Mercurial > resize-gd

annotate resize-gd.c @ 13:c4834b4f4b54

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added backslashes to dashes in manpage
author meillo@marmaro.de
date Sat, 14 Jun 2008 19:14:27 +0200
parents 6b8e8fcd6d4d
children 6f5c3a02e4d5
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1 /*
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2 * resize-gd - resizes images using the gd-library
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3 *
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4 * Copyright 2008 by markus schnalke <meillo@marmaro.de>
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5 *
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6 * build-depends: libgd2-noxpm-dev | libgd2-dev
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7 * depends: libgd2-noxpm | libgd2-xpm
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8 */
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9
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10 #include <stdio.h>
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11 #include <stdlib.h>
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12 #include <string.h>
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13 #include <ctype.h>
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14 #include "gd.h"
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15
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16 #define PROGRAM "resize-gd"
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17 #define VERSION "0.2"
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18
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19 enum {
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20 Png,
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21 Jpg
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22 };
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23
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24 struct size {
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25 int w;
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26 int h;
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27 };
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28
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29
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30 void
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31 version() {
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32 printf("%s version: %s\n", PROGRAM, VERSION);
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33 }
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34
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35
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36 void
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37 usage() {
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38 printf("\
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39 usage: %s <size> <imagefiles> [...]\n\
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40 (keeps aspect ratio, does not enlarge images)\n\
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41 %s <width>x<height> <imagefiles> [...]\n\
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42 (resizes to that size, enlarges if needed)\n\
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43 ", PROGRAM, PROGRAM);
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44 }
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45
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46
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47 struct size
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48 calcsize(struct size opt, struct size img, int enlarge) {
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49 struct size result;
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50
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51 if (opt.h <= 0) {
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52 /* keep aspect ratio */
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53 if (!enlarge && opt.w > img.w && opt.w > img.h) {
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54 opt.w = (img.w > img.h) ? img.w : img.h;
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55 }
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56 if (img.w > img.h) {
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57 result.w = opt.w;
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58 result.h = opt.w * (1.0 * img.h / img.w);
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59 } else {
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60 result.h = opt.w;
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61 result.w = opt.w * (1.0 * img.w / img.h);
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62 }
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63 } else {
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64 result = opt;
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65 }
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66 return result;
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67 }
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68
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69
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70 int
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71 validsize(char* sp) {
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72 while (isdigit(*sp)) {
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73 sp++;
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74 }
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75 if (*sp == 'x' && isdigit(*(sp+1))) {
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76 sp++;
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77 while (isdigit(*sp)) {
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78 sp++;
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79 }
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80 }
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81 if (*sp != '\0') {
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82 return 0;
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83 }
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84 return 1;
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85 }
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86
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87
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88 int
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89 main(int argc, char* argv[]) {
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90 int i;
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91 int type;
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92 gdImagePtr im_in;
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93 gdImagePtr im_out;
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94 FILE* in;
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95 FILE* out;
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96 char* c;
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97 struct size sizeopt, sizeimg, sizedest;
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98
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99 if (argc == 2 && strcmp(argv[1], "--version") == 0) {
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100 version();
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101 exit(0);
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102 }
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103 if (argc == 2 && strcmp(argv[1], "--help") == 0) {
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104 version();
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105 usage();
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106 exit(0);
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107 }
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108 if (argc < 3) {
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109 usage();
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110 exit(1);
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111 }
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112
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113 if (!validsize(argv[1])) {
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114 fprintf(stderr, "Invalid form of size. Has to be <size> or <width>x<height>.\n");
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115 usage();
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116 exit(2);
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117 }
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118
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119 /* parse width and height */
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120 sizeopt.w = atoi(argv[1]);
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121 c = strstr(argv[1], "x");
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122 if (c && c[1] != '\0') {
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123 sizeopt.h = atoi(c + 1);
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124 } else {
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125 sizeopt.h = -1; /* keep aspect ratio */
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126 }
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127
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128
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129 /* process images */
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130 for (i = 2; i < argc; i++) {
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131 /* printf("processing file '%s'\n", argv[i]); */
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132
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133 if (strcmp(argv[i]+strlen(argv[i])-4, ".png") == 0) {
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134 type = Png;
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135 } else if (strcmp(argv[i]+strlen(argv[i])-4, ".jpg") == 0) {
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136 type = Jpg;
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137 } else {
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138 fprintf(stderr, "'%s' has unknown filetype. Filename must end with (lowercase) '.png' or '.jpg'.\n", argv[i]);
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139 continue;
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140 }
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141
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142 /* load image */
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143 in = fopen(argv[i], "rb");
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144 if (in == NULL) {
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145 fprintf(stderr, "unable to open '%s' for reading\n", argv[i]);
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146 continue;
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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 }
10
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153 if (im_in == NULL) {
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154 fprintf(stderr, "unable to load image '%s'\n", argv[i]);
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155 continue;
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156 }
0
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157 fclose(in);
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158
2
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159 /* calculate target size */
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160 sizeimg.w = im_in->sx;
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161 sizeimg.h = im_in->sy;
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162 sizedest = calcsize(sizeopt, sizeimg, 0);
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163
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164 /* skip images that dont need to be resized */
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165 if (sizedest.w == sizeimg.w && sizedest.h == sizeimg.h) {
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166 gdImageDestroy(im_in);
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167 continue;
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168 }
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169
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170 /* copy-resize the image */
2
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171 im_out = gdImageCreateTrueColor(sizedest.w, sizedest.h);
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172 if (im_out == NULL) {
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173 fprintf(stderr, "unable to allocate memory for resized image\n");
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174 exit(3);
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175 }
0
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176 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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177
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178 /* write image */
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179 out = fopen(argv[i], "wb");
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180 if (out == NULL) {
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181 fprintf(stderr, "unable to open '%s' for writing\n", argv[i]);
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182 continue;
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183 }
0
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184 if (type == Png) {
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185 gdImagePng(im_out, out);
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186 } else if (type == Jpg) {
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187 gdImageJpeg(im_out, out, -1);
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188 }
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189 fclose(out);
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190
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191 gdImageDestroy(im_in);
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192 gdImageDestroy(im_out);
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193 }
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194
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195 return 0;
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196 }