| |
| /* |
| * 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 "GrGLPath.h" |
| #include "GrGLPathRendering.h" |
| #include "GrGLGpu.h" |
| |
| namespace { |
| inline GrGLubyte verb_to_gl_path_cmd(SkPath::Verb verb) { |
| static const GrGLubyte gTable[] = { |
| GR_GL_MOVE_TO, |
| GR_GL_LINE_TO, |
| GR_GL_QUADRATIC_CURVE_TO, |
| GR_GL_CONIC_CURVE_TO, |
| GR_GL_CUBIC_CURVE_TO, |
| GR_GL_CLOSE_PATH, |
| }; |
| GR_STATIC_ASSERT(0 == SkPath::kMove_Verb); |
| GR_STATIC_ASSERT(1 == SkPath::kLine_Verb); |
| GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb); |
| GR_STATIC_ASSERT(3 == SkPath::kConic_Verb); |
| GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb); |
| GR_STATIC_ASSERT(5 == SkPath::kClose_Verb); |
| |
| SkASSERT(verb >= 0 && (size_t)verb < SK_ARRAY_COUNT(gTable)); |
| return gTable[verb]; |
| } |
| |
| #ifdef SK_DEBUG |
| inline int num_coords(SkPath::Verb verb) { |
| static const int gTable[] = { |
| 2, // move |
| 2, // line |
| 4, // quad |
| 5, // conic |
| 6, // cubic |
| 0, // close |
| }; |
| GR_STATIC_ASSERT(0 == SkPath::kMove_Verb); |
| GR_STATIC_ASSERT(1 == SkPath::kLine_Verb); |
| GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb); |
| GR_STATIC_ASSERT(3 == SkPath::kConic_Verb); |
| GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb); |
| GR_STATIC_ASSERT(5 == SkPath::kClose_Verb); |
| |
| SkASSERT(verb >= 0 && (size_t)verb < SK_ARRAY_COUNT(gTable)); |
| return gTable[verb]; |
| } |
| #endif |
| |
| inline GrGLenum join_to_gl_join(SkPaint::Join join) { |
| static GrGLenum gSkJoinsToGrGLJoins[] = { |
| GR_GL_MITER_REVERT, |
| GR_GL_ROUND, |
| GR_GL_BEVEL |
| }; |
| return gSkJoinsToGrGLJoins[join]; |
| GR_STATIC_ASSERT(0 == SkPaint::kMiter_Join); |
| GR_STATIC_ASSERT(1 == SkPaint::kRound_Join); |
| GR_STATIC_ASSERT(2 == SkPaint::kBevel_Join); |
| GR_STATIC_ASSERT(SK_ARRAY_COUNT(gSkJoinsToGrGLJoins) == SkPaint::kJoinCount); |
| } |
| |
| inline GrGLenum cap_to_gl_cap(SkPaint::Cap cap) { |
| static GrGLenum gSkCapsToGrGLCaps[] = { |
| GR_GL_FLAT, |
| GR_GL_ROUND, |
| GR_GL_SQUARE |
| }; |
| return gSkCapsToGrGLCaps[cap]; |
| GR_STATIC_ASSERT(0 == SkPaint::kButt_Cap); |
| GR_STATIC_ASSERT(1 == SkPaint::kRound_Cap); |
| GR_STATIC_ASSERT(2 == SkPaint::kSquare_Cap); |
| GR_STATIC_ASSERT(SK_ARRAY_COUNT(gSkCapsToGrGLCaps) == SkPaint::kCapCount); |
| } |
| |
| inline void points_to_coords(const SkPoint points[], size_t first_point, size_t amount, |
| GrGLfloat coords[]) { |
| for (size_t i = 0; i < amount; ++i) { |
| coords[i * 2] = SkScalarToFloat(points[first_point + i].fX); |
| coords[i * 2 + 1] = SkScalarToFloat(points[first_point + i].fY); |
| } |
| } |
| } |
| |
| static const bool kIsWrapped = false; // The constructor creates the GL path object. |
| |
| void GrGLPath::InitPathObject(GrGLGpu* gpu, |
| GrGLuint pathID, |
| const SkPath& skPath, |
| const SkStrokeRec& stroke) { |
| if (!skPath.isEmpty()) { |
| int verbCnt = skPath.countVerbs(); |
| int pointCnt = skPath.countPoints(); |
| int minCoordCnt = pointCnt * 2; |
| |
| SkSTArray<16, GrGLubyte, true> pathCommands(verbCnt); |
| SkSTArray<16, GrGLfloat, true> pathCoords(minCoordCnt); |
| |
| SkDEBUGCODE(int numCoords = 0); |
| |
| if ((skPath.getSegmentMasks() & SkPath::kConic_SegmentMask) == 0) { |
| // This branch does type punning, converting SkPoint* to GrGLfloat*. |
| SK_COMPILE_ASSERT(sizeof(SkPoint) == sizeof(GrGLfloat) * 2, sk_point_not_two_floats); |
| // This branch does not convert with SkScalarToFloat. |
| #ifndef SK_SCALAR_IS_FLOAT |
| #error Need SK_SCALAR_IS_FLOAT. |
| #endif |
| pathCommands.resize_back(verbCnt); |
| pathCoords.resize_back(minCoordCnt); |
| skPath.getPoints(reinterpret_cast<SkPoint*>(&pathCoords[0]), pointCnt); |
| skPath.getVerbs(&pathCommands[0], verbCnt); |
| for (int i = 0; i < verbCnt; ++i) { |
| SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]); |
| pathCommands[i] = verb_to_gl_path_cmd(v); |
| SkDEBUGCODE(numCoords += num_coords(v)); |
| } |
| } else { |
| SkPoint points[4]; |
| SkPath::RawIter iter(skPath); |
| SkPath::Verb verb; |
| while ((verb = iter.next(points)) != SkPath::kDone_Verb) { |
| pathCommands.push_back(verb_to_gl_path_cmd(verb)); |
| GrGLfloat coords[6]; |
| int coordsForVerb; |
| switch (verb) { |
| case SkPath::kMove_Verb: |
| points_to_coords(points, 0, 1, coords); |
| coordsForVerb = 2; |
| break; |
| case SkPath::kLine_Verb: |
| points_to_coords(points, 1, 1, coords); |
| coordsForVerb = 2; |
| break; |
| case SkPath::kConic_Verb: |
| points_to_coords(points, 1, 2, coords); |
| coords[4] = SkScalarToFloat(iter.conicWeight()); |
| coordsForVerb = 5; |
| break; |
| case SkPath::kQuad_Verb: |
| points_to_coords(points, 1, 2, coords); |
| coordsForVerb = 4; |
| break; |
| case SkPath::kCubic_Verb: |
| points_to_coords(points, 1, 3, coords); |
| coordsForVerb = 6; |
| break; |
| case SkPath::kClose_Verb: |
| continue; |
| default: |
| SkASSERT(false); // Not reached. |
| continue; |
| } |
| SkDEBUGCODE(numCoords += num_coords(verb)); |
| pathCoords.push_back_n(coordsForVerb, coords); |
| } |
| } |
| |
| SkASSERT(verbCnt == pathCommands.count()); |
| SkASSERT(numCoords == pathCoords.count()); |
| |
| GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, pathCommands.count(), &pathCommands[0], |
| pathCoords.count(), GR_GL_FLOAT, &pathCoords[0])); |
| } else { |
| GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, 0, NULL, 0, GR_GL_FLOAT, NULL)); |
| } |
| |
| if (stroke.needToApply()) { |
| SkASSERT(!stroke.isHairlineStyle()); |
| GR_GL_CALL(gpu->glInterface(), |
| PathParameterf(pathID, GR_GL_PATH_STROKE_WIDTH, SkScalarToFloat(stroke.getWidth()))); |
| GR_GL_CALL(gpu->glInterface(), |
| PathParameterf(pathID, GR_GL_PATH_MITER_LIMIT, SkScalarToFloat(stroke.getMiter()))); |
| GrGLenum join = join_to_gl_join(stroke.getJoin()); |
| GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_JOIN_STYLE, join)); |
| GrGLenum cap = cap_to_gl_cap(stroke.getCap()); |
| GR_GL_CALL(gpu->glInterface(), PathParameteri(pathID, GR_GL_PATH_END_CAPS, cap)); |
| } |
| } |
| |
| GrGLPath::GrGLPath(GrGLGpu* gpu, const SkPath& path, const SkStrokeRec& stroke) |
| : INHERITED(gpu, kIsWrapped, path, stroke), |
| fPathID(gpu->glPathRendering()->genPaths(1)) { |
| |
| InitPathObject(gpu, fPathID, fSkPath, stroke); |
| |
| if (stroke.needToApply()) { |
| // FIXME: try to account for stroking, without rasterizing the stroke. |
| fBounds.outset(stroke.getWidth(), stroke.getWidth()); |
| } |
| this->registerWithCache(); |
| } |
| |
| void GrGLPath::onRelease() { |
| if (0 != fPathID && !this->isWrapped()) { |
| static_cast<GrGLGpu*>(this->getGpu())->glPathRendering()->deletePaths(fPathID, 1); |
| fPathID = 0; |
| } |
| |
| INHERITED::onRelease(); |
| } |
| |
| void GrGLPath::onAbandon() { |
| fPathID = 0; |
| |
| INHERITED::onAbandon(); |
| } |