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 "SkMathPriv.h"
10
11 #define SCALE_FILTER_NAME MAKENAME(_filter_DX_shaderproc)
12
13 // Can't be static in the general case because some of these implementations
14 // will be defined and referenced in different object files.
15 void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y,
16 DSTTYPE* SK_RESTRICT colors, int count);
17
SCALE_FILTER_NAME(const SkBitmapProcState & s,int x,int y,DSTTYPE * SK_RESTRICT colors,int count)18 void SCALE_FILTER_NAME(const SkBitmapProcState& s, int x, int y,
19 DSTTYPE* SK_RESTRICT colors, int count) {
20 SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
21 SkMatrix::kScale_Mask)) == 0);
22 SkASSERT(s.fInvKy == 0);
23 SkASSERT(count > 0 && colors != NULL);
24 SkASSERT(s.fFilterLevel != SkPaint::kNone_FilterLevel);
25 SkDEBUGCODE(CHECKSTATE(s);)
26
27 const unsigned maxX = s.fBitmap->width() - 1;
28 const SkFixed oneX = s.fFilterOneX;
29 const SkFixed dx = s.fInvSx;
30 SkFixed fx;
31 const SRCTYPE* SK_RESTRICT row0;
32 const SRCTYPE* SK_RESTRICT row1;
33 unsigned subY;
34
35 {
36 SkPoint pt;
37 s.fInvProc(s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
38 SkIntToScalar(y) + SK_ScalarHalf, &pt);
39 SkFixed fy = SkScalarToFixed(pt.fY) - (s.fFilterOneY >> 1);
40 const unsigned maxY = s.fBitmap->height() - 1;
41 // compute our two Y values up front
42 subY = TILEY_LOW_BITS(fy, maxY);
43 int y0 = TILEY_PROCF(fy, maxY);
44 int y1 = TILEY_PROCF((fy + s.fFilterOneY), maxY);
45
46 const char* SK_RESTRICT srcAddr = (const char*)s.fBitmap->getPixels();
47 size_t rb = s.fBitmap->rowBytes();
48 row0 = (const SRCTYPE*)(srcAddr + y0 * rb);
49 row1 = (const SRCTYPE*)(srcAddr + y1 * rb);
50 // now initialize fx
51 fx = SkScalarToFixed(pt.fX) - (oneX >> 1);
52 }
53
54 #ifdef PREAMBLE
55 PREAMBLE(s);
56 #endif
57
58 do {
59 unsigned subX = TILEX_LOW_BITS(fx, maxX);
60 unsigned x0 = TILEX_PROCF(fx, maxX);
61 unsigned x1 = TILEX_PROCF((fx + oneX), maxX);
62
63 FILTER_PROC(subX, subY,
64 SRC_TO_FILTER(row0[x0]),
65 SRC_TO_FILTER(row0[x1]),
66 SRC_TO_FILTER(row1[x0]),
67 SRC_TO_FILTER(row1[x1]),
68 colors);
69 colors += 1;
70
71 fx += dx;
72 } while (--count != 0);
73
74 #ifdef POSTAMBLE
75 POSTAMBLE(s);
76 #endif
77 }
78
79 ///////////////////////////////////////////////////////////////////////////////
80
81 #undef TILEX_PROCF
82 #undef TILEY_PROCF
83 #undef TILEX_LOW_BITS
84 #undef TILEY_LOW_BITS
85 #undef MAKENAME
86 #undef SRCTYPE
87 #undef DSTTYPE
88 #undef CHECKSTATE
89 #undef SRC_TO_FILTER
90 #undef FILTER_TO_DST
91 #undef PREAMBLE
92 #undef POSTAMBLE
93
94 #undef SCALE_FILTER_NAME
95