Fix unref order in SkGpuDevice

GrContext should be unrefed after GrDrawContext.

TBR=bsalomon@google.com
BUG=skia:
GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1569833004

Review URL: https://codereview.chromium.org/1569833004

2 files changed, 11 insertions, 17 deletions

diff --git a/src/gpu/SkGpuDevice.cpp b/src/gpu/SkGpuDevice.cpp
index 89273be9a3..cd678af880 100644
--- a/src/gpu/SkGpuDevice.cpp
+++ b/src/gpu/SkGpuDevice.cpp
@@ -10,7 +10,6 @@
 #include "GrBlurUtils.h"
 #include "GrContext.h"
 #include "SkDraw.h"
-#include "GrDrawContext.h"
 #include "GrGpu.h"
 #include "GrGpuResourcePriv.h"
 #include "GrImageIDTextureAdjuster.h"
@@ -171,13 +170,11 @@ SkGpuDevice* SkGpuDevice::Create(GrContext* context, SkSurface::Budgeted budgete
 SkGpuDevice::SkGpuDevice(GrRenderTarget* rt, int width, int height,
                          const SkSurfaceProps* props, unsigned flags)
     : INHERITED(SkSurfacePropsCopyOrDefault(props))
-{
-    fContext = SkRef(rt->getContext());
+    , fContext(SkRef(rt->getContext()))
+    , fRenderTarget(SkRef(rt)) {
     fNeedClear = SkToBool(flags & kNeedClear_Flag);
     fOpaque = SkToBool(flags & kIsOpaque_Flag);
 
-    fRenderTarget = SkRef(rt);
-
     SkAlphaType at = fOpaque ? kOpaque_SkAlphaType : kPremul_SkAlphaType;
     SkImageInfo info = rt->surfacePriv().info(at).makeWH(width, height);
     SkPixelRef* pr = new SkGrPixelRef(info, rt);
@@ -226,11 +223,6 @@ GrRenderTarget* SkGpuDevice::CreateRenderTarget(GrContext* context, SkSurface::B
     return texture->asRenderTarget();
 }
 
-SkGpuDevice::~SkGpuDevice() {
-    fRenderTarget->unref();
-    fContext->unref();
-}
-
 ///////////////////////////////////////////////////////////////////////////////
 
 bool SkGpuDevice::onReadPixels(const SkImageInfo& dstInfo, void* dstPixels, size_t dstRowBytes,
@@ -346,8 +338,7 @@ void SkGpuDevice::replaceRenderTarget(bool shouldRetainContent) {
 
     SkASSERT(fRenderTarget != newRT);
 
-    fRenderTarget->unref();
-    fRenderTarget = newRT.detach();
+    fRenderTarget.reset(newRT.detach());
 
 #ifdef SK_DEBUG
     SkImageInfo info = fRenderTarget->surfacePriv().info(fOpaque ? kOpaque_SkAlphaType :
diff --git a/src/gpu/SkGpuDevice.h b/src/gpu/SkGpuDevice.h
index a35e92bc25..19bef21038 100644
--- a/src/gpu/SkGpuDevice.h
+++ b/src/gpu/SkGpuDevice.h
@@ -15,6 +15,7 @@
 #include "SkPicture.h"
 #include "SkRegion.h"
 #include "SkSurface.h"
+#include "GrDrawContext.h"
 #include "GrContext.h"
 #include "GrSurfacePriv.h"
 
@@ -53,7 +54,7 @@ public:
     static SkGpuDevice* Create(GrContext*, SkSurface::Budgeted, const SkImageInfo&,
                                int sampleCount, const SkSurfaceProps*, InitContents);
 
-    virtual ~SkGpuDevice();
+    ~SkGpuDevice() override {}
 
     SkGpuDevice* cloneDevice(const SkSurfaceProps& props) {
         SkBaseDevice* dev = this->onCreateDevice(CreateInfo(this->imageInfo(), kPossible_TileUsage,
@@ -153,12 +154,14 @@ protected:
                                           const SkMatrix*, const SkPaint*) override;
 
 private:
-    GrContext*                      fContext;
+    // We want these unreffed in DrawContext, RenderTarget, GrContext order.
+    SkAutoTUnref<GrContext>         fContext;
+    SkAutoTUnref<GrRenderTarget>    fRenderTarget;
+    SkAutoTUnref<GrDrawContext>     fDrawContext;
+
     SkAutoTUnref<const SkClipStack> fClipStack;
     SkIPoint                        fClipOrigin;
-    GrClip                          fClip;
-    SkAutoTUnref<GrDrawContext>     fDrawContext;
-    GrRenderTarget*                 fRenderTarget;
+    GrClip                          fClip;;
     // remove when our clients don't rely on accessBitmap()
     SkBitmap                        fLegacyBitmap;
     bool                            fNeedClear;