add SkCanvas::drawAtlas

src/core/SkCanvas.cpp

Index: src/core/SkCanvas.cpp
diff --git a/src/core/SkCanvas.cpp b/src/core/SkCanvas.cpp
index 14372611f8cfbed8a667a0a3b9eeedaf853aa17f..1ce0a30534e40c206ed184963049d27152de9111 100644
--- a/src/core/SkCanvas.cpp
+++ b/src/core/SkCanvas.cpp
@@ -1801,6 +1801,39 @@ void SkCanvas::drawSprite(const SkBitmap& bitmap, int left, int top, const SkPai
     this->onDrawSprite(bitmap, left, top, paint);
 }
 
+#include "SkRSXform.h"
+void SkCanvas::drawAtlas(const SkImage* atlas, const SkRSXform xform[], const SkRect tex[],
+                         const SkColor colors[], int n, const SkRect* cull, const SkPaint* paint) {
+//    this->drawImage(atlas, 0, 0, paint);
+
+    SkPaint pnt;
+    if (paint) {
+        pnt = *paint;
+    }
+//    pnt.setStyle(SkPaint::kStroke_Style);
+
+    SkPath path;
+    for (int i = 0; i < n; ++i) {
+        SkPoint quad[4];
+        xform[i].toQuad(tex[i].width(), tex[i].height(), quad);
+
+        SkMatrix localM;
+        localM.setRSXform(xform[i]);
+        localM.preTranslate(-tex[i].left(), -tex[i].top());
+
+        pnt.setShader(atlas->newShader(SkShader::kClamp_TileMode, SkShader::kClamp_TileMode,
+                                       &localM))->unref();
+        if (colors) {
+            pnt.setColorFilter(SkColorFilter::CreateModeFilter(colors[i],
+                                                            SkXfermode::kModulate_Mode))->unref();
+        }
+    
+        path.rewind();
+        path.addPoly(quad, 4, true);
+        this->drawPath(path, pnt);
+    }
+}
+
 //////////////////////////////////////////////////////////////////////////////
 //  These are the virtual drawing methods
 //////////////////////////////////////////////////////////////////////////////