ARM Skia NEON patches - 18 - Preparation work for BitmapProcState

src/core/SkBitmapProcState_matrixProcs.cpp

 /* NEON optimized code (C) COPYRIGHT 2009 Motorola
  *
  * Use of this source code is governed by a BSD-style license that can be
  * found in the LICENSE file.
  */
 
 #include "SkBitmapProcState.h"
 #include "SkPerspIter.h"
 #include "SkShader.h"
 #include "SkUtils.h"
 #include "SkUtilsArm.h"
-
-// Helper to ensure that when we shift down, we do it w/o sign-extension
-// so the caller doesn't have to manually mask off the top 16 bits
-//
-static unsigned SK_USHIFT16(unsigned x) {
-    return x >> 16;
-}
+#include "SkBitmapProcState_utils.h"
 
 /*  returns 0...(n-1) given any x (positive or negative).
 
     As an example, if n (which is always positive) is 5...
 
           x: -8 -7 -6 -5 -4 -3 -2 -1  0  1  2  3  4  5  6  7  8
     returns:  2  3  4  0  1  2  3  4  0  1  2  3  4  0  1  2  3
  */
 static inline int sk_int_mod(int x, int n) {
     SkASSERT(n > 0);
     if ((unsigned)x >= (unsigned)n) {
         if (x < 0) {
             x = n + ~(~x % n);
         } else {
             x = x % n;
         }
     }
     return x;
 }
 
-/*
- *  The decal_ functions require that
- *  1. dx > 0
- *  2. [fx, fx+dx, fx+2dx, fx+3dx, ... fx+(count-1)dx] are all <= maxX
- *
- *  In addition, we use SkFractionalInt to keep more fractional precision than
- *  just SkFixed, so we will abort the decal_ call if dx is very small, since
- *  the decal_ function just operates on SkFixed. If that were changed, we could
- *  skip the very_small test here.
- */
-static inline bool can_truncate_to_fixed_for_decal(SkFractionalInt frX,
-                                                   SkFractionalInt frDx,
-                                                   int count, unsigned max) {
-    SkFixed dx = SkFractionalIntToFixed(frDx);
-
-    // if decal_ kept SkFractionalInt precision, this would just be dx <= 0
-    // I just made up the 1/256. Just don't want to perceive accumulated error
-    // if we truncate frDx and lose its low bits.
-    if (dx <= SK_Fixed1 / 256) {
-        return false;
-    }
-
-    // We cast to unsigned so we don't have to check for negative values, which
-    // will now appear as very large positive values, and thus fail our test!
-    SkFixed fx = SkFractionalIntToFixed(frX);
-    return (unsigned)SkFixedFloorToInt(fx) <= max &&
-           (unsigned)SkFixedFloorToInt(fx + dx * (count - 1)) < max;
-}
-
 void decal_nofilter_scale(uint32_t dst[], SkFixed fx, SkFixed dx, int count);
 void decal_filter_scale(uint32_t dst[], SkFixed fx, SkFixed dx, int count);
 
 // Compile neon code paths if needed
 #if !SK_ARM_NEON_IS_NONE
 
 // These are defined in src/opts/SkBitmapProcState_matrixProcs_neon.cpp
 extern const SkBitmapProcState::MatrixProc ClampX_ClampY_Procs_neon[];
 extern const SkBitmapProcState::MatrixProc RepeatX_RepeatY_Procs_neon[];
 
@@ skipping 434 matching lines @@
     {
         return SK_ARM_NEON_WRAP(RepeatX_RepeatY_Procs)[index];
     }
 
     fTileProcX = choose_tile_proc(fTileModeX);
     fTileProcY = choose_tile_proc(fTileModeY);
     fTileLowBitsProcX = choose_tile_lowbits_proc(fTileModeX);
     fTileLowBitsProcY = choose_tile_lowbits_proc(fTileModeY);
     return GeneralXY_Procs[index];
 }