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1 #include "wm.h"
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2 #include "gray.h"
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3
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4 gray **alloc_grays_8x8() {
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5 return alloc_grays(8, 8);
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6 }
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7
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8 gray **alloc_grays(int cols, int rows) {
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9 gray **p;
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10 int i;
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11
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12 p = (gray **)malloc(rows * sizeof(gray *));
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13 if (!p) {
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14 #ifdef DEBUG
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15 fprintf(stderr, "alloc_grays(): malloc() failed\n");
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16 exit(1);
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17 #else
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18 return NULL;
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19 #endif
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20 }
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21
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22 p[0] = (gray *)malloc(rows * cols * sizeof(gray));
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23 if (!p[0]) {
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24 #ifdef DEBUG
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25 fprintf(stderr, "alloc_grays(): malloc() failed\n");
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26 exit(1);
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27 #else
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28 free(p);
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29 return NULL;
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30 #endif
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31 }
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32
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33 for (i = 1; i < rows; i++) {
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34 p[i] = &(p[0][i * cols]);
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35 }
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36
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37 return p;
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38 }
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39
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40 void free_grays(gray **grays) {
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41 free(grays[0]);
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42 free(grays);
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43 }
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44
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45 void copy_grays_to_block(gray ** block_grays, gray ** image_grays, int c, int r, int w, int h) {
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46 int i, j;
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47
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48 #ifdef DEBUG
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49 if (!image_grays) {
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50 fprintf(stderr, "copy_grays_to_block(): NULL image pixels\n");
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51 }
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52 if (!block_grays) {
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53 fprintf(stderr, "copy_grays_to_block(): NULL block pixels\n");
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54 }
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55 if (w <= 0 || h <= 0 || c < 0 || r < 0) {
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56 fprintf(stderr, "copy_grays_to_block(): block dimension out of range\n");
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57 }
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58 #endif
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59
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60 for (i = 0; i < w; i++) {
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61 for (j = 0; j < h; j++)
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62 block_grays[j][i] = image_grays[r + j][c + i];
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63 }
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64 }
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65
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66 void copy_grays_from_block(gray ** image_grays, gray ** block_grays, int
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67 c, int r, int w, int h) {
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68 int i, j;
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69
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70 #ifdef DEBUG
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71 if (!image_grays) {
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72 fprintf(stderr, "copy_grays_from_block(): NULL image pixels\n");
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73 }
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74 if (!block_grays) {
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75 fprintf(stderr, "copy_grays_from_block(): NULL block pixels\n");
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76 }
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77 if (w <= 0 || h <= 0 || c < 0 || r < 0) {
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78 fprintf(stderr, "copy_grays_from_block(): block dimension out of range\n");
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79 }
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80 #endif
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81
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82 for (i = 0; i < w; i++) {
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83 for (j = 0; j < h; j++)
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84 image_grays[r + j][c + i] = block_grays[j][i];
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85 }
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86 }
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87
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88 void print_grays(gray **grays, int c, int r, int w, int h) {
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89 int i, j;
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90 gray *p;
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91
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92 #ifdef DEBUG
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93 if (!grays) {
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94 fprintf(stderr, "print_grays(): NULL pixels\n");
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95 }
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96 if (w <= 0 || h <= 0 || c < 0 || r < 0) {
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97 fprintf(stderr, "print_grays(): block dimension out of range\n");
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98 }
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99 #endif
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100
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101 for (j = r; j < r + h; j++) {
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102 p = &grays[j][c];
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103 for (i = 0; i < w; i++)
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104 fprintf(stderr, "%3d ", *(p++));
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105 fprintf(stderr, "\n");
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106 }
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107 }
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108
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109 void print_grays_8x8(gray **grays) {
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110 int i, j;
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111
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112 for (i = 0; i < 8; i++) {
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113 for (j = 0; j < 8; j++)
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114 fprintf(stderr, "%3d ", grays[i][j]);
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115 fprintf(stderr, "\n");
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116 }
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117 }
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