Mercurial > resize-gd

annotate resize-gd.c @ 5:8e2804fe30bc

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skipps now too small images; added --version and --help
author meillo@marmaro.de
date Sat, 14 Jun 2008 12:18:06 +0200
parents 35a50e57b6f5
children c0045d8d3ce2
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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 #define PROGRAM "resize-gd"
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21 #define VERSION "0.1"
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22
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23 enum {
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24 Png,
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25 Jpg
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26 };
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27
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28 struct size {
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29 int w;
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30 int h;
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31 };
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32
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33
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34 void
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35 version() {
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36 printf("%s version: %s\n", PROGRAM, VERSION);
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37 }
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38
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39
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40 void
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41 usage() {
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42 printf("\
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43 usage: %s <size> <imagefiles> [...]\n\
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44 (keeps aspect ratio, does not enlarge images)\n\
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45 %s <width>x<height> <imagefiles> [...]\n\
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46 (resizes to that size, enlarges if needed)\n\
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47 ", PROGRAM, PROGRAM);
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48 }
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49
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50
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51 struct size
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52 calcsize(struct size opt, struct size img, int enlarge) {
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53 struct size result;
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54
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55 if (opt.h <= 0) {
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56 /* keep aspect ratio */
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57 if (!enlarge && opt.w > img.w && opt.w > img.h) {
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58 opt.w = (img.w > img.h) ? img.w : img.h;
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59 }
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60 if (img.w > img.h) {
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61 result.w = opt.w;
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62 result.h = opt.w * (1.0 * img.h / img.w);
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63 } else {
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64 result.h = opt.w;
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65 result.w = opt.w * (1.0 * img.w / img.h);
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66 }
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67 } else {
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68 result = opt;
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69 }
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70 return result;
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71 }
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72
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73
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74 int
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75 validsize(char* sp) {
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76 while (isdigit(*sp)) {
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77 sp++;
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78 }
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79 if (*sp == 'x' && isdigit(*(sp+1))) {
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80 sp++;
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81 while (isdigit(*sp)) {
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82 sp++;
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83 }
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84 }
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85 if (*sp != '\0') {
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86 return 0;
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87 }
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88 return 1;
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89 }
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90
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91
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92 int
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93 main(int argc, char* argv[]) {
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94 int i;
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95 int type;
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96 gdImagePtr im_in;
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97 gdImagePtr im_out;
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98 FILE* in;
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99 FILE* out;
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100 char* c;
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101 struct size sizeopt, sizeimg, sizedest;
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102
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103 if (argc == 2 && strcmp(argv[1], "--version") == 0) {
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104 version();
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105 exit(0);
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106 }
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107 if (argc == 2 && strcmp(argv[1], "--help") == 0) {
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108 version();
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109 usage();
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110 exit(0);
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111 }
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112 if (argc < 3) {
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113 usage();
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114 exit(1);
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115 }
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116
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117 if (!validsize(argv[1])) {
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118 fprintf(stderr, "Invalid form of size. Has to be <size> or <width>x<height>.\n");
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119 usage();
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120 exit(2);
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121 }
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122
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123 /* parse width and height */
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124 sizeopt.w = atoi(argv[1]);
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125 c = strstr(argv[1], "x");
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126 if (c && c[1] != '\0') {
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127 sizeopt.h = atoi(c + 1);
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128 } else {
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129 sizeopt.h = -1; /* keep aspect ratio */
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130 }
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131
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132
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133 /* process images */
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134 for (i = 2; i < argc; i++) {
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135 printf("processing file '%s'\n", argv[i]);
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136
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137 if (strcmp(argv[i]+strlen(argv[i])-4, ".png") == 0) {
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138 type = Png;
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139 } else if (strcmp(argv[i]+strlen(argv[i])-4, ".jpg") == 0) {
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140 type = Jpg;
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141 } else {
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142 fprintf(stderr, "'%s' has unknown filetype. Filename must end with (lowercase) '.png' or '.jpg'.\n", argv[i]);
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143 continue;
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144 }
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145 /* load image */
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146 in = fopen(argv[i], "rb");
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147
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148 if (type == Png) {
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149 im_in = gdImageCreateFromPng(in);
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150 } else if (type == Jpg) {
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151 im_in = gdImageCreateFromJpeg(in);
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152 }
1
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153 /*
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154 if ((im_in = gdImageCreateFromPng(in)) != NULL) {
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155 type = Png;
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156 } else if ((im_in = gdImageCreateFromJpeg(in)) != NULL) {
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157 type = Jpg;
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158 } else {
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159 fprintf(stderr, "'%s' has unknown filetype. Filename must end with (lowercase) '.png' or '.jpg'.\n", argv[i]);
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160 continue;
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161 }
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162 */
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163
0
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164 fclose(in);
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165
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166 /* calculate target size */
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167 sizeimg.w = im_in->sx;
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168 sizeimg.h = im_in->sy;
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169 sizedest = calcsize(sizeopt, sizeimg, 0);
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170
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171 /* skip images that dont need to be resized */
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172 if (sizedest.w == sizeimg.w && sizedest.h == sizeimg.h) {
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173 gdImageDestroy(im_in);
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174 continue;
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175 }
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176
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177 /* copy-resize the image */
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178 im_out = gdImageCreateTrueColor(sizedest.w, sizedest.h);
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179 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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180
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181 /* write image */
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182 out = fopen(argv[i], "wb");
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183 if (type == Png) {
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184 gdImagePng(im_out, out);
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185 } else if (type == Jpg) {
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186 gdImageJpeg(im_out, out, -1);
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187 }
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188 fclose(out);
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189
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190 gdImageDestroy(im_in);
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191 gdImageDestroy(im_out);
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192 }
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193
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194 return 0;
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195 }