1 files changed, 112 insertions, 0 deletions
diff --git a/editor/ppmdim.c b/editor/ppmdim.c
new file mode 100644
index 00000000..4e64965a
--- /dev/null
+++ b/editor/ppmdim.c
@@ -0,0 +1,112 @@
+
+/*********************************************************************/
+/* ppmdim -  dim a picture down to total blackness                   */
+/* Frank Neumann, October 1993                                       */
+/* V1.4 16.11.1993                                                   */
+/*                                                                   */
+/* version history:                                                  */
+/* V1.0 ~ 15.August 1993    first version                            */
+/* V1.1 03.09.1993          uses ppm libs & header files             */
+/* V1.2 03.09.1993          integer arithmetics instead of float     */
+/*                          (gains about 50 % speed up)              */
+/* V1.3 10.10.1993          reads only one line at a time - this     */
+/*                          saves LOTS of memory on big pictures     */
+/* V1.4 16.11.1993          Rewritten to be NetPBM.programming con-  */
+/*                          forming                                  */
+/*********************************************************************/
+
+#include "ppm.h"
+
+/* global variables */
+#ifdef AMIGA
+static char *version = "$VER: ppmdim 1.4 (16.11.93)"; /* Amiga version identification */
+#endif
+
+/**************************/
+/* start of main function */
+/**************************/
+int main(argc, argv)
+int argc;
+char *argv[];
+{
+	FILE* ifp;
+	int argn, rows, cols, format, i = 0, j = 0;
+	pixel *srcrow, *destrow;
+	pixel *pP = NULL, *pP2 = NULL;
+	pixval maxval;
+	double dimfactor;
+	long longfactor;
+	const char * const usage = "dimfactor [ppmfile]\n        dimfactor: 0.0 = total blackness, 1.0 = original picture\n";
+
+	/* parse in 'default' parameters */
+	ppm_init(&argc, argv);
+
+	argn = 1;
+
+	/* parse in dim factor */
+	if (argn == argc)
+		pm_usage(usage);
+	if (sscanf(argv[argn], "%lf", &dimfactor) != 1)
+		pm_usage(usage);
+	if (dimfactor < 0.0 || dimfactor > 1.0)
+		pm_error("dim factor must be in the range from 0.0 to 1.0 ");
+	++argn;
+
+	/* parse in filename (if present, stdin otherwise) */
+	if (argn != argc)
+	{
+		ifp = pm_openr(argv[argn]);
+		++argn;
+	}
+	else
+		ifp = stdin;
+
+	if (argn != argc)
+		pm_usage(usage);
+
+	/* read first data from file */
+	ppm_readppminit(ifp, &cols, &rows, &maxval, &format);
+
+	/* no error checking required here, ppmlib does it all for us */
+	srcrow = ppm_allocrow(cols);
+
+	longfactor = (long)(dimfactor * 65536);
+
+	/* allocate a row of pixel data for the new pixels */
+	destrow = ppm_allocrow(cols);
+
+	ppm_writeppminit(stdout, cols, rows, maxval, 0);
+
+	/** now do the dim'ing **/
+	/* the 'float' parameter for dimming is sort of faked - in fact, we */
+	/* convert it to a range from 0 to 65536 for integer math. Shouldn't */
+	/* be something you'll have to worry about, though. */
+
+	for (i = 0; i < rows; i++)
+	{
+		ppm_readppmrow(ifp, srcrow, cols, maxval, format);
+
+		pP = srcrow;
+		pP2 = destrow;
+
+		for (j = 0; j < cols; j++)
+		{
+			PPM_ASSIGN(*pP2, (PPM_GETR(*pP) * longfactor) >> 16,
+							 (PPM_GETG(*pP) * longfactor) >> 16,
+							 (PPM_GETB(*pP) * longfactor) >> 16);
+
+			pP++;
+			pP2++;
+		}
+
+		/* write out one line of graphic data */
+		ppm_writeppmrow(stdout, destrow, cols, maxval, 0);
+	}
+
+	pm_close(ifp);
+	ppm_freerow(srcrow);
+	ppm_freerow(destrow);
+
+	exit(0);
+}
+