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#include <fitz.h>
/* Porter-Duff compositing arithmetic on premultiplied ARGB buffers */
void
fz_blendover(unsigned char *C, unsigned char *A, unsigned char *B, int n)
{
while (n--)
{
unsigned char Fa = 255;
unsigned char Fb = 255 - A[0];
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
}
}
void
fz_blendin(unsigned char *C, unsigned char *A, unsigned char *B, int n)
{
while (n--)
{
unsigned char Fa = B[0];
unsigned char Fb = 0;
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
}
}
void
fz_blendout(unsigned char *C, unsigned char *A, unsigned char *B, int n)
{
while (n--)
{
unsigned char Fa = 255 - B[0];
unsigned char Fb = 0;
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
}
}
void
fz_blendatop(unsigned char *C, unsigned char *A, unsigned char *B, int n)
{
while (n--)
{
unsigned char Fa = B[0];
unsigned char Fb = 255 - A[0];
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
}
}
void
fz_blendxor(unsigned char *C, unsigned char *A, unsigned char *B, int n)
{
while (n--)
{
unsigned char Fa = 255 - B[0];
unsigned char Fb = 255 - A[0];
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
*C++ = fz_mul255(*A++, Fa) + fz_mul255(*B++, Fb);
}
}
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