1 files changed, 19 insertions, 0 deletions
diff --git a/src/core/SkSpecialImage.cpp b/src/core/SkSpecialImage.cpp
index 61acd3fc69..679c09464f 100644
--- a/src/core/SkSpecialImage.cpp
+++ b/src/core/SkSpecialImage.cpp
@@ -337,6 +337,25 @@ sk_sp<SkSpecialImage> SkSpecialImage::MakeFromRaster(const SkIRect& subset,
     return sk_make_sp<SkSpecialImage_Raster>(subset, *srcBM, props);
 }
 
+sk_sp<SkSpecialImage> SkSpecialImage::CopyFromRaster(const SkIRect& subset,
+                                                     const SkBitmap& bm,
+                                                     const SkSurfaceProps* props) {
+    SkASSERT(rect_fits(subset, bm.width(), bm.height()));
+
+    if (!bm.pixelRef()) {
+        return nullptr;
+    }
+
+    SkBitmap tmp;
+    if (!tmp.tryAllocPixels(bm.info().makeWH(subset.width(), subset.height()))) {
+        return nullptr;
+    }
+    if (!bm.readPixels(tmp.info(), tmp.getPixels(), tmp.rowBytes(), subset.x(), subset.y())) {
+        return nullptr;
+    }
+    return sk_make_sp<SkSpecialImage_Raster>(subset, tmp, props);
+}
+
 #if SK_SUPPORT_GPU
 ///////////////////////////////////////////////////////////////////////////////
 static sk_sp<SkImage> wrap_proxy_in_image(GrContext* context, sk_sp<GrTextureProxy> proxy,