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1669 lines
50 KiB
C
1669 lines
50 KiB
C
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/* pngwrite.c - general routines to write a PNG file
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*
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* Last changed in libpng 1.5.11 [June 14, 2012]
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* Copyright (c) 1998-2012 Glenn Randers-Pehrson
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* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
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* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
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*
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* This code is released under the libpng license.
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* For conditions of distribution and use, see the disclaimer
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* and license in png.h
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*/
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#include "pngpriv.h"
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#ifdef PNG_WRITE_SUPPORTED
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/* Writes all the PNG information. This is the suggested way to use the
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* library. If you have a new chunk to add, make a function to write it,
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* and put it in the correct location here. If you want the chunk written
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* after the image data, put it in png_write_end(). I strongly encourage
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* you to supply a PNG_INFO_ flag, and check info_ptr->valid before writing
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* the chunk, as that will keep the code from breaking if you want to just
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* write a plain PNG file. If you have long comments, I suggest writing
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* them in png_write_end(), and compressing them.
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*/
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void PNGAPI
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png_write_info_before_PLTE(png_structp png_ptr, png_infop info_ptr)
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{
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png_debug(1, "in png_write_info_before_PLTE");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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if (!(png_ptr->mode & PNG_WROTE_INFO_BEFORE_PLTE))
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{
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/* Write PNG signature */
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png_write_sig(png_ptr);
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#ifdef PNG_MNG_FEATURES_SUPPORTED
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if ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) && \
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(png_ptr->mng_features_permitted))
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{
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png_warning(png_ptr, "MNG features are not allowed in a PNG datastream");
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png_ptr->mng_features_permitted = 0;
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}
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#endif
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/* Write IHDR information. */
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png_write_IHDR(png_ptr, info_ptr->width, info_ptr->height,
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info_ptr->bit_depth, info_ptr->color_type, info_ptr->compression_type,
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info_ptr->filter_type,
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#ifdef PNG_WRITE_INTERLACING_SUPPORTED
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info_ptr->interlace_type);
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#else
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0);
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#endif
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/* The rest of these check to see if the valid field has the appropriate
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* flag set, and if it does, writes the chunk.
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*/
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#ifdef PNG_WRITE_gAMA_SUPPORTED
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if (info_ptr->valid & PNG_INFO_gAMA)
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png_write_gAMA_fixed(png_ptr, info_ptr->gamma);
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#endif
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#ifdef PNG_WRITE_sRGB_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sRGB)
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png_write_sRGB(png_ptr, (int)info_ptr->srgb_intent);
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#endif
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#ifdef PNG_WRITE_iCCP_SUPPORTED
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if (info_ptr->valid & PNG_INFO_iCCP)
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png_write_iCCP(png_ptr, info_ptr->iccp_name, PNG_COMPRESSION_TYPE_BASE,
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(png_charp)info_ptr->iccp_profile, (int)info_ptr->iccp_proflen);
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#endif
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#ifdef PNG_WRITE_sBIT_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sBIT)
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png_write_sBIT(png_ptr, &(info_ptr->sig_bit), info_ptr->color_type);
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#endif
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#ifdef PNG_WRITE_cHRM_SUPPORTED
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if (info_ptr->valid & PNG_INFO_cHRM)
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png_write_cHRM_fixed(png_ptr,
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info_ptr->x_white, info_ptr->y_white,
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info_ptr->x_red, info_ptr->y_red,
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info_ptr->x_green, info_ptr->y_green,
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info_ptr->x_blue, info_ptr->y_blue);
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#endif
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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if (info_ptr->unknown_chunks_num)
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{
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png_unknown_chunk *up;
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png_debug(5, "writing extra chunks");
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for (up = info_ptr->unknown_chunks;
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up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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up++)
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{
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int keep = png_handle_as_unknown(png_ptr, up->name);
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if (keep != PNG_HANDLE_CHUNK_NEVER &&
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up->location &&
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!(up->location & PNG_HAVE_PLTE) &&
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!(up->location & PNG_HAVE_IDAT) &&
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!(up->location & PNG_AFTER_IDAT) &&
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((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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{
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if (up->size == 0)
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png_warning(png_ptr, "Writing zero-length unknown chunk");
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png_write_chunk(png_ptr, up->name, up->data, up->size);
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}
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}
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}
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#endif
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png_ptr->mode |= PNG_WROTE_INFO_BEFORE_PLTE;
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}
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}
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void PNGAPI
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png_write_info(png_structp png_ptr, png_infop info_ptr)
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{
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#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)
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int i;
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#endif
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png_debug(1, "in png_write_info");
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if (png_ptr == NULL || info_ptr == NULL)
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return;
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png_write_info_before_PLTE(png_ptr, info_ptr);
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if (info_ptr->valid & PNG_INFO_PLTE)
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png_write_PLTE(png_ptr, info_ptr->palette,
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(png_uint_32)info_ptr->num_palette);
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else if (info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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png_error(png_ptr, "Valid palette required for paletted images");
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#ifdef PNG_WRITE_tRNS_SUPPORTED
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if (info_ptr->valid & PNG_INFO_tRNS)
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{
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#ifdef PNG_WRITE_INVERT_ALPHA_SUPPORTED
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/* Invert the alpha channel (in tRNS) */
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if ((png_ptr->transformations & PNG_INVERT_ALPHA) &&
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info_ptr->color_type == PNG_COLOR_TYPE_PALETTE)
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{
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int j;
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for (j = 0; j<(int)info_ptr->num_trans; j++)
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info_ptr->trans_alpha[j] =
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(png_byte)(255 - info_ptr->trans_alpha[j]);
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}
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#endif
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png_write_tRNS(png_ptr, info_ptr->trans_alpha, &(info_ptr->trans_color),
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info_ptr->num_trans, info_ptr->color_type);
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}
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#endif
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#ifdef PNG_WRITE_bKGD_SUPPORTED
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if (info_ptr->valid & PNG_INFO_bKGD)
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png_write_bKGD(png_ptr, &(info_ptr->background), info_ptr->color_type);
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#endif
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#ifdef PNG_WRITE_hIST_SUPPORTED
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if (info_ptr->valid & PNG_INFO_hIST)
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png_write_hIST(png_ptr, info_ptr->hist, info_ptr->num_palette);
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#endif
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#ifdef PNG_WRITE_oFFs_SUPPORTED
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if (info_ptr->valid & PNG_INFO_oFFs)
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png_write_oFFs(png_ptr, info_ptr->x_offset, info_ptr->y_offset,
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info_ptr->offset_unit_type);
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#endif
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#ifdef PNG_WRITE_pCAL_SUPPORTED
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if (info_ptr->valid & PNG_INFO_pCAL)
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png_write_pCAL(png_ptr, info_ptr->pcal_purpose, info_ptr->pcal_X0,
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info_ptr->pcal_X1, info_ptr->pcal_type, info_ptr->pcal_nparams,
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info_ptr->pcal_units, info_ptr->pcal_params);
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#endif
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#ifdef PNG_WRITE_sCAL_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sCAL)
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png_write_sCAL_s(png_ptr, (int)info_ptr->scal_unit,
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info_ptr->scal_s_width, info_ptr->scal_s_height);
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#endif /* sCAL */
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#ifdef PNG_WRITE_pHYs_SUPPORTED
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if (info_ptr->valid & PNG_INFO_pHYs)
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png_write_pHYs(png_ptr, info_ptr->x_pixels_per_unit,
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info_ptr->y_pixels_per_unit, info_ptr->phys_unit_type);
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#endif /* pHYs */
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#ifdef PNG_WRITE_tIME_SUPPORTED
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if (info_ptr->valid & PNG_INFO_tIME)
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{
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png_write_tIME(png_ptr, &(info_ptr->mod_time));
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png_ptr->mode |= PNG_WROTE_tIME;
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}
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#endif /* tIME */
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#ifdef PNG_WRITE_sPLT_SUPPORTED
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if (info_ptr->valid & PNG_INFO_sPLT)
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for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
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png_write_sPLT(png_ptr, info_ptr->splt_palettes + i);
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#endif /* sPLT */
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#ifdef PNG_WRITE_TEXT_SUPPORTED
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/* Check to see if we need to write text chunks */
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for (i = 0; i < info_ptr->num_text; i++)
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{
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png_debug2(2, "Writing header text chunk %d, type %d", i,
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info_ptr->text[i].compression);
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/* An internationalized chunk? */
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if (info_ptr->text[i].compression > 0)
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{
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#ifdef PNG_WRITE_iTXt_SUPPORTED
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/* Write international chunk */
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png_write_iTXt(png_ptr,
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info_ptr->text[i].compression,
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info_ptr->text[i].key,
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info_ptr->text[i].lang,
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info_ptr->text[i].lang_key,
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info_ptr->text[i].text);
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#else
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png_warning(png_ptr, "Unable to write international text");
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#endif
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/* Mark this chunk as written */
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info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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}
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/* If we want a compressed text chunk */
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else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_zTXt)
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{
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#ifdef PNG_WRITE_zTXt_SUPPORTED
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/* Write compressed chunk */
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png_write_zTXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text, 0,
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info_ptr->text[i].compression);
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#else
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png_warning(png_ptr, "Unable to write compressed text");
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#endif
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/* Mark this chunk as written */
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info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
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}
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else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
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{
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#ifdef PNG_WRITE_tEXt_SUPPORTED
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/* Write uncompressed chunk */
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png_write_tEXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text,
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0);
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/* Mark this chunk as written */
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info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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#else
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/* Can't get here */
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png_warning(png_ptr, "Unable to write uncompressed text");
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#endif
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}
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}
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#endif /* tEXt */
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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if (info_ptr->unknown_chunks_num)
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{
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png_unknown_chunk *up;
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png_debug(5, "writing extra chunks");
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for (up = info_ptr->unknown_chunks;
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up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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up++)
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{
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int keep = png_handle_as_unknown(png_ptr, up->name);
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if (keep != PNG_HANDLE_CHUNK_NEVER &&
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up->location &&
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(up->location & PNG_HAVE_PLTE) &&
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!(up->location & PNG_HAVE_IDAT) &&
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!(up->location & PNG_AFTER_IDAT) &&
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((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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{
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png_write_chunk(png_ptr, up->name, up->data, up->size);
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}
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}
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}
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#endif
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}
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/* Writes the end of the PNG file. If you don't want to write comments or
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* time information, you can pass NULL for info. If you already wrote these
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* in png_write_info(), do not write them again here. If you have long
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* comments, I suggest writing them here, and compressing them.
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*/
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void PNGAPI
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png_write_end(png_structp png_ptr, png_infop info_ptr)
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{
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png_debug(1, "in png_write_end");
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if (png_ptr == NULL)
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return;
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if (!(png_ptr->mode & PNG_HAVE_IDAT))
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png_error(png_ptr, "No IDATs written into file");
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#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
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if (png_ptr->num_palette_max > png_ptr->num_palette)
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png_benign_error(png_ptr, "Wrote palette index exceeding num_palette");
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#endif
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/* See if user wants us to write information chunks */
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if (info_ptr != NULL)
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{
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#ifdef PNG_WRITE_TEXT_SUPPORTED
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int i; /* local index variable */
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#endif
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#ifdef PNG_WRITE_tIME_SUPPORTED
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/* Check to see if user has supplied a time chunk */
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if ((info_ptr->valid & PNG_INFO_tIME) &&
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!(png_ptr->mode & PNG_WROTE_tIME))
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png_write_tIME(png_ptr, &(info_ptr->mod_time));
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#endif
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#ifdef PNG_WRITE_TEXT_SUPPORTED
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/* Loop through comment chunks */
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for (i = 0; i < info_ptr->num_text; i++)
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{
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png_debug2(2, "Writing trailer text chunk %d, type %d", i,
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info_ptr->text[i].compression);
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/* An internationalized chunk? */
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if (info_ptr->text[i].compression > 0)
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{
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#ifdef PNG_WRITE_iTXt_SUPPORTED
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/* Write international chunk */
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png_write_iTXt(png_ptr,
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info_ptr->text[i].compression,
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info_ptr->text[i].key,
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info_ptr->text[i].lang,
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info_ptr->text[i].lang_key,
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info_ptr->text[i].text);
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#else
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png_warning(png_ptr, "Unable to write international text");
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#endif
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/* Mark this chunk as written */
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info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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}
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else if (info_ptr->text[i].compression >= PNG_TEXT_COMPRESSION_zTXt)
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{
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#ifdef PNG_WRITE_zTXt_SUPPORTED
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/* Write compressed chunk */
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png_write_zTXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text, 0,
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info_ptr->text[i].compression);
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#else
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png_warning(png_ptr, "Unable to write compressed text");
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#endif
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/* Mark this chunk as written */
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info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_zTXt_WR;
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}
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else if (info_ptr->text[i].compression == PNG_TEXT_COMPRESSION_NONE)
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{
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#ifdef PNG_WRITE_tEXt_SUPPORTED
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/* Write uncompressed chunk */
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png_write_tEXt(png_ptr, info_ptr->text[i].key,
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info_ptr->text[i].text, 0);
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#else
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png_warning(png_ptr, "Unable to write uncompressed text");
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#endif
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/* Mark this chunk as written */
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info_ptr->text[i].compression = PNG_TEXT_COMPRESSION_NONE_WR;
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}
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}
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#endif
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#ifdef PNG_WRITE_UNKNOWN_CHUNKS_SUPPORTED
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if (info_ptr->unknown_chunks_num)
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{
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png_unknown_chunk *up;
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png_debug(5, "writing extra chunks");
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for (up = info_ptr->unknown_chunks;
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up < info_ptr->unknown_chunks + info_ptr->unknown_chunks_num;
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up++)
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{
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int keep = png_handle_as_unknown(png_ptr, up->name);
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if (keep != PNG_HANDLE_CHUNK_NEVER &&
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up->location &&
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(up->location & PNG_AFTER_IDAT) &&
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((up->name[3] & 0x20) || keep == PNG_HANDLE_CHUNK_ALWAYS ||
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(png_ptr->flags & PNG_FLAG_KEEP_UNSAFE_CHUNKS)))
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{
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png_write_chunk(png_ptr, up->name, up->data, up->size);
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}
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}
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}
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#endif
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}
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png_ptr->mode |= PNG_AFTER_IDAT;
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/* Write end of PNG file */
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png_write_IEND(png_ptr);
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/* This flush, added in libpng-1.0.8, removed from libpng-1.0.9beta03,
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* and restored again in libpng-1.2.30, may cause some applications that
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* do not set png_ptr->output_flush_fn to crash. If your application
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* experiences a problem, please try building libpng with
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* PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED defined, and report the event to
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* png-mng-implement at lists.sf.net .
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*/
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#ifdef PNG_WRITE_FLUSH_SUPPORTED
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# ifdef PNG_WRITE_FLUSH_AFTER_IEND_SUPPORTED
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png_flush(png_ptr);
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# endif
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#endif
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}
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#ifdef PNG_CONVERT_tIME_SUPPORTED
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/* "tm" structure is not supported on WindowsCE */
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void PNGAPI
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png_convert_from_struct_tm(png_timep ptime, PNG_CONST struct tm FAR * ttime)
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{
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png_debug(1, "in png_convert_from_struct_tm");
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ptime->year = (png_uint_16)(1900 + ttime->tm_year);
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ptime->month = (png_byte)(ttime->tm_mon + 1);
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ptime->day = (png_byte)ttime->tm_mday;
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ptime->hour = (png_byte)ttime->tm_hour;
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ptime->minute = (png_byte)ttime->tm_min;
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ptime->second = (png_byte)ttime->tm_sec;
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}
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void PNGAPI
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png_convert_from_time_t(png_timep ptime, time_t ttime)
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{
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struct tm *tbuf;
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png_debug(1, "in png_convert_from_time_t");
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tbuf = gmtime(&ttime);
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png_convert_from_struct_tm(ptime, tbuf);
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}
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#endif
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/* Initialize png_ptr structure, and allocate any memory needed */
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PNG_FUNCTION(png_structp,PNGAPI
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png_create_write_struct,(png_const_charp user_png_ver, png_voidp error_ptr,
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png_error_ptr error_fn, png_error_ptr warn_fn),PNG_ALLOCATED)
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{
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#ifdef PNG_USER_MEM_SUPPORTED
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return (png_create_write_struct_2(user_png_ver, error_ptr, error_fn,
|
|
warn_fn, NULL, NULL, NULL));
|
|
}
|
|
|
|
/* Alternate initialize png_ptr structure, and allocate any memory needed */
|
|
static void png_reset_filter_heuristics(png_structp png_ptr); /* forward decl */
|
|
|
|
PNG_FUNCTION(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),PNG_ALLOCATED)
|
|
{
|
|
#endif /* PNG_USER_MEM_SUPPORTED */
|
|
volatile int png_cleanup_needed = 0;
|
|
#ifdef PNG_SETJMP_SUPPORTED
|
|
volatile
|
|
#endif
|
|
png_structp png_ptr;
|
|
#ifdef PNG_SETJMP_SUPPORTED
|
|
#ifdef USE_FAR_KEYWORD
|
|
jmp_buf tmp_jmpbuf;
|
|
#endif
|
|
#endif
|
|
|
|
png_debug(1, "in png_create_write_struct");
|
|
|
|
#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
|
|
/* 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(tmp_jmpbuf))
|
|
#else
|
|
if (setjmp(png_jmpbuf(png_ptr))) /* sets longjmp to match setjmp */
|
|
#endif
|
|
#ifdef USE_FAR_KEYWORD
|
|
png_memcpy(png_jmpbuf(png_ptr), tmp_jmpbuf, png_sizeof(jmp_buf));
|
|
#endif
|
|
PNG_ABORT();
|
|
#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 (!png_user_version_check(png_ptr, user_png_ver))
|
|
png_cleanup_needed = 1;
|
|
|
|
/* Initialize zbuf - compression buffer */
|
|
png_ptr->zbuf_size = PNG_ZBUF_SIZE;
|
|
|
|
if (!png_cleanup_needed)
|
|
{
|
|
png_ptr->zbuf = (png_bytep)png_malloc_warn(png_ptr,
|
|
png_ptr->zbuf_size);
|
|
if (png_ptr->zbuf == NULL)
|
|
png_cleanup_needed = 1;
|
|
}
|
|
|
|
if (png_cleanup_needed)
|
|
{
|
|
/* Clean up PNG structure and deallocate any memory. */
|
|
png_free(png_ptr, png_ptr->zbuf);
|
|
png_ptr->zbuf = NULL;
|
|
#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
|
|
return (NULL);
|
|
}
|
|
|
|
png_set_write_fn(png_ptr, NULL, NULL, NULL);
|
|
|
|
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
|
|
png_reset_filter_heuristics(png_ptr);
|
|
#endif
|
|
|
|
return (png_ptr);
|
|
}
|
|
|
|
|
|
/* 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");
|
|
|
|
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");
|
|
|
|
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
|
|
/* Initialize 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_const_bytep row)
|
|
{
|
|
/* 1.5.6: moved from png_struct to be a local structure: */
|
|
png_row_info row_info;
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
png_debug2(1, "in png_write_row (row %u, pass %d)",
|
|
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);
|
|
}
|
|
|
|
#ifdef 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;
|
|
|
|
default: /* error: ignore it */
|
|
break;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
/* Set up row info for transformations */
|
|
row_info.color_type = png_ptr->color_type;
|
|
row_info.width = png_ptr->usr_width;
|
|
row_info.channels = png_ptr->usr_channels;
|
|
row_info.bit_depth = png_ptr->usr_bit_depth;
|
|
row_info.pixel_depth = (png_byte)(row_info.bit_depth * row_info.channels);
|
|
row_info.rowbytes = PNG_ROWBYTES(row_info.pixel_depth, row_info.width);
|
|
|
|
png_debug1(3, "row_info->color_type = %d", row_info.color_type);
|
|
png_debug1(3, "row_info->width = %u", row_info.width);
|
|
png_debug1(3, "row_info->channels = %d", row_info.channels);
|
|
png_debug1(3, "row_info->bit_depth = %d", row_info.bit_depth);
|
|
png_debug1(3, "row_info->pixel_depth = %d", row_info.pixel_depth);
|
|
png_debug1(3, "row_info->rowbytes = %lu", (unsigned long)row_info.rowbytes);
|
|
|
|
/* Copy user's row into buffer, leaving room for filter byte. */
|
|
png_memcpy(png_ptr->row_buf + 1, row, row_info.rowbytes);
|
|
|
|
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
|
|
/* Handle interlacing */
|
|
if (png_ptr->interlaced && png_ptr->pass < 6 &&
|
|
(png_ptr->transformations & PNG_INTERLACE))
|
|
{
|
|
png_do_write_interlace(&row_info, png_ptr->row_buf + 1, png_ptr->pass);
|
|
/* This should always get caught above, but still ... */
|
|
if (!(row_info.width))
|
|
{
|
|
png_write_finish_row(png_ptr);
|
|
return;
|
|
}
|
|
}
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_TRANSFORMS_SUPPORTED
|
|
/* Handle other transformations */
|
|
if (png_ptr->transformations)
|
|
png_do_write_transformations(png_ptr, &row_info);
|
|
#endif
|
|
|
|
/* At this point the row_info pixel depth must match the 'transformed' depth,
|
|
* which is also the output depth.
|
|
*/
|
|
if (row_info.pixel_depth != png_ptr->pixel_depth ||
|
|
row_info.pixel_depth != png_ptr->transformed_pixel_depth)
|
|
png_error(png_ptr, "internal write transform logic error");
|
|
|
|
#ifdef 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(&row_info, png_ptr->row_buf + 1);
|
|
}
|
|
#endif
|
|
|
|
/* Added at libpng-1.5.10 */
|
|
#ifdef PNG_WRITE_CHECK_FOR_INVALID_INDEX_SUPPORTED
|
|
/* Check for out-of-range palette index */
|
|
if (row_info.color_type == PNG_COLOR_TYPE_PALETTE &&
|
|
png_ptr->num_palette_max >= 0)
|
|
png_do_check_palette_indexes(png_ptr, &row_info);
|
|
#endif
|
|
|
|
/* Find a filter if necessary, filter the row and write it out. */
|
|
png_write_find_filter(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);
|
|
}
|
|
|
|
#ifdef 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");
|
|
|
|
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");
|
|
|
|
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);
|
|
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->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");
|
|
|
|
if (png_ptr_ptr != NULL)
|
|
png_ptr = *png_ptr_ptr;
|
|
|
|
#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);
|
|
|
|
#ifdef PNG_HANDLE_AS_UNKNOWN_SUPPORTED
|
|
if (png_ptr->num_chunk_list)
|
|
{
|
|
png_free(png_ptr, png_ptr->chunk_list);
|
|
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;
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
png_error_ptr warning_fn;
|
|
#endif
|
|
png_voidp error_ptr;
|
|
#ifdef PNG_USER_MEM_SUPPORTED
|
|
png_free_ptr free_fn;
|
|
#endif
|
|
|
|
png_debug(1, "in png_write_destroy");
|
|
|
|
/* Free any memory zlib uses */
|
|
if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED)
|
|
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);
|
|
#ifdef PNG_WRITE_FILTER_SUPPORTED
|
|
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
|
|
|
|
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
|
|
/* Use this to save a little code space, it doesn't free the filter_costs */
|
|
png_reset_filter_heuristics(png_ptr);
|
|
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->longjmp_buffer, png_sizeof(jmp_buf));
|
|
#endif
|
|
|
|
error_fn = png_ptr->error_fn;
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
warning_fn = png_ptr->warning_fn;
|
|
#endif
|
|
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;
|
|
#ifdef PNG_WARNINGS_SUPPORTED
|
|
png_ptr->warning_fn = warning_fn;
|
|
#endif
|
|
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->longjmp_buffer, 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");
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
#ifdef 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))
|
|
{
|
|
#ifdef PNG_WRITE_FILTER_SUPPORTED
|
|
case 5:
|
|
case 6:
|
|
case 7: png_warning(png_ptr, "Unknown row filter for method 0");
|
|
#endif /* PNG_WRITE_FILTER_SUPPORTED */
|
|
case PNG_FILTER_VALUE_NONE:
|
|
png_ptr->do_filter = PNG_FILTER_NONE; break;
|
|
|
|
#ifdef PNG_WRITE_FILTER_SUPPORTED
|
|
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_WRITE_FILTER_SUPPORTED */
|
|
}
|
|
|
|
/* 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)
|
|
{
|
|
#ifdef PNG_WRITE_FILTER_SUPPORTED
|
|
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_byte)(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_byte)(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_WRITE_FILTER_SUPPORTED */
|
|
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.
|
|
*/
|
|
#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED /* GRR 970116 */
|
|
/* Convenience reset API. */
|
|
static void
|
|
png_reset_filter_heuristics(png_structp png_ptr)
|
|
{
|
|
/* Clear out any old values in the 'weights' - this must be done because if
|
|
* the app calls set_filter_heuristics multiple times with different
|
|
* 'num_weights' values we would otherwise potentially have wrong sized
|
|
* arrays.
|
|
*/
|
|
png_ptr->num_prev_filters = 0;
|
|
png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_UNWEIGHTED;
|
|
if (png_ptr->prev_filters != NULL)
|
|
{
|
|
png_bytep old = png_ptr->prev_filters;
|
|
png_ptr->prev_filters = NULL;
|
|
png_free(png_ptr, old);
|
|
}
|
|
if (png_ptr->filter_weights != NULL)
|
|
{
|
|
png_uint_16p old = png_ptr->filter_weights;
|
|
png_ptr->filter_weights = NULL;
|
|
png_free(png_ptr, old);
|
|
}
|
|
|
|
if (png_ptr->inv_filter_weights != NULL)
|
|
{
|
|
png_uint_16p old = png_ptr->inv_filter_weights;
|
|
png_ptr->inv_filter_weights = NULL;
|
|
png_free(png_ptr, old);
|
|
}
|
|
|
|
/* Leave the filter_costs - this array is fixed size. */
|
|
}
|
|
|
|
static int
|
|
png_init_filter_heuristics(png_structp png_ptr, int heuristic_method,
|
|
int num_weights)
|
|
{
|
|
if (png_ptr == NULL)
|
|
return 0;
|
|
|
|
/* Clear out the arrays */
|
|
png_reset_filter_heuristics(png_ptr);
|
|
|
|
/* Check arguments; the 'reset' function makes the correct settings for the
|
|
* unweighted case, but we must handle the weight case by initializing the
|
|
* arrays for the caller.
|
|
*/
|
|
if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
|
|
{
|
|
int i;
|
|
|
|
if (num_weights > 0)
|
|
{
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* Safe to set this now */
|
|
png_ptr->num_prev_filters = (png_byte)num_weights;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* All the arrays are inited, safe to set this: */
|
|
png_ptr->heuristic_method = PNG_FILTER_HEURISTIC_WEIGHTED;
|
|
|
|
/* Return the 'ok' code. */
|
|
return 1;
|
|
}
|
|
else if (heuristic_method == PNG_FILTER_HEURISTIC_DEFAULT ||
|
|
heuristic_method == PNG_FILTER_HEURISTIC_UNWEIGHTED)
|
|
{
|
|
return 1;
|
|
}
|
|
else
|
|
{
|
|
png_warning(png_ptr, "Unknown filter heuristic method");
|
|
return 0;
|
|
}
|
|
}
|
|
|
|
/* Provide floating and fixed point APIs */
|
|
#ifdef PNG_FLOATING_POINT_SUPPORTED
|
|
void PNGAPI
|
|
png_set_filter_heuristics(png_structp png_ptr, int heuristic_method,
|
|
int num_weights, png_const_doublep filter_weights,
|
|
png_const_doublep filter_costs)
|
|
{
|
|
png_debug(1, "in png_set_filter_heuristics");
|
|
|
|
/* The internal API allocates all the arrays and ensures that the elements of
|
|
* those arrays are set to the default value.
|
|
*/
|
|
if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
|
|
return;
|
|
|
|
/* If using the weighted method copy in the weights. */
|
|
if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
|
|
{
|
|
int i;
|
|
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)(PNG_WEIGHT_FACTOR*filter_weights[i]+.5);
|
|
|
|
png_ptr->filter_weights[i] =
|
|
(png_uint_16)(PNG_WEIGHT_FACTOR/filter_weights[i]+.5);
|
|
}
|
|
}
|
|
|
|
/* 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[i] >= 1.0)
|
|
{
|
|
png_ptr->inv_filter_costs[i] =
|
|
(png_uint_16)(PNG_COST_FACTOR / filter_costs[i] + .5);
|
|
|
|
png_ptr->filter_costs[i] =
|
|
(png_uint_16)(PNG_COST_FACTOR * filter_costs[i] + .5);
|
|
}
|
|
}
|
|
}
|
|
#endif /* FLOATING_POINT */
|
|
|
|
#ifdef PNG_FIXED_POINT_SUPPORTED
|
|
void PNGAPI
|
|
png_set_filter_heuristics_fixed(png_structp png_ptr, int heuristic_method,
|
|
int num_weights, png_const_fixed_point_p filter_weights,
|
|
png_const_fixed_point_p filter_costs)
|
|
{
|
|
png_debug(1, "in png_set_filter_heuristics_fixed");
|
|
|
|
/* The internal API allocates all the arrays and ensures that the elements of
|
|
* those arrays are set to the default value.
|
|
*/
|
|
if (!png_init_filter_heuristics(png_ptr, heuristic_method, num_weights))
|
|
return;
|
|
|
|
/* If using the weighted method copy in the weights. */
|
|
if (heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
|
|
{
|
|
int i;
|
|
for (i = 0; i < num_weights; i++)
|
|
{
|
|
if (filter_weights[i] <= 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)
|
|
((PNG_WEIGHT_FACTOR*filter_weights[i]+PNG_FP_HALF)/PNG_FP_1);
|
|
|
|
png_ptr->filter_weights[i] = (png_uint_16)((PNG_WEIGHT_FACTOR*
|
|
PNG_FP_1+(filter_weights[i]/2))/filter_weights[i]);
|
|
}
|
|
}
|
|
|
|
/* 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[i] >= PNG_FP_1)
|
|
{
|
|
png_uint_32 tmp;
|
|
|
|
/* Use a 32 bit unsigned temporary here because otherwise the
|
|
* intermediate value will be a 32 bit *signed* integer (ANSI rules)
|
|
* and this will get the wrong answer on division.
|
|
*/
|
|
tmp = PNG_COST_FACTOR*PNG_FP_1 + (filter_costs[i]/2);
|
|
tmp /= filter_costs[i];
|
|
|
|
png_ptr->inv_filter_costs[i] = (png_uint_16)tmp;
|
|
|
|
tmp = PNG_COST_FACTOR * filter_costs[i] + PNG_FP_HALF;
|
|
tmp /= PNG_FP_1;
|
|
|
|
png_ptr->filter_costs[i] = (png_uint_16)tmp;
|
|
}
|
|
}
|
|
}
|
|
#endif /* FIXED_POINT */
|
|
#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");
|
|
|
|
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");
|
|
|
|
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");
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
png_ptr->flags |= PNG_FLAG_ZLIB_CUSTOM_STRATEGY;
|
|
png_ptr->zlib_strategy = strategy;
|
|
}
|
|
|
|
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
|
|
* smaller value of window_bits if it can do so safely.
|
|
*/
|
|
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");
|
|
|
|
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;
|
|
}
|
|
|
|
/* The following were added to libpng-1.5.4 */
|
|
#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED
|
|
void PNGAPI
|
|
png_set_text_compression_level(png_structp png_ptr, int level)
|
|
{
|
|
png_debug(1, "in png_set_text_compression_level");
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_LEVEL;
|
|
png_ptr->zlib_text_level = level;
|
|
}
|
|
|
|
void PNGAPI
|
|
png_set_text_compression_mem_level(png_structp png_ptr, int mem_level)
|
|
{
|
|
png_debug(1, "in png_set_text_compression_mem_level");
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL;
|
|
png_ptr->zlib_text_mem_level = mem_level;
|
|
}
|
|
|
|
void PNGAPI
|
|
png_set_text_compression_strategy(png_structp png_ptr, int strategy)
|
|
{
|
|
png_debug(1, "in png_set_text_compression_strategy");
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_STRATEGY;
|
|
png_ptr->zlib_text_strategy = strategy;
|
|
}
|
|
|
|
/* If PNG_WRITE_OPTIMIZE_CMF_SUPPORTED is defined, libpng will use a
|
|
* smaller value of window_bits if it can do so safely.
|
|
*/
|
|
void PNGAPI
|
|
png_set_text_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, "Text compression window is being reset to 512");
|
|
window_bits = 9;
|
|
}
|
|
|
|
#endif
|
|
png_ptr->flags |= PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS;
|
|
png_ptr->zlib_text_window_bits = window_bits;
|
|
}
|
|
|
|
void PNGAPI
|
|
png_set_text_compression_method(png_structp png_ptr, int method)
|
|
{
|
|
png_debug(1, "in png_set_text_compression_method");
|
|
|
|
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_ZTXT_CUSTOM_METHOD;
|
|
png_ptr->zlib_text_method = method;
|
|
}
|
|
#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */
|
|
/* end of API added to libpng-1.5.4 */
|
|
|
|
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;
|
|
}
|
|
|
|
#ifdef 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");
|
|
|
|
if (png_ptr == NULL)
|
|
return;
|
|
|
|
png_ptr->transformations |= PNG_USER_TRANSFORM;
|
|
png_ptr->write_user_transform_fn = write_user_transform_fn;
|
|
}
|
|
#endif
|
|
|
|
|
|
#ifdef 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;
|
|
|
|
/* Write the file header information. */
|
|
png_write_info(png_ptr, info_ptr);
|
|
|
|
/* ------ these transformations don't touch the info structure ------- */
|
|
|
|
#ifdef PNG_WRITE_INVERT_SUPPORTED
|
|
/* Invert monochrome pixels */
|
|
if (transforms & PNG_TRANSFORM_INVERT_MONO)
|
|
png_set_invert_mono(png_ptr);
|
|
#endif
|
|
|
|
#ifdef 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
|
|
|
|
#ifdef PNG_WRITE_PACK_SUPPORTED
|
|
/* Pack pixels into bytes */
|
|
if (transforms & PNG_TRANSFORM_PACKING)
|
|
png_set_packing(png_ptr);
|
|
#endif
|
|
|
|
#ifdef 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
|
|
|
|
#ifdef PNG_WRITE_FILLER_SUPPORTED
|
|
/* Pack XRGB/RGBX/ARGB/RGBA into RGB (4 channels -> 3 channels) */
|
|
if (transforms & PNG_TRANSFORM_STRIP_FILLER_AFTER)
|
|
png_set_filler(png_ptr, 0, PNG_FILLER_AFTER);
|
|
|
|
else if (transforms & PNG_TRANSFORM_STRIP_FILLER_BEFORE)
|
|
png_set_filler(png_ptr, 0, PNG_FILLER_BEFORE);
|
|
#endif
|
|
|
|
#ifdef PNG_WRITE_BGR_SUPPORTED
|
|
/* Flip BGR pixels to RGB */
|
|
if (transforms & PNG_TRANSFORM_BGR)
|
|
png_set_bgr(png_ptr);
|
|
#endif
|
|
|
|
#ifdef 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
|
|
|
|
#ifdef 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
|
|
|
|
#ifdef 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
|
|
|
|
/* ----------------------- 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);
|
|
|
|
PNG_UNUSED(transforms) /* Quiet compiler warnings */
|
|
PNG_UNUSED(params)
|
|
}
|
|
#endif
|
|
#endif /* PNG_WRITE_SUPPORTED */
|