src/third_party/skia/src/core/SkBitmapProcState_matrix.h

   1
   2 /*
   3  * Copyright 2011 Google Inc.
   4  *
   5  * Use of this source code is governed by a BSD-style license that can be
   6  * found in the LICENSE file.
   7  */
   8
   9 #include "SkMath.h"
  10 #include "SkMathPriv.h"
  11
  12 #define SCALE_FILTER_NAME       MAKENAME(_filter_scale)
  13 #define AFFINE_FILTER_NAME      MAKENAME(_filter_affine)
  14 #define PERSP_FILTER_NAME       MAKENAME(_filter_persp)
  15
  16 #define PACK_FILTER_X_NAME  MAKENAME(_pack_filter_x)
  17 #define PACK_FILTER_Y_NAME  MAKENAME(_pack_filter_y)
  18
  19 #ifndef PREAMBLE
  20     #define PREAMBLE(state)
  21     #define PREAMBLE_PARAM_X
  22     #define PREAMBLE_PARAM_Y
  23     #define PREAMBLE_ARG_X
  24     #define PREAMBLE_ARG_Y
  25 #endif
  26
  27 // declare functions externally to suppress warnings.
  28 void SCALE_FILTER_NAME(const SkBitmapProcState& s,
  29                               uint32_t xy[], int count, int x, int y);
  30 void AFFINE_FILTER_NAME(const SkBitmapProcState& s,
  31                                uint32_t xy[], int count, int x, int y);
  32 void PERSP_FILTER_NAME(const SkBitmapProcState& s,
  33                               uint32_t* SK_RESTRICT xy, int count,
  34                               int x, int y);
  35
  36 static inline uint32_t PACK_FILTER_Y_NAME(SkFixed f, unsigned max,
  37                                           SkFixed one PREAMBLE_PARAM_Y) {
  38     unsigned i = TILEY_PROCF(f, max);
  39     i = (i << 4) | TILEY_LOW_BITS(f, max);
  40     return (i << 14) | (TILEY_PROCF((f + one), max));
  41 }
  42
  43 static inline uint32_t PACK_FILTER_X_NAME(SkFixed f, unsigned max,
  44                                           SkFixed one PREAMBLE_PARAM_X) {
  45     unsigned i = TILEX_PROCF(f, max);
  46     i = (i << 4) | TILEX_LOW_BITS(f, max);
  47     return (i << 14) | (TILEX_PROCF((f + one), max));
  48 }
  49
  50 void SCALE_FILTER_NAME(const SkBitmapProcState& s,
  51                               uint32_t xy[], int count, int x, int y) {
  52     SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
  53                              SkMatrix::kScale_Mask)) == 0);
  54     SkASSERT(s.fInvKy == 0);
  55
  56     PREAMBLE(s);
  57
  58     const unsigned maxX = s.fBitmap->width() - 1;
  59     const SkFixed one = s.fFilterOneX;
  60     const SkFractionalInt dx = s.fInvSxFractionalInt;
  61     SkFractionalInt fx;
  62
  63     {
  64         SkPoint pt;
  65         s.fInvProc(s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
  66                                   SkIntToScalar(y) + SK_ScalarHalf, &pt);
  67         const SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
  68         const unsigned maxY = s.fBitmap->height() - 1;
  69         // compute our two Y values up front
  70         *xy++ = PACK_FILTER_Y_NAME(fy, maxY, s.fFilterOneY PREAMBLE_ARG_Y);
  71         // now initialize fx
  72         fx = SkScalarToFractionalInt(pt.fX) - (SkFixedToFractionalInt(one) >> 1);
  73     }
  74
  75 #ifdef CHECK_FOR_DECAL
  76     if (can_truncate_to_fixed_for_decal(fx, dx, count, maxX)) {
  77         decal_filter_scale(xy, SkFractionalIntToFixed(fx),
  78                            SkFractionalIntToFixed(dx), count);
  79     } else
  80 #endif
  81     {
  82         do {
  83             SkFixed fixedFx = SkFractionalIntToFixed(fx);
  84             *xy++ = PACK_FILTER_X_NAME(fixedFx, maxX, one PREAMBLE_ARG_X);
  85             fx += dx;
  86         } while (--count != 0);
  87     }
  88 }
  89
  90 void AFFINE_FILTER_NAME(const SkBitmapProcState& s,
  91                                uint32_t xy[], int count, int x, int y) {
  92     SkASSERT(s.fInvType & SkMatrix::kAffine_Mask);
  93     SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
  94                              SkMatrix::kScale_Mask |
  95                              SkMatrix::kAffine_Mask)) == 0);
  96
  97     PREAMBLE(s);
  98     SkPoint srcPt;
  99     s.fInvProc(s.fInvMatrix,
 100                SkIntToScalar(x) + SK_ScalarHalf,
 101                SkIntToScalar(y) + SK_ScalarHalf, &srcPt);
 102
 103     SkFixed oneX = s.fFilterOneX;
 104     SkFixed oneY = s.fFilterOneY;
 105     SkFixed fx = SkScalarToFixed(srcPt.fX) - (oneX >> 1);
 106     SkFixed fy = SkScalarToFixed(srcPt.fY) - (oneY >> 1);
 107     SkFixed dx = s.fInvSx;
 108     SkFixed dy = s.fInvKy;
 109     unsigned maxX = s.fBitmap->width() - 1;
 110     unsigned maxY = s.fBitmap->height() - 1;
 111
 112     do {
 113         *xy++ = PACK_FILTER_Y_NAME(fy, maxY, oneY PREAMBLE_ARG_Y);
 114         fy += dy;
 115         *xy++ = PACK_FILTER_X_NAME(fx, maxX, oneX PREAMBLE_ARG_X);
 116         fx += dx;
 117     } while (--count != 0);
 118 }
 119
 120 void PERSP_FILTER_NAME(const SkBitmapProcState& s,
 121                               uint32_t* SK_RESTRICT xy, int count,
 122                               int x, int y) {
 123     SkASSERT(s.fInvType & SkMatrix::kPerspective_Mask);
 124
 125     PREAMBLE(s);
 126     unsigned maxX = s.fBitmap->width() - 1;
 127     unsigned maxY = s.fBitmap->height() - 1;
 128     SkFixed oneX = s.fFilterOneX;
 129     SkFixed oneY = s.fFilterOneY;
 130
 131     SkPerspIter   iter(s.fInvMatrix,
 132                        SkIntToScalar(x) + SK_ScalarHalf,
 133                        SkIntToScalar(y) + SK_ScalarHalf, count);
 134
 135     while ((count = iter.next()) != 0) {
 136         const SkFixed* SK_RESTRICT srcXY = iter.getXY();
 137         do {
 138             *xy++ = PACK_FILTER_Y_NAME(srcXY[1] - (oneY >> 1), maxY,
 139                                        oneY PREAMBLE_ARG_Y);
 140             *xy++ = PACK_FILTER_X_NAME(srcXY[0] - (oneX >> 1), maxX,
 141                                        oneX PREAMBLE_ARG_X);
 142             srcXY += 2;
 143         } while (--count != 0);
 144     }
 145 }
 146
 147 #undef MAKENAME
 148 #undef TILEX_PROCF
 149 #undef TILEY_PROCF
 150 #ifdef CHECK_FOR_DECAL
 151     #undef CHECK_FOR_DECAL
 152 #endif
 153
 154 #undef SCALE_FILTER_NAME
 155 #undef AFFINE_FILTER_NAME
 156 #undef PERSP_FILTER_NAME
 157
 158 #undef PREAMBLE
 159 #undef PREAMBLE_PARAM_X
 160 #undef PREAMBLE_PARAM_Y
 161 #undef PREAMBLE_ARG_X
 162 #undef PREAMBLE_ARG_Y
 163
 164 #undef TILEX_LOW_BITS
 165 #undef TILEY_LOW_BITS