1 files changed, 86 insertions, 0 deletions
diff --git a/leptonica/prog/dither_reg.c b/leptonica/prog/dither_reg.c
new file mode 100644
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+++ b/leptonica/prog/dither_reg.c
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+/*====================================================================*
+ -  Copyright (C) 2001 Leptonica.  All rights reserved.
+ -
+ -  Redistribution and use in source and binary forms, with or without
+ -  modification, are permitted provided that the following conditions
+ -  are met:
+ -  1. Redistributions of source code must retain the above copyright
+ -     notice, this list of conditions and the following disclaimer.
+ -  2. Redistributions in binary form must reproduce the above
+ -     copyright notice, this list of conditions and the following
+ -     disclaimer in the documentation and/or other materials
+ -     provided with the distribution.
+ -
+ -  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ -  ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ -  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ -  A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL ANY
+ -  CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
+ -  EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
+ -  PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
+ -  PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
+ -  OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
+ -  NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ -  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ *====================================================================*/
+
+/*
+ * dither_reg.c
+ *
+ *    Test dithering from 8 bpp to 1 bpp and 2 bpp.
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config_auto.h>
+#endif  /* HAVE_CONFIG_H */
+
+#include "allheaders.h"
+
+int main(int    argc,
+         char **argv)
+{
+PIX          *pix, *pixs, *pix1, *pix2;
+L_REGPARAMS  *rp;
+
+    if (regTestSetup(argc, argv, &rp))
+        return 1;
+
+    pix = pixRead("test8.jpg");
+    pixs = pixGammaTRC(NULL, pix, 1.3, 0, 255);  /* gamma of 1.3, for fun */
+
+        /* Dither to 1 bpp */
+    pix1 = pixDitherToBinary(pixs);
+    regTestWritePixAndCheck(rp, pix1, IFF_PNG);  /* 0 */
+    pixDisplayWithTitle(pix1, 0, 0, NULL, rp->display);
+    pixDestroy(&pix1);
+
+         /* Dither to 2 bpp, with colormap */
+    pix1 = pixDitherTo2bpp(pixs, 1);
+    regTestWritePixAndCheck(rp, pix1, IFF_PNG);  /* 1 */
+    pixDisplayWithTitle(pix1, 400, 0, NULL, rp->display);
+
+         /* Dither to 2 bpp, without colormap */
+    pix2 = pixDitherTo2bpp(pixs, 0);
+    regTestWritePixAndCheck(rp, pix2, IFF_PNG);  /* 2 */
+    pixDisplayWithTitle(pix2, 800, 0, NULL, rp->display);
+    regTestComparePix(rp, pix1, pix2);   /* 3 */
+    pixDestroy(&pix1);
+    pixDestroy(&pix2);
+
+        /* Dither 2x upscale to 1 bpp */
+    pix1 = pixScaleGray2xLIDither(pixs);
+    regTestWritePixAndCheck(rp, pix1, IFF_PNG);  /* 4 */
+    pixDisplayWithTitle(pix1, 0, 400, NULL, rp->display);
+    pixDestroy(&pix1);
+
+        /* Dither 4x upscale to 1 bpp */
+    pix1 = pixScaleGray4xLIDither(pixs);
+    regTestWritePixAndCheck(rp, pix1, IFF_PNG);  /* 5 */
+    pixDisplayWithTitle(pix1, 700, 400, NULL, rp->display);
+    pixDestroy(&pix1);
+
+    pixDestroy(&pix);
+    pixDestroy(&pixs);
+    return regTestCleanup(rp);
+}
+