Revert of Remove deprecated paths from image filter infrastructure. (patchset #2 id:20001 of https://codereview.chromium.org/1888243003/ )

Reason for revert:
Surprisingly (appallingly?), Chrome calls canFilterImageGPU

Original issue's description:
> Remove deprecated paths from image filter infrastructure.
>
> Now that there are no filterImageGPUDeprecated() implementations,
> we can being to rip out the deprecated infrastructure.
>
> BUG=skia:
> GOLD_TRYBOT_URL= https://gold.skia.org/search2?unt=true&query=source_type%3Dgm&master=false&issue=1888243003
>
> Committed: https://skia.googlesource.com/skia/+/6fb3cd7209849e665635ac17ef4eef4ad63e7f61

TBR=reed@google.com,senorblanco@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=skia:

Review URL: https://codereview.chromium.org/1893993002

2 files changed, 73 insertions, 0 deletions

diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 2377b57dfb..c15aeccf82 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -280,6 +280,28 @@ protected:
     */
     virtual const SkBitmap& onAccessBitmap() = 0;
 
+    /**
+     *  Override and return true for filters that the device can handle
+     *  intrinsically. Doing so means that SkCanvas will pass-through this
+     *  filter to drawSprite and drawDevice (and potentially filterImage).
+     *  Returning false means the SkCanvas will have apply the filter itself,
+     *  and just pass the resulting image to the device.
+     */
+    virtual bool canHandleImageFilter(const SkImageFilter*) { return false; }
+
+    /**
+     *  Related (but not required) to canHandleImageFilter, this method returns
+     *  true if the device could apply the filter to the src bitmap and return
+     *  the result (and updates offset as needed).
+     *  If the device does not recognize or support this filter,
+     *  it just returns false and leaves result and offset unchanged.
+     */
+    virtual bool filterImage(const SkImageFilter*, const SkBitmap&,
+                             const SkImageFilter::Context&,
+                             SkBitmap* /*result*/, SkIPoint* /*offset*/) {
+        return false;
+    }
+
 protected:
     virtual sk_sp<SkSurface> makeSurface(const SkImageInfo&, const SkSurfaceProps&);
     virtual bool onPeekPixels(SkPixmap*) { return false; }
diff --git a/include/core/SkImageFilter.h b/include/core/SkImageFilter.h
index 554f9f8335..dcd25bf91b 100644
--- a/include/core/SkImageFilter.h
+++ b/include/core/SkImageFilter.h
@@ -116,6 +116,12 @@ public:
 
         virtual SkBaseDevice* createDevice(int width, int height,
                                            TileUsage usage = kNever_TileUsage) = 0;
+
+        // Returns true if the proxy handled the filter itself. If this returns
+        // false then the filter's code will be called.
+        virtual bool filterImage(const SkImageFilter*, const SkBitmap& src,
+                                 const SkImageFilter::Context&,
+                                 SkBitmap* result, SkIPoint* offset) = 0;
     };
 
     class DeviceProxy : public Proxy {
@@ -125,6 +131,11 @@ public:
         SkBaseDevice* createDevice(int width, int height,
                                    TileUsage usage = kNever_TileUsage) override;
 
+        // Returns true if the proxy handled the filter itself. If this returns
+        // false then the filter's code will be called.
+        bool filterImage(const SkImageFilter*, const SkBitmap& src, const SkImageFilter::Context&,
+                         SkBitmap* result, SkIPoint* offset) override;
+
     private:
         SkBaseDevice* fDevice;
     };
@@ -164,6 +175,31 @@ public:
     SkIRect filterBounds(const SkIRect& src, const SkMatrix& ctm,
                          MapDirection = kReverse_MapDirection) const;
 
+    /**
+     *  Returns true if the filter can be processed on the GPU.  This is most
+     *  often used for multi-pass effects, where intermediate results must be
+     *  rendered to textures.  For single-pass effects, use asFragmentProcessor().
+     *  The default implementation returns asFragmentProcessor(NULL, NULL, SkMatrix::I(),
+     *  SkIRect()).
+     */
+    virtual bool canFilterImageGPU() const { return false; }
+
+    /**
+     *  Process this image filter on the GPU.  This is most often used for
+     *  multi-pass effects, where intermediate results must be rendered to
+     *  textures.  For single-pass effects, use asFragmentProcessor().  src is the
+     *  source image for processing, as a texture-backed bitmap.  result is
+     *  the destination bitmap, which should contain a texture-backed pixelref
+     *  on success.  offset is the amount to translate the resulting image
+     *  relative to the src when it is drawn. The default implementation does
+     *  single-pass processing using asFragmentProcessor().
+     */
+    virtual bool filterImageGPUDeprecated(Proxy*, const SkBitmap&, const Context&,
+                                          SkBitmap*, SkIPoint*) const {
+        SkASSERT(false);
+        return false;
+    }
+
 #if SK_SUPPORT_GPU
     static sk_sp<SkSpecialImage> DrawWithFP(GrContext* context, 
                                             sk_sp<GrFragmentProcessor> fp,
@@ -262,6 +298,18 @@ public:
                                       const Context&, 
                                       SkIPoint* offset) const;
 
+#if SK_SUPPORT_GPU
+    // Helper function which invokes GPU filter processing on the
+    // input at the specified "index". If the input is null, it leaves
+    // "result" and "offset" untouched, and returns true. If the input
+    // has a GPU implementation, it will be invoked directly.
+    // Otherwise, the filter will be processed in software and
+    // uploaded to the GPU.
+    bool filterInputGPUDeprecated(int index, SkImageFilter::Proxy* proxy,
+                                  const SkBitmap& src, const Context&,
+                                  SkBitmap* result, SkIPoint* offset) const;
+#endif
+
     SK_TO_STRING_PUREVIRT()
     SK_DEFINE_FLATTENABLE_TYPE(SkImageFilter)
 
@@ -392,6 +440,9 @@ protected:
      *  which are not capable of processing a smaller source bitmap into a
      *  larger destination.
      */
+    bool applyCropRectDeprecated(const Context&, Proxy* proxy, const SkBitmap& src,
+                                 SkIPoint* srcOffset, SkIRect* bounds, SkBitmap* result) const;
+
     sk_sp<SkSpecialImage> applyCropRect(const Context&, SkSpecialImage* src, SkIPoint* srcOffset,
                                         SkIRect* bounds) const;