writepixels needs to bump genID

tests/WritePixelsTest.cpp

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapDevice.h"
 #include "SkCanvas.h"
 #include "SkColorPriv.h"
 #include "SkMathPriv.h"
 #include "SkRegion.h"
+#include "SkSurface.h"
 #include "Test.h"
 #include "sk_tool_utils.h"
 
 #if SK_SUPPORT_GPU
 #include "GrContextFactory.h"
 #include "SkGpuDevice.h"
 #else
 class GrContext;
 class GrContextFactory;
 #endif
@@ skipping 321 matching lines @@
     }
     SkAutoLockPixels alp(*bm);
     for (int y = 0; y < h; ++y) {
         for (int x = 0; x < w; ++x) {
             *bm->getAddr32(x, y) = getBitmapColor(x, y, w, ct, at);
         }
     }
     return true;
 }
 
+static void call_writepixels(SkCanvas* canvas) {
+    const SkImageInfo info = SkImageInfo::MakeN32Premul(1, 1);
+    SkPMColor pixel = 0;
+    canvas->writePixels(info, &pixel, sizeof(SkPMColor), 0, 0);
+}
+
+static void test_surface_genid(skiatest::Reporter* reporter) {
+    const SkImageInfo info = SkImageInfo::MakeN32Premul(100, 100);
+    SkAutoTUnref<SkSurface> surface(SkSurface::NewRaster(info));
+    uint32_t genID1 = surface->generationID();
+    call_writepixels(surface->getCanvas());
+    uint32_t genID2 = surface->generationID();
+    REPORTER_ASSERT(reporter, genID1 != genID2);
+}
+
 DEF_GPUTEST(WritePixels, reporter, factory) {
+    test_surface_genid(reporter);
+
     SkCanvas canvas;
 
     const SkIRect testRects[] = {
         // entire thing
         DEV_RECT,
         // larger on all sides
         SkIRect::MakeLTRB(-10, -10, DEV_W + 10, DEV_H + 10),
         // fully contained
         SkIRect::MakeLTRB(DEV_W / 4, DEV_H / 4, 3 * DEV_W / 4, 3 * DEV_H / 4),
         // outside top left
@@ skipping 97 matching lines @@
                         SkIRect writeRect = SkIRect::MakeXYWH(rect.fLeft, rect.fTop,
                                                               bmp.width(), bmp.height());
                         bool intersects = SkIRect::Intersects(canvasRect, writeRect) ;
                         REPORTER_ASSERT(reporter, intersects == (idBefore != idAfter));
                     }
                 }
             }
         }
     }
 }