First pass at drawAtlas batching.

include/gpu/GrDrawContext.h

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrDrawContext_DEFINED
 #define GrDrawContext_DEFINED
 
@@ skipping 15 matching lines @@
 class GrTextContext;
 class SkDrawFilter;
 struct SkIPoint;
 struct SkIRect;
 class SkMatrix;
 class SkPaint;
 class SkPath;
 struct SkPoint;
 struct SkRect;
 class SkRRect;
+struct SkRSXform;
 class SkTextBlob;
 
 /*
  * A helper object to orchestrate draws
  */
 class SK_API GrDrawContext : public SkRefCnt {
 public:
     ~GrDrawContext() override;
 
     void copySurface(GrRenderTarget* dst, GrSurface* src,
@@ skipping 169 matching lines @@
                       const SkMatrix& viewMatrix,
                       GrPrimitiveType primitiveType,
                       int vertexCount,
                       const SkPoint positions[],
                       const SkPoint texs[],
                       const GrColor colors[],
                       const uint16_t indices[],
                       int indexCount);
 
     /**
+     * Draws textured sprites from an atlas with a paint.
+     *
+     * @param   paint           describes how to color pixels.
+     * @param   viewMatrix      transformation matrix
+     * @param   spriteCount     number of sprites.
+     * @param   xform           array of compressed transformation data, required.
+     * @param   texRect         array of texture rectangles used to access the paint.
+     * @param   colors          optional array of per-sprite colors, supercedes
+     *                          the paint's color field.
+     */
+    void drawAtlas(GrRenderTarget*,
+                   const GrClip&,
+                   const GrPaint& paint,
+                   const SkMatrix& viewMatrix,
+                   int spriteCount,
+                   const SkRSXform xform[],
+                   const SkRect texRect[],
+                   const SkColor colors[]);
+    
+    /**
      * Draws an oval.
      *
      * @param paint         describes how to color pixels.
      * @param viewMatrix    transformation matrix
      * @param oval          the bounding rect of the oval.
      * @param strokeInfo    the stroke information (width, join, cap) and
      *                      the dash information (intervals, count, phase).
      */
     void drawOval(GrRenderTarget*,
                   const GrClip&,
@@ skipping 27 matching lines @@
     void drawBatch(GrPipelineBuilder* pipelineBuilder, GrBatch* batch);
 
     GrContext*          fContext;     // owning context -> no ref
     GrDrawTarget*       fDrawTarget;
     GrTextContext*      fTextContext; // lazily created
 
     SkSurfaceProps      fSurfaceProps;
 };
 
 #endif