diff options
Diffstat (limited to 'source/pdf/pdf-xobject.c')
| -rw-r--r-- | source/pdf/pdf-xobject.c | 232 |
1 files changed, 232 insertions, 0 deletions
diff --git a/source/pdf/pdf-xobject.c b/source/pdf/pdf-xobject.c new file mode 100644 index 00000000..61fc876a --- /dev/null +++ b/source/pdf/pdf-xobject.c @@ -0,0 +1,232 @@ +#include "mupdf/pdf.h" + +pdf_xobject * +pdf_keep_xobject(fz_context *ctx, pdf_xobject *xobj) +{ + return (pdf_xobject *)fz_keep_storable(ctx, &xobj->storable); +} + +void +pdf_drop_xobject(fz_context *ctx, pdf_xobject *xobj) +{ + fz_drop_storable(ctx, &xobj->storable); +} + +static void +pdf_free_xobject_imp(fz_context *ctx, fz_storable *xobj_) +{ + pdf_xobject *xobj = (pdf_xobject *)xobj_; + + if (xobj->colorspace) + fz_drop_colorspace(ctx, xobj->colorspace); + pdf_drop_obj(xobj->resources); + pdf_drop_obj(xobj->contents); + pdf_drop_obj(xobj->me); + fz_free(ctx, xobj); +} + +static unsigned int +pdf_xobject_size(pdf_xobject *xobj) +{ + if (xobj == NULL) + return 0; + return sizeof(*xobj) + (xobj->colorspace ? xobj->colorspace->size : 0); +} + +pdf_xobject * +pdf_load_xobject(pdf_document *xref, pdf_obj *dict) +{ + pdf_xobject *form; + pdf_obj *obj; + fz_context *ctx = xref->ctx; + + if ((form = pdf_find_item(ctx, pdf_free_xobject_imp, dict))) + { + return form; + } + + form = fz_malloc_struct(ctx, pdf_xobject); + FZ_INIT_STORABLE(form, 1, pdf_free_xobject_imp); + form->resources = NULL; + form->contents = NULL; + form->colorspace = NULL; + form->me = NULL; + form->iteration = 0; + + /* Store item immediately, to avoid possible recursion if objects refer back to this one */ + pdf_store_item(ctx, dict, form, pdf_xobject_size(form)); + + fz_try(ctx) + { + obj = pdf_dict_gets(dict, "BBox"); + pdf_to_rect(ctx, obj, &form->bbox); + + obj = pdf_dict_gets(dict, "Matrix"); + if (obj) + pdf_to_matrix(ctx, obj, &form->matrix); + else + form->matrix = fz_identity; + + form->isolated = 0; + form->knockout = 0; + form->transparency = 0; + + obj = pdf_dict_gets(dict, "Group"); + if (obj) + { + pdf_obj *attrs = obj; + + form->isolated = pdf_to_bool(pdf_dict_gets(attrs, "I")); + form->knockout = pdf_to_bool(pdf_dict_gets(attrs, "K")); + + obj = pdf_dict_gets(attrs, "S"); + if (pdf_is_name(obj) && !strcmp(pdf_to_name(obj), "Transparency")) + form->transparency = 1; + + obj = pdf_dict_gets(attrs, "CS"); + if (obj) + { + form->colorspace = pdf_load_colorspace(xref, obj); + if (!form->colorspace) + fz_throw(ctx, FZ_ERROR_GENERIC, "cannot load xobject colorspace"); + } + } + + form->resources = pdf_dict_gets(dict, "Resources"); + if (form->resources) + pdf_keep_obj(form->resources); + + form->contents = pdf_keep_obj(dict); + } + fz_catch(ctx) + { + pdf_remove_item(ctx, pdf_free_xobject_imp, dict); + pdf_drop_xobject(ctx, form); + fz_rethrow_message(ctx, "cannot load xobject content stream (%d %d R)", pdf_to_num(dict), pdf_to_gen(dict)); + } + form->me = pdf_keep_obj(dict); + + return form; +} + +pdf_obj * +pdf_new_xobject(pdf_document *xref, const fz_rect *bbox, const fz_matrix *mat) +{ + int idict_num; + pdf_obj *idict = NULL; + pdf_obj *dict = NULL; + pdf_xobject *form = NULL; + pdf_obj *obj = NULL; + pdf_obj *res = NULL; + pdf_obj *procset = NULL; + fz_context *ctx = xref->ctx; + + fz_var(idict); + fz_var(dict); + fz_var(form); + fz_var(obj); + fz_var(res); + fz_var(procset); + fz_try(ctx) + { + dict = pdf_new_dict(ctx, 0); + + obj = pdf_new_rect(ctx, bbox); + pdf_dict_puts(dict, "BBox", obj); + pdf_drop_obj(obj); + obj = NULL; + + obj = pdf_new_int(ctx, 1); + pdf_dict_puts(dict, "FormType", obj); + pdf_drop_obj(obj); + obj = NULL; + + obj = pdf_new_int(ctx, 0); + pdf_dict_puts(dict, "Length", obj); + pdf_drop_obj(obj); + obj = NULL; + + obj = pdf_new_matrix(ctx, mat); + pdf_dict_puts(dict, "Matrix", obj); + pdf_drop_obj(obj); + obj = NULL; + + res = pdf_new_dict(ctx, 0); + procset = pdf_new_array(ctx, 2); + obj = pdf_new_name(ctx, "PDF"); + pdf_array_push(procset, obj); + pdf_drop_obj(obj); + obj = NULL; + obj = pdf_new_name(ctx, "Text"); + pdf_array_push(procset, obj); + pdf_drop_obj(obj); + obj = NULL; + pdf_dict_puts(res, "ProcSet", procset); + pdf_drop_obj(procset); + procset = NULL; + pdf_dict_puts(dict, "Resources", res); + + obj = pdf_new_name(ctx, "Form"); + pdf_dict_puts(dict, "Subtype", obj); + pdf_drop_obj(obj); + obj = NULL; + + obj = pdf_new_name(ctx, "XObject"); + pdf_dict_puts(dict, "Type", obj); + pdf_drop_obj(obj); + obj = NULL; + + form = fz_malloc_struct(ctx, pdf_xobject); + FZ_INIT_STORABLE(form, 1, pdf_free_xobject_imp); + form->resources = NULL; + form->contents = NULL; + form->colorspace = NULL; + form->me = NULL; + form->iteration = 0; + + form->bbox = *bbox; + + form->matrix = *mat; + + form->isolated = 0; + form->knockout = 0; + form->transparency = 0; + + form->resources = res; + res = NULL; + + idict_num = pdf_create_object(xref); + pdf_update_object(xref, idict_num, dict); + idict = pdf_new_indirect(ctx, idict_num, 0, xref); + pdf_drop_obj(dict); + dict = NULL; + + pdf_store_item(ctx, idict, form, pdf_xobject_size(form)); + + form->contents = pdf_keep_obj(idict); + form->me = pdf_keep_obj(idict); + + pdf_drop_xobject(ctx, form); + form = NULL; + } + fz_catch(ctx) + { + pdf_drop_obj(procset); + pdf_drop_obj(res); + pdf_drop_obj(obj); + pdf_drop_obj(dict); + pdf_drop_obj(idict); + pdf_drop_xobject(ctx, form); + fz_rethrow_message(ctx, "failed to create xobject)"); + } + + return idict; +} + +void pdf_update_xobject_contents(pdf_document *xref, pdf_xobject *form, fz_buffer *buffer) +{ + pdf_dict_dels(form->contents, "Filter"); + pdf_dict_puts_drop(form->contents, "Length", pdf_new_int(xref->ctx, buffer->len)); + pdf_update_stream(xref, pdf_to_num(form->contents), buffer); + form->iteration ++; +} |