Expand pixelref to return SkImageInfo and rowbytes

tests/PixelRefTest.cpp

 #include "Test.h"
 #include "TestClassDef.h"
 
 #include "SkPixelRef.h"
 #include "SkMallocPixelRef.h"
 
 namespace {
 
 class TestListener : public SkPixelRef::GenIDChangeListener {
 public:
     explicit TestListener(int* ptr) : fPtr(ptr) {}
     void onChange() SK_OVERRIDE { (*fPtr)++; }
 private:
     int* fPtr;
 };
 
 }  // namespace
 
 DEF_TEST(PixelRef_GenIDChange, r) {
-    SkMallocPixelRef pixelRef(NULL, 0, NULL);  // We don't really care about the pixels here.
+    SkImageInfo info = { 10, 10, kPMColor_SkColorType, kPremul_SkAlphaType };
+
+    SkAutoTUnref<SkPixelRef> pixelRef(SkMallocPixelRef::NewAllocate(info, 0, NULL));
 
     // Register a listener.
     int count = 0;
-    pixelRef.addGenIDChangeListener(SkNEW_ARGS(TestListener, (&count)));
+    pixelRef->addGenIDChangeListener(SkNEW_ARGS(TestListener, (&count)));
     REPORTER_ASSERT(r, 0 == count);
 
     // No one has looked at our pixelRef's generation ID, so invalidating it doesn't make sense.
     // (An SkPixelRef tree falls in the forest but there's nobody around to hear it.  Do we care?)
-    pixelRef.notifyPixelsChanged();
+    pixelRef->notifyPixelsChanged();
     REPORTER_ASSERT(r, 0 == count);
 
     // Force the generation ID to be calculated.
-    REPORTER_ASSERT(r, 0 != pixelRef.getGenerationID());
+    REPORTER_ASSERT(r, 0 != pixelRef->getGenerationID());
 
     // Our listener was dropped in the first call to notifyPixelsChanged().  This is a no-op.
-    pixelRef.notifyPixelsChanged();
+    pixelRef->notifyPixelsChanged();
     REPORTER_ASSERT(r, 0 == count);
 
     // Force the generation ID to be recalculated, then add a listener.
-    REPORTER_ASSERT(r, 0 != pixelRef.getGenerationID());
-    pixelRef.addGenIDChangeListener(SkNEW_ARGS(TestListener, (&count)));
-    pixelRef.notifyPixelsChanged();
+    REPORTER_ASSERT(r, 0 != pixelRef->getGenerationID());
+    pixelRef->addGenIDChangeListener(SkNEW_ARGS(TestListener, (&count)));
+    pixelRef->notifyPixelsChanged();
     REPORTER_ASSERT(r, 1 == count);
 
     // Quick check that NULL is safe.
-    REPORTER_ASSERT(r, 0 != pixelRef.getGenerationID());
-    pixelRef.addGenIDChangeListener(NULL);
-    pixelRef.notifyPixelsChanged();
+    REPORTER_ASSERT(r, 0 != pixelRef->getGenerationID());
+    pixelRef->addGenIDChangeListener(NULL);
+    pixelRef->notifyPixelsChanged();
 }