SkGpuDevice: Delay locking bitmap pixels until we have a known texture cache miss.

src/gpu/SkGpuDevice.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 "SkGpuDevice.h"
 
 #include "effects/GrTextureDomainEffect.h"
@@ skipping 1349 matching lines @@
  *  and that non-texture portion of the GrPaint has already been setup.
  */
 void SkGpuDevice::internalDrawBitmap(const SkBitmap& bitmap,
                                      const SkRect& srcRect,
                                      const SkMatrix& m,
                                      const GrTextureParams& params,
                                      GrPaint* grPaint) {
     SkASSERT(bitmap.width() <= fContext->getMaxTextureSize() &&
              bitmap.height() <= fContext->getMaxTextureSize());
 
-    SkAutoLockPixels alp(bitmap, !bitmap.getTexture());
-    if (!bitmap.getTexture() && !bitmap.readyToDraw()) {
-        SkDebugf("nothing to draw\n");
-        return;
-    }
-
     GrTexture* texture;
     SkAutoCachedTexture act(this, bitmap, &params, &texture);
     if (NULL == texture) {
         return;
     }
 
     GrRect dstRect(srcRect);
     GrRect paintRect;
     SkScalar wInv = SkScalarInvert(SkIntToScalar(bitmap.width()));
     SkScalar hInv = SkScalarInvert(SkIntToScalar(bitmap.height()));
@@ skipping 472 matching lines @@
                          GrTexture* texture,
                          bool needClear)
     : SkDevice(make_bitmap(context, texture->asRenderTarget())) {
 
     GrAssert(texture && texture->asRenderTarget());
     // This constructor is called from onCreateCompatibleDevice. It has locked the RT in the texture
     // cache. We pass true for the third argument so that it will get unlocked.
     this->initFromRenderTarget(context, texture->asRenderTarget(), true);
     fNeedClear = needClear;
 }