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/*
* 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 "GrGpuGL.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,
0xFF, // conic
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(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_pts(SkPath::Verb verb) {
static const int gTable[] = {
1, // move
1, // line
2, // quad
2, // conic
3, // 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(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);
}
}
static const bool kIsWrapped = false; // The constructor creates the GL path object.
void GrGLPath::InitPathObject(GrGpuGL* gpu,
GrGLuint pathID,
const SkPath& skPath,
const SkStrokeRec& stroke) {
SkSTArray<16, GrGLubyte, true> pathCommands;
SkSTArray<16, SkPoint, true> pathPoints;
int verbCnt = skPath.countVerbs();
int pointCnt = skPath.countPoints();
pathCommands.resize_back(verbCnt);
pathPoints.resize_back(pointCnt);
// TODO: Direct access to path points since we could pass them on directly.
skPath.getPoints(&pathPoints[0], pointCnt);
skPath.getVerbs(&pathCommands[0], verbCnt);
SkDEBUGCODE(int numPts = 0);
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(numPts += num_pts(v));
}
SkASSERT(pathPoints.count() == numPts);
GR_GL_CALL(gpu->glInterface(),
PathCommands(pathID, verbCnt, &pathCommands[0],
2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
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_INITIAL_END_CAP, cap));
GR_GL_CALL(gpu->glInterface(),
PathParameteri(pathID, GR_GL_PATH_TERMINAL_END_CAP, cap));
}
}
GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path, const SkStrokeRec& stroke)
: INHERITED(gpu, kIsWrapped, path, stroke),
fPathID(gpu->glPathRendering()->genPaths(1)) {
SkASSERT(!path.isEmpty());
InitPathObject(gpu, fPathID, fSkPath, stroke);
if (stroke.needToApply()) {
// FIXME: try to account for stroking, without rasterizing the stroke.
fBounds.outset(stroke.getWidth(), stroke.getWidth());
}
}
GrGLPath::~GrGLPath() {
this->release();
}
void GrGLPath::onRelease() {
if (0 != fPathID && !this->isWrapped()) {
static_cast<GrGpuGL*>(this->getGpu())->glPathRendering()->deletePaths(fPathID, 1);
fPathID = 0;
}
INHERITED::onRelease();
}
void GrGLPath::onAbandon() {
fPathID = 0;
INHERITED::onAbandon();
}
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