef < 8; ++coef)
{
njColIDCT(nj.block, coef, c.pixels, outv + coef, c.stride);
}
}
