Make SkSHA1 and SkM5 use common SkDigestHash result type

src/utils/SkBitmapTransformer.h

 
 /*
  * Copyright 2012 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #ifndef SkBitmapTransformer_DEFINED
 #define SkBitmapTransformer_DEFINED
@@ skipping 44 matching lines @@
      * Returns true iff we can convert between fBitmap and fPixelFormat.
      * If this returns false, the return values of any other methods will
      * be meaningless!
      *
      * @param logReason whether to log the reason why this combination
      *                  is unsupported (only applies in debug mode)
      */
     bool isValid(bool logReason=false) const;
 
     /**
+     * Returns the number of rows in the bitmap.
+     */
+    int numRows() const {
+        return fBitmap.height();
+    }
+
+    /**
      * Returns the number of bytes needed to store a single row of the
      * bitmap's pixels if converted to pixelFormat.
      */
     size_t bytesNeededPerRow() const {
         // This is hard-coded for the single supported PixelFormat.
         return fBitmap.width() * 4;
     }
 
     /**
      * Returns the number of bytes needed to store the entire bitmap
@@ skipping 14 matching lines @@
      * will fail immediately and return false.
      * We force the caller to pass this in to avoid buffer overruns in
      * unanticipated cases.
      *
      * All pixels for all rows will be written into dstBuffer as a
      * single contiguous blob (no skipped pixels at the end of each
      * row).
      */
     bool copyBitmapToPixelBuffer (void *dstBuffer, size_t dstBufferSize) const;
 
+    /**
+     * Writes a single row of the bitmap into dstBuffer, using the
+     * already-specified pixelFormat. Returns true if successful.
+     *
+     * row is the 0-indexed row number within the bitmap; if the row
+     * specified is outside of the range [0, numRows()-1], then this method
+     * will fail.
+     *
+     * dstBufferSize is the maximum allowable bytes to write into dstBuffer;
+     * if that is not large enough to hold the row, then this
+     * will fail immediately and return false.
+     * We force the caller to pass this in to avoid buffer overruns in
+     * unanticipated cases.
+     */
+    bool copyRowToPixelBuffer (int row, void *dstBuffer, size_t dstBufferSize) const;
+
 private:
     const SkBitmap& fBitmap;
     const PixelFormat fPixelFormat;
 };
 
 #endif