Change prototypes to yuv_convert_simd_x86 yasm and equivalent C to portably sign extend int args

media/base/simd/convert_rgb_to_yuv_ssse3.asm

 ; 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.
 
 %include "third_party/x86inc/x86inc.asm"
 
 ;
 ; This file uses SSE, SSE2, SSE3, and SSSE3, which are supported by all ATOM
 ; processors.
 ;
@@ skipping 225 matching lines @@
   movd      xmm2, %4
   pavgb     %1, xmm2
 %endif
 %endmacro
 
 ;
 ; extern "C" void ConvertARGBToYUVRow_SSSE3(const uint8* argb,
 ;                                           uint8* y,
 ;                                           uint8* u,
 ;                                           uint8* v,
-;                                           int width);
+;                                           ptrdiff_t width);
 ;
 %define SYMBOL          ConvertARGBToYUVRow_SSSE3
 %define PIXELSIZE       4
 %define SUBSAMPLING     0
 %define LINE            0
 %include "convert_rgb_to_yuv_ssse3.inc"
 
 ;
 ; extern "C" void ConvertRGBToYUVRow_SSSE3(const uint8* rgb,
 ;                                          uint8* y,
 ;                                          uint8* u,
 ;                                          uint8* v,
-;                                          int width);
+;                                          ptrdiff_t width);
 ;
 %define SYMBOL          ConvertRGBToYUVRow_SSSE3
 %define PIXELSIZE       3
 %define SUBSAMPLING     0
 %define LINE            0
 %include "convert_rgb_to_yuv_ssse3.inc"
 
 ;
 ; extern "C" void ConvertARGBToYUVEven_SSSE3(const uint8* argb,
 ;                                            uint8* y,
 ;                                            uint8* u,
 ;                                            uint8* v,
-;                                            int width);
+;                                            ptrdiff_t width);
 ;
 %define SYMBOL          ConvertARGBToYUVEven_SSSE3
 %define PIXELSIZE       4
 %define SUBSAMPLING     1
 %define LINE            0
 %include "convert_rgb_to_yuv_ssse3.inc"
 
 ;
 ; extern "C" void ConvertARGBToYUVOdd_SSSE3(const uint8* argb,
 ;                                           uint8* y,
 ;                                           uint8* u,
 ;                                           uint8* v,
-;                                           int width);
+;                                           ptrdiff_t width);
 ;
 %define SYMBOL          ConvertARGBToYUVOdd_SSSE3
 %define PIXELSIZE       4
 %define SUBSAMPLING     1
 %define LINE            1
 %include "convert_rgb_to_yuv_ssse3.inc"
 
 ;
 ; extern "C" void ConvertRGBToYUVEven_SSSE3(const uint8* rgb,
 ;                                           uint8* y,
 ;                                           uint8* u,
 ;                                           uint8* v,
-;                                           int width);
+;                                           ptrdiff_t width);
 ;
 %define SYMBOL          ConvertRGBToYUVEven_SSSE3
 %define PIXELSIZE       3
 %define SUBSAMPLING     1
 %define LINE            0
 %include "convert_rgb_to_yuv_ssse3.inc"
 
 ;
 ; extern "C" void ConvertRGBToYUVOdd_SSSE3(const uint8* rgb,
 ;                                          uint8* y,
 ;                                          uint8* u,
 ;                                          uint8* v,
-;                                          int width);
+;                                          ptrdiff_t width);
 ;
 %define SYMBOL          ConvertRGBToYUVOdd_SSSE3
 %define PIXELSIZE       3
 %define SUBSAMPLING     1
 %define LINE            1
 %include "convert_rgb_to_yuv_ssse3.inc"