SharpMuPDF/mupdf/source/xps/xps-image.c

// Copyright (C) 2004-2025 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 "xps-imp.h"

#include <string.h>

static fz_image *
xps_load_image(fz_context *ctx, xps_document *doc, xps_part *part)
{
	return fz_new_image_from_buffer(ctx, part->data);
}

/* FIXME: area unused! */
static void
xps_paint_image_brush(fz_context *ctx, xps_document *doc, fz_matrix ctm, fz_rect area, char *base_uri, xps_resource *dict,
	fz_xml *root, void *vimage)
{
	fz_image *image = vimage;
	float xs, ys;

	if (image->xres == 0 || image->yres == 0)
		return;
	xs = image->w * 96 / image->xres;
	ys = image->h * 96 / image->yres;
	ctm = fz_pre_scale(ctm, xs, ys);
	fz_fill_image(ctx, doc->dev, image, ctm, doc->opacity[doc->opacity_top], fz_default_color_params);
}

static void
xps_find_image_brush_source_part(fz_context *ctx, xps_document *doc, char *base_uri, fz_xml *root, xps_part **image_part, xps_part **profile_part)
{
	char *image_source_att;
	char buf[1024];
	char partname[1024];
	char *image_name;
	char *profile_name;
	char *p;

	image_source_att = fz_xml_att(root, "ImageSource");
	if (!image_source_att)
		fz_throw(ctx, FZ_ERROR_FORMAT, "cannot find image source attribute");

	/* "{ColorConvertedBitmap /Resources/Image.tiff /Resources/Profile.icc}" */
	if (strstr(image_source_att, "{ColorConvertedBitmap") == image_source_att)
	{
		image_name = NULL;
		profile_name = NULL;

		fz_strlcpy(buf, image_source_att, sizeof buf);
		p = strchr(buf, ' ');
		if (p)
		{
			image_name = p + 1;
			p = strchr(p + 1, ' ');
			if (p)
			{
				*p = 0;
				profile_name = p + 1;
				p = strchr(p + 1, '}');
				if (p)
					*p = 0;
			}
		}
	}
	else
	{
		image_name = image_source_att;
		profile_name = NULL;
	}

	if (!image_name)
		fz_throw(ctx, FZ_ERROR_FORMAT, "cannot find image source");

	if (image_part)
	{
		xps_resolve_url(ctx, doc, partname, base_uri, image_name, sizeof partname);
		*image_part = xps_read_part(ctx, doc, partname);
	}

	if (profile_part)
	{
		if (profile_name)
		{
			xps_resolve_url(ctx, doc, partname, base_uri, profile_name, sizeof partname);
			*profile_part = xps_read_part(ctx, doc, partname);
		}
		else
			*profile_part = NULL;
	}
}

void
xps_parse_image_brush(fz_context *ctx, xps_document *doc, fz_matrix ctm, fz_rect area,
	char *base_uri, xps_resource *dict, fz_xml *root)
{
	xps_part *part = NULL;
	fz_image *image = NULL;

	fz_var(image);

	fz_try(ctx)
	{
		xps_find_image_brush_source_part(ctx, doc, base_uri, root, &part, NULL);
	}
	fz_catch(ctx)
	{
		if (fz_caught(ctx) == FZ_ERROR_TRYLATER)
		{
			if (doc->cookie)
			{
				doc->cookie->incomplete = 1;
				fz_ignore_error(ctx);
			}
			else
				fz_rethrow(ctx);
		}
		else
		{
			fz_rethrow_if(ctx, FZ_ERROR_SYSTEM);
			fz_report_error(ctx);
			fz_warn(ctx, "cannot find image source");
		}
		return;
	}

	fz_try(ctx)
	{
		image = xps_load_image(ctx, doc, part);
		xps_parse_tiling_brush(ctx, doc, ctm, area, base_uri, dict, root, xps_paint_image_brush, image);
	}
	fz_always(ctx)
	{
		xps_drop_part(ctx, doc, part);
		fz_drop_image(ctx, image);
	}
	fz_catch(ctx)
	{
		fz_rethrow_if(ctx, FZ_ERROR_SYSTEM);
		fz_report_error(ctx);
		fz_warn(ctx, "cannot decode image resource");
		return;
	}
}