/* pngwutil.c - utilities to write a PNG file
*
- * Last changed in libpng 1.2.34 [December 18, 2008]
- * For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Last changed in libpng 1.4.1 [February 25, 2010]
+ * Copyright (c) 1998-2010 Glenn Randers-Pehrson
* (Version 0.96 Copyright (c) 1996, 1997 Andreas Dilger)
* (Version 0.88 Copyright (c) 1995, 1996 Guy Eric Schalnat, Group 42, Inc.)
+ *
+ * This code is released under the libpng license.
+ * For conditions of distribution and use, see the disclaimer
+ * and license in png.h
*/
-#define PNG_INTERNAL
+#define PNG_NO_PEDANTIC_WARNINGS
#include "png.h"
#ifdef PNG_WRITE_SUPPORTED
+#include "pngpriv.h"
/* Place a 32-bit number into a buffer in PNG byte order. We work
* with unsigned numbers for convenience, although one supported
buf[3] = (png_byte)(i & 0xff);
}
+#ifdef PNG_SAVE_INT_32_SUPPORTED
/* The png_save_int_32 function assumes integers are stored in two's
* complement format. If this isn't the case, then this routine needs to
* be modified to write data in two's complement format.
buf[2] = (png_byte)((i >> 8) & 0xff);
buf[3] = (png_byte)(i & 0xff);
}
+#endif
/* Place a 16-bit number into a buffer in PNG byte order.
* The parameter is declared unsigned int, not png_uint_16,
* we should call png_set_sig_bytes() to tell libpng how many of the
* bytes have already been written.
*/
-void /* PRIVATE */
+void PNGAPI
png_write_sig(png_structp png_ptr)
{
png_byte png_signature[8] = {137, 80, 78, 71, 13, 10, 26, 10};
- /* write the rest of the 8 byte signature */
+#ifdef PNG_IO_STATE_SUPPORTED
+ /* Inform the I/O callback that the signature is being written */
+ png_ptr->io_state = PNG_IO_WRITING | PNG_IO_SIGNATURE;
+#endif
+
+ /* Write the rest of the 8 byte signature */
png_write_data(png_ptr, &png_signature[png_ptr->sig_bytes],
(png_size_t)(8 - png_ptr->sig_bytes));
if (png_ptr->sig_bytes < 3)
png_write_chunk(png_structp png_ptr, png_bytep chunk_name,
png_bytep data, png_size_t length)
{
- if (png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
png_write_chunk_start(png_ptr, chunk_name, (png_uint_32)length);
png_write_chunk_data(png_ptr, data, (png_size_t)length);
png_write_chunk_end(png_ptr);
png_debug2(0, "Writing %s chunk, length = %lu", chunk_name,
(unsigned long)length);
- if (png_ptr == NULL) return;
- /* write the length and the chunk name */
+ if (png_ptr == NULL)
+ return;
+
+#ifdef PNG_IO_STATE_SUPPORTED
+ /* Inform the I/O callback that the chunk header is being written.
+ * PNG_IO_CHUNK_HDR requires a single I/O call.
+ */
+ png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_HDR;
+#endif
+
+ /* Write the length and the chunk name */
png_save_uint_32(buf, length);
png_memcpy(buf + 4, chunk_name, 4);
png_write_data(png_ptr, buf, (png_size_t)8);
- /* put the chunk name into png_ptr->chunk_name */
+ /* Put the chunk name into png_ptr->chunk_name */
png_memcpy(png_ptr->chunk_name, chunk_name, 4);
- /* reset the crc and run it over the chunk name */
+ /* Reset the crc and run it over the chunk name */
png_reset_crc(png_ptr);
- png_calculate_crc(png_ptr, chunk_name, (png_size_t)4);
+ png_calculate_crc(png_ptr, chunk_name, 4);
+
+#ifdef PNG_IO_STATE_SUPPORTED
+ /* Inform the I/O callback that chunk data will (possibly) be written.
+ * PNG_IO_CHUNK_DATA does NOT require a specific number of I/O calls.
+ */
+ png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_DATA;
+#endif
}
/* Write the data of a PNG chunk started with png_write_chunk_start().
void PNGAPI
png_write_chunk_data(png_structp png_ptr, png_bytep data, png_size_t length)
{
- /* write the data, and run the CRC over it */
- if (png_ptr == NULL) return;
+ /* Write the data, and run the CRC over it */
+ if (png_ptr == NULL)
+ return;
if (data != NULL && length > 0)
{
png_write_data(png_ptr, data, length);
- /* update the CRC after writing the data,
+ /* Update the CRC after writing the data,
* in case that the user I/O routine alters it.
*/
png_calculate_crc(png_ptr, data, length);
if (png_ptr == NULL) return;
- /* write the crc in a single operation */
+#ifdef PNG_IO_STATE_SUPPORTED
+ /* Inform the I/O callback that the chunk CRC is being written.
+ * PNG_IO_CHUNK_CRC requires a single I/O function call.
+ */
+ png_ptr->io_state = PNG_IO_WRITING | PNG_IO_CHUNK_CRC;
+#endif
+
+ /* Write the crc in a single operation */
png_save_uint_32(buf, png_ptr->crc);
png_write_data(png_ptr, buf, (png_size_t)4);
}
#if defined(PNG_WRITE_TEXT_SUPPORTED) || defined(PNG_WRITE_iCCP_SUPPORTED)
-/*
- * This pair of functions encapsulates the operation of (a) compressing a
+/* This pair of functions encapsulates the operation of (a) compressing a
* text string, and (b) issuing it later as a series of chunk data writes.
* The compression_state structure is shared context for these functions
* set up by the caller in order to make the whole mess thread-safe.
typedef struct
{
- char *input; /* the uncompressed input data */
- int input_len; /* its length */
- int num_output_ptr; /* number of output pointers used */
- int max_output_ptr; /* size of output_ptr */
- png_charpp output_ptr; /* array of pointers to output */
+ char *input; /* The uncompressed input data */
+ int input_len; /* Its length */
+ int num_output_ptr; /* Number of output pointers used */
+ int max_output_ptr; /* Size of output_ptr */
+ png_charpp output_ptr; /* Array of pointers to output */
} compression_state;
-/* compress given text into storage in the png_ptr structure */
+/* Compress given text into storage in the png_ptr structure */
static int /* PRIVATE */
png_text_compress(png_structp png_ptr,
png_charp text, png_size_t text_len, int compression,
comp->input = NULL;
comp->input_len = 0;
- /* we may just want to pass the text right through */
+ /* We may just want to pass the text right through */
if (compression == PNG_TEXT_COMPRESSION_NONE)
{
comp->input = text;
if (compression >= PNG_TEXT_COMPRESSION_LAST)
{
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+#ifdef PNG_STDIO_SUPPORTED
char msg[50];
png_snprintf(msg, 50, "Unknown compression type %d", compression);
png_warning(png_ptr, msg);
* wouldn't cause a failure, just a slowdown due to swapping).
*/
- /* set up the compression buffers */
+ /* Set up the compression buffers */
png_ptr->zstream.avail_in = (uInt)text_len;
png_ptr->zstream.next_in = (Bytef *)text;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_out = (Bytef *)png_ptr->zbuf;
- /* this is the same compression loop as in png_write_row() */
+ /* This is the same compression loop as in png_write_row() */
do
{
- /* compress the data */
+ /* Compress the data */
ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
if (ret != Z_OK)
{
- /* error */
+ /* Error */
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
png_error(png_ptr, "zlib error");
}
- /* check to see if we need more room */
+ /* Check to see if we need more room */
if (!(png_ptr->zstream.avail_out))
{
- /* make sure the output array has room */
+ /* Make sure the output array has room */
if (comp->num_output_ptr >= comp->max_output_ptr)
{
int old_max;
old_ptr = comp->output_ptr;
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)
+ (png_alloc_size_t)
(comp->max_output_ptr * png_sizeof(png_charpp)));
png_memcpy(comp->output_ptr, old_ptr, old_max
* png_sizeof(png_charp));
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)
+ (png_alloc_size_t)
(comp->max_output_ptr * png_sizeof(png_charp)));
}
- /* save the data */
+ /* Save the data */
comp->output_ptr[comp->num_output_ptr] =
(png_charp)png_malloc(png_ptr,
- (png_uint_32)png_ptr->zbuf_size);
+ (png_alloc_size_t)png_ptr->zbuf_size);
png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size);
comp->num_output_ptr++;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
png_ptr->zstream.next_out = png_ptr->zbuf;
}
- /* continue until we don't have any more to compress */
+ /* Continue until we don't have any more to compress */
} while (png_ptr->zstream.avail_in);
- /* finish the compression */
+ /* Finish the compression */
do
{
- /* tell zlib we are finished */
+ /* Tell zlib we are finished */
ret = deflate(&png_ptr->zstream, Z_FINISH);
if (ret == Z_OK)
{
- /* check to see if we need more room */
+ /* Check to see if we need more room */
if (!(png_ptr->zstream.avail_out))
{
- /* check to make sure our output array has room */
+ /* Check to make sure our output array has room */
if (comp->num_output_ptr >= comp->max_output_ptr)
{
int old_max;
old_ptr = comp->output_ptr;
/* This could be optimized to realloc() */
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(comp->max_output_ptr *
+ (png_alloc_size_t)(comp->max_output_ptr *
png_sizeof(png_charp)));
png_memcpy(comp->output_ptr, old_ptr,
old_max * png_sizeof(png_charp));
}
else
comp->output_ptr = (png_charpp)png_malloc(png_ptr,
- (png_uint_32)(comp->max_output_ptr *
+ (png_alloc_size_t)(comp->max_output_ptr *
png_sizeof(png_charp)));
}
- /* save off the data */
+ /* Save the data */
comp->output_ptr[comp->num_output_ptr] =
(png_charp)png_malloc(png_ptr,
- (png_uint_32)png_ptr->zbuf_size);
+ (png_alloc_size_t)png_ptr->zbuf_size);
png_memcpy(comp->output_ptr[comp->num_output_ptr], png_ptr->zbuf,
png_ptr->zbuf_size);
comp->num_output_ptr++;
}
else if (ret != Z_STREAM_END)
{
- /* we got an error */
+ /* We got an error */
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, png_ptr->zstream.msg);
else
}
} while (ret != Z_STREAM_END);
- /* text length is number of buffers plus last buffer */
+ /* Text length is number of buffers plus last buffer */
text_len = png_ptr->zbuf_size * comp->num_output_ptr;
if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
text_len += png_ptr->zbuf_size - (png_size_t)png_ptr->zstream.avail_out;
return((int)text_len);
}
-/* ship the compressed text out via chunk writes */
+/* Ship the compressed text out via chunk writes */
static void /* PRIVATE */
png_write_compressed_data_out(png_structp png_ptr, compression_state *comp)
{
int i;
- /* handle the no-compression case */
+ /* Handle the no-compression case */
if (comp->input)
{
- png_write_chunk_data(png_ptr, (png_bytep)comp->input,
+ png_write_chunk_data(png_ptr, (png_bytep)comp->input,
(png_size_t)comp->input_len);
- return;
+ return;
}
- /* write saved output buffers, if any */
+ /* Write saved output buffers, if any */
for (i = 0; i < comp->num_output_ptr; i++)
{
png_write_chunk_data(png_ptr, (png_bytep)comp->output_ptr[i],
(png_size_t)png_ptr->zbuf_size);
png_free(png_ptr, comp->output_ptr[i]);
- comp->output_ptr[i]=NULL;
}
if (comp->max_output_ptr != 0)
png_free(png_ptr, comp->output_ptr);
- comp->output_ptr=NULL;
- /* write anything left in zbuf */
+ /* Write anything left in zbuf */
if (png_ptr->zstream.avail_out < (png_uint_32)png_ptr->zbuf_size)
png_write_chunk_data(png_ptr, png_ptr->zbuf,
(png_size_t)(png_ptr->zbuf_size - png_ptr->zstream.avail_out));
- /* reset zlib for another zTXt/iTXt or image data */
+ /* Reset zlib for another zTXt/iTXt or image data */
deflateReset(&png_ptr->zstream);
png_ptr->zstream.data_type = Z_BINARY;
}
int bit_depth, int color_type, int compression_type, int filter_type,
int interlace_type)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IHDR;
-#endif
int ret;
- png_byte buf[13]; /* buffer to store the IHDR info */
+ png_byte buf[13]; /* Buffer to store the IHDR info */
png_debug(1, "in png_write_IHDR");
+
/* Check that we have valid input data from the application info */
switch (color_type)
{
case 4:
case 8:
case 16: png_ptr->channels = 1; break;
- default: png_error(png_ptr, "Invalid bit depth for grayscale image");
+ default: png_error(png_ptr,
+ "Invalid bit depth for grayscale image");
}
break;
case PNG_COLOR_TYPE_RGB:
* 5. The color_type is RGB or RGBA
*/
if (
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+#ifdef PNG_MNG_FEATURES_SUPPORTED
!((png_ptr->mng_features_permitted & PNG_FLAG_MNG_FILTER_64) &&
((png_ptr->mode&PNG_HAVE_PNG_SIGNATURE) == 0) &&
(color_type == PNG_COLOR_TYPE_RGB ||
interlace_type=PNG_INTERLACE_NONE;
#endif
- /* save off the relevent information */
+ /* Save the relevent information */
png_ptr->bit_depth = (png_byte)bit_depth;
png_ptr->color_type = (png_byte)color_type;
png_ptr->interlaced = (png_byte)interlace_type;
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+#ifdef PNG_MNG_FEATURES_SUPPORTED
png_ptr->filter_type = (png_byte)filter_type;
#endif
png_ptr->compression_type = (png_byte)compression_type;
png_ptr->pixel_depth = (png_byte)(bit_depth * png_ptr->channels);
png_ptr->rowbytes = PNG_ROWBYTES(png_ptr->pixel_depth, width);
- /* set the usr info, so any transformations can modify it */
+ /* Set the usr info, so any transformations can modify it */
png_ptr->usr_width = png_ptr->width;
png_ptr->usr_bit_depth = png_ptr->bit_depth;
png_ptr->usr_channels = png_ptr->channels;
- /* pack the header information into the buffer */
+ /* Pack the header information into the buffer */
png_save_uint_32(buf, width);
png_save_uint_32(buf + 4, height);
buf[8] = (png_byte)bit_depth;
buf[11] = (png_byte)filter_type;
buf[12] = (png_byte)interlace_type;
- /* write the chunk */
+ /* Write the chunk */
png_write_chunk(png_ptr, (png_bytep)png_IHDR, buf, (png_size_t)13);
- /* initialize zlib with PNG info */
+ /* Initialize zlib with PNG info */
png_ptr->zstream.zalloc = png_zalloc;
png_ptr->zstream.zfree = png_zfree;
png_ptr->zstream.opaque = (voidpf)png_ptr;
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
/* libpng is not interested in zstream.data_type */
- /* set it to a predefined value, to avoid its evaluation inside zlib */
+ /* Set it to a predefined value, to avoid its evaluation inside zlib */
png_ptr->zstream.data_type = Z_BINARY;
png_ptr->mode = PNG_HAVE_IHDR;
}
-/* write the palette. We are careful not to trust png_color to be in the
+/* Write the palette. We are careful not to trust png_color to be in the
* correct order for PNG, so people can redefine it to any convenient
* structure.
*/
void /* PRIVATE */
png_write_PLTE(png_structp png_ptr, png_colorp palette, png_uint_32 num_pal)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_PLTE;
-#endif
png_uint_32 i;
png_colorp pal_ptr;
png_byte buf[3];
png_debug(1, "in png_write_PLTE");
+
if ((
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+#ifdef PNG_MNG_FEATURES_SUPPORTED
!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE) &&
#endif
num_pal == 0) || num_pal > 256)
png_write_chunk_start(png_ptr, (png_bytep)png_PLTE,
(png_uint_32)(num_pal * 3));
-#ifndef PNG_NO_POINTER_INDEXING
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
for (i = 0, pal_ptr = palette; i < num_pal; i++, pal_ptr++)
{
buf[0] = pal_ptr->red;
png_write_chunk_data(png_ptr, buf, (png_size_t)3);
}
#else
- /* This is a little slower but some buggy compilers need to do this instead */
+ /* This is a little slower but some buggy compilers need to do this
+ * instead
+ */
pal_ptr=palette;
for (i = 0; i < num_pal; i++)
{
png_ptr->mode |= PNG_HAVE_PLTE;
}
-/* write an IDAT chunk */
+/* Write an IDAT chunk */
void /* PRIVATE */
png_write_IDAT(png_structp png_ptr, png_bytep data, png_size_t length)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IDAT;
-#endif
+
png_debug(1, "in png_write_IDAT");
/* Optimize the CMF field in the zlib stream. */
unsigned int z_cmf = data[0]; /* zlib compression method and flags */
if ((z_cmf & 0x0f) == 8 && (z_cmf & 0xf0) <= 0x70)
{
- /* Avoid memory underflows and multiplication overflows. */
- /* The conditions below are practically always satisfied;
- however, they still must be checked. */
+ /* Avoid memory underflows and multiplication overflows.
+ *
+ * The conditions below are practically always satisfied;
+ * however, they still must be checked.
+ */
if (length >= 2 &&
png_ptr->height < 16384 && png_ptr->width < 16384)
{
png_ptr->mode |= PNG_HAVE_IDAT;
}
-/* write an IEND chunk */
+/* Write an IEND chunk */
void /* PRIVATE */
png_write_IEND(png_structp png_ptr)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_IEND;
-#endif
+
png_debug(1, "in png_write_IEND");
- png_write_chunk(png_ptr, (png_bytep)png_IEND, png_bytep_NULL,
+
+ png_write_chunk(png_ptr, (png_bytep)png_IEND, NULL,
(png_size_t)0);
png_ptr->mode |= PNG_HAVE_IEND;
}
-#if defined(PNG_WRITE_gAMA_SUPPORTED)
-/* write a gAMA chunk */
+#ifdef PNG_WRITE_gAMA_SUPPORTED
+/* Write a gAMA chunk */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void /* PRIVATE */
png_write_gAMA(png_structp png_ptr, double file_gamma)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_gAMA;
-#endif
png_uint_32 igamma;
png_byte buf[4];
png_debug(1, "in png_write_gAMA");
+
/* file_gamma is saved in 1/100,000ths */
igamma = (png_uint_32)(file_gamma * 100000.0 + 0.5);
png_save_uint_32(buf, igamma);
void /* PRIVATE */
png_write_gAMA_fixed(png_structp png_ptr, png_fixed_point file_gamma)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_gAMA;
-#endif
png_byte buf[4];
png_debug(1, "in png_write_gAMA");
+
/* file_gamma is saved in 1/100,000ths */
png_save_uint_32(buf, (png_uint_32)file_gamma);
png_write_chunk(png_ptr, (png_bytep)png_gAMA, buf, (png_size_t)4);
#endif
#endif
-#if defined(PNG_WRITE_sRGB_SUPPORTED)
-/* write a sRGB chunk */
+#ifdef PNG_WRITE_sRGB_SUPPORTED
+/* Write a sRGB chunk */
void /* PRIVATE */
png_write_sRGB(png_structp png_ptr, int srgb_intent)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sRGB;
-#endif
png_byte buf[1];
png_debug(1, "in png_write_sRGB");
+
if (srgb_intent >= PNG_sRGB_INTENT_LAST)
png_warning(png_ptr,
"Invalid sRGB rendering intent specified");
}
#endif
-#if defined(PNG_WRITE_iCCP_SUPPORTED)
-/* write an iCCP chunk */
+#ifdef PNG_WRITE_iCCP_SUPPORTED
+/* Write an iCCP chunk */
void /* PRIVATE */
png_write_iCCP(png_structp png_ptr, png_charp name, int compression_type,
png_charp profile, int profile_len)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_iCCP;
-#endif
png_size_t name_len;
png_charp new_name;
compression_state comp;
((*( (png_bytep)profile + 2))<< 8) |
((*( (png_bytep)profile + 3)) );
+ if (embedded_profile_len < 0)
+ {
+ png_warning(png_ptr,
+ "Embedded profile length in iCCP chunk is negative");
+ png_free(png_ptr, new_name);
+ return;
+ }
+
if (profile_len < embedded_profile_len)
{
png_warning(png_ptr,
"Embedded profile length too large in iCCP chunk");
+ png_free(png_ptr, new_name);
return;
}
profile_len = png_text_compress(png_ptr, profile,
(png_size_t)profile_len, PNG_COMPRESSION_TYPE_BASE, &comp);
- /* make sure we include the NULL after the name and the compression type */
+ /* Make sure we include the NULL after the name and the compression type */
png_write_chunk_start(png_ptr, (png_bytep)png_iCCP,
(png_uint_32)(name_len + profile_len + 2));
new_name[name_len + 1] = 0x00;
}
#endif
-#if defined(PNG_WRITE_sPLT_SUPPORTED)
-/* write a sPLT chunk */
+#ifdef PNG_WRITE_sPLT_SUPPORTED
+/* Write a sPLT chunk */
void /* PRIVATE */
png_write_sPLT(png_structp png_ptr, png_sPLT_tp spalette)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sPLT;
-#endif
png_size_t name_len;
png_charp new_name;
png_byte entrybuf[10];
- int entry_size = (spalette->depth == 8 ? 6 : 10);
- int palette_size = entry_size * spalette->nentries;
+ png_size_t entry_size = (spalette->depth == 8 ? 6 : 10);
+ png_size_t palette_size = entry_size * spalette->nentries;
png_sPLT_entryp ep;
-#ifdef PNG_NO_POINTER_INDEXING
+#ifndef PNG_POINTER_INDEXING_SUPPORTED
int i;
#endif
png_debug(1, "in png_write_sPLT");
- if ((name_len = png_check_keyword(png_ptr,
- spalette->name, &new_name))==0)
- return;
- /* make sure we include the NULL after the name */
+ if ((name_len = png_check_keyword(png_ptr,spalette->name, &new_name))==0)
+ return;
+
+ /* Make sure we include the NULL after the name */
png_write_chunk_start(png_ptr, (png_bytep)png_sPLT,
(png_uint_32)(name_len + 2 + palette_size));
png_write_chunk_data(png_ptr, (png_bytep)new_name,
(png_size_t)(name_len + 1));
png_write_chunk_data(png_ptr, (png_bytep)&spalette->depth, (png_size_t)1);
- /* loop through each palette entry, writing appropriately */
-#ifndef PNG_NO_POINTER_INDEXING
+ /* Loop through each palette entry, writing appropriately */
+#ifdef PNG_POINTER_INDEXING_SUPPORTED
for (ep = spalette->entries; ep<spalette->entries + spalette->nentries; ep++)
{
if (spalette->depth == 8)
}
#endif
-#if defined(PNG_WRITE_sBIT_SUPPORTED)
-/* write the sBIT chunk */
+#ifdef PNG_WRITE_sBIT_SUPPORTED
+/* Write the sBIT chunk */
void /* PRIVATE */
png_write_sBIT(png_structp png_ptr, png_color_8p sbit, int color_type)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sBIT;
-#endif
png_byte buf[4];
png_size_t size;
png_debug(1, "in png_write_sBIT");
- /* make sure we don't depend upon the order of PNG_COLOR_8 */
+
+ /* Make sure we don't depend upon the order of PNG_COLOR_8 */
if (color_type & PNG_COLOR_MASK_COLOR)
{
png_byte maxbits;
}
#endif
-#if defined(PNG_WRITE_cHRM_SUPPORTED)
-/* write the cHRM chunk */
+#ifdef PNG_WRITE_cHRM_SUPPORTED
+/* Write the cHRM chunk */
#ifdef PNG_FLOATING_POINT_SUPPORTED
void /* PRIVATE */
png_write_cHRM(png_structp png_ptr, double white_x, double white_y,
double red_x, double red_y, double green_x, double green_y,
double blue_x, double blue_y)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_cHRM;
-#endif
png_byte buf[32];
png_fixed_point int_white_x, int_white_y, int_red_x, int_red_y,
int_blue_x = (png_uint_32)(blue_x * 100000.0 + 0.5);
int_blue_y = (png_uint_32)(blue_y * 100000.0 + 0.5);
-#if !defined(PNG_NO_CHECK_cHRM)
+#ifdef PNG_CHECK_cHRM_SUPPORTED
if (png_check_cHRM_fixed(png_ptr, int_white_x, int_white_y,
int_red_x, int_red_y, int_green_x, int_green_y, int_blue_x, int_blue_y))
#endif
{
- /* each value is saved in 1/100,000ths */
-
- png_save_uint_32(buf, int_white_x);
- png_save_uint_32(buf + 4, int_white_y);
+ /* Each value is saved in 1/100,000ths */
- png_save_uint_32(buf + 8, int_red_x);
- png_save_uint_32(buf + 12, int_red_y);
+ png_save_uint_32(buf, int_white_x);
+ png_save_uint_32(buf + 4, int_white_y);
- png_save_uint_32(buf + 16, int_green_x);
- png_save_uint_32(buf + 20, int_green_y);
+ png_save_uint_32(buf + 8, int_red_x);
+ png_save_uint_32(buf + 12, int_red_y);
- png_save_uint_32(buf + 24, int_blue_x);
- png_save_uint_32(buf + 28, int_blue_y);
+ png_save_uint_32(buf + 16, int_green_x);
+ png_save_uint_32(buf + 20, int_green_y);
- png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+ png_save_uint_32(buf + 24, int_blue_x);
+ png_save_uint_32(buf + 28, int_blue_y);
+
+ png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
}
}
#endif
png_fixed_point green_x, png_fixed_point green_y, png_fixed_point blue_x,
png_fixed_point blue_y)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_cHRM;
-#endif
png_byte buf[32];
png_debug(1, "in png_write_cHRM");
- /* each value is saved in 1/100,000ths */
-#if !defined(PNG_NO_CHECK_cHRM)
+
+ /* Each value is saved in 1/100,000ths */
+#ifdef PNG_CHECK_cHRM_SUPPORTED
if (png_check_cHRM_fixed(png_ptr, white_x, white_y, red_x, red_y,
green_x, green_y, blue_x, blue_y))
#endif
{
- png_save_uint_32(buf, (png_uint_32)white_x);
- png_save_uint_32(buf + 4, (png_uint_32)white_y);
+ png_save_uint_32(buf, (png_uint_32)white_x);
+ png_save_uint_32(buf + 4, (png_uint_32)white_y);
- png_save_uint_32(buf + 8, (png_uint_32)red_x);
- png_save_uint_32(buf + 12, (png_uint_32)red_y);
+ png_save_uint_32(buf + 8, (png_uint_32)red_x);
+ png_save_uint_32(buf + 12, (png_uint_32)red_y);
- png_save_uint_32(buf + 16, (png_uint_32)green_x);
- png_save_uint_32(buf + 20, (png_uint_32)green_y);
+ png_save_uint_32(buf + 16, (png_uint_32)green_x);
+ png_save_uint_32(buf + 20, (png_uint_32)green_y);
- png_save_uint_32(buf + 24, (png_uint_32)blue_x);
- png_save_uint_32(buf + 28, (png_uint_32)blue_y);
+ png_save_uint_32(buf + 24, (png_uint_32)blue_x);
+ png_save_uint_32(buf + 28, (png_uint_32)blue_y);
- png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
+ png_write_chunk(png_ptr, (png_bytep)png_cHRM, buf, (png_size_t)32);
}
}
#endif
#endif
-#if defined(PNG_WRITE_tRNS_SUPPORTED)
-/* write the tRNS chunk */
+#ifdef PNG_WRITE_tRNS_SUPPORTED
+/* Write the tRNS chunk */
void /* PRIVATE */
-png_write_tRNS(png_structp png_ptr, png_bytep trans, png_color_16p tran,
+png_write_tRNS(png_structp png_ptr, png_bytep trans_alpha, png_color_16p tran,
int num_trans, int color_type)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_tRNS;
-#endif
png_byte buf[6];
png_debug(1, "in png_write_tRNS");
+
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
if (num_trans <= 0 || num_trans > (int)png_ptr->num_palette)
png_warning(png_ptr, "Invalid number of transparent colors specified");
return;
}
- /* write the chunk out as it is */
- png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans,
+ /* Write the chunk out as it is */
+ png_write_chunk(png_ptr, (png_bytep)png_tRNS, trans_alpha,
(png_size_t)num_trans);
}
else if (color_type == PNG_COLOR_TYPE_GRAY)
{
- /* one 16 bit value */
+ /* One 16 bit value */
if (tran->gray >= (1 << png_ptr->bit_depth))
{
png_warning(png_ptr,
}
else if (color_type == PNG_COLOR_TYPE_RGB)
{
- /* three 16 bit values */
+ /* Three 16 bit values */
png_save_uint_16(buf, tran->red);
png_save_uint_16(buf + 2, tran->green);
png_save_uint_16(buf + 4, tran->blue);
}
#endif
-#if defined(PNG_WRITE_bKGD_SUPPORTED)
-/* write the background chunk */
+#ifdef PNG_WRITE_bKGD_SUPPORTED
+/* Write the background chunk */
void /* PRIVATE */
png_write_bKGD(png_structp png_ptr, png_color_16p back, int color_type)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_bKGD;
-#endif
png_byte buf[6];
png_debug(1, "in png_write_bKGD");
+
if (color_type == PNG_COLOR_TYPE_PALETTE)
{
if (
-#if defined(PNG_MNG_FEATURES_SUPPORTED)
+#ifdef PNG_MNG_FEATURES_SUPPORTED
(png_ptr->num_palette ||
(!(png_ptr->mng_features_permitted & PNG_FLAG_MNG_EMPTY_PLTE))) &&
#endif
}
#endif
-#if defined(PNG_WRITE_hIST_SUPPORTED)
-/* write the histogram */
+#ifdef PNG_WRITE_hIST_SUPPORTED
+/* Write the histogram */
void /* PRIVATE */
png_write_hIST(png_structp png_ptr, png_uint_16p hist, int num_hist)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_hIST;
-#endif
int i;
png_byte buf[3];
png_debug(1, "in png_write_hIST");
+
if (num_hist > (int)png_ptr->num_palette)
{
png_debug2(3, "num_hist = %d, num_palette = %d", num_hist,
int kwarn=0;
png_debug(1, "in png_check_keyword");
+
*new_key = NULL;
if (key == NULL || (key_len = png_strlen(key)) == 0)
if ((png_byte)*kp < 0x20 ||
((png_byte)*kp > 0x7E && (png_byte)*kp < 0xA1))
{
-#if !defined(PNG_NO_STDIO) && !defined(_WIN32_WCE)
+#ifdef PNG_STDIO_SUPPORTED
char msg[40];
png_snprintf(msg, 40,
while (*kp == ' ')
{
- *(kp--) = '\0';
- key_len--;
+ *(kp--) = '\0';
+ key_len--;
}
}
while (*kp == ' ')
{
- kp++;
- key_len--;
+ kp++;
+ key_len--;
}
}
if (key_len == 0)
{
png_free(png_ptr, *new_key);
- *new_key=NULL;
png_warning(png_ptr, "Zero length keyword");
}
}
#endif
-#if defined(PNG_WRITE_tEXt_SUPPORTED)
-/* write a tEXt chunk */
+#ifdef PNG_WRITE_tEXt_SUPPORTED
+/* Write a tEXt chunk */
void /* PRIVATE */
png_write_tEXt(png_structp png_ptr, png_charp key, png_charp text,
png_size_t text_len)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_tEXt;
-#endif
png_size_t key_len;
png_charp new_key;
png_debug(1, "in png_write_tEXt");
+
if ((key_len = png_check_keyword(png_ptr, key, &new_key))==0)
return;
else
text_len = png_strlen(text);
- /* make sure we include the 0 after the key */
+ /* Make sure we include the 0 after the key */
png_write_chunk_start(png_ptr, (png_bytep)png_tEXt,
(png_uint_32)(key_len + text_len + 1));
/*
}
#endif
-#if defined(PNG_WRITE_zTXt_SUPPORTED)
-/* write a compressed text chunk */
+#ifdef PNG_WRITE_zTXt_SUPPORTED
+/* Write a compressed text chunk */
void /* PRIVATE */
png_write_zTXt(png_structp png_ptr, png_charp key, png_charp text,
png_size_t text_len, int compression)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_zTXt;
-#endif
png_size_t key_len;
char buf[1];
png_charp new_key;
text_len = png_strlen(text);
- /* compute the compressed data; do it now for the length */
+ /* Compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression,
&comp);
- /* write start of chunk */
+ /* Write start of chunk */
png_write_chunk_start(png_ptr, (png_bytep)png_zTXt,
(png_uint_32)(key_len+text_len + 2));
- /* write key */
+ /* Write key */
png_write_chunk_data(png_ptr, (png_bytep)new_key,
(png_size_t)(key_len + 1));
png_free(png_ptr, new_key);
buf[0] = (png_byte)compression;
- /* write compression */
+ /* Write compression */
png_write_chunk_data(png_ptr, (png_bytep)buf, (png_size_t)1);
- /* write the compressed data */
+ /* Write the compressed data */
png_write_compressed_data_out(png_ptr, &comp);
- /* close the chunk */
+ /* Close the chunk */
png_write_chunk_end(png_ptr);
}
#endif
-#if defined(PNG_WRITE_iTXt_SUPPORTED)
-/* write an iTXt chunk */
+#ifdef PNG_WRITE_iTXt_SUPPORTED
+/* Write an iTXt chunk */
void /* PRIVATE */
png_write_iTXt(png_structp png_ptr, int compression, png_charp key,
png_charp lang, png_charp lang_key, png_charp text)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_iTXt;
-#endif
png_size_t lang_len, key_len, lang_key_len, text_len;
png_charp new_lang;
png_charp new_key = NULL;
}
if (lang_key == NULL)
- lang_key_len = 0;
+ lang_key_len = 0;
else
- lang_key_len = png_strlen(lang_key);
+ lang_key_len = png_strlen(lang_key);
if (text == NULL)
text_len = 0;
else
- text_len = png_strlen(text);
+ text_len = png_strlen(text);
- /* compute the compressed data; do it now for the length */
+ /* Compute the compressed data; do it now for the length */
text_len = png_text_compress(png_ptr, text, text_len, compression-2,
&comp);
- /* make sure we include the compression flag, the compression byte,
+ /* Make sure we include the compression flag, the compression byte,
* and the NULs after the key, lang, and lang_key parts */
png_write_chunk_start(png_ptr, (png_bytep)png_iTXt,
+ lang_key_len
+ text_len));
- /*
- * We leave it to the application to meet PNG-1.0 requirements on the
+ /* We leave it to the application to meet PNG-1.0 requirements on the
* contents of the text. PNG-1.0 through PNG-1.2 discourage the use of
* any non-Latin-1 characters except for NEWLINE. ISO PNG will forbid them.
* The NUL character is forbidden by PNG-1.0 through PNG-1.2 and ISO PNG.
png_write_chunk_data(png_ptr, (png_bytep)new_key,
(png_size_t)(key_len + 1));
- /* set the compression flag */
+ /* Set the compression flag */
if (compression == PNG_ITXT_COMPRESSION_NONE || \
compression == PNG_TEXT_COMPRESSION_NONE)
cbuf[0] = 0;
else /* compression == PNG_ITXT_COMPRESSION_zTXt */
cbuf[0] = 1;
- /* set the compression method */
+ /* Set the compression method */
cbuf[1] = 0;
png_write_chunk_data(png_ptr, cbuf, (png_size_t)2);
}
#endif
-#if defined(PNG_WRITE_oFFs_SUPPORTED)
-/* write the oFFs chunk */
+#ifdef PNG_WRITE_oFFs_SUPPORTED
+/* Write the oFFs chunk */
void /* PRIVATE */
png_write_oFFs(png_structp png_ptr, png_int_32 x_offset, png_int_32 y_offset,
int unit_type)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_oFFs;
-#endif
png_byte buf[9];
png_debug(1, "in png_write_oFFs");
+
if (unit_type >= PNG_OFFSET_LAST)
png_warning(png_ptr, "Unrecognized unit type for oFFs chunk");
png_write_chunk(png_ptr, (png_bytep)png_oFFs, buf, (png_size_t)9);
}
#endif
-#if defined(PNG_WRITE_pCAL_SUPPORTED)
-/* write the pCAL chunk (described in the PNG extensions document) */
+#ifdef PNG_WRITE_pCAL_SUPPORTED
+/* Write the pCAL chunk (described in the PNG extensions document) */
void /* PRIVATE */
png_write_pCAL(png_structp png_ptr, png_charp purpose, png_int_32 X0,
png_int_32 X1, int type, int nparams, png_charp units, png_charpp params)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_pCAL;
-#endif
png_size_t purpose_len, units_len, total_len;
png_uint_32p params_len;
png_byte buf[10];
int i;
png_debug1(1, "in png_write_pCAL (%d parameters)", nparams);
+
if (type >= PNG_EQUATION_LAST)
png_warning(png_ptr, "Unrecognized equation type for pCAL chunk");
total_len = purpose_len + units_len + 10;
params_len = (png_uint_32p)png_malloc(png_ptr,
- (png_uint_32)(nparams * png_sizeof(png_uint_32)));
+ (png_alloc_size_t)(nparams * png_sizeof(png_uint_32)));
/* Find the length of each parameter, making sure we don't count the
null terminator for the last parameter. */
}
#endif
-#if defined(PNG_WRITE_sCAL_SUPPORTED)
-/* write the sCAL chunk */
-#if defined(PNG_FLOATING_POINT_SUPPORTED) && !defined(PNG_NO_STDIO)
+#ifdef PNG_WRITE_sCAL_SUPPORTED
+/* Write the sCAL chunk */
+#if defined(PNG_FLOATING_POINT_SUPPORTED) && defined(PNG_STDIO_SUPPORTED)
void /* PRIVATE */
png_write_sCAL(png_structp png_ptr, int unit, double width, double height)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
-#endif
char buf[64];
png_size_t total_len;
png_debug(1, "in png_write_sCAL");
buf[0] = (char)unit;
-#if defined(_WIN32_WCE)
-/* sprintf() function is not supported on WindowsCE */
- {
- wchar_t wc_buf[32];
- size_t wc_len;
- swprintf(wc_buf, TEXT("%12.12e"), width);
- wc_len = wcslen(wc_buf);
- WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + 1, wc_len, NULL, NULL);
- total_len = wc_len + 2;
- swprintf(wc_buf, TEXT("%12.12e"), height);
- wc_len = wcslen(wc_buf);
- WideCharToMultiByte(CP_ACP, 0, wc_buf, -1, buf + total_len, wc_len,
- NULL, NULL);
- total_len += wc_len;
- }
-#else
png_snprintf(buf + 1, 63, "%12.12e", width);
total_len = 1 + png_strlen(buf + 1) + 1;
png_snprintf(buf + total_len, 64-total_len, "%12.12e", height);
total_len += png_strlen(buf + total_len);
-#endif
png_debug1(3, "sCAL total length = %u", (unsigned int)total_len);
png_write_chunk(png_ptr, (png_bytep)png_sCAL, (png_bytep)buf, total_len);
png_write_sCAL_s(png_structp png_ptr, int unit, png_charp width,
png_charp height)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_sCAL;
-#endif
png_byte buf[64];
png_size_t wlen, hlen, total_len;
}
buf[0] = (png_byte)unit;
- png_memcpy(buf + 1, width, wlen + 1); /* append the '\0' here */
- png_memcpy(buf + wlen + 2, height, hlen); /* do NOT append the '\0' here */
+ png_memcpy(buf + 1, width, wlen + 1); /* Append the '\0' here */
+ png_memcpy(buf + wlen + 2, height, hlen); /* Do NOT append the '\0' here */
png_debug1(3, "sCAL total length = %u", (unsigned int)total_len);
png_write_chunk(png_ptr, (png_bytep)png_sCAL, buf, total_len);
#endif
#endif
-#if defined(PNG_WRITE_pHYs_SUPPORTED)
-/* write the pHYs chunk */
+#ifdef PNG_WRITE_pHYs_SUPPORTED
+/* Write the pHYs chunk */
void /* PRIVATE */
png_write_pHYs(png_structp png_ptr, png_uint_32 x_pixels_per_unit,
png_uint_32 y_pixels_per_unit,
int unit_type)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_pHYs;
-#endif
png_byte buf[9];
png_debug(1, "in png_write_pHYs");
+
if (unit_type >= PNG_RESOLUTION_LAST)
png_warning(png_ptr, "Unrecognized unit type for pHYs chunk");
}
#endif
-#if defined(PNG_WRITE_tIME_SUPPORTED)
+#ifdef PNG_WRITE_tIME_SUPPORTED
/* Write the tIME chunk. Use either png_convert_from_struct_tm()
* or png_convert_from_time_t(), or fill in the structure yourself.
*/
void /* PRIVATE */
png_write_tIME(png_structp png_ptr, png_timep mod_time)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
PNG_tIME;
-#endif
png_byte buf[7];
png_debug(1, "in png_write_tIME");
+
if (mod_time->month > 12 || mod_time->month < 1 ||
mod_time->day > 31 || mod_time->day < 1 ||
mod_time->hour > 23 || mod_time->second > 60)
}
#endif
-/* initializes the row writing capability of libpng */
+/* Initializes the row writing capability of libpng */
void /* PRIVATE */
png_write_start_row(png_structp png_ptr)
{
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-#ifdef PNG_USE_LOCAL_ARRAYS
- /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
- /* start of interlace block */
+ /* Start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
- /* offset to next interlace block */
+ /* Offset to next interlace block */
int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
- /* start of interlace block in the y direction */
+ /* Start of interlace block in the y direction */
int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
- /* offset to next interlace block in the y direction */
+ /* Offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
-#endif
#endif
png_size_t buf_size;
png_debug(1, "in png_write_start_row");
+
buf_size = (png_size_t)(PNG_ROWBYTES(
png_ptr->usr_channels*png_ptr->usr_bit_depth, png_ptr->width) + 1);
- /* set up row buffer */
+ /* Set up row buffer */
png_ptr->row_buf = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)buf_size);
+ (png_alloc_size_t)buf_size);
png_ptr->row_buf[0] = PNG_FILTER_VALUE_NONE;
-#ifndef PNG_NO_WRITE_FILTER
- /* set up filtering buffer, if using this filter */
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+ /* Set up filtering buffer, if using this filter */
if (png_ptr->do_filter & PNG_FILTER_SUB)
{
png_ptr->sub_row = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(png_ptr->rowbytes + 1));
+ (png_alloc_size_t)(png_ptr->rowbytes + 1));
png_ptr->sub_row[0] = PNG_FILTER_VALUE_SUB;
}
/* We only need to keep the previous row if we are using one of these. */
if (png_ptr->do_filter & (PNG_FILTER_AVG | PNG_FILTER_UP | PNG_FILTER_PAETH))
{
- /* set up previous row buffer */
- png_ptr->prev_row = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)buf_size);
- png_memset(png_ptr->prev_row, 0, buf_size);
+ /* Set up previous row buffer */
+ png_ptr->prev_row = (png_bytep)png_calloc(png_ptr,
+ (png_alloc_size_t)buf_size);
if (png_ptr->do_filter & PNG_FILTER_UP)
{
png_ptr->up_row = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(png_ptr->rowbytes + 1));
+ (png_size_t)(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 = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(png_ptr->rowbytes + 1));
+ (png_alloc_size_t)(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 = (png_bytep)png_malloc(png_ptr,
- (png_uint_32)(png_ptr->rowbytes + 1));
+ (png_size_t)(png_ptr->rowbytes + 1));
png_ptr->paeth_row[0] = PNG_FILTER_VALUE_PAETH;
}
}
-#endif /* PNG_NO_WRITE_FILTER */
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
- /* if interlaced, we need to set up width and height of pass */
+ /* If interlaced, we need to set up width and height of pass */
if (png_ptr->interlaced)
{
if (!(png_ptr->transformations & PNG_INTERLACE))
png_write_finish_row(png_structp png_ptr)
{
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
-#ifdef PNG_USE_LOCAL_ARRAYS
- /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
- /* start of interlace block */
+ /* Start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
- /* offset to next interlace block */
+ /* Offset to next interlace block */
int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
- /* start of interlace block in the y direction */
+ /* Start of interlace block in the y direction */
int png_pass_ystart[7] = {0, 0, 4, 0, 2, 0, 1};
- /* offset to next interlace block in the y direction */
+ /* Offset to next interlace block in the y direction */
int png_pass_yinc[7] = {8, 8, 8, 4, 4, 2, 2};
-#endif
#endif
int ret;
png_debug(1, "in png_write_finish_row");
- /* next row */
+
+ /* Next row */
png_ptr->row_number++;
- /* see if we are done */
+ /* See if we are done */
if (png_ptr->row_number < png_ptr->num_rows)
return;
#ifdef PNG_WRITE_INTERLACING_SUPPORTED
- /* if interlaced, go to next pass */
+ /* If interlaced, go to next pass */
if (png_ptr->interlaced)
{
png_ptr->row_number = 0;
}
else
{
- /* loop until we find a non-zero width or height pass */
+ /* Loop until we find a non-zero width or height pass */
do
{
png_ptr->pass++;
}
- /* reset the row above the image for the next pass */
+ /* Reset the row above the image for the next pass */
if (png_ptr->pass < 7)
{
if (png_ptr->prev_row != NULL)
}
#endif
- /* if we get here, we've just written the last row, so we need
+ /* If we get here, we've just written the last row, so we need
to flush the compressor */
do
{
- /* tell the compressor we are done */
+ /* Tell the compressor we are done */
ret = deflate(&png_ptr->zstream, Z_FINISH);
- /* check for an error */
+ /* Check for an error */
if (ret == Z_OK)
{
- /* check to see if we need more room */
+ /* Check to see if we need more room */
if (!(png_ptr->zstream.avail_out))
{
png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
}
} while (ret != Z_STREAM_END);
- /* write any extra space */
+ /* Write any extra space */
if (png_ptr->zstream.avail_out < png_ptr->zbuf_size)
{
png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size -
png_ptr->zstream.data_type = Z_BINARY;
}
-#if defined(PNG_WRITE_INTERLACING_SUPPORTED)
+#ifdef PNG_WRITE_INTERLACING_SUPPORTED
/* Pick out the correct pixels for the interlace pass.
* The basic idea here is to go through the row with a source
* pointer and a destination pointer (sp and dp), and copy the
void /* PRIVATE */
png_do_write_interlace(png_row_infop row_info, png_bytep row, int pass)
{
-#ifdef PNG_USE_LOCAL_ARRAYS
- /* arrays to facilitate easy interlacing - use pass (0 - 6) as index */
+ /* Arrays to facilitate easy interlacing - use pass (0 - 6) as index */
- /* start of interlace block */
+ /* Start of interlace block */
int png_pass_start[7] = {0, 4, 0, 2, 0, 1, 0};
- /* offset to next interlace block */
+ /* Offset to next interlace block */
int png_pass_inc[7] = {8, 8, 4, 4, 2, 2, 1};
-#endif
png_debug(1, "in png_do_write_interlace");
- /* we don't have to do anything on the last pass (6) */
-#if defined(PNG_USELESS_TESTS_SUPPORTED)
- if (row != NULL && row_info != NULL && pass < 6)
-#else
+
+ /* We don't have to do anything on the last pass (6) */
if (pass < 6)
-#endif
{
- /* each pixel depth is handled separately */
+ /* Each pixel depth is handled separately */
switch (row_info->pixel_depth)
{
case 1:
png_uint_32 row_width = row_info->width;
png_size_t pixel_bytes;
- /* start at the beginning */
+ /* Start at the beginning */
dp = row;
- /* find out how many bytes each pixel takes up */
+ /* Find out how many bytes each pixel takes up */
pixel_bytes = (row_info->pixel_depth >> 3);
- /* loop through the row, only looking at the pixels that
+ /* Loop through the row, only looking at the pixels that
matter */
for (i = png_pass_start[pass]; i < row_width;
i += png_pass_inc[pass])
{
- /* find out where the original pixel is */
+ /* Find out where the original pixel is */
sp = row + (png_size_t)i * pixel_bytes;
- /* move the pixel */
+ /* Move the pixel */
if (dp != sp)
png_memcpy(dp, sp, pixel_bytes);
- /* next pixel */
+ /* Next pixel */
dp += pixel_bytes;
}
break;
}
}
- /* set new row width */
+ /* Set new row width */
row_info->width = (row_info->width +
png_pass_inc[pass] - 1 -
png_pass_start[pass]) /
png_write_find_filter(png_structp png_ptr, png_row_infop row_info)
{
png_bytep best_row;
-#ifndef PNG_NO_WRITE_FILTER
+#ifdef PNG_WRITE_FILTER_SUPPORTED
png_bytep prev_row, row_buf;
png_uint_32 mins, bpp;
png_byte filter_to_do = png_ptr->do_filter;
png_uint_32 row_bytes = row_info->rowbytes;
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
int num_p_filters = (int)png_ptr->num_prev_filters;
#endif
png_debug(1, "in png_write_find_filter");
- /* find out how many bytes offset each pixel is */
+
+#ifndef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
+ if (png_ptr->row_number == 0 && filter_to_do == PNG_ALL_FILTERS)
+ {
+ /* These will never be selected so we need not test them. */
+ filter_to_do &= ~(PNG_FILTER_UP | PNG_FILTER_PAETH);
+ }
+#endif
+
+ /* Find out how many bytes offset each pixel is */
bpp = (row_info->pixel_depth + 7) >> 3;
prev_row = png_ptr->prev_row;
#endif
best_row = png_ptr->row_buf;
-#ifndef PNG_NO_WRITE_FILTER
+#ifdef PNG_WRITE_FILTER_SUPPORTED
row_buf = best_row;
mins = PNG_MAXSUM;
sum += (v < 128) ? v : 256 - v;
}
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
png_uint_32 sumhi, sumlo;
mins = sum;
}
- /* sub filter */
+ /* Sub filter */
if (filter_to_do == PNG_FILTER_SUB)
- /* it's the only filter so no testing is needed */
+ /* It's the only filter so no testing is needed */
{
png_bytep rp, lp, dp;
png_uint_32 i;
png_uint_32 i;
int v;
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
/* We temporarily increase the "minimum sum" by the factor we
* would reduce the sum of this filter, so that we can do the
* early exit comparison without scaling the sum each time.
break;
}
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
}
}
- /* up filter */
+ /* Up filter */
if (filter_to_do == PNG_FILTER_UP)
{
png_bytep rp, dp, pp;
int v;
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
break;
}
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
}
}
- /* avg filter */
+ /* Avg filter */
if (filter_to_do == PNG_FILTER_AVG)
{
png_bytep rp, dp, pp, lp;
png_uint_32 i;
int v;
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
break;
}
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
png_uint_32 i;
int v;
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
break;
}
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
if (png_ptr->heuristic_method == PNG_FILTER_HEURISTIC_WEIGHTED)
{
int j;
best_row = png_ptr->paeth_row;
}
}
-#endif /* PNG_NO_WRITE_FILTER */
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
/* Do the actual writing of the filtered row data from the chosen filter. */
png_write_filtered_row(png_ptr, best_row);
-#ifndef PNG_NO_WRITE_FILTER
-#if defined(PNG_WRITE_WEIGHTED_FILTER_SUPPORTED)
+#ifdef PNG_WRITE_FILTER_SUPPORTED
+#ifdef PNG_WRITE_WEIGHTED_FILTER_SUPPORTED
/* Save the type of filter we picked this time for future calculations */
if (png_ptr->num_prev_filters > 0)
{
png_ptr->prev_filters[j] = best_row[0];
}
#endif
-#endif /* PNG_NO_WRITE_FILTER */
+#endif /* PNG_WRITE_FILTER_SUPPORTED */
}
png_write_filtered_row(png_structp png_ptr, png_bytep filtered_row)
{
png_debug(1, "in png_write_filtered_row");
+
png_debug1(2, "filter = %d", filtered_row[0]);
- /* set up the zlib input buffer */
+ /* Set up the zlib input buffer */
png_ptr->zstream.next_in = filtered_row;
png_ptr->zstream.avail_in = (uInt)png_ptr->row_info.rowbytes + 1;
- /* repeat until we have compressed all the data */
+ /* Repeat until we have compressed all the data */
do
{
- int ret; /* return of zlib */
+ int ret; /* Return of zlib */
- /* compress the data */
+ /* Compress the data */
ret = deflate(&png_ptr->zstream, Z_NO_FLUSH);
- /* check for compression errors */
+ /* Check for compression errors */
if (ret != Z_OK)
{
if (png_ptr->zstream.msg != NULL)
png_error(png_ptr, "zlib error");
}
- /* see if it is time to write another IDAT */
+ /* See if it is time to write another IDAT */
if (!(png_ptr->zstream.avail_out))
{
- /* write the IDAT and reset the zlib output buffer */
+ /* Write the IDAT and reset the zlib output buffer */
png_write_IDAT(png_ptr, png_ptr->zbuf, png_ptr->zbuf_size);
png_ptr->zstream.next_out = png_ptr->zbuf;
png_ptr->zstream.avail_out = (uInt)png_ptr->zbuf_size;
}
- /* repeat until all data has been compressed */
+ /* Repeat until all data has been compressed */
} while (png_ptr->zstream.avail_in);
- /* swap the current and previous rows */
+ /* Swap the current and previous rows */
if (png_ptr->prev_row != NULL)
{
png_bytep tptr;
png_ptr->row_buf = tptr;
}
- /* finish row - updates counters and flushes zlib if last row */
+ /* Finish row - updates counters and flushes zlib if last row */
png_write_finish_row(png_ptr);
-#if defined(PNG_WRITE_FLUSH_SUPPORTED)
+#ifdef PNG_WRITE_FLUSH_SUPPORTED
png_ptr->flush_rows++;
if (png_ptr->flush_dist > 0 &&
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