1 /*
2 * Copyright 2011 The Android Open Source Project
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
9 #ifndef SkScan_DEFINED
10 #define SkScan_DEFINED
11
12 #include "SkFixed.h"
13 #include "SkRect.h"
14 #include <atomic>
15
16 class SkRasterClip;
17 class SkRegion;
18 class SkBlitter;
19 class SkPath;
20
21 /** Defines a fixed-point rectangle, identical to the integer SkIRect, but its
22 coordinates are treated as SkFixed rather than int32_t.
23 */
24 typedef SkIRect SkXRect;
25
26 extern std::atomic<bool> gSkUseDeltaAA;
27 extern std::atomic<bool> gSkForceDeltaAA;
28 extern std::atomic<bool> gSkUseAnalyticAA;
29 extern std::atomic<bool> gSkForceAnalyticAA;
30
31 class AdditiveBlitter;
32
33 class SkScan {
34 public:
35 /*
36 * Draws count-1 line segments, one at a time:
37 * line(pts[0], pts[1])
38 * line(pts[1], pts[2])
39 * line(......, pts[count - 1])
40 */
41 typedef void (*HairRgnProc)(const SkPoint[], int count, const SkRegion*, SkBlitter*);
42 typedef void (*HairRCProc)(const SkPoint[], int count, const SkRasterClip&, SkBlitter*);
43
44 static void FillPath(const SkPath&, const SkIRect&, SkBlitter*);
45
46 ///////////////////////////////////////////////////////////////////////////
47 // rasterclip
48
49 static void FillIRect(const SkIRect&, const SkRasterClip&, SkBlitter*);
50 static void FillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*);
51 static void FillRect(const SkRect&, const SkRasterClip&, SkBlitter*);
52 static void AntiFillRect(const SkRect&, const SkRasterClip&, SkBlitter*);
53 static void AntiFillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*);
54 static void FillPath(const SkPath&, const SkRasterClip&, SkBlitter*);
55 static void AntiFillPath(const SkPath&, const SkRasterClip&, SkBlitter*, bool forceDAA);
56 static void FrameRect(const SkRect&, const SkPoint& strokeSize,
57 const SkRasterClip&, SkBlitter*);
58 static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize,
59 const SkRasterClip&, SkBlitter*);
60 static void FillTriangle(const SkPoint pts[], const SkRasterClip&, SkBlitter*);
61 static void HairLine(const SkPoint[], int count, const SkRasterClip&, SkBlitter*);
62 static void AntiHairLine(const SkPoint[], int count, const SkRasterClip&, SkBlitter*);
63 static void HairRect(const SkRect&, const SkRasterClip&, SkBlitter*);
64 static void AntiHairRect(const SkRect&, const SkRasterClip&, SkBlitter*);
65 static void HairPath(const SkPath&, const SkRasterClip&, SkBlitter*);
66 static void AntiHairPath(const SkPath&, const SkRasterClip&, SkBlitter*);
67 static void HairSquarePath(const SkPath&, const SkRasterClip&, SkBlitter*);
68 static void AntiHairSquarePath(const SkPath&, const SkRasterClip&, SkBlitter*);
69 static void HairRoundPath(const SkPath&, const SkRasterClip&, SkBlitter*);
70 static void AntiHairRoundPath(const SkPath&, const SkRasterClip&, SkBlitter*);
71
72 // Needed by do_fill_path in SkScanPriv.h
73 static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
74
AntiFillPath(const SkPath & path,const SkRasterClip & rc,SkBlitter * blitter)75 static void AntiFillPath(const SkPath& path, const SkRasterClip& rc, SkBlitter* blitter) {
76 AntiFillPath(path, rc, blitter, false);
77 }
78 private:
79 friend class SkAAClip;
80 friend class SkRegion;
81
82 static void FillIRect(const SkIRect&, const SkRegion* clip, SkBlitter*);
83 static void FillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*);
84 static void FillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
85 static void AntiFillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
86 static void AntiFillXRect(const SkXRect&, const SkRegion*, SkBlitter*);
87 static void AntiFillPath(const SkPath&, const SkRegion& clip, SkBlitter*,
88 bool forceRLE = false, bool forceDAA = false);
89 static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*);
90
91 static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize,
92 const SkRegion*, SkBlitter*);
93 static void HairLineRgn(const SkPoint[], int count, const SkRegion*, SkBlitter*);
94 static void AntiHairLineRgn(const SkPoint[], int count, const SkRegion*, SkBlitter*);
95 static void AAAFillPath(const SkPath& path, SkBlitter* blitter, const SkIRect& pathIR,
96 const SkIRect& clipBounds, bool forceRLE);
97 static void DAAFillPath(const SkPath& path, SkBlitter* blitter, const SkIRect& pathIR,
98 const SkIRect& clipBounds, bool forceRLE);
99 static void SAAFillPath(const SkPath& path, SkBlitter* blitter, const SkIRect& pathIR,
100 const SkIRect& clipBounds, bool forceRLE);
101 };
102
103 /** Assign an SkXRect from a SkIRect, by promoting the src rect's coordinates
104 from int to SkFixed. Does not check for overflow if the src coordinates
105 exceed 32K
106 */
XRect_set(SkXRect * xr,const SkIRect & src)107 static inline void XRect_set(SkXRect* xr, const SkIRect& src) {
108 xr->fLeft = SkIntToFixed(src.fLeft);
109 xr->fTop = SkIntToFixed(src.fTop);
110 xr->fRight = SkIntToFixed(src.fRight);
111 xr->fBottom = SkIntToFixed(src.fBottom);
112 }
113
114 /** Assign an SkXRect from a SkRect, by promoting the src rect's coordinates
115 from SkScalar to SkFixed. Does not check for overflow if the src coordinates
116 exceed 32K
117 */
XRect_set(SkXRect * xr,const SkRect & src)118 static inline void XRect_set(SkXRect* xr, const SkRect& src) {
119 xr->fLeft = SkScalarToFixed(src.fLeft);
120 xr->fTop = SkScalarToFixed(src.fTop);
121 xr->fRight = SkScalarToFixed(src.fRight);
122 xr->fBottom = SkScalarToFixed(src.fBottom);
123 }
124
125 /** Round the SkXRect coordinates, and store the result in the SkIRect.
126 */
XRect_round(const SkXRect & xr,SkIRect * dst)127 static inline void XRect_round(const SkXRect& xr, SkIRect* dst) {
128 dst->fLeft = SkFixedRoundToInt(xr.fLeft);
129 dst->fTop = SkFixedRoundToInt(xr.fTop);
130 dst->fRight = SkFixedRoundToInt(xr.fRight);
131 dst->fBottom = SkFixedRoundToInt(xr.fBottom);
132 }
133
134 /** Round the SkXRect coordinates out (i.e. use floor for left/top, and ceiling
135 for right/bottom), and store the result in the SkIRect.
136 */
XRect_roundOut(const SkXRect & xr,SkIRect * dst)137 static inline void XRect_roundOut(const SkXRect& xr, SkIRect* dst) {
138 dst->fLeft = SkFixedFloorToInt(xr.fLeft);
139 dst->fTop = SkFixedFloorToInt(xr.fTop);
140 dst->fRight = SkFixedCeilToInt(xr.fRight);
141 dst->fBottom = SkFixedCeilToInt(xr.fBottom);
142 }
143
144 #endif
145