1
2 /*
3 * Copyright 2012 Google Inc.
4 *
5 * Use of this source code is governed by a BSD-style license that can be
6 * found in the LICENSE file.
7 */
8
9 #include "GrGLPath.h"
10 #include "GrGpuGL.h"
11
12 #define GPUGL static_cast<GrGpuGL*>(this->getGpu())
13
14 #define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X)
15 #define GL_CALL_RET(R, X) GR_GL_CALL_RET(GPUGL->glInterface(), R, X)
16
17 namespace {
verb_to_gl_path_cmd(SkPath::Verb verb)18 inline GrGLubyte verb_to_gl_path_cmd(SkPath::Verb verb) {
19 static const GrGLubyte gTable[] = {
20 GR_GL_MOVE_TO,
21 GR_GL_LINE_TO,
22 GR_GL_QUADRATIC_CURVE_TO,
23 0xFF, // conic
24 GR_GL_CUBIC_CURVE_TO,
25 GR_GL_CLOSE_PATH,
26 };
27 GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
28 GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
29 GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
30 GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
31 GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
32
33 SkASSERT(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
34 return gTable[verb];
35 }
36
37 #ifdef SK_DEBUG
num_pts(SkPath::Verb verb)38 inline int num_pts(SkPath::Verb verb) {
39 static const int gTable[] = {
40 1, // move
41 1, // line
42 2, // quad
43 2, // conic
44 3, // cubic
45 0, // close
46 };
47 GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
48 GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
49 GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
50 GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
51 GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
52
53 SkASSERT(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
54 return gTable[verb];
55 }
56 #endif
57
join_to_gl_join(SkPaint::Join join)58 inline GrGLenum join_to_gl_join(SkPaint::Join join) {
59 static GrGLenum gSkJoinsToGrGLJoins[] = {
60 GR_GL_MITER_REVERT,
61 GR_GL_ROUND,
62 GR_GL_BEVEL
63 };
64 return gSkJoinsToGrGLJoins[join];
65 GR_STATIC_ASSERT(0 == SkPaint::kMiter_Join);
66 GR_STATIC_ASSERT(1 == SkPaint::kRound_Join);
67 GR_STATIC_ASSERT(2 == SkPaint::kBevel_Join);
68 GR_STATIC_ASSERT(GR_ARRAY_COUNT(gSkJoinsToGrGLJoins) == SkPaint::kJoinCount);
69 }
70
cap_to_gl_cap(SkPaint::Cap cap)71 inline GrGLenum cap_to_gl_cap(SkPaint::Cap cap) {
72 static GrGLenum gSkCapsToGrGLCaps[] = {
73 GR_GL_FLAT,
74 GR_GL_ROUND,
75 GR_GL_SQUARE
76 };
77 return gSkCapsToGrGLCaps[cap];
78 GR_STATIC_ASSERT(0 == SkPaint::kButt_Cap);
79 GR_STATIC_ASSERT(1 == SkPaint::kRound_Cap);
80 GR_STATIC_ASSERT(2 == SkPaint::kSquare_Cap);
81 GR_STATIC_ASSERT(GR_ARRAY_COUNT(gSkCapsToGrGLCaps) == SkPaint::kCapCount);
82 }
83
84 }
85
86 static const bool kIsWrapped = false; // The constructor creates the GL path object.
87
GrGLPath(GrGpuGL * gpu,const SkPath & path,const SkStrokeRec & stroke)88 GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path, const SkStrokeRec& stroke)
89 : INHERITED(gpu, kIsWrapped, path, stroke) {
90 #ifndef SK_SCALAR_IS_FLOAT
91 GrCrash("Assumes scalar is float.");
92 #endif
93 SkASSERT(!path.isEmpty());
94
95 GL_CALL_RET(fPathID, GenPaths(1));
96
97 SkSTArray<16, GrGLubyte, true> pathCommands;
98 SkSTArray<16, SkPoint, true> pathPoints;
99
100 int verbCnt = fSkPath.countVerbs();
101 int pointCnt = fSkPath.countPoints();
102 pathCommands.resize_back(verbCnt);
103 pathPoints.resize_back(pointCnt);
104
105 // TODO: Direct access to path points since we could pass them on directly.
106 fSkPath.getPoints(&pathPoints[0], pointCnt);
107 fSkPath.getVerbs(&pathCommands[0], verbCnt);
108
109 SkDEBUGCODE(int numPts = 0);
110 for (int i = 0; i < verbCnt; ++i) {
111 SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
112 pathCommands[i] = verb_to_gl_path_cmd(v);
113 SkDEBUGCODE(numPts += num_pts(v));
114 }
115 SkASSERT(pathPoints.count() == numPts);
116
117 GL_CALL(PathCommands(fPathID,
118 verbCnt, &pathCommands[0],
119 2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
120
121 if (stroke.needToApply()) {
122 GL_CALL(PathParameterf(fPathID, GR_GL_PATH_STROKE_WIDTH, SkScalarToFloat(stroke.getWidth())));
123 GL_CALL(PathParameterf(fPathID, GR_GL_PATH_MITER_LIMIT, SkScalarToFloat(stroke.getMiter())));
124 GrGLenum join = join_to_gl_join(stroke.getJoin());
125 GL_CALL(PathParameteri(fPathID, GR_GL_PATH_JOIN_STYLE, join));
126 GrGLenum cap = cap_to_gl_cap(stroke.getCap());
127 GL_CALL(PathParameteri(fPathID, GR_GL_PATH_INITIAL_END_CAP, cap));
128 GL_CALL(PathParameteri(fPathID, GR_GL_PATH_TERMINAL_END_CAP, cap));
129
130 // FIXME: try to account for stroking, without rasterizing the stroke.
131 fBounds.outset(SkScalarToFloat(stroke.getWidth()), SkScalarToFloat(stroke.getWidth()));
132 }
133 }
134
~GrGLPath()135 GrGLPath::~GrGLPath() {
136 this->release();
137 }
138
onRelease()139 void GrGLPath::onRelease() {
140 if (0 != fPathID && !this->isWrapped()) {
141 GL_CALL(DeletePaths(fPathID, 1));
142 fPathID = 0;
143 }
144
145 INHERITED::onRelease();
146 }
147
onAbandon()148 void GrGLPath::onAbandon() {
149 fPathID = 0;
150
151 INHERITED::onAbandon();
152 }
153