michael@0: 
michael@0: /*
michael@0:  * Copyright 2012 Google Inc.
michael@0:  *
michael@0:  * Use of this source code is governed by a BSD-style license that can be
michael@0:  * found in the LICENSE file.
michael@0:  */
michael@0: 
michael@0: #include "GrGLPath.h"
michael@0: #include "GrGpuGL.h"
michael@0: 
michael@0: #define GPUGL static_cast<GrGpuGL*>(this->getGpu())
michael@0: 
michael@0: #define GL_CALL(X) GR_GL_CALL(GPUGL->glInterface(), X)
michael@0: #define GL_CALL_RET(R, X) GR_GL_CALL_RET(GPUGL->glInterface(), R, X)
michael@0: 
michael@0: namespace {
michael@0: inline GrGLubyte verb_to_gl_path_cmd(SkPath::Verb verb) {
michael@0:     static const GrGLubyte gTable[] = {
michael@0:         GR_GL_MOVE_TO,
michael@0:         GR_GL_LINE_TO,
michael@0:         GR_GL_QUADRATIC_CURVE_TO,
michael@0:         0xFF, // conic
michael@0:         GR_GL_CUBIC_CURVE_TO,
michael@0:         GR_GL_CLOSE_PATH,
michael@0:     };
michael@0:     GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
michael@0:     GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
michael@0:     GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
michael@0:     GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
michael@0:     GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
michael@0: 
michael@0:     SkASSERT(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
michael@0:     return gTable[verb];
michael@0: }
michael@0: 
michael@0: #ifdef SK_DEBUG
michael@0: inline int num_pts(SkPath::Verb verb) {
michael@0:     static const int gTable[] = {
michael@0:         1, // move
michael@0:         1, // line
michael@0:         2, // quad
michael@0:         2, // conic
michael@0:         3, // cubic
michael@0:         0, // close
michael@0:     };
michael@0:     GR_STATIC_ASSERT(0 == SkPath::kMove_Verb);
michael@0:     GR_STATIC_ASSERT(1 == SkPath::kLine_Verb);
michael@0:     GR_STATIC_ASSERT(2 == SkPath::kQuad_Verb);
michael@0:     GR_STATIC_ASSERT(4 == SkPath::kCubic_Verb);
michael@0:     GR_STATIC_ASSERT(5 == SkPath::kClose_Verb);
michael@0: 
michael@0:     SkASSERT(verb >= 0 && (size_t)verb < GR_ARRAY_COUNT(gTable));
michael@0:     return gTable[verb];
michael@0: }
michael@0: #endif
michael@0: 
michael@0: inline GrGLenum join_to_gl_join(SkPaint::Join join) {
michael@0:     static GrGLenum gSkJoinsToGrGLJoins[] = {
michael@0:         GR_GL_MITER_REVERT,
michael@0:         GR_GL_ROUND,
michael@0:         GR_GL_BEVEL
michael@0:     };
michael@0:     return gSkJoinsToGrGLJoins[join];
michael@0:     GR_STATIC_ASSERT(0 == SkPaint::kMiter_Join);
michael@0:     GR_STATIC_ASSERT(1 == SkPaint::kRound_Join);
michael@0:     GR_STATIC_ASSERT(2 == SkPaint::kBevel_Join);
michael@0:     GR_STATIC_ASSERT(GR_ARRAY_COUNT(gSkJoinsToGrGLJoins) == SkPaint::kJoinCount);
michael@0: }
michael@0: 
michael@0: inline GrGLenum cap_to_gl_cap(SkPaint::Cap cap) {
michael@0:     static GrGLenum gSkCapsToGrGLCaps[] = {
michael@0:         GR_GL_FLAT,
michael@0:         GR_GL_ROUND,
michael@0:         GR_GL_SQUARE
michael@0:     };
michael@0:     return gSkCapsToGrGLCaps[cap];
michael@0:     GR_STATIC_ASSERT(0 == SkPaint::kButt_Cap);
michael@0:     GR_STATIC_ASSERT(1 == SkPaint::kRound_Cap);
michael@0:     GR_STATIC_ASSERT(2 == SkPaint::kSquare_Cap);
michael@0:     GR_STATIC_ASSERT(GR_ARRAY_COUNT(gSkCapsToGrGLCaps) == SkPaint::kCapCount);
michael@0: }
michael@0: 
michael@0: }
michael@0: 
michael@0: static const bool kIsWrapped = false; // The constructor creates the GL path object.
michael@0: 
michael@0: GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path, const SkStrokeRec& stroke)
michael@0:     : INHERITED(gpu, kIsWrapped, path, stroke) {
michael@0:     SkASSERT(!path.isEmpty());
michael@0: 
michael@0:     GL_CALL_RET(fPathID, GenPaths(1));
michael@0: 
michael@0:     SkSTArray<16, GrGLubyte, true> pathCommands;
michael@0:     SkSTArray<16, SkPoint, true> pathPoints;
michael@0: 
michael@0:     int verbCnt = fSkPath.countVerbs();
michael@0:     int pointCnt = fSkPath.countPoints();
michael@0:     pathCommands.resize_back(verbCnt);
michael@0:     pathPoints.resize_back(pointCnt);
michael@0: 
michael@0:     // TODO: Direct access to path points since we could pass them on directly.
michael@0:     fSkPath.getPoints(&pathPoints[0], pointCnt);
michael@0:     fSkPath.getVerbs(&pathCommands[0], verbCnt);
michael@0: 
michael@0:     SkDEBUGCODE(int numPts = 0);
michael@0:     for (int i = 0; i < verbCnt; ++i) {
michael@0:         SkPath::Verb v = static_cast<SkPath::Verb>(pathCommands[i]);
michael@0:         pathCommands[i] = verb_to_gl_path_cmd(v);
michael@0:         SkDEBUGCODE(numPts += num_pts(v));
michael@0:     }
michael@0:     SkASSERT(pathPoints.count() == numPts);
michael@0: 
michael@0:     GL_CALL(PathCommands(fPathID,
michael@0:                          verbCnt, &pathCommands[0],
michael@0:                          2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
michael@0: 
michael@0:     if (stroke.needToApply()) {
michael@0:         GL_CALL(PathParameterf(fPathID, GR_GL_PATH_STROKE_WIDTH, SkScalarToFloat(stroke.getWidth())));
michael@0:         GL_CALL(PathParameterf(fPathID, GR_GL_PATH_MITER_LIMIT, SkScalarToFloat(stroke.getMiter())));
michael@0:         GrGLenum join = join_to_gl_join(stroke.getJoin());
michael@0:         GL_CALL(PathParameteri(fPathID, GR_GL_PATH_JOIN_STYLE, join));
michael@0:         GrGLenum cap = cap_to_gl_cap(stroke.getCap());
michael@0:         GL_CALL(PathParameteri(fPathID, GR_GL_PATH_INITIAL_END_CAP, cap));
michael@0:         GL_CALL(PathParameteri(fPathID, GR_GL_PATH_TERMINAL_END_CAP, cap));
michael@0: 
michael@0:         // FIXME: try to account for stroking, without rasterizing the stroke.
michael@0:         fBounds.outset(SkScalarToFloat(stroke.getWidth()), SkScalarToFloat(stroke.getWidth()));
michael@0:     }
michael@0: }
michael@0: 
michael@0: GrGLPath::~GrGLPath() {
michael@0:     this->release();
michael@0: }
michael@0: 
michael@0: void GrGLPath::onRelease() {
michael@0:     if (0 != fPathID && !this->isWrapped()) {
michael@0:         GL_CALL(DeletePaths(fPathID, 1));
michael@0:         fPathID = 0;
michael@0:     }
michael@0: 
michael@0:     INHERITED::onRelease();
michael@0: }
michael@0: 
michael@0: void GrGLPath::onAbandon() {
michael@0:     fPathID = 0;
michael@0: 
michael@0:     INHERITED::onAbandon();
michael@0: }