* dither.c: add an example program for dithering methods.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2652 92316355-f0b4-4df1-b90c-862c8a59935f

.gitignore

@@ -11,6 +11,7 @@ libtool
 pipi/pipi.pc
 genethumb/genethumb
 examples/blur
+examples/dither
 examples/edd
 examples/img2rubik
 test/u8tof32tou8

examples/Makefile.am

@@ -2,11 +2,14 @@
 
 AM_CPPFLAGS = -I$(top_srcdir) -I$(top_srcdir)/pipi
 
-bin_PROGRAMS = blur edd img2rubik
+bin_PROGRAMS = blur dither edd img2rubik
 
 blur_SOURCES = blur.c
 blur_LDADD = ../pipi/libpipi.la
 
+dither_SOURCES = dither.c
+dither_LDADD = ../pipi/libpipi.la
+
 edd_SOURCES = edd.c
 edd_LDADD = ../pipi/libpipi.la
 

examples/dither.c

@@ -0,0 +1,48 @@
+#include "config.h"
+#include "common.h"
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <pipi.h>
+
+int main(int argc, char *argv[])
+{
+    char *srcname = NULL, *dstname = NULL;
+    pipi_image_t *img, *newimg;
+
+    if(argc < 3)
+    {
+        fprintf(stderr, "%s: too few arguments\n", argv[0]);
+        fprintf(stderr, "Usage: %s <src> <method> <dest>\n", argv[0]);
+        fprintf(stderr, "Where <method> is one of:\n");
+        fprintf(stderr, "  1   Floyd-Steinberg\n");
+        fprintf(stderr, "  2   Direct binary search\n");
+        return EXIT_FAILURE;
+    }
+
+    srcname = argv[1];
+    dstname = argv[3];
+
+    img = pipi_load(srcname);
+    pipi_getpixels(img, PIPI_PIXELS_RGBA_F);
+
+    switch(atoi(argv[2]))
+    {
+        case 2:
+            newimg = pipi_dbs(img); break;
+        case 1:
+        default:
+            newimg = pipi_floydsteinberg(img); break;
+    }
+
+    pipi_free(img);
+
+    pipi_getpixels(newimg, PIPI_PIXELS_RGBA_F);
+    pipi_save(newimg, dstname);
+    pipi_free(newimg);
+
+    return 0;
+}
+