1 /* libs/graphics/sgl/SkScan.h
2 **
3 ** Copyright 2011, 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
23 class SkRegion;
24 class SkBlitter;
25 class 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 */
30 typedef SkIRect SkXRect;
31
32 class SkScan {
33 public:
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
FillRect(const SkRect & rect,const SkRegion * clip,SkBlitter * blitter)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 static void FillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
46
47 static void FillTriangle(const SkPoint pts[], const SkRegion*, SkBlitter*);
FillTriangle(const SkPoint & a,const SkPoint & b,const SkPoint & c,const SkRegion * clip,SkBlitter * blitter)48 static void FillTriangle(const SkPoint& a, const SkPoint& b,
49 const SkPoint& c, const SkRegion* clip,
50 SkBlitter* blitter) {
51 SkPoint pts[3];
52 pts[0] = a;
53 pts[1] = b;
54 pts[2] = c;
55 FillTriangle(pts, clip, blitter);
56 }
57
58 static void HairLine(const SkPoint&, const SkPoint&, const SkRegion*,
59 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 AntiFillXRect(const SkXRect&, const SkRegion* clip, SkBlitter*);
64 #ifdef SK_SCALAR_IS_FIXED
AntiFillRect(const SkRect & rect,const SkRegion * clip,SkBlitter * blitter)65 static void AntiFillRect(const SkRect& rect, const SkRegion* clip,
66 SkBlitter* blitter) {
67 SkScan::AntiFillXRect(*(const SkXRect*)&rect, clip, blitter);
68 }
69 #else
70 static void AntiFillRect(const SkRect&, const SkRegion* clip, SkBlitter*);
71 #endif
72
73 static void AntiFillPath(const SkPath&, const SkRegion& clip, SkBlitter*);
74
75 static void AntiHairLine(const SkPoint&, const SkPoint&, const SkRegion*,
76 SkBlitter*);
77 static void AntiHairRect(const SkRect&, const SkRegion* clip, SkBlitter*);
78 static void AntiHairPath(const SkPath&, const SkRegion* clip, SkBlitter*);
79
80 // draws with a miter-join
81 static void FrameRect(const SkRect&, const SkPoint& strokeSize,
82 const SkRegion*, SkBlitter*);
83 static void AntiFrameRect(const SkRect&, const SkPoint& strokeSize,
84 const SkRegion*, SkBlitter*);
85 };
86
87 /** Assign an SkXRect from a SkIRect, by promoting the src rect's coordinates
88 from int to SkFixed. Does not check for overflow if the src coordinates
89 exceed 32K
90 */
XRect_set(SkXRect * xr,const SkIRect & src)91 static inline void XRect_set(SkXRect* xr, const SkIRect& src) {
92 xr->fLeft = SkIntToFixed(src.fLeft);
93 xr->fTop = SkIntToFixed(src.fTop);
94 xr->fRight = SkIntToFixed(src.fRight);
95 xr->fBottom = SkIntToFixed(src.fBottom);
96 }
97
98 /** Assign an SkXRect from a SkRect, by promoting the src rect's coordinates
99 from SkScalar to SkFixed. Does not check for overflow if the src coordinates
100 exceed 32K
101 */
XRect_set(SkXRect * xr,const SkRect & src)102 static inline void XRect_set(SkXRect* xr, const SkRect& src) {
103 xr->fLeft = SkScalarToFixed(src.fLeft);
104 xr->fTop = SkScalarToFixed(src.fTop);
105 xr->fRight = SkScalarToFixed(src.fRight);
106 xr->fBottom = SkScalarToFixed(src.fBottom);
107 }
108
109 /** Round the SkXRect coordinates, and store the result in the SkIRect.
110 */
XRect_round(const SkXRect & xr,SkIRect * dst)111 static inline void XRect_round(const SkXRect& xr, SkIRect* dst) {
112 dst->fLeft = SkFixedRound(xr.fLeft);
113 dst->fTop = SkFixedRound(xr.fTop);
114 dst->fRight = SkFixedRound(xr.fRight);
115 dst->fBottom = SkFixedRound(xr.fBottom);
116 }
117
118 /** Round the SkXRect coordinates out (i.e. use floor for left/top, and ceiling
119 for right/bottom), and store the result in the SkIRect.
120 */
XRect_roundOut(const SkXRect & xr,SkIRect * dst)121 static inline void XRect_roundOut(const SkXRect& xr, SkIRect* dst) {
122 dst->fLeft = SkFixedFloor(xr.fLeft);
123 dst->fTop = SkFixedFloor(xr.fTop);
124 dst->fRight = SkFixedCeil(xr.fRight);
125 dst->fBottom = SkFixedCeil(xr.fBottom);
126 }
127
128 #endif
129