C++ SkStrokeRec::getStyle方法代码示例

bool GrStyle::applyToPath(SkPath* dst, SkStrokeRec::InitStyle* style, const SkPath& src,
                          SkScalar resScale) const {
    SkASSERT(style);
    SkASSERT(dst);
    SkStrokeRec strokeRec = fStrokeRec;
    strokeRec.setResScale(resScale);
    const SkPath* pathForStrokeRec = &src;
    if (apply_path_effect(dst, &strokeRec, fPathEffect, src)) {
        pathForStrokeRec = dst;
    } else if (fPathEffect) {
        return false;
    }
    if (strokeRec.needToApply()) {
        if (!strokeRec.applyToPath(dst, *pathForStrokeRec)) {
            return false;
        }
        *style = SkStrokeRec::kFill_InitStyle;
    } else if (!fPathEffect) {
        // Nothing to do for path effect or stroke, fail.
        return false;
    } else {
        SkASSERT(SkStrokeRec::kFill_Style == strokeRec.getStyle() ||
                 SkStrokeRec::kHairline_Style == strokeRec.getStyle());
        *style = strokeRec.getStyle() == SkStrokeRec::kFill_Style
                 ? SkStrokeRec::kFill_InitStyle
                 : SkStrokeRec::kHairline_InitStyle;
    }
    return true;
}

bool GrAndroidPathRenderer::canDrawPath(const SkPath& path,
                                        const SkStrokeRec& stroke,
                                        const GrDrawTarget* target,
                                        bool antiAlias) const {
    return ((stroke.isFillStyle() || stroke.getStyle() == SkStrokeRec::kStroke_Style)
             && !path.isInverseFillType() && path.isConvex());
}

uint64_t GrPath::ComputeStrokeKey(const SkStrokeRec& stroke) {
    enum {
        kStyleBits = 2,
        kJoinBits = 2,
        kCapBits = 2,
        kWidthBits = 29,
        kMiterBits = 29,

        kJoinShift = kStyleBits,
        kCapShift = kJoinShift + kJoinBits,
        kWidthShift = kCapShift + kCapBits,
        kMiterShift = kWidthShift + kWidthBits,

        kBitCount = kMiterShift + kMiterBits
    };

    SK_COMPILE_ASSERT(SkStrokeRec::kStyleCount <= (1 << kStyleBits), style_shift_will_be_wrong);
    SK_COMPILE_ASSERT(SkPaint::kJoinCount <= (1 << kJoinBits), cap_shift_will_be_wrong);
    SK_COMPILE_ASSERT(SkPaint::kCapCount <= (1 << kCapBits), miter_shift_will_be_wrong);
    SK_COMPILE_ASSERT(kBitCount == 64, wrong_stroke_key_size);

    if (!stroke.needToApply()) {
        return SkStrokeRec::kFill_Style;
    }

    uint64_t key = stroke.getStyle();
    key |= stroke.getJoin() << kJoinShift;
    key |= stroke.getCap() << kCapShift;
    key |= get_top_n_float_bits<kWidthBits>(stroke.getWidth()) << kWidthShift;
    key |= get_top_n_float_bits<kMiterBits>(stroke.getMiter()) << kMiterShift;

    return key;
}

bool GrStrokePathRenderer::canDrawPath(const SkPath& path,
                                       const SkStrokeRec& stroke,
                                       const GrDrawTarget* target,
                                       bool antiAlias) const {
    // FIXME : put the proper condition once GrDrawTarget::isOpaque is implemented
    const bool isOpaque = true; // target->isOpaque();

    // FIXME : remove this requirement once we have AA circles and implement the
    //         circle joins/caps appropriately in the ::onDrawPath() function.
    const bool requiresAACircle = (stroke.getCap()  == SkPaint::kRound_Cap) ||
                                  (stroke.getJoin() == SkPaint::kRound_Join);

    // Indices being stored in uint16, we don't want to overflow the indices capacity
    static const int maxVBSize = 1 << 16;
    const int maxNbVerts = (path.countPoints() + 1) * 5;

    // Check that the path contains no curved lines, only straight lines
    static const uint32_t unsupportedMask = SkPath::kQuad_SegmentMask | SkPath::kCubic_SegmentMask;

    // Must not be filled nor hairline nor semi-transparent
    // Note : May require a check to path.isConvex() if AA is supported
    return ((stroke.getStyle() == SkStrokeRec::kStroke_Style) && (maxNbVerts < maxVBSize) &&
            !path.isInverseFillType() && isOpaque && !requiresAACircle && !antiAlias &&
            ((path.getSegmentMasks() & unsupportedMask) == 0));
}

// Allow all hairlines and all miters, so long as the miter limit doesn't produce beveled corners.
inline static bool allowed_stroke(const SkStrokeRec& stroke) {
    SkASSERT(stroke.getStyle() == SkStrokeRec::kStroke_Style ||
             stroke.getStyle() == SkStrokeRec::kHairline_Style);
    return !stroke.getWidth() ||
           (stroke.getJoin() == SkPaint::kMiter_Join && stroke.getMiter() > SK_ScalarSqrt2);
}

void GrStencilAndCoverTextContext::init(const GrPaint& paint,
                                        const SkPaint& skPaint,
                                        size_t textByteLength,
                                        RenderMode renderMode,
                                        SkScalar textTranslateY) {
    GrTextContext::init(paint, skPaint);

    fContextInitialMatrix = fContext->getMatrix();

    const bool otherBackendsWillDrawAsPaths =
        SkDraw::ShouldDrawTextAsPaths(skPaint, fContextInitialMatrix);

    fNeedsDeviceSpaceGlyphs = !otherBackendsWillDrawAsPaths &&
                              kMaxAccuracy_RenderMode == renderMode &&
                              SkToBool(fContextInitialMatrix.getType() &
                                       (SkMatrix::kScale_Mask | SkMatrix::kAffine_Mask));

    if (fNeedsDeviceSpaceGlyphs) {
        // SkDraw::ShouldDrawTextAsPaths takes care of perspective transforms.
        SkASSERT(!fContextInitialMatrix.hasPerspective());
        SkASSERT(0 == textTranslateY); // TODO: Handle textTranslateY in device-space usecase.

        fTextRatio = fTextInverseRatio = 1.0f;

        // Glyphs loaded by GPU path rendering have an inverted y-direction.
        SkMatrix m;
        m.setScale(1, -1);
        fContext->setMatrix(m);

        // Post-flip the initial matrix so we're left with just the flip after
        // the paint preConcats the inverse.
        m = fContextInitialMatrix;
        m.postScale(1, -1);
        fPaint.localCoordChangeInverse(m);

        // The whole shape (including stroke) will be baked into the glyph outlines. Make
        // NVPR just fill the baked shapes.
        fGlyphCache = fSkPaint.detachCache(&fDeviceProperties, &fContextInitialMatrix, false);
        fGlyphs = get_gr_glyphs(fContext, fGlyphCache->getScalerContext()->getTypeface(),
                                &fGlyphCache->getDescriptor(),
                                SkStrokeRec(SkStrokeRec::kFill_InitStyle));
    } else {
        // Don't bake strokes into the glyph outlines. We will stroke the glyphs
        // using the GPU instead. This is the fast path.
        SkStrokeRec gpuStroke = SkStrokeRec(fSkPaint);
        fSkPaint.setStyle(SkPaint::kFill_Style);

        if (gpuStroke.isHairlineStyle()) {
            // Approximate hairline stroke.
            SkScalar strokeWidth = SK_Scalar1 /
                (SkVector::Make(fContextInitialMatrix.getScaleX(),
                                fContextInitialMatrix.getSkewY()).length());
            gpuStroke.setStrokeStyle(strokeWidth, false /*strokeAndFill*/);

        } else if (fSkPaint.isFakeBoldText() &&
#ifdef SK_USE_FREETYPE_EMBOLDEN
                   kMaxPerformance_RenderMode == renderMode &&
#endif
                   SkStrokeRec::kStroke_Style != gpuStroke.getStyle()) {

            // Instead of baking fake bold into the glyph outlines, do it with the GPU stroke.
            SkScalar fakeBoldScale = SkScalarInterpFunc(fSkPaint.getTextSize(),
                                                        kStdFakeBoldInterpKeys,
                                                        kStdFakeBoldInterpValues,
                                                        kStdFakeBoldInterpLength);
            SkScalar extra = SkScalarMul(fSkPaint.getTextSize(), fakeBoldScale);
            gpuStroke.setStrokeStyle(gpuStroke.needToApply() ? gpuStroke.getWidth() + extra : extra,
                                     true /*strokeAndFill*/);

            fSkPaint.setFakeBoldText(false);
        }

        bool canUseRawPaths;

        if (otherBackendsWillDrawAsPaths || kMaxPerformance_RenderMode == renderMode) {
            // We can draw the glyphs from canonically sized paths.
            fTextRatio = fSkPaint.getTextSize() / SkPaint::kCanonicalTextSizeForPaths;
            fTextInverseRatio = SkPaint::kCanonicalTextSizeForPaths / fSkPaint.getTextSize();

            // Compensate for the glyphs being scaled by fTextRatio.
            if (!gpuStroke.isFillStyle()) {
                gpuStroke.setStrokeStyle(gpuStroke.getWidth() / fTextRatio,
                                         SkStrokeRec::kStrokeAndFill_Style == gpuStroke.getStyle());
            }

            fSkPaint.setLinearText(true);
            fSkPaint.setLCDRenderText(false);
            fSkPaint.setAutohinted(false);
            fSkPaint.setHinting(SkPaint::kNo_Hinting);
            fSkPaint.setSubpixelText(true);
            fSkPaint.setTextSize(SkIntToScalar(SkPaint::kCanonicalTextSizeForPaths));

            canUseRawPaths = SK_Scalar1 == fSkPaint.getTextScaleX() &&
                             0 == fSkPaint.getTextSkewX() &&
                             !fSkPaint.isFakeBoldText() &&
                             !fSkPaint.isVerticalText();
        } else {
            fTextRatio = fTextInverseRatio = 1.0f;
            canUseRawPaths = false;
        }
//.........这里部分代码省略.........