// Copyright (C) 2004-2024 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_obj *

pdf_xobject_resources(fz_context *ctx, pdf_obj *xobj)

{

  return pdf_dict_get(ctx, xobj, PDF_NAME(Resources));

}

fz_rect

pdf_xobject_bbox(fz_context *ctx, pdf_obj *xobj)

{

  return pdf_dict_get_rect(ctx, xobj, PDF_NAME(BBox));

}

fz_matrix

pdf_xobject_matrix(fz_context *ctx, pdf_obj *xobj)

{

  return pdf_dict_get_matrix(ctx, xobj, PDF_NAME(Matrix));

}

int pdf_xobject_isolated(fz_context *ctx, pdf_obj *xobj)

{

  pdf_obj *group = pdf_dict_get(ctx, xobj, PDF_NAME(Group));

  if (group)

    return pdf_dict_get_bool(ctx, group, PDF_NAME(I));

  return 0;

}

int pdf_xobject_knockout(fz_context *ctx, pdf_obj *xobj)

{

  pdf_obj *group = pdf_dict_get(ctx, xobj, PDF_NAME(Group));

  if (group)

    return pdf_dict_get_bool(ctx, group, PDF_NAME(K));

  return 0;

}

int pdf_xobject_transparency(fz_context *ctx, pdf_obj *xobj)

{

  pdf_obj *group = pdf_dict_get(ctx, xobj, PDF_NAME(Group));

  if (group)

    if (pdf_name_eq(ctx, pdf_dict_get(ctx, group, PDF_NAME(S)), PDF_NAME(Transparency)))

      return 1;

  return 0;

}

fz_colorspace *

pdf_xobject_colorspace(fz_context *ctx, pdf_obj *xobj)

{

  pdf_obj *group = pdf_dict_get(ctx, xobj, PDF_NAME(Group));

  if (group)

  {

    pdf_obj *cs = pdf_dict_get(ctx, group, PDF_NAME(CS));

    if (cs)

    {

      fz_colorspace *colorspace = NULL;

      fz_try(ctx)

        colorspace = pdf_load_colorspace(ctx, cs);

      fz_catch(ctx)

      {

        fz_rethrow_if(ctx, FZ_ERROR_TRYLATER);

        fz_rethrow_if(ctx, FZ_ERROR_SYSTEM);

        fz_report_error(ctx);

        fz_warn(ctx, "Ignoring XObject blending colorspace.");

      }

      if (!fz_is_valid_blend_colorspace(ctx, colorspace))

      {

        fz_warn(ctx, "Ignoring invalid XObject blending colorspace: %s.", fz_colorspace_name(ctx, colorspace));

        fz_drop_colorspace(ctx, colorspace);

        return NULL;

      }

      return colorspace;

    }

  }

  return NULL;

}

pdf_obj *

pdf_new_xobject(fz_context *ctx, pdf_document *doc, fz_rect bbox, fz_matrix matrix, pdf_obj *res, fz_buffer *contents)

{

  pdf_obj *ind = NULL;

  pdf_obj *form = pdf_new_dict(ctx, doc, 5);

  fz_try(ctx)

  {

    pdf_dict_put(ctx, form, PDF_NAME(Type), PDF_NAME(XObject));

    pdf_dict_put(ctx, form, PDF_NAME(Subtype), PDF_NAME(Form));

    pdf_dict_put_rect(ctx, form, PDF_NAME(BBox), bbox);

    pdf_dict_put_matrix(ctx, form, PDF_NAME(Matrix), matrix);

    if (res)

      pdf_dict_put(ctx, form, PDF_NAME(Resources), res);

    ind = pdf_add_stream(ctx, doc, contents, form, 0);

  }

  fz_always(ctx)

    pdf_drop_obj(ctx, form);

  fz_catch(ctx)

    fz_rethrow(ctx);

  return ind;

}

void

pdf_update_xobject(fz_context *ctx, pdf_document *doc, pdf_obj *form, fz_rect bbox, fz_matrix matrix, pdf_obj *res, fz_buffer *contents)

{

  pdf_dict_put_rect(ctx, form, PDF_NAME(BBox), bbox);

  pdf_dict_put_matrix(ctx, form, PDF_NAME(Matrix), matrix);

  if (res)

    pdf_dict_put(ctx, form, PDF_NAME(Resources), res);

  else

    pdf_dict_del(ctx, form, PDF_NAME(Resources));

  pdf_update_stream(ctx, doc, form, contents, 0);

}