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 "include/core/SkRect.h"
13 #include "include/private/SkFixed.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> gSkUseAnalyticAA;
27 extern std::atomic<bool> gSkForceAnalyticAA;
28
29 class AdditiveBlitter;
30
31 class SkScan {
32 public:
33 /*
34 * Draws count-1 line segments, one at a time:
35 * line(pts[0], pts[1])
36 * line(pts[1], pts[2])
37 * line(......, pts[count - 1])
38 */
39 typedef void (*HairRgnProc)(const SkPoint[], int count, const SkRegion*, SkBlitter*);
40 typedef void (*HairRCProc)(const SkPoint[], int count, const SkRasterClip&, SkBlitter*);
41
42 static void FillPath(const SkPath&, const SkIRect&, SkBlitter*);
43
44 // Paths of a certain size cannot be anti-aliased unless externally tiled (handled by SkDraw).
45 // AA clipping doesn't do that, so it's better for the clip stack to adjust AA state early
46 // rather than clip to the internal limits of the blitter.
47 static bool DowngradeClipAA(const SkIRect& bounds);
48
49 ///////////////////////////////////////////////////////////////////////////
50 // rasterclip
51
52 static void FillIRect(const SkIRect&, const SkRasterClip&, SkBlitter*);
53 static void FillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*);
54 static void FillRect(const SkRect&, const SkRasterClip&, SkBlitter*);
55 static void AntiFillRect(const SkRect&, const SkRasterClip&, SkBlitter*);
56 static void AntiFillXRect(const SkXRect&, const SkRasterClip&, SkBlitter*);
57 static void FillPath(const SkPath&, const SkRasterClip&, SkBlitter*);
58 static void AntiFillPath(const SkPath&, const SkRasterClip&, SkBlitter*);
59 static void FrameRect(const SkRect&, const SkPoint& strokeSize,
60 const SkRasterClip&, SkBlitter*);
61 static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize,
62 const SkRasterClip&, SkBlitter*);
63 static void FillTriangle(const SkPoint pts[], const SkRasterClip&, SkBlitter*);
64 static void HairLine(const SkPoint[], int count, const SkRasterClip&, SkBlitter*);
65 static void AntiHairLine(const SkPoint[], int count, const SkRasterClip&, SkBlitter*);
66 static void HairRect(const SkRect&, const SkRasterClip&, SkBlitter*);
67 static void AntiHairRect(const SkRect&, const SkRasterClip&, SkBlitter*);
68 static void HairPath(const SkPath&, const SkRasterClip&, SkBlitter*);
69 static void AntiHairPath(const SkPath&, const SkRasterClip&, SkBlitter*);
70 static void HairSquarePath(const SkPath&, const SkRasterClip&, SkBlitter*);
71 static void AntiHairSquarePath(const SkPath&, const SkRasterClip&, SkBlitter*);
72 static void HairRoundPath(const SkPath&, const SkRasterClip&, SkBlitter*);
73 static void AntiHairRoundPath(const SkPath&, const SkRasterClip&, SkBlitter*);
74
75 // Needed by do_fill_path in SkScanPriv.h
76 static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
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*, bool forceRLE);
88 static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*);
89
90 static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize,
91 const SkRegion*, SkBlitter*);
92 static void HairLineRgn(const SkPoint[], int count, const SkRegion*, SkBlitter*);
93 static void AntiHairLineRgn(const SkPoint[], int count, const SkRegion*, SkBlitter*);
94 static void AAAFillPath(const SkPath& path, SkBlitter* blitter, const SkIRect& pathIR,
95 const SkIRect& clipBounds, bool forceRLE);
96 static void SAAFillPath(const SkPath& path, SkBlitter* blitter, const SkIRect& pathIR,
97 const SkIRect& clipBounds, bool forceRLE);
98 };
99
100 /** Assign an SkXRect from a SkIRect, by promoting the src rect's coordinates
101 from int to SkFixed. Does not check for overflow if the src coordinates
102 exceed 32K
103 */
XRect_set(SkXRect * xr,const SkIRect & src)104 static inline void XRect_set(SkXRect* xr, const SkIRect& src) {
105 xr->fLeft = SkIntToFixed(src.fLeft);
106 xr->fTop = SkIntToFixed(src.fTop);
107 xr->fRight = SkIntToFixed(src.fRight);
108 xr->fBottom = SkIntToFixed(src.fBottom);
109 }
110
111 /** Assign an SkXRect from a SkRect, by promoting the src rect's coordinates
112 from SkScalar to SkFixed. Does not check for overflow if the src coordinates
113 exceed 32K
114 */
XRect_set(SkXRect * xr,const SkRect & src)115 static inline void XRect_set(SkXRect* xr, const SkRect& src) {
116 xr->fLeft = SkScalarToFixed(src.fLeft);
117 xr->fTop = SkScalarToFixed(src.fTop);
118 xr->fRight = SkScalarToFixed(src.fRight);
119 xr->fBottom = SkScalarToFixed(src.fBottom);
120 }
121
122 /** Round the SkXRect coordinates, and store the result in the SkIRect.
123 */
XRect_round(const SkXRect & xr,SkIRect * dst)124 static inline void XRect_round(const SkXRect& xr, SkIRect* dst) {
125 dst->fLeft = SkFixedRoundToInt(xr.fLeft);
126 dst->fTop = SkFixedRoundToInt(xr.fTop);
127 dst->fRight = SkFixedRoundToInt(xr.fRight);
128 dst->fBottom = SkFixedRoundToInt(xr.fBottom);
129 }
130
131 /** Round the SkXRect coordinates out (i.e. use floor for left/top, and ceiling
132 for right/bottom), and store the result in the SkIRect.
133 */
XRect_roundOut(const SkXRect & xr,SkIRect * dst)134 static inline void XRect_roundOut(const SkXRect& xr, SkIRect* dst) {
135 dst->fLeft = SkFixedFloorToInt(xr.fLeft);
136 dst->fTop = SkFixedFloorToInt(xr.fTop);
137 dst->fRight = SkFixedCeilToInt(xr.fRight);
138 dst->fBottom = SkFixedCeilToInt(xr.fBottom);
139 }
140
141 #endif
142