1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
|
/*
* Copyright 2012 Google Inc.
*
* Use of this source code is governed by a BSD-style license that can be
* found in the LICENSE file.
*/
#include "SkTypes.h"
#if defined(SK_BUILD_FOR_WIN)
#include "SkDWriteGeometrySink.h"
#include "SkFloatUtils.h"
#include "SkPath.h"
#include <dwrite.h>
#include <d2d1.h>
SkDWriteGeometrySink::SkDWriteGeometrySink(SkPath* path) : fRefCount(1), fPath(path) { }
SkDWriteGeometrySink::~SkDWriteGeometrySink() { }
HRESULT STDMETHODCALLTYPE SkDWriteGeometrySink::QueryInterface(REFIID iid, void **object) {
if (nullptr == object) {
return E_INVALIDARG;
}
if (iid == __uuidof(IUnknown) || iid == __uuidof(IDWriteGeometrySink)) {
*object = static_cast<IDWriteGeometrySink*>(this);
this->AddRef();
return S_OK;
} else {
*object = nullptr;
return E_NOINTERFACE;
}
}
ULONG STDMETHODCALLTYPE SkDWriteGeometrySink::AddRef(void) {
return static_cast<ULONG>(InterlockedIncrement(&fRefCount));
}
ULONG STDMETHODCALLTYPE SkDWriteGeometrySink::Release(void) {
ULONG res = static_cast<ULONG>(InterlockedDecrement(&fRefCount));
if (0 == res) {
delete this;
}
return res;
}
void STDMETHODCALLTYPE SkDWriteGeometrySink::SetFillMode(D2D1_FILL_MODE fillMode) {
switch (fillMode) {
case D2D1_FILL_MODE_ALTERNATE:
fPath->setFillType(SkPath::kEvenOdd_FillType);
break;
case D2D1_FILL_MODE_WINDING:
fPath->setFillType(SkPath::kWinding_FillType);
break;
default:
SkDEBUGFAIL("Unknown D2D1_FILL_MODE.");
break;
}
}
void STDMETHODCALLTYPE SkDWriteGeometrySink::SetSegmentFlags(D2D1_PATH_SEGMENT vertexFlags) {
if (vertexFlags == D2D1_PATH_SEGMENT_NONE || vertexFlags == D2D1_PATH_SEGMENT_FORCE_ROUND_LINE_JOIN) {
SkDEBUGFAIL("Invalid D2D1_PATH_SEGMENT value.");
}
}
void STDMETHODCALLTYPE SkDWriteGeometrySink::BeginFigure(D2D1_POINT_2F startPoint, D2D1_FIGURE_BEGIN figureBegin) {
fPath->moveTo(startPoint.x, startPoint.y);
if (figureBegin == D2D1_FIGURE_BEGIN_HOLLOW) {
SkDEBUGFAIL("Invalid D2D1_FIGURE_BEGIN value.");
}
}
void STDMETHODCALLTYPE SkDWriteGeometrySink::AddLines(const D2D1_POINT_2F *points, UINT pointsCount) {
for (const D2D1_POINT_2F *end = &points[pointsCount]; points < end; ++points) {
fPath->lineTo(points->x, points->y);
}
}
static bool approximately_equal(float a, float b) {
const SkFloatingPoint<float, 10> lhs(a), rhs(b);
return lhs.AlmostEquals(rhs);
}
typedef struct {
float x;
float y;
} Cubic[4], Quadratic[3];
static bool check_quadratic(const Cubic& cubic, Quadratic& reduction) {
float dx10 = cubic[1].x - cubic[0].x;
float dx23 = cubic[2].x - cubic[3].x;
float midX = cubic[0].x + dx10 * 3 / 2;
//NOTE: !approximately_equal(midX - cubic[3].x, dx23 * 3 / 2)
//does not work as subnormals get in between the left side and 0.
if (!approximately_equal(midX, (dx23 * 3 / 2) + cubic[3].x)) {
return false;
}
float dy10 = cubic[1].y - cubic[0].y;
float dy23 = cubic[2].y - cubic[3].y;
float midY = cubic[0].y + dy10 * 3 / 2;
if (!approximately_equal(midY, (dy23 * 3 / 2) + cubic[3].y)) {
return false;
}
reduction[0] = cubic[0];
reduction[1].x = midX;
reduction[1].y = midY;
reduction[2] = cubic[3];
return true;
}
void STDMETHODCALLTYPE SkDWriteGeometrySink::AddBeziers(const D2D1_BEZIER_SEGMENT *beziers, UINT beziersCount) {
SkPoint lastPt;
fPath->getLastPt(&lastPt);
D2D1_POINT_2F prevPt = { SkScalarToFloat(lastPt.fX), SkScalarToFloat(lastPt.fY) };
for (const D2D1_BEZIER_SEGMENT *end = &beziers[beziersCount]; beziers < end; ++beziers) {
Cubic cubic = { { prevPt.x, prevPt.y },
{ beziers->point1.x, beziers->point1.y },
{ beziers->point2.x, beziers->point2.y },
{ beziers->point3.x, beziers->point3.y }, };
Quadratic quadratic;
if (check_quadratic(cubic, quadratic)) {
fPath->quadTo(quadratic[1].x, quadratic[1].y,
quadratic[2].x, quadratic[2].y);
} else {
fPath->cubicTo(beziers->point1.x, beziers->point1.y,
beziers->point2.x, beziers->point2.y,
beziers->point3.x, beziers->point3.y);
}
prevPt = beziers->point3;
}
}
void STDMETHODCALLTYPE SkDWriteGeometrySink::EndFigure(D2D1_FIGURE_END figureEnd) {
fPath->close();
}
HRESULT SkDWriteGeometrySink::Close() {
return S_OK;
}
HRESULT SkDWriteGeometrySink::Create(SkPath* path, IDWriteGeometrySink** geometryToPath) {
*geometryToPath = new SkDWriteGeometrySink(path);
return S_OK;
}
#endif//defined(SK_BUILD_FOR_WIN)
|
