Add SkSpecialImage::makeTextureImage entry point & update filterInput

src/core/SkImageFilter.cpp

 /*
  * Copyright 2012 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImageFilter.h"
 #include "SkImageFilterCacheKey.h"
 
@@ skipping 578 matching lines @@
 
 SkSpecialImage* SkImageFilter::filterInput(int index,
                                            SkSpecialImage* src,
                                            const Context& ctx,
                                            SkIPoint* offset) const {
     SkImageFilter* input = this->getInput(index);
     if (!input) {
         return SkRef(src);
     }
 
-    return input->filterImage(src, this->mapContext(ctx), offset);
+    SkAutoTUnref<SkSpecialImage> result(input->filterImage(src, this->mapContext(ctx), offset));
+
+#if SK_SUPPORT_GPU
+    if (src->peekTexture() && result && !result->peekTexture()) {
+        // Keep the result on the GPU - this is still required for some
+        // image filters that don't support GPU in all cases
+        GrContext* context = src->peekTexture()->getContext();
+        return result->makeTextureImage(src->internal_getProxy(), context).release();
+    }
+#endif
+
+    return result.release();
 }
 
 #if SK_SUPPORT_GPU
 
 bool SkImageFilter::filterInputGPUDeprecated(int index, SkImageFilter::Proxy* proxy,
                                              const SkBitmap& src, const Context& ctx,
                                              SkBitmap* result, SkIPoint* offset) const {
     SkImageFilter* input = this->getInput(index);
     if (!input) {
         return true;
@@ skipping 201 matching lines @@
     }
     return dev;
 }
 
 bool SkImageFilter::DeviceProxy::filterImage(const SkImageFilter* filter, const SkBitmap& src,
                                        const SkImageFilter::Context& ctx,
                                        SkBitmap* result, SkIPoint* offset) {
     return fDevice->filterImage(filter, src, ctx, result, offset);
 }