Move all knowledge of X sampling into SkScaledCodec

src/codec/SkBmpRLECodec.h

 /*
  * 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 "SkBmpCodec.h"
 #include "SkColorTable.h"
 #include "SkImageInfo.h"
+#include "SkSampler.h"
 #include "SkTypes.h"
 
 /*
  * This class implements the decoding for bmp images that use an RLE encoding
  */
 class SkBmpRLECodec : public SkBmpCodec {
 public:
 
     /*
      * Creates an instance of the decoder
@@ skipping 11 matching lines @@
      *               headers
      * @param rowOrder indicates whether rows are ordered top-down or bottom-up
      * @param RLEBytes indicates the amount of data left in the stream
      *                 after decoding the headers
      */
     SkBmpRLECodec(const SkImageInfo& srcInfo, SkStream* stream,
             uint16_t bitsPerPixel, uint32_t numColors, uint32_t bytesPerColor,
             uint32_t offset, SkCodec::SkScanlineOrder rowOrder,
             size_t RLEBytes);
 
+    int setSampleX(int);
+
 protected:
 
     Result onGetPixels(const SkImageInfo& dstInfo, void* dst,
                        size_t dstRowBytes, const Options&, SkPMColor*,
                        int*) override;
 
     SkCodec::Result prepareToDecode(const SkImageInfo& dstInfo,
             const SkCodec::Options& options, SkPMColor inputColorPtr[],
             int* inputColorCount) override;
 
@@ skipping 25 matching lines @@
     /*
      * Set an RLE24 pixel from R, G, B values
      */
     void setRGBPixel(void* dst, size_t dstRowBytes,
                      const SkImageInfo& dstInfo, uint32_t x, uint32_t y,
                      uint8_t red, uint8_t green, uint8_t blue);
 
     Result decodeRows(const SkImageInfo& dstInfo, void* dst, size_t dstRowBytes,
                       const Options& opts) override;
 
+    SkSampler* getSampler() override;
+
     SkAutoTUnref<SkColorTable>          fColorTable;    // owned
     const uint32_t                      fNumColors;
     const uint32_t                      fBytesPerColor;
     const uint32_t                      fOffset;
     SkAutoTDeleteArray<uint8_t>         fStreamBuffer;
     size_t                              fRLEBytes;
     uint32_t                            fCurrRLEByte;
     int                                 fSampleX;
+    SkAutoTDelete<SkSampler>            fSampler;
 
     typedef SkBmpCodec INHERITED;
 };