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meillo@1
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1 /*
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2 * compile with: gcc -lgd -lpng -lz -ljpeg -lm resize-gd.c
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3 * build-depends: libgd2-noxpm-dev | libgd2-dev
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4 * depends: libgd2-noxpm | libgd2-xpm
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5 *
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6 *
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7 *
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8 * http://www.libgd.org/ImageCreation
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9 * http://cpan.uwinnipeg.ca/htdocs/Image-Resize/Image/Resize.pm.html
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10 * http://netpbm.sourceforge.net/
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11 *
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12 */
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13
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14 #include <stdio.h>
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meillo@0
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15 #include <stdlib.h> /* for atoi() */
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16 #include <string.h>
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17 #include <ctype.h>
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meillo@0
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18 #include "gd.h" /* Bring in the gd library functions */
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19
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20
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21 enum {
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22 Png,
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23 Jpg,
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24 };
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25
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26
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27 int main(int argc, char* argv[]) {
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28 int i;
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29 int w, h;
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30 int width, height;
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31 int x, y;
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32 int type;
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33 gdImagePtr im_in;
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34 gdImagePtr im_out;
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35 FILE* in;
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36 FILE* out;
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37 char* sep;
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38
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39 if (argc < 3) {
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40 puts("usage: resize-gd <width>x<height> <imagefiles>\n\
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41 resize-gd <size> <imagefiles> (keeps aspect ratio)\n");
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42 exit(1);
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43 }
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44
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meillo@0
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45 /* parse width and height */
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46 sep = argv[1];
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47 while (isdigit(*sep)) {
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48 sep++;
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49 }
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50 if (*sep == 'x' && isdigit(*(sep+1))) {
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51 sep++;
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52 while (isdigit(*sep)) {
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53 sep++;
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54 }
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55 }
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56 if (*sep != '\0') {
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meillo@1
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57 fprintf(stderr, "Invalid form of size. Has to be <size> or <width>x<height>.\n");
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58 exit(3);
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59 }
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60
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61 width = atoi(argv[1]);
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62 sep = strstr(argv[1], "x");
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63 if (sep && sep[1] != '\0') {
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64 height = atoi(sep + 1);
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65 } else {
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66 height = -1; /* keep aspect ratio */
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67 }
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68
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69
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70 /* process images */
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71 for (i = 2; i < argc; i++) {
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72 printf("processing file '%s'\n", argv[i]);
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73
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74 if (strcmp(argv[i]+strlen(argv[i])-4, ".png") == 0) {
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75 type = Png;
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76 } else if (strcmp(argv[i]+strlen(argv[i])-4, ".jpg") == 0) {
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77 type = Jpg;
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78 } else {
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79 fprintf(stderr, "'%s' has unknown filetype. Filename must end with (lowercase) '.png' or '.jpg'.\n", argv[i]);
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80 continue;
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81 }
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82 /* load image */
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83 in = fopen(argv[i], "rb");
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84
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85 if (type == Png) {
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86 im_in = gdImageCreateFromPng(in);
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87 } else if (type == Jpg) {
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88 im_in = gdImageCreateFromJpeg(in);
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89 }
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90 /*
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91 if ((im_in = gdImageCreateFromPng(in)) != NULL) {
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92 type = Png;
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93 } else if ((im_in = gdImageCreateFromJpeg(in)) != NULL) {
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94 type = Jpg;
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95 } else {
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96 fprintf(stderr, "'%s' has unknown filetype. Filename must end with (lowercase) '.png' or '.jpg'.\n", argv[i]);
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97 continue;
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98 }
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99 */
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100
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101 fclose(in);
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102
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103 /* for keeping aspect ratio */
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104 if (height <= 0) {
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105 if (im_in->sx > im_in->sy) {
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106 w = width;
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107 h = width * (1.0 * im_in->sy / im_in->sx);
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108 } else {
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109 h = width;
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110 w = width * (1.0 * im_in->sx / im_in->sy);
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111 }
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112 } else {
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113 w = width;
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114 h = height;
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115 }
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116
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117 /* copy-resize the image */
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118 im_out = gdImageCreateTrueColor(w, h);
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119 gdImageCopyResampled(im_out, im_in, 0, 0, 0, 0, im_out->sx, im_out->sy, im_in->sx, im_in->sy);
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120
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121 /* write image */
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122 out = fopen(argv[i], "wb");
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123 if (type == Png) {
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124 gdImagePng(im_out, out);
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125 } else if (type == Jpg) {
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126 gdImageJpeg(im_out, out, -1);
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127 }
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128 fclose(out);
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129
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130 gdImageDestroy(im_in);
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131 gdImageDestroy(im_out);
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132 }
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133
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134 return 0;
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135 }
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