add testcase for gdImageCopyMerge

tests/CMakeLists.txt

@@ -35,6 +35,7 @@ if (BUILD_TEST)
 		gdimagecontrast
 		gdimageconvolution
 		gdimagecopy
+		gdimagecopymerge
 		gdimagecopyresampled
 		gdimagecopyrotated
 		gdimagecreate

tests/Makefile.am

@@ -31,6 +31,7 @@ include gdimagecolortransparent/Makemodule.am
 include gdimagecontrast/Makemodule.am
 include gdimageconvolution/Makemodule.am
 include gdimagecopy/Makemodule.am
+include gdimagecopymerge/Makemodule.am
 include gdimagecopyresampled/Makemodule.am
 include gdimagecopyrotated/Makemodule.am
 include gdimagecreate/Makemodule.am

tests/gdimagecopymerge/.gitignore

@@ -0,0 +1 @@
+/gdimagecopymerge

tests/gdimagecopymerge/CMakeLists.txt

@@ -0,0 +1,7 @@
+IF(PNG_FOUND)
+LIST(APPEND TESTS_FILES
+	gdimagecopymerge
+)
+ENDIF(PNG_FOUND)
+
+ADD_GD_TESTS()

tests/gdimagecopymerge/Makemodule.am

@@ -0,0 +1,8 @@
+if HAVE_LIBPNG
+libgd_test_programs += \
+	gdimagecopymerge/gdimagecopymerge
+endif
+
+EXTRA_DIST += \
+	gdimagecopymerge/CMakeLists.txt \
+	gdimagecopymerge/gdimagecopymerge_exp.png

tests/gdimagecopymerge/gdimagecopymerge.c

@@ -0,0 +1,38 @@
+/**
+ * Basic test for gdImageCopyMerge()
+ */
+#include "gd.h"
+#include "gdtest.h"
+
+int main()
+{
+	gdImagePtr dst = NULL;
+	gdImagePtr src = NULL;
+	int error = 0;
+
+	dst = gdImageCreate(100, 100);
+	src = gdImageCreate(50, 50);
+
+	if (gdTestAssert(!dst)) {
+		error = 1;
+		goto done;
+	}
+	if (gdTestAssert(!src)) {
+		error = 1;
+		goto done;
+	}
+
+	gdImageColorAllocate(src, 255, 255, 255);
+	gdImageColorAllocate(dst, 0, 0, 0);
+	gdImageCopyMerge(dst, src, 25, 25, 0, 0, 50, 50, 50);
+
+	if (!gdAssertImageEqualsToFile("gdimagecopymerge/gdimagecopymerge_exp.png", dst)) {
+		error = 1;
+	}
+
+done:
+	gdImageDestroy(dst);
+	gdImageDestroy(src);
+
+	return error;
+}