diff options
| -rw-r--r-- | libpng.3 | 90 |
1 files changed, 47 insertions, 43 deletions
@@ -3768,17 +3768,6 @@ selection of assembler code features: We replaced all of these functions with simple stubs in libpng-1.2.20, when the Intel assembler code was removed due to a licensing issue. -.SH IX. Changes to Libpng from version 1.0.x/1.2.x to 1.4.x - -Private libpng prototypes and macro definitions were moved from -png.h and pngconf.h into a new pngpriv.h header file. - -Support for the iTXt chunk has been enabled by default. - -Support for global arrays was removed. - -Some obsolete/deprecated macros and functions have been removed. - These macros are deprecated: PNG_READ_TRANSFORMS_NOT_SUPPORTED @@ -3797,12 +3786,6 @@ They have been replaced, respectively, by: PNG_NO_READ_ANCILLARY_CHUNKS PNG_NO_WRITE_ANCILLARY_CHUNKS -The PNG_1_0_X and PNG_1_2_X macros were eliminated. - -The PNG_LEGACY_SUPPORTED macro was eliminated. - -Many WIN32_WCE #ifdefs were removed. - PNG_MAX_UINT was replaced with PNG_UINT_31_MAX. It has been deprecated since libpng-1.0.16 and libpng-1.2.6. @@ -3812,20 +3795,12 @@ was replaced with !png_sig_cmp(sig, 0, num) It has been deprecated since libpng-0.90. -The functions png_read_init(info_ptr), png_write_init(info_ptr), -png_info_init(info_ptr), png_read_destroy(), and png_write_destroy() -have been removed. They have been deprecated since libpng-0.95. - The function png_set_gray_1_2_4_to_8() which also expands tRNS to alpha was replaced with png_set_expand_gray_1_2_4_to_8() which does not. It has been deprecated since libpng-1.0.18 and 1.2.9. -Support for numbered error messages was removed by default, since we -never got around to actually numbering the error messages. The function -png_set_strip_error_numbers() was removed from the library by default. - Functions png_set_benign_errors(), png_benign_error(), and png_chunk_benign_error() were added. @@ -3837,6 +3812,51 @@ were added to the library. We implemented support for I/O states. Added png_ptr member io_state, and functions png_get_io_chunk_name() and png_get_io_state() in pngget.c +The png_calloc() function was added and is used in place of +of "png_malloc(); png_memset();" except in the case in png_read_png() +where the array consists of pointers; in this case a "for" loop is used +after the png_malloc() to set the pointers to NULL. + +We added PNG_TRANSFORM_GRAY_TO_RGB to the available high-level +input transforms. + +We added the png_set_premultiply_alpha and +png_do_read_premultiply_alpha() functions. + +The call to png_do_chop() in pngrtran.c, which reduces 16-bit input +files to 8-bit bit depth, was relocated ahead of the building +of gamma tables. This allows us to build 8-bit tables instead +of 16-bit tables, when only 8-bit tables are needed. This avoids +wasting some computing resources when the application has called +the png_set_strip_16() function and encounters a 16-bit PNG file. + +Checking for and reporting of errors in the IHDR chunk is more thorough. + +.SH IX. Changes to Libpng from version 1.0.x/1.2.x to 1.4.x + +Private libpng prototypes and macro definitions were moved from +png.h and pngconf.h into a new pngpriv.h header file. + +Support for the iTXt chunk has been enabled by default. + +Support for global arrays was removed. + +Some obsolete/deprecated macros and functions have been removed. + +The PNG_1_0_X and PNG_1_2_X macros were eliminated. + +The PNG_LEGACY_SUPPORTED macro was eliminated. + +Many WIN32_WCE #ifdefs were removed. + +The functions png_read_init(info_ptr), png_write_init(info_ptr), +png_info_init(info_ptr), png_read_destroy(), and png_write_destroy() +have been removed. They have been deprecated since libpng-0.95. + +Support for numbered error messages was removed by default, since we +never got around to actually numbering the error messages. The function +png_set_strip_error_numbers() was removed from the library by default. + The png_permit_empty_plte() was removed. It has been deprecated since libpng-1.0.9. Use png_permit_mng_features() instead. @@ -3861,28 +3881,11 @@ allocates. The png_zalloc() and png_zfree() functions are no longer exported. -The png_calloc() function was added and is used in place of -of "png_malloc(); png_memset();" except in the case in png_read_png() -where the array consists of pointers; in this case a "for" loop is used -after the png_malloc() to set the pointers to NULL. - We removed the trailing '.' from the warning and error messages. -We added PNG_TRANSFORM_GRAY_TO_RGB to the available high-level -input transforms. - The png_struct and info_struct members "trans" and "trans_values" were changed to "trans_alpha" and "trans_color", respectively. -The call to png_do_chop() in pngrtran.c, which reduces 16-bit input -files to 8-bit bit depth, was relocated ahead of the building -of gamma tables. This allows us to build 8-bit tables instead -of 16-bit tables, when only 8-bit tables are needed. This avoids -wasting some computing resources when the application has called -the png_set_strip_16() function and encounters a 16-bit PNG file. - -Checking for and reporting of errors in the IHDR chunk is more thorough. - .SH X. Detecting libpng The png_get_io_ptr() function has been present since libpng-0.88, has never @@ -3990,7 +3993,8 @@ We mark all non-exported functions with "/* PRIVATE */"": } The prototypes for non-exported functions (except for those in -pngtest) appear in pngpriv.h +pngtest) appear in +pngpriv.h above the comment that says /* Maintainer: Put new private prototypes here ^ and in libpngpf.3 */ |