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Unified Diff: third_party/libpng/png.c

Issue 140074: Updates the PNG library to 1.2.37, enables some functionality for O3D (Closed) Base URL: svn://chrome-svn/chrome/trunk/src/
Patch Set: Created 11 years, 6 months ago
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Index: third_party/libpng/png.c
===================================================================
--- third_party/libpng/png.c (revision 18910)
+++ third_party/libpng/png.c (working copy)
@@ -1,9 +1,9 @@
/* png.c - location for general purpose libpng functions
*
- * Last changed in libpng 1.2.34 [December 18, 2008]
+ * Last changed in libpng 1.2.37 [June 4, 2009]
* For conditions of distribution and use, see copyright notice in png.h
- * Copyright (c) 1998-2008 Glenn Randers-Pehrson
+ * Copyright (c) 1998-2009 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.)
*/
@@ -13,7 +13,7 @@
#include "png.h"
/* Generate a compiler error if there is an old png.h in the search path. */
-typedef version_1_2_36 Your_png_h_is_not_version_1_2_36;
+typedef version_1_2_37 Your_png_h_is_not_version_1_2_37;
/* Version information for C files. This had better match the version
* string defined in png.h. */
@@ -53,18 +53,18 @@
PNG_zTXt;
#ifdef PNG_READ_SUPPORTED
-/* 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 */
PNG_CONST int FARDATA png_pass_start[] = {0, 4, 0, 2, 0, 1, 0};
-/* offset to next interlace block */
+/* Offset to next interlace block */
PNG_CONST int FARDATA png_pass_inc[] = {8, 8, 4, 4, 2, 2, 1};
-/* start of interlace block in the y direction */
+/* Start of interlace block in the y direction */
PNG_CONST int FARDATA png_pass_ystart[] = {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 */
PNG_CONST int FARDATA png_pass_yinc[] = {8, 8, 8, 4, 4, 2, 2};
/* Height of interlace block. This is not currently used - if you need
@@ -92,7 +92,8 @@
void PNGAPI
png_set_sig_bytes(png_structp png_ptr, int num_bytes)
{
- if (png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
png_debug(1, "in png_set_sig_bytes");
if (num_bytes > 8)
png_error(png_ptr, "Too many bytes for PNG signature.");
@@ -153,7 +154,8 @@
png_uint_32 save_flags=p->flags;
png_uint_32 num_bytes;
- if (png_ptr == NULL) return (NULL);
+ if (png_ptr == NULL)
+ return (NULL);
if (items > PNG_UINT_32_MAX/size)
{
png_warning (p, "Potential overflow in png_zalloc()");
@@ -183,7 +185,7 @@
return ((voidpf)ptr);
}
-/* function to free memory for zlib */
+/* Function to free memory for zlib */
#ifdef PNG_1_0_X
void PNGAPI
#else
@@ -241,7 +243,8 @@
png_infop info_ptr;
png_debug(1, "in png_create_info_struct");
- if (png_ptr == NULL) return (NULL);
+ if (png_ptr == NULL)
+ return (NULL);
#ifdef PNG_USER_MEM_SUPPORTED
info_ptr = (png_infop)png_create_struct_2(PNG_STRUCT_INFO,
png_ptr->malloc_fn, png_ptr->mem_ptr);
@@ -263,7 +266,8 @@
png_destroy_info_struct(png_structp png_ptr, png_infopp info_ptr_ptr)
{
png_infop info_ptr = NULL;
- if (png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
png_debug(1, "in png_destroy_info_struct");
if (info_ptr_ptr != NULL)
@@ -302,18 +306,19 @@
{
png_infop info_ptr = *ptr_ptr;
- if (info_ptr == NULL) return;
+ if (info_ptr == NULL)
+ return;
png_debug(1, "in png_info_init_3");
if (png_sizeof(png_info) > png_info_struct_size)
- {
- png_destroy_struct(info_ptr);
- info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
- *ptr_ptr = info_ptr;
- }
+ {
+ png_destroy_struct(info_ptr);
+ info_ptr = (png_infop)png_create_struct(PNG_STRUCT_INFO);
+ *ptr_ptr = info_ptr;
+ }
- /* set everything to 0 */
+ /* Set everything to 0 */
png_memset(info_ptr, 0, png_sizeof(png_info));
}
@@ -344,245 +349,245 @@
return;
#if defined(PNG_TEXT_SUPPORTED)
-/* free text item num or (if num == -1) all text items */
+ /* Free text item num or (if num == -1) all text items */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
+ if ((mask & PNG_FREE_TEXT) & info_ptr->free_me)
#else
-if (mask & PNG_FREE_TEXT)
+ if (mask & PNG_FREE_TEXT)
#endif
-{
- if (num != -1)
{
- if (info_ptr->text && info_ptr->text[num].key)
- {
- png_free(png_ptr, info_ptr->text[num].key);
- info_ptr->text[num].key = NULL;
- }
+ if (num != -1)
+ {
+ if (info_ptr->text && info_ptr->text[num].key)
+ {
+ png_free(png_ptr, info_ptr->text[num].key);
+ info_ptr->text[num].key = NULL;
+ }
+ }
+ else
+ {
+ int i;
+ for (i = 0; i < info_ptr->num_text; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
+ png_free(png_ptr, info_ptr->text);
+ info_ptr->text = NULL;
+ info_ptr->num_text=0;
+ }
}
- else
- {
- int i;
- for (i = 0; i < info_ptr->num_text; i++)
- png_free_data(png_ptr, info_ptr, PNG_FREE_TEXT, i);
- png_free(png_ptr, info_ptr->text);
- info_ptr->text = NULL;
- info_ptr->num_text=0;
- }
-}
#endif
#if defined(PNG_tRNS_SUPPORTED)
-/* free any tRNS entry */
+ /* Free any tRNS entry */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
+ if ((mask & PNG_FREE_TRNS) & info_ptr->free_me)
#else
-if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
+ if ((mask & PNG_FREE_TRNS) && (png_ptr->flags & PNG_FLAG_FREE_TRNS))
#endif
-{
- png_free(png_ptr, info_ptr->trans);
- info_ptr->trans = NULL;
- info_ptr->valid &= ~PNG_INFO_tRNS;
+ {
+ png_free(png_ptr, info_ptr->trans);
+ info_ptr->trans = NULL;
+ info_ptr->valid &= ~PNG_INFO_tRNS;
#ifndef PNG_FREE_ME_SUPPORTED
- png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
+ png_ptr->flags &= ~PNG_FLAG_FREE_TRNS;
#endif
-}
+ }
#endif
#if defined(PNG_sCAL_SUPPORTED)
-/* free any sCAL entry */
+ /* Free any sCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
+ if ((mask & PNG_FREE_SCAL) & info_ptr->free_me)
#else
-if (mask & PNG_FREE_SCAL)
+ if (mask & PNG_FREE_SCAL)
#endif
-{
+ {
#if defined(PNG_FIXED_POINT_SUPPORTED) && !defined(PNG_FLOATING_POINT_SUPPORTED)
- png_free(png_ptr, info_ptr->scal_s_width);
- png_free(png_ptr, info_ptr->scal_s_height);
- info_ptr->scal_s_width = NULL;
- info_ptr->scal_s_height = NULL;
+ png_free(png_ptr, info_ptr->scal_s_width);
+ png_free(png_ptr, info_ptr->scal_s_height);
+ info_ptr->scal_s_width = NULL;
+ info_ptr->scal_s_height = NULL;
#endif
- info_ptr->valid &= ~PNG_INFO_sCAL;
-}
+ info_ptr->valid &= ~PNG_INFO_sCAL;
+ }
#endif
#if defined(PNG_pCAL_SUPPORTED)
-/* free any pCAL entry */
+ /* Free any pCAL entry */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
+ if ((mask & PNG_FREE_PCAL) & info_ptr->free_me)
#else
-if (mask & PNG_FREE_PCAL)
+ if (mask & PNG_FREE_PCAL)
#endif
-{
- png_free(png_ptr, info_ptr->pcal_purpose);
- png_free(png_ptr, info_ptr->pcal_units);
- info_ptr->pcal_purpose = NULL;
- info_ptr->pcal_units = NULL;
- if (info_ptr->pcal_params != NULL)
- {
- int i;
- for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
- {
- png_free(png_ptr, info_ptr->pcal_params[i]);
- info_ptr->pcal_params[i]=NULL;
- }
- png_free(png_ptr, info_ptr->pcal_params);
- info_ptr->pcal_params = NULL;
- }
- info_ptr->valid &= ~PNG_INFO_pCAL;
-}
+ {
+ png_free(png_ptr, info_ptr->pcal_purpose);
+ png_free(png_ptr, info_ptr->pcal_units);
+ info_ptr->pcal_purpose = NULL;
+ info_ptr->pcal_units = NULL;
+ if (info_ptr->pcal_params != NULL)
+ {
+ int i;
+ for (i = 0; i < (int)info_ptr->pcal_nparams; i++)
+ {
+ png_free(png_ptr, info_ptr->pcal_params[i]);
+ info_ptr->pcal_params[i]=NULL;
+ }
+ png_free(png_ptr, info_ptr->pcal_params);
+ info_ptr->pcal_params = NULL;
+ }
+ info_ptr->valid &= ~PNG_INFO_pCAL;
+ }
#endif
#if defined(PNG_iCCP_SUPPORTED)
-/* free any iCCP entry */
+ /* Free any iCCP entry */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
+ if ((mask & PNG_FREE_ICCP) & info_ptr->free_me)
#else
-if (mask & PNG_FREE_ICCP)
+ if (mask & PNG_FREE_ICCP)
#endif
-{
- png_free(png_ptr, info_ptr->iccp_name);
- png_free(png_ptr, info_ptr->iccp_profile);
- info_ptr->iccp_name = NULL;
- info_ptr->iccp_profile = NULL;
- info_ptr->valid &= ~PNG_INFO_iCCP;
-}
+ {
+ png_free(png_ptr, info_ptr->iccp_name);
+ png_free(png_ptr, info_ptr->iccp_profile);
+ info_ptr->iccp_name = NULL;
+ info_ptr->iccp_profile = NULL;
+ info_ptr->valid &= ~PNG_INFO_iCCP;
+ }
#endif
#if defined(PNG_sPLT_SUPPORTED)
-/* free a given sPLT entry, or (if num == -1) all sPLT entries */
+ /* Free a given sPLT entry, or (if num == -1) all sPLT entries */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
+ if ((mask & PNG_FREE_SPLT) & info_ptr->free_me)
#else
-if (mask & PNG_FREE_SPLT)
+ if (mask & PNG_FREE_SPLT)
#endif
-{
- if (num != -1)
{
- if (info_ptr->splt_palettes)
+ if (num != -1)
{
- png_free(png_ptr, info_ptr->splt_palettes[num].name);
- png_free(png_ptr, info_ptr->splt_palettes[num].entries);
- info_ptr->splt_palettes[num].name = NULL;
- info_ptr->splt_palettes[num].entries = NULL;
+ if (info_ptr->splt_palettes)
+ {
+ png_free(png_ptr, info_ptr->splt_palettes[num].name);
+ png_free(png_ptr, info_ptr->splt_palettes[num].entries);
+ info_ptr->splt_palettes[num].name = NULL;
+ info_ptr->splt_palettes[num].entries = NULL;
+ }
}
- }
- else
- {
- if (info_ptr->splt_palettes_num)
- {
- int i;
- for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
- png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
+ else
+ {
+ if (info_ptr->splt_palettes_num)
+ {
+ int i;
+ for (i = 0; i < (int)info_ptr->splt_palettes_num; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_SPLT, i);
- png_free(png_ptr, info_ptr->splt_palettes);
- info_ptr->splt_palettes = NULL;
- info_ptr->splt_palettes_num = 0;
- }
- info_ptr->valid &= ~PNG_INFO_sPLT;
+ png_free(png_ptr, info_ptr->splt_palettes);
+ info_ptr->splt_palettes = NULL;
+ info_ptr->splt_palettes_num = 0;
+ }
+ info_ptr->valid &= ~PNG_INFO_sPLT;
+ }
}
-}
#endif
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
- if (png_ptr->unknown_chunk.data)
- {
- png_free(png_ptr, png_ptr->unknown_chunk.data);
- png_ptr->unknown_chunk.data = NULL;
- }
+ if (png_ptr->unknown_chunk.data)
+ {
+ png_free(png_ptr, png_ptr->unknown_chunk.data);
+ png_ptr->unknown_chunk.data = NULL;
+ }
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
+ if ((mask & PNG_FREE_UNKN) & info_ptr->free_me)
#else
-if (mask & PNG_FREE_UNKN)
+ if (mask & PNG_FREE_UNKN)
#endif
-{
- if (num != -1)
{
- if (info_ptr->unknown_chunks)
- {
- png_free(png_ptr, info_ptr->unknown_chunks[num].data);
- info_ptr->unknown_chunks[num].data = NULL;
- }
- }
- else
- {
- int i;
+ if (num != -1)
+ {
+ if (info_ptr->unknown_chunks)
+ {
+ png_free(png_ptr, info_ptr->unknown_chunks[num].data);
+ info_ptr->unknown_chunks[num].data = NULL;
+ }
+ }
+ else
+ {
+ int i;
- if (info_ptr->unknown_chunks_num)
- {
- for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
- png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
+ if (info_ptr->unknown_chunks_num)
+ {
+ for (i = 0; i < (int)info_ptr->unknown_chunks_num; i++)
+ png_free_data(png_ptr, info_ptr, PNG_FREE_UNKN, i);
- png_free(png_ptr, info_ptr->unknown_chunks);
- info_ptr->unknown_chunks = NULL;
- info_ptr->unknown_chunks_num = 0;
- }
+ png_free(png_ptr, info_ptr->unknown_chunks);
+ info_ptr->unknown_chunks = NULL;
+ info_ptr->unknown_chunks_num = 0;
+ }
+ }
}
-}
#endif
#if defined(PNG_hIST_SUPPORTED)
-/* free any hIST entry */
+ /* Free any hIST entry */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
+ if ((mask & PNG_FREE_HIST) & info_ptr->free_me)
#else
-if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
+ if ((mask & PNG_FREE_HIST) && (png_ptr->flags & PNG_FLAG_FREE_HIST))
#endif
-{
- png_free(png_ptr, info_ptr->hist);
- info_ptr->hist = NULL;
- info_ptr->valid &= ~PNG_INFO_hIST;
+ {
+ png_free(png_ptr, info_ptr->hist);
+ info_ptr->hist = NULL;
+ info_ptr->valid &= ~PNG_INFO_hIST;
#ifndef PNG_FREE_ME_SUPPORTED
- png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
+ png_ptr->flags &= ~PNG_FLAG_FREE_HIST;
#endif
-}
+ }
#endif
-/* free any PLTE entry that was internally allocated */
+ /* Free any PLTE entry that was internally allocated */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
+ if ((mask & PNG_FREE_PLTE) & info_ptr->free_me)
#else
-if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
+ if ((mask & PNG_FREE_PLTE) && (png_ptr->flags & PNG_FLAG_FREE_PLTE))
#endif
-{
- png_zfree(png_ptr, info_ptr->palette);
- info_ptr->palette = NULL;
- info_ptr->valid &= ~PNG_INFO_PLTE;
+ {
+ png_zfree(png_ptr, info_ptr->palette);
+ info_ptr->palette = NULL;
+ info_ptr->valid &= ~PNG_INFO_PLTE;
#ifndef PNG_FREE_ME_SUPPORTED
- png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
+ png_ptr->flags &= ~PNG_FLAG_FREE_PLTE;
#endif
- info_ptr->num_palette = 0;
-}
+ info_ptr->num_palette = 0;
+ }
#if defined(PNG_INFO_IMAGE_SUPPORTED)
-/* free any image bits attached to the info structure */
+ /* Free any image bits attached to the info structure */
#ifdef PNG_FREE_ME_SUPPORTED
-if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
+ if ((mask & PNG_FREE_ROWS) & info_ptr->free_me)
#else
-if (mask & PNG_FREE_ROWS)
+ if (mask & PNG_FREE_ROWS)
#endif
-{
- if (info_ptr->row_pointers)
- {
- int row;
- for (row = 0; row < (int)info_ptr->height; row++)
- {
- png_free(png_ptr, info_ptr->row_pointers[row]);
- info_ptr->row_pointers[row]=NULL;
- }
- png_free(png_ptr, info_ptr->row_pointers);
- info_ptr->row_pointers=NULL;
- }
- info_ptr->valid &= ~PNG_INFO_IDAT;
-}
+ {
+ if (info_ptr->row_pointers)
+ {
+ int row;
+ for (row = 0; row < (int)info_ptr->height; row++)
+ {
+ png_free(png_ptr, info_ptr->row_pointers[row]);
+ info_ptr->row_pointers[row]=NULL;
+ }
+ png_free(png_ptr, info_ptr->row_pointers);
+ info_ptr->row_pointers=NULL;
+ }
+ info_ptr->valid &= ~PNG_INFO_IDAT;
+ }
#endif
#ifdef PNG_FREE_ME_SUPPORTED
if (num == -1)
- info_ptr->free_me &= ~mask;
+ info_ptr->free_me &= ~mask;
else
- info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
+ info_ptr->free_me &= ~(mask & ~PNG_FREE_MUL);
#endif
}
@@ -600,9 +605,9 @@
#if defined(PNG_UNKNOWN_CHUNKS_SUPPORTED)
if (png_ptr->num_chunk_list)
{
- png_free(png_ptr, png_ptr->chunk_list);
- png_ptr->chunk_list=NULL;
- png_ptr->num_chunk_list = 0;
+ png_free(png_ptr, png_ptr->chunk_list);
+ png_ptr->chunk_list=NULL;
+ png_ptr->num_chunk_list = 0;
}
#endif
@@ -617,7 +622,8 @@
png_voidp PNGAPI
png_get_io_ptr(png_structp png_ptr)
{
- if (png_ptr == NULL) return (NULL);
+ if (png_ptr == NULL)
+ return (NULL);
return (png_ptr->io_ptr);
}
@@ -633,7 +639,8 @@
png_init_io(png_structp png_ptr, png_FILE_p fp)
{
png_debug(1, "in png_init_io");
- if (png_ptr == NULL) return;
+ if (png_ptr == NULL)
+ return;
png_ptr->io_ptr = (png_voidp)fp;
}
#endif
@@ -649,7 +656,8 @@
{"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"};
- if (png_ptr == NULL) return (NULL);
+ if (png_ptr == NULL)
+ return (NULL);
if (png_ptr->time_buffer == NULL)
{
png_ptr->time_buffer = (png_charp)png_malloc(png_ptr, (png_uint_32)(29*
@@ -693,9 +701,9 @@
png_charp PNGAPI
png_get_copyright(png_structp png_ptr)
{
- png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
- return ((png_charp) "\n libpng version 1.2.36 - May 7, 2009\n\
- Copyright (c) 1998-2008 Glenn Randers-Pehrson\n\
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
+ return ((png_charp) "\n libpng version 1.2.37 - June 4, 2009\n\
+ Copyright (c) 1998-2009 Glenn Randers-Pehrson\n\
Copyright (c) 1996-1997 Andreas Dilger\n\
Copyright (c) 1995-1996 Guy Eric Schalnat, Group 42, Inc.\n");
}
@@ -712,7 +720,7 @@
png_get_libpng_ver(png_structp png_ptr)
{
/* Version of *.c files used when building libpng */
- png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
return ((png_charp) PNG_LIBPNG_VER_STRING);
}
@@ -720,7 +728,7 @@
png_get_header_ver(png_structp png_ptr)
{
/* Version of *.h files used when building libpng */
- png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
return ((png_charp) PNG_LIBPNG_VER_STRING);
}
@@ -728,7 +736,7 @@
png_get_header_version(png_structp png_ptr)
{
/* Returns longer string containing both version and date */
- png_ptr = png_ptr; /* silence compiler warning about unused png_ptr */
+ png_ptr = png_ptr; /* Silence compiler warning about unused png_ptr */
return ((png_charp) PNG_HEADER_VERSION_STRING
#ifndef PNG_READ_SUPPORTED
" (NO READ SUPPORT)"
@@ -741,7 +749,7 @@
int PNGAPI
png_handle_as_unknown(png_structp png_ptr, png_bytep chunk_name)
{
- /* check chunk_name and return "keep" value if it's on the list, else 0 */
+ /* Check chunk_name and return "keep" value if it's on the list, else 0 */
int i;
png_bytep p;
if (png_ptr == NULL || chunk_name == NULL || png_ptr->num_chunk_list<=0)
@@ -758,7 +766,8 @@
int PNGAPI
png_reset_zstream(png_structp png_ptr)
{
- if (png_ptr == NULL) return Z_STREAM_ERROR;
+ if (png_ptr == NULL)
+ return Z_STREAM_ERROR;
return (inflateReset(&png_ptr->zstream));
}
#endif /* defined(PNG_READ_SUPPORTED) || defined(PNG_WRITE_SUPPORTED) */
@@ -774,11 +783,11 @@
#if defined(PNG_READ_SUPPORTED) && defined(PNG_ASSEMBLER_CODE_SUPPORTED)
#if !defined(PNG_1_0_X)
-/* this function was added to libpng 1.2.0 */
+/* This function was added to libpng 1.2.0 */
int PNGAPI
png_mmx_support(void)
{
- /* obsolete, to be removed from libpng-1.4.0 */
+ /* Obsolete, to be removed from libpng-1.4.0 */
return -1;
}
#endif /* PNG_1_0_X */
@@ -791,9 +800,9 @@
png_size_t PNGAPI
png_convert_size(size_t size)
{
- if (size > (png_size_t)-1)
- PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
- return ((png_size_t)size);
+ if (size > (png_size_t)-1)
+ PNG_ABORT(); /* We haven't got access to png_ptr, so no png_error() */
+ return ((png_size_t)size);
}
#endif /* PNG_SIZE_T */
@@ -802,43 +811,44 @@
#if !defined(PNG_NO_CHECK_cHRM)
/*
- Multiply two 32-bit numbers, V1 and V2, using 32-bit
- arithmetic, to produce a 64 bit result in the HI/LO words.
-
- A B
- x C D
- ------
- AD || BD
-AC || CB || 0
-
- where A and B are the high and low 16-bit words of V1,
- C and D are the 16-bit words of V2, AD is the product of
- A and D, and X || Y is (X << 16) + Y.
+ * Multiply two 32-bit numbers, V1 and V2, using 32-bit
+ * arithmetic, to produce a 64 bit result in the HI/LO words.
+ *
+ * A B
+ * x C D
+ * ------
+ * AD || BD
+ * AC || CB || 0
+ *
+ * where A and B are the high and low 16-bit words of V1,
+ * C and D are the 16-bit words of V2, AD is the product of
+ * A and D, and X || Y is (X << 16) + Y.
*/
void png_64bit_product (long v1, long v2, unsigned long *hi_product,
unsigned long *lo_product)
{
- int a, b, c, d;
- long lo, hi, x, y;
+ int a, b, c, d;
+ long lo, hi, x, y;
- a = (v1 >> 16) & 0xffff;
- b = v1 & 0xffff;
- c = (v2 >> 16) & 0xffff;
- d = v2 & 0xffff;
+ a = (v1 >> 16) & 0xffff;
+ b = v1 & 0xffff;
+ c = (v2 >> 16) & 0xffff;
+ d = v2 & 0xffff;
- lo = b * d; /* BD */
- x = a * d + c * b; /* AD + CB */
- y = ((lo >> 16) & 0xffff) + x;
+ lo = b * d; /* BD */
+ x = a * d + c * b; /* AD + CB */
+ y = ((lo >> 16) & 0xffff) + x;
- lo = (lo & 0xffff) | ((y & 0xffff) << 16);
- hi = (y >> 16) & 0xffff;
+ lo = (lo & 0xffff) | ((y & 0xffff) << 16);
+ hi = (y >> 16) & 0xffff;
- hi += a * c; /* AC */
+ hi += a * c; /* AC */
- *hi_product = (unsigned long)hi;
- *lo_product = (unsigned long)lo;
+ *hi_product = (unsigned long)hi;
+ *lo_product = (unsigned long)lo;
}
+
int /* private */
png_check_cHRM_fixed(png_structp png_ptr,
png_fixed_point white_x, png_fixed_point white_y, png_fixed_point red_x,
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