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1 /* | 1 /* |
2 * Copyright 2015 Google Inc. | 2 * Copyright 2015 Google Inc. |
3 * | 3 * |
4 * Use of this source code is governed by a BSD-style license that can be | 4 * Use of this source code is governed by a BSD-style license that can be |
5 * found in the LICENSE file. | 5 * found in the LICENSE file. |
6 */ | 6 */ |
7 | 7 |
8 #include "GrRectBatchFactory.h" | 8 #include "GrRectBatchFactory.h" |
9 | 9 |
10 #include "GrAAStrokeRectBatch.h" | 10 #include "GrAAStrokeRectBatch.h" |
11 | 11 |
12 #include "SkStrokeRec.h" | 12 #include "SkStrokeRec.h" |
13 | 13 |
14 namespace GrRectBatchFactory { | 14 namespace GrRectBatchFactory { |
15 | 15 |
16 GrDrawBatch* CreateAAStroke(GrColor color, | |
17 const SkMatrix& viewMatrix, | |
18 const SkRect& rect, | |
19 const SkRect& devRect, | |
20 const SkStrokeRec& stroke) { | |
21 SkVector devStrokeSize; | |
22 SkScalar width = stroke.getWidth(); | |
23 if (width > 0) { | |
24 devStrokeSize.set(width, width); | |
25 viewMatrix.mapVectors(&devStrokeSize, 1); | |
26 devStrokeSize.setAbs(devStrokeSize); | |
27 } else { | |
28 devStrokeSize.set(SK_Scalar1, SK_Scalar1); | |
29 } | |
30 | |
31 const SkScalar dx = devStrokeSize.fX; | |
32 const SkScalar dy = devStrokeSize.fY; | |
33 const SkScalar rx = SkScalarMul(dx, SK_ScalarHalf); | |
34 const SkScalar ry = SkScalarMul(dy, SK_ScalarHalf); | |
35 | |
36 SkRect devOutside(devRect); | |
37 devOutside.outset(rx, ry); | |
38 | |
39 bool miterStroke = true; | |
40 // For hairlines, make bevel and round joins appear the same as mitered ones
. | |
41 // small miter limit means right angles show bevel... | |
42 if ((width > 0) && (stroke.getJoin() != SkPaint::kMiter_Join || | |
43 stroke.getMiter() < SK_ScalarSqrt2)) { | |
44 miterStroke = false; | |
45 } | |
46 | |
47 SkRect devInside(devRect); | |
48 devInside.inset(rx, ry); | |
49 | |
50 // If we have a degenerate stroking rect(ie the stroke is larger than inner
rect) then we | |
51 // make a degenerate inside rect to avoid double hitting. We will also jam
all of the points | |
52 // together when we render these rects. | |
53 SkScalar spare; | |
54 { | |
55 SkScalar w = devRect.width() - dx; | |
56 SkScalar h = devRect.height() - dy; | |
57 spare = SkTMin(w, h); | |
58 } | |
59 | |
60 bool degenerate = spare <= 0; | |
61 if (degenerate) { | |
62 devInside.fLeft = devInside.fRight = devRect.centerX(); | |
63 devInside.fTop = devInside.fBottom = devRect.centerY(); | |
64 } | |
65 | |
66 SkRect devOutsideAssist(devRect); | |
67 | |
68 // For bevel-stroke, use 2 SkRect instances(devOutside and devOutsideAssist) | |
69 // to draw the outer of the rect. Because there are 8 vertices on the outer | |
70 // edge, while vertex number of inner edge is 4, the same as miter-stroke. | |
71 if (!miterStroke) { | |
72 devOutside.inset(0, ry); | |
73 devOutsideAssist.outset(0, ry); | |
74 } | |
75 | |
76 return GrAAStrokeRectBatch::Create(color, viewMatrix, devOutside, devOutside
Assist, devInside, | |
77 miterStroke, degenerate); | |
78 } | |
79 | |
80 GrDrawBatch* CreateAAFillNestedRects(GrColor color, | 16 GrDrawBatch* CreateAAFillNestedRects(GrColor color, |
81 const SkMatrix& viewMatrix, | 17 const SkMatrix& viewMatrix, |
82 const SkRect rects[2]) { | 18 const SkRect rects[2]) { |
83 SkASSERT(viewMatrix.rectStaysRect()); | 19 SkASSERT(viewMatrix.rectStaysRect()); |
84 SkASSERT(!rects[0].isEmpty() && !rects[1].isEmpty()); | 20 SkASSERT(!rects[0].isEmpty() && !rects[1].isEmpty()); |
85 | 21 |
86 SkRect devOutside, devInside; | 22 SkRect devOutside, devInside; |
87 viewMatrix.mapRect(&devOutside, rects[0]); | 23 viewMatrix.mapRect(&devOutside, rects[0]); |
88 viewMatrix.mapRect(&devInside, rects[1]); | 24 viewMatrix.mapRect(&devInside, rects[1]); |
89 | 25 |
90 return GrAAStrokeRectBatch::Create(color, viewMatrix, devOutside, devOutside
, devInside, true, | 26 return GrAAStrokeRectBatch::Create(color, viewMatrix, devOutside, devOutside
, devInside, true, |
91 devInside.isEmpty()); | 27 devInside.isEmpty()); |
92 } | 28 } |
93 | 29 |
94 }; | 30 }; |
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