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/* this file contains a template for the RGB color filter algorithm
* it is included several times by "ftrgb.c"
*/
#ifndef OFF_R
#error "OFF_R must be defined as the offset of the red channel"
#endif
#ifndef OFF_G
#error "OFF_G must be defiend as the offset of the green channel"
#endif
#ifndef OFF_B
#error "OFF_B must be defined as the offset of the blue channel"
#endif
#ifndef HMUL
#error "HMUL must be defined as the horizontal multiplier, either 1 or 3"
#endif
#ifndef VMUL
#error "VMUL must be defined as the vertical multipler, either 1 or 3"
#endif
int hh = oper->height;
FT_Byte* in_line = oper->in_line;
FT_Long in_pitch = oper->in_pitch;
FT_Byte* out_line = oper->out_line;
FT_Long out_pitch = oper->out_pitch;
FT_Fixed* mults = oper->factors;
for ( ; hh > 0; hh--, in_line += in_pitch*VMUL, out_line += out_pitch )
{
int ww = oper->width;
FT_Byte* read = in_line;
FT_UInt32* write = (FT_UInt32*)out_line;
for ( ; ww > 0; ww--, read += HMUL, write += 1 )
{
FT_UInt rr, gg, bb;
FT_UInt val;
val = read[OFF_R];
rr = mults[0]*val;
gg = mults[3]*val;
bb = mults[6]*val;
val = read[OFF_G];
rr += mults[1]*val;
gg += mults[4]*val;
bb += mults[7]*val;
val = read[OFF_B];
rr += mults[2]*val;
gg += mults[5]*val;
bb += mults[8]*val;
rr = (rr >> 16) & 255;
gg = (gg >> 16) & 255;
bb = (bb >> 16) & 255;
write[0] = (FT_UInt)( (gg << 24) | (rr << 16) | (gg << 8) | bb );
}
}
#undef OFF_R
#undef OFF_G
#undef OFF_B
#undef HMUL
#undef VMUL
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