Use per-typeface sets of glyphs for nvpr text

src/gpu/GrGpu.h

 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef GrGpu_DEFINED
 #define GrGpu_DEFINED
 
 #include "GrDrawTarget.h"
 #include "GrClipMaskManager.h"
 #include "GrPathRendering.h"
 #include "SkPath.h"
 
 class GrContext;
 class GrIndexBufferAllocPool;
 class GrPath;
 class GrPathRange;
 class GrPathRenderer;
 class GrPathRendererChain;
 class GrStencilBuffer;
 class GrVertexBufferAllocPool;
+class SkDescriptor;
+class SkTypeface;
 
 class GrGpu : public GrDrawTarget {
 public:
 
     /**
      * Additional blend coefficients for dual source blending, not exposed
      * through GrPaint/GrContext.
      */
     enum ExtendedBlendCoeffs {
         // source 2 refers to second output color when
@@ skipping 108 matching lines @@
      */
     GrIndexBuffer* createIndexBuffer(size_t size, bool dynamic);
 
     /**
      * Creates a path object that can be stenciled using stencilPath(). It is
      * only legal to call this if the caps report support for path stenciling.
      */
     GrPath* createPath(const SkPath& path, const SkStrokeRec& stroke);
 
     /**
-     * Creates a path range object that can be used to draw multiple paths via
-     * drawPaths(). It is only legal to call this if the caps report support for
-     * path rendering.
+     * Creates a range of glyph paths, indexed by glyph id. The glyphs will have an

[bsalomon, 2014/09/15 14:16:21]

I'm wondering if the PR class should be accessible to the text context to avoid
having a bunch of shims on GrGpu.

[Chris Dalton, 2014/09/15 21:05:25]

That could work, but I think createPath() ought to follow the same pattern.
Should we change the behavior for that one too? What about having the
createPath/createGlyphs methods on the GrContext? Should we take both out of
there as well?

+     * inverted y-direction in order to match the raw font path data.
+     *
+     * @param SkTypeface   Typeface that defines the glyphs.
+     *                     If null, the default typeface will be used.
+     *
+     * @param SkDescriptor Additional font configuration that specifies the font's size,
+     *                     stroke, and other flags. This will generally come from an
+     *                     SkGlyphCache.
+     *
+     *                     It is recommended to leave this value null when possible, in
+     *                     which case the glyphs will be loaded directly from the font's
+     *                     raw path data and sized at SkPaint::kCanonicalTextSizeForPaths.
+     *                     This results in less memory usage and more efficient GPU paths.
+     *
+     *                     If non-null, the glyph paths will match the font descriptor,
+     *                     including with the stroke information baked directly into
+     *                     the outlines.
+     *
+     * @param SkStrokeRec  Common stroke that the GPU will apply to every path. Note
+     *                     that if the glyph outlines contain strokes from the font
+     *                     descriptor, this stroke will be applied on top of those
+     *                     outlines.
+     *
+     * It is only legal to call this if the caps report support for path rendering.
      */
-    GrPathRange* createPathRange(size_t size, const SkStrokeRec&);
+    GrPathRange* createGlyphs(const SkTypeface*, const SkDescriptor*, const SkStrokeRec&);
 
     /**
      * Returns an index buffer that can be used to render quads.
      * Six indices per quad: 0, 1, 2, 0, 2, 3, etc.
      * The max number of quads can be queried using GrIndexBuffer::maxQuads().
      * Draw with kTriangles_GrPrimitiveType
      * @ return the quad index buffer
      */
     const GrIndexBuffer* getQuadIndexBuffer() const;
 
@@ skipping 351 matching lines @@
     // counts number of uses of vertex/index pool in the geometry stack
     int                                                                 fVertexPoolUseCnt;
     int                                                                 fIndexPoolUseCnt;
     // these are mutable so they can be created on-demand
     mutable GrIndexBuffer*                                              fQuadIndexBuffer;
 
     typedef GrDrawTarget INHERITED;
 };
 
 #endif