static void
pdf_load_type5_shade(fz_shade *shade, pdf_document *xref, pdf_obj *dict,
int funcs, pdf_function **func)
{
fz_context *ctx = xref->ctx;
struct mesh_params p;
struct vertex *buf, *ref;
int first;
int ncomp;
int i, k;
fz_stream *stream;
pdf_load_mesh_params(xref, dict, &p);
if (funcs > 0)
{
ncomp = 1;
pdf_sample_shade_function(ctx, shade, funcs, func, p.c0[0], p.c1[0]);
}
else
ncomp = shade->colorspace->n;
ref = fz_malloc_array(ctx, p.vprow, sizeof(struct vertex));
buf = fz_malloc_array(ctx, p.vprow, sizeof(struct vertex));
first = 1;
stream = pdf_open_stream(xref, pdf_to_num(dict), pdf_to_gen(dict));
while (!fz_is_eof_bits(stream))
{
for (i = 0; i < p.vprow; i++)
{
buf[i].x = read_sample(stream, p.bpcoord, p.x0, p.x1);
buf[i].y = read_sample(stream, p.bpcoord, p.y0, p.y1);
for (k = 0; k < ncomp; k++)
buf[i].c[k] = read_sample(stream, p.bpcomp, p.c0[k], p.c1[k]);
}
if (!first)
for (i = 0; i < p.vprow - 1; i++)
pdf_add_quad(ctx, shade,
&ref[i], &ref[i+1], &buf[i+1], &buf[i]);
memcpy(ref, buf, p.vprow * sizeof(struct vertex));
first = 0;
}
fz_free(ctx, ref);
fz_free(ctx, buf);
fz_close(stream);
}
static void
pdf_load_type5_shade(fz_shade *shade, pdf_xref *xref, fz_obj *dict,
int funcs, pdf_function **func, fz_stream *stream)
{
struct mesh_params p;
struct vertex *buf, *ref;
int first;
int ncomp;
int i, k;
pdf_load_mesh_params(xref, dict, &p);
if (funcs > 0)
{
ncomp = 1;
pdf_sample_shade_function(shade, funcs, func, p.c0[0], p.c1[0]);
}
else
ncomp = shade->colorspace->n;
ref = fz_calloc(p.vprow, sizeof(struct vertex));
buf = fz_calloc(p.vprow, sizeof(struct vertex));
first = 1;
while (!fz_is_eof_bits(stream))
{
for (i = 0; i < p.vprow; i++)
{
buf[i].x = read_sample(stream, p.bpcoord, p.x0, p.x1);
buf[i].y = read_sample(stream, p.bpcoord, p.y0, p.y1);
for (k = 0; k < ncomp; k++)
buf[i].c[k] = read_sample(stream, p.bpcomp, p.c0[k], p.c1[k]);
}
if (!first)
for (i = 0; i < p.vprow - 1; i++)
pdf_add_quad(shade,
&ref[i], &ref[i+1], &buf[i+1], &buf[i]);
memcpy(ref, buf, p.vprow * sizeof(struct vertex));
first = 0;
}
free(ref);
free(buf);
}
static void
triangulate_patch(fz_context *ctx, pdf_tensor_patch p, fz_shade *shade)
{
struct vertex v0, v1, v2, v3;
v0.x = p.pole[0][0].x;
v0.y = p.pole[0][0].y;
memcpy(v0.c, p.color[0], sizeof(v0.c));
v1.x = p.pole[0][3].x;
v1.y = p.pole[0][3].y;
memcpy(v1.c, p.color[1], sizeof(v1.c));
v2.x = p.pole[3][3].x;
v2.y = p.pole[3][3].y;
memcpy(v2.c, p.color[2], sizeof(v2.c));
v3.x = p.pole[3][0].x;
v3.y = p.pole[3][0].y;
memcpy(v3.c, p.color[3], sizeof(v3.c));
pdf_add_quad(ctx, shade, &v0, &v1, &v2, &v3);
}
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]);
}
}
}