detect when we can filter bitmaps/images directly, w/o a tmp layer

src/core/SkDevice.cpp

Index: src/core/SkDevice.cpp
diff --git a/src/core/SkDevice.cpp b/src/core/SkDevice.cpp
index 34c171db9071109cb668619964b037dbee95ad21..cf4a279b355523be1a982af8a989e014beaf7938 100644
--- a/src/core/SkDevice.cpp
+++ b/src/core/SkDevice.cpp
@@ -402,6 +402,29 @@ void SkBaseDevice::drawTextOnPath(const SkDraw& draw, const void* text, size_t b
 
 //////////////////////////////////////////////////////////////////////////////////////////
 
+void SkBaseDevice::drawBitmapAsSprite(const SkDraw& draw, const SkBitmap& bitmap, int x, int y,
+                                      const SkPaint& paint) {
+    SkImageFilter* filter = paint.getImageFilter();
+    if (filter && !this->canHandleImageFilter(filter)) {
+        SkImageFilter::DeviceProxy proxy(this);
+        SkBitmap dst;
+        SkIPoint offset = SkIPoint::Make(0, 0);
+        SkMatrix matrix = *draw.fMatrix;
+        matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
+        const SkIRect clipBounds = bitmap.bounds();
+        SkAutoTUnref<SkImageFilter::Cache> cache(this->getImageFilterCache());
+        SkImageFilter::Context ctx(matrix, clipBounds, cache.get(),
+                                   SkImageFilter::kApprox_SizeConstraint);
+        if (filter->filterImage(&proxy, bitmap, ctx, &dst, &offset)) {
+            SkPaint tmpUnfiltered(paint);
+            tmpUnfiltered.setImageFilter(nullptr);
+            this->drawSprite(draw, dst, x + offset.x(), y + offset.y(), tmpUnfiltered);
+        }
+    } else {
+        this->drawSprite(draw, bitmap, x, y, paint);
+    }
+}
+
 uint32_t SkBaseDevice::filterTextFlags(const SkPaint& paint) const {
     uint32_t flags = paint.getFlags();