static inline void
split_patch(pdf_tensorpatch *s0, pdf_tensorpatch *s1, const pdf_tensorpatch *p)
{
split_curve_s(&p->pole[0][0], &s0->pole[0][0], &s1->pole[0][0], 4);
split_curve_s(&p->pole[0][1], &s0->pole[0][1], &s1->pole[0][1], 4);
split_curve_s(&p->pole[0][2], &s0->pole[0][2], &s1->pole[0][2], 4);
split_curve_s(&p->pole[0][3], &s0->pole[0][3], &s1->pole[0][3], 4);
copycolor(s0->color[0], p->color[0]);
midcolor(s0->color[1], p->color[0], p->color[1]);
midcolor(s0->color[2], p->color[2], p->color[3]);
copycolor(s0->color[3], p->color[3]);
copycolor(s1->color[0], s0->color[1]);
copycolor(s1->color[1], p->color[1]);
copycolor(s1->color[2], p->color[2]);
copycolor(s1->color[3], s0->color[2]);
}
static inline void
split_stripe(pdf_tensorpatch *s0, pdf_tensorpatch *s1, const pdf_tensorpatch *p)
{
split_curve_s(p->pole[0], s0->pole[0], s1->pole[0], 1);
split_curve_s(p->pole[1], s0->pole[1], s1->pole[1], 1);
split_curve_s(p->pole[2], s0->pole[2], s1->pole[2], 1);
split_curve_s(p->pole[3], s0->pole[3], s1->pole[3], 1);
copycolor(s0->color[0], p->color[0]);
copycolor(s0->color[1], p->color[1]);
midcolor(s0->color[2], p->color[1], p->color[2]);
midcolor(s0->color[3], p->color[0], p->color[3]);
copycolor(s1->color[0], s0->color[3]);
copycolor(s1->color[1], s0->color[2]);
copycolor(s1->color[2], p->color[2]);
copycolor(s1->color[3], p->color[3]);
}
static void
split_patch(pdf_tensor_patch *p, pdf_tensor_patch *s0, pdf_tensor_patch *s1)
{
/*
split all vertical bezier curves in patch,
creating two new patches with half the height.
*/
split_curve(p->pole[0], s0->pole[0], s1->pole[0], 1);
split_curve(p->pole[1], s0->pole[1], s1->pole[1], 1);
split_curve(p->pole[2], s0->pole[2], s1->pole[2], 1);
split_curve(p->pole[3], s0->pole[3], s1->pole[3], 1);
/* interpolate the colors for the two new patches. */
memcpy(s0->color[0], p->color[0], sizeof(s0->color[0]));
midcolor(s0->color[1], p->color[0], p->color[1]);
midcolor(s0->color[2], p->color[2], p->color[3]);
memcpy(s0->color[3], p->color[3], sizeof(s0->color[3]));
memcpy(s1->color[0], s0->color[1], sizeof(s1->color[0]));
memcpy(s1->color[1], p->color[1], sizeof(s1->color[1]));
memcpy(s1->color[2], p->color[2], sizeof(s1->color[2]));
memcpy(s1->color[3], s0->color[2], sizeof(s1->color[3]));
}
static void
split_stripe(pdf_tensor_patch *p, pdf_tensor_patch *s0, pdf_tensor_patch *s1)
{
/*
split all horizontal bezier curves in patch,
creating two new patches with half the width.
*/
split_curve(&p->pole[0][0], &s0->pole[0][0], &s1->pole[0][0], 4);
split_curve(&p->pole[0][1], &s0->pole[0][1], &s1->pole[0][1], 4);
split_curve(&p->pole[0][2], &s0->pole[0][2], &s1->pole[0][2], 4);
split_curve(&p->pole[0][3], &s0->pole[0][3], &s1->pole[0][3], 4);
/* interpolate the colors for the two new patches. */
memcpy(s0->color[0], p->color[0], sizeof(s0->color[0]));
memcpy(s0->color[1], p->color[1], sizeof(s0->color[1]));
midcolor(s0->color[2], p->color[1], p->color[2]);
midcolor(s0->color[3], p->color[0], p->color[3]);
memcpy(s1->color[0], s0->color[3], sizeof(s1->color[0]));
memcpy(s1->color[1], s0->color[2], sizeof(s1->color[1]));
memcpy(s1->color[2], p->color[2], sizeof(s1->color[2]));
memcpy(s1->color[3], p->color[3], sizeof(s1->color[3]));
}
