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[/] [mb-jpeg/] [tags/] [STEP2_2b/] [encoder/] [zzq.c] - Blame information for rev 66

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1 33 quickwayne 
//---------------------------------------------------------------------------
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#include <stdio.h>
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#include "zzq.h"
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#pragma hdrstop
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//---------------------------------------------------------------------------
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#pragma argsused
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static unsigned char quantization_table[MATRIX_SIZE][MATRIX_SIZE] ={
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        {4, 3, 3, 4, 4, 5, 6, 6},
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        {3, 3, 4, 4, 5, 6, 6, 6},
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        {4, 4, 4, 4, 5, 6, 6, 6},
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        {4, 4, 4, 5, 6, 6, 6, 6},
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        {4, 4, 5, 6, 6, 7, 7, 6},
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        {4, 5, 6, 6, 6, 7, 7, 6},
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        {6, 6, 6, 6, 7, 7, 7, 7},
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        {6, 6, 6, 7, 7, 7, 7, 7}
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    };
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//static int __count3=0;
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void zzq(signed short pixelmatrix[MATRIX_SIZE][MATRIX_SIZE], signed char *bitstream, int compression, int encode)
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{
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    int i, x, y, jumped, deltax, deltay;
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    x = y = deltax = deltay = jumped = 0;
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  //  printf("\nZigZag order pixelmatrix:\n\n");
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    for(i=0;i<NUMBER_OF_PIXELS;i++)
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    {
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        if (encode == 0) {
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                pixelmatrix[y][x] = (bitstream[i]*quantization_table[y][x]);
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        } else {
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                if(pixelmatrix[y][x]>0)
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                        bitstream[i] = (pixelmatrix[y][x]>>quantization_table[y][x]);
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                else
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                        bitstream[i] = -((-pixelmatrix[y][x])>>quantization_table[y][x]);
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              //  printf("%i ",bitstream[i]);
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#if 0
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 #ifdef __MICROBLAZE
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       if (__count3<256*3) {
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        xil_printf("%x ", bitstream[i]);
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        __count3++;
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        if ((__count3&0x0f)==0) xil_printf("\r\n");
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        }
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#else
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       if (__count3<256*3) {
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        printf(" %x ", bitstream[i]);
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        __count3++;
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        if ((__count3&0x0f)==0) printf("\r\n");
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        }
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#endif
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#endif
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       }
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        if((y == 0) || (y == MATRIX_SIZE-1)) { //on top or bottom side of matrix
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                if(!jumped) { //first jump to element on the right
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                        x++;
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                        jumped = 1;
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                } else { //modify direction
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                        if(i<(NUMBER_OF_PIXELS>>1)) {
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                                deltax = -1;
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                                deltay = 1;
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                        } else {
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                                deltax = 1;
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                                deltay = -1;
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                        }
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                        x += deltax;
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                        y += deltay;
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                        jumped = 0;
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                }
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        } else if ((x == 0) || (x == MATRIX_SIZE-1)) { //on left or right side of matrix
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                if(!jumped) { //jump to element below
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                        y++;
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                        jumped = 1;
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                } else { //modify direction
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                        if(i<(NUMBER_OF_PIXELS>>1)) {
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                                deltax = 1;
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                                deltay = -1;
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                        } else {
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                                deltax = -1;
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                                deltay = 1;
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                        }
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                        x += deltax;
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                        y += deltay;
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                        jumped = 0;
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                }
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        }
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        else {//not on the edges of the matrix
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                x += deltax;
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                y += deltay;
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        }
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    }
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}
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//---------------------------------------------------------------------------
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