Blame pngwrite.c

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/* pngwrite.c - general routines to write a PNG file
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 *
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 * Last changed in libpng 1.2.54 [November 12, 2015]
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 * Copyright (c) 1998-2002,2004,2006-2015 Glenn Randers-Pehrson
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 * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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 * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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 *
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 * This code is released under the libpng license.
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 * For conditions of distribution and use, see the disclaimer
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 * and license in png.h
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 */
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/* Get internal access to png.h */
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#define PNG_INTERNAL
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#define PNG_NO_PEDANTIC_WARNINGS
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#include "png.h"
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#ifdef PNG_WRITE_SUPPORTED
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/* Writes all the PNG information.  This is the suggested way to use the
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 * library.  If you have a new chunk to add, make a function to write it,
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 * and put it in the correct location here.  If you want the chunk written
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 * after the image data, put it in png_write_end().  I strongly encourage
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 * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
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 * the chunk, as that will keep the code from breaking if you want to just
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 * write a plain PNG file.  If you have long comments, I suggest writing
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 * them in png_write_end(), and compressing them.
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 */
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void PNGAPI
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png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
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{
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   png_debug(1, "in png_write_info_before_PLTE");
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   if (png_ptr == NULL || info_ptr == NULL)
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      return;
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   if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
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   {
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   /* Write PNG signature */
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   png_write_sig(png_ptr);
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#ifdef PNG_MNG_FEATURES_SUPPORTED
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   if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \
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      (png_ptr->mng_features_permitted))
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   {
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      png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
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      png_ptr->mng_features_permitted = 0;
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   }
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#endif
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   /* Write IHDR information. */
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   png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
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      info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
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      info_ptr->filter_type,
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#ifdef PNG_WRITE_INTERLACING_SUPPORTED
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      info_ptr->interlace_type);
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#else
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      0);
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#endif
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   /* The rest of these check to see if the valid field has the appropriate
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    * flag set, and if it does, writes the chunk.
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    */
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#ifdef PNG_WRITE_gAMA_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_gAMA)
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   {
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#  ifdef PNG_FLOATING_POINT_SUPPORTED
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      png_write_gAMA(png_ptr, info_ptr->gamma);
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#else
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#ifdef PNG_FIXED_POINT_SUPPORTED
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      png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
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#  endif
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#endif
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   }
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#endif
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#ifdef PNG_WRITE_sRGB_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_sRGB)
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      png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
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#endif
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#ifdef PNG_WRITE_iCCP_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_iCCP)
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      png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
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                     info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
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#endif
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#ifdef PNG_WRITE_sBIT_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_sBIT)
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      png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
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#endif
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#ifdef PNG_WRITE_cHRM_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_cHRM)
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   {
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#ifdef PNG_FLOATING_POINT_SUPPORTED
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      png_write_cHRM(png_ptr,
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         info_ptr->x_white, info_ptr->y_white,
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         info_ptr->x_red, info_ptr->y_red,
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         info_ptr->x_green, info_ptr->y_green,
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         info_ptr->x_blue, info_ptr->y_blue);
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#else
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#  ifdef PNG_FIXED_POINT_SUPPORTED
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      png_write_cHRM_fixed(png_ptr,
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         info_ptr->int_x_white, info_ptr->int_y_white,
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         info_ptr->int_x_red, info_ptr->int_y_red,
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         info_ptr->int_x_green, info_ptr->int_y_green,
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         info_ptr->int_x_blue, info_ptr->int_y_blue);
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#  endif
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#endif
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   }
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#endif
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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   if (info_ptr->unknown_chunks_num)
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   {
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      png_unknown_chunk *up;
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      png_debug(5, "writing extra chunks");
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      for (up = info_ptr->unknown_chunks;
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           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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           up++)
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      {
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         int keep = png_handle_as_unknown(png_ptr, up->name);
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         if (keep != PNG_HANDLE_CHUNK_NEVER &&
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            up->location && !(up->location & PNG_HAVE_PLTE) &&
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            !(up->location & PNG_HAVE_IDAT) &&
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            ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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         {
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            if (up->size == 0)
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               png_warning(png_ptr, "Writing zero-length unknown chunk");
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            png_write_chunk(png_ptr, up->name, up->data, up->size);
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         }
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      }
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   }
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#endif
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      png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
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   }
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}
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void PNGAPI
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png_write_info(png_structp png_ptr, png_infop info_ptr)
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{
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#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
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   int i;
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#endif
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   png_debug(1, "in png_write_info");
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   if (png_ptr == NULL || info_ptr == NULL)
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      return;
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   png_write_info_before_PLTE(png_ptr, info_ptr);
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   if (info_ptr->valid & PNG_INFO_PLTE)
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      png_write_PLTE(png_ptr, info_ptr->palette,
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         (png_uint_32)info_ptr->num_palette);
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   else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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      png_error(png_ptr, "Valid palette required for paletted images");
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#ifdef PNG_WRITE_tRNS_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_tRNS)
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   {
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#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
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      /* Invert the alpha channel (in tRNS) */
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      if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
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         info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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      {
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         int j;
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         for (j = 0; j<(int)info_ptr->num_trans; j++)
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            info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
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      }
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#endif
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      png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
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         info_ptr->num_trans, info_ptr->color_type);
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   }
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#endif
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#ifdef PNG_WRITE_bKGD_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_bKGD)
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      png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
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#endif
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#ifdef PNG_WRITE_hIST_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_hIST)
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      png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
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#endif
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#ifdef PNG_WRITE_oFFs_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_oFFs)
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      png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
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         info_ptr->offset_unit_type);
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#endif
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#ifdef PNG_WRITE_pCAL_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_pCAL)
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      png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
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         info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
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         info_ptr->pcal_units, info_ptr->pcal_params);
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#endif
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#ifdef PNG_sCAL_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_sCAL)
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#ifdef PNG_WRITE_sCAL_SUPPORTED
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#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
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      png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
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          info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
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#else /* !FLOATING_POINT */
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#ifdef PNG_FIXED_POINT_SUPPORTED
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      png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
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          info_ptr->scal_s_width, info_ptr->scal_s_height);
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#endif /* FIXED_POINT */
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#endif /* FLOATING_POINT */
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#else  /* !WRITE_sCAL */
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      png_warning(png_ptr,
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          "png_write_sCAL not supported; sCAL chunk not written.");
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#endif /* WRITE_sCAL */
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#endif /* sCAL */
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#ifdef PNG_WRITE_pHYs_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_pHYs)
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      png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
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         info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
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#endif /* pHYs */
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#ifdef PNG_WRITE_tIME_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_tIME)
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   {
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      png_write_tIME(png_ptr, &(info_ptr->mod_time));
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      png_ptr->mode |= PNG_WROTE_tIME;
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   }
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#endif /* tIME */
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#ifdef PNG_WRITE_sPLT_SUPPORTED
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   if (info_ptr->valid & PNG_INFO_sPLT)
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     for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
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       png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
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#endif /* sPLT */
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#ifdef PNG_WRITE_TEXT_SUPPORTED
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   /* Check to see if we need to write text chunks */
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   for (i = 0; i < info_ptr->num_text; i++)
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   {
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      png_debug2(2, "Writing header text chunk %d, type %d", i,
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         info_ptr->text[i].compression);
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      /* An internationalized chunk? */
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      if (info_ptr->text[i].compression > 0)
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      {
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#ifdef PNG_WRITE_iTXt_SUPPORTED
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          /* Write international chunk */
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          png_write_iTXt(png_ptr,
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                         info_ptr->text[i].compression,
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                         info_ptr->text[i].key,
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                         info_ptr->text[i].lang,
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                         info_ptr->text[i].lang_key,
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                         info_ptr->text[i].text);
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#else
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          png_warning(png_ptr, "Unable to write international text");
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#endif
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          /* Mark this chunk as written */
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          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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      }
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      /* If we want a compressed text chunk */
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      else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
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      {
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#ifdef PNG_WRITE_zTXt_SUPPORTED
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         /* Write compressed chunk */
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         png_write_zTXt(png_ptr, info_ptr->text[i].key,
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            info_ptr->text[i].text, 0,
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            info_ptr->text[i].compression);
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#else
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         png_warning(png_ptr, "Unable to write compressed text");
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#endif
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         /* Mark this chunk as written */
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         info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
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      }
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      else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
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      {
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#ifdef PNG_WRITE_tEXt_SUPPORTED
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         /* Write uncompressed chunk */
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         png_write_tEXt(png_ptr, info_ptr->text[i].key,
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                         info_ptr->text[i].text,
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                         0);
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         /* Mark this chunk as written */
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         info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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#else
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         /* Can't get here */
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         png_warning(png_ptr, "Unable to write uncompressed text");
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#endif
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      }
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   }
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#endif /* tEXt */
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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   if (info_ptr->unknown_chunks_num)
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   {
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      png_unknown_chunk *up;
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      png_debug(5, "writing extra chunks");
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      for (up = info_ptr->unknown_chunks;
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           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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           up++)
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      {
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         int keep = png_handle_as_unknown(png_ptr, up->name);
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         if (keep != PNG_HANDLE_CHUNK_NEVER &&
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            up->location && (up->location & PNG_HAVE_PLTE) &&
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            !(up->location & PNG_HAVE_IDAT) &&
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            !(up->location & PNG_AFTER_IDAT) &&
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            ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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         {
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            png_write_chunk(png_ptr, up->name, up->data, up->size);
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         }
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      }
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   }
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#endif
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}
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/* Writes the end of the PNG file.  If you don't want to write comments or
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 * time information, you can pass NULL for info.  If you already wrote these
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 * in png_write_info(), do not write them again here.  If you have long
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 * comments, I suggest writing them here, and compressing them.
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 */
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void PNGAPI
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png_write_end(png_structp png_ptr, png_infop info_ptr)
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{
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   png_debug(1, "in png_write_end");
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   if (png_ptr == NULL)
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      return;
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   if (!(png_ptr->mode & PNG_HAVE_IDAT))
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      png_error(png_ptr, "No IDATs written into file");
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   /* See if user wants us to write information chunks */
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   if (info_ptr != NULL)
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   {
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#ifdef PNG_WRITE_TEXT_SUPPORTED
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      int i; /* local index variable */
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#endif
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#ifdef PNG_WRITE_tIME_SUPPORTED
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      /* Check to see if user has supplied a time chunk */
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      if ((info_ptr->valid & PNG_INFO_tIME) &&
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         !(png_ptr->mode & PNG_WROTE_tIME))
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         png_write_tIME(png_ptr, &(info_ptr->mod_time));
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#endif
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#ifdef PNG_WRITE_TEXT_SUPPORTED
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      /* Loop through comment chunks */
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      for (i = 0; i < info_ptr->num_text; i++)
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      {
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         png_debug2(2, "Writing trailer text chunk %d, type %d", i,
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            info_ptr->text[i].compression);
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         /* An internationalized chunk? */
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         if (info_ptr->text[i].compression > 0)
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         {
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#ifdef PNG_WRITE_iTXt_SUPPORTED
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            /* Write international chunk */
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            png_write_iTXt(png_ptr,
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                        info_ptr->text[i].compression,
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                        info_ptr->text[i].key,
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                        info_ptr->text[i].lang,
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                        info_ptr->text[i].lang_key,
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                        info_ptr->text[i].text);
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#else
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            png_warning(png_ptr, "Unable to write international text");
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#endif
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            /* Mark this chunk as written */
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            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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         }
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         else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
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         {
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#ifdef PNG_WRITE_zTXt_SUPPORTED
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            /* Write compressed chunk */
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            png_write_zTXt(png_ptr, info_ptr->text[i].key,
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               info_ptr->text[i].text, 0,
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               info_ptr->text[i].compression);
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#else
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            png_warning(png_ptr, "Unable to write compressed text");
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#endif
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            /* Mark this chunk as written */
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            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
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         }
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         else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
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         {
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#ifdef PNG_WRITE_tEXt_SUPPORTED
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            /* Write uncompressed chunk */
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            png_write_tEXt(png_ptr, info_ptr->text[i].key,
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               info_ptr->text[i].text, 0);
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#else
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            png_warning(png_ptr, "Unable to write uncompressed text");
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#endif
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            /* Mark this chunk as written */
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            info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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         }
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      }
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#endif
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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   if (info_ptr->unknown_chunks_num)
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   {
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      png_unknown_chunk *up;
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      png_debug(5, "writing extra chunks");
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      for (up = info_ptr->unknown_chunks;
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           up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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           up++)
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      {
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         int keep = png_handle_as_unknown(png_ptr, up->name);
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         if (keep != PNG_HANDLE_CHUNK_NEVER &&
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            up->location && (up->location & PNG_AFTER_IDAT) &&
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            ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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            (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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         {
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            png_write_chunk(png_ptr, up->name, up->data, up->size);
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         }
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      }
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   }
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#endif
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   }
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   png_ptr->mode |= PNG_AFTER_IDAT;
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   /* Write end of PNG file */
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   png_write_IEND(png_ptr);
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   /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
Packit 0ba690
    * and restored again in libpng-1.2.30, may cause some applications that
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    * do not set png_ptr->output_flush_fn to crash.  If your application
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    * experiences a problem, please try building libpng with
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    * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
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    * png-mng-implement at lists.sf.net .
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    */
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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#  ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
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   png_flush(png_ptr);
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#  endif
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#endif
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}
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#ifdef PNG_CONVERT_tIME_SUPPORTED
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/* "tm" structure is not supported on WindowsCE */
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void PNGAPI
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png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
Packit 0ba690
{
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   png_debug(1, "in png_convert_from_struct_tm");
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   ptime->year = (png_uint_16)(1900 + ttime->tm_year);
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   ptime->month = (png_byte)(ttime->tm_mon + 1);
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   ptime->day = (png_byte)ttime->tm_mday;
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   ptime->hour = (png_byte)ttime->tm_hour;
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   ptime->minute = (png_byte)ttime->tm_min;
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   ptime->second = (png_byte)ttime->tm_sec;
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}
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void PNGAPI
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png_convert_from_time_t(png_timep ptime, time_t ttime)
Packit 0ba690
{
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   struct tm *tbuf;
Packit 0ba690
Packit 0ba690
   png_debug(1, "in png_convert_from_time_t");
Packit 0ba690
Packit 0ba690
   tbuf = gmtime(&ttime);
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   png_convert_from_struct_tm(ptime, tbuf);
Packit 0ba690
}
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#endif
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/* Initialize png_ptr structure, and allocate any memory needed */
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png_structp PNGAPI
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png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
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   png_error_ptr error_fn, png_error_ptr warn_fn)
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{
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#ifdef PNG_USER_MEM_SUPPORTED
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   return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
Packit 0ba690
      warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
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}
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Packit 0ba690
/* Alternate initialize png_ptr structure, and allocate any memory needed */
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png_structp PNGAPI
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png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
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   png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
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   png_malloc_ptr malloc_fn, png_free_ptr free_fn)
Packit 0ba690
{
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#endif /* PNG_USER_MEM_SUPPORTED */
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#ifdef PNG_SETJMP_SUPPORTED
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   volatile
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#endif
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   png_structp png_ptr;
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#ifdef PNG_SETJMP_SUPPORTED
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#ifdef USE_FAR_KEYWORD
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   jmp_buf jmpbuf;
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#endif
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#endif
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   int i;
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   png_debug(1, "in png_create_write_struct");
Packit 0ba690
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#ifdef PNG_USER_MEM_SUPPORTED
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   png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
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      (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
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#else
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   png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
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#endif /* PNG_USER_MEM_SUPPORTED */
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   if (png_ptr == NULL)
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      return (NULL);
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Packit 0ba690
   /* Added at libpng-1.2.6 */
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#ifdef PNG_SET_USER_LIMITS_SUPPORTED
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   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
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   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
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#endif
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#ifdef PNG_SETJMP_SUPPORTED
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#ifdef USE_FAR_KEYWORD
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   if (setjmp(jmpbuf))
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#else
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   if (setjmp(png_ptr->jmpbuf))
Packit 0ba690
#endif
Packit 0ba690
   {
Packit 0ba690
      png_free(png_ptr, png_ptr->zbuf);
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      png_ptr->zbuf = NULL;
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#ifdef PNG_USER_MEM_SUPPORTED
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      png_destroy_struct_2((png_voidp)png_ptr,
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         (png_free_ptr)free_fn, (png_voidp)mem_ptr);
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#else
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      png_destroy_struct((png_voidp)png_ptr);
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#endif
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      return (NULL);
Packit 0ba690
   }
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#ifdef USE_FAR_KEYWORD
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   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
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#endif
Packit 0ba690
#endif
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Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
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   png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
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#endif /* PNG_USER_MEM_SUPPORTED */
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   png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
Packit 0ba690
Packit 0ba690
   if (user_png_ver != NULL)
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   {
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      int found_dots = 0;
Packit 0ba690
      i = -1;
Packit 0ba690
Packit 0ba690
      do
Packit 0ba690
      {
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         i++;
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         if (user_png_ver[i] != PNG_LIBPNG_VER_STRING[i])
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            png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
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         if (user_png_ver[i] == '.')
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            found_dots++;
Packit 0ba690
      } while (found_dots < 2 && user_png_ver[i] != 0 &&
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            PNG_LIBPNG_VER_STRING[i] != 0);
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   }
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   else
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      png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
Packit 0ba690
Packit 0ba690
   if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
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   {
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     /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
Packit 0ba690
      * we must recompile any applications that use any older library version.
Packit 0ba690
      * For versions after libpng 1.0, we will be compatible, so we need
Packit 0ba690
      * only check the first digit.
Packit 0ba690
      */
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     if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
Packit 0ba690
         (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
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         (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
Packit 0ba690
     {
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#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
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        char msg[80];
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        if (user_png_ver)
Packit 0ba690
        {
Packit 0ba690
           png_snprintf(msg, 80,
Packit 0ba690
              "Application was compiled with png.h from libpng-%.20s",
Packit 0ba690
              user_png_ver);
Packit 0ba690
           png_warning(png_ptr, msg);
Packit 0ba690
        }
Packit 0ba690
        png_snprintf(msg, 80,
Packit 0ba690
           "Application  is  running with png.c from libpng-%.20s",
Packit 0ba690
           png_libpng_ver);
Packit 0ba690
        png_warning(png_ptr, msg);
Packit 0ba690
#endif
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#ifdef PNG_ERROR_NUMBERS_SUPPORTED
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        png_ptr->flags = 0;
Packit 0ba690
#endif
Packit 0ba690
        png_error(png_ptr,
Packit 0ba690
           "Incompatible libpng version in application and library");
Packit 0ba690
     }
Packit 0ba690
   }
Packit 0ba690
Packit 0ba690
   /* Initialize zbuf - compression buffer */
Packit 0ba690
   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
Packit 0ba690
   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
Packit 0ba690
     (png_uint_32)png_ptr->zbuf_size);
Packit 0ba690
Packit 0ba690
   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
Packit 0ba690
      png_flush_ptr_NULL);
Packit 0ba690
Packit 0ba690
#ifdef PNG_SETJMP_SUPPORTED
Packit 0ba690
   /* Applications that neglect to set up their own setjmp() and then
Packit 0ba690
    * encounter a png_error() will longjmp here.  Since the jmpbuf is
Packit 0ba690
    * then meaningless we abort instead of returning.
Packit 0ba690
    */
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#ifdef USE_FAR_KEYWORD
Packit 0ba690
   if (setjmp(jmpbuf))
Packit 0ba690
      PNG_ABORT();
Packit 0ba690
   png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
Packit 0ba690
#else
Packit 0ba690
   if (setjmp(png_ptr->jmpbuf))
Packit 0ba690
      PNG_ABORT();
Packit 0ba690
#endif
Packit 0ba690
#endif
Packit 0ba690
   return (png_ptr);
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
/* Initialize png_ptr structure, and allocate any memory needed */
Packit 0ba690
#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
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/* Deprecated. */
Packit 0ba690
#undef png_write_init
Packit 0ba690
void PNGAPI
Packit 0ba690
png_write_init(png_structp png_ptr)
Packit 0ba690
{
Packit 0ba690
   /* We only come here via pre-1.0.7-compiled applications */
Packit 0ba690
   png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
void PNGAPI
Packit 0ba690
png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
Packit 0ba690
   png_size_t png_struct_size, png_size_t png_info_size)
Packit 0ba690
{
Packit 0ba690
   /* We only come here via pre-1.0.12-compiled applications */
Packit 0ba690
   if (png_ptr == NULL) return;
Packit 0ba690
#if defined(PNG_STDIO_SUPPORTED) && !defined(_WIN32_WCE)
Packit 0ba690
   if (png_sizeof(png_struct) > png_struct_size ||
Packit 0ba690
      png_sizeof(png_info) > png_info_size)
Packit 0ba690
   {
Packit 0ba690
      char msg[80];
Packit 0ba690
      png_ptr->warning_fn = NULL;
Packit 0ba690
      if (user_png_ver)
Packit 0ba690
      {
Packit 0ba690
         png_snprintf(msg, 80,
Packit 0ba690
            "Application was compiled with png.h from libpng-%.20s",
Packit 0ba690
            user_png_ver);
Packit 0ba690
         png_warning(png_ptr, msg);
Packit 0ba690
      }
Packit 0ba690
      png_snprintf(msg, 80,
Packit 0ba690
         "Application  is  running with png.c from libpng-%.20s",
Packit 0ba690
         png_libpng_ver);
Packit 0ba690
      png_warning(png_ptr, msg);
Packit 0ba690
   }
Packit 0ba690
#endif
Packit 0ba690
   if (png_sizeof(png_struct) > png_struct_size)
Packit 0ba690
   {
Packit 0ba690
      png_ptr->error_fn = NULL;
Packit 0ba690
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
Packit 0ba690
      png_ptr->flags = 0;
Packit 0ba690
#endif
Packit 0ba690
      png_error(png_ptr,
Packit 0ba690
      "The png struct allocated by the application for writing is"
Packit 0ba690
      " too small.");
Packit 0ba690
   }
Packit 0ba690
   if (png_sizeof(png_info) > png_info_size)
Packit 0ba690
   {
Packit 0ba690
      png_ptr->error_fn = NULL;
Packit 0ba690
#ifdef PNG_ERROR_NUMBERS_SUPPORTED
Packit 0ba690
      png_ptr->flags = 0;
Packit 0ba690
#endif
Packit 0ba690
      png_error(png_ptr,
Packit 0ba690
      "The info struct allocated by the application for writing is"
Packit 0ba690
      " too small.");
Packit 0ba690
   }
Packit 0ba690
   png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
Packit 0ba690
}
Packit 0ba690
#endif /* PNG_1_0_X || PNG_1_2_X */
Packit 0ba690
Packit 0ba690
Packit 0ba690
void PNGAPI
Packit 0ba690
png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
Packit 0ba690
   png_size_t png_struct_size)
Packit 0ba690
{
Packit 0ba690
   png_structp png_ptr = *ptr_ptr;
Packit 0ba690
#ifdef PNG_SETJMP_SUPPORTED
Packit 0ba690
   jmp_buf tmp_jmp; /* to save current jump buffer */
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   int i = 0;
Packit 0ba690
Packit 0ba690
   if (png_ptr == NULL)
Packit 0ba690
      return;
Packit 0ba690
Packit 0ba690
   do
Packit 0ba690
   {
Packit 0ba690
      if (user_png_ver[i] != png_libpng_ver[i])
Packit 0ba690
      {
Packit 0ba690
#ifdef PNG_LEGACY_SUPPORTED
Packit 0ba690
         png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
Packit 0ba690
#else
Packit 0ba690
         png_ptr->warning_fn = NULL;
Packit 0ba690
         png_warning(png_ptr,
Packit 0ba690
 "Application uses deprecated png_write_init() and should be recompiled.");
Packit 0ba690
#endif
Packit 0ba690
   }
Packit 0ba690
      i++;
Packit 0ba690
   } while (png_libpng_ver[i] != 0 && user_png_ver[i] != 0);
Packit 0ba690
Packit 0ba690
   png_debug(1, "in png_write_init_3");
Packit 0ba690
Packit 0ba690
#ifdef PNG_SETJMP_SUPPORTED
Packit 0ba690
   /* Save jump buffer and error functions */
Packit 0ba690
   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   if (png_sizeof(png_struct) > png_struct_size)
Packit 0ba690
   {
Packit 0ba690
      png_destroy_struct(png_ptr);
Packit 0ba690
      png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
Packit 0ba690
      *ptr_ptr = png_ptr;
Packit 0ba690
   }
Packit 0ba690
Packit 0ba690
   /* Reset all variables to 0 */
Packit 0ba690
   png_memset(png_ptr, 0, png_sizeof(png_struct));
Packit 0ba690
Packit 0ba690
   /* Added at libpng-1.2.6 */
Packit 0ba690
#ifdef PNG_SET_USER_LIMITS_SUPPORTED
Packit 0ba690
   png_ptr->user_width_max = PNG_USER_WIDTH_MAX;
Packit 0ba690
   png_ptr->user_height_max = PNG_USER_HEIGHT_MAX;
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
#ifdef PNG_SETJMP_SUPPORTED
Packit 0ba690
   /* Restore jump buffer */
Packit 0ba690
   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
Packit 0ba690
      png_flush_ptr_NULL);
Packit 0ba690
Packit 0ba690
   /* Initialize zbuf - compression buffer */
Packit 0ba690
   png_ptr->zbuf_size = PNG_ZBUF_SIZE;
Packit 0ba690
   png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
Packit 0ba690
     (png_uint_32)png_ptr->zbuf_size);
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
/* Write a few rows of image data.  If the image is interlaced,
Packit 0ba690
 * either you will have to write the 7 sub images, or, if you
Packit 0ba690
 * have called png_set_interlace_handling(), you will have to
Packit 0ba690
 * "write" the image seven times.
Packit 0ba690
 */
Packit 0ba690
void PNGAPI
Packit 0ba690
png_write_rows(png_structp png_ptr, png_bytepp row,
Packit 0ba690
   png_uint_32 num_rows)
Packit 0ba690
{
Packit 0ba690
   png_uint_32 i; /* row counter */
Packit 0ba690
   png_bytepp rp; /* row pointer */
Packit 0ba690
Packit 0ba690
   png_debug(1, "in png_write_rows");
Packit 0ba690
Packit 0ba690
   if (png_ptr == NULL)
Packit 0ba690
      return;
Packit 0ba690
Packit 0ba690
   /* Loop through the rows */
Packit 0ba690
   for (i = 0, rp = row; i < num_rows; i++, rp++)
Packit 0ba690
   {
Packit 0ba690
      png_write_row(png_ptr, *rp);
Packit 0ba690
   }
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
/* Write the image.  You only need to call this function once, even
Packit 0ba690
 * if you are writing an interlaced image.
Packit 0ba690
 */
Packit 0ba690
void PNGAPI
Packit 0ba690
png_write_image(png_structp png_ptr, png_bytepp image)
Packit 0ba690
{
Packit 0ba690
   png_uint_32 i; /* row index */
Packit 0ba690
   int pass, num_pass; /* pass variables */
Packit 0ba690
   png_bytepp rp; /* points to current row */
Packit 0ba690
Packit 0ba690
   if (png_ptr == NULL)
Packit 0ba690
      return;
Packit 0ba690
Packit 0ba690
   png_debug(1, "in png_write_image");
Packit 0ba690
Packit 0ba690
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
Packit 0ba690
   /* Initialize interlace handling.  If image is not interlaced,
Packit 0ba690
    * this will set pass to 1
Packit 0ba690
    */
Packit 0ba690
   num_pass = png_set_interlace_handling(png_ptr);
Packit 0ba690
#else
Packit 0ba690
   num_pass = 1;
Packit 0ba690
#endif
Packit 0ba690
   /* Loop through passes */
Packit 0ba690
   for (pass = 0; pass < num_pass; pass++)
Packit 0ba690
   {
Packit 0ba690
      /* Loop through image */
Packit 0ba690
      for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
Packit 0ba690
      {
Packit 0ba690
         png_write_row(png_ptr, *rp);
Packit 0ba690
      }
Packit 0ba690
   }
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
/* Called by user to write a row of image data */
Packit 0ba690
void PNGAPI
Packit 0ba690
png_write_row(png_structp png_ptr, png_bytep row)
Packit 0ba690
{
Packit 0ba690
   if (png_ptr == NULL)
Packit 0ba690
      return;
Packit 0ba690
Packit 0ba690
   png_debug2(1, "in png_write_row (row %ld, pass %d)",
Packit 0ba690
      png_ptr->row_number, png_ptr->pass);
Packit 0ba690
Packit 0ba690
   /* Initialize transformations and other stuff if first time */
Packit 0ba690
   if (png_ptr->row_number == 0 && png_ptr->pass == 0)
Packit 0ba690
   {
Packit 0ba690
      /* Make sure we wrote the header info */
Packit 0ba690
      if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
Packit 0ba690
         png_error(png_ptr,
Packit 0ba690
            "png_write_info was never called before png_write_row.");
Packit 0ba690
Packit 0ba690
      /* Check for transforms that have been set but were defined out */
Packit 0ba690
#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
Packit 0ba690
      if (png_ptr->transformations & PNG_INVERT_MONO)
Packit 0ba690
         png_warning(png_ptr,
Packit 0ba690
             "PNG_WRITE_INVERT_SUPPORTED is not defined.");
Packit 0ba690
#endif
Packit 0ba690
#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
Packit 0ba690
      if (png_ptr->transformations & PNG_FILLER)
Packit 0ba690
         png_warning(png_ptr,
Packit 0ba690
             "PNG_WRITE_FILLER_SUPPORTED is not defined.");
Packit 0ba690
#endif
Packit 0ba690
#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && \
Packit 0ba690
    defined(PNG_READ_PACKSWAP_SUPPORTED)
Packit 0ba690
      if (png_ptr->transformations & PNG_PACKSWAP)
Packit 0ba690
         png_warning(png_ptr,
Packit 0ba690
             "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
Packit 0ba690
#endif
Packit 0ba690
#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
Packit 0ba690
      if (png_ptr->transformations & PNG_PACK)
Packit 0ba690
         png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
Packit 0ba690
#endif
Packit 0ba690
#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
Packit 0ba690
      if (png_ptr->transformations & PNG_SHIFT)
Packit 0ba690
         png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
Packit 0ba690
#endif
Packit 0ba690
#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
Packit 0ba690
      if (png_ptr->transformations & PNG_BGR)
Packit 0ba690
         png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
Packit 0ba690
#endif
Packit 0ba690
#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
Packit 0ba690
      if (png_ptr->transformations & PNG_SWAP_BYTES)
Packit 0ba690
         png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
      png_write_start_row(png_ptr);
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   }
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#ifdef PNG_WRITE_INTERLACING_SUPPORTED
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   /* If interlaced and not interested in row, return */
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   if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
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   {
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      switch (png_ptr->pass)
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      {
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         case 0:
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            if (png_ptr->row_number & 0x07)
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            {
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               png_write_finish_row(png_ptr);
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               return;
Packit 0ba690
            }
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            break;
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         case 1:
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            if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
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            {
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               png_write_finish_row(png_ptr);
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               return;
Packit 0ba690
            }
Packit 0ba690
            break;
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         case 2:
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            if ((png_ptr->row_number & 0x07) != 4)
Packit 0ba690
            {
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               png_write_finish_row(png_ptr);
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               return;
Packit 0ba690
            }
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            break;
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         case 3:
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            if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
Packit 0ba690
            {
Packit 0ba690
               png_write_finish_row(png_ptr);
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               return;
Packit 0ba690
            }
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            break;
Packit 0ba690
         case 4:
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            if ((png_ptr->row_number & 0x03) != 2)
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            {
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               png_write_finish_row(png_ptr);
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               return;
Packit 0ba690
            }
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            break;
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         case 5:
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            if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
Packit 0ba690
            {
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               png_write_finish_row(png_ptr);
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               return;
Packit 0ba690
            }
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            break;
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         case 6:
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            if (!(png_ptr->row_number & 0x01))
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            {
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               png_write_finish_row(png_ptr);
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               return;
Packit 0ba690
            }
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            break;
Packit 0ba690
      }
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   }
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#endif
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   /* Set up row info for transformations */
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   png_ptr->row_info.color_type = png_ptr->color_type;
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   png_ptr->row_info.width = png_ptr->usr_width;
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   png_ptr->row_info.channels = png_ptr->usr_channels;
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   png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
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   png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
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      png_ptr->row_info.channels);
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   png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
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      png_ptr->row_info.width);
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   png_debug1(3, "row_info->color_type = %d", png_ptr->row_info.color_type);
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   png_debug1(3, "row_info->width = %lu", png_ptr->row_info.width);
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   png_debug1(3, "row_info->channels = %d", png_ptr->row_info.channels);
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   png_debug1(3, "row_info->bit_depth = %d", png_ptr->row_info.bit_depth);
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   png_debug1(3, "row_info->pixel_depth = %d", png_ptr->row_info.pixel_depth);
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   png_debug1(3, "row_info->rowbytes = %lu", png_ptr->row_info.rowbytes);
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   /* Copy user's row into buffer, leaving room for filter byte. */
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   png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
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      png_ptr->row_info.rowbytes);
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#ifdef PNG_WRITE_INTERLACING_SUPPORTED
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   /* Handle interlacing */
Packit 0ba690
   if (png_ptr->interlaced && png_ptr->pass < 6 &&
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      (png_ptr->transformations & PNG_INTERLACE))
Packit 0ba690
   {
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      png_do_write_interlace(&(png_ptr->row_info),
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         png_ptr->row_buf + 1, png_ptr->pass);
Packit 0ba690
      /* This should always get caught above, but still ... */
Packit 0ba690
      if (!(png_ptr->row_info.width))
Packit 0ba690
      {
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         png_write_finish_row(png_ptr);
Packit 0ba690
         return;
Packit 0ba690
      }
Packit 0ba690
   }
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#endif
Packit 0ba690
Packit 0ba690
   /* Handle other transformations */
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   if (png_ptr->transformations)
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      png_do_write_transformations(png_ptr);
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#ifdef PNG_MNG_FEATURES_SUPPORTED
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   /* Write filter_method 64 (intrapixel differencing) only if
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    * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
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    * 2. Libpng did not write a PNG signature (this filter_method is only
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    *    used in PNG datastreams that are embedded in MNG datastreams) and
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    * 3. The application called png_permit_mng_features with a mask that
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    *    included PNG_FLAG_MNG_FILTER_64 and
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    * 4. The filter_method is 64 and
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    * 5. The color_type is RGB or RGBA
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    */
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   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
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      (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
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   {
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      /* Intrapixel differencing */
Packit 0ba690
      png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
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   }
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#endif
Packit 0ba690
Packit 0ba690
   /* Find a filter if necessary, filter the row and write it out. */
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   png_write_find_filter(png_ptr, &(png_ptr->row_info));
Packit 0ba690
Packit 0ba690
   if (png_ptr->write_row_fn != NULL)
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      (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
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}
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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/* Set the automatic flush interval or 0 to turn flushing off */
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void PNGAPI
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png_set_flush(png_structp png_ptr, int nrows)
Packit 0ba690
{
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   png_debug(1, "in png_set_flush");
Packit 0ba690
Packit 0ba690
   if (png_ptr == NULL)
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      return;
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   png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
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}
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Packit 0ba690
/* Flush the current output buffers now */
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void PNGAPI
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png_write_flush(png_structp png_ptr)
Packit 0ba690
{
Packit 0ba690
   int wrote_IDAT;
Packit 0ba690
Packit 0ba690
   png_debug(1, "in png_write_flush");
Packit 0ba690
Packit 0ba690
   if (png_ptr == NULL)
Packit 0ba690
      return;
Packit 0ba690
   /* We have already written out all of the data */
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   if (png_ptr->row_number >= png_ptr->num_rows)
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      return;
Packit 0ba690
Packit 0ba690
   do
Packit 0ba690
   {
Packit 0ba690
      int ret;
Packit 0ba690
Packit 0ba690
      /* Compress the data */
Packit 0ba690
      ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
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      wrote_IDAT = 0;
Packit 0ba690
Packit 0ba690
      /* Check for compression errors */
Packit 0ba690
      if (ret != Z_OK)
Packit 0ba690
      {
Packit 0ba690
         if (png_ptr->zstream.msg != NULL)
Packit 0ba690
            png_error(png_ptr, png_ptr->zstream.msg);
Packit 0ba690
         else
Packit 0ba690
            png_error(png_ptr, "zlib error");
Packit 0ba690
      }
Packit 0ba690
Packit 0ba690
      if (!(png_ptr->zstream.avail_out))
Packit 0ba690
      {
Packit 0ba690
         /* Write the IDAT and reset the zlib output buffer */
Packit 0ba690
         png_write_IDAT(png_ptr, png_ptr->zbuf,
Packit 0ba690
                        png_ptr->zbuf_size);
Packit 0ba690
         png_ptr->zstream.next_out = png_ptr->zbuf;
Packit 0ba690
         png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
Packit 0ba690
         wrote_IDAT = 1;
Packit 0ba690
      }
Packit 0ba690
   } while(wrote_IDAT == 1);
Packit 0ba690
Packit 0ba690
   /* If there is any data left to be output, write it into a new IDAT */
Packit 0ba690
   if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
Packit 0ba690
   {
Packit 0ba690
      /* Write the IDAT and reset the zlib output buffer */
Packit 0ba690
      png_write_IDAT(png_ptr, png_ptr->zbuf,
Packit 0ba690
                     png_ptr->zbuf_size - png_ptr->zstream.avail_out);
Packit 0ba690
      png_ptr->zstream.next_out = png_ptr->zbuf;
Packit 0ba690
      png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
Packit 0ba690
   }
Packit 0ba690
   png_ptr->flush_rows = 0;
Packit 0ba690
   png_flush(png_ptr);
Packit 0ba690
}
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#endif /* PNG_WRITE_FLUSH_SUPPORTED */
Packit 0ba690
Packit 0ba690
/* Free all memory used by the write */
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void PNGAPI
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png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
Packit 0ba690
{
Packit 0ba690
   png_structp png_ptr = NULL;
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   png_infop info_ptr = NULL;
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#ifdef PNG_USER_MEM_SUPPORTED
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   png_free_ptr free_fn = NULL;
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   png_voidp mem_ptr = NULL;
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   png_debug(1, "in png_destroy_write_struct");
Packit 0ba690
Packit 0ba690
   if (png_ptr_ptr != NULL)
Packit 0ba690
   {
Packit 0ba690
      png_ptr = *png_ptr_ptr;
Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
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      free_fn = png_ptr->free_fn;
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      mem_ptr = png_ptr->mem_ptr;
Packit 0ba690
#endif
Packit 0ba690
   }
Packit 0ba690
Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
Packit 0ba690
   if (png_ptr != NULL)
Packit 0ba690
   {
Packit 0ba690
      free_fn = png_ptr->free_fn;
Packit 0ba690
      mem_ptr = png_ptr->mem_ptr;
Packit 0ba690
   }
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   if (info_ptr_ptr != NULL)
Packit 0ba690
      info_ptr = *info_ptr_ptr;
Packit 0ba690
Packit 0ba690
   if (info_ptr != NULL)
Packit 0ba690
   {
Packit 0ba690
      if (png_ptr != NULL)
Packit 0ba690
      {
Packit 0ba690
        png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
Packit 0ba690
Packit 0ba690
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
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        if (png_ptr->num_chunk_list)
Packit 0ba690
        {
Packit 0ba690
           png_free(png_ptr, png_ptr->chunk_list);
Packit 0ba690
           png_ptr->chunk_list = NULL;
Packit 0ba690
           png_ptr->num_chunk_list = 0;
Packit 0ba690
        }
Packit 0ba690
#endif
Packit 0ba690
      }
Packit 0ba690
Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
Packit 0ba690
      png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
Packit 0ba690
         (png_voidp)mem_ptr);
Packit 0ba690
#else
Packit 0ba690
      png_destroy_struct((png_voidp)info_ptr);
Packit 0ba690
#endif
Packit 0ba690
      *info_ptr_ptr = NULL;
Packit 0ba690
   }
Packit 0ba690
Packit 0ba690
   if (png_ptr != NULL)
Packit 0ba690
   {
Packit 0ba690
      png_write_destroy(png_ptr);
Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
Packit 0ba690
      png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
Packit 0ba690
         (png_voidp)mem_ptr);
Packit 0ba690
#else
Packit 0ba690
      png_destroy_struct((png_voidp)png_ptr);
Packit 0ba690
#endif
Packit 0ba690
      *png_ptr_ptr = NULL;
Packit 0ba690
   }
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
Packit 0ba690
/* Free any memory used in png_ptr struct (old method) */
Packit 0ba690
void /* PRIVATE */
Packit 0ba690
png_write_destroy(png_structp png_ptr)
Packit 0ba690
{
Packit 0ba690
#ifdef PNG_SETJMP_SUPPORTED
Packit 0ba690
   jmp_buf tmp_jmp; /* Save jump buffer */
Packit 0ba690
#endif
Packit 0ba690
   png_error_ptr error_fn;
Packit 0ba690
   png_error_ptr warning_fn;
Packit 0ba690
   png_voidp error_ptr;
Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
Packit 0ba690
   png_free_ptr free_fn;
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   png_debug(1, "in png_write_destroy");
Packit 0ba690
Packit 0ba690
   /* Free any memory zlib uses */
Packit 0ba690
   deflateEnd(&png_ptr->zstream);
Packit 0ba690
Packit 0ba690
   /* Free our memory.  png_free checks NULL for us. */
Packit 0ba690
   png_free(png_ptr, png_ptr->zbuf);
Packit 0ba690
   png_free(png_ptr, png_ptr->row_buf);
Packit 0ba690
#ifdef PNG_WRITE_FILTER_SUPPORTED
Packit 0ba690
   png_free(png_ptr, png_ptr->prev_row);
Packit 0ba690
   png_free(png_ptr, png_ptr->sub_row);
Packit 0ba690
   png_free(png_ptr, png_ptr->up_row);
Packit 0ba690
   png_free(png_ptr, png_ptr->avg_row);
Packit 0ba690
   png_free(png_ptr, png_ptr->paeth_row);
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
#ifdef PNG_TIME_RFC1123_SUPPORTED
Packit 0ba690
   png_free(png_ptr, png_ptr->time_buffer);
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
#ifdef PNG_SETJMP_SUPPORTED
Packit 0ba690
   /* Reset structure */
Packit 0ba690
   png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   error_fn = png_ptr->error_fn;
Packit 0ba690
   warning_fn = png_ptr->warning_fn;
Packit 0ba690
   error_ptr = png_ptr->error_ptr;
Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
Packit 0ba690
   free_fn = png_ptr->free_fn;
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
   png_memset(png_ptr, 0, png_sizeof(png_struct));
Packit 0ba690
Packit 0ba690
   png_ptr->error_fn = error_fn;
Packit 0ba690
   png_ptr->warning_fn = warning_fn;
Packit 0ba690
   png_ptr->error_ptr = error_ptr;
Packit 0ba690
#ifdef PNG_USER_MEM_SUPPORTED
Packit 0ba690
   png_ptr->free_fn = free_fn;
Packit 0ba690
#endif
Packit 0ba690
Packit 0ba690
#ifdef PNG_SETJMP_SUPPORTED
Packit 0ba690
   png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
Packit 0ba690
#endif
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
/* Allow the application to select one or more row filters to use. */
Packit 0ba690
void PNGAPI
Packit 0ba690
png_set_filter(png_structp png_ptr, int method, int filters)
Packit 0ba690
{
Packit 0ba690
   png_debug(1, "in png_set_filter");
Packit 0ba690
Packit 0ba690
   if (png_ptr == NULL)
Packit 0ba690
      return;
Packit 0ba690
#ifdef PNG_MNG_FEATURES_SUPPORTED
Packit 0ba690
   if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
Packit 0ba690
      (method == PNG_INTRAPIXEL_DIFFERENCING))
Packit 0ba690
         method = PNG_FILTER_TYPE_BASE;
Packit 0ba690
#endif
Packit 0ba690
   if (method == PNG_FILTER_TYPE_BASE)
Packit 0ba690
   {
Packit 0ba690
      switch (filters & (PNG_ALL_FILTERS | 0x07))
Packit 0ba690
      {
Packit 0ba690
         case PNG_FILTER_VALUE_NONE:
Packit 0ba690
              png_ptr->do_filter = PNG_FILTER_NONE; break;
Packit 0ba690
#ifdef PNG_WRITE_FILTER_SUPPORTED
Packit 0ba690
         case 5:
Packit 0ba690
         case 6:
Packit 0ba690
         case 7: png_warning(png_ptr, "Unknown row filter for method 0");
Packit 0ba690
                 break;
Packit 0ba690
         case PNG_FILTER_VALUE_SUB:
Packit 0ba690
              png_ptr->do_filter = PNG_FILTER_SUB; break;
Packit 0ba690
         case PNG_FILTER_VALUE_UP:
Packit 0ba690
              png_ptr->do_filter = PNG_FILTER_UP; break;
Packit 0ba690
         case PNG_FILTER_VALUE_AVG:
Packit 0ba690
              png_ptr->do_filter = PNG_FILTER_AVG; break;
Packit 0ba690
         case PNG_FILTER_VALUE_PAETH:
Packit 0ba690
              png_ptr->do_filter = PNG_FILTER_PAETH; break;
Packit 0ba690
         default: png_ptr->do_filter = (png_byte)filters; break;
Packit 0ba690
#else
Packit 0ba690
         default: png_warning(png_ptr, "Unknown row filter for method 0");
Packit 0ba690
                 break;
Packit 0ba690
#endif /* PNG_WRITE_FILTER_SUPPORTED */
Packit 0ba690
      }
Packit 0ba690
Packit 0ba690
      /* If we have allocated the row_buf, this means we have already started
Packit 0ba690
       * with the image and we should have allocated all of the filter buffers
Packit 0ba690
       * that have been selected.  If prev_row isn't already allocated, then
Packit 0ba690
       * it is too late to start using the filters that need it, since we
Packit 0ba690
       * will be missing the data in the previous row.  If an application
Packit 0ba690
       * wants to start and stop using particular filters during compression,
Packit 0ba690
       * it should start out with all of the filters, and then add and
Packit 0ba690
       * remove them after the start of compression.
Packit 0ba690
       */
Packit 0ba690
      if (png_ptr->row_buf != NULL)
Packit 0ba690
      {
Packit 0ba690
#ifdef PNG_WRITE_FILTER_SUPPORTED
Packit 0ba690
         if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
Packit 0ba690
         {
Packit 0ba690
            png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
Packit 0ba690
              (png_ptr->rowbytes + 1));
Packit 0ba690
            png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
Packit 0ba690
         }
Packit 0ba690
Packit 0ba690
         if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
Packit 0ba690
         {
Packit 0ba690
            if (png_ptr->prev_row == NULL)
Packit 0ba690
            {
Packit 0ba690
               png_warning(png_ptr, "Can't add Up filter after starting");
Packit 0ba690
               png_ptr->do_filter &= ~PNG_FILTER_UP;
Packit 0ba690
            }
Packit 0ba690
            else
Packit 0ba690
            {
Packit 0ba690
               png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
Packit 0ba690
                  (png_ptr->rowbytes + 1));
Packit 0ba690
               png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
Packit 0ba690
            }
Packit 0ba690
         }
Packit 0ba690
Packit 0ba690
         if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
Packit 0ba690
         {
Packit 0ba690
            if (png_ptr->prev_row == NULL)
Packit 0ba690
            {
Packit 0ba690
               png_warning(png_ptr, "Can't add Average filter after starting");
Packit 0ba690
               png_ptr->do_filter &= ~PNG_FILTER_AVG;
Packit 0ba690
            }
Packit 0ba690
            else
Packit 0ba690
            {
Packit 0ba690
               png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
Packit 0ba690
                  (png_ptr->rowbytes + 1));
Packit 0ba690
               png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
Packit 0ba690
            }
Packit 0ba690
         }
Packit 0ba690
Packit 0ba690
         if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
Packit 0ba690
             png_ptr->paeth_row == NULL)
Packit 0ba690
         {
Packit 0ba690
            if (png_ptr->prev_row == NULL)
Packit 0ba690
            {
Packit 0ba690
               png_warning(png_ptr, "Can't add Paeth filter after starting");
Packit 0ba690
               png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
Packit 0ba690
            }
Packit 0ba690
            else
Packit 0ba690
            {
Packit 0ba690
               png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
Packit 0ba690
                  (png_ptr->rowbytes + 1));
Packit 0ba690
               png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
Packit 0ba690
            }
Packit 0ba690
         }
Packit 0ba690
Packit 0ba690
         if (png_ptr->do_filter == PNG_NO_FILTERS)
Packit 0ba690
#endif /* PNG_WRITE_FILTER_SUPPORTED */
Packit 0ba690
            png_ptr->do_filter = PNG_FILTER_NONE;
Packit 0ba690
      }
Packit 0ba690
   }
Packit 0ba690
   else
Packit 0ba690
      png_error(png_ptr, "Unknown custom filter method");
Packit 0ba690
}
Packit 0ba690
Packit 0ba690
/* This allows us to influence the way in which libpng chooses the "best"
Packit 0ba690
 * filter for the current scanline.  While the "minimum-sum-of-absolute-
Packit 0ba690
 * differences metric is relatively fast and effective, there is some
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 * question as to whether it can be improved upon by trying to keep the
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 * filtered data going to zlib more consistent, hopefully resulting in
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 * better compression.
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 */
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#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED      /* GRR 970116 */
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void PNGAPI
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png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
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   int num_weights, png_doublep filter_weights,
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   png_doublep filter_costs)
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{
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   PNG_UNUSED(png_ptr)
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   PNG_UNUSED(heuristic_method)
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   PNG_UNUSED(num_weights)
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   PNG_UNUSED(filter_weights)
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   PNG_UNUSED(filter_costs)
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}
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#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
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void PNGAPI
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png_set_compression_level(png_structp png_ptr, int level)
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{
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   png_debug(1, "in png_set_compression_level");
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   if (png_ptr == NULL)
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      return;
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   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
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   png_ptr->zlib_level = level;
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}
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void PNGAPI
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png_set_compression_mem_level(png_structp png_ptr, int mem_level)
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{
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   png_debug(1, "in png_set_compression_mem_level");
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   if (png_ptr == NULL)
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      return;
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   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
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   png_ptr->zlib_mem_level = mem_level;
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}
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void PNGAPI
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png_set_compression_strategy(png_structp png_ptr, int strategy)
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{
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   png_debug(1, "in png_set_compression_strategy");
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   if (png_ptr == NULL)
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      return;
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   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
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   png_ptr->zlib_strategy = strategy;
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}
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void PNGAPI
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png_set_compression_window_bits(png_structp png_ptr, int window_bits)
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{
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   if (png_ptr == NULL)
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      return;
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   if (window_bits > 15)
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      png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
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   else if (window_bits < 8)
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      png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
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#ifndef WBITS_8_OK
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   /* Avoid libpng bug with 256-byte windows */
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   if (window_bits == 8)
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     {
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       png_warning(png_ptr, "Compression window is being reset to 512");
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       window_bits = 9;
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     }
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#endif
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   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
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   png_ptr->zlib_window_bits = window_bits;
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}
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void PNGAPI
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png_set_compression_method(png_structp png_ptr, int method)
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{
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   png_debug(1, "in png_set_compression_method");
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   if (png_ptr == NULL)
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      return;
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   if (method != 8)
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      png_warning(png_ptr, "Only compression method 8 is supported by PNG");
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   png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
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   png_ptr->zlib_method = method;
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}
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void PNGAPI
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png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
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{
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   if (png_ptr == NULL)
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      return;
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   png_ptr->write_row_fn = write_row_fn;
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}
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#ifdef PNG_WRITE_USER_TRANSFORM_SUPPORTED
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void PNGAPI
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png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
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   write_user_transform_fn)
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{
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   png_debug(1, "in png_set_write_user_transform_fn");
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   if (png_ptr == NULL)
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      return;
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   png_ptr->transformations |= PNG_USER_TRANSFORM;
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   png_ptr->write_user_transform_fn = write_user_transform_fn;
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}
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#endif
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#ifdef PNG_INFO_IMAGE_SUPPORTED
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void PNGAPI
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png_write_png(png_structp png_ptr, png_infop info_ptr,
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              int transforms, voidp params)
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{
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   if (png_ptr == NULL || info_ptr == NULL)
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      return;
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   /* Write the file header information. */
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   png_write_info(png_ptr, info_ptr);
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   /* ------ these transformations don't touch the info structure ------- */
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#ifdef PNG_WRITE_INVERT_SUPPORTED
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   /* Invert monochrome pixels */
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   if (transforms & PNG_TRANSFORM_INVERT_MONO)
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      png_set_invert_mono(png_ptr);
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#endif
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#ifdef PNG_WRITE_SHIFT_SUPPORTED
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   /* Shift the pixels up to a legal bit depth and fill in
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    * as appropriate to correctly scale the image.
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    */
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   if ((transforms & PNG_TRANSFORM_SHIFT)
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               && (info_ptr->valid & PNG_INFO_sBIT))
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      png_set_shift(png_ptr, &info_ptr->sig_bit);
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#endif
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#ifdef PNG_WRITE_PACK_SUPPORTED
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   /* Pack pixels into bytes */
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   if (transforms & PNG_TRANSFORM_PACKING)
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       png_set_packing(png_ptr);
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#endif
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#ifdef PNG_WRITE_SWAP_ALPHA_SUPPORTED
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   /* Swap location of alpha bytes from ARGB to RGBA */
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   if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
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      png_set_swap_alpha(png_ptr);
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#endif
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#ifdef PNG_WRITE_FILLER_SUPPORTED
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   /* Pack XRGB/RGBX/ARGB/RGBA into * RGB (4 channels -> 3 channels) */
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   if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
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      png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
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   else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
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      png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
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#endif
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#ifdef PNG_WRITE_BGR_SUPPORTED
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   /* Flip BGR pixels to RGB */
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   if (transforms & PNG_TRANSFORM_BGR)
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      png_set_bgr(png_ptr);
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#endif
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#ifdef PNG_WRITE_SWAP_SUPPORTED
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   /* Swap bytes of 16-bit files to most significant byte first */
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   if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
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      png_set_swap(png_ptr);
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#endif
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#ifdef PNG_WRITE_PACKSWAP_SUPPORTED
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   /* Swap bits of 1, 2, 4 bit packed pixel formats */
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   if (transforms & PNG_TRANSFORM_PACKSWAP)
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      png_set_packswap(png_ptr);
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#endif
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#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
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   /* Invert the alpha channel from opacity to transparency */
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   if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
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      png_set_invert_alpha(png_ptr);
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#endif
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   /* ----------------------- end of transformations ------------------- */
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   /* Write the bits */
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   if (info_ptr->valid & PNG_INFO_IDAT)
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       png_write_image(png_ptr, info_ptr->row_pointers);
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   /* It is REQUIRED to call this to finish writing the rest of the file */
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   png_write_end(png_ptr, info_ptr);
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   PNG_UNUSED(transforms) /* Quiet compiler warnings */
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   PNG_UNUSED(params)
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}
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#endif
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#endif /* PNG_WRITE_SUPPORTED */