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1 #ifndef DCT_H
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2 #define DCT_H
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3
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4 #include "wm.h"
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5 #include "coeff.h"
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6 #include "pgm.h"
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7
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8 extern int N;
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9 extern int M;
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10
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11 void init_dct_NxM(int width, int height);
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12 void fdct_NxM(gray **pixels, double **dcts);
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13 void idct_NxM(double **dcts, gray **pixels);
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14
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15 void init_dct_NxN(int width, int height);
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16 void fdct_NxN(gray **pixels, double **dcts);
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17 void idct_NxN(double **dcts, gray **pixels);
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18 void fdct_inplace_NxN(double **coeffs);
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19 void idct_inplace_NxN(double **coeffs);
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20
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21 /*
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22 * 'NJPEG' defines the JPEG's DCT block size (8x8)
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23 */
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24 #define NJPEG 8
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25
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26 void init_quantum_8x8(int quality);
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27 void init_quantum_JPEG_lumin(int quality);
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28 void init_quantum_JPEG_chromin(int quality);
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29 void quantize_8x8(double **transform);
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30 void dequantize_8x8(double **transform);
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31 void init_dct_8x8();
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32 void fdct_8x8(gray **input, double **output);
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33 void fdct_block_8x8(gray **input, int col, int row, double **output);
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34 void idct_8x8(double **input, gray **output);
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35 void idct_block_8x8(double **input, gray **output, int col, int row);
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36 int is_middle_frequency_coeff_8x8(int coeff);
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37
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38 #endif
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