add drawImageNine

this also exposes nine-patch drawing directly to devices, and creates a shared iterator for unrolling a nine-patch into single rect->rect draws.

BUG=skia:

Review URL: https://codereview.chromium.org/1211583003

1 files changed, 16 insertions, 0 deletions

diff --git a/src/utils/SkDeferredCanvas.cpp b/src/utils/SkDeferredCanvas.cpp
index ccf0b012b1..8e34235848 100644
--- a/src/utils/SkDeferredCanvas.cpp
+++ b/src/utils/SkDeferredCanvas.cpp
@@ -229,6 +229,9 @@ protected:
     void drawImageRect(const SkDraw&, const SkImage*, const SkRect*, const SkRect&,
                        const SkPaint&) override
         {SkASSERT(0);}
+    void drawImageNine(const SkDraw&, const SkImage*, const SkIRect&, const SkRect&,
+                       const SkPaint&) override
+        {SkASSERT(0);}
     void drawText(const SkDraw&, const void* text, size_t len,
                   SkScalar x, SkScalar y, const SkPaint& paint) override
         {SkASSERT(0);}
@@ -903,6 +906,19 @@ void SkDeferredCanvas::onDrawImageRect(const SkImage* image, const SkRect* src,
     this->recordedDrawCommand();
 }
 
+void SkDeferredCanvas::onDrawImageNine(const SkImage* image, const SkIRect& center,
+                                       const SkRect& dst, const SkPaint* paint) {
+    if (fDeferredDrawing &&
+        this->isFullFrame(&dst, paint) &&
+        isPaintOpaque(paint, image)) {
+        this->getDeferredDevice()->skipPendingCommands();
+    }
+    
+    AutoImmediateDrawIfNeeded autoDraw(*this, image, paint);
+    this->drawingCanvas()->drawImageNine(image, center, dst, paint);
+    this->recordedDrawCommand();
+}
+
 void SkDeferredCanvas::onDrawBitmapNine(const SkBitmap& bitmap,
                                         const SkIRect& center, const SkRect& dst,
                                         const SkPaint* paint) {