91 lines
1.8 KiB
C
91 lines
1.8 KiB
C
#include "gd.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <math.h>
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gdImagePtr loadImage(const char *name)
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{
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FILE *fp;
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gdImagePtr im;
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fp = fopen(name, "rb");
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if (!fp) {
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fprintf(stderr, "Can't open jpeg file\n");
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return NULL;
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}
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im = gdImageCreateFromJpeg(fp);
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fclose(fp);
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return im;
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}
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int savePngImage(gdImagePtr im, const char *name)
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{
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FILE *fp;
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fp = fopen(name, "wb");
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if (!fp) {
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fprintf(stderr, "Can't save png image fromtiff.png\n");
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return 0;
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}
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gdImagePng(im, fp);
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fclose(fp);
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return 1;
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}
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int main(int argc, char **arg)
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{
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gdImagePtr im, im2;
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int new_width, new_height;
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double angle, a2;
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if (argc < 3) {
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fprintf(stderr, "Usage: copyrotated [angle in degree] [filename.png]\n");
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return 1;
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}
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angle = strtod(arg[1], 0);
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im = loadImage(arg[2]);
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if (!im) {
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fprintf(stderr, "Can't load PNG file <%s>", arg[1]);
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return 1;
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}
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/*
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cos adj hyp (cos = adjacent / hypotenuse)
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sin op hyp (sin adjacent / hypotenuse)
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+ 10 pixels margin
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*/
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/* to radian */
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a2 = angle * .0174532925;
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new_width = fabs(ceil(cos(a2) * gdImageSX(im))) +
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fabs(sin(a2) * gdImageSY(im));
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new_height = fabs(ceil(cos(a2) * gdImageSY(im))) +
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fabs(sin(a2) * gdImageSX(im));
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im2 = gdImageCreateTrueColor(new_width, new_height);
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if (!im2) {
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fprintf(stderr, "Can't create a new image");
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gdImageDestroy(im);
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return 1;
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}
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gdImageAlphaBlending(im2, 0);
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gdImageFilledRectangle(im2, 0, 0, gdImageSX(im2), gdImageSY(im2), gdTrueColorAlpha(127,0,0,127));
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gdImageCopyRotated(im2, im, new_width/2, new_height/2, 0, 0, gdImageSX(im), gdImageSY(im), angle);
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gdImageSaveAlpha(im2, 1);
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if (!savePngImage(im2, "rotated.png")) {
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fprintf(stderr, "Can't save PNG file rotated.png");
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gdImageDestroy(im);
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gdImageDestroy(im2);
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return 1;
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}
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gdImageDestroy(im2);
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gdImageDestroy(im);
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return 0;
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}
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