diff --git a/include/core/SkBitmap.h b/include/core/SkBitmap.h
index 4ec3ea4..6fdde40 100644
--- a/include/core/SkBitmap.h
+++ b/include/core/SkBitmap.h
@@ -112,7 +112,7 @@
     int height() const { return fHeight; }
     /** Return the number of bytes between subsequent rows of the bitmap.
     */
-    int rowBytes() const { return fRowBytes; }
+    size_t rowBytes() const { return fRowBytes; }
 
     /** Return the shift amount per pixel (i.e. 0 for 1-byte per pixel, 1 for
         2-bytes per pixel configs, 2 for 4-bytes per pixel configs). Return 0
@@ -206,7 +206,7 @@
     /** Given a config and a width, this computes the optimal rowBytes value. This is called automatically
         if you pass 0 for rowBytes to setConfig().
     */
-    static int ComputeRowBytes(Config c, int width);
+    static size_t ComputeRowBytes(Config c, int width);
 
     /** Return the bytes-per-pixel for the specified config. If the config is
         not at least 1-byte per pixel, return 0, including for kNo_Config.
@@ -251,7 +251,7 @@
         ComputeRowBytes() is called to compute the optimal value. This resets
         any pixel/colortable ownership, just like reset().
     */
-    void setConfig(Config, int width, int height, int rowBytes = 0);
+    void setConfig(Config, int width, int height, size_t rowBytes = 0);
     /** Use this to assign a new pixel address for an existing bitmap. This
         will automatically release any pixelref previously installed. Only call
         this if you are handling ownership/lifetime of the pixel memory.
@@ -278,13 +278,12 @@
         @param dst      Location of destination buffer.
         @param dstSize  Size of destination buffer. Must be large enough to hold
                         pixels using indicated stride.
-        @param dstRowBytes  Width of each line in the buffer. If -1, uses
+        @param dstRowBytes  Width of each line in the buffer. If 0, uses
                             bitmap's internal stride.
         @param preserveDstPad Must we preserve padding in the dst
     */
-    bool copyPixelsTo(void* const dst, size_t dstSize, int dstRowBytes = -1,
-                      bool preserveDstPad = false)
-         const;
+    bool copyPixelsTo(void* const dst, size_t dstSize, size_t dstRowBytes = 0,
+                      bool preserveDstPad = false) const;
 
     /** Use the standard HeapAllocator to create the pixelref that manages the
         pixel memory. It will be sized based on the current width/height/config.
@@ -646,7 +645,7 @@
         kImageIsImmutable_Flag  = 0x04
     };
 
-    uint32_t    fRowBytes;
+    size_t      fRowBytes;
     uint32_t    fWidth;
     uint32_t    fHeight;
     uint8_t     fConfig;
@@ -655,14 +654,14 @@
 
     /* Internal computations for safe size.
     */
-    static Sk64 ComputeSafeSize64(Config config,
+    static Sk64 ComputeSafeSize64(Config   config,
                                   uint32_t width,
                                   uint32_t height,
-                                  uint32_t rowBytes);
+                                  size_t   rowBytes);
     static size_t ComputeSafeSize(Config   config,
                                   uint32_t width,
                                   uint32_t height,
-                                  uint32_t rowBytes);
+                                  size_t   rowBytes);
 
     /*  Unreference any pixelrefs or colortables
     */
diff --git a/src/core/SkBitmap.cpp b/src/core/SkBitmap.cpp
index 718a3fd..7db6527 100644
--- a/src/core/SkBitmap.cpp
+++ b/src/core/SkBitmap.cpp
@@ -181,7 +181,7 @@
     return bpp;
 }
 
-int SkBitmap::ComputeRowBytes(Config c, int width) {
+size_t SkBitmap::ComputeRowBytes(Config c, int width) {
     if (width < 0) {
         return 0;
     }
@@ -232,7 +232,7 @@
 Sk64 SkBitmap::ComputeSafeSize64(Config config,
                                  uint32_t width,
                                  uint32_t height,
-                                 uint32_t rowBytes) {
+                                 size_t rowBytes) {
     Sk64 safeSize;
     safeSize.setZero();
     if (height > 0) {
@@ -248,7 +248,7 @@
 size_t SkBitmap::ComputeSafeSize(Config config,
                                  uint32_t width,
                                  uint32_t height,
-                                 uint32_t rowBytes) {
+                                 size_t rowBytes) {
     Sk64 safeSize = ComputeSafeSize64(config, width, height, rowBytes);
     return (safeSize.is32() ? safeSize.get32() : 0);
 }
@@ -266,10 +266,10 @@
 
 ///////////////////////////////////////////////////////////////////////////////
 
-void SkBitmap::setConfig(Config c, int width, int height, int rowBytes) {
+void SkBitmap::setConfig(Config c, int width, int height, size_t rowBytes) {
     this->freePixels();
 
-    if ((width | height | rowBytes) < 0) {
+    if ((width | height) < 0) {
         goto err;
     }
 
@@ -465,11 +465,11 @@
 }
 
 bool SkBitmap::copyPixelsTo(void* const dst, size_t dstSize,
-                            int dstRowBytes, bool preserveDstPad) const {
+                            size_t dstRowBytes, bool preserveDstPad) const {
 
-    if (dstRowBytes == -1)
+    if (0 == dstRowBytes) {
         dstRowBytes = fRowBytes;
-    SkASSERT(dstRowBytes >= 0);
+    }
 
     if (getConfig() == kRLE_Index8_Config ||
         dstRowBytes < ComputeRowBytes(getConfig(), fWidth) ||
diff --git a/src/gpu/SkGr.cpp b/src/gpu/SkGr.cpp
index b10cf15..d76a34a 100644
--- a/src/gpu/SkGr.cpp
+++ b/src/gpu/SkGr.cpp
@@ -39,7 +39,7 @@
     // always skip a full 256 number of entries, even if we memcpy'd fewer
     dst += kGrColorTableSize;
 
-    if (bitmap.width() == bitmap.rowBytes()) {
+    if ((unsigned)bitmap.width() == bitmap.rowBytes()) {
         memcpy(dst, bitmap.getPixels(), bitmap.getSize());
     } else {
         // need to trim off the extra bytes per row