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author | rsc <devnull@localhost> | 2003-09-30 17:47:42 +0000 |
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committer | rsc <devnull@localhost> | 2003-09-30 17:47:42 +0000 |
commit | 76193d7cb0457807b2f0b95f909ab5de19480cd7 (patch) | |
tree | 97e538c7e38181431e90289a0fe8b6b7ce1f8f3c /src/libdraw/ml-lsetrefresh.c | |
parent | ed7c8e8d02c02bdbff1e88a6d8d1419f39af48ad (diff) | |
download | plan9port-76193d7cb0457807b2f0b95f909ab5de19480cd7.tar.gz plan9port-76193d7cb0457807b2f0b95f909ab5de19480cd7.tar.bz2 plan9port-76193d7cb0457807b2f0b95f909ab5de19480cd7.zip |
Initial revision
Diffstat (limited to 'src/libdraw/ml-lsetrefresh.c')
-rw-r--r-- | src/libdraw/ml-lsetrefresh.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/src/libdraw/ml-lsetrefresh.c b/src/libdraw/ml-lsetrefresh.c new file mode 100644 index 00000000..44079be2 --- /dev/null +++ b/src/libdraw/ml-lsetrefresh.c @@ -0,0 +1,35 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> +#include <memdraw.h> +#include <memlayer.h> + +int +memlsetrefresh(Memimage *i, Refreshfn fn, void *ptr) +{ + Memlayer *l; + + l = i->layer; + if(l->refreshfn!=nil && fn!=nil){ /* just change functions */ + l->refreshfn = fn; + l->refreshptr = ptr; + return 1; + } + + if(l->refreshfn == nil){ /* is using backup image; just free it */ + freememimage(l->save); + l->save = nil; + l->refreshfn = fn; + l->refreshptr = ptr; + return 1; + } + + l->save = allocmemimage(i->r, i->chan); + if(l->save == nil) + return 0; + /* easiest way is just to update the entire save area */ + l->refreshfn(i, i->r, l->refreshptr); + l->refreshfn = nil; + l->refreshptr = nil; + return 1; +} |