SIMD implementation of Convolver for Lanczos filter etc.

skia/ext/image_operations.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #define _USE_MATH_DEFINES
 #include <algorithm>
 #include <cmath>
 #include <limits>
 
 #include "skia/ext/image_operations.h"
 
 // TODO(pkasting): skia/ext should not depend on base/!
 #include "base/logging.h"
 #include "base/metrics/histogram.h"
 #include "base/stack_container.h"
 #include "base/time.h"
 #include "build/build_config.h"
 #include "skia/ext/convolver.h"
+#include "third_party/skia/include/core/SkColorPriv.h"
 #include "third_party/skia/include/core/SkBitmap.h"
 #include "third_party/skia/include/core/SkRect.h"
 #include "third_party/skia/include/core/SkFontHost.h"
-#include "third_party/skia/include/core/SkColorPriv.h"
 
 namespace skia {
 
 namespace {
 
 // Returns the ceiling/floor as an integer.
 inline int CeilInt(float val) {
   return static_cast<int>(ceil(val));
 }
 inline int FloorInt(float val) {
@@ skipping 276 matching lines @@
     // arbitrarily add this to the center of the filter array (this won't always
     // be the center of the filter function since it could get clipped on the
     // edges, but it doesn't matter enough to worry about that case).
     int16 leftovers = output->FloatToFixed(1.0f) - fixed_sum;
     fixed_filter_values[fixed_filter_values->size() / 2] += leftovers;
 
     // Now it's ready to go.
     output->AddFilter(src_begin, &fixed_filter_values[0],
                       static_cast<int>(fixed_filter_values->size()));
   }
+
+  output->PaddingForSIMD(8);
 }
 
 ImageOperations::ResizeMethod ResizeMethodToAlgorithmMethod(
     ImageOperations::ResizeMethod method) {
   // Convert any "Quality Method" into an "Algorithm Method"
   if (method >= ImageOperations::RESIZE_FIRST_ALGORITHM_METHOD &&
       method <= ImageOperations::RESIZE_LAST_ALGORITHM_METHOD) {
     return method;
   }
   // The call to ImageOperationsGtv::Resize() above took care of
@@ skipping 166 matching lines @@
   ResizeFilter filter(method, source.width(), source.height(),
                       dest_width, dest_height, dest_subset);
 
   // 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* source_subset =
       reinterpret_cast<const uint8*>(source.getPixels());
 
   // Convolve into the result.
+  base::CPU cpu;
   SkBitmap result;
   result.setConfig(SkBitmap::kARGB_8888_Config,
                    dest_subset.width(), dest_subset.height());
   result.allocPixels();
   BGRAConvolve2D(source_subset, static_cast<int>(source.rowBytes()),
                  !source.isOpaque(), filter.x_filter(), filter.y_filter(),
                  static_cast<int>(result.rowBytes()),
-                 static_cast<unsigned char*>(result.getPixels()));
+                 static_cast<unsigned char*>(result.getPixels()),
+                 cpu.has_sse2());
 
   // Preserve the "opaque" flag for use as an optimization later.
   result.setIsOpaque(source.isOpaque());
 
   base::TimeDelta delta = base::TimeTicks::Now() - resize_start;
   UMA_HISTOGRAM_TIMES("Image.ResampleMS", delta);
 
   return result;
 }
 
 // static
 SkBitmap ImageOperations::Resize(const SkBitmap& source,
                                  ResizeMethod method,
                                  int dest_width, int dest_height) {
   SkIRect dest_subset = { 0, 0, dest_width, dest_height };
   return Resize(source, method, dest_width, dest_height, dest_subset);
 }
 
 }  // namespace skia