add null-surface

Bug:crbug.com/737726
Change-Id: Iec9094d8d7232943e90fe2d9745fc83bcdf90954
Reviewed-on: https://skia-review.googlesource.com/21190
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Mike Reed <reed@google.com>

1 files changed, 12 insertions, 0 deletions

diff --git a/tests/SurfaceTest.cpp b/tests/SurfaceTest.cpp
index dc051a54b6..5249b3d562 100644
--- a/tests/SurfaceTest.cpp
+++ b/tests/SurfaceTest.cpp
@@ -948,3 +948,15 @@ DEF_GPUTEST_FOR_RENDERING_CONTEXTS(OverdrawSurface_Gpu, r, ctxInfo) {
     test_overdraw_surface(r, surface.get());
 }
 #endif
+
+DEF_TEST(Surface_null, r) {
+    REPORTER_ASSERT(r, SkSurface::MakeNull(0, 0) == nullptr);
+
+    const int w = 37;
+    const int h = 1000;
+    auto surf = SkSurface::MakeNull(w, h);
+    auto canvas = surf->getCanvas();
+
+    canvas->drawPaint(SkPaint());   // should not crash, but don't expect anything to draw
+    REPORTER_ASSERT(r, surf->makeImageSnapshot() == nullptr);
+}