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