C++ SkPath::getPoints方法代码示例

static HB_Error getOutlinePoint(HB_Font hbFont, HB_Glyph glyph, int flags, hb_uint32 point, HB_Fixed* xPos, HB_Fixed* yPos, hb_uint32* resultingNumPoints)
{
    FontPlatformData* font = reinterpret_cast<FontPlatformData*>(hbFont->userData);
    SkPaint paint;

    if (flags & HB_ShaperFlag_UseDesignMetrics)
        return HB_Err_Invalid_Argument;  // This is requesting pre-hinted positions. We can't support this.

    font->setupPaint(&paint);
    paint.setTextEncoding(SkPaint::kGlyphID_TextEncoding);
    uint16_t glyph16 = glyph;
    SkPath path;
    paint.getTextPath(&glyph16, sizeof(glyph16), 0, 0, &path);
    int numPoints = path.getPoints(0, 0);
    if (point >= static_cast<unsigned>(numPoints))
        return HB_Err_Invalid_SubTable;
    SkPoint* points = reinterpret_cast<SkPoint*>(fastMalloc(sizeof(SkPoint) * (point + 1)));
    if (!points)
        return HB_Err_Invalid_SubTable;
    // Skia does let us get a single point from the path.
    path.getPoints(points, point + 1);
    *xPos = SkiaScalarToHarfbuzzFixed(points[point].fX);
    *yPos = SkiaScalarToHarfbuzzFixed(points[point].fY);
    *resultingNumPoints = numPoints;
    fastFree(points);

    return HB_Err_Ok;
}

static HB_Error getOutlinePoint(HB_Font hbFont, HB_Glyph glyph, int flags, hb_uint32 point,
        HB_Fixed* xPos, HB_Fixed* yPos, hb_uint32* resultingNumPoints)
{
    if (flags & HB_ShaperFlag_UseDesignMetrics)
        // This is requesting pre-hinted positions. We can't support this.
        return HB_Err_Invalid_Argument;

    SkPaint* paint = static_cast<SkPaint*>(hbFont->userData);
    paint->setTextEncoding(SkPaint::kGlyphID_TextEncoding);

    uint16_t glyph16 = glyph;
    SkPath path;
    paint->getTextPath(&glyph16, sizeof(glyph16), 0, 0, &path);
    uint32_t numPoints = path.getPoints(0, 0);
    if (point >= numPoints)
        return HB_Err_Invalid_SubTable;
    SkPoint* points = static_cast<SkPoint*>(malloc(sizeof(SkPoint) * (point + 1)));
    if (!points)
        return HB_Err_Invalid_SubTable;
    // Skia does let us get a single point from the path.
    path.getPoints(points, point + 1);
    *xPos = SkScalarToHBFixed(points[point].fX);
    *yPos = SkScalarToHBFixed(points[point].fY);
    *resultingNumPoints = numPoints;
    delete points;

    return HB_Err_Ok;
}

GrGLPath::GrGLPath(GrGpuGL* gpu, const SkPath& path) : INHERITED(gpu, kIsWrapped) {
#ifndef SK_SCALAR_IS_FLOAT
    GrCrash("Assumes scalar is float.");
#endif
    SkASSERT(!path.isEmpty());

    GL_CALL_RET(fPathID, GenPaths(1));

    SkSTArray<16, GrGLubyte, true> pathCommands;
    SkSTArray<16, SkPoint, true> pathPoints;

    int verbCnt = path.countVerbs();
    int pointCnt = path.countPoints();
    pathCommands.resize_back(verbCnt);
    pathPoints.resize_back(pointCnt);

    // TODO: Direct access to path points since we could pass them on directly.
    path.getPoints(&pathPoints[0], pointCnt);
    path.getVerbs(&pathCommands[0], verbCnt);

    GR_DEBUGCODE(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);
        GR_DEBUGCODE(numPts += num_pts(v));
    }
    GrAssert(pathPoints.count() == numPts);

    GL_CALL(PathCommands(fPathID,
                         verbCnt, &pathCommands[0],
                         2 * pointCnt, GR_GL_FLOAT, &pathPoints[0]));
    fBounds = path.getBounds();
}

static void show_fan(SkCanvas* canvas, const SkPath& path, SkScalar cx, SkScalar cy) {
    SkPaint paint;
    setGLFrame(&paint);

    canvas->drawPath(path, paint);

    SkPoint pts[256];
    int count = path.getPoints(pts, SK_ARRAY_COUNT(pts));
    for (int i = 0; i < count; ++i) {
        canvas->drawLine(pts[i].fX, pts[i].fY, cx, cy, paint);
    }
}

 static void draw_path(SkCanvas* canvas, const SkPaint& pathPaint,
                       const SkPath& path, const SkPaint& triPaint) {
     canvas->drawPath(path, pathPaint);
     
     int n = path.getPoints(NULL, 0);
     SkPoint* pts = new SkPoint[n];
     path.getPoints(pts, n);
     
     SkTDArray<SkPoint> triangles;
     if (SkConcaveToTriangles(n, pts, &triangles)) {
         canvas->drawVertices(SkCanvas::kTriangles_VertexMode,
                              triangles.count(), triangles.begin(), NULL,
                              NULL, NULL, NULL, 0, triPaint);
     }
     
     SkPaint paint;
     paint.setColor(SK_ColorGREEN);
     paint.setStrokeWidth(SkIntToScalar(4));
     canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts, paint);
     delete[] pts;
 }

void GrGLPath::InitPathObjectPathData(GrGLGpu* gpu,
                                      GrGLuint pathID,
                                      const SkPath& skPath) {
    SkASSERT(!skPath.isEmpty());

#ifdef SK_SCALAR_IS_FLOAT
    // This branch does type punning, converting SkPoint* to GrGLfloat*.
    if ((skPath.getSegmentMasks() & SkPath::kConic_SegmentMask) == 0) {
        int verbCnt = skPath.countVerbs();
        int pointCnt = skPath.countPoints();
        int coordCnt = pointCnt * 2;
        SkSTArray<16, GrGLubyte, true> pathCommands(verbCnt);
        SkSTArray<16, GrGLfloat, true> pathCoords(coordCnt);

        static_assert(sizeof(SkPoint) == sizeof(GrGLfloat) * 2, "sk_point_not_two_floats");

        pathCommands.resize_back(verbCnt);
        pathCoords.resize_back(coordCnt);
        skPath.getPoints(reinterpret_cast<SkPoint*>(&pathCoords[0]), pointCnt);
        skPath.getVerbs(&pathCommands[0], verbCnt);

        SkDEBUGCODE(int verbCoordCnt = 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(verbCoordCnt += num_coords(v));
        }
        SkASSERT(verbCnt == pathCommands.count());
        SkASSERT(verbCoordCnt == pathCoords.count());
        SkDEBUGCODE(verify_floats(&pathCoords[0], pathCoords.count()));
        GR_GL_CALL(gpu->glInterface(), PathCommands(pathID, pathCommands.count(), &pathCommands[0],
                                                    pathCoords.count(), GR_GL_FLOAT,
                                                    &pathCoords[0]));
        return;
    }
#endif
    SkAssertResult(init_path_object_for_general_path<false>(gpu, pathID, skPath));
}

static void draw_path(SkCanvas* canvas, const SkPath& path, const SkRect& rect,
                      SkPaint::Join join, int doFill) {
    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setStyle(doFill ? SkPaint::kStrokeAndFill_Style : SkPaint::kStroke_Style);

    paint.setColor(sk_tool_utils::color_to_565(SK_ColorGRAY));
    paint.setStrokeWidth(STROKE_WIDTH);
    paint.setStrokeJoin(join);
    canvas->drawRect(rect, paint);

    paint.setStyle(SkPaint::kStroke_Style);
    paint.setStrokeWidth(0);
    paint.setColor(SK_ColorRED);
    canvas->drawPath(path, paint);

    paint.setStrokeWidth(3);
    paint.setStrokeJoin(SkPaint::kMiter_Join);
    int n = path.countPoints();
    SkAutoTArray<SkPoint> points(n);
    path.getPoints(points.get(), n);
    canvas->drawPoints(SkCanvas::kPoints_PointMode, n, points.get(), paint);
}

 void draw_points(SkCanvas* canvas, const SkPath& path, SkColor color,
                  bool show_lines) {
     SkPaint paint;
     paint.setColor(color);
     paint.setAlpha(0x80);
     paint.setAntiAlias(true);
     int n = path.countPoints();
     SkAutoSTArray<32, SkPoint> pts(n);
     if (show_lines && fDrawTangents) {
         SkTArray<int> contourCounts;
         getContourCounts(path, &contourCounts);
         SkPoint* ptPtr = pts.get();
         for (int i = 0; i < contourCounts.count(); ++i) {
             int count = contourCounts[i];
             path.getPoints(ptPtr, count);
             canvas->drawPoints(SkCanvas::kPolygon_PointMode, count, ptPtr, paint);
             ptPtr += count;
         }
     } else {
         n = getOnCurvePoints(path, pts.get());
     }
     paint.setStrokeWidth(5);
     canvas->drawPoints(SkCanvas::kPoints_PointMode, n, pts.get(), paint);
 }

void GrGLPath::InitPathObject(GrGLGpu* gpu,
                              GrGLuint pathID,
                              const SkPath& skPath,
                              const GrStrokeInfo& stroke) {
    SkASSERT(!stroke.isDashed());
    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));
        GR_GL_CALL(gpu->glInterface(), PathParameterf(pathID, GR_GL_PATH_STROKE_BOUND, 0.02f));
    }
}

static int count_char_points(const SkPaint& paint, char c) {
    SkPath  path;

    paint.getTextPath(&c, 1, 0, 0, &path);
    return path.getPoints(NULL, 0);
}