FCL/sf/adapt/qemu: comparison symbian-qemu-0.9.1-12/libpng-1.2.32/pngwrite.c

equal deleted inserted replaced

-:ffa851df0825
+:2fb8b9db1c86
+/* pngwrite.c - general routines to write a PNG file
+*
+* Last changed in libpng 1.2.31 [August 19, 2008]
+* For conditions of distribution and use, see copyright notice in png.h
+* Copyright (c) 1998-2008 Glenn Randers-Pehrson
+* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
+* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+*/
+/* get internal access to png.h */
+#define PNG_INTERNAL
+#include "png.h"
+#ifdef PNG_WRITE_SUPPORTED
+/* Writes all the PNG information.  This is the suggested way to use the
+* library.  If you have a new chunk to add, make a function to write it,
+* and put it in the correct location here.  If you want the chunk written
+* after the image data, put it in png_write_end().  I strongly encourage
+* you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
+* the chunk, as that will keep the code from breaking if you want to just
+* write a plain PNG file.  If you have long comments, I suggest writing
+* them in png_write_end(), and compressing them.
+*/
+void PNGAPI
+png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
+{
+png_debug(1, "in png_write_info_before_PLTE\n");
+if (png_ptr == NULL || info_ptr == NULL)
+return;
+if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+{
+png_write_sig(png_ptr); /* write PNG signature */
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
+{
+png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
+png_ptr->mng_features_permitted=0;
+}
+#endif
+/* write IHDR information. */
+png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
+info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
+info_ptr->filter_type,
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
+info_ptr->interlace_type);
+#else
+0);
+#endif
+/* the rest of these check to see if the valid field has the appropriate
+flag set, and if it does, writes the chunk. */
+#if defined(PNG_WRITE_gAMA_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_gAMA)
+{
+#  ifdef PNG_FLOATING_POINT_SUPPORTED
+png_write_gAMA(png_ptr, info_ptr->gamma);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
+#  endif
+#endif
+}
+#endif
+#if defined(PNG_WRITE_sRGB_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_sRGB)
+png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
+#endif
+#if defined(PNG_WRITE_iCCP_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_iCCP)
+png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
+info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
+#endif
+#if defined(PNG_WRITE_sBIT_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_sBIT)
+png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
+#endif
+#if defined(PNG_WRITE_cHRM_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_cHRM)
+{
+#ifdef PNG_FLOATING_POINT_SUPPORTED
+png_write_cHRM(png_ptr,
+info_ptr->x_white, info_ptr->y_white,
+info_ptr->x_red, info_ptr->y_red,
+info_ptr->x_green, info_ptr->y_green,
+info_ptr->x_blue, info_ptr->y_blue);
+#else
+#  ifdef PNG_FIXED_POINT_SUPPORTED
+png_write_cHRM_fixed(png_ptr,
+info_ptr->int_x_white, info_ptr->int_y_white,
+info_ptr->int_x_red, info_ptr->int_y_red,
+info_ptr->int_x_green, info_ptr->int_y_green,
+info_ptr->int_x_blue, info_ptr->int_y_blue);
+#  endif
+#endif
+}
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+if (info_ptr->unknown_chunks_num)
+{
+png_unknown_chunk *up;
+png_debug(5, "writing extra chunks\n");
+for (up = info_ptr->unknown_chunks;
+up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+up++)
+{
+int keep=png_handle_as_unknown(png_ptr, up->name);
+if (keep != PNG_HANDLE_CHUNK_NEVER &&
+up->location && !(up->location & PNG_HAVE_PLTE) &&
+!(up->location & PNG_HAVE_IDAT) &&
+((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+{
+if (up->size == 0)
+png_warning(png_ptr, "Writing zero-length unknown chunk");
+png_write_chunk(png_ptr, up->name, up->data, up->size);
+}
+}
+}
+#endif
+png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
+}
+}
+void PNGAPI
+png_write_info(png_structp png_ptr, png_infop info_ptr)
+{
+#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
+int i;
+#endif
+png_debug(1, "in png_write_info\n");
+if (png_ptr == NULL || info_ptr == NULL)
+return;
+png_write_info_before_PLTE(png_ptr, info_ptr);
+if (info_ptr->valid & PNG_INFO_PLTE)
+png_write_PLTE(png_ptr, info_ptr->palette,
+(png_uint_32)info_ptr->num_palette);
+else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+png_error(png_ptr, "Valid palette required for paletted images");
+#if defined(PNG_WRITE_tRNS_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_tRNS)
+{
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+/* invert the alpha channel (in tRNS) */
+if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
+info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
+{
+int j;
+for (j=0; j<(int)info_ptr->num_trans; j++)
+info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
+}
+#endif
+png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
+info_ptr->num_trans, info_ptr->color_type);
+}
+#endif
+#if defined(PNG_WRITE_bKGD_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_bKGD)
+png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
+#endif
+#if defined(PNG_WRITE_hIST_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_hIST)
+png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
+#endif
+#if defined(PNG_WRITE_oFFs_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_oFFs)
+png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
+info_ptr->offset_unit_type);
+#endif
+#if defined(PNG_WRITE_pCAL_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_pCAL)
+png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
+info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
+info_ptr->pcal_units, info_ptr->pcal_params);
+#endif
+#if defined(PNG_WRITE_sCAL_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_sCAL)
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+png_write_sCAL(png_ptr, (int)info_ptr->scal_unit,
+info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
+#else
+#ifdef PNG_FIXED_POINT_SUPPORTED
+png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
+info_ptr->scal_s_width, info_ptr->scal_s_height);
+#else
+png_warning(png_ptr,
+"png_write_sCAL not supported; sCAL chunk not written.");
+#endif
+#endif
+#endif
+#if defined(PNG_WRITE_pHYs_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_pHYs)
+png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
+info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
+#endif
+#if defined(PNG_WRITE_tIME_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_tIME)
+{
+png_write_tIME(png_ptr, &(info_ptr->mod_time));
+png_ptr->mode |= PNG_WROTE_tIME;
+}
+#endif
+#if defined(PNG_WRITE_sPLT_SUPPORTED)
+if (info_ptr->valid & PNG_INFO_sPLT)
+for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
+#endif
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
+/* Check to see if we need to write text chunks */
+for (i = 0; i < info_ptr->num_text; i++)
+{
+png_debug2(2, "Writing header text chunk %d, type %d\n", i,
+info_ptr->text[i].compression);
+/* an internationalized chunk? */
+if (info_ptr->text[i].compression > 0)
+{
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+/* write international chunk */
+png_write_iTXt(png_ptr,
+info_ptr->text[i].compression,
+info_ptr->text[i].key,
+info_ptr->text[i].lang,
+info_ptr->text[i].lang_key,
+info_ptr->text[i].text);
+#else
+png_warning(png_ptr, "Unable to write international text");
+#endif
+/* Mark this chunk as written */
+info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+}
+/* If we want a compressed text chunk */
+else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
+{
+#if defined(PNG_WRITE_zTXt_SUPPORTED)
+/* write compressed chunk */
+png_write_zTXt(png_ptr, info_ptr->text[i].key,
+info_ptr->text[i].text, 0,
+info_ptr->text[i].compression);
+#else
+png_warning(png_ptr, "Unable to write compressed text");
+#endif
+/* Mark this chunk as written */
+info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
+}
+else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
+{
+#if defined(PNG_WRITE_tEXt_SUPPORTED)
+/* write uncompressed chunk */
+png_write_tEXt(png_ptr, info_ptr->text[i].key,
+info_ptr->text[i].text,
+0);
+#else
+png_warning(png_ptr, "Unable to write uncompressed text");
+#endif
+/* Mark this chunk as written */
+info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+}
+}
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+if (info_ptr->unknown_chunks_num)
+{
+png_unknown_chunk *up;
+png_debug(5, "writing extra chunks\n");
+for (up = info_ptr->unknown_chunks;
+up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+up++)
+{
+int keep=png_handle_as_unknown(png_ptr, up->name);
+if (keep != PNG_HANDLE_CHUNK_NEVER &&
+up->location && (up->location & PNG_HAVE_PLTE) &&
+!(up->location & PNG_HAVE_IDAT) &&
+((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+{
+png_write_chunk(png_ptr, up->name, up->data, up->size);
+}
+}
+}
+#endif
+}
+/* Writes the end of the PNG file.  If you don't want to write comments or
+* time information, you can pass NULL for info.  If you already wrote these
+* in png_write_info(), do not write them again here.  If you have long
+* comments, I suggest writing them here, and compressing them.
+*/
+void PNGAPI
+png_write_end(png_structp png_ptr, png_infop info_ptr)
+{
+png_debug(1, "in png_write_end\n");
+if (png_ptr == NULL)
+return;
+if (!(png_ptr->mode & PNG_HAVE_IDAT))
+png_error(png_ptr, "No IDATs written into file");
+/* see if user wants us to write information chunks */
+if (info_ptr != NULL)
+{
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
+int i; /* local index variable */
+#endif
+#if defined(PNG_WRITE_tIME_SUPPORTED)
+/* check to see if user has supplied a time chunk */
+if ((info_ptr->valid & PNG_INFO_tIME) &&
+!(png_ptr->mode & PNG_WROTE_tIME))
+png_write_tIME(png_ptr, &(info_ptr->mod_time));
+#endif
+#if defined(PNG_WRITE_TEXT_SUPPORTED)
+/* loop through comment chunks */
+for (i = 0; i < info_ptr->num_text; i++)
+{
+png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
+info_ptr->text[i].compression);
+/* an internationalized chunk? */
+if (info_ptr->text[i].compression > 0)
+{
+#if defined(PNG_WRITE_iTXt_SUPPORTED)
+/* write international chunk */
+png_write_iTXt(png_ptr,
+info_ptr->text[i].compression,
+info_ptr->text[i].key,
+info_ptr->text[i].lang,
+info_ptr->text[i].lang_key,
+info_ptr->text[i].text);
+#else
+png_warning(png_ptr, "Unable to write international text");
+#endif
+/* Mark this chunk as written */
+info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+}
+else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
+{
+#if defined(PNG_WRITE_zTXt_SUPPORTED)
+/* write compressed chunk */
+png_write_zTXt(png_ptr, info_ptr->text[i].key,
+info_ptr->text[i].text, 0,
+info_ptr->text[i].compression);
+#else
+png_warning(png_ptr, "Unable to write compressed text");
+#endif
+/* Mark this chunk as written */
+info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
+}
+else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
+{
+#if defined(PNG_WRITE_tEXt_SUPPORTED)
+/* write uncompressed chunk */
+png_write_tEXt(png_ptr, info_ptr->text[i].key,
+info_ptr->text[i].text, 0);
+#else
+png_warning(png_ptr, "Unable to write uncompressed text");
+#endif
+/* Mark this chunk as written */
+info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
+}
+}
+#endif
+#if defined(PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED)
+if (info_ptr->unknown_chunks_num)
+{
+png_unknown_chunk *up;
+png_debug(5, "writing extra chunks\n");
+for (up = info_ptr->unknown_chunks;
+up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
+up++)
+{
+int keep=png_handle_as_unknown(png_ptr, up->name);
+if (keep != PNG_HANDLE_CHUNK_NEVER &&
+up->location && (up->location & PNG_AFTER_IDAT) &&
+((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
+(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
+{
+png_write_chunk(png_ptr, up->name, up->data, up->size);
+}
+}
+}
+#endif
+}
+png_ptr->mode |= PNG_AFTER_IDAT;
+/* write end of PNG file */
+png_write_IEND(png_ptr);
+/* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
+* and restored again in libpng-1.2.30, may cause some applications that
+* do not set png_ptr->output_flush_fn to crash.  If your application
+* experiences a problem, please try building libpng with
+* PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
+* png-mng-implement at lists.sf.net .  This kludge will be removed
+* from libpng-1.4.0.
+*/
+#if defined(PNG_WRITE_FLUSH_SUPPORTED) && \
+defined(PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED)
+png_flush(png_ptr);
+#endif
+}
+#if defined(PNG_WRITE_tIME_SUPPORTED)
+#if !defined(_WIN32_WCE)
+/* "time.h" functions are not supported on WindowsCE */
+void PNGAPI
+png_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
+{
+png_debug(1, "in png_convert_from_struct_tm\n");
+ptime->year = (png_uint_16)(1900 + ttime->tm_year);
+ptime->month = (png_byte)(ttime->tm_mon + 1);
+ptime->day = (png_byte)ttime->tm_mday;
+ptime->hour = (png_byte)ttime->tm_hour;
+ptime->minute = (png_byte)ttime->tm_min;
+ptime->second = (png_byte)ttime->tm_sec;
+}
+void PNGAPI
+png_convert_from_time_t(png_timep ptime, time_t ttime)
+{
+struct tm *tbuf;
+png_debug(1, "in png_convert_from_time_t\n");
+tbuf = gmtime(&ttime);
+png_convert_from_struct_tm(ptime, tbuf);
+}
+#endif
+#endif
+/* Initialize png_ptr structure, and allocate any memory needed */
+png_structp PNGAPI
+png_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
+png_error_ptr error_fn, png_error_ptr warn_fn)
+{
+#ifdef PNG_USER_MEM_SUPPORTED
+return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
+warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
+}
+/* Alternate initialize png_ptr structure, and allocate any memory needed */
+png_structp PNGAPI
+png_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
+png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
+png_malloc_ptr malloc_fn, png_free_ptr free_fn)
+{
+#endif /* PNG_USER_MEM_SUPPORTED */
+#ifdef PNG_SETJMP_SUPPORTED
+volatile
+#endif
+png_structp png_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
+#ifdef USE_FAR_KEYWORD
+jmp_buf jmpbuf;
+#endif
+#endif
+int i;
+png_debug(1, "in png_create_write_struct\n");
+#ifdef PNG_USER_MEM_SUPPORTED
+png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
+(png_malloc_ptr)malloc_fn, (png_voidp)mem_ptr);
+#else
+png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+#endif /* PNG_USER_MEM_SUPPORTED */
+if (png_ptr == NULL)
+return (NULL);
+/* added at libpng-1.2.6 */
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
+png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
+#ifdef USE_FAR_KEYWORD
+if (setjmp(jmpbuf))
+#else
+if (setjmp(png_ptr->jmpbuf))
+#endif
+{
+png_free(png_ptr, png_ptr->zbuf);
+png_ptr->zbuf=NULL;
+png_destroy_struct(png_ptr);
+return (NULL);
+}
+#ifdef USE_FAR_KEYWORD
+png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
+#endif
+#endif
+#ifdef PNG_USER_MEM_SUPPORTED
+png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
+#endif /* PNG_USER_MEM_SUPPORTED */
+png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
+if (user_png_ver)
+{
+i=0;
+do
+{
+if (user_png_ver[i] != png_libpng_ver[i])
+png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+} while (png_libpng_ver[i++]);
+}
+if (png_ptr->flags & PNG_FLAG_LIBRARY_MISMATCH)
+{
+/* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
+* we must recompile any applications that use any older library version.
+* For versions after libpng 1.0, we will be compatible, so we need
+* only check the first digit.
+*/
+if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
+(user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
+(user_png_ver[0] == '0' && user_png_ver[2] < '9'))
+{
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+char msg[80];
+if (user_png_ver)
+{
+png_snprintf(msg, 80,
+"Application was compiled with png.h from libpng-%.20s",
+user_png_ver);
+png_warning(png_ptr, msg);
+}
+png_snprintf(msg, 80,
+"Application  is  running with png.c from libpng-%.20s",
+png_libpng_ver);
+png_warning(png_ptr, msg);
+#endif
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+png_ptr->flags=0;
+#endif
+png_error(png_ptr,
+"Incompatible libpng version in application and library");
+}
+}
+/* initialize zbuf - compression buffer */
+png_ptr->zbuf_size = PNG_ZBUF_SIZE;
+png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+(png_uint_32)png_ptr->zbuf_size);
+png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+png_flush_ptr_NULL);
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
+1, png_doublep_NULL, png_doublep_NULL);
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
+/* Applications that neglect to set up their own setjmp() and then encounter
+a png_error() will longjmp here.  Since the jmpbuf is then meaningless we
+abort instead of returning. */
+#ifdef USE_FAR_KEYWORD
+if (setjmp(jmpbuf))
+PNG_ABORT();
+png_memcpy(png_ptr->jmpbuf, jmpbuf, png_sizeof(jmp_buf));
+#else
+if (setjmp(png_ptr->jmpbuf))
+PNG_ABORT();
+#endif
+#endif
+return (png_ptr);
+}
+/* Initialize png_ptr structure, and allocate any memory needed */
+#if defined(PNG_1_0_X) || defined(PNG_1_2_X)
+/* Deprecated. */
+#undef png_write_init
+void PNGAPI
+png_write_init(png_structp png_ptr)
+{
+/* We only come here via pre-1.0.7-compiled applications */
+png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
+}
+void PNGAPI
+png_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
+png_size_t png_struct_size, png_size_t png_info_size)
+{
+/* We only come here via pre-1.0.12-compiled applications */
+if (png_ptr == NULL) return;
+#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+if (png_sizeof(png_struct) > png_struct_size ||
+png_sizeof(png_info) > png_info_size)
+{
+char msg[80];
+png_ptr->warning_fn=NULL;
+if (user_png_ver)
+{
+png_snprintf(msg, 80,
+"Application was compiled with png.h from libpng-%.20s",
+user_png_ver);
+png_warning(png_ptr, msg);
+}
+png_snprintf(msg, 80,
+"Application  is  running with png.c from libpng-%.20s",
+png_libpng_ver);
+png_warning(png_ptr, msg);
+}
+#endif
+if (png_sizeof(png_struct) > png_struct_size)
+{
+png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+png_ptr->flags=0;
+#endif
+png_error(png_ptr,
+"The png struct allocated by the application for writing is too small.");
+}
+if (png_sizeof(png_info) > png_info_size)
+{
+png_ptr->error_fn=NULL;
+#ifdef PNG_ERROR_NUMBERS_SUPPORTED
+png_ptr->flags=0;
+#endif
+png_error(png_ptr,
+"The info struct allocated by the application for writing is too small.");
+}
+png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
+}
+#endif /* PNG_1_0_X || PNG_1_2_X */
+void PNGAPI
+png_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
+png_size_t png_struct_size)
+{
+png_structp png_ptr=*ptr_ptr;
+#ifdef PNG_SETJMP_SUPPORTED
+jmp_buf tmp_jmp; /* to save current jump buffer */
+#endif
+int i = 0;
+if (png_ptr == NULL)
+return;
+do
+{
+if (user_png_ver[i] != png_libpng_ver[i])
+{
+#ifdef PNG_LEGACY_SUPPORTED
+png_ptr->flags |= PNG_FLAG_LIBRARY_MISMATCH;
+#else
+png_ptr->warning_fn=NULL;
+png_warning(png_ptr,
+"Application uses deprecated png_write_init() and should be recompiled.");
+break;
+#endif
+}
+} while (png_libpng_ver[i++]);
+png_debug(1, "in png_write_init_3\n");
+#ifdef PNG_SETJMP_SUPPORTED
+/* save jump buffer and error functions */
+png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+#endif
+if (png_sizeof(png_struct) > png_struct_size)
+{
+png_destroy_struct(png_ptr);
+png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
+*ptr_ptr = png_ptr;
+}
+/* reset all variables to 0 */
+png_memset(png_ptr, 0, png_sizeof(png_struct));
+/* added at libpng-1.2.6 */
+#ifdef PNG_SET_USER_LIMITS_SUPPORTED
+png_ptr->user_width_max=PNG_USER_WIDTH_MAX;
+png_ptr->user_height_max=PNG_USER_HEIGHT_MAX;
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
+/* restore jump buffer */
+png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+#endif
+png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
+png_flush_ptr_NULL);
+/* initialize zbuf - compression buffer */
+png_ptr->zbuf_size = PNG_ZBUF_SIZE;
+png_ptr->zbuf = (png_bytep)png_malloc(png_ptr,
+(png_uint_32)png_ptr->zbuf_size);
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
+1, png_doublep_NULL, png_doublep_NULL);
+#endif
+}
+/* Write a few rows of image data.  If the image is interlaced,
+* either you will have to write the 7 sub images, or, if you
+* have called png_set_interlace_handling(), you will have to
+* "write" the image seven times.
+*/
+void PNGAPI
+png_write_rows(png_structp png_ptr, png_bytepp row,
+png_uint_32 num_rows)
+{
+png_uint_32 i; /* row counter */
+png_bytepp rp; /* row pointer */
+png_debug(1, "in png_write_rows\n");
+if (png_ptr == NULL)
+return;
+/* loop through the rows */
+for (i = 0, rp = row; i < num_rows; i++, rp++)
+{
+png_write_row(png_ptr, *rp);
+}
+}
+/* Write the image.  You only need to call this function once, even
+* if you are writing an interlaced image.
+*/
+void PNGAPI
+png_write_image(png_structp png_ptr, png_bytepp image)
+{
+png_uint_32 i; /* row index */
+int pass, num_pass; /* pass variables */
+png_bytepp rp; /* points to current row */
+if (png_ptr == NULL)
+return;
+png_debug(1, "in png_write_image\n");
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
+/* intialize interlace handling.  If image is not interlaced,
+this will set pass to 1 */
+num_pass = png_set_interlace_handling(png_ptr);
+#else
+num_pass = 1;
+#endif
+/* loop through passes */
+for (pass = 0; pass < num_pass; pass++)
+{
+/* loop through image */
+for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
+{
+png_write_row(png_ptr, *rp);
+}
+}
+}
+/* called by user to write a row of image data */
+void PNGAPI
+png_write_row(png_structp png_ptr, png_bytep row)
+{
+if (png_ptr == NULL)
+return;
+png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
+png_ptr->row_number, png_ptr->pass);
+/* initialize transformations and other stuff if first time */
+if (png_ptr->row_number == 0 && png_ptr->pass == 0)
+{
+/* make sure we wrote the header info */
+if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
+png_error(png_ptr,
+"png_write_info was never called before png_write_row.");
+/* check for transforms that have been set but were defined out */
+#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
+if (png_ptr->transformations & PNG_INVERT_MONO)
+png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
+if (png_ptr->transformations & PNG_FILLER)
+png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
+if (png_ptr->transformations & PNG_PACKSWAP)
+png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
+if (png_ptr->transformations & PNG_PACK)
+png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
+if (png_ptr->transformations & PNG_SHIFT)
+png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
+if (png_ptr->transformations & PNG_BGR)
+png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
+#endif
+#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
+if (png_ptr->transformations & PNG_SWAP_BYTES)
+png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
+#endif
+png_write_start_row(png_ptr);
+}
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
+/* if interlaced and not interested in row, return */
+if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
+{
+switch (png_ptr->pass)
+{
+case 0:
+if (png_ptr->row_number & 0x07)
+{
+png_write_finish_row(png_ptr);
+return;
+}
+break;
+case 1:
+if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
+{
+png_write_finish_row(png_ptr);
+return;
+}
+break;
+case 2:
+if ((png_ptr->row_number & 0x07) != 4)
+{
+png_write_finish_row(png_ptr);
+return;
+}
+break;
+case 3:
+if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
+{
+png_write_finish_row(png_ptr);
+return;
+}
+break;
+case 4:
+if ((png_ptr->row_number & 0x03) != 2)
+{
+png_write_finish_row(png_ptr);
+return;
+}
+break;
+case 5:
+if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
+{
+png_write_finish_row(png_ptr);
+return;
+}
+break;
+case 6:
+if (!(png_ptr->row_number & 0x01))
+{
+png_write_finish_row(png_ptr);
+return;
+}
+break;
+}
+}
+#endif
+/* set up row info for transformations */
+png_ptr->row_info.color_type = png_ptr->color_type;
+png_ptr->row_info.width = png_ptr->usr_width;
+png_ptr->row_info.channels = png_ptr->usr_channels;
+png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
+png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
+png_ptr->row_info.channels);
+png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
+png_ptr->row_info.width);
+png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
+png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
+png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
+png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
+png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
+png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
+/* Copy user's row into buffer, leaving room for filter byte. */
+png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
+png_ptr->row_info.rowbytes);
+#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
+/* handle interlacing */
+if (png_ptr->interlaced && png_ptr->pass < 6 &&
+(png_ptr->transformations & PNG_INTERLACE))
+{
+png_do_write_interlace(&(png_ptr->row_info),
+png_ptr->row_buf + 1, png_ptr->pass);
+/* this should always get caught above, but still ... */
+if (!(png_ptr->row_info.width))
+{
+png_write_finish_row(png_ptr);
+return;
+}
+}
+#endif
+/* handle other transformations */
+if (png_ptr->transformations)
+png_do_write_transformations(png_ptr);
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+/* Write filter_method 64 (intrapixel differencing) only if
+* 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
+* 2. Libpng did not write a PNG signature (this filter_method is only
+*    used in PNG datastreams that are embedded in MNG datastreams) and
+* 3. The application called png_permit_mng_features with a mask that
+*    included PNG_FLAG_MNG_FILTER_64 and
+* 4. The filter_method is 64 and
+* 5. The color_type is RGB or RGBA
+*/
+if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+(png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
+{
+/* Intrapixel differencing */
+png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
+}
+#endif
+/* Find a filter if necessary, filter the row and write it out. */
+png_write_find_filter(png_ptr, &(png_ptr->row_info));
+if (png_ptr->write_row_fn != NULL)
+(*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
+}
+#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+/* Set the automatic flush interval or 0 to turn flushing off */
+void PNGAPI
+png_set_flush(png_structp png_ptr, int nrows)
+{
+png_debug(1, "in png_set_flush\n");
+if (png_ptr == NULL)
+return;
+png_ptr->flush_dist = (nrows < 0 ? 0 : nrows);
+}
+/* flush the current output buffers now */
+void PNGAPI
+png_write_flush(png_structp png_ptr)
+{
+int wrote_IDAT;
+png_debug(1, "in png_write_flush\n");
+if (png_ptr == NULL)
+return;
+/* We have already written out all of the data */
+if (png_ptr->row_number >= png_ptr->num_rows)
+return;
+do
+{
+int ret;
+/* compress the data */
+ret = deflate(&png_ptr->zstream, Z_SYNC_FLUSH);
+wrote_IDAT = 0;
+/* check for compression errors */
+if (ret != Z_OK)
+{
+if (png_ptr->zstream.msg != NULL)
+png_error(png_ptr, png_ptr->zstream.msg);
+else
+png_error(png_ptr, "zlib error");
+}
+if (!(png_ptr->zstream.avail_out))
+{
+/* write the IDAT and reset the zlib output buffer */
+png_write_IDAT(png_ptr, png_ptr->zbuf,
+png_ptr->zbuf_size);
+png_ptr->zstream.next_out = png_ptr->zbuf;
+png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+wrote_IDAT = 1;
+}
+} while(wrote_IDAT == 1);
+/* If there is any data left to be output, write it into a new IDAT */
+if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
+{
+/* write the IDAT and reset the zlib output buffer */
+png_write_IDAT(png_ptr, png_ptr->zbuf,
+png_ptr->zbuf_size - png_ptr->zstream.avail_out);
+png_ptr->zstream.next_out = png_ptr->zbuf;
+png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
+}
+png_ptr->flush_rows = 0;
+png_flush(png_ptr);
+}
+#endif /* PNG_WRITE_FLUSH_SUPPORTED */
+/* free all memory used by the write */
+void PNGAPI
+png_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
+{
+png_structp png_ptr = NULL;
+png_infop info_ptr = NULL;
+#ifdef PNG_USER_MEM_SUPPORTED
+png_free_ptr free_fn = NULL;
+png_voidp mem_ptr = NULL;
+#endif
+png_debug(1, "in png_destroy_write_struct\n");
+if (png_ptr_ptr != NULL)
+{
+png_ptr = *png_ptr_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+free_fn = png_ptr->free_fn;
+mem_ptr = png_ptr->mem_ptr;
+#endif
+}
+#ifdef PNG_USER_MEM_SUPPORTED
+if (png_ptr != NULL)
+{
+free_fn = png_ptr->free_fn;
+mem_ptr = png_ptr->mem_ptr;
+}
+#endif
+if (info_ptr_ptr != NULL)
+info_ptr = *info_ptr_ptr;
+if (info_ptr != NULL)
+{
+if (png_ptr != NULL)
+{
+png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
+#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
+if (png_ptr->num_chunk_list)
+{
+png_free(png_ptr, png_ptr->chunk_list);
+png_ptr->chunk_list=NULL;
+png_ptr->num_chunk_list = 0;
+}
+#endif
+}
+#ifdef PNG_USER_MEM_SUPPORTED
+png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
+(png_voidp)mem_ptr);
+#else
+png_destroy_struct((png_voidp)info_ptr);
+#endif
+*info_ptr_ptr = NULL;
+}
+if (png_ptr != NULL)
+{
+png_write_destroy(png_ptr);
+#ifdef PNG_USER_MEM_SUPPORTED
+png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
+(png_voidp)mem_ptr);
+#else
+png_destroy_struct((png_voidp)png_ptr);
+#endif
+*png_ptr_ptr = NULL;
+}
+}
+/* Free any memory used in png_ptr struct (old method) */
+void /* PRIVATE */
+png_write_destroy(png_structp png_ptr)
+{
+#ifdef PNG_SETJMP_SUPPORTED
+jmp_buf tmp_jmp; /* save jump buffer */
+#endif
+png_error_ptr error_fn;
+png_error_ptr warning_fn;
+png_voidp error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+png_free_ptr free_fn;
+#endif
+png_debug(1, "in png_write_destroy\n");
+/* free any memory zlib uses */
+deflateEnd(&png_ptr->zstream);
+/* free our memory.  png_free checks NULL for us. */
+png_free(png_ptr, png_ptr->zbuf);
+png_free(png_ptr, png_ptr->row_buf);
+#ifndef PNG_NO_WRITE_FILTER
+png_free(png_ptr, png_ptr->prev_row);
+png_free(png_ptr, png_ptr->sub_row);
+png_free(png_ptr, png_ptr->up_row);
+png_free(png_ptr, png_ptr->avg_row);
+png_free(png_ptr, png_ptr->paeth_row);
+#endif
+#if defined(PNG_TIME_RFC1123_SUPPORTED)
+png_free(png_ptr, png_ptr->time_buffer);
+#endif
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+png_free(png_ptr, png_ptr->prev_filters);
+png_free(png_ptr, png_ptr->filter_weights);
+png_free(png_ptr, png_ptr->inv_filter_weights);
+png_free(png_ptr, png_ptr->filter_costs);
+png_free(png_ptr, png_ptr->inv_filter_costs);
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
+/* reset structure */
+png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof(jmp_buf));
+#endif
+error_fn = png_ptr->error_fn;
+warning_fn = png_ptr->warning_fn;
+error_ptr = png_ptr->error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+free_fn = png_ptr->free_fn;
+#endif
+png_memset(png_ptr, 0, png_sizeof(png_struct));
+png_ptr->error_fn = error_fn;
+png_ptr->warning_fn = warning_fn;
+png_ptr->error_ptr = error_ptr;
+#ifdef PNG_USER_MEM_SUPPORTED
+png_ptr->free_fn = free_fn;
+#endif
+#ifdef PNG_SETJMP_SUPPORTED
+png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof(jmp_buf));
+#endif
+}
+/* Allow the application to select one or more row filters to use. */
+void PNGAPI
+png_set_filter(png_structp png_ptr, int method, int filters)
+{
+png_debug(1, "in png_set_filter\n");
+if (png_ptr == NULL)
+return;
+#if defined(PNG_MNG_FEATURES_SUPPORTED)
+if ((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
+(method == PNG_INTRAPIXEL_DIFFERENCING))
+method = PNG_FILTER_TYPE_BASE;
+#endif
+if (method == PNG_FILTER_TYPE_BASE)
+{
+switch (filters & (PNG_ALL_FILTERS | 0x07))
+{
+#ifndef PNG_NO_WRITE_FILTER
+case 5:
+case 6:
+case 7: png_warning(png_ptr, "Unknown row filter for method 0");
+#endif /* PNG_NO_WRITE_FILTER */
+case PNG_FILTER_VALUE_NONE:
+png_ptr->do_filter=PNG_FILTER_NONE; break;
+#ifndef PNG_NO_WRITE_FILTER
+case PNG_FILTER_VALUE_SUB:
+png_ptr->do_filter=PNG_FILTER_SUB; break;
+case PNG_FILTER_VALUE_UP:
+png_ptr->do_filter=PNG_FILTER_UP; break;
+case PNG_FILTER_VALUE_AVG:
+png_ptr->do_filter=PNG_FILTER_AVG; break;
+case PNG_FILTER_VALUE_PAETH:
+png_ptr->do_filter=PNG_FILTER_PAETH; break;
+default: png_ptr->do_filter = (png_byte)filters; break;
+#else
+default: png_warning(png_ptr, "Unknown row filter for method 0");
+#endif /* PNG_NO_WRITE_FILTER */
+}
+/* If we have allocated the row_buf, this means we have already started
+* with the image and we should have allocated all of the filter buffers
+* that have been selected.  If prev_row isn't already allocated, then
+* it is too late to start using the filters that need it, since we
+* will be missing the data in the previous row.  If an application
+* wants to start and stop using particular filters during compression,
+* it should start out with all of the filters, and then add and
+* remove them after the start of compression.
+*/
+if (png_ptr->row_buf != NULL)
+{
+#ifndef PNG_NO_WRITE_FILTER
+if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
+{
+png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
+(png_ptr->rowbytes + 1));
+png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
+}
+if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
+{
+if (png_ptr->prev_row == NULL)
+{
+png_warning(png_ptr, "Can't add Up filter after starting");
+png_ptr->do_filter &= ~PNG_FILTER_UP;
+}
+else
+{
+png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
+(png_ptr->rowbytes + 1));
+png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;
+}
+}
+if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
+{
+if (png_ptr->prev_row == NULL)
+{
+png_warning(png_ptr, "Can't add Average filter after starting");
+png_ptr->do_filter &= ~PNG_FILTER_AVG;
+}
+else
+{
+png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,
+(png_ptr->rowbytes + 1));
+png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;
+}
+}
+if ((png_ptr->do_filter & PNG_FILTER_PAETH) &&
+png_ptr->paeth_row == NULL)
+{
+if (png_ptr->prev_row == NULL)
+{
+png_warning(png_ptr, "Can't add Paeth filter after starting");
+png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
+}
+else
+{
+png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
+(png_ptr->rowbytes + 1));
+png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
+}
+}
+if (png_ptr->do_filter == PNG_NO_FILTERS)
+#endif /* PNG_NO_WRITE_FILTER */
+png_ptr->do_filter = PNG_FILTER_NONE;
+}
+}
+else
+png_error(png_ptr, "Unknown custom filter method");
+}
+/* This allows us to influence the way in which libpng chooses the "best"
+* filter for the current scanline.  While the "minimum-sum-of-absolute-
+* differences metric is relatively fast and effective, there is some
+* question as to whether it can be improved upon by trying to keep the
+* filtered data going to zlib more consistent, hopefully resulting in
+* better compression.
+*/
+#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)      /* GRR 970116 */
+void PNGAPI
+png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
+int num_weights, png_doublep filter_weights,
+png_doublep filter_costs)
+{
+int i;
+png_debug(1, "in png_set_filter_heuristics\n");
+if (png_ptr == NULL)
+return;
+if (heuristic_method >= PNG_FILTER_HEURISTIC_LAST)
+{
+png_warning(png_ptr, "Unknown filter heuristic method");
+return;
+}
+if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
+{
+heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
+}
+if (num_weights < 0 || filter_weights == NULL ||
+heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
+{
+num_weights = 0;
+}
+png_ptr->num_prev_filters = (png_byte)num_weights;
+png_ptr->heuristic_method = (png_byte)heuristic_method;
+if (num_weights > 0)
+{
+if (png_ptr->prev_filters == NULL)
+{
+png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
+(png_uint_32)(png_sizeof(png_byte) * num_weights));
+/* To make sure that the weighting starts out fairly */
+for (i = 0; i < num_weights; i++)
+{
+png_ptr->prev_filters[i] = 255;
+}
+}
+if (png_ptr->filter_weights == NULL)
+{
+png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
+(png_uint_32)(png_sizeof(png_uint_16) * num_weights));
+png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
+(png_uint_32)(png_sizeof(png_uint_16) * num_weights));
+for (i = 0; i < num_weights; i++)
+{
+png_ptr->inv_filter_weights[i] =
+png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
+}
+}
+for (i = 0; i < num_weights; i++)
+{
+if (filter_weights[i] < 0.0)
+{
+png_ptr->inv_filter_weights[i] =
+png_ptr->filter_weights[i] = PNG_WEIGHT_FACTOR;
+}
+else
+{
+png_ptr->inv_filter_weights[i] =
+(png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
+png_ptr->filter_weights[i] =
+(png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
+}
+}
+}
+/* If, in the future, there are other filter methods, this would
+* need to be based on png_ptr->filter.
+*/
+if (png_ptr->filter_costs == NULL)
+{
+png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
+(png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
+(png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
+for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+{
+png_ptr->inv_filter_costs[i] =
+png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+}
+}
+/* Here is where we set the relative costs of the different filters.  We
+* should take the desired compression level into account when setting
+* the costs, so that Paeth, for instance, has a high relative cost at low
+* compression levels, while it has a lower relative cost at higher
+* compression settings.  The filter types are in order of increasing
+* relative cost, so it would be possible to do this with an algorithm.
+*/
+for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
+{
+if (filter_costs == NULL || filter_costs[i] < 0.0)
+{
+png_ptr->inv_filter_costs[i] =
+png_ptr->filter_costs[i] = PNG_COST_FACTOR;
+}
+else if (filter_costs[i] >= 1.0)
+{
+png_ptr->inv_filter_costs[i] =
+(png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
+png_ptr->filter_costs[i] =
+(png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
+}
+}
+}
+#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
+void PNGAPI
+png_set_compression_level(png_structp png_ptr, int level)
+{
+png_debug(1, "in png_set_compression_level\n");
+if (png_ptr == NULL)
+return;
+png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_LEVEL;
+png_ptr->zlib_level = level;
+}
+void PNGAPI
+png_set_compression_mem_level(png_structp png_ptr, int mem_level)
+{
+png_debug(1, "in png_set_compression_mem_level\n");
+if (png_ptr == NULL)
+return;
+png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL;
+png_ptr->zlib_mem_level = mem_level;
+}
+void PNGAPI
+png_set_compression_strategy(png_structp png_ptr, int strategy)
+{
+png_debug(1, "in png_set_compression_strategy\n");
+if (png_ptr == NULL)
+return;
+png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
+png_ptr->zlib_strategy = strategy;
+}
+void PNGAPI
+png_set_compression_window_bits(png_structp png_ptr, int window_bits)
+{
+if (png_ptr == NULL)
+return;
+if (window_bits > 15)
+png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
+else if (window_bits < 8)
+png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
+#ifndef WBITS_8_OK
+/* avoid libpng bug with 256-byte windows */
+if (window_bits == 8)
+{
+png_warning(png_ptr, "Compression window is being reset to 512");
+window_bits=9;
+}
+#endif
+png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
+png_ptr->zlib_window_bits = window_bits;
+}
+void PNGAPI
+png_set_compression_method(png_structp png_ptr, int method)
+{
+png_debug(1, "in png_set_compression_method\n");
+if (png_ptr == NULL)
+return;
+if (method != 8)
+png_warning(png_ptr, "Only compression method 8 is supported by PNG");
+png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_METHOD;
+png_ptr->zlib_method = method;
+}
+void PNGAPI
+png_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
+{
+if (png_ptr == NULL)
+return;
+png_ptr->write_row_fn = write_row_fn;
+}
+#if defined(PNG_WRITE_USER_TRANSFORM_SUPPORTED)
+void PNGAPI
+png_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
+write_user_transform_fn)
+{
+png_debug(1, "in png_set_write_user_transform_fn\n");
+if (png_ptr == NULL)
+return;
+png_ptr->transformations |= PNG_USER_TRANSFORM;
+png_ptr->write_user_transform_fn = write_user_transform_fn;
+}
+#endif
+#if defined(PNG_INFO_IMAGE_SUPPORTED)
+void PNGAPI
+png_write_png(png_structp png_ptr, png_infop info_ptr,
+int transforms, voidp params)
+{
+if (png_ptr == NULL || info_ptr == NULL)
+return;
+#if defined(PNG_WRITE_INVERT_ALPHA_SUPPORTED)
+/* invert the alpha channel from opacity to transparency */
+if (transforms & PNG_TRANSFORM_INVERT_ALPHA)
+png_set_invert_alpha(png_ptr);
+#endif
+/* Write the file header information. */
+png_write_info(png_ptr, info_ptr);
+/* ------ these transformations don't touch the info structure ------- */
+#if defined(PNG_WRITE_INVERT_SUPPORTED)
+/* invert monochrome pixels */
+if (transforms & PNG_TRANSFORM_INVERT_MONO)
+png_set_invert_mono(png_ptr);
+#endif
+#if defined(PNG_WRITE_SHIFT_SUPPORTED)
+/* Shift the pixels up to a legal bit depth and fill in
+* as appropriate to correctly scale the image.
+*/
+if ((transforms & PNG_TRANSFORM_SHIFT)
+&& (info_ptr->valid & PNG_INFO_sBIT))
+png_set_shift(png_ptr, &info_ptr->sig_bit);
+#endif
+#if defined(PNG_WRITE_PACK_SUPPORTED)
+/* pack pixels into bytes */
+if (transforms & PNG_TRANSFORM_PACKING)
+png_set_packing(png_ptr);
+#endif
+#if defined(PNG_WRITE_SWAP_ALPHA_SUPPORTED)
+/* swap location of alpha bytes from ARGB to RGBA */
+if (transforms & PNG_TRANSFORM_SWAP_ALPHA)
+png_set_swap_alpha(png_ptr);
+#endif
+#if defined(PNG_WRITE_FILLER_SUPPORTED)
+/* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
+* RGB (4 channels -> 3 channels). The second parameter is not used.
+*/
+if (transforms & PNG_TRANSFORM_STRIP_FILLER)
+png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
+#endif
+#if defined(PNG_WRITE_BGR_SUPPORTED)
+/* flip BGR pixels to RGB */
+if (transforms & PNG_TRANSFORM_BGR)
+png_set_bgr(png_ptr);
+#endif
+#if defined(PNG_WRITE_SWAP_SUPPORTED)
+/* swap bytes of 16-bit files to most significant byte first */
+if (transforms & PNG_TRANSFORM_SWAP_ENDIAN)
+png_set_swap(png_ptr);
+#endif
+#if defined(PNG_WRITE_PACKSWAP_SUPPORTED)
+/* swap bits of 1, 2, 4 bit packed pixel formats */
+if (transforms & PNG_TRANSFORM_PACKSWAP)
+png_set_packswap(png_ptr);
+#endif
+/* ----------------------- end of transformations ------------------- */
+/* write the bits */
+if (info_ptr->valid & PNG_INFO_IDAT)
+png_write_image(png_ptr, info_ptr->row_pointers);
+/* It is REQUIRED to call this to finish writing the rest of the file */
+png_write_end(png_ptr, info_ptr);
+transforms = transforms; /* quiet compiler warnings */
+params = params;
+}
+#endif
+#endif /* PNG_WRITE_SUPPORTED */