Initial commit

1 files changed, 49 insertions, 0 deletions

diff --git a/pkg/dataio/export/bltins/exppm.x b/pkg/dataio/export/bltins/exppm.x
new file mode 100644
index 00000000..4dab4727
--- /dev/null
+++ b/pkg/dataio/export/bltins/exppm.x
@@ -0,0 +1,49 @@
+include <mach.h>
+include "../export.h"
+
+
+# EX_PPM - Write the evaluated expressions as a PPM format file.
+
+procedure ex_ppm (ex)
+
+pointer	ex					#i task struct pointer
+
+pointer	sp, hdr
+int	len, flags
+
+int	strlen()
+
+begin
+	# Check to see that we have the correct number of expressions to
+	# write this format.
+	flags = EX_OUTFLAGS(ex)
+	if (EX_NEXPR(ex) != 3)
+	    call error (7, "Invalid number of expressions for PPM file.")
+	if (bitset(flags, OF_LINE) || bitset (flags, LINE_STORAGE))
+	    call error (7, "Line storage illegal for PPM file.")
+
+        # Write the header to the file.
+        call smark (sp)
+        call salloc (hdr, SZ_LINE, TY_CHAR)
+        call aclrc (Memc[hdr], SZ_LINE)
+
+	# If we have an odd number of pixels we can't correctly write the
+	# last column to the file, so truncate the column in the output image.
+        if (mod (EX_NCOLS(ex),2) == 1)
+            EX_OCOLS(ex) = EX_OCOLS(ex) - 1
+
+        call sprintf (Memc[hdr], SZ_LINE, "P6\n%-6d  %-6d\n255\n")
+            call pargi (EX_OCOLS(ex))
+            call pargi (EX_OROWS(ex))
+	len = strlen (Memc[hdr])
+        call strpak (Memc[hdr], Memc[hdr], SZ_LINE)
+        call write (EX_FD(ex), Memc[hdr], len/SZB_CHAR)
+        call sfree (sp)
+
+	# Fix the output pixel type to single bytes.
+	call ex_do_outtype (ex, "b1")
+	EX_OUTFLAGS(ex) = or (EX_OUTFLAGS(ex), OF_FLIPY)
+
+	# Finally, evaluate the expressions and write the image.
+	call ex_px_interleave (ex)
+end