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Diffstat (limited to 'plugins/AdvaImg/src/FreeImageToolkit/Resize.h')
| -rw-r--r-- | plugins/AdvaImg/src/FreeImageToolkit/Resize.h | 145 |
1 files changed, 145 insertions, 0 deletions
diff --git a/plugins/AdvaImg/src/FreeImageToolkit/Resize.h b/plugins/AdvaImg/src/FreeImageToolkit/Resize.h new file mode 100644 index 0000000000..0d5d0b451a --- /dev/null +++ b/plugins/AdvaImg/src/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 + unsigned Left, Right; +} Contribution; + +private: + /// Row (or column) of contribution weights + Contribution *m_WeightTable; + /// Filter window size (of affecting source pixels) + unsigned m_WindowSize; + /// Length of line (no. of rows / cols) + unsigned m_LineLength; + +public: + /** + Constructor<br> + Allocate and compute the weights table + @param pFilter Filter used for upsampling or downsampling + @param uDstSize Length (in pixels) of the destination line buffer + @param uSrcSize Length (in pixels) of the source line buffer + */ + CWeightsTable(CGenericFilter *pFilter, unsigned uDstSize, unsigned 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(unsigned dst_pos, unsigned 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 + */ + unsigned getLeftBoundary(unsigned 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 + */ + unsigned getRightBoundary(unsigned 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_ |