static void
separation_to_rgb(fz_context *ctx, fz_colorspace *cs, float *color, float *rgb)
{
struct separation *sep = cs->data;
float alt[FZ_MAX_COLORS];
pdf_eval_function(ctx, sep->tint, color, cs->n, alt, sep->base->n);
sep->base->to_rgb(ctx, sep->base, alt, rgb);
}
static void
pdf_sample_composite_shade_function(fz_context *ctx, fz_shade *shade, pdf_function *func, float t0, float t1)
{
int i;
float t;
for (i = 0; i < 256; i++)
{
t = t0 + (i / 255.0f) * (t1 - t0);
pdf_eval_function(ctx, func, &t, 1, shade->function[i], shade->colorspace->n);
shade->function[i][shade->colorspace->n] = 1;
}
}
static void
pdf_sample_component_shade_function(fz_context *ctx, fz_shade *shade, int funcs, pdf_function **func, float t0, float t1)
{
int i, k;
float t;
for (i = 0; i < 256; i++)
{
t = t0 + (i / 255.0f) * (t1 - t0);
for (k = 0; k < funcs; k++)
pdf_eval_function(ctx, func[k], &t, 1, &shade->function[i][k], 1);
shade->function[i][k] = 1;
}
}
static void
pdf_load_function_based_shading(fz_context *ctx, pdf_document *doc, fz_shade *shade, pdf_obj *dict, pdf_function *func)
{
pdf_obj *obj;
float x0, y0, x1, y1;
float fv[2];
fz_matrix matrix;
int xx, yy;
float *p;
int n = fz_colorspace_n(ctx, shade->colorspace);
x0 = y0 = 0;
x1 = y1 = 1;
obj = pdf_dict_get(ctx, dict, PDF_NAME(Domain));
if (obj)
{
x0 = pdf_array_get_real(ctx, obj, 0);
x1 = pdf_array_get_real(ctx, obj, 1);
y0 = pdf_array_get_real(ctx, obj, 2);
y1 = pdf_array_get_real(ctx, obj, 3);
}
obj = pdf_dict_get(ctx, dict, PDF_NAME(Matrix));
if (obj)
pdf_to_matrix(ctx, obj, &matrix);
else
matrix = fz_identity;
shade->u.f.matrix = matrix;
shade->u.f.xdivs = FUNSEGS;
shade->u.f.ydivs = FUNSEGS;
shade->u.f.fn_vals = fz_malloc(ctx, (FUNSEGS+1)*(FUNSEGS+1)*n*sizeof(float));
shade->u.f.domain[0][0] = x0;
shade->u.f.domain[0][1] = y0;
shade->u.f.domain[1][0] = x1;
shade->u.f.domain[1][1] = y1;
p = shade->u.f.fn_vals;
for (yy = 0; yy <= FUNSEGS; yy++)
{
fv[1] = y0 + (y1 - y0) * yy / FUNSEGS;
for (xx = 0; xx <= FUNSEGS; xx++)
{
fv[0] = x0 + (x1 - x0) * xx / FUNSEGS;
pdf_eval_function(ctx, func, fv, 2, p, n);
p += n;
}
}
}
static void
pdf_load_function_based_shading(fz_shade *shade, pdf_document *xref, pdf_obj *dict, pdf_function *func)
{
pdf_obj *obj;
float x0, y0, x1, y1;
float fv[2];
fz_matrix matrix;
int xx, yy;
fz_context *ctx = xref->ctx;
float *p;
x0 = y0 = 0;
x1 = y1 = 1;
obj = pdf_dict_gets(dict, "Domain");
if (obj)
{
x0 = pdf_to_real(pdf_array_get(obj, 0));
x1 = pdf_to_real(pdf_array_get(obj, 1));
y0 = pdf_to_real(pdf_array_get(obj, 2));
y1 = pdf_to_real(pdf_array_get(obj, 3));
}
matrix = fz_identity;
obj = pdf_dict_gets(dict, "Matrix");
if (obj)
matrix = pdf_to_matrix(ctx, obj);
shade->u.f.matrix = matrix;
shade->u.f.xdivs = FUNSEGS;
shade->u.f.ydivs = FUNSEGS;
shade->u.f.fn_vals = fz_malloc(ctx, (FUNSEGS+1)*(FUNSEGS+1)*shade->colorspace->n*sizeof(float));
shade->u.f.domain[0][0] = x0;
shade->u.f.domain[0][1] = y0;
shade->u.f.domain[1][0] = x1;
shade->u.f.domain[1][1] = y1;
p = shade->u.f.fn_vals;
for (yy = 0; yy <= FUNSEGS; yy++)
{
fv[1] = y0 + (y1 - y0) * yy / FUNSEGS;
for (xx = 0; xx <= FUNSEGS; xx++)
{
fv[0] = x0 + (x1 - x0) * xx / FUNSEGS;
pdf_eval_function(ctx, func, fv, 2, p, shade->colorspace->n);
p += shade->colorspace->n;
}
}
}
static void
pdf_load_function_based_shading(fz_shade *shade, pdf_document *xref, pdf_obj *dict, pdf_function *func)
{
pdf_obj *obj;
float x0, y0, x1, y1;
fz_matrix matrix;
struct vertex v[4];
int xx, yy;
float x, y;
float xn, yn;
int i;
fz_context *ctx = xref->ctx;
x0 = y0 = 0;
x1 = y1 = 1;
obj = pdf_dict_gets(dict, "Domain");
if (pdf_array_len(obj) == 4)
{
x0 = pdf_to_real(pdf_array_get(obj, 0));
x1 = pdf_to_real(pdf_array_get(obj, 1));
y0 = pdf_to_real(pdf_array_get(obj, 2));
y1 = pdf_to_real(pdf_array_get(obj, 3));
}
matrix = fz_identity;
obj = pdf_dict_gets(dict, "Matrix");
if (pdf_array_len(obj) == 6)
matrix = pdf_to_matrix(ctx, obj);
for (yy = 0; yy < FUNSEGS; yy++)
{
y = y0 + (y1 - y0) * yy / FUNSEGS;
yn = y0 + (y1 - y0) * (yy + 1) / FUNSEGS;
for (xx = 0; xx < FUNSEGS; xx++)
{
x = x0 + (x1 - x0) * xx / FUNSEGS;
xn = x0 + (x1 - x0) * (xx + 1) / FUNSEGS;
v[0].x = x; v[0].y = y;
v[1].x = xn; v[1].y = y;
v[2].x = xn; v[2].y = yn;
v[3].x = x; v[3].y = yn;
for (i = 0; i < 4; i++)
{
fz_point pt;
float fv[2];
fv[0] = v[i].x;
fv[1] = v[i].y;
pdf_eval_function(ctx, func, fv, 2, v[i].c, shade->colorspace->n);
pt.x = v[i].x;
pt.y = v[i].y;
pt = fz_transform_point(matrix, pt);
v[i].x = pt.x;
v[i].y = pt.y;
}
pdf_add_quad(ctx, shade, &v[0], &v[1], &v[2], &v[3]);
}
}
}