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Implement conics for NVPR

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Implement conics for NVPR. Verified with currently disabled conicpaths
gm, produces mostly same shapes with nvprmsaa4 and msaa4.

BUG=skia:2033

Review URL: https://codereview.chromium.org/694503003
This commit is contained in:
kkinnunen 2014-11-19 22:49:03 -08:00 committed by Commit bot
parent ac1383db67
commit e097be50bd
2 changed files with 82 additions and 24 deletions
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1
src/gpu/gl/GrGLDefines.h
View File

@ -802,6 +802,7 @@
#define GR_GL_LINE_TO 0x04
#define GR_GL_QUADRATIC_CURVE_TO 0x0A
#define GR_GL_CUBIC_CURVE_TO 0x0C
#define GR_GL_CONIC_CURVE_TO 0x1A
// path parameters
#define GR_GL_PATH_STROKE_WIDTH 0x9075

99
src/gpu/gl/GrGLPath.cpp
View File

@ -16,13 +16,14 @@ inline GrGLubyte verb_to_gl_path_cmd(SkPath::Verb verb) {
GR_GL_MOVE_TO,
GR_GL_LINE_TO,
GR_GL_QUADRATIC_CURVE_TO,
0xFF, // conic
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);
@ -31,18 +32,19 @@ inline GrGLubyte verb_to_gl_path_cmd(SkPath::Verb verb) {
}
#ifdef SK_DEBUG
inline int num_pts(SkPath::Verb verb) {
inline int num_coords(SkPath::Verb verb) {
static const int gTable[] = {
1, // move
1, // line
2, // quad
2, // conic
3, // cubic
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);
@ -77,6 +79,13 @@ inline GrGLenum cap_to_gl_cap(SkPaint::Cap 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.
@ -86,29 +95,77 @@ void GrGLPath::InitPathObject(GrGpuGL* gpu,
const SkPath& skPath,
const SkStrokeRec& stroke) {
if (!skPath.isEmpty()) {
SkSTArray<16, GrGLubyte, true> pathCommands;
SkSTArray<16, SkPoint, true> pathPoints;
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);
pathPoints.resize_back(pointCnt);
// TODO: Direct access to path points since we could pass them on directly.
skPath.getPoints(&pathPoints[0], pointCnt);
pathCoords.resize_back(minCoordCnt);
skPath.getPoints(reinterpret_cast<SkPoint*>(&pathCoords[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));
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(pathPoints.count() == numPts);
GR_GL_CALL(gpu->glInterface(),
PathCommands(pathID, verbCnt, &pathCommands[0],
2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
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));
}