drawTextRSXform

gm/drawatlas.cpp

 /*
  * Copyright 2015 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "gm.h"
 #include "SkCanvas.h"
 #include "SkRSXform.h"
@@ skipping 82 matching lines @@
 
         canvas->drawAtlas(fAtlas.get(), xform, tex, N, nullptr, &paint);
         canvas->translate(0, 100);
         canvas->drawAtlas(fAtlas.get(), xform, tex, colors, N, SkXfermode::kSrcIn_Mode, nullptr, &paint);
     }
 
 private:
     typedef GM INHERITED;
 };
 DEF_GM( return new DrawAtlasGM; )
+
+///////////////////////////////////////////////////////////////////////////////////////////////////
+
+DEF_SIMPLE_GM(drawTextRSXform, canvas, 1000, 1000) {
+    const char text[] = "ABCDFGHJKLMNOPQRSTUVWXYZ";
+    const int N = sizeof(text) - 1;
+    SkRSXform xform[N];
+
+    canvas->translate(0, 30);
+
+    SkScalar x = 20;
+    SkScalar dx = 20;
+    SkScalar rad = 0;
+    SkScalar drad = 2 * SK_ScalarPI / N;
+    for (int i = 0; i < N; ++i) {
+        xform[i].fSCos = SkScalarCos(rad);
+        xform[i].fSSin = SkScalarSin(rad);
+        xform[i].fTx = x;
+        xform[i].fTy = 0;
+        x += dx;
+        rad += drad;
+    }
+
+    SkPaint paint;
+    paint.setAntiAlias(true);
+    paint.setTextSize(20);
+    canvas->drawTextRSXform(text, N, xform, paint);
+}
+
+