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.fBitmap->width() - 1;
23 SkFractionalInt fx;
24 {
25 SkPoint pt;
26 s.fInvProc(s.fInvMatrix, SkIntToScalar(x) + SK_ScalarHalf,
27 SkIntToScalar(y) + SK_ScalarHalf, &pt);
28 fx = SkScalarToFractionalInt(pt.fY);
29 const unsigned maxY = s.fBitmap->height() - 1;
30 *xy++ = TileProc::Y(s, SkFractionalIntToFixed(fx), maxY);
31 fx = SkScalarToFractionalInt(pt.fX);
32 }
33
34 if (0 == maxX) {
35 // all of the following X values must be 0
36 memset(xy, 0, count * sizeof(uint16_t));
37 return;
38 }
39
40 const SkFractionalInt dx = s.fInvSxFractionalInt;
41
42 if (tryDecal && can_truncate_to_fixed_for_decal(fx, dx, count, maxX)) {
43 decal_nofilter_scale(xy, SkFractionalIntToFixed(fx),
44 SkFractionalIntToFixed(dx), count);
45 } else {
46 int i;
47 for (i = (count >> 2); i > 0; --i) {
48 unsigned a, b;
49 a = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
50 b = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
51 #ifdef SK_CPU_BENDIAN
52 *xy++ = (a << 16) | b;
53 #else
54 *xy++ = (b << 16) | a;
55 #endif
56 a = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
57 b = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
58 #ifdef SK_CPU_BENDIAN
59 *xy++ = (a << 16) | b;
60 #else
61 *xy++ = (b << 16) | a;
62 #endif
63 }
64 uint16_t* xx = (uint16_t*)xy;
65 for (i = (count & 3); i > 0; --i) {
66 *xx++ = TileProc::X(s, SkFractionalIntToFixed(fx), maxX); fx += dx;
67 }
68 }
69 }
70
71 // note: we could special-case on a matrix which is skewed in X but not Y.
72 // this would require a more general setup thatn SCALE does, but could use
73 // SCALE's inner loop that only looks at dx
74
75 template <typename TileProc>
NoFilterProc_Affine(const SkBitmapProcState & s,uint32_t xy[],int count,int x,int y)76 void NoFilterProc_Affine(const SkBitmapProcState& s, uint32_t xy[],
77 int count, int x, int y) {
78 SkASSERT(s.fInvType & SkMatrix::kAffine_Mask);
79 SkASSERT((s.fInvType & ~(SkMatrix::kTranslate_Mask |
80 SkMatrix::kScale_Mask |
81 SkMatrix::kAffine_Mask)) == 0);
82
83 SkPoint srcPt;
84 s.fInvProc(s.fInvMatrix,
85 SkIntToScalar(x) + SK_ScalarHalf,
86 SkIntToScalar(y) + SK_ScalarHalf, &srcPt);
87
88 SkFractionalInt fx = SkScalarToFractionalInt(srcPt.fX);
89 SkFractionalInt fy = SkScalarToFractionalInt(srcPt.fY);
90 SkFractionalInt dx = s.fInvSxFractionalInt;
91 SkFractionalInt dy = s.fInvKyFractionalInt;
92 int maxX = s.fBitmap->width() - 1;
93 int maxY = s.fBitmap->height() - 1;
94
95 for (int i = count; i > 0; --i) {
96 *xy++ = (TileProc::Y(s, SkFractionalIntToFixed(fy), maxY) << 16) |
97 TileProc::X(s, SkFractionalIntToFixed(fx), maxX);
98 fx += dx; fy += dy;
99 }
100 }
101
102 template <typename TileProc>
NoFilterProc_Persp(const SkBitmapProcState & s,uint32_t * SK_RESTRICT xy,int count,int x,int y)103 void NoFilterProc_Persp(const SkBitmapProcState& s, uint32_t* SK_RESTRICT xy,
104 int count, int x, int y) {
105 SkASSERT(s.fInvType & SkMatrix::kPerspective_Mask);
106
107 int maxX = s.fBitmap->width() - 1;
108 int maxY = s.fBitmap->height() - 1;
109
110 SkPerspIter iter(s.fInvMatrix,
111 SkIntToScalar(x) + SK_ScalarHalf,
112 SkIntToScalar(y) + SK_ScalarHalf, count);
113
114 while ((count = iter.next()) != 0) {
115 const SkFixed* SK_RESTRICT srcXY = iter.getXY();
116 while (--count >= 0) {
117 *xy++ = (TileProc::Y(s, srcXY[1], maxY) << 16) |
118 TileProc::X(s, srcXY[0], maxX);
119 srcXY += 2;
120 }
121 }
122 }
123
124 #endif
125