Mercurial > resize-gd

annotate resize-gd.c @ 2:8e71b54b6e1e

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made separate functions for calcsize and usage; pictures are not enlarged by default
author meillo@marmaro.de
date Sat, 14 Jun 2008 10:15:07 +0200
parents 7a8f72b27dc3
children 35a50e57b6f5
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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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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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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 struct size {
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27 int w;
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28 int h;
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29 };
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30
2
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31
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32 void
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33 usage() {
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34 puts("\
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35 usage: resize-gd <size> <imagefiles> [...]\n\
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36 (keeps aspect ratio, does not enlarge images)\n\
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37 resize-gd <width>x<height> <imagefiles> [...]\n\
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38 (resizes to that size, enlarges if needed)\n\
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39 ");
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40 }
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41
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42
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43 struct size
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44 calcsize(struct size opt, struct size img, int enlarge) {
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45 struct size result;
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46
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47 if (opt.h <= 0) {
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48 /* keep aspect ratio */
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49 if (!enlarge && opt.w > img.w && opt.w > img.h) {
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50 opt.w = (img.w > img.h) ? img.w : img.h;
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51 }
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52 if (img.w > img.h) {
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53 result.w = opt.w;
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54 result.h = opt.w * (1.0 * img.h / img.w);
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55 } else {
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56 result.h = opt.w;
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57 result.w = opt.w * (1.0 * img.w / img.h);
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58 }
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59 } else {
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60 result = opt;
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61 }
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62 return result;
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63 }
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64
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65
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66 int
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67 validsize(char* sp) {
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68 while (isdigit(*sp)) {
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69 sp++;
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70 }
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71 if (*sp == 'x' && isdigit(*(sp+1))) {
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72 sp++;
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73 while (isdigit(*sp)) {
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74 sp++;
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75 }
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76 }
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77 if (*sp != '\0') {
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78 return 0;
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79 }
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80 return 1;
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81 }
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82
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83
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84 int
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85 main(int argc, char* argv[]) {
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86 int i;
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87 int w, h;
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88 int width, height;
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89 int x, y;
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90 int type;
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91 gdImagePtr im_in;
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92 gdImagePtr im_out;
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93 FILE* in;
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94 FILE* out;
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95 char* c;
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96 struct size sizeopt, sizeimg, sizedest;
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97
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98 if (argc < 3) {
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99 usage();
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100 exit(1);
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101 }
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102
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103 if (!validsize(argv[1])) {
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104 fprintf(stderr, "Invalid form of size. Has to be <size> or <width>x<height>.\n");
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105 usage();
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106 exit(3);
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107 }
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108
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109 /* parse width and height */
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110 sizeopt.w = atoi(argv[1]);
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111 c = strstr(argv[1], "x");
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112 if (c && c[1] != '\0') {
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113 sizeopt.h = atoi(c + 1);
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114 } else {
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115 sizeopt.h = -1; /* keep aspect ratio */
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116 }
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117
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118
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119 /* process images */
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120 for (i = 2; i < argc; i++) {
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121 printf("processing file '%s'\n", argv[i]);
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122
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123 if (strcmp(argv[i]+strlen(argv[i])-4, ".png") == 0) {
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124 type = Png;
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125 } else if (strcmp(argv[i]+strlen(argv[i])-4, ".jpg") == 0) {
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126 type = Jpg;
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127 } else {
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128 fprintf(stderr, "'%s' has unknown filetype. Filename must end with (lowercase) '.png' or '.jpg'.\n", argv[i]);
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129 continue;
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130 }
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131 /* load image */
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132 in = fopen(argv[i], "rb");
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133
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134 if (type == Png) {
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135 im_in = gdImageCreateFromPng(in);
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136 } else if (type == Jpg) {
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137 im_in = gdImageCreateFromJpeg(in);
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138 }
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139 /*
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140 if ((im_in = gdImageCreateFromPng(in)) != NULL) {
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141 type = Png;
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142 } else if ((im_in = gdImageCreateFromJpeg(in)) != NULL) {
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143 type = Jpg;
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144 } else {
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145 fprintf(stderr, "'%s' has unknown filetype. Filename must end with (lowercase) '.png' or '.jpg'.\n", argv[i]);
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146 continue;
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147 }
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148 */
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149
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150 fclose(in);
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151
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152 /* calculate target size */
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153 sizeimg.w = im_in->sx;
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154 sizeimg.h = im_in->sy;
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155 sizedest = calcsize(sizeopt, sizeimg, 0);
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156
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157 /* copy-resize the image */
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158 im_out = gdImageCreateTrueColor(sizedest.w, sizedest.h);
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159 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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160
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161 /* write image */
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162 out = fopen(argv[i], "wb");
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163 if (type == Png) {
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164 gdImagePng(im_out, out);
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165 } else if (type == Jpg) {
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166 gdImageJpeg(im_out, out, -1);
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167 }
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168 fclose(out);
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169
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170 gdImageDestroy(im_in);
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171 gdImageDestroy(im_out);
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172 }
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173
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174 return 0;
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175 }