BITMAP_PARSE_USER(9) Basic Kernel Library Functions BITMAP_PARSE_USER(9)NAME
bitmap_parse_user - convert an ASCII hex string in a user buffer into a bitmap
SYNOPSIS
int bitmap_parse_user(const char __user * ubuf, unsigned int ulen, unsigned long * maskp, int nmaskbits);
ARGUMENTS
ubuf
pointer to user buffer containing string.
ulen
buffer size in bytes. If string is smaller than this then it must be terminated with a .
maskp
pointer to bitmap array that will contain result.
nmaskbits
size of bitmap, in bits.
DESCRIPTION
Wrapper for __bitmap_parse, providing it with user buffer.
We cannot have this as an inline function in bitmap.h because it needs linux/uaccess.h to get the access_ok declaration and this causes
cyclic dependencies.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 BITMAP_PARSE_USER(9)
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create_sub_zbuffer(3alleg4) Allegro manual create_sub_zbuffer(3alleg4)NAME
create_sub_zbuffer - Creates a sub-z-buffer. Allegro game programming library.
SYNOPSIS
#include <allegro.h>
ZBUFFER *create_sub_zbuffer(ZBUFFER *parent, int x, int y, int width, int height);
DESCRIPTION
Creates a sub-z-buffer, ie. a z-buffer sharing drawing memory with a pre-existing z-buffer, but possibly with a different size. The same
rules as for sub-bitmaps apply: the sub-z-buffer width and height can extend beyond the right and bottom edges of the parent (they will be
clipped), but the origin point must lie within the parent region.
When drawing z-buffered to a bitmap, the top left corner of the bitmap is always mapped to the top left corner of the current z-buffer. So
this function is primarily useful if you want to draw to a sub-bitmap and use the corresponding sub-area of the z-buffer. In other cases,
eg. if you just want to draw to a sub-bitmap of screen (and not to other parts of screen), then you would usually want to create a normal
z-buffer (not sub-z-buffer) the size of the visible screen. You don't need to first create a z-buffer the size of the virtual screen and
then a sub-z-buffer of that.
RETURN VALUE
Returns the pointer to the sub ZBUFFER or NULL if there was an error. Remember to destroy the ZBUFFER once you are done with it, to avoid
having memory leaks.
SEE ALSO create_zbuffer(3alleg4), create_sub_bitmap(3alleg4), destroy_zbuffer(3alleg4)Allegro version 4.4.2 create_sub_zbuffer(3alleg4)
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