Begin atlasing

include/gpu/GrRect.h

Index: include/gpu/GrRect.h
diff --git a/include/gpu/GrRect.h b/include/gpu/GrRect.h
index ddb23b5a19c8388c0771ac10a5c6967ea2b1be17..14130f831c3f5fb185335cc8476e42627253f6c2 100644
--- a/include/gpu/GrRect.h
+++ b/include/gpu/GrRect.h
@@ -20,6 +20,18 @@ struct GrIRect16 {
         return r;
     }
 
+    static GrIRect16 SK_WARN_UNUSED_RESULT MakeWH(int16_t w, int16_t h) {
+        GrIRect16 r;
+        r.set(0, 0, w, h);
+        return r;
+    }
+
+    static GrIRect16 SK_WARN_UNUSED_RESULT MakeXYWH(int16_t x, int16_t y, int16_t w, int16_t h) {
+        GrIRect16 r;
+        r.set(x, y, x + w, y + h);
+        return r;
+    }
+
     int width() const { return fRight - fLeft; }
     int height() const { return fBottom - fTop; }
     int area() const { return this->width() * this->height(); }
@@ -27,6 +39,13 @@ struct GrIRect16 {
 
     void setEmpty() { memset(this, 0, sizeof(*this)); }
 
+    void set(int16_t left, int16_t top, int16_t right, int16_t bottom) {
+        fLeft = left;
+        fTop = top;
+        fRight = right;
+        fBottom = bottom;
+    }
+
     void set(const SkIRect& r) {
         fLeft   = SkToS16(r.fLeft);
         fTop    = SkToS16(r.fTop);