diff options
Diffstat (limited to 'source/pdf/pdf-page.c')
| -rw-r--r-- | source/pdf/pdf-page.c | 188 |
1 files changed, 163 insertions, 25 deletions
diff --git a/source/pdf/pdf-page.c b/source/pdf/pdf-page.c index 5b319e3a..9c7c8922 100644 --- a/source/pdf/pdf-page.c +++ b/source/pdf/pdf-page.c @@ -638,42 +638,115 @@ pdf_page_transform(fz_context *ctx, pdf_page *page, fz_rect *page_mediabox, fz_m pdf_page_obj_transform(ctx, page->obj, page_mediabox, page_ctm); } -fz_separations * -pdf_page_separations(fz_context *ctx, pdf_page *page) +static void +find_seps(fz_context *ctx, fz_separations **seps, pdf_obj *obj) { - pdf_obj *res = pdf_page_resources(ctx, page); - fz_separations *seps = NULL; - int i, len; + int i, n; + pdf_obj *nameobj = pdf_array_get(ctx, obj, 0); - res = pdf_dict_get(ctx, res, PDF_NAME_ColorSpace); - if (!res) - return NULL; + if (pdf_name_eq(ctx, nameobj, PDF_NAME_Separation)) + { + fz_colorspace *cs; + const char *name = pdf_to_name(ctx, pdf_array_get(ctx, obj, 1)); + + /* Skip 'special' colorants. */ + if (!strcmp(name, "Black") || + !strcmp(name, "Cyan") || + !strcmp(name, "Magenta") || + !strcmp(name, "Yellow") || + !strcmp(name, "All") || + !strcmp(name, "None")) + return; + + n = fz_count_separations(ctx, *seps); + for (i = 0; i < n; i++) + { + if (!strcmp(name, fz_separation_name(ctx, *seps, i))) + return; /* Got that one already */ + } - fz_var(seps); - fz_var(i); + cs = pdf_load_colorspace(ctx, obj); + if (!*seps) + *seps = fz_new_separations(ctx, 0); + fz_add_separation(ctx, *seps, name, cs, 0); + fz_drop_colorspace(ctx, cs); + } + else if (pdf_name_eq(ctx, nameobj, PDF_NAME_Indexed)) + { + find_seps(ctx, seps, pdf_array_get(ctx, obj, 1)); + } + else if (pdf_name_eq(ctx, nameobj, PDF_NAME_DeviceN)) + { + /* If the separation colorants exists for this DeviceN color space + * add those prior to our search for DeviceN color */ + pdf_obj *cols = pdf_dict_get(ctx, pdf_array_get(ctx, obj, 4), PDF_NAME_Colorants); + int i, n = pdf_dict_len(ctx, cols); + for (i = 0; i < n; i++) + find_seps(ctx, seps, pdf_dict_get_val(ctx, cols, i)); + } +} - len = pdf_dict_len(ctx, res); +static void +find_devn(fz_context *ctx, fz_separations **seps, pdf_obj *obj) +{ + int i, j, n, m; + pdf_obj *arr; + pdf_obj *nameobj = pdf_array_get(ctx, obj, 0); + + if (!pdf_name_eq(ctx, nameobj, PDF_NAME_DeviceN)) + return; + + arr = pdf_array_get(ctx, obj, 1); + m = pdf_array_len(ctx, arr); + for (j = 0; j < m; j++) + { + fz_colorspace *cs; + const char *name = pdf_to_name(ctx, pdf_array_get(ctx, arr, j)); + + /* Skip 'special' colorants. */ + if (!strcmp(name, "Black") || + !strcmp(name, "Cyan") || + !strcmp(name, "Magenta") || + !strcmp(name, "Yellow") || + !strcmp(name, "All") || + !strcmp(name, "None")) + continue; + + n = fz_count_separations(ctx, *seps); + for (i = 0; i < n; i++) + { + if (!strcmp(name, fz_separation_name(ctx, *seps, i))) + break; /* Got that one already */ + } + + if (i == n) + { + cs = pdf_load_colorspace(ctx, obj); + if (!*seps) + *seps = fz_new_separations(ctx, 0); + fz_add_separation(ctx, *seps, name, cs, j); + fz_drop_colorspace(ctx, cs); + } + } +} + +typedef void (res_finder_fn)(fz_context *ctx, fz_separations **seps, pdf_obj *obj); + +static void +search_res(fz_context *ctx, fz_separations **seps, pdf_obj *res, res_finder_fn *fn) +{ + int i = 0; + int len = pdf_dict_len(ctx, res); + + fz_var(i); - i = 0; while (i < len) { fz_try(ctx) { do { - pdf_obj *obj; - i++; - obj = pdf_dict_get_val(ctx, res, i-1); - - if (pdf_name_eq(ctx, pdf_array_get(ctx, obj, 0), PDF_NAME_Separation)) - { - uint32_t rgba = 0; /* FIXME */ - uint32_t cmyk = 0; /* FIXME */ - const char *name = pdf_to_name(ctx, pdf_array_get(ctx, obj, 1)); - if (!seps) - seps = fz_new_separations(ctx, 0); - fz_add_separation(ctx, seps, rgba, cmyk, name); - } + fn(ctx, seps, pdf_dict_get_val(ctx, res, i++)); } while (i < len); } @@ -682,6 +755,71 @@ pdf_page_separations(fz_context *ctx, pdf_page *page) /* Don't die because a single separation failed to load */ } } +} + +static void +scan_page_seps(fz_context *ctx, pdf_obj *res, fz_separations **seps, res_finder_fn *fn) +{ + pdf_obj *forms; + pdf_obj *sh; + pdf_obj *xo = NULL; + int i, len; + + fz_var(xo); + + if (pdf_mark_obj(ctx, res)) + fz_throw(ctx, FZ_ERROR_GENERIC, "cycle in resources"); + + fz_try(ctx) + { + search_res(ctx, seps, pdf_dict_get(ctx, res, PDF_NAME_ColorSpace), fn); + + sh = pdf_dict_get(ctx, res, PDF_NAME_Shading); + len = pdf_dict_len(ctx, sh); + for (i = 0; i < len; i++) + fn(ctx, seps, pdf_dict_get(ctx, pdf_dict_get_val(ctx, sh, i), PDF_NAME_ColorSpace)); + + forms = pdf_dict_get(ctx, res, PDF_NAME_XObject); + len = pdf_dict_len(ctx, forms); + + /* Recurse on the forms. Throw if we cycle */ + for (i = 0; i < len; i++) + { + xo = pdf_dict_get_val(ctx, forms, i++); + + if (pdf_mark_obj(ctx, xo)) + fz_throw(ctx, FZ_ERROR_GENERIC, "cycle in forms"); + + scan_page_seps(ctx, pdf_dict_get(ctx, xo, PDF_NAME_Resources), seps, fn); + pdf_unmark_obj(ctx, xo); + xo = NULL; + } + } + fz_always(ctx) + { + pdf_unmark_obj(ctx, xo); + pdf_unmark_obj(ctx, res); + } + fz_catch(ctx) + fz_rethrow(ctx); +} + +fz_separations * +pdf_page_separations(fz_context *ctx, pdf_page *page) +{ + pdf_obj *res = pdf_page_resources(ctx, page); + fz_separations *seps = NULL; + + /* Run through and look for separations first. This is + * because separations are simplest to deal with, and + * because DeviceN may be implemented on top of separations. + */ + scan_page_seps(ctx, res, &seps, find_seps); + + /* Now run through again, and look for DeviceNs. These may + * have spot colors in that aren't defined in terms of + * separations. */ + scan_page_seps(ctx, res, &seps, find_devn); return seps; } |