diff options
Diffstat (limited to 'src/libdraw/md-cload.c')
-rw-r--r-- | src/libdraw/md-cload.c | 68 |
1 files changed, 68 insertions, 0 deletions
diff --git a/src/libdraw/md-cload.c b/src/libdraw/md-cload.c new file mode 100644 index 00000000..472caa6b --- /dev/null +++ b/src/libdraw/md-cload.c @@ -0,0 +1,68 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> +#include <memdraw.h> + +int +_cloadmemimage(Memimage *i, Rectangle r, uchar *data, int ndata) +{ + int y, bpl, c, cnt, offs; + uchar mem[NMEM], *memp, *omemp, *emem, *linep, *elinep, *u, *eu; + + if(!rectinrect(r, i->r)) + return -1; + bpl = bytesperline(r, i->depth); + u = data; + eu = data+ndata; + memp = mem; + emem = mem+NMEM; + y = r.min.y; + linep = byteaddr(i, Pt(r.min.x, y)); + elinep = linep+bpl; + for(;;){ + if(linep == elinep){ + if(++y == r.max.y) + break; + linep = byteaddr(i, Pt(r.min.x, y)); + elinep = linep+bpl; + } + if(u == eu){ /* buffer too small */ + return -1; + } + c = *u++; + if(c >= 128){ + for(cnt=c-128+1; cnt!=0 ;--cnt){ + if(u == eu){ /* buffer too small */ + return -1; + } + if(linep == elinep){ /* phase error */ + return -1; + } + *linep++ = *u; + *memp++ = *u++; + if(memp == emem) + memp = mem; + } + } + else{ + if(u == eu) /* short buffer */ + return -1; + offs = *u++ + ((c&3)<<8)+1; + if(memp-mem < offs) + omemp = memp+(NMEM-offs); + else + omemp = memp-offs; + for(cnt=(c>>2)+NMATCH; cnt!=0; --cnt){ + if(linep == elinep) /* phase error */ + return -1; + *linep++ = *omemp; + *memp++ = *omemp++; + if(omemp == emem) + omemp = mem; + if(memp == emem) + memp = mem; + } + } + } + return u-data; +} |