1 files changed, 69 insertions, 0 deletions
diff --git a/sys/pmio/pmglp.gx b/sys/pmio/pmglp.gx
new file mode 100644
index 00000000..26c6b2e0
--- /dev/null
+++ b/sys/pmio/pmglp.gx
@@ -0,0 +1,69 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<pmset.h>
+include	<plio.h>
+
+# PM_GLP -- Get a line segment as a pixel array, applying the given ROP to
+# combine the pixels with those of the output array.
+
+procedure pm_glp$t (pl, v, px_dst, px_depth, npix, rop)
+
+pointer	pl			#I mask descriptor
+long	v[PL_MAXDIM]		#I vector coords of line segment
+PIXEL	px_dst[ARB]		#O output pixel array
+int	px_depth		#I pixel depth, bits
+int	npix			#I number of pixels desired
+int	rop			#I rasterop
+
+int	temp, np, step, xstep
+pointer	sp, px_src, px_out, im
+include	"../pmio.com"
+
+begin
+	im = PM_REFIM(pl)
+	if (PM_MAPXY(pl) == NO) {
+	    call pl_glp$t (pl, v, px_dst, px_depth, npix, rop)
+	    return
+	}
+
+	call smark (sp)
+
+	# Determine physical coords of line segment.
+	call amovl (v, v3, PM_MAXDIM)
+	call imaplv (im, v3, v1, PM_MAXDIM)
+	v3[1] = v3[1] + npix - 1
+	call imaplv (im, v3, v2, PM_MAXDIM)
+
+	# Get line scaling parameters.
+	if (npix <= 1)
+	    xstep = 1
+	else
+	    xstep = (v2[1] - v1[1]) / (npix - 1)
+	step = xstep
+	if (xstep < 0) {
+	    temp = v1[1];  v1[1] = v2[1];  v2[1] = temp
+	    step = -step
+	}
+
+	# Extract the pixels.
+	np = (npix - 1) * step + 1
+	call salloc (px_src, np, TY_PIXEL)
+	call pl_glp$t (pl, v1, Mem$t[px_src], 0, np, PIX_SRC)
+
+	# Subsample and flip if necessary.
+	if (step > 1)
+	    call imsamp (Mem$t[px_src], Mem$t[px_src], npix, SZ_PIXEL, step)
+	if (xstep < 0)
+	    call imaflp (Mem$t[px_src], npix, SZ_PIXEL)
+
+	if (!R_NEED_DST(rop))
+	    call amov$t (Mem$t[px_src], px_dst, npix)
+	else {
+	    call salloc (px_out, npix, TY_PIXEL)
+	    call pl_pixrop$t (Mem$t[px_src], 1, PL_MAXVAL(pl), px_dst, 1,
+		MV(px_depth), npix, rop)
+	    call amov$t (Mem$t[px_out], px_dst, npix)
+	}
+
+	call sfree (sp)
+end