Use SkBitmapProcStateAutoMapper for filter samplers also

src/opts/SkBitmapProcState_matrix_neon.h

 /*
  * Copyright 2014 Google Inc.
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include <arm_neon.h>
 
 #define SCALE_NOFILTER_NAME     MAKENAME(_nofilter_scale)
@@ skipping 280 matching lines @@
     SkASSERT(s.fInvKy == 0);
 
     PREAMBLE(s);
 
     const unsigned maxX = s.fPixmap.width() - 1;
     const SkFixed one = s.fFilterOneX;
     const SkFractionalInt dx = s.fInvSxFractionalInt;
     SkFractionalInt fx;
 
     {
-        SkPoint pt;
-        s.fInvProc(s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
-                                 SkIntToScalar(y) + SK_ScalarHalf, &pt);
-        const SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
+        const SkBitmapProcStateAutoMapper mapper(s, x, y);
+        const SkFixed fy = SkFractionalIntToFixed(mapper.y());
         const unsigned maxY = s.fPixmap.height() - 1;
         // compute our two Y values up front
         *xy++ = PACK_FILTER_Y_NAME(fy, maxY, s.fFilterOneY PREAMBLE_ARG_Y);
         // now initialize fx
-        fx = SkScalarToFractionalInt(pt.fX) - (SkFixedToFractionalInt(one) >> 1);
+        fx = mapper.x();
     }
 
 #ifdef CHECK_FOR_DECAL
     // test if we don't need to apply the tile proc
     if (can_truncate_to_fixed_for_decal(fx, dx, count, maxX)) {
         decal_filter_scale_neon(xy, SkFractionalIntToFixed(fx),
                              SkFractionalIntToFixed(dx), count);
         return;
     }
 #endif
@@ skipping 30 matching lines @@
 }
 
 static void AFFINE_FILTER_NAME(const SkBitmapProcState& s,
                                uint32_t xy[], int count, int x, int y) {
     SkASSERT(s.fInvType & SkMatrix::kAffine_Mask);
     SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
                              SkMatrix::kScale_Mask |
                              SkMatrix::kAffine_Mask)) == 0);
 
     PREAMBLE(s);
-    SkPoint srcPt;
-    s.fInvProc(s.fInvMatrix,
-               SkIntToScalar(x) + SK_ScalarHalf,
-               SkIntToScalar(y) + SK_ScalarHalf, &srcPt);
+    const SkBitmapProcStateAutoMapper mapper(s, x, y);
 
     SkFixed oneX = s.fFilterOneX;
     SkFixed oneY = s.fFilterOneY;
-    SkFixed fx = SkScalarToFixed(srcPt.fX) - (oneX >> 1);
-    SkFixed fy = SkScalarToFixed(srcPt.fY) - (oneY >> 1);
+    SkFixed fx = SkFractionalIntToFixed(mapper.x());
+    SkFixed fy = SkFractionalIntToFixed(mapper.y());
     SkFixed dx = s.fInvSx;
     SkFixed dy = s.fInvKy;
     unsigned maxX = s.fPixmap.width() - 1;
     unsigned maxY = s.fPixmap.height() - 1;
 
     if (count >= 4) {
         int32x4_t wide_fy, wide_fx;
 
         wide_fx = vdupq_n_s32(fx);
         wide_fx = vsetq_lane_s32(fx+dx, wide_fx, 1);
@@ skipping 117 matching lines @@
 #undef PERSP_FILTER_NAME
 
 #undef PREAMBLE
 #undef PREAMBLE_PARAM_X
 #undef PREAMBLE_PARAM_Y
 #undef PREAMBLE_ARG_X
 #undef PREAMBLE_ARG_Y
 
 #undef TILEX_LOW_BITS
 #undef TILEY_LOW_BITS