[MIPS] Added MIPS DSPr2 optimization for BGRAConvolve2D routine

skia/ext/convolver.h

 // Copyright (c) 2012 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.
 
 #ifndef SKIA_EXT_CONVOLVER_H_
 #define SKIA_EXT_CONVOLVER_H_
 
 #include <cmath>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/cpu.h"
 #include "third_party/skia/include/core/SkSize.h"
 #include "third_party/skia/include/core/SkTypes.h"
 
 // We can build SSE2 optimized versions for all x86 CPUs
 // except when building for the IOS emulator.
 #if defined(ARCH_CPU_X86_FAMILY) && !defined(OS_IOS)
 #define SIMD_SSE2 1
 #define SIMD_PADDING 8  // 8 * int16
 #endif
 
+#if defined (ARCH_CPU_MIPS_FAMILY) && \
+defined(__mips_dsp) && (__mips_dsp_rev >= 2)
+#define SIMD_MIPS_DSPR2 1
+#endif
 // avoid confusion with Mac OS X's math library (Carbon)
 #if defined(__APPLE__)
 #undef FloatToFixed
 #undef FixedToFloat
 #endif
 
 namespace skia {
 
 // Represents a filter in one dimension. Each output pixel has one entry in this
 // object for the filter values contributing to it. You build up the filter
@@ skipping 182 matching lines @@
                                      const SkISize& image_size,
                                      unsigned char* output,
                                      int output_byte_row_stride,
                                      int output_channel_index,
                                      int output_channel_count,
                                      bool absolute_values);
 
 }  // namespace skia
 
 #endif  // SKIA_EXT_CONVOLVER_H_