add paint::getFontBounds()

include/core/SkPaint.h

 /*
  * Copyright 2006 The Android Open Source Project
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkPaint_DEFINED
 #define SkPaint_DEFINED
 
@@ skipping 903 matching lines @@
     /** Return the path (outline) for the specified text.
         Note: just like SkCanvas::drawText, this will respect the Align setting
               in the paint.
     */
     void getTextPath(const void* text, size_t length, SkScalar x, SkScalar y,
                      SkPath* path) const;
 
     void getPosTextPath(const void* text, size_t length,
                         const SkPoint pos[], SkPath* path) const;
 
+    /**
+     *  Return a rectangle that represents the union of the bounds of all
+     *  of the glyphs, but each one positioned at (0,0). This may be conservatively large, and
+     *  will not take into account any hinting, but will respect any text-scale-x or text-skew-x
+     *  on this paint.
+     */
+    SkRect getFontBounds() const;
+
     // returns true if the paint's settings (e.g. xfermode + alpha) resolve to
     // mean that we need not draw at all (e.g. SrcOver + 0-alpha)
     bool nothingToDraw() const;
 
     ///////////////////////////////////////////////////////////////////////////
     // would prefer to make these private...
 
     /** Returns true if the current paint settings allow for fast computation of
      bounds (i.e. there is nothing complex like a patheffect that would make
      the bounds computation expensive.
@@ skipping 166 matching lines @@
     friend class GrBitmapTextContext;
     friend class GrDistanceFieldTextContext;
     friend class GrStencilAndCoverTextContext;
     friend class GrPathRendering;
     friend class GrGLPathRendering;
     friend class SkTextToPathIter;
     friend class SkCanonicalizePaint;
 };
 
 #endif