1 /*
2 * Copyright 2013 Google Inc.
3 *
4 * Use of this source code is governed by a BSD-style license that can be
5 * found in the LICENSE file.
6 */
7
8 #ifndef SkBitmapProcState_MatrixTemplates_DEFINED
9 #define SkBitmapProcState_MatrixTemplates_DEFINED
10
11 #include "SkMath.h"
12 #include "SkMathPriv.h"
13
14 template <typename TileProc, bool tryDecal>
NoFilterProc_Scale(const SkBitmapProcState & s,uint32_t xy[],int count,int x,int y)15 void NoFilterProc_Scale(const SkBitmapProcState& s, uint32_t xy[],
16 int count, int x, int y) {
17 SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
18 SkMatrix::kScale_Mask)) == 0);
19
20 // we store y, x, x, x, x, x
21
22 const unsigned maxX = s.fPixmap.width() - 1;
23 SkFractionalInt fx;
24 {
25 const SkBitmapProcStateAutoMapper mapper(s, x, y);
26 const unsigned maxY = s.fPixmap.height() - 1;
27 *xy++ = TileProc::Y(s, mapper.fixedY(), maxY);
28 fx = mapper.fractionalIntX();
29 }
30
31 if (0 == maxX) {
32 // all of the following X values must be 0
33 memset(xy, 0, count * sizeof(uint16_t));
34 return;
35 }
36
37 const SkFractionalInt dx = s.fInvSxFractionalInt;
38
39 if (tryDecal && can_truncate_to_fixed_for_decal(fx, dx, count, maxX)) {
40 decal_nofilter_scale(xy, SkFractionalIntToFixed(fx),
41 SkFractionalIntToFixed(dx), count);
42 } else {
43 int i;
44 for (i = (count >> 2); i > 0; --i) {
45 unsigned a, b;
46 a = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
47 b = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
48 #ifdef SK_CPU_BENDIAN
49 *xy++ = (a << 16) | b;
50 #else
51 *xy++ = (b << 16) | a;
52 #endif
53 a = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
54 b = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
55 #ifdef SK_CPU_BENDIAN
56 *xy++ = (a << 16) | b;
57 #else
58 *xy++ = (b << 16) | a;
59 #endif
60 }
61 uint16_t* xx = (uint16_t*)xy;
62 for (i = (count & 3); i > 0; --i) {
63 *xx++ = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
64 }
65 }
66 }
67
68 // note: we could special-case on a matrix which is skewed in X but not Y.
69 // this would require a more general setup thatn SCALE does, but could use
70 // SCALE's inner loop that only looks at dx
71
72 template <typename TileProc>
NoFilterProc_Affine(const SkBitmapProcState & s,uint32_t xy[],int count,int x,int y)73 void NoFilterProc_Affine(const SkBitmapProcState& s, uint32_t xy[],
74 int count, int x, int y) {
75 SkASSERT(s.fInvType & SkMatrix::kAffine_Mask);
76 SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
77 SkMatrix::kScale_Mask |
78 SkMatrix::kAffine_Mask)) == 0);
79
80 const SkBitmapProcStateAutoMapper mapper(s, x, y);
81
82 SkFractionalInt fx = mapper.fractionalIntX();
83 SkFractionalInt fy = mapper.fractionalIntY();
84 SkFractionalInt dx = s.fInvSxFractionalInt;
85 SkFractionalInt dy = s.fInvKyFractionalInt;
86 int maxX = s.fPixmap.width() - 1;
87 int maxY = s.fPixmap.height() - 1;
88
89 for (int i = count; i > 0; --i) {
90 *xy++ = (TileProc::Y(s, SkFractionalIntToFixed(fy), maxY) << 16) |
91 TileProc::X(s, SkFractionalIntToFixed(fx), maxX);
92 fx += dx; fy += dy;
93 }
94 }
95
96 template <typename TileProc>
NoFilterProc_Persp(const SkBitmapProcState & s,uint32_t * SK_RESTRICT xy,int count,int x,int y)97 void NoFilterProc_Persp(const SkBitmapProcState& s, uint32_t* SK_RESTRICT xy,
98 int count, int x, int y) {
99 SkASSERT(s.fInvType & SkMatrix::kPerspective_Mask);
100
101 int maxX = s.fPixmap.width() - 1;
102 int maxY = s.fPixmap.height() - 1;
103
104 SkPerspIter iter(s.fInvMatrix,
105 SkIntToScalar(x) + SK_ScalarHalf,
106 SkIntToScalar(y) + SK_ScalarHalf, count);
107
108 while ((count = iter.next()) != 0) {
109 const SkFixed* SK_RESTRICT srcXY = iter.getXY();
110 while (--count >= 0) {
111 *xy++ = (TileProc::Y(s, srcXY[1], maxY) << 16) |
112 TileProc::X(s, srcXY[0], maxX);
113 srcXY += 2;
114 }
115 }
116 }
117
118 #endif
119