Initial commit

1 files changed, 68 insertions, 0 deletions

diff --git a/sys/gio/gim/gimrcmap.x b/sys/gio/gim/gimrcmap.x
new file mode 100644
index 00000000..8fb9f4d2
--- /dev/null
+++ b/sys/gio/gim/gimrcmap.x
@@ -0,0 +1,68 @@
+# Copyright(c) 1986 Association of Universities for Research in Astronomy Inc.
+
+include	<syserr.h>
+include	<gescape.h>
+include	<fset.h>
+include	<gio.h>
+
+# GIM_READCOLORMAP -- Read a segment of a colormap.  The number of cells
+# read is returned.  The number of cells read may be less than the request
+# size if the cells have not yet been allocated.
+
+int procedure gim_readcolormap (gp, colormap, first, maxelem, r, g, b)
+
+pointer	gp			#I graphics descriptor
+int	colormap		#I colormap number (0=screen)
+int	first			#I first colormap entry to be read
+int	maxelem			#I number of elements to read
+int	r[ARB],g[ARB],b[ARB]	#O RGB color values (0-255)
+
+pointer	sp, cm, ip
+int	ncells, nret, nchars, i
+short	gim[GIM_READCMAP_LEN]
+short	retval[GIM_RET_RCMAP_LEN]
+int	read()
+
+string	s_readcmap "gim_readcolormap"
+errchk	flush, read, syserrs
+
+begin
+	call smark (sp)
+	call gpl_flush()
+
+	gim[GIM_READCMAP_MP] = colormap
+	gim[GIM_READCMAP_FC] = first
+	gim[GIM_READCMAP_NC] = maxelem
+	call gescape (gp, GIM_READCMAP, gim, GIM_READCMAP_LEN)
+	call flush (GP_FD(gp))
+
+        # Get return value instruction header.
+        nchars = GIM_RET_RCMAP_LEN * SZ_SHORT
+        if (read (GP_FD(gp), retval, nchars) != nchars) {
+	    call fseti (GP_FD(gp), F_CANCEL, OK)
+            call syserrs (SYS_FREAD, s_readcmap)
+	}
+
+        ncells = retval[GIM_RET_RCMAP_NC]
+	call salloc (cm, ncells * 3, TY_SHORT)
+	nret = min (ncells, maxelem)
+
+	# Get the colormap data.
+	nchars = (ncells * 3) * SZ_SHORT
+        if (read (GP_FD(gp), Mems[cm], nchars) != nchars) {
+	    call fseti (GP_FD(gp), F_CANCEL, OK)
+            call syserrs (SYS_FREAD, s_readcmap)
+	}
+	
+	do i = 1, nret {
+	    ip = cm + (i - 1) * 3
+	    r[i] = Mems[ip+0]
+	    g[i] = Mems[ip+1]
+	    b[i] = Mems[ip+2]
+	}
+
+	call fseti (GP_FD(gp), F_CANCEL, OK)
+	call sfree (sp)
+
+	return (nret)
+end