clarify samplecount field in imagegpu

src/image/SkImage_Gpu.cpp

 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkImage_Base.h"
 #include "SkImagePriv.h"
 #include "SkBitmap.h"
 #include "SkCanvas.h"
 #include "SkSurface.h"
 #include "GrContext.h"
 #include "GrTexture.h"
 
 class SkImage_Gpu : public SkImage_Base {
 public:
     SK_DECLARE_INST_COUNT(SkImage_Gpu)
 
-    SkImage_Gpu(const SkBitmap&, int sampleCount);
+    SkImage_Gpu(const SkBitmap&, int sampleCountForNewSurfaces);
 
     void onDraw(SkCanvas*, SkScalar x, SkScalar y, const SkPaint*) const SK_OVERRIDE;
     void onDrawRect(SkCanvas*, const SkRect* src, const SkRect& dst,
                     const SkPaint*) const SK_OVERRIDE;
     SkSurface* onNewSurface(const SkImageInfo&, const SkSurfaceProps&) const SK_OVERRIDE;
     GrTexture* onGetTexture() const SK_OVERRIDE;
     bool getROPixels(SkBitmap*) const SK_OVERRIDE;
 
     GrTexture* getTexture() const { return fBitmap.getTexture(); }
 
     SkShader* onNewShader(SkShader::TileMode,
                                   SkShader::TileMode,
                                   const SkMatrix* localMatrix) const SK_OVERRIDE;
 
     bool isOpaque() const SK_OVERRIDE;
 
 private:
     SkBitmap    fBitmap;
-    const int   fSampleCount;   // 0 if we weren't built from a surface
+    const int   fSampleCountForNewSurfaces;   // 0 if we don't know
 
     typedef SkImage_Base INHERITED;
 };
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkImage_Gpu::SkImage_Gpu(const SkBitmap& bitmap, int sampleCount)
+SkImage_Gpu::SkImage_Gpu(const SkBitmap& bitmap, int sampleCountForNewSurfaces)
     : INHERITED(bitmap.width(), bitmap.height(), NULL)
     , fBitmap(bitmap)
-    , fSampleCount(sampleCount)
+    , fSampleCountForNewSurfaces(sampleCountForNewSurfaces)
 {
     SkASSERT(fBitmap.getTexture());
 }
 
 SkShader* SkImage_Gpu::onNewShader(SkShader::TileMode tileX,
                                    SkShader::TileMode tileY,
                                    const SkMatrix* localMatrix) const
 {
     return SkShader::CreateBitmapShader(fBitmap, tileX, tileY, localMatrix);
 }
 
 void SkImage_Gpu::onDraw(SkCanvas* canvas, SkScalar x, SkScalar y, const SkPaint* paint) const {
     canvas->drawBitmap(fBitmap, x, y, paint);
 }
 
 void SkImage_Gpu::onDrawRect(SkCanvas* canvas, const SkRect* src, const SkRect& dst,
                                    const SkPaint* paint) const {
     canvas->drawBitmapRectToRect(fBitmap, src, dst, paint);
 }
 
 SkSurface* SkImage_Gpu::onNewSurface(const SkImageInfo& info, const SkSurfaceProps& props) const {
     GrContext* ctx = this->getTexture()->getContext();
-    return SkSurface::NewRenderTarget(ctx, info, fSampleCount, &props);
+    return SkSurface::NewRenderTarget(ctx, info, fSampleCountForNewSurfaces, &props);
 }
 
 GrTexture* SkImage_Gpu::onGetTexture() const {
     return fBitmap.getTexture();
 }
 
 bool SkImage_Gpu::getROPixels(SkBitmap* dst) const {
     return fBitmap.copyTo(dst, kN32_SkColorType);
 }
 
 bool SkImage_Gpu::isOpaque() const {
     return fBitmap.isOpaque();
 }
 
 ///////////////////////////////////////////////////////////////////////////////
 
-SkImage* SkNewImageFromBitmapTexture(const SkBitmap& bitmap, int sampleCount) {
+SkImage* SkNewImageFromBitmapTexture(const SkBitmap& bitmap, int sampleCountForNewSurfaces) {
     if (NULL == bitmap.getTexture()) {
         return NULL;
     }
-    return SkNEW_ARGS(SkImage_Gpu, (bitmap, sampleCount));
+    return SkNEW_ARGS(SkImage_Gpu, (bitmap, sampleCountForNewSurfaces));
 }
 
 SkImage* SkImage::NewTexture(const SkBitmap& bitmap) {
     return SkNewImageFromBitmapTexture(bitmap, 0);
 }
 
 GrTexture* SkTextureImageGetTexture(SkImage* image) {
     return ((SkImage_Gpu*)image)->getTexture();
 }