add testcase for gdimagecreatefromgd2partptr

tests/gd2/.gitignore

@@ -3,6 +3,7 @@
 /bug00309
 /bug00354
 /bug00383
+/createimagefromgd2partptr
 /gd2_empty_file
 /gd2_im2im
 /gd2_null

tests/gd2/CMakeLists.txt

@@ -6,6 +6,7 @@ LIST(APPEND TESTS_FILES
 	bug00309
 	bug00354
 	bug00383
+	createimagefromgd2partptr
 	gd2_empty_file
 	php_bug_72339
 	gd2_null

tests/gd2/Makemodule.am

@@ -6,6 +6,7 @@ libgd_test_programs += \
 	gd2/bug00309 \
 	gd2/bug00354 \
 	gd2/bug00383 \
+	gd2/createimagefromgd2partptr \
 	gd2/gd2_empty_file \
 	gd2/php_bug_72339 \
 	gd2/gd2_null \

tests/gd2/createimagefromgd2partptr.c

@@ -0,0 +1,59 @@
+/**
+ * Base test for gdImageCreateFromGd2PartPtr()
+ */
+#include "gd.h"
+#include "gdtest.h"
+#include <stdio.h>
+
+int main()
+{
+	FILE *p;
+	gdImagePtr im, partim;
+	void *pg;
+	int size = 0;
+	int status = 0;
+	int actual_color = 0;
+	int expected_color = 0xffffff;
+
+	p = gdTestFileOpen2("gd2", "conv_test.gd2");
+	if (!p) {
+		gdTestErrorMsg("failed, cannot open gd2 file:conv_test.gd2");
+		return 1;
+	}
+
+	im = gdImageCreateFromGd2(p);
+	fclose(p);
+
+	if (!im) {
+		gdTestErrorMsg("failed, cannot create gd2 file.");
+		return 1;
+	}
+
+	pg = gdImageGd2Ptr(im, (GD2_CHUNKSIZE_MIN + GD2_CHUNKSIZE_MAX) / 2, GD2_FMT_COMPRESSED, &size);
+	if (!pg) {
+		status = 1;
+		goto done1;
+	}
+
+	if (size <= 0) {
+		status = 1;
+		goto done0;
+	}
+
+	partim =  gdImageCreateFromGd2PartPtr(size, pg, 3, 3, 3, 3);
+	if (!partim) {
+		status = 1;
+		goto done0;
+	}
+
+	actual_color = gdImageGetPixel(partim, 2, 2);
+	status = (expected_color == actual_color) ? 0 : 1;
+	gdImageDestroy(partim);
+
+done0:
+	gdFree(pg);
+done1:
+	gdImageDestroy(im);
+
+	return status;
+}