speculative revert change to pixmap for bitmapscaler

src/core/SkBitmapScaler.cpp

 /*
  * 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 "SkBitmapScaler.h"
 #include "SkBitmapFilter.h"
 #include "SkRect.h"
@@ skipping 230 matching lines @@
             return SkBitmapScaler::RESIZE_HAMMING;
         default:
 #ifdef SK_HIGH_QUALITY_IS_LANCZOS
             return SkBitmapScaler::RESIZE_LANCZOS3;
 #else
             return SkBitmapScaler::RESIZE_MITCHELL;
 #endif
     }
 }
 
-static bool resize(const SkPixmap& pmap, SkBitmap* resultPtr, SkBitmapScaler::ResizeMethod method,
-                   float destWidth, float destHeight, SkBitmap::Allocator* allocator,
-                   const SkConvolutionProcs& convolveProcs) {
-    const SkRect destSubset = SkRect::MakeWH(destWidth, destHeight);
-    SkResizeFilter filter(method, pmap.width(), pmap.height(),
-                          destWidth, destHeight, destSubset, convolveProcs);
-
-    // Get a source bitmap encompassing this touched area. We construct the
-    // offsets and row strides such that it looks like a new bitmap, while
-    // referring to the old data.
-    const uint8_t* sourceSubset = reinterpret_cast<const uint8_t*>(pmap.addr());
-
-    // Convolve into the result.
-    SkBitmap result;
-    result.setInfo(SkImageInfo::MakeN32(SkScalarCeilToInt(destSubset.width()),
-                                        SkScalarCeilToInt(destSubset.height()),
-                                        pmap.alphaType()));
-    result.allocPixels(allocator, NULL);
-    if (!result.readyToDraw()) {
-        return false;
-    }
-
-    BGRAConvolve2D(sourceSubset, static_cast<int>(pmap.rowBytes()),
-                   !pmap.isOpaque(), filter.xFilter(), filter.yFilter(),
-                   static_cast<int>(result.rowBytes()),
-                   static_cast<unsigned char*>(result.getPixels()),
-                   convolveProcs, true);
-
-    *resultPtr = result;
-    resultPtr->lockPixels();
-    SkASSERT(resultPtr->getPixels());
-    return true;
-}
-
+// static
 bool SkBitmapScaler::Resize(SkBitmap* resultPtr,
                             const SkBitmap& source,
                             ResizeMethod method,
                             float destWidth, float destHeight,
                             SkBitmap::Allocator* allocator) {
-    if (source.colorType() != kN32_SkColorType) {
-        return false;
-    }
 
-    SkConvolutionProcs convolveProcs= { 0, NULL, NULL, NULL, NULL };
-    PlatformConvolutionProcs(&convolveProcs);
+  SkConvolutionProcs convolveProcs= { 0, NULL, NULL, NULL, NULL };
+  PlatformConvolutionProcs(&convolveProcs);
 
-    // Ensure that the ResizeMethod enumeration is sound.
-    SkASSERT(((RESIZE_FIRST_QUALITY_METHOD <= method) &&
+  SkRect destSubset = { 0, 0, destWidth, destHeight };
+
+  // Ensure that the ResizeMethod enumeration is sound.
+  SkASSERT(((RESIZE_FIRST_QUALITY_METHOD <= method) &&
       (method <= RESIZE_LAST_QUALITY_METHOD)) ||
       ((RESIZE_FIRST_ALGORITHM_METHOD <= method) &&
       (method <= RESIZE_LAST_ALGORITHM_METHOD)));
 
-    // If the size of source or destination is 0, i.e. 0x0, 0xN or Nx0, just
-    // return empty.
-    if (source.width() < 1 || source.height() < 1 || destWidth < 1 || destHeight < 1) {
-        // todo: seems like we could handle negative dstWidth/Height, since that
-        // is just a negative scale (flip)
-        return false;
-    }
+  // If the size of source or destination is 0, i.e. 0x0, 0xN or Nx0, just
+  // return empty.
+  if (source.width() < 1 || source.height() < 1 ||
+      destWidth < 1 || destHeight < 1) {
+      // todo: seems like we could handle negative dstWidth/Height, since that
+      // is just a negative scale (flip)
+      return false;
+  }
 
-    method = ResizeMethodToAlgorithmMethod(method);
+  method = ResizeMethodToAlgorithmMethod(method);
 
-    // Check that we deal with an "algorithm methods" from this point onward.
-    SkASSERT((SkBitmapScaler::RESIZE_FIRST_ALGORITHM_METHOD <= method) &&
+  // Check that we deal with an "algorithm methods" from this point onward.
+  SkASSERT((SkBitmapScaler::RESIZE_FIRST_ALGORITHM_METHOD <= method) &&
       (method <= SkBitmapScaler::RESIZE_LAST_ALGORITHM_METHOD));
 
-    SkAutoPixmapUnlock result;
-    if (!source.requestLock(&result)) {
-        return false;
-    }
-    return resize(result.pixmap(), resultPtr, method, destWidth, destHeight, allocator,
-                  convolveProcs);
+  SkAutoLockPixels locker(source);
+  if (!source.readyToDraw() ||
+      source.colorType() != kN32_SkColorType) {
+      return false;
+  }
+
+  SkResizeFilter filter(method, source.width(), source.height(),
+                        destWidth, destHeight, destSubset, convolveProcs);
+
+  // Get a source bitmap encompassing this touched area. We construct the
+  // offsets and row strides such that it looks like a new bitmap, while
+  // referring to the old data.
+  const unsigned char* sourceSubset =
+      reinterpret_cast<const unsigned char*>(source.getPixels());
+
+  // Convolve into the result.
+  SkBitmap result;
+  result.setInfo(SkImageInfo::MakeN32(SkScalarCeilToInt(destSubset.width()),
+                                      SkScalarCeilToInt(destSubset.height()),
+                                      source.alphaType()));
+  result.allocPixels(allocator, NULL);
+  if (!result.readyToDraw()) {
+      return false;
+  }
+
+  BGRAConvolve2D(sourceSubset, static_cast<int>(source.rowBytes()),
+      !source.isOpaque(), filter.xFilter(), filter.yFilter(),
+      static_cast<int>(result.rowBytes()),
+      static_cast<unsigned char*>(result.getPixels()),
+      convolveProcs, true);
+
+  *resultPtr = result;
+  resultPtr->lockPixels();
+  SkASSERT(resultPtr->getPixels());
+  return true;
 }
 
 // static -- simpler interface to the resizer; returns a default bitmap if scaling
 // fails for any reason.  This is the interface that Chrome expects.
 SkBitmap SkBitmapScaler::Resize(const SkBitmap& source,
                                 ResizeMethod method,
                                 float destWidth, float destHeight,
                                 SkBitmap::Allocator* allocator) {
   SkBitmap result;
   if (!Resize(&result, source, method, destWidth, destHeight, allocator)) {
     return SkBitmap();
   }
   return result;
 }