void f0r_update2(f0r_instance_t instance, double time, const uint32_t* inframe1,
const uint32_t* inframe2, const uint32_t* inframe3, uint32_t* outframe)
{
assert(instance);
cairo_affineblend_instance_t* inst = (cairo_affineblend_instance_t*) instance;
unsigned char* src = (unsigned char*)inframe1;
unsigned char* dst = (unsigned char*)inframe2;
unsigned char* out = (unsigned char*)outframe;
draw_composite (inst, out, src, dst, time);
}
void f0r_update2(f0r_instance_t instance, double time, const uint32_t* inframe1,
const uint32_t* inframe2, const uint32_t* inframe3, uint32_t* outframe)
{
assert(instance);
cairo_blend_instance_t* inst = (cairo_blend_instance_t*) instance;
unsigned char* dst = (unsigned char*)inframe1;
unsigned char* src = (unsigned char*)inframe2;
unsigned char* out = (unsigned char*)outframe;
int pixels = inst->width * inst->height;
frei0r_cairo_premultiply_rgba (dst, pixels, 0xff);
frei0r_cairo_premultiply_rgba (src, pixels, -1);
draw_composite (inst, out, dst, src, time);
frei0r_cairo_unpremultiply_rgba (out, pixels);
}