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/**
* Test that gdImageGrayScale() produces pure gray-scale images
*
* We are reading a PNG image with transparency, apply gdImageGrayScale() and
* test that each pixel has equal red, blue and green components. To avoid
* flooding the test log, we bail out after the first non gray-scale pixel.
*
* We also make sure that the image is a truecolor image, since otherwise it is
* not guaranteed that all pixels are actually gray-scale.
*
* See also <https://github.com/libgd/libgd/issues/386>.
*/
#include "gd.h"
#include "gdtest.h"
int main()
{
gdImagePtr im;
FILE *fp;
int res;
int i, j;
fp = gdTestFileOpen2("gdimagegrayscale", "bug00386.png");
gdTestAssert(fp != NULL);
im = gdImageCreateFromPng(fp);
gdTestAssert(im != NULL);
fclose(fp);
res = gdImageTrueColor(im);
gdTestAssert(res != 0);
res = gdImageGrayScale(im);
gdTestAssert(res != 0);
for (i = 0; i < gdImageSX(im); i++) {
for (j = 0; j < gdImageSY(im); j++) {
int color = gdImageGetTrueColorPixel(im, i, j);
int red = gdImageRed(im, color);
int green = gdImageGreen(im, color);
int blue = gdImageBlue(im, color);
if (!gdTestAssert(red == green && green == blue)) {
return gdNumFailures();
}
}
}
gdImageDestroy(im);
return gdNumFailures();
}
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