1 /**
2 * Regression test for <https://github.com/libgd/libgd/issues/329>
3 *
4 * We're testing that for truecolor as well as palette images after
5 * GD_BILINEAR_FIXED scaling the corner pixels of the scaled image have the
6 * expected color.
7 */
8
9 #include <string.h>
10 #include "gd.h"
11 #include "gdtest.h"
12
test(const char * mode)13 static void test(const char *mode)
14 {
15 gdImagePtr src, dst;
16 int expected, actual;
17
18 if (strcmp(mode, "palette")) {
19 src = gdImageCreateTrueColor(100, 100);
20 expected = gdTrueColorAlpha(255, 255, 255, gdAlphaOpaque);
21 gdImageFilledRectangle(src, 0,0, 99,99, expected);
22 } else {
23 src = gdImageCreate(100, 100);
24 gdImageColorAllocate(src, 255, 255, 255);
25 expected = gdImageGetTrueColorPixel(src, 49, 49);
26 }
27
28 gdImageSetInterpolationMethod(src, GD_BILINEAR_FIXED);
29 dst = gdImageScale(src, 200, 200);
30
31 actual = gdImageGetPixel(dst, 0, 0);
32 gdTestAssertMsg(actual == expected, "%s: wrong color; expected %x, but got %x", mode, expected, actual);
33 actual = gdImageGetPixel(dst, 0, 199);
34 gdTestAssertMsg(actual == expected, "%s: wrong color; expected %x, but got %x", mode, expected, actual);
35 actual = gdImageGetPixel(dst, 199, 199);
36 gdTestAssertMsg(actual == expected, "%s: wrong color; expected %x, but got %x", mode, expected, actual);
37 actual = gdImageGetPixel(dst, 199, 0);
38 gdTestAssertMsg(actual == expected, "%s: wrong color; expected %x, but got %x", mode, expected, actual);
39
40 gdImageDestroy(src);
41 gdImageDestroy(dst);
42 }
43
main()44 int main()
45 {
46 test("palette");
47 test("truecolor");
48
49 return gdNumFailures();
50 }
51