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%{
/*
# ------------------------------------------------------------------------
# Copyright 2020-2022, Harald Lieder, mailto:harald.lieder@outlook.com
# License: GNU AFFERO GPL 3.0, https://www.gnu.org/licenses/agpl-3.0.html
#
# Part of "PyMuPDF", a Python binding for "MuPDF" (http://mupdf.com), a
# lightweight PDF, XPS, and E-book viewer, renderer and toolkit which is
# maintained and developed by Artifex Software, Inc. https://artifex.com.
# ------------------------------------------------------------------------
*/
//-----------------------------------------------------------------------------
// Read and concatenate a PDF page's /Conents object(s) in a buffer
//-----------------------------------------------------------------------------
fz_buffer *JM_read_contents(fz_context * ctx, pdf_obj * pageref)
{
fz_buffer *res = NULL, *nres = NULL;
int i;
fz_try(ctx) {
pdf_obj *contents = pdf_dict_get(ctx, pageref, PDF_NAME(Contents));
if (pdf_is_array(ctx, contents)) {
res = fz_new_buffer(ctx, 1024);
for (i = 0; i < pdf_array_len(ctx, contents); i++) {
nres = pdf_load_stream(ctx, pdf_array_get(ctx, contents, i));
fz_append_buffer(ctx, res, nres);
fz_drop_buffer(ctx, nres);
}
}
else if (contents) {
res = pdf_load_stream(ctx, contents);
}
}
fz_catch(ctx) {
fz_rethrow(ctx);
}
return res;
}
//-----------------------------------------------------------------------------
// Make an XObject from a PDF page
// For a positive xref assume that its object can be used instead
//-----------------------------------------------------------------------------
pdf_obj *JM_xobject_from_page(fz_context * ctx, pdf_document * pdfout, fz_page * fsrcpage, int xref, pdf_graft_map *gmap)
{
pdf_obj *xobj1, *resources = NULL, *o, *spageref;
fz_try(ctx) {
if (xref > 0) {
xobj1 = pdf_new_indirect(ctx, pdfout, xref, 0);
} else {
fz_buffer *res = NULL;
fz_rect mediabox;
pdf_page *srcpage = pdf_page_from_fz_page(ctx, fsrcpage);
spageref = srcpage->obj;
mediabox = pdf_to_rect(ctx, pdf_dict_get_inheritable(ctx, spageref, PDF_NAME(MediaBox)));
// Deep-copy resources object of source page
o = pdf_dict_get_inheritable(ctx, spageref, PDF_NAME(Resources));
if (gmap) // use graftmap when possible
resources = pdf_graft_mapped_object(ctx, gmap, o);
else
resources = pdf_graft_object(ctx, pdfout, o);
// get spgage contents source
res = JM_read_contents(ctx, spageref);
//-------------------------------------------------------------
// create XObject representing the source page
//-------------------------------------------------------------
xobj1 = pdf_new_xobject(ctx, pdfout, mediabox, fz_identity, NULL, res);
// store spage contents
JM_update_stream(ctx, pdfout, xobj1, res, 1);
fz_drop_buffer(ctx, res);
// store spage resources
pdf_dict_put_drop(ctx, xobj1, PDF_NAME(Resources), resources);
}
}
fz_catch(ctx) {
fz_rethrow(ctx);
}
return xobj1;
}
//-----------------------------------------------------------------------------
// Insert a buffer as a new separate /Contents object of a page.
// 1. Create a new stream object from buffer 'newcont'
// 2. If /Contents already is an array, then just prepend or append this object
// 3. Else, create new array and put old content obj and this object into it.
// If the page had no /Contents before, just create a 1-item array.
//-----------------------------------------------------------------------------
int JM_insert_contents(fz_context * ctx, pdf_document * pdf,
pdf_obj * pageref, fz_buffer * newcont, int overlay)
{
int xref = 0;
pdf_obj *newconts = NULL;
pdf_obj *carr = NULL;
fz_var(newconts);
fz_var(carr);
fz_try(ctx) {
pdf_obj *contents = pdf_dict_get(ctx, pageref, PDF_NAME(Contents));
newconts = pdf_add_stream(ctx, pdf, newcont, NULL, 0);
xref = pdf_to_num(ctx, newconts);
if (pdf_is_array(ctx, contents)) {
if (overlay) // append new object
pdf_array_push(ctx, contents, newconts);
else // prepend new object
pdf_array_insert(ctx, contents, newconts, 0);
} else {
carr = pdf_new_array(ctx, pdf, 5);
if (overlay) {
if (contents)
pdf_array_push(ctx, carr, contents);
pdf_array_push(ctx, carr, newconts);
} else {
pdf_array_push(ctx, carr, newconts);
if (contents)
pdf_array_push(ctx, carr, contents);
}
pdf_dict_put(ctx, pageref, PDF_NAME(Contents), carr);
}
}
fz_always(ctx) {
pdf_drop_obj(ctx, newconts);
pdf_drop_obj(ctx, carr);
}
fz_catch(ctx) {
fz_rethrow(ctx);
}
return xref;
}
static PyObject *img_info = NULL;
static fz_image *
JM_image_filter(fz_context *ctx, void *opaque, fz_matrix ctm, const char *name, fz_image *image)
{
fz_quad q = fz_transform_quad(fz_quad_from_rect(fz_unit_rect), ctm);
PyObject *temp = Py_BuildValue("sN", name, JM_py_from_quad(q));
LIST_APPEND_DROP(img_info, temp);
return NULL;
}
void
JM_filter_content_stream(
fz_context * ctx,
pdf_document * doc,
pdf_obj * in_stm,
pdf_obj * in_res,
fz_matrix transform,
pdf_filter_options * filter,
int struct_parents,
fz_buffer **out_buf,
pdf_obj **out_res)
{
pdf_processor *proc_buffer = NULL;
pdf_processor *proc_filter = NULL;
fz_var(proc_buffer);
fz_var(proc_filter);
*out_buf = NULL;
*out_res = NULL;
fz_try(ctx) {
*out_buf = fz_new_buffer(ctx, 1024);
proc_buffer = pdf_new_buffer_processor(ctx, *out_buf, filter->ascii);
if (filter->sanitize) {
*out_res = pdf_new_dict(ctx, doc, 1);
proc_filter = pdf_new_filter_processor(ctx, doc, proc_buffer, in_res, *out_res, struct_parents, transform, filter);
pdf_process_contents(ctx, proc_filter, doc, in_res, in_stm, NULL);
pdf_close_processor(ctx, proc_filter);
} else {
*out_res = pdf_keep_obj(ctx, in_res);
pdf_process_contents(ctx, proc_buffer, doc, in_res, in_stm, NULL);
}
pdf_close_processor(ctx, proc_buffer);
}
fz_always(ctx) {
pdf_drop_processor(ctx, proc_filter);
pdf_drop_processor(ctx, proc_buffer);
}
fz_catch(ctx) {
fz_drop_buffer(ctx, *out_buf);
*out_buf = NULL;
pdf_drop_obj(ctx, *out_res);
*out_res = NULL;
fz_rethrow(ctx);
}
}
PyObject *
JM_image_reporter(fz_context *ctx, pdf_page *page)
{
pdf_document *doc = page->doc;
pdf_filter_options filter;
memset(&filter, 0, sizeof filter);
filter.opaque = page;
filter.text_filter = NULL;
filter.image_filter = JM_image_filter;
filter.end_page = NULL;
filter.recurse = 0;
filter.instance_forms = 1;
filter.sanitize = 1;
filter.ascii = 1;
pdf_obj *contents, *old_res;
pdf_obj *struct_parents_obj;
pdf_obj *new_res;
fz_buffer *buffer;
int struct_parents;
fz_matrix ctm = fz_identity;
pdf_page_transform(ctx, page, NULL, &ctm);
struct_parents_obj = pdf_dict_get(ctx, page->obj, PDF_NAME(StructParents));
struct_parents = -1;
if (pdf_is_number(ctx, struct_parents_obj))
struct_parents = pdf_to_int(ctx, struct_parents_obj);
contents = pdf_page_contents(ctx, page);
old_res = pdf_page_resources(ctx, page);
img_info = PyList_New(0);
JM_filter_content_stream(ctx, doc, contents, old_res, ctm, &filter, struct_parents, &buffer, &new_res);
fz_drop_buffer(ctx, buffer);
pdf_drop_obj(ctx, new_res);
PyObject *rc = PySequence_Tuple(img_info);
Py_CLEAR(img_info);
return rc;
}
%}
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