+++ /dev/null
-\r
-/* pngwutil.c - utilities to write a PNG file\r
- *\r
- * Last changed in libpng 1.5.6 [November 3, 2011]\r
- * Copyright (c) 1998-2011 Glenn Randers-Pehrson\r
- * (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)\r
- * (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)\r
- *\r
- * This code is released under the libpng license.\r
- * For conditions of distribution and use, see the disclaimer\r
- * and license in png.h\r
- */\r
-\r
-#include "pngpriv.h"\r
-\r
-#ifdef PNG_WRITE_SUPPORTED\r
-\r
-#ifdef PNG_WRITE_INT_FUNCTIONS_SUPPORTED\r
-/* Place a 32-bit number into a buffer in PNG byte order. We work\r
- * with unsigned numbers for convenience, although one supported\r
- * ancillary chunk uses signed (two's complement) numbers.\r
- */\r
-void PNGAPI\r
-png_save_uint_32(png_bytep buf, png_uint_32 i)\r
-{\r
- buf[0] = (png_byte)((i >> 24) & 0xff);\r
- buf[1] = (png_byte)((i >> 16) & 0xff);\r
- buf[2] = (png_byte)((i >> 8) & 0xff);\r
- buf[3] = (png_byte)(i & 0xff);\r
-}\r
-\r
-#ifdef PNG_SAVE_INT_32_SUPPORTED\r
-/* The png_save_int_32 function assumes integers are stored in two's\r
- * complement format. If this isn't the case, then this routine needs to\r
- * be modified to write data in two's complement format. Note that,\r
- * the following works correctly even if png_int_32 has more than 32 bits\r
- * (compare the more complex code required on read for sign extention.)\r
- */\r
-void PNGAPI\r
-png_save_int_32(png_bytep buf, png_int_32 i)\r
-{\r
- buf[0] = (png_byte)((i >> 24) & 0xff);\r
- buf[1] = (png_byte)((i >> 16) & 0xff);\r
- buf[2] = (png_byte)((i >> 8) & 0xff);\r
- buf[3] = (png_byte)(i & 0xff);\r
-}\r
-#endif\r
-\r
-/* Place a 16-bit number into a buffer in PNG byte order.\r
- * The parameter is declared unsigned int, not png_uint_16,\r
- * just to avoid potential problems on pre-ANSI C compilers.\r
- */\r
-void PNGAPI\r
-png_save_uint_16(png_bytep buf, unsigned int i)\r
-{\r
- buf[0] = (png_byte)((i >> 8) & 0xff);\r
- buf[1] = (png_byte)(i & 0xff);\r
-}\r
-#endif\r
-\r
-/* Simple function to write the signature. If we have already written\r
- * the magic bytes of the signature, or more likely, the PNG stream is\r
- * being embedded into another stream and doesn't need its own signature,\r
- * we should call png_set_sig_bytes() to tell libpng how many of the\r
- * bytes have already been written.\r
- */\r
-void PNGAPI\r
-png_write_sig(png_structp png_ptr)\r
-{\r
- png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};\r
-\r
-#ifdef PNG_IO_STATE_SUPPORTED\r
- /* Inform the I/O callback that the signature is being written */\r
- png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE;\r
-#endif\r
-\r
- /* Write the rest of the 8 byte signature */\r
- png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],\r
- (png_size_t)(8 - png_ptr->sig_bytes));\r
-\r
- if (png_ptr->sig_bytes < 3)\r
- png_ptr->mode |= PNG_HAVE_PNG_SIGNATURE;\r
-}\r
-\r
-/* Write the start of a PNG chunk. The type is the chunk type.\r
- * The total_length is the sum of the lengths of all the data you will be\r
- * passing in png_write_chunk_data().\r
- */\r
-static void\r
-png_write_chunk_header(png_structp png_ptr, png_uint_32 chunk_name,\r
- png_uint_32 length)\r
-{\r
- png_byte buf[8];\r
-\r
-#if defined(PNG_DEBUG) && (PNG_DEBUG > 0)\r
- PNG_CSTRING_FROM_CHUNK(buf, chunk_name);\r
- png_debug2(0, "Writing %s chunk, length = %lu", buf, (unsigned long)length);\r
-#endif\r
-\r
- if (png_ptr == NULL)\r
- return;\r
-\r
-#ifdef PNG_IO_STATE_SUPPORTED\r
- /* Inform the I/O callback that the chunk header is being written.\r
- * PNG_IO_CHUNK_HDR requires a single I/O call.\r
- */\r
- png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR;\r
-#endif\r
-\r
- /* Write the length and the chunk name */\r
- png_save_uint_32(buf, length);\r
- png_save_uint_32(buf + 4, chunk_name);\r
- png_write_data(png_ptr, buf, 8);\r
-\r
- /* Put the chunk name into png_ptr->chunk_name */\r
- png_ptr->chunk_name = chunk_name;\r
-\r
- /* Reset the crc and run it over the chunk name */\r
- png_reset_crc(png_ptr);\r
-\r
- png_calculate_crc(png_ptr, buf + 4, 4);\r
-\r
-#ifdef PNG_IO_STATE_SUPPORTED\r
- /* Inform the I/O callback that chunk data will (possibly) be written.\r
- * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls.\r
- */\r
- png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA;\r
-#endif\r
-}\r
-\r
-void PNGAPI\r
-png_write_chunk_start(png_structp png_ptr, png_const_bytep chunk_string,\r
- png_uint_32 length)\r
-{\r
- png_write_chunk_header(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), length);\r
-}\r
-\r
-/* Write the data of a PNG chunk started with png_write_chunk_header().\r
- * Note that multiple calls to this function are allowed, and that the\r
- * sum of the lengths from these calls *must* add up to the total_length\r
- * given to png_write_chunk_header().\r
- */\r
-void PNGAPI\r
-png_write_chunk_data(png_structp png_ptr, png_const_bytep data,\r
- png_size_t length)\r
-{\r
- /* Write the data, and run the CRC over it */\r
- if (png_ptr == NULL)\r
- return;\r
-\r
- if (data != NULL && length > 0)\r
- {\r
- png_write_data(png_ptr, data, length);\r
-\r
- /* Update the CRC after writing the data,\r
- * in case that the user I/O routine alters it.\r
- */\r
- png_calculate_crc(png_ptr, data, length);\r
- }\r
-}\r
-\r
-/* Finish a chunk started with png_write_chunk_header(). */\r
-void PNGAPI\r
-png_write_chunk_end(png_structp png_ptr)\r
-{\r
- png_byte buf[4];\r
-\r
- if (png_ptr == NULL) return;\r
-\r
-#ifdef PNG_IO_STATE_SUPPORTED\r
- /* Inform the I/O callback that the chunk CRC is being written.\r
- * PNG_IO_CHUNK_CRC requires a single I/O function call.\r
- */\r
- png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC;\r
-#endif\r
-\r
- /* Write the crc in a single operation */\r
- png_save_uint_32(buf, png_ptr->crc);\r
-\r
- png_write_data(png_ptr, buf, (png_size_t)4);\r
-}\r
-\r
-/* Write a PNG chunk all at once. The type is an array of ASCII characters\r
- * representing the chunk name. The array must be at least 4 bytes in\r
- * length, and does not need to be null terminated. To be safe, pass the\r
- * pre-defined chunk names here, and if you need a new one, define it\r
- * where the others are defined. The length is the length of the data.\r
- * All the data must be present. If that is not possible, use the\r
- * png_write_chunk_start(), png_write_chunk_data(), and png_write_chunk_end()\r
- * functions instead.\r
- */\r
-static void\r
-png_write_complete_chunk(png_structp png_ptr, png_uint_32 chunk_name,\r
- png_const_bytep data, png_size_t length)\r
-{\r
- if (png_ptr == NULL)\r
- return;\r
-\r
- /* On 64 bit architectures 'length' may not fit in a png_uint_32. */\r
- if (length > PNG_UINT_32_MAX)\r
- png_error(png_ptr, "length exceeds PNG maxima");\r
-\r
- png_write_chunk_header(png_ptr, chunk_name, (png_uint_32)length);\r
- png_write_chunk_data(png_ptr, data, length);\r
- png_write_chunk_end(png_ptr);\r
-}\r
-\r
-/* This is the API that calls the internal function above. */\r
-void PNGAPI\r
-png_write_chunk(png_structp png_ptr, png_const_bytep chunk_string,\r
- png_const_bytep data, png_size_t length)\r
-{\r
- png_write_complete_chunk(png_ptr, PNG_CHUNK_FROM_STRING(chunk_string), data,\r
- length);\r
-}\r
-\r
-/* Initialize the compressor for the appropriate type of compression. */\r
-static void\r
-png_zlib_claim(png_structp png_ptr, png_uint_32 state)\r
-{\r
- if (!(png_ptr->zlib_state & PNG_ZLIB_IN_USE))\r
- {\r
- /* If already initialized for 'state' do not re-init. */\r
- if (png_ptr->zlib_state != state)\r
- {\r
- int ret = Z_OK;\r
- png_const_charp who = "-";\r
-\r
- /* If actually initialized for another state do a deflateEnd. */\r
- if (png_ptr->zlib_state != PNG_ZLIB_UNINITIALIZED)\r
- {\r
- ret = deflateEnd(&png_ptr->zstream);\r
- who = "end";\r
- png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED;\r
- }\r
-\r
- /* zlib itself detects an incomplete state on deflateEnd */\r
- if (ret == Z_OK) switch (state)\r
- {\r
-# ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED\r
- case PNG_ZLIB_FOR_TEXT:\r
- ret = deflateInit2(&png_ptr->zstream,\r
- png_ptr->zlib_text_level, png_ptr->zlib_text_method,\r
- png_ptr->zlib_text_window_bits,\r
- png_ptr->zlib_text_mem_level, png_ptr->zlib_text_strategy);\r
- who = "text";\r
- break;\r
-# endif\r
-\r
- case PNG_ZLIB_FOR_IDAT:\r
- ret = deflateInit2(&png_ptr->zstream, png_ptr->zlib_level,\r
- png_ptr->zlib_method, png_ptr->zlib_window_bits,\r
- png_ptr->zlib_mem_level, png_ptr->zlib_strategy);\r
- who = "IDAT";\r
- break;\r
-\r
- default:\r
- png_error(png_ptr, "invalid zlib state");\r
- }\r
-\r
- if (ret == Z_OK)\r
- png_ptr->zlib_state = state;\r
-\r
- else /* an error in deflateEnd or deflateInit2 */\r
- {\r
- size_t pos = 0;\r
- char msg[64];\r
-\r
- pos = png_safecat(msg, sizeof msg, pos,\r
- "zlib failed to initialize compressor (");\r
- pos = png_safecat(msg, sizeof msg, pos, who);\r
-\r
- switch (ret)\r
- {\r
- case Z_VERSION_ERROR:\r
- pos = png_safecat(msg, sizeof msg, pos, ") version error");\r
- break;\r
-\r
- case Z_STREAM_ERROR:\r
- pos = png_safecat(msg, sizeof msg, pos, ") stream error");\r
- break;\r
-\r
- case Z_MEM_ERROR:\r
- pos = png_safecat(msg, sizeof msg, pos, ") memory error");\r
- break;\r
-\r
- default:\r
- pos = png_safecat(msg, sizeof msg, pos, ") unknown error");\r
- break;\r
- }\r
-\r
- png_error(png_ptr, msg);\r
- }\r
- }\r
-\r
- /* Here on success, claim the zstream: */\r
- png_ptr->zlib_state |= PNG_ZLIB_IN_USE;\r
- }\r
-\r
- else\r
- png_error(png_ptr, "zstream already in use (internal error)");\r
-}\r
-\r
-/* The opposite: release the stream. It is also reset, this API will warn on\r
- * error but will not fail.\r
- */\r
-static void\r
-png_zlib_release(png_structp png_ptr)\r
-{\r
- if (png_ptr->zlib_state & PNG_ZLIB_IN_USE)\r
- {\r
- int ret = deflateReset(&png_ptr->zstream);\r
-\r
- png_ptr->zlib_state &= ~PNG_ZLIB_IN_USE;\r
-\r
- if (ret != Z_OK)\r
- {\r
- png_const_charp err;\r
- PNG_WARNING_PARAMETERS(p)\r
-\r
- switch (ret)\r
- {\r
- case Z_VERSION_ERROR:\r
- err = "version";\r
- break;\r
-\r
- case Z_STREAM_ERROR:\r
- err = "stream";\r
- break;\r
-\r
- case Z_MEM_ERROR:\r
- err = "memory";\r
- break;\r
-\r
- default:\r
- err = "unknown";\r
- break;\r
- }\r
-\r
- png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d, ret);\r
- png_warning_parameter(p, 2, err);\r
-\r
- if (png_ptr->zstream.msg)\r
- err = png_ptr->zstream.msg;\r
- else\r
- err = "[no zlib message]";\r
-\r
- png_warning_parameter(p, 3, err);\r
-\r
- png_formatted_warning(png_ptr, p,\r
- "zlib failed to reset compressor: @1(@2): @3");\r
- }\r
- }\r
-\r
- else\r
- png_warning(png_ptr, "zstream not in use (internal error)");\r
-}\r
-\r
-#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED\r
-/* This pair of functions encapsulates the operation of (a) compressing a\r
- * text string, and (b) issuing it later as a series of chunk data writes.\r
- * The compression_state structure is shared context for these functions\r
- * set up by the caller in order to make the whole mess thread-safe.\r
- */\r
-\r
-typedef struct\r
-{\r
- png_const_bytep input; /* The uncompressed input data */\r
- png_size_t input_len; /* Its length */\r
- int num_output_ptr; /* Number of output pointers used */\r
- int max_output_ptr; /* Size of output_ptr */\r
- png_bytep *output_ptr; /* Array of pointers to output */\r
-} compression_state;\r
-\r
-/* Compress given text into storage in the png_ptr structure */\r
-static int /* PRIVATE */\r
-png_text_compress(png_structp png_ptr,\r
- png_const_charp text, png_size_t text_len, int compression,\r
- compression_state *comp)\r
-{\r
- int ret;\r
-\r
- comp->num_output_ptr = 0;\r
- comp->max_output_ptr = 0;\r
- comp->output_ptr = NULL;\r
- comp->input = NULL;\r
- comp->input_len = text_len;\r
-\r
- /* We may just want to pass the text right through */\r
- if (compression == PNG_TEXT_COMPRESSION_NONE)\r
- {\r
- comp->input = (png_const_bytep)text;\r
- return((int)text_len);\r
- }\r
-\r
- if (compression >= PNG_TEXT_COMPRESSION_LAST)\r
- {\r
- PNG_WARNING_PARAMETERS(p)\r
-\r
- png_warning_parameter_signed(p, 1, PNG_NUMBER_FORMAT_d,\r
- compression);\r
- png_formatted_warning(png_ptr, p, "Unknown compression type @1");\r
- }\r
-\r
- /* We can't write the chunk until we find out how much data we have,\r
- * which means we need to run the compressor first and save the\r
- * output. This shouldn't be a problem, as the vast majority of\r
- * comments should be reasonable, but we will set up an array of\r
- * malloc'd pointers to be sure.\r
- *\r
- * If we knew the application was well behaved, we could simplify this\r
- * greatly by assuming we can always malloc an output buffer large\r
- * enough to hold the compressed text ((1001 * text_len / 1000) + 12)\r
- * and malloc this directly. The only time this would be a bad idea is\r
- * if we can't malloc more than 64K and we have 64K of random input\r
- * data, or if the input string is incredibly large (although this\r
- * wouldn't cause a failure, just a slowdown due to swapping).\r
- */\r
- png_zlib_claim(png_ptr, PNG_ZLIB_FOR_TEXT);\r
-\r
- /* Set up the compression buffers */\r
- /* TODO: the following cast hides a potential overflow problem. */\r
- png_ptr->zstream.avail_in = (uInt)text_len;\r
-\r
- /* NOTE: assume zlib doesn't overwrite the input */\r
- png_ptr->zstream.next_in = (Bytef *)text;\r
- png_ptr->zstream.avail_out = png_ptr->zbuf_size;\r
- png_ptr->zstream.next_out = png_ptr->zbuf;\r
-\r
- /* This is the same compression loop as in png_write_row() */\r
- do\r
- {\r
- /* Compress the data */\r
- ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);\r
-\r
- if (ret != Z_OK)\r
- {\r
- /* Error */\r
- if (png_ptr->zstream.msg != NULL)\r
- png_error(png_ptr, png_ptr->zstream.msg);\r
-\r
- else\r
- png_error(png_ptr, "zlib error");\r
- }\r
-\r
- /* Check to see if we need more room */\r
- if (!(png_ptr->zstream.avail_out))\r
- {\r
- /* Make sure the output array has room */\r
- if (comp->num_output_ptr >= comp->max_output_ptr)\r
- {\r
- int old_max;\r
-\r
- old_max = comp->max_output_ptr;\r
- comp->max_output_ptr = comp->num_output_ptr + 4;\r
- if (comp->output_ptr != NULL)\r
- {\r
- png_bytepp old_ptr;\r
-\r
- old_ptr = comp->output_ptr;\r
-\r
- comp->output_ptr = (png_bytepp)png_malloc(png_ptr,\r
- (png_alloc_size_t)\r
- (comp->max_output_ptr * png_sizeof(png_charpp)));\r
-\r
- png_memcpy(comp->output_ptr, old_ptr, old_max\r
- * png_sizeof(png_charp));\r
-\r
- png_free(png_ptr, old_ptr);\r
- }\r
- else\r
- comp->output_ptr = (png_bytepp)png_malloc(png_ptr,\r
- (png_alloc_size_t)\r
- (comp->max_output_ptr * png_sizeof(png_charp)));\r
- }\r
-\r
- /* Save the data */\r
- comp->output_ptr[comp->num_output_ptr] =\r
- (png_bytep)png_malloc(png_ptr,\r
- (png_alloc_size_t)png_ptr->zbuf_size);\r
-\r
- png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,\r
- png_ptr->zbuf_size);\r
-\r
- comp->num_output_ptr++;\r
-\r
- /* and reset the buffer */\r
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;\r
- png_ptr->zstream.next_out = png_ptr->zbuf;\r
- }\r
- /* Continue until we don't have any more to compress */\r
- } while (png_ptr->zstream.avail_in);\r
-\r
- /* Finish the compression */\r
- do\r
- {\r
- /* Tell zlib we are finished */\r
- ret = deflate(&png_ptr->zstream, Z_FINISH);\r
-\r
- if (ret == Z_OK)\r
- {\r
- /* Check to see if we need more room */\r
- if (!(png_ptr->zstream.avail_out))\r
- {\r
- /* Check to make sure our output array has room */\r
- if (comp->num_output_ptr >= comp->max_output_ptr)\r
- {\r
- int old_max;\r
-\r
- old_max = comp->max_output_ptr;\r
- comp->max_output_ptr = comp->num_output_ptr + 4;\r
- if (comp->output_ptr != NULL)\r
- {\r
- png_bytepp old_ptr;\r
-\r
- old_ptr = comp->output_ptr;\r
-\r
- /* This could be optimized to realloc() */\r
- comp->output_ptr = (png_bytepp)png_malloc(png_ptr,\r
- (png_alloc_size_t)(comp->max_output_ptr *\r
- png_sizeof(png_charp)));\r
-\r
- png_memcpy(comp->output_ptr, old_ptr,\r
- old_max * png_sizeof(png_charp));\r
-\r
- png_free(png_ptr, old_ptr);\r
- }\r
-\r
- else\r
- comp->output_ptr = (png_bytepp)png_malloc(png_ptr,\r
- (png_alloc_size_t)(comp->max_output_ptr *\r
- png_sizeof(png_charp)));\r
- }\r
-\r
- /* Save the data */\r
- comp->output_ptr[comp->num_output_ptr] =\r
- (png_bytep)png_malloc(png_ptr,\r
- (png_alloc_size_t)png_ptr->zbuf_size);\r
-\r
- png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,\r
- png_ptr->zbuf_size);\r
-\r
- comp->num_output_ptr++;\r
-\r
- /* and reset the buffer pointers */\r
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;\r
- png_ptr->zstream.next_out = png_ptr->zbuf;\r
- }\r
- }\r
- else if (ret != Z_STREAM_END)\r
- {\r
- /* We got an error */\r
- if (png_ptr->zstream.msg != NULL)\r
- png_error(png_ptr, png_ptr->zstream.msg);\r
-\r
- else\r
- png_error(png_ptr, "zlib error");\r
- }\r
- } while (ret != Z_STREAM_END);\r
-\r
- /* Text length is number of buffers plus last buffer */\r
- text_len = png_ptr->zbuf_size * comp->num_output_ptr;\r
-\r
- if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)\r
- text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out;\r
-\r
- return((int)text_len);\r
-}\r
-\r
-/* Ship the compressed text out via chunk writes */\r
-static void /* PRIVATE */\r
-png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)\r
-{\r
- int i;\r
-\r
- /* Handle the no-compression case */\r
- if (comp->input)\r
- {\r
- png_write_chunk_data(png_ptr, comp->input, comp->input_len);\r
-\r
- return;\r
- }\r
-\r
-#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED\r
- /* The zbuf_size test is because the code below doesn't work if zbuf_size is\r
- * '1'; simply skip it to avoid memory overwrite.\r
- */\r
- if (comp->input_len >= 2 && comp->input_len < 16384 && png_ptr->zbuf_size > 1)\r
- {\r
- unsigned int z_cmf; /* zlib compression method and flags */\r
-\r
- /* Optimize the CMF field in the zlib stream. This hack of the zlib\r
- * stream is compliant to the stream specification.\r
- */\r
-\r
- if (comp->num_output_ptr)\r
- z_cmf = comp->output_ptr[0][0];\r
- else\r
- z_cmf = png_ptr->zbuf[0];\r
-\r
- if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)\r
- {\r
- unsigned int z_cinfo;\r
- unsigned int half_z_window_size;\r
- png_size_t uncompressed_text_size = comp->input_len;\r
-\r
- z_cinfo = z_cmf >> 4;\r
- half_z_window_size = 1 << (z_cinfo + 7);\r
-\r
- while (uncompressed_text_size <= half_z_window_size &&\r
- half_z_window_size >= 256)\r
- {\r
- z_cinfo--;\r
- half_z_window_size >>= 1;\r
- }\r
-\r
- z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4);\r
-\r
- if (comp->num_output_ptr)\r
- {\r
-\r
- if (comp->output_ptr[0][0] != z_cmf)\r
- {\r
- int tmp;\r
-\r
- comp->output_ptr[0][0] = (png_byte)z_cmf;\r
- tmp = comp->output_ptr[0][1] & 0xe0;\r
- tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f;\r
- comp->output_ptr[0][1] = (png_byte)tmp;\r
- }\r
- }\r
- else\r
- {\r
- int tmp;\r
-\r
- png_ptr->zbuf[0] = (png_byte)z_cmf;\r
- tmp = png_ptr->zbuf[1] & 0xe0;\r
- tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f;\r
- png_ptr->zbuf[1] = (png_byte)tmp;\r
- }\r
- }\r
-\r
- else\r
- png_error(png_ptr,\r
- "Invalid zlib compression method or flags in non-IDAT chunk");\r
- }\r
-#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */\r
-\r
- /* Write saved output buffers, if any */\r
- for (i = 0; i < comp->num_output_ptr; i++)\r
- {\r
- png_write_chunk_data(png_ptr, comp->output_ptr[i],\r
- (png_size_t)png_ptr->zbuf_size);\r
-\r
- png_free(png_ptr, comp->output_ptr[i]);\r
- }\r
-\r
- if (comp->max_output_ptr != 0)\r
- png_free(png_ptr, comp->output_ptr);\r
-\r
- /* Write anything left in zbuf */\r
- if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)\r
- png_write_chunk_data(png_ptr, png_ptr->zbuf,\r
- (png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out));\r
-\r
- /* Reset zlib for another zTXt/iTXt or image data */\r
- png_zlib_release(png_ptr);\r
-}\r
-#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */\r
-\r
-/* Write the IHDR chunk, and update the png_struct with the necessary\r
- * information. Note that the rest of this code depends upon this\r
- * information being correct.\r
- */\r
-void /* PRIVATE */\r
-png_write_IHDR(png_structp png_ptr, png_uint_32 width, png_uint_32 height,\r
- int bit_depth, int color_type, int compression_type, int filter_type,\r
- int interlace_type)\r
-{\r
- png_byte buf[13]; /* Buffer to store the IHDR info */\r
-\r
- png_debug(1, "in png_write_IHDR");\r
-\r
- /* Check that we have valid input data from the application info */\r
- switch (color_type)\r
- {\r
- case PNG_COLOR_TYPE_GRAY:\r
- switch (bit_depth)\r
- {\r
- case 1:\r
- case 2:\r
- case 4:\r
- case 8:\r
-#ifdef PNG_WRITE_16BIT_SUPPORTED\r
- case 16:\r
-#endif\r
- png_ptr->channels = 1; break;\r
-\r
- default:\r
- png_error(png_ptr,\r
- "Invalid bit depth for grayscale image");\r
- }\r
- break;\r
-\r
- case PNG_COLOR_TYPE_RGB:\r
-#ifdef PNG_WRITE_16BIT_SUPPORTED\r
- if (bit_depth != 8 && bit_depth != 16)\r
-#else\r
- if (bit_depth != 8)\r
-#endif\r
- png_error(png_ptr, "Invalid bit depth for RGB image");\r
-\r
- png_ptr->channels = 3;\r
- break;\r
-\r
- case PNG_COLOR_TYPE_PALETTE:\r
- switch (bit_depth)\r
- {\r
- case 1:\r
- case 2:\r
- case 4:\r
- case 8:\r
- png_ptr->channels = 1;\r
- break;\r
-\r
- default:\r
- png_error(png_ptr, "Invalid bit depth for paletted image");\r
- }\r
- break;\r
-\r
- case PNG_COLOR_TYPE_GRAY_ALPHA:\r
- if (bit_depth != 8 && bit_depth != 16)\r
- png_error(png_ptr, "Invalid bit depth for grayscale+alpha image");\r
-\r
- png_ptr->channels = 2;\r
- break;\r
-\r
- case PNG_COLOR_TYPE_RGB_ALPHA:\r
-#ifdef PNG_WRITE_16BIT_SUPPORTED\r
- if (bit_depth != 8 && bit_depth != 16)\r
-#else\r
- if (bit_depth != 8)\r
-#endif\r
- png_error(png_ptr, "Invalid bit depth for RGBA image");\r
-\r
- png_ptr->channels = 4;\r
- break;\r
-\r
- default:\r
- png_error(png_ptr, "Invalid image color type specified");\r
- }\r
-\r
- if (compression_type != PNG_COMPRESSION_TYPE_BASE)\r
- {\r
- png_warning(png_ptr, "Invalid compression type specified");\r
- compression_type = PNG_COMPRESSION_TYPE_BASE;\r
- }\r
-\r
- /* Write filter_method 64 (intrapixel differencing) only if\r
- * 1. Libpng was compiled with PNG_MNG_FEATURES_SUPPORTED and\r
- * 2. Libpng did not write a PNG signature (this filter_method is only\r
- * used in PNG datastreams that are embedded in MNG datastreams) and\r
- * 3. The application called png_permit_mng_features with a mask that\r
- * included PNG_FLAG_MNG_FILTER_64 and\r
- * 4. The filter_method is 64 and\r
- * 5. The color_type is RGB or RGBA\r
- */\r
- if (\r
-#ifdef PNG_MNG_FEATURES_SUPPORTED\r
- !((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&\r
- ((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&\r
- (color_type == PNG_COLOR_TYPE_RGB ||\r
- color_type == PNG_COLOR_TYPE_RGB_ALPHA) &&\r
- (filter_type == PNG_INTRAPIXEL_DIFFERENCING)) &&\r
-#endif\r
- filter_type != PNG_FILTER_TYPE_BASE)\r
- {\r
- png_warning(png_ptr, "Invalid filter type specified");\r
- filter_type = PNG_FILTER_TYPE_BASE;\r
- }\r
-\r
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED\r
- if (interlace_type != PNG_INTERLACE_NONE &&\r
- interlace_type != PNG_INTERLACE_ADAM7)\r
- {\r
- png_warning(png_ptr, "Invalid interlace type specified");\r
- interlace_type = PNG_INTERLACE_ADAM7;\r
- }\r
-#else\r
- interlace_type=PNG_INTERLACE_NONE;\r
-#endif\r
-\r
- /* Save the relevent information */\r
- png_ptr->bit_depth = (png_byte)bit_depth;\r
- png_ptr->color_type = (png_byte)color_type;\r
- png_ptr->interlaced = (png_byte)interlace_type;\r
-#ifdef PNG_MNG_FEATURES_SUPPORTED\r
- png_ptr->filter_type = (png_byte)filter_type;\r
-#endif\r
- png_ptr->compression_type = (png_byte)compression_type;\r
- png_ptr->width = width;\r
- png_ptr->height = height;\r
-\r
- png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);\r
- png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);\r
- /* Set the usr info, so any transformations can modify it */\r
- png_ptr->usr_width = png_ptr->width;\r
- png_ptr->usr_bit_depth = png_ptr->bit_depth;\r
- png_ptr->usr_channels = png_ptr->channels;\r
-\r
- /* Pack the header information into the buffer */\r
- png_save_uint_32(buf, width);\r
- png_save_uint_32(buf + 4, height);\r
- buf[8] = (png_byte)bit_depth;\r
- buf[9] = (png_byte)color_type;\r
- buf[10] = (png_byte)compression_type;\r
- buf[11] = (png_byte)filter_type;\r
- buf[12] = (png_byte)interlace_type;\r
-\r
- /* Write the chunk */\r
- png_write_complete_chunk(png_ptr, png_IHDR, buf, (png_size_t)13);\r
-\r
- /* Initialize zlib with PNG info */\r
- png_ptr->zstream.zalloc = png_zalloc;\r
- png_ptr->zstream.zfree = png_zfree;\r
- png_ptr->zstream.opaque = (voidpf)png_ptr;\r
-\r
- if (!(png_ptr->do_filter))\r
- {\r
- if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE ||\r
- png_ptr->bit_depth < 8)\r
- png_ptr->do_filter = PNG_FILTER_NONE;\r
-\r
- else\r
- png_ptr->do_filter = PNG_ALL_FILTERS;\r
- }\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_STRATEGY))\r
- {\r
- if (png_ptr->do_filter != PNG_FILTER_NONE)\r
- png_ptr->zlib_strategy = Z_FILTERED;\r
-\r
- else\r
- png_ptr->zlib_strategy = Z_DEFAULT_STRATEGY;\r
- }\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_LEVEL))\r
- png_ptr->zlib_level = Z_DEFAULT_COMPRESSION;\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_MEM_LEVEL))\r
- png_ptr->zlib_mem_level = 8;\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_WINDOW_BITS))\r
- png_ptr->zlib_window_bits = 15;\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZLIB_CUSTOM_METHOD))\r
- png_ptr->zlib_method = 8;\r
-\r
-#ifdef PNG_WRITE_COMPRESSED_TEXT_SUPPORTED\r
-#ifdef PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED\r
- if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_STRATEGY))\r
- png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY;\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_LEVEL))\r
- png_ptr->zlib_text_level = png_ptr->zlib_level;\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_MEM_LEVEL))\r
- png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level;\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_WINDOW_BITS))\r
- png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits;\r
-\r
- if (!(png_ptr->flags & PNG_FLAG_ZTXT_CUSTOM_METHOD))\r
- png_ptr->zlib_text_method = png_ptr->zlib_method;\r
-#else\r
- png_ptr->zlib_text_strategy = Z_DEFAULT_STRATEGY;\r
- png_ptr->zlib_text_level = png_ptr->zlib_level;\r
- png_ptr->zlib_text_mem_level = png_ptr->zlib_mem_level;\r
- png_ptr->zlib_text_window_bits = png_ptr->zlib_window_bits;\r
- png_ptr->zlib_text_method = png_ptr->zlib_method;\r
-#endif /* PNG_WRITE_CUSTOMIZE_ZTXT_COMPRESSION_SUPPORTED */\r
-#endif /* PNG_WRITE_COMPRESSED_TEXT_SUPPORTED */\r
-\r
- /* Record that the compressor has not yet been initialized. */\r
- png_ptr->zlib_state = PNG_ZLIB_UNINITIALIZED;\r
-\r
- png_ptr->mode = PNG_HAVE_IHDR; /* not READY_FOR_ZTXT */\r
-}\r
-\r
-/* Write the palette. We are careful not to trust png_color to be in the\r
- * correct order for PNG, so people can redefine it to any convenient\r
- * structure.\r
- */\r
-void /* PRIVATE */\r
-png_write_PLTE(png_structp png_ptr, png_const_colorp palette,\r
- png_uint_32 num_pal)\r
-{\r
- png_uint_32 i;\r
- png_const_colorp pal_ptr;\r
- png_byte buf[3];\r
-\r
- png_debug(1, "in png_write_PLTE");\r
-\r
- if ((\r
-#ifdef PNG_MNG_FEATURES_SUPPORTED\r
- !(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&\r
-#endif\r
- num_pal == 0) || num_pal > 256)\r
- {\r
- if (png_ptr->color_type == PNG_COLOR_TYPE_PALETTE)\r
- {\r
- png_error(png_ptr, "Invalid number of colors in palette");\r
- }\r
-\r
- else\r
- {\r
- png_warning(png_ptr, "Invalid number of colors in palette");\r
- return;\r
- }\r
- }\r
-\r
- if (!(png_ptr->color_type&PNG_COLOR_MASK_COLOR))\r
- {\r
- png_warning(png_ptr,\r
- "Ignoring request to write a PLTE chunk in grayscale PNG");\r
-\r
- return;\r
- }\r
-\r
- png_ptr->num_palette = (png_uint_16)num_pal;\r
- png_debug1(3, "num_palette = %d", png_ptr->num_palette);\r
-\r
- png_write_chunk_header(png_ptr, png_PLTE, (png_uint_32)(num_pal * 3));\r
-#ifdef PNG_POINTER_INDEXING_SUPPORTED\r
-\r
- for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)\r
- {\r
- buf[0] = pal_ptr->red;\r
- buf[1] = pal_ptr->green;\r
- buf[2] = pal_ptr->blue;\r
- png_write_chunk_data(png_ptr, buf, (png_size_t)3);\r
- }\r
-\r
-#else\r
- /* This is a little slower but some buggy compilers need to do this\r
- * instead\r
- */\r
- pal_ptr=palette;\r
-\r
- for (i = 0; i < num_pal; i++)\r
- {\r
- buf[0] = pal_ptr[i].red;\r
- buf[1] = pal_ptr[i].green;\r
- buf[2] = pal_ptr[i].blue;\r
- png_write_chunk_data(png_ptr, buf, (png_size_t)3);\r
- }\r
-\r
-#endif\r
- png_write_chunk_end(png_ptr);\r
- png_ptr->mode |= PNG_HAVE_PLTE;\r
-}\r
-\r
-/* Write an IDAT chunk */\r
-void /* PRIVATE */\r
-png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)\r
-{\r
- png_debug(1, "in png_write_IDAT");\r
-\r
-#ifdef PNG_WRITE_OPTIMIZE_CMF_SUPPORTED\r
- if (!(png_ptr->mode & PNG_HAVE_IDAT) &&\r
- png_ptr->compression_type == PNG_COMPRESSION_TYPE_BASE)\r
- {\r
- /* Optimize the CMF field in the zlib stream. This hack of the zlib\r
- * stream is compliant to the stream specification.\r
- */\r
- unsigned int z_cmf = data[0]; /* zlib compression method and flags */\r
-\r
- if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)\r
- {\r
- /* Avoid memory underflows and multiplication overflows.\r
- *\r
- * The conditions below are practically always satisfied;\r
- * however, they still must be checked.\r
- */\r
- if (length >= 2 &&\r
- png_ptr->height < 16384 && png_ptr->width < 16384)\r
- {\r
- /* Compute the maximum possible length of the datastream */\r
-\r
- /* Number of pixels, plus for each row a filter byte\r
- * and possibly a padding byte, so increase the maximum\r
- * size to account for these.\r
- */\r
- unsigned int z_cinfo;\r
- unsigned int half_z_window_size;\r
- png_uint_32 uncompressed_idat_size = png_ptr->height *\r
- ((png_ptr->width *\r
- png_ptr->channels * png_ptr->bit_depth + 15) >> 3);\r
-\r
- /* If it's interlaced, each block of 8 rows is sent as up to\r
- * 14 rows, i.e., 6 additional rows, each with a filter byte\r
- * and possibly a padding byte\r
- */\r
- if (png_ptr->interlaced)\r
- uncompressed_idat_size += ((png_ptr->height + 7)/8) *\r
- (png_ptr->bit_depth < 8 ? 12 : 6);\r
-\r
- z_cinfo = z_cmf >> 4;\r
- half_z_window_size = 1 << (z_cinfo + 7);\r
-\r
- while (uncompressed_idat_size <= half_z_window_size &&\r
- half_z_window_size >= 256)\r
- {\r
- z_cinfo--;\r
- half_z_window_size >>= 1;\r
- }\r
-\r
- z_cmf = (z_cmf & 0x0f) | (z_cinfo << 4);\r
-\r
- if (data[0] != z_cmf)\r
- {\r
- int tmp;\r
- data[0] = (png_byte)z_cmf;\r
- tmp = data[1] & 0xe0;\r
- tmp += 0x1f - ((z_cmf << 8) + tmp) % 0x1f;\r
- data[1] = (png_byte)tmp;\r
- }\r
- }\r
- }\r
-\r
- else\r
- png_error(png_ptr,\r
- "Invalid zlib compression method or flags in IDAT");\r
- }\r
-#endif /* PNG_WRITE_OPTIMIZE_CMF_SUPPORTED */\r
-\r
- png_write_complete_chunk(png_ptr, png_IDAT, data, length);\r
- png_ptr->mode |= PNG_HAVE_IDAT;\r
-\r
- /* Prior to 1.5.4 this code was replicated in every caller (except at the\r
- * end, where it isn't technically necessary). Since this function has\r
- * flushed the data we can safely reset the zlib output buffer here.\r
- */\r
- png_ptr->zstream.next_out = png_ptr->zbuf;\r
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;\r
-}\r
-\r
-/* Write an IEND chunk */\r
-void /* PRIVATE */\r
-png_write_IEND(png_structp png_ptr)\r
-{\r
- png_debug(1, "in png_write_IEND");\r
-\r
- png_write_complete_chunk(png_ptr, png_IEND, NULL, (png_size_t)0);\r
- png_ptr->mode |= PNG_HAVE_IEND;\r
-}\r
-\r
-#ifdef PNG_WRITE_gAMA_SUPPORTED\r
-/* Write a gAMA chunk */\r
-void /* PRIVATE */\r
-png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)\r
-{\r
- png_byte buf[4];\r
-\r
- png_debug(1, "in png_write_gAMA");\r
-\r
- /* file_gamma is saved in 1/100,000ths */\r
- png_save_uint_32(buf, (png_uint_32)file_gamma);\r
- png_write_complete_chunk(png_ptr, png_gAMA, buf, (png_size_t)4);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_sRGB_SUPPORTED\r
-/* Write a sRGB chunk */\r
-void /* PRIVATE */\r
-png_write_sRGB(png_structp png_ptr, int srgb_intent)\r
-{\r
- png_byte buf[1];\r
-\r
- png_debug(1, "in png_write_sRGB");\r
-\r
- if (srgb_intent >= PNG_sRGB_INTENT_LAST)\r
- png_warning(png_ptr,\r
- "Invalid sRGB rendering intent specified");\r
-\r
- buf[0]=(png_byte)srgb_intent;\r
- png_write_complete_chunk(png_ptr, png_sRGB, buf, (png_size_t)1);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_iCCP_SUPPORTED\r
-/* Write an iCCP chunk */\r
-void /* PRIVATE */\r
-png_write_iCCP(png_structp png_ptr, png_const_charp name, int compression_type,\r
- png_const_charp profile, int profile_len)\r
-{\r
- png_size_t name_len;\r
- png_charp new_name;\r
- compression_state comp;\r
- int embedded_profile_len = 0;\r
-\r
- png_debug(1, "in png_write_iCCP");\r
-\r
- comp.num_output_ptr = 0;\r
- comp.max_output_ptr = 0;\r
- comp.output_ptr = NULL;\r
- comp.input = NULL;\r
- comp.input_len = 0;\r
-\r
- if ((name_len = png_check_keyword(png_ptr, name, &new_name)) == 0)\r
- return;\r
-\r
- if (compression_type != PNG_COMPRESSION_TYPE_BASE)\r
- png_warning(png_ptr, "Unknown compression type in iCCP chunk");\r
-\r
- if (profile == NULL)\r
- profile_len = 0;\r
-\r
- if (profile_len > 3)\r
- embedded_profile_len =\r
- ((*( (png_const_bytep)profile ))<<24) |\r
- ((*( (png_const_bytep)profile + 1))<<16) |\r
- ((*( (png_const_bytep)profile + 2))<< 8) |\r
- ((*( (png_const_bytep)profile + 3)) );\r
-\r
- if (embedded_profile_len < 0)\r
- {\r
- png_warning(png_ptr,\r
- "Embedded profile length in iCCP chunk is negative");\r
-\r
- png_free(png_ptr, new_name);\r
- return;\r
- }\r
-\r
- if (profile_len < embedded_profile_len)\r
- {\r
- png_warning(png_ptr,\r
- "Embedded profile length too large in iCCP chunk");\r
-\r
- png_free(png_ptr, new_name);\r
- return;\r
- }\r
-\r
- if (profile_len > embedded_profile_len)\r
- {\r
- png_warning(png_ptr,\r
- "Truncating profile to actual length in iCCP chunk");\r
-\r
- profile_len = embedded_profile_len;\r
- }\r
-\r
- if (profile_len)\r
- profile_len = png_text_compress(png_ptr, profile,\r
- (png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp);\r
-\r
- /* Make sure we include the NULL after the name and the compression type */\r
- png_write_chunk_header(png_ptr, png_iCCP,\r
- (png_uint_32)(name_len + profile_len + 2));\r
-\r
- new_name[name_len + 1] = 0x00;\r
-\r
- png_write_chunk_data(png_ptr, (png_bytep)new_name,\r
- (png_size_t)(name_len + 2));\r
-\r
- if (profile_len)\r
- {\r
- comp.input_len = profile_len;\r
- png_write_compressed_data_out(png_ptr, &comp);\r
- }\r
-\r
- png_write_chunk_end(png_ptr);\r
- png_free(png_ptr, new_name);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_sPLT_SUPPORTED\r
-/* Write a sPLT chunk */\r
-void /* PRIVATE */\r
-png_write_sPLT(png_structp png_ptr, png_const_sPLT_tp spalette)\r
-{\r
- png_size_t name_len;\r
- png_charp new_name;\r
- png_byte entrybuf[10];\r
- png_size_t entry_size = (spalette->depth == 8 ? 6 : 10);\r
- png_size_t palette_size = entry_size * spalette->nentries;\r
- png_sPLT_entryp ep;\r
-#ifndef PNG_POINTER_INDEXING_SUPPORTED\r
- int i;\r
-#endif\r
-\r
- png_debug(1, "in png_write_sPLT");\r
-\r
- if ((name_len = png_check_keyword(png_ptr,spalette->name, &new_name))==0)\r
- return;\r
-\r
- /* Make sure we include the NULL after the name */\r
- png_write_chunk_header(png_ptr, png_sPLT,\r
- (png_uint_32)(name_len + 2 + palette_size));\r
-\r
- png_write_chunk_data(png_ptr, (png_bytep)new_name,\r
- (png_size_t)(name_len + 1));\r
-\r
- png_write_chunk_data(png_ptr, &spalette->depth, (png_size_t)1);\r
-\r
- /* Loop through each palette entry, writing appropriately */\r
-#ifdef PNG_POINTER_INDEXING_SUPPORTED\r
- for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++)\r
- {\r
- if (spalette->depth == 8)\r
- {\r
- entrybuf[0] = (png_byte)ep->red;\r
- entrybuf[1] = (png_byte)ep->green;\r
- entrybuf[2] = (png_byte)ep->blue;\r
- entrybuf[3] = (png_byte)ep->alpha;\r
- png_save_uint_16(entrybuf + 4, ep->frequency);\r
- }\r
-\r
- else\r
- {\r
- png_save_uint_16(entrybuf + 0, ep->red);\r
- png_save_uint_16(entrybuf + 2, ep->green);\r
- png_save_uint_16(entrybuf + 4, ep->blue);\r
- png_save_uint_16(entrybuf + 6, ep->alpha);\r
- png_save_uint_16(entrybuf + 8, ep->frequency);\r
- }\r
-\r
- png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);\r
- }\r
-#else\r
- ep=spalette->entries;\r
- for (i = 0; i>spalette->nentries; i++)\r
- {\r
- if (spalette->depth == 8)\r
- {\r
- entrybuf[0] = (png_byte)ep[i].red;\r
- entrybuf[1] = (png_byte)ep[i].green;\r
- entrybuf[2] = (png_byte)ep[i].blue;\r
- entrybuf[3] = (png_byte)ep[i].alpha;\r
- png_save_uint_16(entrybuf + 4, ep[i].frequency);\r
- }\r
-\r
- else\r
- {\r
- png_save_uint_16(entrybuf + 0, ep[i].red);\r
- png_save_uint_16(entrybuf + 2, ep[i].green);\r
- png_save_uint_16(entrybuf + 4, ep[i].blue);\r
- png_save_uint_16(entrybuf + 6, ep[i].alpha);\r
- png_save_uint_16(entrybuf + 8, ep[i].frequency);\r
- }\r
-\r
- png_write_chunk_data(png_ptr, entrybuf, (png_size_t)entry_size);\r
- }\r
-#endif\r
-\r
- png_write_chunk_end(png_ptr);\r
- png_free(png_ptr, new_name);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_sBIT_SUPPORTED\r
-/* Write the sBIT chunk */\r
-void /* PRIVATE */\r
-png_write_sBIT(png_structp png_ptr, png_const_color_8p sbit, int color_type)\r
-{\r
- png_byte buf[4];\r
- png_size_t size;\r
-\r
- png_debug(1, "in png_write_sBIT");\r
-\r
- /* Make sure we don't depend upon the order of PNG_COLOR_8 */\r
- if (color_type & PNG_COLOR_MASK_COLOR)\r
- {\r
- png_byte maxbits;\r
-\r
- maxbits = (png_byte)(color_type==PNG_COLOR_TYPE_PALETTE ? 8 :\r
- png_ptr->usr_bit_depth);\r
-\r
- if (sbit->red == 0 || sbit->red > maxbits ||\r
- sbit->green == 0 || sbit->green > maxbits ||\r
- sbit->blue == 0 || sbit->blue > maxbits)\r
- {\r
- png_warning(png_ptr, "Invalid sBIT depth specified");\r
- return;\r
- }\r
-\r
- buf[0] = sbit->red;\r
- buf[1] = sbit->green;\r
- buf[2] = sbit->blue;\r
- size = 3;\r
- }\r
-\r
- else\r
- {\r
- if (sbit->gray == 0 || sbit->gray > png_ptr->usr_bit_depth)\r
- {\r
- png_warning(png_ptr, "Invalid sBIT depth specified");\r
- return;\r
- }\r
-\r
- buf[0] = sbit->gray;\r
- size = 1;\r
- }\r
-\r
- if (color_type & PNG_COLOR_MASK_ALPHA)\r
- {\r
- if (sbit->alpha == 0 || sbit->alpha > png_ptr->usr_bit_depth)\r
- {\r
- png_warning(png_ptr, "Invalid sBIT depth specified");\r
- return;\r
- }\r
-\r
- buf[size++] = sbit->alpha;\r
- }\r
-\r
- png_write_complete_chunk(png_ptr, png_sBIT, buf, size);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_cHRM_SUPPORTED\r
-/* Write the cHRM chunk */\r
-void /* PRIVATE */\r
-png_write_cHRM_fixed(png_structp png_ptr, png_fixed_point white_x,\r
- png_fixed_point white_y, png_fixed_point red_x, png_fixed_point red_y,\r
- png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,\r
- png_fixed_point blue_y)\r
-{\r
- png_byte buf[32];\r
-\r
- png_debug(1, "in png_write_cHRM");\r
-\r
- /* Each value is saved in 1/100,000ths */\r
-#ifdef PNG_CHECK_cHRM_SUPPORTED\r
- if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y,\r
- green_x, green_y, blue_x, blue_y))\r
-#endif\r
- {\r
- png_save_uint_32(buf, (png_uint_32)white_x);\r
- png_save_uint_32(buf + 4, (png_uint_32)white_y);\r
-\r
- png_save_uint_32(buf + 8, (png_uint_32)red_x);\r
- png_save_uint_32(buf + 12, (png_uint_32)red_y);\r
-\r
- png_save_uint_32(buf + 16, (png_uint_32)green_x);\r
- png_save_uint_32(buf + 20, (png_uint_32)green_y);\r
-\r
- png_save_uint_32(buf + 24, (png_uint_32)blue_x);\r
- png_save_uint_32(buf + 28, (png_uint_32)blue_y);\r
-\r
- png_write_complete_chunk(png_ptr, png_cHRM, buf, (png_size_t)32);\r
- }\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_tRNS_SUPPORTED\r
-/* Write the tRNS chunk */\r
-void /* PRIVATE */\r
-png_write_tRNS(png_structp png_ptr, png_const_bytep trans_alpha,\r
- png_const_color_16p tran, int num_trans, int color_type)\r
-{\r
- png_byte buf[6];\r
-\r
- png_debug(1, "in png_write_tRNS");\r
-\r
- if (color_type == PNG_COLOR_TYPE_PALETTE)\r
- {\r
- if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)\r
- {\r
- png_warning(png_ptr, "Invalid number of transparent colors specified");\r
- return;\r
- }\r
-\r
- /* Write the chunk out as it is */\r
- png_write_complete_chunk(png_ptr, png_tRNS, trans_alpha, (png_size_t)num_trans);\r
- }\r
-\r
- else if (color_type == PNG_COLOR_TYPE_GRAY)\r
- {\r
- /* One 16 bit value */\r
- if (tran->gray >= (1 << png_ptr->bit_depth))\r
- {\r
- png_warning(png_ptr,\r
- "Ignoring attempt to write tRNS chunk out-of-range for bit_depth");\r
-\r
- return;\r
- }\r
-\r
- png_save_uint_16(buf, tran->gray);\r
- png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)2);\r
- }\r
-\r
- else if (color_type == PNG_COLOR_TYPE_RGB)\r
- {\r
- /* Three 16 bit values */\r
- png_save_uint_16(buf, tran->red);\r
- png_save_uint_16(buf + 2, tran->green);\r
- png_save_uint_16(buf + 4, tran->blue);\r
-#ifdef PNG_WRITE_16BIT_SUPPORTED\r
- if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))\r
-#else\r
- if (buf[0] | buf[2] | buf[4])\r
-#endif\r
- {\r
- png_warning(png_ptr,\r
- "Ignoring attempt to write 16-bit tRNS chunk when bit_depth is 8");\r
- return;\r
- }\r
-\r
- png_write_complete_chunk(png_ptr, png_tRNS, buf, (png_size_t)6);\r
- }\r
-\r
- else\r
- {\r
- png_warning(png_ptr, "Can't write tRNS with an alpha channel");\r
- }\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_bKGD_SUPPORTED\r
-/* Write the background chunk */\r
-void /* PRIVATE */\r
-png_write_bKGD(png_structp png_ptr, png_const_color_16p back, int color_type)\r
-{\r
- png_byte buf[6];\r
-\r
- png_debug(1, "in png_write_bKGD");\r
-\r
- if (color_type == PNG_COLOR_TYPE_PALETTE)\r
- {\r
- if (\r
-#ifdef PNG_MNG_FEATURES_SUPPORTED\r
- (png_ptr->num_palette ||\r
- (!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&\r
-#endif\r
- back->index >= png_ptr->num_palette)\r
- {\r
- png_warning(png_ptr, "Invalid background palette index");\r
- return;\r
- }\r
-\r
- buf[0] = back->index;\r
- png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)1);\r
- }\r
-\r
- else if (color_type & PNG_COLOR_MASK_COLOR)\r
- {\r
- png_save_uint_16(buf, back->red);\r
- png_save_uint_16(buf + 2, back->green);\r
- png_save_uint_16(buf + 4, back->blue);\r
-#ifdef PNG_WRITE_16BIT_SUPPORTED\r
- if (png_ptr->bit_depth == 8 && (buf[0] | buf[2] | buf[4]))\r
-#else\r
- if (buf[0] | buf[2] | buf[4])\r
-#endif\r
- {\r
- png_warning(png_ptr,\r
- "Ignoring attempt to write 16-bit bKGD chunk when bit_depth is 8");\r
-\r
- return;\r
- }\r
-\r
- png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)6);\r
- }\r
-\r
- else\r
- {\r
- if (back->gray >= (1 << png_ptr->bit_depth))\r
- {\r
- png_warning(png_ptr,\r
- "Ignoring attempt to write bKGD chunk out-of-range for bit_depth");\r
-\r
- return;\r
- }\r
-\r
- png_save_uint_16(buf, back->gray);\r
- png_write_complete_chunk(png_ptr, png_bKGD, buf, (png_size_t)2);\r
- }\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_hIST_SUPPORTED\r
-/* Write the histogram */\r
-void /* PRIVATE */\r
-png_write_hIST(png_structp png_ptr, png_const_uint_16p hist, int num_hist)\r
-{\r
- int i;\r
- png_byte buf[3];\r
-\r
- png_debug(1, "in png_write_hIST");\r
-\r
- if (num_hist > (int)png_ptr->num_palette)\r
- {\r
- png_debug2(3, "num_hist = %d, num_palette = %d", num_hist,\r
- png_ptr->num_palette);\r
-\r
- png_warning(png_ptr, "Invalid number of histogram entries specified");\r
- return;\r
- }\r
-\r
- png_write_chunk_header(png_ptr, png_hIST, (png_uint_32)(num_hist * 2));\r
-\r
- for (i = 0; i < num_hist; i++)\r
- {\r
- png_save_uint_16(buf, hist[i]);\r
- png_write_chunk_data(png_ptr, buf, (png_size_t)2);\r
- }\r
-\r
- png_write_chunk_end(png_ptr);\r
-}\r
-#endif\r
-\r
-#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_pCAL_SUPPORTED) || \\r
- defined(PNG_WRITE_iCCP_SUPPORTED) || defined(PNG_WRITE_sPLT_SUPPORTED)\r
-/* Check that the tEXt or zTXt keyword is valid per PNG 1.0 specification,\r
- * and if invalid, correct the keyword rather than discarding the entire\r
- * chunk. The PNG 1.0 specification requires keywords 1-79 characters in\r
- * length, forbids leading or trailing whitespace, multiple internal spaces,\r
- * and the non-break space (0x80) from ISO 8859-1. Returns keyword length.\r
- *\r
- * The new_key is allocated to hold the corrected keyword and must be freed\r
- * by the calling routine. This avoids problems with trying to write to\r
- * static keywords without having to have duplicate copies of the strings.\r
- */\r
-png_size_t /* PRIVATE */\r
-png_check_keyword(png_structp png_ptr, png_const_charp key, png_charpp new_key)\r
-{\r
- png_size_t key_len;\r
- png_const_charp ikp;\r
- png_charp kp, dp;\r
- int kflag;\r
- int kwarn=0;\r
-\r
- png_debug(1, "in png_check_keyword");\r
-\r
- *new_key = NULL;\r
-\r
- if (key == NULL || (key_len = png_strlen(key)) == 0)\r
- {\r
- png_warning(png_ptr, "zero length keyword");\r
- return ((png_size_t)0);\r
- }\r
-\r
- png_debug1(2, "Keyword to be checked is '%s'", key);\r
-\r
- *new_key = (png_charp)png_malloc_warn(png_ptr, (png_uint_32)(key_len + 2));\r
-\r
- if (*new_key == NULL)\r
- {\r
- png_warning(png_ptr, "Out of memory while procesing keyword");\r
- return ((png_size_t)0);\r
- }\r
-\r
- /* Replace non-printing characters with a blank and print a warning */\r
- for (ikp = key, dp = *new_key; *ikp != '\0'; ikp++, dp++)\r
- {\r
- if ((png_byte)*ikp < 0x20 ||\r
- ((png_byte)*ikp > 0x7E && (png_byte)*ikp < 0xA1))\r
- {\r
- PNG_WARNING_PARAMETERS(p)\r
-\r
- png_warning_parameter_unsigned(p, 1, PNG_NUMBER_FORMAT_02x,\r
- (png_byte)*ikp);\r
- png_formatted_warning(png_ptr, p, "invalid keyword character 0x@1");\r
- *dp = ' ';\r
- }\r
-\r
- else\r
- {\r
- *dp = *ikp;\r
- }\r
- }\r
- *dp = '\0';\r
-\r
- /* Remove any trailing white space. */\r
- kp = *new_key + key_len - 1;\r
- if (*kp == ' ')\r
- {\r
- png_warning(png_ptr, "trailing spaces removed from keyword");\r
-\r
- while (*kp == ' ')\r
- {\r
- *(kp--) = '\0';\r
- key_len--;\r
- }\r
- }\r
-\r
- /* Remove any leading white space. */\r
- kp = *new_key;\r
- if (*kp == ' ')\r
- {\r
- png_warning(png_ptr, "leading spaces removed from keyword");\r
-\r
- while (*kp == ' ')\r
- {\r
- kp++;\r
- key_len--;\r
- }\r
- }\r
-\r
- png_debug1(2, "Checking for multiple internal spaces in '%s'", kp);\r
-\r
- /* Remove multiple internal spaces. */\r
- for (kflag = 0, dp = *new_key; *kp != '\0'; kp++)\r
- {\r
- if (*kp == ' ' && kflag == 0)\r
- {\r
- *(dp++) = *kp;\r
- kflag = 1;\r
- }\r
-\r
- else if (*kp == ' ')\r
- {\r
- key_len--;\r
- kwarn = 1;\r
- }\r
-\r
- else\r
- {\r
- *(dp++) = *kp;\r
- kflag = 0;\r
- }\r
- }\r
- *dp = '\0';\r
- if (kwarn)\r
- png_warning(png_ptr, "extra interior spaces removed from keyword");\r
-\r
- if (key_len == 0)\r
- {\r
- png_free(png_ptr, *new_key);\r
- png_warning(png_ptr, "Zero length keyword");\r
- }\r
-\r
- if (key_len > 79)\r
- {\r
- png_warning(png_ptr, "keyword length must be 1 - 79 characters");\r
- (*new_key)[79] = '\0';\r
- key_len = 79;\r
- }\r
-\r
- return (key_len);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_tEXt_SUPPORTED\r
-/* Write a tEXt chunk */\r
-void /* PRIVATE */\r
-png_write_tEXt(png_structp png_ptr, png_const_charp key, png_const_charp text,\r
- png_size_t text_len)\r
-{\r
- png_size_t key_len;\r
- png_charp new_key;\r
-\r
- png_debug(1, "in png_write_tEXt");\r
-\r
- if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0)\r
- return;\r
-\r
- if (text == NULL || *text == '\0')\r
- text_len = 0;\r
-\r
- else\r
- text_len = png_strlen(text);\r
-\r
- /* Make sure we include the 0 after the key */\r
- png_write_chunk_header(png_ptr, png_tEXt,\r
- (png_uint_32)(key_len + text_len + 1));\r
- /*\r
- * We leave it to the application to meet PNG-1.0 requirements on the\r
- * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of\r
- * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.\r
- * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.\r
- */\r
- png_write_chunk_data(png_ptr, (png_bytep)new_key,\r
- (png_size_t)(key_len + 1));\r
-\r
- if (text_len)\r
- png_write_chunk_data(png_ptr, (png_const_bytep)text,\r
- (png_size_t)text_len);\r
-\r
- png_write_chunk_end(png_ptr);\r
- png_free(png_ptr, new_key);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_zTXt_SUPPORTED\r
-/* Write a compressed text chunk */\r
-void /* PRIVATE */\r
-png_write_zTXt(png_structp png_ptr, png_const_charp key, png_const_charp text,\r
- png_size_t text_len, int compression)\r
-{\r
- png_size_t key_len;\r
- png_byte buf;\r
- png_charp new_key;\r
- compression_state comp;\r
-\r
- png_debug(1, "in png_write_zTXt");\r
-\r
- comp.num_output_ptr = 0;\r
- comp.max_output_ptr = 0;\r
- comp.output_ptr = NULL;\r
- comp.input = NULL;\r
- comp.input_len = 0;\r
-\r
- if ((key_len = png_check_keyword(png_ptr, key, &new_key)) == 0)\r
- {\r
- png_free(png_ptr, new_key);\r
- return;\r
- }\r
-\r
- if (text == NULL || *text == '\0' || compression==PNG_TEXT_COMPRESSION_NONE)\r
- {\r
- png_write_tEXt(png_ptr, new_key, text, (png_size_t)0);\r
- png_free(png_ptr, new_key);\r
- return;\r
- }\r
-\r
- text_len = png_strlen(text);\r
-\r
- /* Compute the compressed data; do it now for the length */\r
- text_len = png_text_compress(png_ptr, text, text_len, compression,\r
- &comp);\r
-\r
- /* Write start of chunk */\r
- png_write_chunk_header(png_ptr, png_zTXt,\r
- (png_uint_32)(key_len+text_len + 2));\r
-\r
- /* Write key */\r
- png_write_chunk_data(png_ptr, (png_bytep)new_key,\r
- (png_size_t)(key_len + 1));\r
-\r
- png_free(png_ptr, new_key);\r
-\r
- buf = (png_byte)compression;\r
-\r
- /* Write compression */\r
- png_write_chunk_data(png_ptr, &buf, (png_size_t)1);\r
-\r
- /* Write the compressed data */\r
- comp.input_len = text_len;\r
- png_write_compressed_data_out(png_ptr, &comp);\r
-\r
- /* Close the chunk */\r
- png_write_chunk_end(png_ptr);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_iTXt_SUPPORTED\r
-/* Write an iTXt chunk */\r
-void /* PRIVATE */\r
-png_write_iTXt(png_structp png_ptr, int compression, png_const_charp key,\r
- png_const_charp lang, png_const_charp lang_key, png_const_charp text)\r
-{\r
- png_size_t lang_len, key_len, lang_key_len, text_len;\r
- png_charp new_lang;\r
- png_charp new_key = NULL;\r
- png_byte cbuf[2];\r
- compression_state comp;\r
-\r
- png_debug(1, "in png_write_iTXt");\r
-\r
- comp.num_output_ptr = 0;\r
- comp.max_output_ptr = 0;\r
- comp.output_ptr = NULL;\r
- comp.input = NULL;\r
-\r
- if ((key_len = png_check_keyword(png_ptr, key, &new_key)) == 0)\r
- return;\r
-\r
- if ((lang_len = png_check_keyword(png_ptr, lang, &new_lang)) == 0)\r
- {\r
- png_warning(png_ptr, "Empty language field in iTXt chunk");\r
- new_lang = NULL;\r
- lang_len = 0;\r
- }\r
-\r
- if (lang_key == NULL)\r
- lang_key_len = 0;\r
-\r
- else\r
- lang_key_len = png_strlen(lang_key);\r
-\r
- if (text == NULL)\r
- text_len = 0;\r
-\r
- else\r
- text_len = png_strlen(text);\r
-\r
- /* Compute the compressed data; do it now for the length */\r
- text_len = png_text_compress(png_ptr, text, text_len, compression - 2,\r
- &comp);\r
-\r
-\r
- /* Make sure we include the compression flag, the compression byte,\r
- * and the NULs after the key, lang, and lang_key parts\r
- */\r
-\r
- png_write_chunk_header(png_ptr, png_iTXt, (png_uint_32)(\r
- 5 /* comp byte, comp flag, terminators for key, lang and lang_key */\r
- + key_len\r
- + lang_len\r
- + lang_key_len\r
- + text_len));\r
-\r
- /* We leave it to the application to meet PNG-1.0 requirements on the\r
- * contents of the text. PNG-1.0 through PNG-1.2 discourage the use of\r
- * any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.\r
- * The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.\r
- */\r
- png_write_chunk_data(png_ptr, (png_bytep)new_key, (png_size_t)(key_len + 1));\r
-\r
- /* Set the compression flag */\r
- if (compression == PNG_ITXT_COMPRESSION_NONE ||\r
- compression == PNG_TEXT_COMPRESSION_NONE)\r
- cbuf[0] = 0;\r
-\r
- else /* compression == PNG_ITXT_COMPRESSION_zTXt */\r
- cbuf[0] = 1;\r
-\r
- /* Set the compression method */\r
- cbuf[1] = 0;\r
-\r
- png_write_chunk_data(png_ptr, cbuf, (png_size_t)2);\r
-\r
- cbuf[0] = 0;\r
- png_write_chunk_data(png_ptr, (new_lang ? (png_const_bytep)new_lang : cbuf),\r
- (png_size_t)(lang_len + 1));\r
-\r
- png_write_chunk_data(png_ptr, (lang_key ? (png_const_bytep)lang_key : cbuf),\r
- (png_size_t)(lang_key_len + 1));\r
-\r
- png_write_compressed_data_out(png_ptr, &comp);\r
-\r
- png_write_chunk_end(png_ptr);\r
-\r
- png_free(png_ptr, new_key);\r
- png_free(png_ptr, new_lang);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_oFFs_SUPPORTED\r
-/* Write the oFFs chunk */\r
-void /* PRIVATE */\r
-png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,\r
- int unit_type)\r
-{\r
- png_byte buf[9];\r
-\r
- png_debug(1, "in png_write_oFFs");\r
-\r
- if (unit_type >= PNG_OFFSET_LAST)\r
- png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");\r
-\r
- png_save_int_32(buf, x_offset);\r
- png_save_int_32(buf + 4, y_offset);\r
- buf[8] = (png_byte)unit_type;\r
-\r
- png_write_complete_chunk(png_ptr, png_oFFs, buf, (png_size_t)9);\r
-}\r
-#endif\r
-#ifdef PNG_WRITE_pCAL_SUPPORTED\r
-/* Write the pCAL chunk (described in the PNG extensions document) */\r
-void /* PRIVATE */\r
-png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,\r
- png_int_32 X1, int type, int nparams, png_const_charp units,\r
- png_charpp params)\r
-{\r
- png_size_t purpose_len, units_len, total_len;\r
- png_size_tp params_len;\r
- png_byte buf[10];\r
- png_charp new_purpose;\r
- int i;\r
-\r
- png_debug1(1, "in png_write_pCAL (%d parameters)", nparams);\r
-\r
- if (type >= PNG_EQUATION_LAST)\r
- png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");\r
-\r
- purpose_len = png_check_keyword(png_ptr, purpose, &new_purpose) + 1;\r
- png_debug1(3, "pCAL purpose length = %d", (int)purpose_len);\r
- units_len = png_strlen(units) + (nparams == 0 ? 0 : 1);\r
- png_debug1(3, "pCAL units length = %d", (int)units_len);\r
- total_len = purpose_len + units_len + 10;\r
-\r
- params_len = (png_size_tp)png_malloc(png_ptr,\r
- (png_alloc_size_t)(nparams * png_sizeof(png_size_t)));\r
-\r
- /* Find the length of each parameter, making sure we don't count the\r
- * null terminator for the last parameter.\r
- */\r
- for (i = 0; i < nparams; i++)\r
- {\r
- params_len[i] = png_strlen(params[i]) + (i == nparams - 1 ? 0 : 1);\r
- png_debug2(3, "pCAL parameter %d length = %lu", i,\r
- (unsigned long)params_len[i]);\r
- total_len += params_len[i];\r
- }\r
-\r
- png_debug1(3, "pCAL total length = %d", (int)total_len);\r
- png_write_chunk_header(png_ptr, png_pCAL, (png_uint_32)total_len);\r
- png_write_chunk_data(png_ptr, (png_const_bytep)new_purpose, purpose_len);\r
- png_save_int_32(buf, X0);\r
- png_save_int_32(buf + 4, X1);\r
- buf[8] = (png_byte)type;\r
- buf[9] = (png_byte)nparams;\r
- png_write_chunk_data(png_ptr, buf, (png_size_t)10);\r
- png_write_chunk_data(png_ptr, (png_const_bytep)units, (png_size_t)units_len);\r
-\r
- png_free(png_ptr, new_purpose);\r
-\r
- for (i = 0; i < nparams; i++)\r
- {\r
- png_write_chunk_data(png_ptr, (png_const_bytep)params[i], params_len[i]);\r
- }\r
-\r
- png_free(png_ptr, params_len);\r
- png_write_chunk_end(png_ptr);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_sCAL_SUPPORTED\r
-/* Write the sCAL chunk */\r
-void /* PRIVATE */\r
-png_write_sCAL_s(png_structp png_ptr, int unit, png_const_charp width,\r
- png_const_charp height)\r
-{\r
- png_byte buf[64];\r
- png_size_t wlen, hlen, total_len;\r
-\r
- png_debug(1, "in png_write_sCAL_s");\r
-\r
- wlen = png_strlen(width);\r
- hlen = png_strlen(height);\r
- total_len = wlen + hlen + 2;\r
-\r
- if (total_len > 64)\r
- {\r
- png_warning(png_ptr, "Can't write sCAL (buffer too small)");\r
- return;\r
- }\r
-\r
- buf[0] = (png_byte)unit;\r
- png_memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */\r
- png_memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */\r
-\r
- png_debug1(3, "sCAL total length = %u", (unsigned int)total_len);\r
- png_write_complete_chunk(png_ptr, png_sCAL, buf, total_len);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_pHYs_SUPPORTED\r
-/* Write the pHYs chunk */\r
-void /* PRIVATE */\r
-png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,\r
- png_uint_32 y_pixels_per_unit,\r
- int unit_type)\r
-{\r
- png_byte buf[9];\r
-\r
- png_debug(1, "in png_write_pHYs");\r
-\r
- if (unit_type >= PNG_RESOLUTION_LAST)\r
- png_warning(png_ptr, "Unrecognized unit type for pHYs chunk");\r
-\r
- png_save_uint_32(buf, x_pixels_per_unit);\r
- png_save_uint_32(buf + 4, y_pixels_per_unit);\r
- buf[8] = (png_byte)unit_type;\r
-\r
- png_write_complete_chunk(png_ptr, png_pHYs, buf, (png_size_t)9);\r
-}\r
-#endif\r
-\r
-#ifdef PNG_WRITE_tIME_SUPPORTED\r
-/* Write the tIME chunk. Use either png_convert_from_struct_tm()\r
- * or png_convert_from_time_t(), or fill in the structure yourself.\r
- */\r
-void /* PRIVATE */\r
-png_write_tIME(png_structp png_ptr, png_const_timep mod_time)\r
-{\r
- png_byte buf[7];\r
-\r
- png_debug(1, "in png_write_tIME");\r
-\r
- if (mod_time->month > 12 || mod_time->month < 1 ||\r
- mod_time->day > 31 || mod_time->day < 1 ||\r
- mod_time->hour > 23 || mod_time->second > 60)\r
- {\r
- png_warning(png_ptr, "Invalid time specified for tIME chunk");\r
- return;\r
- }\r
-\r
- png_save_uint_16(buf, mod_time->year);\r
- buf[2] = mod_time->month;\r
- buf[3] = mod_time->day;\r
- buf[4] = mod_time->hour;\r
- buf[5] = mod_time->minute;\r
- buf[6] = mod_time->second;\r
-\r
- png_write_complete_chunk(png_ptr, png_tIME, buf, (png_size_t)7);\r
-}\r
-#endif\r
-\r
-/* Initializes the row writing capability of libpng */\r
-void /* PRIVATE */\r
-png_write_start_row(png_structp png_ptr)\r
-{\r
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED\r
- /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */\r
-\r
- /* Start of interlace block */\r
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};\r
-\r
- /* Offset to next interlace block */\r
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};\r
-\r
- /* Start of interlace block in the y direction */\r
- static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};\r
-\r
- /* Offset to next interlace block in the y direction */\r
- static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};\r
-#endif\r
-\r
- png_alloc_size_t buf_size;\r
- int usr_pixel_depth;\r
-\r
- png_debug(1, "in png_write_start_row");\r
-\r
- usr_pixel_depth = png_ptr->usr_channels * png_ptr->usr_bit_depth;\r
- buf_size = PNG_ROWBYTES(usr_pixel_depth, png_ptr->width) + 1;\r
-\r
- /* 1.5.6: added to allow checking in the row write code. */\r
- png_ptr->transformed_pixel_depth = png_ptr->pixel_depth;\r
- png_ptr->maximum_pixel_depth = (png_byte)usr_pixel_depth;\r
-\r
- /* Set up row buffer */\r
- png_ptr->row_buf = (png_bytep)png_malloc(png_ptr, buf_size);\r
-\r
- png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;\r
-\r
-#ifdef PNG_WRITE_FILTER_SUPPORTED\r
- /* Set up filtering buffer, if using this filter */\r
- if (png_ptr->do_filter & PNG_FILTER_SUB)\r
- {\r
- png_ptr->sub_row = (png_bytep)png_malloc(png_ptr, png_ptr->rowbytes + 1);\r
-\r
- png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;\r
- }\r
-\r
- /* We only need to keep the previous row if we are using one of these. */\r
- if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))\r
- {\r
- /* Set up previous row buffer */\r
- png_ptr->prev_row = (png_bytep)png_calloc(png_ptr, buf_size);\r
-\r
- if (png_ptr->do_filter & PNG_FILTER_UP)\r
- {\r
- png_ptr->up_row = (png_bytep)png_malloc(png_ptr,\r
- png_ptr->rowbytes + 1);\r
-\r
- png_ptr->up_row[0] = PNG_FILTER_VALUE_UP;\r
- }\r
-\r
- if (png_ptr->do_filter & PNG_FILTER_AVG)\r
- {\r
- png_ptr->avg_row = (png_bytep)png_malloc(png_ptr,\r
- png_ptr->rowbytes + 1);\r
-\r
- png_ptr->avg_row[0] = PNG_FILTER_VALUE_AVG;\r
- }\r
-\r
- if (png_ptr->do_filter & PNG_FILTER_PAETH)\r
- {\r
- png_ptr->paeth_row = (png_bytep)png_malloc(png_ptr,\r
- png_ptr->rowbytes + 1);\r
-\r
- png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;\r
- }\r
- }\r
-#endif /* PNG_WRITE_FILTER_SUPPORTED */\r
-\r
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED\r
- /* If interlaced, we need to set up width and height of pass */\r
- if (png_ptr->interlaced)\r
- {\r
- if (!(png_ptr->transformations & PNG_INTERLACE))\r
- {\r
- png_ptr->num_rows = (png_ptr->height + png_pass_yinc[0] - 1 -\r
- png_pass_ystart[0]) / png_pass_yinc[0];\r
-\r
- png_ptr->usr_width = (png_ptr->width + png_pass_inc[0] - 1 -\r
- png_pass_start[0]) / png_pass_inc[0];\r
- }\r
-\r
- else\r
- {\r
- png_ptr->num_rows = png_ptr->height;\r
- png_ptr->usr_width = png_ptr->width;\r
- }\r
- }\r
-\r
- else\r
-#endif\r
- {\r
- png_ptr->num_rows = png_ptr->height;\r
- png_ptr->usr_width = png_ptr->width;\r
- }\r
-\r
- png_zlib_claim(png_ptr, PNG_ZLIB_FOR_IDAT);\r
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;\r
- png_ptr->zstream.next_out = png_ptr->zbuf;\r
-}\r
-\r
-/* Internal use only. Called when finished processing a row of data. */\r
-void /* PRIVATE */\r
-png_write_finish_row(png_structp png_ptr)\r
-{\r
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED\r
- /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */\r
-\r
- /* Start of interlace block */\r
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};\r
-\r
- /* Offset to next interlace block */\r
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};\r
-\r
- /* Start of interlace block in the y direction */\r
- static PNG_CONST png_byte png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};\r
-\r
- /* Offset to next interlace block in the y direction */\r
- static PNG_CONST png_byte png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};\r
-#endif\r
-\r
- int ret;\r
-\r
- png_debug(1, "in png_write_finish_row");\r
-\r
- /* Next row */\r
- png_ptr->row_number++;\r
-\r
- /* See if we are done */\r
- if (png_ptr->row_number < png_ptr->num_rows)\r
- return;\r
-\r
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED\r
- /* If interlaced, go to next pass */\r
- if (png_ptr->interlaced)\r
- {\r
- png_ptr->row_number = 0;\r
- if (png_ptr->transformations & PNG_INTERLACE)\r
- {\r
- png_ptr->pass++;\r
- }\r
-\r
- else\r
- {\r
- /* Loop until we find a non-zero width or height pass */\r
- do\r
- {\r
- png_ptr->pass++;\r
-\r
- if (png_ptr->pass >= 7)\r
- break;\r
-\r
- png_ptr->usr_width = (png_ptr->width +\r
- png_pass_inc[png_ptr->pass] - 1 -\r
- png_pass_start[png_ptr->pass]) /\r
- png_pass_inc[png_ptr->pass];\r
-\r
- png_ptr->num_rows = (png_ptr->height +\r
- png_pass_yinc[png_ptr->pass] - 1 -\r
- png_pass_ystart[png_ptr->pass]) /\r
- png_pass_yinc[png_ptr->pass];\r
-\r
- if (png_ptr->transformations & PNG_INTERLACE)\r
- break;\r
-\r
- } while (png_ptr->usr_width == 0 || png_ptr->num_rows == 0);\r
-\r
- }\r
-\r
- /* Reset the row above the image for the next pass */\r
- if (png_ptr->pass < 7)\r
- {\r
- if (png_ptr->prev_row != NULL)\r
- png_memset(png_ptr->prev_row, 0,\r
- (png_size_t)(PNG_ROWBYTES(png_ptr->usr_channels*\r
- png_ptr->usr_bit_depth, png_ptr->width)) + 1);\r
-\r
- return;\r
- }\r
- }\r
-#endif\r
-\r
- /* If we get here, we've just written the last row, so we need\r
- to flush the compressor */\r
- do\r
- {\r
- /* Tell the compressor we are done */\r
- ret = deflate(&png_ptr->zstream, Z_FINISH);\r
-\r
- /* Check for an error */\r
- if (ret == Z_OK)\r
- {\r
- /* Check to see if we need more room */\r
- if (!(png_ptr->zstream.avail_out))\r
- {\r
- png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);\r
- png_ptr->zstream.next_out = png_ptr->zbuf;\r
- png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;\r
- }\r
- }\r
-\r
- else if (ret != Z_STREAM_END)\r
- {\r
- if (png_ptr->zstream.msg != NULL)\r
- png_error(png_ptr, png_ptr->zstream.msg);\r
-\r
- else\r
- png_error(png_ptr, "zlib error");\r
- }\r
- } while (ret != Z_STREAM_END);\r
-\r
- /* Write any extra space */\r
- if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)\r
- {\r
- png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size -\r
- png_ptr->zstream.avail_out);\r
- }\r
-\r
- png_zlib_release(png_ptr);\r
- png_ptr->zstream.data_type = Z_BINARY;\r
-}\r
-\r
-#ifdef PNG_WRITE_INTERLACING_SUPPORTED\r
-/* Pick out the correct pixels for the interlace pass.\r
- * The basic idea here is to go through the row with a source\r
- * pointer and a destination pointer (sp and dp), and copy the\r
- * correct pixels for the pass. As the row gets compacted,\r
- * sp will always be >= dp, so we should never overwrite anything.\r
- * See the default: case for the easiest code to understand.\r
- */\r
-void /* PRIVATE */\r
-png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)\r
-{\r
- /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */\r
-\r
- /* Start of interlace block */\r
- static PNG_CONST png_byte png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};\r
-\r
- /* Offset to next interlace block */\r
- static PNG_CONST png_byte png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};\r
-\r
- png_debug(1, "in png_do_write_interlace");\r
-\r
- /* We don't have to do anything on the last pass (6) */\r
- if (pass < 6)\r
- {\r
- /* Each pixel depth is handled separately */\r
- switch (row_info->pixel_depth)\r
- {\r
- case 1:\r
- {\r
- png_bytep sp;\r
- png_bytep dp;\r
- int shift;\r
- int d;\r
- int value;\r
- png_uint_32 i;\r
- png_uint_32 row_width = row_info->width;\r
-\r
- dp = row;\r
- d = 0;\r
- shift = 7;\r
-\r
- for (i = png_pass_start[pass]; i < row_width;\r
- i += png_pass_inc[pass])\r
- {\r
- sp = row + (png_size_t)(i >> 3);\r
- value = (int)(*sp >> (7 - (int)(i & 0x07))) & 0x01;\r
- d |= (value << shift);\r
-\r
- if (shift == 0)\r
- {\r
- shift = 7;\r
- *dp++ = (png_byte)d;\r
- d = 0;\r
- }\r
-\r
- else\r
- shift--;\r
-\r
- }\r
- if (shift != 7)\r
- *dp = (png_byte)d;\r
-\r
- break;\r
- }\r
-\r
- case 2:\r
- {\r
- png_bytep sp;\r
- png_bytep dp;\r
- int shift;\r
- int d;\r
- int value;\r
- png_uint_32 i;\r
- png_uint_32 row_width = row_info->width;\r
-\r
- dp = row;\r
- shift = 6;\r
- d = 0;\r
-\r
- for (i = png_pass_start[pass]; i < row_width;\r
- i += png_pass_inc[pass])\r
- {\r
- sp = row + (png_size_t)(i >> 2);\r
- value = (*sp >> ((3 - (int)(i & 0x03)) << 1)) & 0x03;\r
- d |= (value << shift);\r
-\r
- if (shift == 0)\r
- {\r
- shift = 6;\r
- *dp++ = (png_byte)d;\r
- d = 0;\r
- }\r
-\r
- else\r
- shift -= 2;\r
- }\r
- if (shift != 6)\r
- *dp = (png_byte)d;\r
-\r
- break;\r
- }\r
-\r
- case 4:\r
- {\r
- png_bytep sp;\r
- png_bytep dp;\r
- int shift;\r
- int d;\r
- int value;\r
- png_uint_32 i;\r
- png_uint_32 row_width = row_info->width;\r
-\r
- dp = row;\r
- shift = 4;\r
- d = 0;\r
- for (i = png_pass_start[pass]; i < row_width;\r
- i += png_pass_inc[pass])\r
- {\r
- sp = row + (png_size_t)(i >> 1);\r
- value = (*sp >> ((1 - (int)(i & 0x01)) << 2)) & 0x0f;\r
- d |= (value << shift);\r
-\r
- if (shift == 0)\r
- {\r
- shift = 4;\r
- *dp++ = (png_byte)d;\r
- d = 0;\r
- }\r
-\r
- else\r
- shift -= 4;\r
- }\r
- if (shift != 4)\r
- *dp = (png_byte)d;\r
-\r
- break;\r
- }\r
-\r
- default:\r
- {\r
- png_bytep sp;\r
- png_bytep dp;\r
- png_uint_32 i;\r
- png_uint_32 row_width = row_info->width;\r
- png_size_t pixel_bytes;\r
-\r
- /* Start at the beginning */\r
- dp = row;\r
-\r
- /* Find out how many bytes each pixel takes up */\r
- pixel_bytes = (row_info->pixel_depth >> 3);\r
-\r
- /* Loop through the row, only looking at the pixels that matter */\r
- for (i = png_pass_start[pass]; i < row_width;\r
- i += png_pass_inc[pass])\r
- {\r
- /* Find out where the original pixel is */\r
- sp = row + (png_size_t)i * pixel_bytes;\r
-\r
- /* Move the pixel */\r
- if (dp != sp)\r
- png_memcpy(dp, sp, pixel_bytes);\r
-\r
- /* Next pixel */\r
- dp += pixel_bytes;\r
- }\r
- break;\r
- }\r
- }\r
- /* Set new row width */\r
- row_info->width = (row_info->width +\r
- png_pass_inc[pass] - 1 -\r
- png_pass_start[pass]) /\r
- png_pass_inc[pass];\r
-\r
- row_info->rowbytes = PNG_ROWBYTES(row_info->pixel_depth,\r
- row_info->width);\r
- }\r
-}\r
-#endif\r
-\r
-/* This filters the row, chooses which filter to use, if it has not already\r
- * been specified by the application, and then writes the row out with the\r
- * chosen filter.\r
- */\r
-static void png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row,\r
- png_size_t row_bytes);\r
-\r
-#define PNG_MAXSUM (((png_uint_32)(-1)) >> 1)\r
-#define PNG_HISHIFT 10\r
-#define PNG_LOMASK ((png_uint_32)0xffffL)\r
-#define PNG_HIMASK ((png_uint_32)(~PNG_LOMASK >> PNG_HISHIFT))\r
-void /* PRIVATE */\r
-png_write_find_filter(png_structp png_ptr, png_row_infop row_info)\r
-{\r
- png_bytep best_row;\r
-#ifdef PNG_WRITE_FILTER_SUPPORTED\r
- png_bytep prev_row, row_buf;\r
- png_uint_32 mins, bpp;\r
- png_byte filter_to_do = png_ptr->do_filter;\r
- png_size_t row_bytes = row_info->rowbytes;\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- int num_p_filters = png_ptr->num_prev_filters;\r
-#endif\r
-\r
- png_debug(1, "in png_write_find_filter");\r
-\r
-#ifndef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->row_number == 0 && filter_to_do == PNG_ALL_FILTERS)\r
- {\r
- /* These will never be selected so we need not test them. */\r
- filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH);\r
- }\r
-#endif\r
-\r
- /* Find out how many bytes offset each pixel is */\r
- bpp = (row_info->pixel_depth + 7) >> 3;\r
-\r
- prev_row = png_ptr->prev_row;\r
-#endif\r
- best_row = png_ptr->row_buf;\r
-#ifdef PNG_WRITE_FILTER_SUPPORTED\r
- row_buf = best_row;\r
- mins = PNG_MAXSUM;\r
-\r
- /* The prediction method we use is to find which method provides the\r
- * smallest value when summing the absolute values of the distances\r
- * from zero, using anything >= 128 as negative numbers. This is known\r
- * as the "minimum sum of absolute differences" heuristic. Other\r
- * heuristics are the "weighted minimum sum of absolute differences"\r
- * (experimental and can in theory improve compression), and the "zlib\r
- * predictive" method (not implemented yet), which does test compressions\r
- * of lines using different filter methods, and then chooses the\r
- * (series of) filter(s) that give minimum compressed data size (VERY\r
- * computationally expensive).\r
- *\r
- * GRR 980525: consider also\r
- *\r
- * (1) minimum sum of absolute differences from running average (i.e.,\r
- * keep running sum of non-absolute differences & count of bytes)\r
- * [track dispersion, too? restart average if dispersion too large?]\r
- *\r
- * (1b) minimum sum of absolute differences from sliding average, probably\r
- * with window size <= deflate window (usually 32K)\r
- *\r
- * (2) minimum sum of squared differences from zero or running average\r
- * (i.e., ~ root-mean-square approach)\r
- */\r
-\r
-\r
- /* We don't need to test the 'no filter' case if this is the only filter\r
- * that has been chosen, as it doesn't actually do anything to the data.\r
- */\r
- if ((filter_to_do & PNG_FILTER_NONE) && filter_to_do != PNG_FILTER_NONE)\r
- {\r
- png_bytep rp;\r
- png_uint_32 sum = 0;\r
- png_size_t i;\r
- int v;\r
-\r
- for (i = 0, rp = row_buf + 1; i < row_bytes; i++, rp++)\r
- {\r
- v = *rp;\r
- sum += (v < 128) ? v : 256 - v;\r
- }\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- png_uint_32 sumhi, sumlo;\r
- int j;\r
- sumlo = sum & PNG_LOMASK;\r
- sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK; /* Gives us some footroom */\r
-\r
- /* Reduce the sum if we match any of the previous rows */\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)\r
- {\r
- sumlo = (sumlo * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- /* Factor in the cost of this filter (this is here for completeness,\r
- * but it makes no sense to have a "cost" for the NONE filter, as\r
- * it has the minimum possible computational cost - none).\r
- */\r
- sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>\r
- PNG_COST_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_NONE]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (sumhi > PNG_HIMASK)\r
- sum = PNG_MAXSUM;\r
-\r
- else\r
- sum = (sumhi << PNG_HISHIFT) + sumlo;\r
- }\r
-#endif\r
- mins = sum;\r
- }\r
-\r
- /* Sub filter */\r
- if (filter_to_do == PNG_FILTER_SUB)\r
- /* It's the only filter so no testing is needed */\r
- {\r
- png_bytep rp, lp, dp;\r
- png_size_t i;\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;\r
- i++, rp++, dp++)\r
- {\r
- *dp = *rp;\r
- }\r
-\r
- for (lp = row_buf + 1; i < row_bytes;\r
- i++, rp++, lp++, dp++)\r
- {\r
- *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);\r
- }\r
-\r
- best_row = png_ptr->sub_row;\r
- }\r
-\r
- else if (filter_to_do & PNG_FILTER_SUB)\r
- {\r
- png_bytep rp, dp, lp;\r
- png_uint_32 sum = 0, lmins = mins;\r
- png_size_t i;\r
- int v;\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- /* We temporarily increase the "minimum sum" by the factor we\r
- * would reduce the sum of this filter, so that we can do the\r
- * early exit comparison without scaling the sum each time.\r
- */\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 lmhi, lmlo;\r
- lmlo = lmins & PNG_LOMASK;\r
- lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)\r
- {\r
- lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>\r
- PNG_COST_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (lmhi > PNG_HIMASK)\r
- lmins = PNG_MAXSUM;\r
-\r
- else\r
- lmins = (lmhi << PNG_HISHIFT) + lmlo;\r
- }\r
-#endif\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->sub_row + 1; i < bpp;\r
- i++, rp++, dp++)\r
- {\r
- v = *dp = *rp;\r
-\r
- sum += (v < 128) ? v : 256 - v;\r
- }\r
-\r
- for (lp = row_buf + 1; i < row_bytes;\r
- i++, rp++, lp++, dp++)\r
- {\r
- v = *dp = (png_byte)(((int)*rp - (int)*lp) & 0xff);\r
-\r
- sum += (v < 128) ? v : 256 - v;\r
-\r
- if (sum > lmins) /* We are already worse, don't continue. */\r
- break;\r
- }\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 sumhi, sumlo;\r
- sumlo = sum & PNG_LOMASK;\r
- sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_SUB)\r
- {\r
- sumlo = (sumlo * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- sumlo = (sumlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>\r
- PNG_COST_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_SUB]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (sumhi > PNG_HIMASK)\r
- sum = PNG_MAXSUM;\r
-\r
- else\r
- sum = (sumhi << PNG_HISHIFT) + sumlo;\r
- }\r
-#endif\r
-\r
- if (sum < mins)\r
- {\r
- mins = sum;\r
- best_row = png_ptr->sub_row;\r
- }\r
- }\r
-\r
- /* Up filter */\r
- if (filter_to_do == PNG_FILTER_UP)\r
- {\r
- png_bytep rp, dp, pp;\r
- png_size_t i;\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,\r
- pp = prev_row + 1; i < row_bytes;\r
- i++, rp++, pp++, dp++)\r
- {\r
- *dp = (png_byte)(((int)*rp - (int)*pp) & 0xff);\r
- }\r
-\r
- best_row = png_ptr->up_row;\r
- }\r
-\r
- else if (filter_to_do & PNG_FILTER_UP)\r
- {\r
- png_bytep rp, dp, pp;\r
- png_uint_32 sum = 0, lmins = mins;\r
- png_size_t i;\r
- int v;\r
-\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 lmhi, lmlo;\r
- lmlo = lmins & PNG_LOMASK;\r
- lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)\r
- {\r
- lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>\r
- PNG_COST_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_UP]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (lmhi > PNG_HIMASK)\r
- lmins = PNG_MAXSUM;\r
-\r
- else\r
- lmins = (lmhi << PNG_HISHIFT) + lmlo;\r
- }\r
-#endif\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->up_row + 1,\r
- pp = prev_row + 1; i < row_bytes; i++)\r
- {\r
- v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);\r
-\r
- sum += (v < 128) ? v : 256 - v;\r
-\r
- if (sum > lmins) /* We are already worse, don't continue. */\r
- break;\r
- }\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 sumhi, sumlo;\r
- sumlo = sum & PNG_LOMASK;\r
- sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_UP)\r
- {\r
- sumlo = (sumlo * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>\r
- PNG_COST_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_UP]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (sumhi > PNG_HIMASK)\r
- sum = PNG_MAXSUM;\r
-\r
- else\r
- sum = (sumhi << PNG_HISHIFT) + sumlo;\r
- }\r
-#endif\r
-\r
- if (sum < mins)\r
- {\r
- mins = sum;\r
- best_row = png_ptr->up_row;\r
- }\r
- }\r
-\r
- /* Avg filter */\r
- if (filter_to_do == PNG_FILTER_AVG)\r
- {\r
- png_bytep rp, dp, pp, lp;\r
- png_uint_32 i;\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,\r
- pp = prev_row + 1; i < bpp; i++)\r
- {\r
- *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);\r
- }\r
-\r
- for (lp = row_buf + 1; i < row_bytes; i++)\r
- {\r
- *dp++ = (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2))\r
- & 0xff);\r
- }\r
- best_row = png_ptr->avg_row;\r
- }\r
-\r
- else if (filter_to_do & PNG_FILTER_AVG)\r
- {\r
- png_bytep rp, dp, pp, lp;\r
- png_uint_32 sum = 0, lmins = mins;\r
- png_size_t i;\r
- int v;\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 lmhi, lmlo;\r
- lmlo = lmins & PNG_LOMASK;\r
- lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_AVG)\r
- {\r
- lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>\r
- PNG_COST_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_AVG]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (lmhi > PNG_HIMASK)\r
- lmins = PNG_MAXSUM;\r
-\r
- else\r
- lmins = (lmhi << PNG_HISHIFT) + lmlo;\r
- }\r
-#endif\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->avg_row + 1,\r
- pp = prev_row + 1; i < bpp; i++)\r
- {\r
- v = *dp++ = (png_byte)(((int)*rp++ - ((int)*pp++ / 2)) & 0xff);\r
-\r
- sum += (v < 128) ? v : 256 - v;\r
- }\r
-\r
- for (lp = row_buf + 1; i < row_bytes; i++)\r
- {\r
- v = *dp++ =\r
- (png_byte)(((int)*rp++ - (((int)*pp++ + (int)*lp++) / 2)) & 0xff);\r
-\r
- sum += (v < 128) ? v : 256 - v;\r
-\r
- if (sum > lmins) /* We are already worse, don't continue. */\r
- break;\r
- }\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 sumhi, sumlo;\r
- sumlo = sum & PNG_LOMASK;\r
- sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_NONE)\r
- {\r
- sumlo = (sumlo * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>\r
- PNG_COST_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_AVG]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (sumhi > PNG_HIMASK)\r
- sum = PNG_MAXSUM;\r
-\r
- else\r
- sum = (sumhi << PNG_HISHIFT) + sumlo;\r
- }\r
-#endif\r
-\r
- if (sum < mins)\r
- {\r
- mins = sum;\r
- best_row = png_ptr->avg_row;\r
- }\r
- }\r
-\r
- /* Paeth filter */\r
- if (filter_to_do == PNG_FILTER_PAETH)\r
- {\r
- png_bytep rp, dp, pp, cp, lp;\r
- png_size_t i;\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,\r
- pp = prev_row + 1; i < bpp; i++)\r
- {\r
- *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);\r
- }\r
-\r
- for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)\r
- {\r
- int a, b, c, pa, pb, pc, p;\r
-\r
- b = *pp++;\r
- c = *cp++;\r
- a = *lp++;\r
-\r
- p = b - c;\r
- pc = a - c;\r
-\r
-#ifdef PNG_USE_ABS\r
- pa = abs(p);\r
- pb = abs(pc);\r
- pc = abs(p + pc);\r
-#else\r
- pa = p < 0 ? -p : p;\r
- pb = pc < 0 ? -pc : pc;\r
- pc = (p + pc) < 0 ? -(p + pc) : p + pc;\r
-#endif\r
-\r
- p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;\r
-\r
- *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);\r
- }\r
- best_row = png_ptr->paeth_row;\r
- }\r
-\r
- else if (filter_to_do & PNG_FILTER_PAETH)\r
- {\r
- png_bytep rp, dp, pp, cp, lp;\r
- png_uint_32 sum = 0, lmins = mins;\r
- png_size_t i;\r
- int v;\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 lmhi, lmlo;\r
- lmlo = lmins & PNG_LOMASK;\r
- lmhi = (lmins >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)\r
- {\r
- lmlo = (lmlo * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- lmlo = (lmlo * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>\r
- PNG_COST_SHIFT;\r
-\r
- lmhi = (lmhi * png_ptr->inv_filter_costs[PNG_FILTER_VALUE_PAETH]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (lmhi > PNG_HIMASK)\r
- lmins = PNG_MAXSUM;\r
-\r
- else\r
- lmins = (lmhi << PNG_HISHIFT) + lmlo;\r
- }\r
-#endif\r
-\r
- for (i = 0, rp = row_buf + 1, dp = png_ptr->paeth_row + 1,\r
- pp = prev_row + 1; i < bpp; i++)\r
- {\r
- v = *dp++ = (png_byte)(((int)*rp++ - (int)*pp++) & 0xff);\r
-\r
- sum += (v < 128) ? v : 256 - v;\r
- }\r
-\r
- for (lp = row_buf + 1, cp = prev_row + 1; i < row_bytes; i++)\r
- {\r
- int a, b, c, pa, pb, pc, p;\r
-\r
- b = *pp++;\r
- c = *cp++;\r
- a = *lp++;\r
-\r
-#ifndef PNG_SLOW_PAETH\r
- p = b - c;\r
- pc = a - c;\r
-#ifdef PNG_USE_ABS\r
- pa = abs(p);\r
- pb = abs(pc);\r
- pc = abs(p + pc);\r
-#else\r
- pa = p < 0 ? -p : p;\r
- pb = pc < 0 ? -pc : pc;\r
- pc = (p + pc) < 0 ? -(p + pc) : p + pc;\r
-#endif\r
- p = (pa <= pb && pa <=pc) ? a : (pb <= pc) ? b : c;\r
-#else /* PNG_SLOW_PAETH */\r
- p = a + b - c;\r
- pa = abs(p - a);\r
- pb = abs(p - b);\r
- pc = abs(p - c);\r
-\r
- if (pa <= pb && pa <= pc)\r
- p = a;\r
-\r
- else if (pb <= pc)\r
- p = b;\r
-\r
- else\r
- p = c;\r
-#endif /* PNG_SLOW_PAETH */\r
-\r
- v = *dp++ = (png_byte)(((int)*rp++ - p) & 0xff);\r
-\r
- sum += (v < 128) ? v : 256 - v;\r
-\r
- if (sum > lmins) /* We are already worse, don't continue. */\r
- break;\r
- }\r
-\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)\r
- {\r
- int j;\r
- png_uint_32 sumhi, sumlo;\r
- sumlo = sum & PNG_LOMASK;\r
- sumhi = (sum >> PNG_HISHIFT) & PNG_HIMASK;\r
-\r
- for (j = 0; j < num_p_filters; j++)\r
- {\r
- if (png_ptr->prev_filters[j] == PNG_FILTER_VALUE_PAETH)\r
- {\r
- sumlo = (sumlo * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_weights[j]) >>\r
- PNG_WEIGHT_SHIFT;\r
- }\r
- }\r
-\r
- sumlo = (sumlo * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>\r
- PNG_COST_SHIFT;\r
-\r
- sumhi = (sumhi * png_ptr->filter_costs[PNG_FILTER_VALUE_PAETH]) >>\r
- PNG_COST_SHIFT;\r
-\r
- if (sumhi > PNG_HIMASK)\r
- sum = PNG_MAXSUM;\r
-\r
- else\r
- sum = (sumhi << PNG_HISHIFT) + sumlo;\r
- }\r
-#endif\r
-\r
- if (sum < mins)\r
- {\r
- best_row = png_ptr->paeth_row;\r
- }\r
- }\r
-#endif /* PNG_WRITE_FILTER_SUPPORTED */\r
-\r
- /* Do the actual writing of the filtered row data from the chosen filter. */\r
- png_write_filtered_row(png_ptr, best_row, row_info->rowbytes+1);\r
-\r
-#ifdef PNG_WRITE_FILTER_SUPPORTED\r
-#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED\r
- /* Save the type of filter we picked this time for future calculations */\r
- if (png_ptr->num_prev_filters > 0)\r
- {\r
- int j;\r
-\r
- for (j = 1; j < num_p_filters; j++)\r
- {\r
- png_ptr->prev_filters[j] = png_ptr->prev_filters[j - 1];\r
- }\r
-\r
- png_ptr->prev_filters[j] = best_row[0];\r
- }\r
-#endif\r
-#endif /* PNG_WRITE_FILTER_SUPPORTED */\r
-}\r
-\r
-\r
-/* Do the actual writing of a previously filtered row. */\r
-static void\r
-png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row,\r
- png_size_t avail/*includes filter byte*/)\r
-{\r
- png_debug(1, "in png_write_filtered_row");\r
-\r
- png_debug1(2, "filter = %d", filtered_row[0]);\r
- /* Set up the zlib input buffer */\r
-\r
- png_ptr->zstream.next_in = filtered_row;\r
- png_ptr->zstream.avail_in = 0;\r
- /* Repeat until we have compressed all the data */\r
- do\r
- {\r
- int ret; /* Return of zlib */\r
-\r
- /* Record the number of bytes available - zlib supports at least 65535\r
- * bytes at one step, depending on the size of the zlib type 'uInt', the\r
- * maximum size zlib can write at once is ZLIB_IO_MAX (from pngpriv.h).\r
- * Use this because on 16 bit systems 'rowbytes' can be up to 65536 (i.e.\r
- * one more than 16 bits) and, in this case 'rowbytes+1' can overflow a\r
- * uInt. ZLIB_IO_MAX can be safely reduced to cause zlib to be called\r
- * with smaller chunks of data.\r
- */\r
- if (png_ptr->zstream.avail_in == 0)\r
- {\r
- if (avail > ZLIB_IO_MAX)\r
- {\r
- png_ptr->zstream.avail_in = ZLIB_IO_MAX;\r
- avail -= ZLIB_IO_MAX;\r
- }\r
-\r
- else\r
- {\r
- /* So this will fit in the available uInt space: */\r
- png_ptr->zstream.avail_in = (uInt)avail;\r
- avail = 0;\r
- }\r
- }\r
-\r
- /* Compress the data */\r
- ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);\r
-\r
- /* Check for compression errors */\r
- if (ret != Z_OK)\r
- {\r
- if (png_ptr->zstream.msg != NULL)\r
- png_error(png_ptr, png_ptr->zstream.msg);\r
-\r
- else\r
- png_error(png_ptr, "zlib error");\r
- }\r
-\r
- /* See if it is time to write another IDAT */\r
- if (!(png_ptr->zstream.avail_out))\r
- {\r
- /* Write the IDAT and reset the zlib output buffer */\r
- png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);\r
- }\r
- /* Repeat until all data has been compressed */\r
- } while (avail > 0 || png_ptr->zstream.avail_in > 0);\r
-\r
- /* Swap the current and previous rows */\r
- if (png_ptr->prev_row != NULL)\r
- {\r
- png_bytep tptr;\r
-\r
- tptr = png_ptr->prev_row;\r
- png_ptr->prev_row = png_ptr->row_buf;\r
- png_ptr->row_buf = tptr;\r
- }\r
-\r
- /* Finish row - updates counters and flushes zlib if last row */\r
- png_write_finish_row(png_ptr);\r
-\r
-#ifdef PNG_WRITE_FLUSH_SUPPORTED\r
- png_ptr->flush_rows++;\r
-\r
- if (png_ptr->flush_dist > 0 &&\r
- png_ptr->flush_rows >= png_ptr->flush_dist)\r
- {\r
- png_write_flush(png_ptr);\r
- }\r
-#endif\r
-}\r
-#endif /* PNG_WRITE_SUPPORTED */\r
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