diff options
Diffstat (limited to 'Build/source/libs/libpng/libpng-src/libpng-manual.txt')
| -rw-r--r-- | Build/source/libs/libpng/libpng-src/libpng-manual.txt | 35 |
1 files changed, 26 insertions, 9 deletions
diff --git a/Build/source/libs/libpng/libpng-src/libpng-manual.txt b/Build/source/libs/libpng/libpng-src/libpng-manual.txt index 1e838bd7722..f9b14ad2d4a 100644 --- a/Build/source/libs/libpng/libpng-src/libpng-manual.txt +++ b/Build/source/libs/libpng/libpng-src/libpng-manual.txt @@ -1,6 +1,6 @@ libpng-manual.txt - A description on how to use and modify libpng - libpng version 1.6.21 - January 15, 2016 + libpng version 1.6.22 - May 26, 2016 Updated and distributed by Glenn Randers-Pehrson <glennrp at users.sourceforge.net> Copyright (c) 1998-2016 Glenn Randers-Pehrson @@ -11,7 +11,7 @@ libpng-manual.txt - A description on how to use and modify libpng Based on: - libpng versions 0.97, January 1998, through 1.6.21 - January 15, 2016 + libpng versions 0.97, January 1998, through 1.6.22 - May 26, 2016 Updated and distributed by Glenn Randers-Pehrson Copyright (c) 1998-2016 Glenn Randers-Pehrson @@ -2842,7 +2842,7 @@ filter types. PNG_FILTER_UP | PNG_FILTER_VALUE_UP | PNG_FILTER_AVG | PNG_FILTER_VALUE_AVG | PNG_FILTER_PAETH | PNG_FILTER_VALUE_PAETH| - PNG_ALL_FILTERS); + PNG_ALL_FILTERS | PNG_FAST_FILTERS); If an application wants to start and stop using particular filters during compression, it should start out with all of the filters (to ensure that @@ -4103,6 +4103,13 @@ be written: Write the image to the named file. + int png_image_write_to_memory (png_imagep image, void *memory, + png_alloc_size_t * PNG_RESTRICT memory_bytes, + int convert_to_8_bit, const void *buffer, ptrdiff_t row_stride, + const void *colormap)); + + Write the image to memory. + int png_image_write_to_stdio(png_imagep image, FILE *file, int convert_to_8_bit, const void *buffer, png_int_32 row_stride, const void *colormap) @@ -4380,8 +4387,9 @@ for any images with bit depths less than 8 bits/pixel. The 'method' parameter sets the main filtering method, which is currently only '0' in the PNG 1.2 specification. The 'filters' parameter sets which filter(s), if any, should be used for each -scanline. Possible values are PNG_ALL_FILTERS and PNG_NO_FILTERS -to turn filtering on and off, respectively. +scanline. Possible values are PNG_ALL_FILTERS, PNG_NO_FILTERS, +or PNG_FAST_FILTERS to turn filtering on and off, or to turn on +just the fast-decoding subset of filters, respectively. Individual filter types are PNG_FILTER_NONE, PNG_FILTER_SUB, PNG_FILTER_UP, PNG_FILTER_AVG, PNG_FILTER_PAETH, which can be bitwise @@ -4395,12 +4403,19 @@ means the first row must always be adaptively filtered, because libpng currently does not allocate the filter buffers until png_write_row() is called for the first time.) - filters = PNG_FILTER_NONE | PNG_FILTER_SUB + filters = PNG_NO_FILTERS; + filters = PNG_ALL_FILTERS; + filters = PNG_FAST_FILTERS; + + or + + filters = PNG_FILTER_NONE | PNG_FILTER_SUB | PNG_FILTER_UP | PNG_FILTER_AVG | - PNG_FILTER_PAETH | PNG_ALL_FILTERS; + PNG_FILTER_PAETH; png_set_filter(png_ptr, PNG_FILTER_TYPE_BASE, filters); + The second parameter can also be PNG_INTRAPIXEL_DIFFERENCING if you are writing a PNG to be embedded in a MNG @@ -4775,7 +4790,8 @@ There are no substantial API changes between the non-deprecated parts of the 1.4.5 API and the 1.5.0 API; however, the ability to directly access members of the main libpng control structures, png_struct and png_info, deprecated in earlier versions of libpng, has been completely removed from -libpng 1.5. +libpng 1.5, and new private "pngstruct.h", "pnginfo.h", and "pngdebug.h" +header files were created. We no longer include zlib.h in png.h. The include statement has been moved to pngstruct.h, where it is not accessible by applications. Applications that @@ -5015,6 +5031,7 @@ includes the following: png_image_free() write functions png_image_write_to_file() + png_image_write_to_memory() png_image_write_to_stdio() Starting with libpng-1.6.0, you can configure libpng to prefix all exported @@ -5328,7 +5345,7 @@ Since the PNG Development group is an ad-hoc body, we can't make an official declaration. This is your unofficial assurance that libpng from version 0.71 and -upward through 1.6.21 are Y2K compliant. It is my belief that earlier +upward through 1.6.22 are Y2K compliant. It is my belief that earlier versions were also Y2K compliant. Libpng only has two year fields. One is a 2-byte unsigned integer |