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author | rsc <devnull@localhost> | 2006-06-25 18:58:06 +0000 |
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committer | rsc <devnull@localhost> | 2006-06-25 18:58:06 +0000 |
commit | 324891a5579d6f504201a6107369c64dab245a98 (patch) | |
tree | 3069429c14484b100d86dd5a3b1013565bf5db6c /src/libmemdraw/load.c | |
parent | 9361131304f39db29b1bec59d881e585035ec93c (diff) | |
download | plan9port-324891a5579d6f504201a6107369c64dab245a98.tar.gz plan9port-324891a5579d6f504201a6107369c64dab245a98.tar.bz2 plan9port-324891a5579d6f504201a6107369c64dab245a98.zip |
separate out
Diffstat (limited to 'src/libmemdraw/load.c')
-rw-r--r-- | src/libmemdraw/load.c | 72 |
1 files changed, 72 insertions, 0 deletions
diff --git a/src/libmemdraw/load.c b/src/libmemdraw/load.c new file mode 100644 index 00000000..6788fa90 --- /dev/null +++ b/src/libmemdraw/load.c @@ -0,0 +1,72 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> +#include <memdraw.h> + +int +_loadmemimage(Memimage *i, Rectangle r, uchar *data, int ndata) +{ + int y, l, lpart, rpart, mx, m, mr; + uchar *q; + + if(!rectinrect(r, i->r)) + return -1; + l = bytesperline(r, i->depth); + if(ndata < l*Dy(r)) + return -1; + ndata = l*Dy(r); + q = byteaddr(i, r.min); + mx = 7/i->depth; + lpart = (r.min.x & mx) * i->depth; + rpart = (r.max.x & mx) * i->depth; + m = 0xFF >> lpart; + /* may need to do bit insertion on edges */ + if(l == 1){ /* all in one byte */ + if(rpart) + m ^= 0xFF >> rpart; + for(y=r.min.y; y<r.max.y; y++){ + *q ^= (*data^*q) & m; + q += i->width*sizeof(u32int); + data++; + } + return ndata; + } + if(lpart==0 && rpart==0){ /* easy case */ + for(y=r.min.y; y<r.max.y; y++){ + memmove(q, data, l); + q += i->width*sizeof(u32int); + data += l; + } + return ndata; + } + mr = 0xFF ^ (0xFF >> rpart); + if(lpart!=0 && rpart==0){ + for(y=r.min.y; y<r.max.y; y++){ + *q ^= (*data^*q) & m; + if(l > 1) + memmove(q+1, data+1, l-1); + q += i->width*sizeof(u32int); + data += l; + } + return ndata; + } + if(lpart==0 && rpart!=0){ + for(y=r.min.y; y<r.max.y; y++){ + if(l > 1) + memmove(q, data, l-1); + q[l-1] ^= (data[l-1]^q[l-1]) & mr; + q += i->width*sizeof(u32int); + data += l; + } + return ndata; + } + for(y=r.min.y; y<r.max.y; y++){ + *q ^= (*data^*q) & m; + if(l > 2) + memmove(q+1, data+1, l-2); + q[l-1] ^= (data[l-1]^q[l-1]) & mr; + q += i->width*sizeof(u32int); + data += l; + } + return ndata; +} |