diff options
Diffstat (limited to 'src/libdraw/loadimage.c')
-rw-r--r-- | src/libdraw/loadimage.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/src/libdraw/loadimage.c b/src/libdraw/loadimage.c new file mode 100644 index 00000000..d8d8c40b --- /dev/null +++ b/src/libdraw/loadimage.c @@ -0,0 +1,54 @@ +#include <u.h> +#include <libc.h> +#include <draw.h> + +int +loadimage(Image *i, Rectangle r, uchar *data, int ndata) +{ + long dy; + int n, bpl; + uchar *a; + int chunk; + + chunk = i->display->bufsize - 64; + + if(!rectinrect(r, i->r)){ + werrstr("loadimage: bad rectangle"); + return -1; + } + bpl = bytesperline(r, i->depth); + n = bpl*Dy(r); + if(n > ndata){ + werrstr("loadimage: insufficient data"); + return -1; + } + ndata = 0; + while(r.max.y > r.min.y){ + dy = r.max.y - r.min.y; + if(dy*bpl > chunk) + dy = chunk/bpl; + if(dy <= 0){ + werrstr("loadimage: image too wide for buffer"); + return -1; + } + n = dy*bpl; + a = bufimage(i->display, 21+n); + if(a == nil){ + werrstr("bufimage failed"); + return -1; + } + a[0] = 'y'; + BPLONG(a+1, i->id); + BPLONG(a+5, r.min.x); + BPLONG(a+9, r.min.y); + BPLONG(a+13, r.max.x); + BPLONG(a+17, r.min.y+dy); + memmove(a+21, data, n); + ndata += n; + data += n; + r.min.y += dy; + } + if(flushimage(i->display, 0) < 0) + return -1; + return ndata; +} |