SharpMuPDF/mupdf/source/pdf/pdf-pattern.c

// Copyright (C) 2004-2021 Artifex Software, Inc.
//
// This file is part of MuPDF.
//
// MuPDF is free software: you can redistribute it and/or modify it under the
// terms of the GNU Affero General Public License as published by the Free
// Software Foundation, either version 3 of the License, or (at your option)
// any later version.
//
// MuPDF is distributed in the hope that it will be useful, but WITHOUT ANY
// WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
// FOR A PARTICULAR PURPOSE. See the GNU Affero General Public License for more
// details.
//
// You should have received a copy of the GNU Affero General Public License
// along with MuPDF. If not, see <https://www.gnu.org/licenses/agpl-3.0.en.html>
//
// Alternative licensing terms are available from the licensor.
// For commercial licensing, see <https://www.artifex.com/> or contact
// Artifex Software, Inc., 39 Mesa Street, Suite 108A, San Francisco,
// CA 94129, USA, for further information.

#include "mupdf/fitz.h"
#include "mupdf/pdf.h"

pdf_pattern *
pdf_keep_pattern(fz_context *ctx, pdf_pattern *pat)
{
	return fz_keep_storable(ctx, &pat->storable);
}

void
pdf_drop_pattern(fz_context *ctx, pdf_pattern *pat)
{
	fz_drop_storable(ctx, &pat->storable);
}

static void
pdf_drop_pattern_imp(fz_context *ctx, fz_storable *pat_)
{
	pdf_pattern *pat = (pdf_pattern *)pat_;
	pdf_drop_obj(ctx, pat->resources);
	pdf_drop_obj(ctx, pat->contents);
	fz_free(ctx, pat);
}

static unsigned int
pdf_pattern_size(pdf_pattern *pat)
{
	if (pat == NULL)
		return 0;
	return sizeof(*pat);
}

pdf_pattern *
pdf_load_pattern(fz_context *ctx, pdf_document *doc, pdf_obj *dict)
{
	pdf_pattern *pat;

	if ((pat = pdf_find_item(ctx, pdf_drop_pattern_imp, dict)) != NULL)
	{
		return pat;
	}

	pat = fz_malloc_struct(ctx, pdf_pattern);
	FZ_INIT_STORABLE(pat, 1, pdf_drop_pattern_imp);
	pat->document = doc;
	pat->resources = NULL;
	pat->contents = NULL;
	pat->id = pdf_to_num(ctx, dict);

	fz_try(ctx)
	{
		/* Store pattern now, to avoid possible recursion if objects refer back to this one */
		pdf_store_item(ctx, dict, pat, pdf_pattern_size(pat));

		pat->ismask = pdf_dict_get_int(ctx, dict, PDF_NAME(PaintType)) == 2;
		pat->xstep = pdf_dict_get_real(ctx, dict, PDF_NAME(XStep));
		pat->ystep = pdf_dict_get_real(ctx, dict, PDF_NAME(YStep));
		pat->bbox = pdf_dict_get_rect(ctx, dict, PDF_NAME(BBox));
		pat->matrix = pdf_dict_get_matrix(ctx, dict, PDF_NAME(Matrix));

		pat->resources = pdf_dict_get(ctx, dict, PDF_NAME(Resources));
		if (pat->resources)
			pdf_keep_obj(ctx, pat->resources);

		pat->contents = pdf_keep_obj(ctx, dict);
	}
	fz_catch(ctx)
	{
		pdf_remove_item(ctx, pdf_drop_pattern_imp, dict);
		pdf_drop_pattern(ctx, pat);
		fz_rethrow(ctx);
	}
	return pat;
}