f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* pngwrite.c - general routines to write a PNG file
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * libpng 1.2.8 - December 3, 2004
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * For conditions of distribution and use, see copyright notice in png.h
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * Copyright (c) 1998-2004 Glenn Randers-Pehrson
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* get internal access to png.h */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Writes all the PNG information. This is the suggested way to use the
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * library. If you have a new chunk to add, make a function to write it,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * and put it in the correct location here. If you want the chunk written
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * after the image data, put it in png_write_end(). I strongly encourage
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * the chunk, as that will keep the code from breaking if you want to just
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * write a plain PNG file. If you have long comments, I suggest writing
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * them in png_write_end(), and compressing them.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE)&&(png_ptr->mng_features_permitted))
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr,"MNG features are not allowed in a PNG datastream\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write IHDR information. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* the rest of these check to see if the valid field has the appropriate
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync flag set, and if it does, writes the chunk. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_gAMA_fixed(png_ptr, info_ptr->int_gamma);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_chunk(png_ptr, up->name, up->data, up->size);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_write_info(png_structp png_ptr, png_infop info_ptr)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_error(png_ptr, "Valid palette required for paletted images\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* invert the alpha channel (in tRNS) */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->trans[j] = (png_byte)(255 - info_ptr->trans[j]);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_tRNS(png_ptr, info_ptr->trans, &(info_ptr->trans_values),
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->scal_pixel_width, info_ptr->scal_pixel_height);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync "png_write_sCAL not supported; sCAL chunk not written.\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Check to see if we need to write text chunks */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug2(2, "Writing header text chunk %d, type %d\n", i,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* an internationalized chunk? */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write international chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Unable to write international text\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Mark this chunk as written */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* If we want a compressed text chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write compressed chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Unable to write compressed text\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Mark this chunk as written */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write uncompressed chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Unable to write uncompressed text\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Mark this chunk as written */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_chunk(png_ptr, up->name, up->data, up->size);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Writes the end of the PNG file. If you don't want to write comments or
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * time information, you can pass NULL for info. If you already wrote these
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * in png_write_info(), do not write them again here. If you have long
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * comments, I suggest writing them here, and compressing them.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_write_end(png_structp png_ptr, png_infop info_ptr)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* see if user wants us to write information chunks */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync int i; /* local index variable */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* check to see if user has supplied a time chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* loop through comment chunks */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug2(2, "Writing trailer text chunk %d, type %d\n", i,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* an internationalized chunk? */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write international chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Unable to write international text\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Mark this chunk as written */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write compressed chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Unable to write compressed text\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Mark this chunk as written */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write uncompressed chunk */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Unable to write uncompressed text\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Mark this chunk as written */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync ((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_chunk(png_ptr, up->name, up->data, up->size);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write end of PNG file */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* This flush, added in libpng-1.0.8, causes some applications to crash
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync because they do not set png_ptr->output_flush_fn */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* "time.h" functions are not supported on WindowsCE */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_convert_from_struct_tm(png_timep ptime, struct tm FAR * ttime)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync ptime->year = (png_uint_16)(1900 + ttime->tm_year);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_convert_from_time_t(png_timep ptime, time_t ttime)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Initialize png_ptr structure, and allocate any memory needed */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_create_write_struct(png_const_charp user_png_ver, png_voidp error_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync warn_fn, png_voidp_NULL, png_malloc_ptr_NULL, png_free_ptr_NULL));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Alternate initialize png_ptr structure, and allocate any memory needed */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_create_write_struct_2(png_const_charp user_png_ver, png_voidp error_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_error_ptr error_fn, png_error_ptr warn_fn, png_voidp mem_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_USER_MEM_SUPPORTED */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr = (png_structp)png_create_struct_2(PNG_STRUCT_PNG,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_USER_MEM_SUPPORTED */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_1_0_X */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* added at libpng-1.2.6 */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_set_mem_fn(png_ptr, mem_ptr, malloc_fn, free_fn);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_USER_MEM_SUPPORTED */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_set_error_fn(png_ptr, error_ptr, error_fn, warn_fn);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync } while (png_libpng_ver[i++]);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Libpng 0.90 and later are binary incompatible with libpng 0.89, so
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * we must recompile any applications that use any older library version.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * For versions after libpng 1.0, we will be compatible, so we need
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * only check the first digit.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if (user_png_ver == NULL || user_png_ver[0] != png_libpng_ver[0] ||
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (user_png_ver[0] == '1' && user_png_ver[2] != png_libpng_ver[2]) ||
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync sprintf(msg, "Application is running with png.c from libpng-%.20s",
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync "Incompatible libpng version in application and library");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* initialize zbuf - compression buffer */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Applications that neglect to set up their own setjmp() and then encounter
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync a png_error() will longjmp here. Since the jmpbuf is then meaningless we
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync abort instead of returning. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_memcpy(png_ptr->jmpbuf,jmpbuf,png_sizeof(jmp_buf));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Initialize png_ptr structure, and allocate any memory needed */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* We only come here via pre-1.0.7-compiled applications */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_init_2(png_ptr, "1.0.6 or earlier", 0, 0);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_write_init_2(png_structp png_ptr, png_const_charp user_png_ver,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_size_t png_struct_size, png_size_t png_info_size)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* We only come here via pre-1.0.12-compiled applications */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync sprintf(msg, "Application was compiled with png.h from libpng-%.20s",
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync sprintf(msg, "Application is running with png.c from libpng-%.20s",
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync "The png struct allocated by the application for writing is too small.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync "The info struct allocated by the application for writing is too small.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_init_3(&png_ptr, user_png_ver, png_struct_size);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_write_init_3(png_structpp ptr_ptr, png_const_charp user_png_ver,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync "Application uses deprecated png_write_init() and should be recompiled.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync } while (png_libpng_ver[i++]);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* save jump buffer and error functions */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr = (png_structp)png_create_struct(PNG_STRUCT_PNG);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* reset all variables to 0 */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* added at libpng-1.2.6 */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_1_0_X */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* restore jump buffer */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_set_write_fn(png_ptr, png_voidp_NULL, png_rw_ptr_NULL,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* initialize zbuf - compression buffer */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_set_filter_heuristics(png_ptr, PNG_FILTER_HEURISTIC_DEFAULT,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Write a few rows of image data. If the image is interlaced,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * either you will have to write the 7 sub images, or, if you
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * have called png_set_interlace_handling(), you will have to
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * "write" the image seven times.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* loop through the rows */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Write the image. You only need to call this function once, even
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * if you are writing an interlaced image.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_write_image(png_structp png_ptr, png_bytepp image)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* intialize interlace handling. If image is not interlaced,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync this will set pass to 1 */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* loop through passes */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* loop through image */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync for (i = 0, rp = image; i < png_ptr->height; i++, rp++)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* called by user to write a row of image data */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug2(1, "in png_write_row (row %ld, pass %d)\n",
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* initialize transformations and other stuff if first time */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if (png_ptr->row_number == 0 && png_ptr->pass == 0)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* make sure we wrote the header info */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync "png_write_info was never called before png_write_row.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* check for transforms that have been set but were defined out */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if !defined(PNG_WRITE_INVERT_SUPPORTED) && defined(PNG_READ_INVERT_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "PNG_WRITE_INVERT_SUPPORTED is not defined.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if !defined(PNG_WRITE_FILLER_SUPPORTED) && defined(PNG_READ_FILLER_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "PNG_WRITE_FILLER_SUPPORTED is not defined.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if !defined(PNG_WRITE_PACKSWAP_SUPPORTED) && defined(PNG_READ_PACKSWAP_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "PNG_WRITE_PACKSWAP_SUPPORTED is not defined.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if !defined(PNG_WRITE_PACK_SUPPORTED) && defined(PNG_READ_PACK_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "PNG_WRITE_PACK_SUPPORTED is not defined.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if !defined(PNG_WRITE_SHIFT_SUPPORTED) && defined(PNG_READ_SHIFT_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "PNG_WRITE_SHIFT_SUPPORTED is not defined.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if !defined(PNG_WRITE_BGR_SUPPORTED) && defined(PNG_READ_BGR_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "PNG_WRITE_BGR_SUPPORTED is not defined.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if !defined(PNG_WRITE_SWAP_SUPPORTED) && defined(PNG_READ_SWAP_SUPPORTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "PNG_WRITE_SWAP_SUPPORTED is not defined.");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* if interlaced and not interested in row, return */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if (png_ptr->interlaced && (png_ptr->transformations & PNG_INTERLACE))
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if ((png_ptr->row_number & 0x07) || png_ptr->width < 5)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if ((png_ptr->row_number & 0x03) || png_ptr->width < 3)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if ((png_ptr->row_number & 0x01) || png_ptr->width < 2)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* set up row info for transformations */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->row_info.color_type = png_ptr->color_type;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->row_info.channels = png_ptr->usr_channels;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->row_info.bit_depth = png_ptr->usr_bit_depth;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->row_info.pixel_depth = (png_byte)(png_ptr->row_info.bit_depth *
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->row_info.rowbytes = PNG_ROWBYTES(png_ptr->row_info.pixel_depth,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug1(3, "row_info->color_type = %d\n", png_ptr->row_info.color_type);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug1(3, "row_info->width = %lu\n", png_ptr->row_info.width);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug1(3, "row_info->channels = %d\n", png_ptr->row_info.channels);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug1(3, "row_info->bit_depth = %d\n", png_ptr->row_info.bit_depth);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug1(3, "row_info->pixel_depth = %d\n", png_ptr->row_info.pixel_depth);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug1(3, "row_info->rowbytes = %lu\n", png_ptr->row_info.rowbytes);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Copy user's row into buffer, leaving room for filter byte. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_memcpy_check(png_ptr, png_ptr->row_buf + 1, row,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* handle interlacing */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* this should always get caught above, but still ... */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* handle other transformations */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Write filter_method 64 (intrapixel differencing) only if
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * 2. Libpng did not write a PNG signature (this filter_method is only
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * used in PNG datastreams that are embedded in MNG datastreams) and
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * 3. The application called png_permit_mng_features with a mask that
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * included PNG_FLAG_MNG_FILTER_64 and
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * 4. The filter_method is 64 and
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * 5. The color_type is RGB or RGBA
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_ptr->filter_type == PNG_INTRAPIXEL_DIFFERENCING))
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Intrapixel differencing */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_do_write_intrapixel(&(png_ptr->row_info), png_ptr->row_buf + 1);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Find a filter if necessary, filter the row and write it out. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_write_find_filter(png_ptr, &(png_ptr->row_info));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (*(png_ptr->write_row_fn))(png_ptr, png_ptr->row_number, png_ptr->pass);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Set the automatic flush interval or 0 to turn flushing off */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* flush the current output buffers now */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* We have already written out all of the data */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* compress the data */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* check for compression errors */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write the IDAT and reset the zlib output buffer */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* If there is any data left to be output, write it into a new IDAT */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if (png_ptr->zbuf_size != png_ptr->zstream.avail_out)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write the IDAT and reset the zlib output buffer */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_WRITE_FLUSH_SUPPORTED */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* free all memory used by the write */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_destroy_write_struct(png_structpp png_ptr_ptr, png_infopp info_ptr_ptr)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_free_data(png_ptr, info_ptr, PNG_FREE_ALL, -1);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_destroy_struct_2((png_voidp)info_ptr, (png_free_ptr)free_fn,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_destroy_struct_2((png_voidp)png_ptr, (png_free_ptr)free_fn,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Free any memory used in png_ptr struct (old method) */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncvoid /* PRIVATE */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* free any memory zlib uses */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* free our memory. png_free checks NULL for us. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* reset structure */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_memcpy(tmp_jmp, png_ptr->jmpbuf, png_sizeof (jmp_buf));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_memcpy(png_ptr->jmpbuf, tmp_jmp, png_sizeof (jmp_buf));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* Allow the application to select one or more row filters to use. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_filter(png_structp png_ptr, int method, int filters)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync case 7: png_warning(png_ptr, "Unknown row filter for method 0");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync case PNG_FILTER_VALUE_NONE: png_ptr->do_filter=PNG_FILTER_NONE; break;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync case PNG_FILTER_VALUE_SUB: png_ptr->do_filter=PNG_FILTER_SUB; break;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync case PNG_FILTER_VALUE_UP: png_ptr->do_filter=PNG_FILTER_UP; break;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync case PNG_FILTER_VALUE_AVG: png_ptr->do_filter=PNG_FILTER_AVG; break;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync case PNG_FILTER_VALUE_PAETH: png_ptr->do_filter=PNG_FILTER_PAETH;break;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync default: png_ptr->do_filter = (png_byte)filters; break;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* If we have allocated the row_buf, this means we have already started
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * with the image and we should have allocated all of the filter buffers
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * that have been selected. If prev_row isn't already allocated, then
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * it is too late to start using the filters that need it, since we
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * will be missing the data in the previous row. If an application
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * wants to start and stop using particular filters during compression,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * it should start out with all of the filters, and then add and
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * remove them after the start of compression.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if ((png_ptr->do_filter & PNG_FILTER_SUB) && png_ptr->sub_row == NULL)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if ((png_ptr->do_filter & PNG_FILTER_UP) && png_ptr->up_row == NULL)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Can't add Up filter after starting");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if ((png_ptr->do_filter & PNG_FILTER_AVG) && png_ptr->avg_row == NULL)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Can't add Average filter after starting");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Can't add Paeth filter after starting");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->do_filter &= (png_byte)(~PNG_FILTER_PAETH);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_error(png_ptr, "Unknown custom filter method");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync/* This allows us to influence the way in which libpng chooses the "best"
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * filter for the current scanline. While the "minimum-sum-of-absolute-
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * differences metric is relatively fast and effective, there is some
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * question as to whether it can be improved upon by trying to keep the
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * filtered data going to zlib more consistent, hopefully resulting in
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * better compression.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED) /* GRR 970116 */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Unknown filter heuristic method");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->heuristic_method = (png_byte)heuristic_method;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->prev_filters = (png_bytep)png_malloc(png_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_32)(png_sizeof(png_byte) * num_weights));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* To make sure that the weighting starts out fairly */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync for (i = 0; i < num_weights; i++)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->filter_weights = (png_uint_16p)png_malloc(png_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->inv_filter_weights = (png_uint_16p)png_malloc(png_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_32)(png_sizeof(png_uint_16) * num_weights));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync for (i = 0; i < num_weights; i++)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync for (i = 0; i < num_weights; i++)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_16)((double)PNG_WEIGHT_FACTOR*filter_weights[i]+0.5);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_16)((double)PNG_WEIGHT_FACTOR/filter_weights[i]+0.5);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* If, in the future, there are other filter methods, this would
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * need to be based on png_ptr->filter.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->filter_costs = (png_uint_16p)png_malloc(png_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->inv_filter_costs = (png_uint_16p)png_malloc(png_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_32)(png_sizeof(png_uint_16) * PNG_FILTER_VALUE_LAST));
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Here is where we set the relative costs of the different filters. We
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * should take the desired compression level into account when setting
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * the costs, so that Paeth, for instance, has a high relative cost at low
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * compression levels, while it has a lower relative cost at higher
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * compression settings. The filter types are in order of increasing
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * relative cost, so it would be possible to do this with an algorithm.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync for (i = 0; i < PNG_FILTER_VALUE_LAST; i++)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_16)((double)PNG_COST_FACTOR / filter_costs[i] + 0.5);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync (png_uint_16)((double)PNG_COST_FACTOR * filter_costs[i] + 0.5);
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_WRITE_WEIGHTED_FILTER_SUPPORTED */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_compression_level(png_structp png_ptr, int level)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_compression_mem_level(png_structp png_ptr, int mem_level)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug(1, "in png_set_compression_mem_level\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_compression_strategy(png_structp png_ptr, int strategy)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_compression_window_bits(png_structp png_ptr, int window_bits)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Only compression windows <= 32k supported by PNG");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Only compression windows >= 256 supported by PNG");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* avoid libpng bug with 256-byte windows */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Compression window is being reset to 512");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_compression_method(png_structp png_ptr, int method)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_warning(png_ptr, "Only compression method 8 is supported by PNG");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_write_status_fn(png_structp png_ptr, png_write_status_ptr write_row_fn)
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_set_write_user_transform_fn(png_structp png_ptr, png_user_transform_ptr
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_debug(1, "in png_set_write_user_transform_fn\n");
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync png_ptr->write_user_transform_fn = write_user_transform_fn;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsyncpng_write_png(png_structp png_ptr, png_infop info_ptr,
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* invert the alpha channel from opacity to transparency */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Write the file header information. */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* ------ these transformations don't touch the info structure ------- */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* invert monochrome pixels */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Shift the pixels up to a legal bit depth and fill in
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * as appropriate to correctly scale the image.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* pack pixels into bytes */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* swap location of alpha bytes from ARGB to RGBA */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* Get rid of filler (OR ALPHA) bytes, pack XRGB/RGBX/ARGB/RGBA into
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync * RGB (4 channels -> 3 channels). The second parameter is not used.
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* flip BGR pixels to RGB */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* swap bytes of 16-bit files to most significant byte first */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* swap bits of 1, 2, 4 bit packed pixel formats */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* ----------------------- end of transformations ------------------- */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* write the bits */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* It is REQUIRED to call this to finish writing the rest of the file */
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync /* quiet compiler warnings */ return;
f9a51917495bc8ba8b60632219652a7b122c1190vboxsync#endif /* PNG_WRITE_SUPPORTED */