Revert of Change device creation to see the (optional) layer-paint (patchset #9 id:160001 of https://codereview.chromium.org/988413003/)

Reason for revert:
need to have chrome opt-in for the older API before this can land (in chrome)

Original issue's description:
> Change device creation to see the (optional) layer-paint
>
> Motivation:
>
> PDFDevice currently relies on 1) being told that the layer's paint has an imagefilter, and in the case, it creates a rasterdevice. It then relies on (2) canvas itself sniffing the layer's paint and offering to apply-the-imagefilter to call drawSprite instead of drawDevice.
>
> This subtle interchange is fragile, and also does not support other unsupported PDF features like colorfilters. This CL is a step toward making this use-raster-instead-of-native approach to layers more completely in the subclass' hands.
>
> Committed: https://skia.googlesource.com/skia/+/1182d9a96b80bd12183ee7c81325a979a51ee0c0

TBR=halcanary@google.com,senorblanco@google.com,robertphillips@google.com
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true

Review URL: https://codereview.chromium.org/1008863002

1 files changed, 21 insertions, 27 deletions

diff --git a/include/core/SkDevice.h b/include/core/SkDevice.h
index 684a08404c..c7c5c30b3a 100644
--- a/include/core/SkDevice.h
+++ b/include/core/SkDevice.h
@@ -125,9 +125,10 @@ public:
     };
 
 protected:
-    enum TileUsage {
-        kPossible_TileUsage,    //!< the created device may be drawn tiled
-        kNever_TileUsage,       //!< the created device will never be drawn tiled
+    enum Usage {
+       kGeneral_Usage,
+       kSaveLayer_Usage,  // <! internal use only
+       kImageFilter_Usage // <! internal use only
     };
 
     struct TextFlags {
@@ -230,7 +231,7 @@ protected:
     virtual void drawPatch(const SkDraw&, const SkPoint cubics[12], const SkColor colors[4],
                            const SkPoint texCoords[4], SkXfermode* xmode, const SkPaint& paint);
     /** The SkDevice passed will be an SkDevice which was returned by a call to
-        onCreateDevice on this device with kNeverTile_TileExpectation.
+        onCreateCompatibleDevice on this device with kSaveLayer_Usage.
      */
     virtual void drawDevice(const SkDraw&, SkBaseDevice*, int x, int y,
                             const SkPaint&) = 0;
@@ -254,6 +255,14 @@ protected:
     virtual void unlockPixels() {}
 
     /**
+     *  Returns true if the device allows processing of this imagefilter. If
+     *  false is returned, then the filter is ignored. This may happen for
+     *  some subclasses that do not support pixel manipulations after drawing
+     *  has occurred (e.g. printing). The default implementation returns true.
+     */
+    virtual bool allowImageFilter(const SkImageFilter*) { return true; }
+
+    /**
      *  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).
@@ -327,39 +336,24 @@ protected:
                                           const SkPaint*);
 
     struct CreateInfo {
-        static SkPixelGeometry AdjustGeometry(const SkImageInfo&, TileUsage, SkPixelGeometry);
+        static SkPixelGeometry AdjustGeometry(const SkImageInfo&, Usage, SkPixelGeometry geo);
 
-        // The constructor may change the pixel geometry based on other parameters.
-        CreateInfo(const SkImageInfo& info, TileUsage tileUsage, SkPixelGeometry geo)
+        // The construct may change the pixel geometry based on usage as needed.
+        CreateInfo(const SkImageInfo& info, Usage usage, SkPixelGeometry geo)
             : fInfo(info)
-            , fTileUsage(tileUsage)
-            , fPixelGeometry(AdjustGeometry(info, tileUsage, geo))
+            , fUsage(usage)
+            , fPixelGeometry(AdjustGeometry(info, usage, geo))
         {}
 
-        const SkImageInfo       fInfo;
-        const TileUsage         fTileUsage;
-        const SkPixelGeometry   fPixelGeometry;
+        const SkImageInfo     fInfo;
+        const Usage           fUsage;
+        const SkPixelGeometry fPixelGeometry;
     };
 
-#ifdef SK_SUPPORT_LEGACY_ONCREATECOMPATIBLEDEVICE
-    // legacy method name -- please override onCreateDevice instead
     virtual SkBaseDevice* onCreateCompatibleDevice(const CreateInfo&) {
         return NULL;
     }
 
-    virtual SkBaseDevice* onCreateDevice(const CreateInfo& cinfo, const SkPaint* layerPaint) {
-        return this->onCreateCompatibleDevice(cinfo);
-    }
-#else
-    /**
-     *  Create a new device based on CreateInfo. If the paint is not null, then it represents a
-     *  preview of how the new device will be composed with its creator device (this).
-     */
-    virtual SkBaseDevice* onCreateDevice(const CreateInfo&, const SkPaint*) {
-        return NULL;
-    }
-#endif
-
     virtual void initForRootLayer(SkPixelGeometry geo);
 
 private: