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1 /* compile with: gcc -lgd -lpng -lz -ljpeg -lm resize-gd.c */
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2
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3 #include <stdio.h>
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4 #include <stdlib.h> /* for atoi() */
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5 #include <string.h>
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6 #include "gd.h" /* Bring in the gd library functions */
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7
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8
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9 enum {
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10 Png,
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11 Jpg,
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12 };
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13
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14
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15 int main(int argc, char* argv[]) {
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16 int i;
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17 int w, h;
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18 int x, y;
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19 int type;
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20 gdImagePtr im_in;
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21 gdImagePtr im_out;
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22 FILE* in;
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23 FILE* out;
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24
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25 if (argc < 3) {
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26 puts("usage: resize-gd <width>x<height> <imagefiles>");
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27 exit(1);
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28 }
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29
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30 /* parse width and height */
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31 w = atoi(argv[1]);
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32 h = atoi(strstr(argv[1], "x") + 1);
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33 printf("w: %d h: %d\n", w, h);
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34
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35 /* process images */
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36 for (i = 2; i < argc; i++) {
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37 printf("processing file '%s'\n", argv[i]);
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38
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39 if (strcmp(&(argv[i][strlen(argv[i])-4]), ".png") == 0) {
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40 type = Png;
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41 } else if (strcmp(&(argv[i][strlen(argv[i])-4]), ".jpg") == 0) {
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42 type = Jpg;
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43 } else {
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44 fprintf(stderr, "unknown filetype\n");
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45 exit(2);
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46 }
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47
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48 /* Load a large png to shrink in the smaller one */
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49 in = fopen(argv[i], "rb");
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50 if (type == Png) {
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51 im_in = gdImageCreateFromPng(in);
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52 } else if (type == Jpg) {
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53 im_in = gdImageCreateFromJpeg(in);
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54 }
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55 fclose(in);
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56
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57 im_out = gdImageCreateTrueColor(w, h);
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58
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59 /* Now copy the large image */
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60 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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61
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62 /* write out */
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63 out = fopen(argv[i], "wb");
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64 if (type == Png) {
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65 gdImagePng(im_out, out);
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66 } else if (type == Jpg) {
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67 gdImageJpeg(im_out, out, -1);
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68 }
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69 fclose(out);
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70
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71 gdImageDestroy(im_in);
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72 gdImageDestroy(im_out);
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73 }
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74
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75 return 0;
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76 }
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