- #58, Add new dithering alogirthm based on nthony Dekker's neuquant

  algorithm using http://pngnq.sourceforge.net/ with alpha support

1 files changed, 19 insertions, 0 deletions

diff --git a/src/gd_nnquant.h b/src/gd_nnquant.h
new file mode 100644
index 0000000..d19d7cf
--- /dev/null
+++ b/src/gd_nnquant.h
@@ -0,0 +1,19 @@
+
+/* maximum number of colours that can be used.
+  actual number is now passed to initcolors */
+#define MAXNETSIZE	256    
+
+/* For 256 colours, fixed arrays need 8kb, plus space for the image
+   ---------------------------------------------------------------- */
+
+
+/* four primes near 500 - assume no image has a length so large */
+/* that it is divisible by all four primes */
+#define prime1		499
+#define prime2		491
+#define prime3		487
+#define prime4		503
+
+#define minpicturebytes	(4*prime4)		/* minimum size for input image */
+
+