From d577d991b97ae2b5ee1af23641bcffc3f83af5b2 Mon Sep 17 00:00:00 2001
From: Pixel <pixel@nobis-crew.org>
Date: Wed, 4 Nov 2009 11:56:41 -0800
Subject: Initial import. Contains the im, cd and iup librairies, and a
 "working" Makefile for them under linux.

---
 im/src/process/im_quantize.cpp | 64 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 64 insertions(+)
 create mode 100755 im/src/process/im_quantize.cpp

(limited to 'im/src/process/im_quantize.cpp')

diff --git a/im/src/process/im_quantize.cpp b/im/src/process/im_quantize.cpp
new file mode 100755
index 0000000..de78cf4
--- /dev/null
+++ b/im/src/process/im_quantize.cpp
@@ -0,0 +1,64 @@
+/** \file
+ * \brief Additional Image Quantization Operations
+ *
+ * See Copyright Notice in im_lib.h
+ * $Id: im_quantize.cpp,v 1.2 2009/09/25 18:40:32 scuri Exp $
+ */
+
+
+#include <im.h>
+#include <im_util.h>
+#include <im_palette.h>
+#include <im_math.h>
+
+#include "im_process_pon.h"
+
+#include <stdlib.h>
+#include <memory.h>
+
+
+void imProcessQuantizeRGBUniform(const imImage* src_image, imImage* dst_image, int dither)
+{
+  imbyte *dst_map=(imbyte*)dst_image->data[0], 
+         *red_map=(imbyte*)src_image->data[0],
+         *green_map=(imbyte*)src_image->data[1],
+         *blue_map=(imbyte*)src_image->data[2];
+
+  imImageSetPalette(dst_image, imPaletteUniform(), 256);
+
+  for (int y = 0; y < src_image->height; y++)
+  {
+    for (int x = 0; x < src_image->width; x++)
+    {
+      if (dither)
+        *dst_map++ = (imbyte)imPaletteUniformIndexHalftoned(imColorEncode(*red_map++, *green_map++, *blue_map++), x, y);
+      else
+        *dst_map++ = (imbyte)imPaletteUniformIndex(imColorEncode(*red_map++, *green_map++, *blue_map++));
+    }
+  }
+}
+
+void imProcessQuantizeGrayUniform(const imImage* src_image, imImage* dst_image, int grays)
+{
+  int i, value;
+
+  imbyte *dst_map=(imbyte*)dst_image->data[0], 
+         *src_map=(imbyte*)src_image->data[0];
+
+  imbyte re_map[256];
+  memset(re_map, 0, 256);
+
+  float factor = (float)grays/256.0f;
+  float factor256 = 256.0f/(float)grays;
+
+  for (i = 0; i < 256; i++)
+  {             
+    value = imResample(i, factor);
+    value = imResample(value, factor256);
+    re_map[i] = (imbyte)IM_BYTECROP(value);
+  }
+
+  int total_count = src_image->count*src_image->depth;
+  for (i = 0; i < total_count; i++)
+    dst_map[i] = re_map[src_map[i]];
+}
-- 
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