* Checking in an old Rubik's cube dithering test.

git-svn-id: file:///srv/caca.zoy.org/var/lib/svn/libpipi/trunk@2262 92316355-f0b4-4df1-b90c-862c8a59935f

.gitignore

@@ -10,6 +10,7 @@ Makefile
 libtool
 pipi/pipi.pc
 genethumb/genethumb
+examples/img2rubik
 stamp-h1
 .auto
 .deps

Makefile.am

@@ -1,6 +1,6 @@
 # $Id$
 
-SUBDIRS = pipi genethumb
+SUBDIRS = pipi genethumb examples
 
 EXTRA_DIST = bootstrap common.h
 AUTOMAKE_OPTIONS = dist-bzip2

configure.ac

@@ -108,6 +108,7 @@ AC_CONFIG_FILES([
   Makefile
   pipi/Makefile
   genethumb/Makefile
+  examples/Makefile
 ])
 AC_CONFIG_FILES([
   pipi/pipi.pc

examples/Makefile.am

@@ -0,0 +1,9 @@
+# $Id$
+
+AM_CPPFLAGS = -I$(top_srcdir) -I$(top_srcdir)/pipi
+
+bin_PROGRAMS = img2rubik
+
+img2rubik_SOURCES = img2rubik.c
+img2rubik_LDADD = ../pipi/libpipi.la
+

examples/img2rubik.c

@@ -0,0 +1,31 @@
+#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;
+
+    if(argc < 3)
+    {
+        fprintf(stderr, "%s: too few arguments\n", argv[0]);
+        return EXIT_FAILURE;
+    }
+
+    srcname = argv[1];
+    dstname = argv[2];
+
+    img = pipi_load(srcname);
+    pipi_test(img);
+    pipi_save(img, dstname);
+    pipi_free(img);
+
+    return 0;
+}
+

pipi/Makefile.am

@@ -24,6 +24,7 @@ libpipi_la_SOURCES = \
 	pixels.c \
 	codec.c \
 	resize.c \
+	test.c \
 	$(codec_sources) \
 	$(NULL)
 libpipi_la_CFLAGS = $(codec_cflags)

pipi/pipi.h

@@ -40,6 +40,8 @@ extern int pipi_setpixel(pipi_image_t *img, int x, int y,
 
 extern pipi_image_t *pipi_resize(pipi_image_t const *, int, int);
 
+extern void pipi_test(pipi_image_t *);
+
 #ifdef __cplusplus
 }
 #endif

pipi/test.c

@@ -0,0 +1,60 @@
+/*
+ *  libpipi       Proper image processing implementation library
+ *  Copyright (c) 2004-2008 Sam Hocevar <sam@zoy.org>
+ *                All Rights Reserved
+ *
+ *  $Id$
+ *
+ *  This library is free software. It comes without any warranty, to
+ *  the extent permitted by applicable law. You can redistribute it
+ *  and/or modify it under the terms of the Do What The Fuck You Want
+ *  To Public License, Version 2, as published by Sam Hocevar. See
+ *  http://sam.zoy.org/wtfpl/COPYING for more details.
+ */
+
+/*
+ * test.c: my repostiroy of test functions
+ */
+
+#include "config.h"
+#include "common.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "pipi.h"
+#include "pipi_internals.h"
+
+void pipi_test(pipi_image_t *img)
+{
+    int x, y;
+
+    for(y = 0; y < img->height; y++)
+    {
+        for(x = 0; x < img->width; x++)
+        {
+            double r = 0, g = 0, b = 0;
+
+            pipi_getpixel(img, x, y, &r, &g, &b);
+            if(r + g + b == 0)
+                r = g = b = 1. / 3;
+            else if(r + g + b < 1.)
+            {
+                double d = (1. - r - g - b) / 3;
+                r += d; g += d; b += d;
+            }
+            else if(2. - r + g - b < 1.)
+            {
+                double d = (-1. + r - g + b) / 3;
+                r -= d; g += d; b -= d;
+            }
+            else if(2. + r - g - b < 1.)
+            {
+                double d = (-1. - r + g + b) / 3;
+                r += d; g -= d; b -= d;
+            }
+            pipi_setpixel(img, x, y, r, g, b);
+        }
+    }
+}
+