20060303a

1 files changed, 70 insertions, 0 deletions

diff --git a/libdraw/loadimage.c b/libdraw/loadimage.c
new file mode 100644
index 00000000..6c00a250
--- /dev/null
+++ b/libdraw/loadimage.c
@@ -0,0 +1,70 @@
+#include "lib9.h"
+#include "draw.h"
+#include "kernel.h"
+
+int
+loadimage(Image *i, Rectangle r, uchar *data, int ndata)
+{
+	long dy;
+	int n, bpl, roff, dstroff, lskip, llen, y;
+	uchar *a;
+	int chunk;
+	Rectangle dstr;
+
+	chunk = i->display->bufsize - 64;
+
+	bpl = bytesperline(r, i->depth);
+	n = bpl*Dy(r);
+	if(n > ndata){
+		kwerrstr("loadimage: insufficient data");
+		return -1;
+	}
+
+	dstr = r;
+	rectclip(&dstr, i->r);
+	rectclip(&dstr, i->clipr);
+
+	if (!rectinrect(dstr, i->r))
+		return 0;
+
+	roff = (r.min.x*i->depth)>>3;
+	dstroff = dstr.min.x * i->depth >> 3;
+	lskip = dstroff - roff;
+	llen = (dstr.max.x*i->depth + 7 >> 3) - dstroff;
+	data += (dstr.min.y - r.min.y) * bpl + lskip;
+
+	ndata = 0;
+	while(dstr.max.y > dstr.min.y){
+		dy = dstr.max.y - dstr.min.y;
+		if(dy*llen > chunk)
+			dy = chunk/llen;
+		if(dy <= 0){
+			kwerrstr("loadimage: image too wide for buffer");
+			return -1;
+		}
+		n = dy*llen;
+		a = bufimage(i->display, 21+n);
+		if(a == nil){
+			kwerrstr("bufimage failed");
+			return -1;
+		}
+		a[0] = 'y';
+		BPLONG(a+1, i->id);
+		BPLONG(a+5, dstr.min.x);
+		BPLONG(a+9, dstr.min.y);
+		BPLONG(a+13, dstr.max.x);
+		BPLONG(a+17, dstr.min.y+dy);
+		a += 21;
+		for (y = 0; y < dy; y++) {
+			memmove(a, data, llen);
+			a += llen;
+			ndata += llen;
+			data += bpl;
+		}
+		dstr.min.y += dy;
+	}
+	if(flushimage(i->display, 0) < 0)
+		return -1;
+	return ndata;
+}
+