1 files changed, 145 insertions, 0 deletions
diff --git a/Source/FreeImageToolkit/Resize.h b/Source/FreeImageToolkit/Resize.h
new file mode 100644
index 0000000..2584efd
--- /dev/null
+++ b/Source/FreeImageToolkit/Resize.h
@@ -0,0 +1,145 @@
+// ==========================================================
+// Upsampling / downsampling classes
+//
+// Design and implementation by
+// - Hervé Drolon (drolon@infonie.fr)
+// - Detlev Vendt (detlev.vendt@brillit.de)
+//
+// This file is part of FreeImage 3
+//
+// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
+// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
+// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
+// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
+// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
+// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
+// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
+// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
+// THIS DISCLAIMER.
+//
+// Use at your own risk!
+// ==========================================================
+
+#ifndef _RESIZE_H_
+#define _RESIZE_H_
+
+#include "FreeImage.h"
+#include "Utilities.h"
+#include "Filters.h" 
+
+/**
+  Filter weights table.<br>
+  This class stores contribution information for an entire line (row or column).
+*/
+class CWeightsTable
+{
+/** 
+  Sampled filter weight table.<br>
+  Contribution information for a single pixel
+*/
+typedef struct {
+	/// Normalized weights of neighboring pixels
+	double *Weights;
+	/// Bounds of source pixels window
+	int Left, Right;   
+} Contribution;  
+
+private:
+	/// Row (or column) of contribution weights 
+	Contribution *m_WeightTable;
+	/// Filter window size (of affecting source pixels) 
+	DWORD m_WindowSize;
+	/// Length of line (no. of rows / cols) 
+	DWORD m_LineLength;
+
+public:
+	/** 
+	Constructor<br>
+	Allocate and compute the weights table
+	@param pFilter Filter used for upsampling or downsampling
+	@param uLineSize Length (in pixels) of the destination line buffer
+	@param uSrcSize Length (in pixels) of the source line buffer
+	*/
+	CWeightsTable(CGenericFilter *pFilter, DWORD uDstSize, DWORD uSrcSize);
+
+	/**
+	Destructor<br>
+	Destroy the weights table
+	*/
+	~CWeightsTable();
+
+	/** Retrieve a filter weight, given source and destination positions
+	@param dst_pos Pixel position in destination line buffer
+	@param src_pos Pixel position in source line buffer
+	@return Returns the filter weight
+	*/
+	double getWeight(int dst_pos, int src_pos) {
+		return m_WeightTable[dst_pos].Weights[src_pos];
+	}
+
+	/** Retrieve left boundary of source line buffer
+	@param dst_pos Pixel position in destination line buffer
+	@return Returns the left boundary of source line buffer
+	*/
+	int getLeftBoundary(int dst_pos) {
+		return m_WeightTable[dst_pos].Left;
+	}
+
+	/** Retrieve right boundary of source line buffer
+	@param dst_pos Pixel position in destination line buffer
+	@return Returns the right boundary of source line buffer
+	*/
+	int getRightBoundary(int dst_pos) {
+		return m_WeightTable[dst_pos].Right;
+	}
+};
+
+// ---------------------------------------------
+
+/**
+ CResizeEngine<br>
+ This class performs filtered zoom. It scales an image to the desired dimensions with 
+ any of the CGenericFilter derived filter class.<br>
+ It works with 8-, 24- and 32-bit buffers.<br><br>
+
+ <b>References</b> : <br>
+ [1] Paul Heckbert, C code to zoom raster images up or down, with nice filtering. 
+ UC Berkeley, August 1989. [online] http://www-2.cs.cmu.edu/afs/cs.cmu.edu/Web/People/ph/heckbert.html
+ [2] Eran Yariv, Two Pass Scaling using Filters. The Code Project, December 1999. 
+ [online] http://www.codeproject.com/bitmap/2_pass_scaling.asp
+
+*/
+class CResizeEngine
+{
+private:
+	/// Pointer to the FIR / IIR filter
+	CGenericFilter* m_pFilter;
+
+public:
+
+    /// Constructor
+	CResizeEngine(CGenericFilter* filter):m_pFilter(filter) {}
+
+    /// Destructor
+	virtual ~CResizeEngine() {}
+
+    /** Scale an image to the desired dimensions
+	@param src Pointer to the source image
+	@param dst_width Destination image width
+	@param dst_height Destination image height
+	@return Returns the scaled image if successful, returns NULL otherwise
+	*/
+	FIBITMAP* scale(FIBITMAP *src, unsigned dst_width, unsigned dst_height);
+
+private:
+
+    /// Performs horizontal image filtering
+	void horizontalFilter(FIBITMAP *src, unsigned src_width, unsigned src_height, FIBITMAP *dst, unsigned dst_width, unsigned dst_height);
+
+    /// Performs vertical image filtering
+    void verticalFilter(FIBITMAP *src, unsigned src_width, unsigned src_height, FIBITMAP *dst, unsigned dst_width, unsigned dst_height);
+};
+
+
+
+#endif //   _RESIZE_H_