1/* libs/graphics/sgl/SkScan.h
2**
3** Copyright 2006, The Android Open Source Project
4**
5** Licensed under the Apache License, Version 2.0 (the "License");
6** you may not use this file except in compliance with the License.
7** You may obtain a copy of the License at
8**
9**     http://www.apache.org/licenses/LICENSE-2.0
10**
11** Unless required by applicable law or agreed to in writing, software
12** distributed under the License is distributed on an "AS IS" BASIS,
13** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
14** See the License for the specific language governing permissions and
15** limitations under the License.
16*/
17
18#ifndef SkScan_DEFINED
19#define SkScan_DEFINED
20
21#include "SkRect.h"
22
23class SkRegion;
24class SkBlitter;
25class SkPath;
26
27/** Defines a fixed-point rectangle, identical to the integer SkIRect, but its
28    coordinates are treated as SkFixed rather than int32_t.
29*/
30typedef SkIRect SkXRect;
31
32class SkScan {
33public:
34    static void FillIRect(const SkIRect&, const SkRegion* clip, SkBlitter*);
35    static void FillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*);
36
37#ifdef SK_SCALAR_IS_FIXED
38    static void FillRect(const SkRect& rect, const SkRegion* clip,
39                         SkBlitter* blitter) {
40        SkScan::FillXRect(*(const SkXRect*)&rect, clip, blitter);
41    }
42#else
43    static void FillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
44#endif
45
46    static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*);
47    static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
48
49    static void FillTriangle(const SkPoint& a, const SkPoint& b,
50                             const SkPoint& c, const SkRegion* clip,
51                             SkBlitter* blitter) {
52        SkPoint pts[3];
53        pts[0] = a;
54        pts[1] = b;
55        pts[2] = c;
56        FillTriangle(pts, clip, blitter);
57    }
58
59    static void HairLine(const SkPoint&, const SkPoint&, const SkRegion* clip, SkBlitter*);
60    static void HairRect(const SkRect&, const SkRegion* clip, SkBlitter*);
61    static void HairPath(const SkPath&, const SkRegion* clip, SkBlitter*);
62
63    static void FrameRect(const SkRect&, SkScalar width, const SkRegion* clip, SkBlitter*);
64
65    static void AntiFillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*);
66#ifdef SK_SCALAR_IS_FIXED
67    static void AntiFillRect(const SkRect& rect, const SkRegion* clip,
68                         SkBlitter* blitter) {
69        SkScan::AntiFillXRect(*(const SkXRect*)&rect, clip, blitter);
70    }
71#else
72    static void AntiFillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
73#endif
74
75    static void AntiFillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
76
77    static void AntiHairLine(const SkPoint&, const SkPoint&, const SkRegion* clip, SkBlitter*);
78    static void AntiHairRect(const SkRect&, const SkRegion* clip, SkBlitter*);
79    static void AntiHairPath(const SkPath&, const SkRegion* clip, SkBlitter*);
80};
81
82/** Assign an SkXRect from a SkIRect, by promoting the src rect's coordinates
83    from int to SkFixed. Does not check for overflow if the src coordinates
84    exceed 32K
85*/
86static inline void XRect_set(SkXRect* xr, const SkIRect& src) {
87    xr->fLeft = SkIntToFixed(src.fLeft);
88    xr->fTop = SkIntToFixed(src.fTop);
89    xr->fRight = SkIntToFixed(src.fRight);
90    xr->fBottom = SkIntToFixed(src.fBottom);
91}
92
93/** Assign an SkXRect from a SkRect, by promoting the src rect's coordinates
94    from SkScalar to SkFixed. Does not check for overflow if the src coordinates
95    exceed 32K
96*/
97static inline void XRect_set(SkXRect* xr, const SkRect& src) {
98    xr->fLeft = SkScalarToFixed(src.fLeft);
99    xr->fTop = SkScalarToFixed(src.fTop);
100    xr->fRight = SkScalarToFixed(src.fRight);
101    xr->fBottom = SkScalarToFixed(src.fBottom);
102}
103
104/** Round the SkXRect coordinates, and store the result in the SkIRect.
105*/
106static inline void XRect_round(const SkXRect& xr, SkIRect* dst) {
107    dst->fLeft = SkFixedRound(xr.fLeft);
108    dst->fTop = SkFixedRound(xr.fTop);
109    dst->fRight = SkFixedRound(xr.fRight);
110    dst->fBottom = SkFixedRound(xr.fBottom);
111}
112
113/** Round the SkXRect coordinates out (i.e. use floor for left/top, and ceiling
114    for right/bottom), and store the result in the SkIRect.
115*/
116static inline void XRect_roundOut(const SkXRect& xr, SkIRect* dst) {
117    dst->fLeft = SkFixedFloor(xr.fLeft);
118    dst->fTop = SkFixedFloor(xr.fTop);
119    dst->fRight = SkFixedCeil(xr.fRight);
120    dst->fBottom = SkFixedCeil(xr.fBottom);
121}
122
123#endif
124