gdiplus: Test cases and parameter checks for GdipDrawCurve.

dlls/gdiplus/graphics.c

@@ -1459,7 +1459,13 @@ GpStatus WINGDIPAPI GdipDrawCurve2(GpGraphics *graphics, GpPen *pen,
     if(graphics->busy)
         return ObjectBusy;
 
+    if(count < 2)
+        return InvalidParameter;
+
     pt = GdipAlloc(len_pt * sizeof(GpPointF));
+    if(!pt)
+        return OutOfMemory;
+
     tension = tension * TENSION_CONST;
 
     calc_curve_bezier_endp(points[0].X, points[0].Y, points[1].X, points[1].Y,

dlls/gdiplus/tests/graphics.c

@@ -367,6 +367,67 @@ static void test_GdipDrawBezierI(void)
     ReleaseDC(0, hdc);
 }
 
+static void test_GdipDrawCurve(void)
+{
+    GpStatus status;
+    GpGraphics *graphics = NULL;
+    GpPen *pen = NULL;
+    HDC hdc = GetDC(0);
+    GpPointF points[3];
+
+    points[0].X = 0;
+    points[0].Y = 0;
+
+    points[1].X = 40;
+    points[1].Y = 20;
+
+    points[2].X = 10;
+    points[2].Y = 40;
+
+    /* make a graphics object and pen object */
+    ok(hdc != NULL, "Expected HDC to be initialized\n");
+
+    status = GdipCreateFromHDC(hdc, &graphics);
+    expect(Ok, status);
+    ok(graphics != NULL, "Expected graphics to be initialized\n");
+
+    status = GdipCreatePen1((ARGB)0xffff00ff, 10.0f, UnitPixel, &pen);
+    expect(Ok, status);
+    ok(pen != NULL, "Expected pen to be initialized\n");
+
+    /* InvalidParameter cases: null graphics, null pen */
+    status = GdipDrawCurve(NULL, NULL, points, 3);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawCurve(graphics, NULL, points, 3);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawCurve(NULL, pen, points, 3);
+    expect(InvalidParameter, status);
+
+    /* InvalidParameter cases: invalid count */
+    status = GdipDrawCurve(graphics, pen, points, -1);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawCurve(graphics, pen, points, 0);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawCurve(graphics, pen, points, 1);
+    expect(InvalidParameter, status);
+
+    /* Valid test cases */
+    status = GdipDrawCurve(graphics, pen, points, 2);
+    expect(Ok, status);
+
+    status = GdipDrawCurve(graphics, pen, points, 3);
+    expect(Ok, status);
+
+    GdipDeletePen(pen);
+    GdipDeleteGraphics(graphics);
+
+    ReleaseDC(0, hdc);
+}
+
 static void test_GdipDrawLineI(void)
 {
     GpStatus status;
@@ -1095,6 +1156,7 @@ START_TEST(graphics)
     test_GdipDrawBezierI();
     test_GdipDrawArc();
     test_GdipDrawArcI();
+    test_GdipDrawCurve();
     test_GdipDrawLineI();
     test_GdipDrawLinesI();
     test_GdipDrawString();