mirror of
https://github.com/0intro/conterm
synced 2024-11-22 05:41:28 +03:00
73 lines
1.5 KiB
C
73 lines
1.5 KiB
C
#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(ulong);
|
|
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(ulong);
|
|
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(ulong);
|
|
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(ulong);
|
|
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(ulong);
|
|
data += l;
|
|
}
|
|
return ndata;
|
|
}
|