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979 to replace them with custom functions. See the discussion under
1127 one or more of them. This behavior can be changed with the
1180 chunk_list; if they are, libpng will process them normally anyway.
1763 If you want to replace the pixels, after reading them, with pixels
1798 PNG files store RGB pixels packed into 3 or 6 bytes. This code expands them
1799 into 4 or 8 bytes for windowing systems that need them in this format:
1921 the application will allow them to set it. One method of allowing the user
2021 way PCs store them):
2130 libpng can fill out those images or it can give them to you "as is".
2131 If you want them filled out, there are two ways to do that. The one
2144 8x8 grid to form a single image (although if you intend to combine them
2419 supplying them because it may make your life
2473 using the standard I/O functions, you will need to replace them with
2487 both "png_ptr"; you can call them anything you like, such as
2605 and remove them after the start of compression.
2638 wish to write them before the image, fill them in now, and flag that
2640 fill them until png_write_end(). For all the fields in png_info and
3021 two steps, and insert code to write your own chunk between them:
3087 first, the way PCs store them):
3130 when writing; you can set them to zero as shown.
3198 size. libpng will build these images for you, or you can do them
3199 yourself. If you want to build them yourself, see the PNG specification
3319 to provide the user with a means of changing them.
3386 Supplying NULL for the read, write, or flush functions sets them back
3390 of them, unless you have built libpng with PNG_NO_WRITE_FLUSH defined.
3480 the end for pointers (or at least look at them and be careful). Make
3487 interface, as described previously, and set them to be the error and
3489 in order to have them available during the structure initialization.
3695 Libpng can support some of these extensions. To enable them, use the
3713 them. You may wish to consider using libmng (available at
3746 to set the error callbacks AFTER png_read_init(), or to change them with
3888 png-mng-implement at lists.sourceforge.net or you can upload them to
3943 used them in the past in some now-abandoned MMX assembler
