nuclear@14: 
nuclear@14: /* pngwrite.c - general routines to write a PNG file
nuclear@14:  *
nuclear@14:  * Last changed in libpng 1.2.31 [August 19, 2008]
nuclear@14:  * For conditions of distribution and use, see copyright notice in png.h
nuclear@14:  * Copyright (c) 1998-2008 Glenn Randers-Pehrson
nuclear@14:  * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
nuclear@14:  * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
nuclear@14:  */
nuclear@14: 
nuclear@14: /* get internal access to png.h */
nuclear@14: #define PNG_INTERNAL
nuclear@14: #include "png.h"
nuclear@14: #ifdef PNG_WRITE_SUPPORTED
nuclear@14: 
nuclear@14: /* Writes all the PNG information.  This is the suggested way to use the
nuclear@14:  * library.  If you have a new chunk to add, make a function to write it,
nuclear@14:  * and put it in the correct location here.  If you want the chunk written
nuclear@14:  * after the image data, put it in png_write_end().  I strongly encourage
nuclear@14:  * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
nuclear@14:  * the chunk, as that will keep the code from breaking if you want to just
nuclear@14:  * write a plain PNG file.  If you have long comments, I suggest writing
nuclear@14:  * them in png_write_end(), and compressing them.
nuclear@14:  */
nuclear@14: void PNGAPI
nuclear@14: png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_write_info_before_PLTE\n");
nuclear@14:    if (png_ptr == NULL || info_ptr == NULL)
nuclear@14:       return;
nuclear@14:    if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@14:    {
nuclear@14:    png_write_sig(png_ptr); /* write PNG signature */
nuclear@14: #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@14:    if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
nuclear@14:    {
nuclear@14:       png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
nuclear@14:       png_ptr->mng_features_permitted=0;
nuclear@14:    }
nuclear@14: #endif
nuclear@14:    /* write IHDR information. */
nuclear@14:    png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
nuclear@14:       info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
nuclear@14:       info_ptr->filter_type,
nuclear@14: #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@14:       info_ptr->interlace_type);
nuclear@14: #else
nuclear@14:       0);
nuclear@14: #endif
nuclear@14:    /* the rest of these check to see if the valid field has the appropriate
nuclear@14:       flag set, and if it does, writes the chunk. */
nuclear@14: #if defined(PNG_WRITE_gAMA_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_gAMA)
nuclear@14:    {
nuclear@14: #  ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@14:       png_write_gAMA(png_ptr, info_ptr->gamma);
nuclear@14: #else
nuclear@14: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@14:       png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
nuclear@14: #  endif
nuclear@14: #endif
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_sRGB_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_sRGB)
nuclear@14:       png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_iCCP_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_iCCP)
nuclear@14:       png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
nuclear@14:                      info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_sBIT_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_sBIT)
nuclear@14:       png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_cHRM_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_cHRM)
nuclear@14:    {
nuclear@14: #ifdef PNG_FLOATING_POINT_SUPPORTED
nuclear@14:       png_write_cHRM(png_ptr,
nuclear@14:          info_ptr->x_white, info_ptr->y_white,
nuclear@14:          info_ptr->x_red, info_ptr->y_red,
nuclear@14:          info_ptr->x_green, info_ptr->y_green,
nuclear@14:          info_ptr->x_blue, info_ptr->y_blue);
nuclear@14: #else
nuclear@14: #  ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@14:       png_write_cHRM_fixed(png_ptr,
nuclear@14:          info_ptr->int_x_white, info_ptr->int_y_white,
nuclear@14:          info_ptr->int_x_red, info_ptr->int_y_red,
nuclear@14:          info_ptr->int_x_green, info_ptr->int_y_green,
nuclear@14:          info_ptr->int_x_blue, info_ptr->int_y_blue);
nuclear@14: #  endif
nuclear@14: #endif
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14:    if (info_ptr->unknown_chunks_num)
nuclear@14:    {
nuclear@14:        png_unknown_chunk *up;
nuclear@14: 
nuclear@14:        png_debug(5, "writing extra chunks\n");
nuclear@14: 
nuclear@14:        for (up = info_ptr->unknown_chunks;
nuclear@14:             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@14:             up++)
nuclear@14:        {
nuclear@14:          int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@14:          if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@14:             up->location && !(up->location & PNG_HAVE_PLTE) &&
nuclear@14:             !(up->location & PNG_HAVE_IDAT) &&
nuclear@14:             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@14:             (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@14:          {
nuclear@14:             if (up->size == 0)
nuclear@14:                png_warning(png_ptr, "Writing zero-length unknown chunk");
nuclear@14:             png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@14:          }
nuclear@14:        }
nuclear@14:    }
nuclear@14: #endif
nuclear@14:       png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_write_info(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14: #if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@14:    int i;
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_debug(1, "in png_write_info\n");
nuclear@14: 
nuclear@14:    if (png_ptr == NULL || info_ptr == NULL)
nuclear@14:       return;
nuclear@14: 
nuclear@14:    png_write_info_before_PLTE(png_ptr, info_ptr);
nuclear@14: 
nuclear@14:    if (info_ptr->valid & PNG_INFO_PLTE)
nuclear@14:       png_write_PLTE(png_ptr, info_ptr->palette,
nuclear@14:          (png_uint_32)info_ptr->num_palette);
nuclear@14:    else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@14:       png_error(png_ptr, "Valid palette required for paletted images");
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_tRNS_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_tRNS)
nuclear@14:       {
nuclear@14: #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@14:          /* invert the alpha channel (in tRNS) */
nuclear@14:          if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
nuclear@14:             info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
nuclear@14:          {
nuclear@14:             int j;
nuclear@14:             for (j=0; j<(int)info_ptr->num_trans; j++)
nuclear@14:                info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
nuclear@14:          }
nuclear@14: #endif
nuclear@14:       png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
nuclear@14:          info_ptr->num_trans, info_ptr->color_type);
nuclear@14:       }
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_bKGD_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_bKGD)
nuclear@14:       png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_hIST_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_hIST)
nuclear@14:       png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_oFFs_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_oFFs)
nuclear@14:       png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
nuclear@14:          info_ptr->offset_unit_type);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_pCAL_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_pCAL)
nuclear@14:       png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
nuclear@14:          info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
nuclear@14:          info_ptr->pcal_units, info_ptr->pcal_params);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_sCAL_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_sCAL)
nuclear@14: #if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
nuclear@14:       png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
nuclear@14:           info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
nuclear@14: #else
nuclear@14: #ifdef PNG_FIXED_POINT_SUPPORTED
nuclear@14:       png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
nuclear@14:           info_ptr->scal_s_width, info_ptr->scal_s_height);
nuclear@14: #else
nuclear@14:       png_warning(png_ptr,
nuclear@14:           "png_write_sCAL not supported; sCAL chunk not written.");
nuclear@14: #endif
nuclear@14: #endif
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_pHYs_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_pHYs)
nuclear@14:       png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
nuclear@14:          info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_tIME)
nuclear@14:    {
nuclear@14:       png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@14:       png_ptr->mode |= PNG_WROTE_tIME;
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_sPLT_SUPPORTED)
nuclear@14:    if (info_ptr->valid & PNG_INFO_sPLT)
nuclear@14:      for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
nuclear@14:        png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@14:    /* Check to see if we need to write text chunks */
nuclear@14:    for (i = 0; i < info_ptr->num_text; i++)
nuclear@14:    {
nuclear@14:       png_debug2(2, "Writing header text chunk %d, type %d\n", i,
nuclear@14:          info_ptr->text[i].compression);
nuclear@14:       /* an internationalized chunk? */
nuclear@14:       if (info_ptr->text[i].compression > 0)
nuclear@14:       {
nuclear@14: #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@14:           /* write international chunk */
nuclear@14:           png_write_iTXt(png_ptr,
nuclear@14:                          info_ptr->text[i].compression,
nuclear@14:                          info_ptr->text[i].key,
nuclear@14:                          info_ptr->text[i].lang,
nuclear@14:                          info_ptr->text[i].lang_key,
nuclear@14:                          info_ptr->text[i].text);
nuclear@14: #else
nuclear@14:           png_warning(png_ptr, "Unable to write international text");
nuclear@14: #endif
nuclear@14:           /* Mark this chunk as written */
nuclear@14:           info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@14:       }
nuclear@14:       /* If we want a compressed text chunk */
nuclear@14:       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
nuclear@14:       {
nuclear@14: #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@14:          /* write compressed chunk */
nuclear@14:          png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@14:             info_ptr->text[i].text, 0,
nuclear@14:             info_ptr->text[i].compression);
nuclear@14: #else
nuclear@14:          png_warning(png_ptr, "Unable to write compressed text");
nuclear@14: #endif
nuclear@14:          /* Mark this chunk as written */
nuclear@14:          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@14:       }
nuclear@14:       else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@14:       {
nuclear@14: #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@14:          /* write uncompressed chunk */
nuclear@14:          png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@14:                          info_ptr->text[i].text,
nuclear@14:                          0);
nuclear@14: #else
nuclear@14:          png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@14: #endif
nuclear@14:          /* Mark this chunk as written */
nuclear@14:          info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@14:       }
nuclear@14:    }
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14:    if (info_ptr->unknown_chunks_num)
nuclear@14:    {
nuclear@14:        png_unknown_chunk *up;
nuclear@14: 
nuclear@14:        png_debug(5, "writing extra chunks\n");
nuclear@14: 
nuclear@14:        for (up = info_ptr->unknown_chunks;
nuclear@14:             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@14:             up++)
nuclear@14:        {
nuclear@14:          int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@14:          if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@14:             up->location && (up->location & PNG_HAVE_PLTE) &&
nuclear@14:             !(up->location & PNG_HAVE_IDAT) &&
nuclear@14:             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@14:             (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@14:          {
nuclear@14:             png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@14:          }
nuclear@14:        }
nuclear@14:    }
nuclear@14: #endif
nuclear@14: }
nuclear@14: 
nuclear@14: /* Writes the end of the PNG file.  If you don't want to write comments or
nuclear@14:  * time information, you can pass NULL for info.  If you already wrote these
nuclear@14:  * in png_write_info(), do not write them again here.  If you have long
nuclear@14:  * comments, I suggest writing them here, and compressing them.
nuclear@14:  */
nuclear@14: void PNGAPI
nuclear@14: png_write_end(png_structp png_ptr, png_infop info_ptr)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_write_end\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    if (!(png_ptr->mode & PNG_HAVE_IDAT))
nuclear@14:       png_error(png_ptr, "No IDATs written into file");
nuclear@14: 
nuclear@14:    /* see if user wants us to write information chunks */
nuclear@14:    if (info_ptr != NULL)
nuclear@14:    {
nuclear@14: #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@14:       int i; /* local index variable */
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@14:       /* check to see if user has supplied a time chunk */
nuclear@14:       if ((info_ptr->valid & PNG_INFO_tIME) &&
nuclear@14:          !(png_ptr->mode & PNG_WROTE_tIME))
nuclear@14:          png_write_tIME(png_ptr, &(info_ptr->mod_time));
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_TEXT_SUPPORTED)
nuclear@14:       /* loop through comment chunks */
nuclear@14:       for (i = 0; i < info_ptr->num_text; i++)
nuclear@14:       {
nuclear@14:          png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
nuclear@14:             info_ptr->text[i].compression);
nuclear@14:          /* an internationalized chunk? */
nuclear@14:          if (info_ptr->text[i].compression > 0)
nuclear@14:          {
nuclear@14: #if defined(PNG_WRITE_iTXt_SUPPORTED)
nuclear@14:              /* write international chunk */
nuclear@14:              png_write_iTXt(png_ptr,
nuclear@14:                          info_ptr->text[i].compression,
nuclear@14:                          info_ptr->text[i].key,
nuclear@14:                          info_ptr->text[i].lang,
nuclear@14:                          info_ptr->text[i].lang_key,
nuclear@14:                          info_ptr->text[i].text);
nuclear@14: #else
nuclear@14:              png_warning(png_ptr, "Unable to write international text");
nuclear@14: #endif
nuclear@14:              /* Mark this chunk as written */
nuclear@14:              info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@14:          }
nuclear@14:          else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
nuclear@14:          {
nuclear@14: #if defined(PNG_WRITE_zTXt_SUPPORTED)
nuclear@14:             /* write compressed chunk */
nuclear@14:             png_write_zTXt(png_ptr, info_ptr->text[i].key,
nuclear@14:                info_ptr->text[i].text, 0,
nuclear@14:                info_ptr->text[i].compression);
nuclear@14: #else
nuclear@14:             png_warning(png_ptr, "Unable to write compressed text");
nuclear@14: #endif
nuclear@14:             /* Mark this chunk as written */
nuclear@14:             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
nuclear@14:          }
nuclear@14:          else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
nuclear@14:          {
nuclear@14: #if defined(PNG_WRITE_tEXt_SUPPORTED)
nuclear@14:             /* write uncompressed chunk */
nuclear@14:             png_write_tEXt(png_ptr, info_ptr->text[i].key,
nuclear@14:                info_ptr->text[i].text, 0);
nuclear@14: #else
nuclear@14:             png_warning(png_ptr, "Unable to write uncompressed text");
nuclear@14: #endif
nuclear@14: 
nuclear@14:             /* Mark this chunk as written */
nuclear@14:             info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
nuclear@14:          }
nuclear@14:       }
nuclear@14: #endif
nuclear@14: #if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14:    if (info_ptr->unknown_chunks_num)
nuclear@14:    {
nuclear@14:        png_unknown_chunk *up;
nuclear@14: 
nuclear@14:        png_debug(5, "writing extra chunks\n");
nuclear@14: 
nuclear@14:        for (up = info_ptr->unknown_chunks;
nuclear@14:             up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
nuclear@14:             up++)
nuclear@14:        {
nuclear@14:          int keep=png_handle_as_unknown(png_ptr, up->name);
nuclear@14:          if (keep != PNG_HANDLE_CHUNK_NEVER &&
nuclear@14:             up->location && (up->location & PNG_AFTER_IDAT) &&
nuclear@14:             ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
nuclear@14:             (png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
nuclear@14:          {
nuclear@14:             png_write_chunk(png_ptr, up->name, up->data, up->size);
nuclear@14:          }
nuclear@14:        }
nuclear@14:    }
nuclear@14: #endif
nuclear@14:    }
nuclear@14: 
nuclear@14:    png_ptr->mode |= PNG_AFTER_IDAT;
nuclear@14: 
nuclear@14:    /* write end of PNG file */
nuclear@14:    png_write_IEND(png_ptr);
nuclear@14:    /* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
nuclear@14:     * and restored again in libpng-1.2.30, may cause some applications that
nuclear@14:     * do not set png_ptr->output_flush_fn to crash.  If your application
nuclear@14:     * experiences a problem, please try building libpng with
nuclear@14:     * PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
nuclear@14:     * png-mng-implement at lists.sf.net .  This kludge will be removed
nuclear@14:     * from libpng-1.4.0.
nuclear@14:     */
nuclear@14: #if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
nuclear@14:     defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
nuclear@14:    png_flush(png_ptr);
nuclear@14: #endif
nuclear@14: }
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_tIME_SUPPORTED)
nuclear@14: #if !defined(_WIN32_WCE)
nuclear@14: /* "time.h" functions are not supported on WindowsCE */
nuclear@14: void PNGAPI
nuclear@14: png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_convert_from_struct_tm\n");
nuclear@14:    ptime->year = (png_uint_16)(1900 + ttime->tm_year);
nuclear@14:    ptime->month = (png_byte)(ttime->tm_mon + 1);
nuclear@14:    ptime->day = (png_byte)ttime->tm_mday;
nuclear@14:    ptime->hour = (png_byte)ttime->tm_hour;
nuclear@14:    ptime->minute = (png_byte)ttime->tm_min;
nuclear@14:    ptime->second = (png_byte)ttime->tm_sec;
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_convert_from_time_t(png_timep ptime, time_t ttime)
nuclear@14: {
nuclear@14:    struct tm *tbuf;
nuclear@14: 
nuclear@14:    png_debug(1, "in png_convert_from_time_t\n");
nuclear@14:    tbuf = gmtime(&ttime);
nuclear@14:    png_convert_from_struct_tm(ptime, tbuf);
nuclear@14: }
nuclear@14: #endif
nuclear@14: #endif
nuclear@14: 
nuclear@14: /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@14: png_structp PNGAPI
nuclear@14: png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@14:    png_error_ptr error_fn, png_error_ptr warn_fn)
nuclear@14: {
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
nuclear@14:       warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
nuclear@14: }
nuclear@14: 
nuclear@14: /* Alternate initialize png_ptr structure, and allocate any memory needed */
nuclear@14: png_structp PNGAPI
nuclear@14: png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
nuclear@14:    png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
nuclear@14:    png_malloc_ptr malloc_fn, png_free_ptr free_fn)
nuclear@14: {
nuclear@14: #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14:     volatile
nuclear@14: #endif
nuclear@14:     png_structp png_ptr;
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14: #ifdef USE_FAR_KEYWORD
nuclear@14:    jmp_buf jmpbuf;
nuclear@14: #endif
nuclear@14: #endif
nuclear@14:    int i;
nuclear@14:    png_debug(1, "in png_create_write_struct\n");
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
nuclear@14:       (png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
nuclear@14: #else
nuclear@14:    png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@14: #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return (NULL);
nuclear@14: 
nuclear@14:    /* added at libpng-1.2.6 */
nuclear@14: #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@14:    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@14:    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@14: #endif
nuclear@14: 
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14: #ifdef USE_FAR_KEYWORD
nuclear@14:    if (setjmp(jmpbuf))
nuclear@14: #else
nuclear@14:    if (setjmp(png_ptr->jmpbuf))
nuclear@14: #endif
nuclear@14:    {
nuclear@14:       png_free(png_ptr, png_ptr->zbuf);
nuclear@14:        png_ptr->zbuf=NULL;
nuclear@14:       png_destroy_struct(png_ptr);
nuclear@14:       return (NULL);
nuclear@14:    }
nuclear@14: #ifdef USE_FAR_KEYWORD
nuclear@14:    png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@14: #endif
nuclear@14: #endif
nuclear@14: 
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
nuclear@14: #endif /* PNG_USER_MEM_SUPPORTED */
nuclear@14:    png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
nuclear@14: 
nuclear@14:    if (user_png_ver)
nuclear@14:    {
nuclear@14:      i=0;
nuclear@14:      do
nuclear@14:      {
nuclear@14:        if (user_png_ver[i] != png_libpng_ver[i])
nuclear@14:           png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@14:      } while (png_libpng_ver[i++]);
nuclear@14:    }
nuclear@14: 
nuclear@14:    if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
nuclear@14:    {
nuclear@14:      /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
nuclear@14:       * we must recompile any applications that use any older library version.
nuclear@14:       * For versions after libpng 1.0, we will be compatible, so we need
nuclear@14:       * only check the first digit.
nuclear@14:       */
nuclear@14:      if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
nuclear@14:          (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
nuclear@14:          (user_png_ver[0] == '0' && user_png_ver[2] < '9'))
nuclear@14:      {
nuclear@14: #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@14:         char msg[80];
nuclear@14:         if (user_png_ver)
nuclear@14:         {
nuclear@14:           png_snprintf(msg, 80,
nuclear@14:              "Application was compiled with png.h from libpng-%.20s",
nuclear@14:              user_png_ver);
nuclear@14:           png_warning(png_ptr, msg);
nuclear@14:         }
nuclear@14:         png_snprintf(msg, 80,
nuclear@14:            "Application  is  running with png.c from libpng-%.20s",
nuclear@14:            png_libpng_ver);
nuclear@14:         png_warning(png_ptr, msg);
nuclear@14: #endif
nuclear@14: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14:         png_ptr->flags=0;
nuclear@14: #endif
nuclear@14:         png_error(png_ptr,
nuclear@14:            "Incompatible libpng version in application and library");
nuclear@14:      }
nuclear@14:    }
nuclear@14: 
nuclear@14:    /* initialize zbuf - compression buffer */
nuclear@14:    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@14:    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@14:       (png_uint_32)png_ptr->zbuf_size);
nuclear@14: 
nuclear@14:    png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@14:       png_flush_ptr_NULL);
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@14:    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@14:       1, png_doublep_NULL, png_doublep_NULL);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14: /* Applications that neglect to set up their own setjmp() and then encounter
nuclear@14:    a png_error() will longjmp here.  Since the jmpbuf is then meaningless we
nuclear@14:    abort instead of returning. */
nuclear@14: #ifdef USE_FAR_KEYWORD
nuclear@14:    if (setjmp(jmpbuf))
nuclear@14:       PNG_ABORT();
nuclear@14:    png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
nuclear@14: #else
nuclear@14:    if (setjmp(png_ptr->jmpbuf))
nuclear@14:       PNG_ABORT();
nuclear@14: #endif
nuclear@14: #endif
nuclear@14:    return (png_ptr);
nuclear@14: }
nuclear@14: 
nuclear@14: /* Initialize png_ptr structure, and allocate any memory needed */
nuclear@14: #if defined(PNG_1_0_X) || defined(PNG_1_2_X)
nuclear@14: /* Deprecated. */
nuclear@14: #undef png_write_init
nuclear@14: void PNGAPI
nuclear@14: png_write_init(png_structp png_ptr)
nuclear@14: {
nuclear@14:    /* We only come here via pre-1.0.7-compiled applications */
nuclear@14:    png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
nuclear@14:    png_size_t png_struct_size, png_size_t png_info_size)
nuclear@14: {
nuclear@14:    /* We only come here via pre-1.0.12-compiled applications */
nuclear@14:    if (png_ptr == NULL) return;
nuclear@14: #if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
nuclear@14:    if (png_sizeof(png_struct) > png_struct_size ||
nuclear@14:       png_sizeof(png_info) > png_info_size)
nuclear@14:    {
nuclear@14:       char msg[80];
nuclear@14:       png_ptr->warning_fn=NULL;
nuclear@14:       if (user_png_ver)
nuclear@14:       {
nuclear@14:         png_snprintf(msg, 80,
nuclear@14:            "Application was compiled with png.h from libpng-%.20s",
nuclear@14:            user_png_ver);
nuclear@14:         png_warning(png_ptr, msg);
nuclear@14:       }
nuclear@14:       png_snprintf(msg, 80,
nuclear@14:          "Application  is  running with png.c from libpng-%.20s",
nuclear@14:          png_libpng_ver);
nuclear@14:       png_warning(png_ptr, msg);
nuclear@14:    }
nuclear@14: #endif
nuclear@14:    if (png_sizeof(png_struct) > png_struct_size)
nuclear@14:      {
nuclear@14:        png_ptr->error_fn=NULL;
nuclear@14: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14:        png_ptr->flags=0;
nuclear@14: #endif
nuclear@14:        png_error(png_ptr,
nuclear@14:        "The png struct allocated by the application for writing is too small.");
nuclear@14:      }
nuclear@14:    if (png_sizeof(png_info) > png_info_size)
nuclear@14:      {
nuclear@14:        png_ptr->error_fn=NULL;
nuclear@14: #ifdef PNG_ERROR_NUMBERS_SUPPORTED
nuclear@14:        png_ptr->flags=0;
nuclear@14: #endif
nuclear@14:        png_error(png_ptr,
nuclear@14:        "The info struct allocated by the application for writing is too small.");
nuclear@14:      }
nuclear@14:    png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
nuclear@14: }
nuclear@14: #endif /* PNG_1_0_X || PNG_1_2_X */
nuclear@14: 
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
nuclear@14:    png_size_t png_struct_size)
nuclear@14: {
nuclear@14:    png_structp png_ptr=*ptr_ptr;
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14:    jmp_buf tmp_jmp; /* to save current jump buffer */
nuclear@14: #endif
nuclear@14: 
nuclear@14:    int i = 0;
nuclear@14: 
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14: 
nuclear@14:    do
nuclear@14:    {
nuclear@14:      if (user_png_ver[i] != png_libpng_ver[i])
nuclear@14:      {
nuclear@14: #ifdef PNG_LEGACY_SUPPORTED
nuclear@14:        png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
nuclear@14: #else
nuclear@14:        png_ptr->warning_fn=NULL;
nuclear@14:        png_warning(png_ptr,
nuclear@14:  "Application uses deprecated png_write_init() and should be recompiled.");
nuclear@14:        break;
nuclear@14: #endif
nuclear@14:      }
nuclear@14:    } while (png_libpng_ver[i++]);
nuclear@14: 
nuclear@14:    png_debug(1, "in png_write_init_3\n");
nuclear@14: 
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14:    /* save jump buffer and error functions */
nuclear@14:    png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@14: #endif
nuclear@14: 
nuclear@14:    if (png_sizeof(png_struct) > png_struct_size)
nuclear@14:      {
nuclear@14:        png_destroy_struct(png_ptr);
nuclear@14:        png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
nuclear@14:        *ptr_ptr = png_ptr;
nuclear@14:      }
nuclear@14: 
nuclear@14:    /* reset all variables to 0 */
nuclear@14:    png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@14: 
nuclear@14:    /* added at libpng-1.2.6 */
nuclear@14: #ifdef PNG_SET_USER_LIMITS_SUPPORTED
nuclear@14:    png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
nuclear@14:    png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
nuclear@14: #endif
nuclear@14: 
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14:    /* restore jump buffer */
nuclear@14:    png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
nuclear@14:       png_flush_ptr_NULL);
nuclear@14: 
nuclear@14:    /* initialize zbuf - compression buffer */
nuclear@14:    png_ptr->zbuf_size = PNG_ZBUF_SIZE;
nuclear@14:    png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
nuclear@14:       (png_uint_32)png_ptr->zbuf_size);
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@14:    png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
nuclear@14:       1, png_doublep_NULL, png_doublep_NULL);
nuclear@14: #endif
nuclear@14: }
nuclear@14: 
nuclear@14: /* Write a few rows of image data.  If the image is interlaced,
nuclear@14:  * either you will have to write the 7 sub images, or, if you
nuclear@14:  * have called png_set_interlace_handling(), you will have to
nuclear@14:  * "write" the image seven times.
nuclear@14:  */
nuclear@14: void PNGAPI
nuclear@14: png_write_rows(png_structp png_ptr, png_bytepp row,
nuclear@14:    png_uint_32 num_rows)
nuclear@14: {
nuclear@14:    png_uint_32 i; /* row counter */
nuclear@14:    png_bytepp rp; /* row pointer */
nuclear@14: 
nuclear@14:    png_debug(1, "in png_write_rows\n");
nuclear@14: 
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14: 
nuclear@14:    /* loop through the rows */
nuclear@14:    for (i = 0, rp = row; i < num_rows; i++, rp++)
nuclear@14:    {
nuclear@14:       png_write_row(png_ptr, *rp);
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: /* Write the image.  You only need to call this function once, even
nuclear@14:  * if you are writing an interlaced image.
nuclear@14:  */
nuclear@14: void PNGAPI
nuclear@14: png_write_image(png_structp png_ptr, png_bytepp image)
nuclear@14: {
nuclear@14:    png_uint_32 i; /* row index */
nuclear@14:    int pass, num_pass; /* pass variables */
nuclear@14:    png_bytepp rp; /* points to current row */
nuclear@14: 
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14: 
nuclear@14:    png_debug(1, "in png_write_image\n");
nuclear@14: #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@14:    /* intialize interlace handling.  If image is not interlaced,
nuclear@14:       this will set pass to 1 */
nuclear@14:    num_pass = png_set_interlace_handling(png_ptr);
nuclear@14: #else
nuclear@14:    num_pass = 1;
nuclear@14: #endif
nuclear@14:    /* loop through passes */
nuclear@14:    for (pass = 0; pass < num_pass; pass++)
nuclear@14:    {
nuclear@14:       /* loop through image */
nuclear@14:       for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
nuclear@14:       {
nuclear@14:          png_write_row(png_ptr, *rp);
nuclear@14:       }
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: /* called by user to write a row of image data */
nuclear@14: void PNGAPI
nuclear@14: png_write_row(png_structp png_ptr, png_bytep row)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
nuclear@14:       png_ptr->row_number, png_ptr->pass);
nuclear@14: 
nuclear@14:    /* initialize transformations and other stuff if first time */
nuclear@14:    if (png_ptr->row_number == 0 && png_ptr->pass == 0)
nuclear@14:    {
nuclear@14:    /* make sure we wrote the header info */
nuclear@14:    if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
nuclear@14:       png_error(png_ptr,
nuclear@14:          "png_write_info was never called before png_write_row.");
nuclear@14: 
nuclear@14:    /* check for transforms that have been set but were defined out */
nuclear@14: #if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
nuclear@14:    if (png_ptr->transformations & PNG_INVERT_MONO)
nuclear@14:       png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
nuclear@14: #endif
nuclear@14: #if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
nuclear@14:    if (png_ptr->transformations & PNG_FILLER)
nuclear@14:       png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
nuclear@14: #endif
nuclear@14: #if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
nuclear@14:    if (png_ptr->transformations & PNG_PACKSWAP)
nuclear@14:       png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
nuclear@14: #endif
nuclear@14: #if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
nuclear@14:    if (png_ptr->transformations & PNG_PACK)
nuclear@14:       png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
nuclear@14: #endif
nuclear@14: #if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
nuclear@14:    if (png_ptr->transformations & PNG_SHIFT)
nuclear@14:       png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
nuclear@14: #endif
nuclear@14: #if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
nuclear@14:    if (png_ptr->transformations & PNG_BGR)
nuclear@14:       png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
nuclear@14: #endif
nuclear@14: #if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
nuclear@14:    if (png_ptr->transformations & PNG_SWAP_BYTES)
nuclear@14:       png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
nuclear@14: #endif
nuclear@14: 
nuclear@14:       png_write_start_row(png_ptr);
nuclear@14:    }
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@14:    /* if interlaced and not interested in row, return */
nuclear@14:    if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
nuclear@14:    {
nuclear@14:       switch (png_ptr->pass)
nuclear@14:       {
nuclear@14:          case 0:
nuclear@14:             if (png_ptr->row_number & 0x07)
nuclear@14:             {
nuclear@14:                png_write_finish_row(png_ptr);
nuclear@14:                return;
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          case 1:
nuclear@14:             if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
nuclear@14:             {
nuclear@14:                png_write_finish_row(png_ptr);
nuclear@14:                return;
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          case 2:
nuclear@14:             if ((png_ptr->row_number & 0x07) != 4)
nuclear@14:             {
nuclear@14:                png_write_finish_row(png_ptr);
nuclear@14:                return;
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          case 3:
nuclear@14:             if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
nuclear@14:             {
nuclear@14:                png_write_finish_row(png_ptr);
nuclear@14:                return;
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          case 4:
nuclear@14:             if ((png_ptr->row_number & 0x03) != 2)
nuclear@14:             {
nuclear@14:                png_write_finish_row(png_ptr);
nuclear@14:                return;
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          case 5:
nuclear@14:             if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
nuclear@14:             {
nuclear@14:                png_write_finish_row(png_ptr);
nuclear@14:                return;
nuclear@14:             }
nuclear@14:             break;
nuclear@14:          case 6:
nuclear@14:             if (!(png_ptr->row_number & 0x01))
nuclear@14:             {
nuclear@14:                png_write_finish_row(png_ptr);
nuclear@14:                return;
nuclear@14:             }
nuclear@14:             break;
nuclear@14:       }
nuclear@14:    }
nuclear@14: #endif
nuclear@14: 
nuclear@14:    /* set up row info for transformations */
nuclear@14:    png_ptr->row_info.color_type = png_ptr->color_type;
nuclear@14:    png_ptr->row_info.width = png_ptr->usr_width;
nuclear@14:    png_ptr->row_info.channels = png_ptr->usr_channels;
nuclear@14:    png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
nuclear@14:    png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
nuclear@14:       png_ptr->row_info.channels);
nuclear@14: 
nuclear@14:    png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
nuclear@14:       png_ptr->row_info.width);
nuclear@14: 
nuclear@14:    png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
nuclear@14:    png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
nuclear@14:    png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
nuclear@14:    png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
nuclear@14:    png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
nuclear@14:    png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
nuclear@14: 
nuclear@14:    /* Copy user's row into buffer, leaving room for filter byte. */
nuclear@14:    png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
nuclear@14:       png_ptr->row_info.rowbytes);
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_INTERLACING_SUPPORTED)
nuclear@14:    /* handle interlacing */
nuclear@14:    if (png_ptr->interlaced && png_ptr->pass < 6 &&
nuclear@14:       (png_ptr->transformations & PNG_INTERLACE))
nuclear@14:    {
nuclear@14:       png_do_write_interlace(&(png_ptr->row_info),
nuclear@14:          png_ptr->row_buf + 1, png_ptr->pass);
nuclear@14:       /* this should always get caught above, but still ... */
nuclear@14:       if (!(png_ptr->row_info.width))
nuclear@14:       {
nuclear@14:          png_write_finish_row(png_ptr);
nuclear@14:          return;
nuclear@14:       }
nuclear@14:    }
nuclear@14: #endif
nuclear@14: 
nuclear@14:    /* handle other transformations */
nuclear@14:    if (png_ptr->transformations)
nuclear@14:       png_do_write_transformations(png_ptr);
nuclear@14: 
nuclear@14: #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@14:    /* Write filter_method 64 (intrapixel differencing) only if
nuclear@14:     * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
nuclear@14:     * 2. Libpng did not write a PNG signature (this filter_method is only
nuclear@14:     *    used in PNG datastreams that are embedded in MNG datastreams) and
nuclear@14:     * 3. The application called png_permit_mng_features with a mask that
nuclear@14:     *    included PNG_FLAG_MNG_FILTER_64 and
nuclear@14:     * 4. The filter_method is 64 and
nuclear@14:     * 5. The color_type is RGB or RGBA
nuclear@14:     */
nuclear@14:    if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@14:       (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@14:    {
nuclear@14:       /* Intrapixel differencing */
nuclear@14:       png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
nuclear@14:    }
nuclear@14: #endif
nuclear@14: 
nuclear@14:    /* Find a filter if necessary, filter the row and write it out. */
nuclear@14:    png_write_find_filter(png_ptr, &(png_ptr->row_info));
nuclear@14: 
nuclear@14:    if (png_ptr->write_row_fn != NULL)
nuclear@14:       (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
nuclear@14: }
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_FLUSH_SUPPORTED)
nuclear@14: /* Set the automatic flush interval or 0 to turn flushing off */
nuclear@14: void PNGAPI
nuclear@14: png_set_flush(png_structp png_ptr, int nrows)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_set_flush\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
nuclear@14: }
nuclear@14: 
nuclear@14: /* flush the current output buffers now */
nuclear@14: void PNGAPI
nuclear@14: png_write_flush(png_structp png_ptr)
nuclear@14: {
nuclear@14:    int wrote_IDAT;
nuclear@14: 
nuclear@14:    png_debug(1, "in png_write_flush\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    /* We have already written out all of the data */
nuclear@14:    if (png_ptr->row_number >= png_ptr->num_rows)
nuclear@14:      return;
nuclear@14: 
nuclear@14:    do
nuclear@14:    {
nuclear@14:       int ret;
nuclear@14: 
nuclear@14:       /* compress the data */
nuclear@14:       ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
nuclear@14:       wrote_IDAT = 0;
nuclear@14: 
nuclear@14:       /* check for compression errors */
nuclear@14:       if (ret != Z_OK)
nuclear@14:       {
nuclear@14:          if (png_ptr->zstream.msg != NULL)
nuclear@14:             png_error(png_ptr, png_ptr->zstream.msg);
nuclear@14:          else
nuclear@14:             png_error(png_ptr, "zlib error");
nuclear@14:       }
nuclear@14: 
nuclear@14:       if (!(png_ptr->zstream.avail_out))
nuclear@14:       {
nuclear@14:          /* write the IDAT and reset the zlib output buffer */
nuclear@14:          png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@14:                         png_ptr->zbuf_size);
nuclear@14:          png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14:          png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14:          wrote_IDAT = 1;
nuclear@14:       }
nuclear@14:    } while(wrote_IDAT == 1);
nuclear@14: 
nuclear@14:    /* If there is any data left to be output, write it into a new IDAT */
nuclear@14:    if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
nuclear@14:    {
nuclear@14:       /* write the IDAT and reset the zlib output buffer */
nuclear@14:       png_write_IDAT(png_ptr, png_ptr->zbuf,
nuclear@14:                      png_ptr->zbuf_size - png_ptr->zstream.avail_out);
nuclear@14:       png_ptr->zstream.next_out = png_ptr->zbuf;
nuclear@14:       png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
nuclear@14:    }
nuclear@14:    png_ptr->flush_rows = 0;
nuclear@14:    png_flush(png_ptr);
nuclear@14: }
nuclear@14: #endif /* PNG_WRITE_FLUSH_SUPPORTED */
nuclear@14: 
nuclear@14: /* free all memory used by the write */
nuclear@14: void PNGAPI
nuclear@14: png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
nuclear@14: {
nuclear@14:    png_structp png_ptr = NULL;
nuclear@14:    png_infop info_ptr = NULL;
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    png_free_ptr free_fn = NULL;
nuclear@14:    png_voidp mem_ptr = NULL;
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_debug(1, "in png_destroy_write_struct\n");
nuclear@14:    if (png_ptr_ptr != NULL)
nuclear@14:    {
nuclear@14:       png_ptr = *png_ptr_ptr;
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:       free_fn = png_ptr->free_fn;
nuclear@14:       mem_ptr = png_ptr->mem_ptr;
nuclear@14: #endif
nuclear@14:    }
nuclear@14: 
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    if (png_ptr != NULL)
nuclear@14:    {
nuclear@14:       free_fn = png_ptr->free_fn;
nuclear@14:       mem_ptr = png_ptr->mem_ptr;
nuclear@14:    }
nuclear@14: #endif
nuclear@14: 
nuclear@14:    if (info_ptr_ptr != NULL)
nuclear@14:       info_ptr = *info_ptr_ptr;
nuclear@14: 
nuclear@14:    if (info_ptr != NULL)
nuclear@14:    {
nuclear@14:       if (png_ptr != NULL)
nuclear@14:       {
nuclear@14:         png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
nuclear@14: 
nuclear@14: #if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
nuclear@14:         if (png_ptr->num_chunk_list)
nuclear@14:         {
nuclear@14:            png_free(png_ptr, png_ptr->chunk_list);
nuclear@14:            png_ptr->chunk_list=NULL;
nuclear@14:            png_ptr->num_chunk_list = 0;
nuclear@14:         }
nuclear@14: #endif
nuclear@14:       }
nuclear@14: 
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:       png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
nuclear@14:          (png_voidp)mem_ptr);
nuclear@14: #else
nuclear@14:       png_destroy_struct((png_voidp)info_ptr);
nuclear@14: #endif
nuclear@14:       *info_ptr_ptr = NULL;
nuclear@14:    }
nuclear@14: 
nuclear@14:    if (png_ptr != NULL)
nuclear@14:    {
nuclear@14:       png_write_destroy(png_ptr);
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:       png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
nuclear@14:          (png_voidp)mem_ptr);
nuclear@14: #else
nuclear@14:       png_destroy_struct((png_voidp)png_ptr);
nuclear@14: #endif
nuclear@14:       *png_ptr_ptr = NULL;
nuclear@14:    }
nuclear@14: }
nuclear@14: 
nuclear@14: 
nuclear@14: /* Free any memory used in png_ptr struct (old method) */
nuclear@14: void /* PRIVATE */
nuclear@14: png_write_destroy(png_structp png_ptr)
nuclear@14: {
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14:    jmp_buf tmp_jmp; /* save jump buffer */
nuclear@14: #endif
nuclear@14:    png_error_ptr error_fn;
nuclear@14:    png_error_ptr warning_fn;
nuclear@14:    png_voidp error_ptr;
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    png_free_ptr free_fn;
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_debug(1, "in png_write_destroy\n");
nuclear@14:    /* free any memory zlib uses */
nuclear@14:    deflateEnd(&png_ptr->zstream);
nuclear@14: 
nuclear@14:    /* free our memory.  png_free checks NULL for us. */
nuclear@14:    png_free(png_ptr, png_ptr->zbuf);
nuclear@14:    png_free(png_ptr, png_ptr->row_buf);
nuclear@14: #ifndef PNG_NO_WRITE_FILTER
nuclear@14:    png_free(png_ptr, png_ptr->prev_row);
nuclear@14:    png_free(png_ptr, png_ptr->sub_row);
nuclear@14:    png_free(png_ptr, png_ptr->up_row);
nuclear@14:    png_free(png_ptr, png_ptr->avg_row);
nuclear@14:    png_free(png_ptr, png_ptr->paeth_row);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_TIME_RFC1123_SUPPORTED)
nuclear@14:    png_free(png_ptr, png_ptr->time_buffer);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
nuclear@14:    png_free(png_ptr, png_ptr->prev_filters);
nuclear@14:    png_free(png_ptr, png_ptr->filter_weights);
nuclear@14:    png_free(png_ptr, png_ptr->inv_filter_weights);
nuclear@14:    png_free(png_ptr, png_ptr->filter_costs);
nuclear@14:    png_free(png_ptr, png_ptr->inv_filter_costs);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14:    /* reset structure */
nuclear@14:    png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
nuclear@14: #endif
nuclear@14: 
nuclear@14:    error_fn = png_ptr->error_fn;
nuclear@14:    warning_fn = png_ptr->warning_fn;
nuclear@14:    error_ptr = png_ptr->error_ptr;
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    free_fn = png_ptr->free_fn;
nuclear@14: #endif
nuclear@14: 
nuclear@14:    png_memset(png_ptr, 0, png_sizeof(png_struct));
nuclear@14: 
nuclear@14:    png_ptr->error_fn = error_fn;
nuclear@14:    png_ptr->warning_fn = warning_fn;
nuclear@14:    png_ptr->error_ptr = error_ptr;
nuclear@14: #ifdef PNG_USER_MEM_SUPPORTED
nuclear@14:    png_ptr->free_fn = free_fn;
nuclear@14: #endif
nuclear@14: 
nuclear@14: #ifdef PNG_SETJMP_SUPPORTED
nuclear@14:    png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
nuclear@14: #endif
nuclear@14: }
nuclear@14: 
nuclear@14: /* Allow the application to select one or more row filters to use. */
nuclear@14: void PNGAPI
nuclear@14: png_set_filter(png_structp png_ptr, int method, int filters)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_set_filter\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14: #if defined(PNG_MNG_FEATURES_SUPPORTED)
nuclear@14:    if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
nuclear@14:       (method == PNG_INTRAPIXEL_DIFFERENCING))
nuclear@14:          method = PNG_FILTER_TYPE_BASE;
nuclear@14: #endif
nuclear@14:    if (method == PNG_FILTER_TYPE_BASE)
nuclear@14:    {
nuclear@14:       switch (filters & (PNG_ALL_FILTERS | 0x07))
nuclear@14:       {
nuclear@14: #ifndef PNG_NO_WRITE_FILTER
nuclear@14:          case 5:
nuclear@14:          case 6:
nuclear@14:          case 7: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@14: #endif /* PNG_NO_WRITE_FILTER */
nuclear@14:          case PNG_FILTER_VALUE_NONE:
nuclear@14:               png_ptr->do_filter=PNG_FILTER_NONE; break;
nuclear@14: #ifndef PNG_NO_WRITE_FILTER
nuclear@14:          case PNG_FILTER_VALUE_SUB:
nuclear@14:               png_ptr->do_filter=PNG_FILTER_SUB; break;
nuclear@14:          case PNG_FILTER_VALUE_UP:
nuclear@14:               png_ptr->do_filter=PNG_FILTER_UP; break;
nuclear@14:          case PNG_FILTER_VALUE_AVG:
nuclear@14:               png_ptr->do_filter=PNG_FILTER_AVG; break;
nuclear@14:          case PNG_FILTER_VALUE_PAETH:
nuclear@14:               png_ptr->do_filter=PNG_FILTER_PAETH; break;
nuclear@14:          default: png_ptr->do_filter = (png_byte)filters; break;
nuclear@14: #else
nuclear@14:          default: png_warning(png_ptr, "Unknown row filter for method 0");
nuclear@14: #endif /* PNG_NO_WRITE_FILTER */
nuclear@14:       }
nuclear@14: 
nuclear@14:       /* If we have allocated the row_buf, this means we have already started
nuclear@14:        * with the image and we should have allocated all of the filter buffers
nuclear@14:        * that have been selected.  If prev_row isn't already allocated, then
nuclear@14:        * it is too late to start using the filters that need it, since we
nuclear@14:        * will be missing the data in the previous row.  If an application
nuclear@14:        * wants to start and stop using particular filters during compression,
nuclear@14:        * it should start out with all of the filters, and then add and
nuclear@14:        * remove them after the start of compression.
nuclear@14:        */
nuclear@14:       if (png_ptr->row_buf != NULL)
nuclear@14:       {
nuclear@14: #ifndef PNG_NO_WRITE_FILTER
nuclear@14:          if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
nuclear@14:          {
nuclear@14:             png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
nuclear@14:               (png_ptr->rowbytes + 1));
nuclear@14:             png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
nuclear@14:          }
nuclear@14: 
nuclear@14:          if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
nuclear@14:          {
nuclear@14:             if (png_ptr->prev_row == NULL)
nuclear@14:             {
nuclear@14:                png_warning(png_ptr, "Can't add Up filter after starting");
nuclear@14:                png_ptr->do_filter &= ~PNG_FILTER_UP;
nuclear@14:             }
nuclear@14:             else
nuclear@14:             {
nuclear@14:                png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
nuclear@14:                   (png_ptr->rowbytes + 1));
nuclear@14:                png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
nuclear@14:             }
nuclear@14:          }
nuclear@14: 
nuclear@14:          if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
nuclear@14:          {
nuclear@14:             if (png_ptr->prev_row == NULL)
nuclear@14:             {
nuclear@14:                png_warning(png_ptr, "Can't add Average filter after starting");
nuclear@14:                png_ptr->do_filter &= ~PNG_FILTER_AVG;
nuclear@14:             }
nuclear@14:             else
nuclear@14:             {
nuclear@14:                png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
nuclear@14:                   (png_ptr->rowbytes + 1));
nuclear@14:                png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
nuclear@14:             }
nuclear@14:          }
nuclear@14: 
nuclear@14:          if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
nuclear@14:              png_ptr->paeth_row == NULL)
nuclear@14:          {
nuclear@14:             if (png_ptr->prev_row == NULL)
nuclear@14:             {
nuclear@14:                png_warning(png_ptr, "Can't add Paeth filter after starting");
nuclear@14:                png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
nuclear@14:             }
nuclear@14:             else
nuclear@14:             {
nuclear@14:                png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
nuclear@14:                   (png_ptr->rowbytes + 1));
nuclear@14:                png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
nuclear@14:             }
nuclear@14:          }
nuclear@14: 
nuclear@14:          if (png_ptr->do_filter == PNG_NO_FILTERS)
nuclear@14: #endif /* PNG_NO_WRITE_FILTER */
nuclear@14:             png_ptr->do_filter = PNG_FILTER_NONE;
nuclear@14:       }
nuclear@14:    }
nuclear@14:    else
nuclear@14:       png_error(png_ptr, "Unknown custom filter method");
nuclear@14: }
nuclear@14: 
nuclear@14: /* This allows us to influence the way in which libpng chooses the "best"
nuclear@14:  * filter for the current scanline.  While the "minimum-sum-of-absolute-
nuclear@14:  * differences metric is relatively fast and effective, there is some
nuclear@14:  * question as to whether it can be improved upon by trying to keep the
nuclear@14:  * filtered data going to zlib more consistent, hopefully resulting in
nuclear@14:  * better compression.
nuclear@14:  */
nuclear@14: #if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)      /* GRR 970116 */
nuclear@14: void PNGAPI
nuclear@14: png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
nuclear@14:    int num_weights, png_doublep filter_weights,
nuclear@14:    png_doublep filter_costs)
nuclear@14: {
nuclear@14:    int i;
nuclear@14: 
nuclear@14:    png_debug(1, "in png_set_filter_heuristics\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
nuclear@14:    {
nuclear@14:       png_warning(png_ptr, "Unknown filter heuristic method");
nuclear@14:       return;
nuclear@14:    }
nuclear@14: 
nuclear@14:    if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
nuclear@14:    {
nuclear@14:       heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
nuclear@14:    }
nuclear@14: 
nuclear@14:    if (num_weights < 0 || filter_weights == NULL ||
nuclear@14:       heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
nuclear@14:    {
nuclear@14:       num_weights = 0;
nuclear@14:    }
nuclear@14: 
nuclear@14:    png_ptr->num_prev_filters = (png_byte)num_weights;
nuclear@14:    png_ptr->heuristic_method = (png_byte)heuristic_method;
nuclear@14: 
nuclear@14:    if (num_weights > 0)
nuclear@14:    {
nuclear@14:       if (png_ptr->prev_filters == NULL)
nuclear@14:       {
nuclear@14:          png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
nuclear@14:             (png_uint_32)(png_sizeof(png_byte) * num_weights));
nuclear@14: 
nuclear@14:          /* To make sure that the weighting starts out fairly */
nuclear@14:          for (i = 0; i < num_weights; i++)
nuclear@14:          {
nuclear@14:             png_ptr->prev_filters[i] = 255;
nuclear@14:          }
nuclear@14:       }
nuclear@14: 
nuclear@14:       if (png_ptr->filter_weights == NULL)
nuclear@14:       {
nuclear@14:          png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@14:             (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@14: 
nuclear@14:          png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
nuclear@14:             (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
nuclear@14:          for (i = 0; i < num_weights; i++)
nuclear@14:          {
nuclear@14:             png_ptr->inv_filter_weights[i] =
nuclear@14:             png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@14:          }
nuclear@14:       }
nuclear@14: 
nuclear@14:       for (i = 0; i < num_weights; i++)
nuclear@14:       {
nuclear@14:          if (filter_weights[i] < 0.0)
nuclear@14:          {
nuclear@14:             png_ptr->inv_filter_weights[i] =
nuclear@14:             png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
nuclear@14:          }
nuclear@14:          else
nuclear@14:          {
nuclear@14:             png_ptr->inv_filter_weights[i] =
nuclear@14:                (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
nuclear@14:             png_ptr->filter_weights[i] =
nuclear@14:                (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
nuclear@14:          }
nuclear@14:       }
nuclear@14:    }
nuclear@14: 
nuclear@14:    /* If, in the future, there are other filter methods, this would
nuclear@14:     * need to be based on png_ptr->filter.
nuclear@14:     */
nuclear@14:    if (png_ptr->filter_costs == NULL)
nuclear@14:    {
nuclear@14:       png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@14:          (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@14: 
nuclear@14:       png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
nuclear@14:          (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
nuclear@14: 
nuclear@14:       for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@14:       {
nuclear@14:          png_ptr->inv_filter_costs[i] =
nuclear@14:          png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@14:       }
nuclear@14:    }
nuclear@14: 
nuclear@14:    /* Here is where we set the relative costs of the different filters.  We
nuclear@14:     * should take the desired compression level into account when setting
nuclear@14:     * the costs, so that Paeth, for instance, has a high relative cost at low
nuclear@14:     * compression levels, while it has a lower relative cost at higher
nuclear@14:     * compression settings.  The filter types are in order of increasing
nuclear@14:     * relative cost, so it would be possible to do this with an algorithm.
nuclear@14:     */
nuclear@14:    for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
nuclear@14:    {
nuclear@14:       if (filter_costs == NULL || filter_costs[i] < 0.0)
nuclear@14:       {
nuclear@14:          png_ptr->inv_filter_costs[i] =
nuclear@14:          png_ptr->filter_costs[i] = PNG_COST_FACTOR;
nuclear@14:       }
nuclear@14:       else if (filter_costs[i] >= 1.0)
nuclear@14:       {
nuclear@14:          png_ptr->inv_filter_costs[i] =
nuclear@14:             (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
nuclear@14:          png_ptr->filter_costs[i] =
nuclear@14:             (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
nuclear@14:       }
nuclear@14:    }
nuclear@14: }
nuclear@14: #endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_set_compression_level(png_structp png_ptr, int level)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_set_compression_level\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
nuclear@14:    png_ptr->zlib_level = level;
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_set_compression_mem_level(png_structp png_ptr, int mem_level)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_set_compression_mem_level\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
nuclear@14:    png_ptr->zlib_mem_level = mem_level;
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_set_compression_strategy(png_structp png_ptr, int strategy)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_set_compression_strategy\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
nuclear@14:    png_ptr->zlib_strategy = strategy;
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_set_compression_window_bits(png_structp png_ptr, int window_bits)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    if (window_bits > 15)
nuclear@14:       png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
nuclear@14:    else if (window_bits < 8)
nuclear@14:       png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
nuclear@14: #ifndef WBITS_8_OK
nuclear@14:    /* avoid libpng bug with 256-byte windows */
nuclear@14:    if (window_bits == 8)
nuclear@14:      {
nuclear@14:        png_warning(png_ptr, "Compression window is being reset to 512");
nuclear@14:        window_bits=9;
nuclear@14:      }
nuclear@14: #endif
nuclear@14:    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
nuclear@14:    png_ptr->zlib_window_bits = window_bits;
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_set_compression_method(png_structp png_ptr, int method)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_set_compression_method\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    if (method != 8)
nuclear@14:       png_warning(png_ptr, "Only compression method 8 is supported by PNG");
nuclear@14:    png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
nuclear@14:    png_ptr->zlib_method = method;
nuclear@14: }
nuclear@14: 
nuclear@14: void PNGAPI
nuclear@14: png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    png_ptr->write_row_fn = write_row_fn;
nuclear@14: }
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
nuclear@14: void PNGAPI
nuclear@14: png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
nuclear@14:    write_user_transform_fn)
nuclear@14: {
nuclear@14:    png_debug(1, "in png_set_write_user_transform_fn\n");
nuclear@14:    if (png_ptr == NULL)
nuclear@14:       return;
nuclear@14:    png_ptr->transformations |= PNG_USER_TRANSFORM;
nuclear@14:    png_ptr->write_user_transform_fn = write_user_transform_fn;
nuclear@14: }
nuclear@14: #endif
nuclear@14: 
nuclear@14: 
nuclear@14: #if defined(PNG_INFO_IMAGE_SUPPORTED)
nuclear@14: void PNGAPI
nuclear@14: png_write_png(png_structp png_ptr, png_infop info_ptr,
nuclear@14:               int transforms, voidp params)
nuclear@14: {
nuclear@14:    if (png_ptr == NULL || info_ptr == NULL)
nuclear@14:       return;
nuclear@14: #if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
nuclear@14:    /* invert the alpha channel from opacity to transparency */
nuclear@14:    if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
nuclear@14:        png_set_invert_alpha(png_ptr);
nuclear@14: #endif
nuclear@14: 
nuclear@14:    /* Write the file header information. */
nuclear@14:    png_write_info(png_ptr, info_ptr);
nuclear@14: 
nuclear@14:    /* ------ these transformations don't touch the info structure ------- */
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_INVERT_SUPPORTED)
nuclear@14:    /* invert monochrome pixels */
nuclear@14:    if (transforms & PNG_TRANSFORM_INVERT_MONO)
nuclear@14:        png_set_invert_mono(png_ptr);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_SHIFT_SUPPORTED)
nuclear@14:    /* Shift the pixels up to a legal bit depth and fill in
nuclear@14:     * as appropriate to correctly scale the image.
nuclear@14:     */
nuclear@14:    if ((transforms & PNG_TRANSFORM_SHIFT)
nuclear@14:                && (info_ptr->valid & PNG_INFO_sBIT))
nuclear@14:        png_set_shift(png_ptr, &info_ptr->sig_bit);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_PACK_SUPPORTED)
nuclear@14:    /* pack pixels into bytes */
nuclear@14:    if (transforms & PNG_TRANSFORM_PACKING)
nuclear@14:        png_set_packing(png_ptr);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
nuclear@14:    /* swap location of alpha bytes from ARGB to RGBA */
nuclear@14:    if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
nuclear@14:        png_set_swap_alpha(png_ptr);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_FILLER_SUPPORTED)
nuclear@14:    /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
nuclear@14:     * RGB (4 channels -> 3 channels). The second parameter is not used.
nuclear@14:     */
nuclear@14:    if (transforms & PNG_TRANSFORM_STRIP_FILLER)
nuclear@14:        png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_BGR_SUPPORTED)
nuclear@14:    /* flip BGR pixels to RGB */
nuclear@14:    if (transforms & PNG_TRANSFORM_BGR)
nuclear@14:        png_set_bgr(png_ptr);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_SWAP_SUPPORTED)
nuclear@14:    /* swap bytes of 16-bit files to most significant byte first */
nuclear@14:    if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
nuclear@14:        png_set_swap(png_ptr);
nuclear@14: #endif
nuclear@14: 
nuclear@14: #if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
nuclear@14:    /* swap bits of 1, 2, 4 bit packed pixel formats */
nuclear@14:    if (transforms & PNG_TRANSFORM_PACKSWAP)
nuclear@14:        png_set_packswap(png_ptr);
nuclear@14: #endif
nuclear@14: 
nuclear@14:    /* ----------------------- end of transformations ------------------- */
nuclear@14: 
nuclear@14:    /* write the bits */
nuclear@14:    if (info_ptr->valid & PNG_INFO_IDAT)
nuclear@14:        png_write_image(png_ptr, info_ptr->row_pointers);
nuclear@14: 
nuclear@14:    /* It is REQUIRED to call this to finish writing the rest of the file */
nuclear@14:    png_write_end(png_ptr, info_ptr);
nuclear@14: 
nuclear@14:    transforms = transforms; /* quiet compiler warnings */
nuclear@14:    params = params;
nuclear@14: }
nuclear@14: #endif
nuclear@14: #endif /* PNG_WRITE_SUPPORTED */