Turn on MPD threading in nanobench.

src/core/SkBitmapProcShader.cpp

 
 /*
  * Copyright 2011 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 #include "SkColorPriv.h"
 #include "SkReadBuffer.h"
 #include "SkWriteBuffer.h"
@@ skipping 74 matching lines @@
 }
 
 static bool valid_for_drawing(const SkBitmap& bm) {
     if (0 == bm.width() || 0 == bm.height()) {
         return false;   // nothing to draw
     }
     if (NULL == bm.pixelRef()) {
         return false;   // no pixels to read
     }
     if (kIndex_8_SkColorType == bm.colorType()) {
-        // ugh, I have to lock-pixels to inspect the colortable
-        SkAutoLockPixels alp(bm);
-        if (!bm.getColorTable()) {
+        SkBitmap copy(bm);          // Locking and unlocking pixels is not thread safe,
+        SkAutoLockPixels alp(copy); // but we need to call it before getColorTable() is safe.
+        if (!copy.getColorTable()) {
             return false;
         }
     }
     return true;
 }
 
 SkShader::Context* SkBitmapProcShader::onCreateContext(const ContextRec& rec, void* storage) const {
     if (!fRawBitmap.getTexture() && !valid_for_drawing(fRawBitmap)) {
         return NULL;
     }
@@ skipping 366 matching lines @@
 
 #else
 
 bool SkBitmapProcShader::asFragmentProcessor(GrContext*, const SkPaint&, const SkMatrix*, GrColor*,
                                              GrFragmentProcessor**) const {
     SkDEBUGFAIL("Should not call in GPU-less build");
     return false;
 }
 
 #endif