gdiplus: Add test for GdipDrawDriverString.
diff --git a/dlls/gdiplus/tests/graphics.c b/dlls/gdiplus/tests/graphics.c
index bd14ab6..d42b37a 100644
--- a/dlls/gdiplus/tests/graphics.c
+++ b/dlls/gdiplus/tests/graphics.c
@@ -1954,6 +1954,8 @@
     LOGFONTA logfont;
     HDC hdc = GetDC( hwnd );
     static const WCHAR string[] = {'T','e','s','t',0};
+    static const PointF positions[4] = {{0,0}, {1,1}, {2,2}, {3,3}};
+    GpMatrix *matrix;
 
     memset(&logfont,0,sizeof(logfont));
     strcpy(logfont.lfFaceName,"Arial");
@@ -1985,6 +1987,36 @@
     status = GdipDrawString(graphics, string, 4, fnt, &rect, format, brush);
     expect(Ok, status);
 
+    status = GdipCreateMatrix(&matrix);
+    expect(Ok, status);
+
+todo_wine {
+    status = GdipDrawDriverString(NULL, string, 4, fnt, brush, positions, DriverStringOptionsCmapLookup, matrix);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawDriverString(graphics, NULL, 4, fnt, brush, positions, DriverStringOptionsCmapLookup, matrix);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawDriverString(graphics, string, 4, NULL, brush, positions, DriverStringOptionsCmapLookup, matrix);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawDriverString(graphics, string, 4, fnt, NULL, positions, DriverStringOptionsCmapLookup, matrix);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawDriverString(graphics, string, 4, fnt, brush, NULL, DriverStringOptionsCmapLookup, matrix);
+    expect(InvalidParameter, status);
+
+    status = GdipDrawDriverString(graphics, string, 4, fnt, brush, positions, DriverStringOptionsCmapLookup|0x10, matrix);
+    expect(Ok, status);
+
+    status = GdipDrawDriverString(graphics, string, 4, fnt, brush, positions, DriverStringOptionsCmapLookup, NULL);
+    expect(Ok, status);
+
+    status = GdipDrawDriverString(graphics, string, 4, fnt, brush, positions, DriverStringOptionsCmapLookup, matrix);
+    expect(Ok, status);
+}
+
+    GdipDeleteMatrix(matrix);
     GdipDeleteGraphics(graphics);
     GdipDeleteBrush(brush);
     GdipDeleteFont(fnt);
diff --git a/include/gdiplusenums.h b/include/gdiplusenums.h
index dc03b29..69c8154 100644
--- a/include/gdiplusenums.h
+++ b/include/gdiplusenums.h
@@ -42,6 +42,14 @@
    BrushTypeLinearGradient   = 4
 };
 
+enum DriverStringOptions
+{
+   DriverStringOptionsCmapLookup      = 1,
+   DriverStringOptionsVertical        = 2,
+   DriverStringOptionsRealizedAdvance = 4,
+   DriverStringOptionsLimitSubpixel   = 4
+};
+
 enum FillMode
 {
     FillModeAlternate   = 0,
@@ -707,6 +715,7 @@
 
 typedef enum Unit Unit;
 typedef enum BrushType BrushType;
+typedef enum DriverStringOptions DriverStringOptions;
 typedef enum FillMode FillMode;
 typedef enum LineCap LineCap;
 typedef enum PathPointType PathPointType;