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-rw-r--r--Build/source/libs/gd/libgd-src/tests/gdimagegrayscale/bug00386.c51
1 files changed, 51 insertions, 0 deletions
diff --git a/Build/source/libs/gd/libgd-src/tests/gdimagegrayscale/bug00386.c b/Build/source/libs/gd/libgd-src/tests/gdimagegrayscale/bug00386.c
new file mode 100644
index 00000000000..5b6d048130a
--- /dev/null
+++ b/Build/source/libs/gd/libgd-src/tests/gdimagegrayscale/bug00386.c
@@ -0,0 +1,51 @@
+/**
+ * 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();
+ }
+ }
+ }
+
+ return gdNumFailures();
+}