int
pdf_resolve_link(fz_context *ctx, pdf_document *doc, const char *uri, float *xp, float *yp)
{
if (uri && uri[0] == '#')
{
int page = fz_atoi(uri + 1) - 1;
if (xp || yp)
{
const char *x = strchr(uri, ',');
const char *y = strrchr(uri, ',');
if (x && y)
{
pdf_obj *obj;
fz_matrix ctm;
fz_point p;
p.x = x ? fz_atoi(x + 1) : 0;
p.y = y ? fz_atoi(y + 1) : 0;
obj = pdf_lookup_page_obj(ctx, doc, page);
pdf_page_obj_transform(ctx, obj, NULL, &ctm);
fz_transform_point(&p, &ctm);
if (xp) *xp = p.x;
if (yp) *yp = p.y;
}
}
return page;
}
fz_warn(ctx, "unknown link uri '%s'", uri);
return -1;
}
char *
pdf_parse_link_dest(fz_context *ctx, pdf_document *doc, pdf_obj *dest)
{
pdf_obj *obj, *pageobj;
fz_rect mediabox;
fz_matrix pagectm;
const char *ld;
int page, x, y, h;
dest = resolve_dest(ctx, doc, dest);
if (dest == NULL)
{
fz_warn(ctx, "undefined link destination");
return NULL;
}
if (pdf_is_name(ctx, dest))
{
ld = pdf_to_name(ctx, dest);
return fz_strdup(ctx, ld);
}
else if (pdf_is_string(ctx, dest))
{
ld = pdf_to_str_buf(ctx, dest);
return fz_strdup(ctx, ld);
}
pageobj = pdf_array_get(ctx, dest, 0);
if (pdf_is_int(ctx, pageobj))
{
page = pdf_to_int(ctx, pageobj);
pageobj = pdf_lookup_page_obj(ctx, doc, page);
}
else
{
fz_try(ctx)
page = pdf_lookup_page_number(ctx, doc, pageobj);
fz_catch(ctx)
page = -1;
}
if (page < 0)
return NULL;
obj = pdf_array_get(ctx, dest, 1);
if (obj)
{
/* Link coords use a coordinate space that does not seem to respect Rotate or UserUnit. */
/* All we need to do is figure out the page height to flip the coordinate space. */
pdf_page_obj_transform(ctx, pageobj, &mediabox, &pagectm);
mediabox = fz_transform_rect(mediabox, pagectm);
h = mediabox.y1 - mediabox.y0;
if (pdf_name_eq(ctx, obj, PDF_NAME(XYZ)))
{
x = pdf_array_get_int(ctx, dest, 2);
y = h - pdf_array_get_int(ctx, dest, 3);
}
else if (pdf_name_eq(ctx, obj, PDF_NAME(FitR)))
{
x = pdf_array_get_int(ctx, dest, 2);
y = h - pdf_array_get_int(ctx, dest, 5);
}
else if (pdf_name_eq(ctx, obj, PDF_NAME(FitH)) || pdf_name_eq(ctx, obj, PDF_NAME(FitBH)))
{
x = 0;
y = h - pdf_array_get_int(ctx, dest, 2);
}
else if (pdf_name_eq(ctx, obj, PDF_NAME(FitV)) || pdf_name_eq(ctx, obj, PDF_NAME(FitBV)))
{
x = pdf_array_get_int(ctx, dest, 2);
y = 0;
}
else
{
x = 0;
y = 0;
}
return fz_asprintf(ctx, "#%d,%d,%d", page + 1, x, y);
}
return fz_asprintf(ctx, "#%d", page + 1);
}
