C++ (Cpp) AppendCubicの例

コード例 #1

ファイル: SkPDFUtils.cpp プロジェクト: ACSOP/android_external_skia

// static
void SkPDFUtils::EmitPath(const SkPath& path, SkWStream* content) {
    SkPoint args[4];
    SkPath::Iter iter(path, false);
    for (SkPath::Verb verb = iter.next(args);
         verb != SkPath::kDone_Verb;
         verb = iter.next(args)) {
        // args gets all the points, even the implicit first point.
        switch (verb) {
            case SkPath::kMove_Verb:
                MoveTo(args[0].fX, args[0].fY, content);
                break;
            case SkPath::kLine_Verb:
                AppendLine(args[1].fX, args[1].fY, content);
                break;
            case SkPath::kQuad_Verb: {
                // Convert quad to cubic (degree elevation). http://goo.gl/vS4i
                const SkScalar three = SkIntToScalar(3);
                args[1].scale(SkIntToScalar(2));
                SkScalar ctl1X = SkScalarDiv(args[0].fX + args[1].fX, three);
                SkScalar ctl1Y = SkScalarDiv(args[0].fY + args[1].fY, three);
                SkScalar ctl2X = SkScalarDiv(args[2].fX + args[1].fX, three);
                SkScalar ctl2Y = SkScalarDiv(args[2].fY + args[1].fY, three);
                AppendCubic(ctl1X, ctl1Y, ctl2X, ctl2Y, args[2].fX, args[2].fY,
                            content);
                break;
            }
            case SkPath::kCubic_Verb:
                AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
                            args[3].fX, args[3].fY, content);
                break;
            case SkPath::kClose_Verb:
                ClosePath(content);
                break;
            case SkPath::kDone_Verb:
                break;
            default:
                SkASSERT(false);
                break;
        }
    }
}

コード例 #2

ファイル: SkPDFUtils.cpp プロジェクト: 3rdexp/soui

// static
void SkPDFUtils::EmitPath(const SkPath& path, SkPaint::Style paintStyle,
                          SkWStream* content) {
    // Filling a path with no area results in a drawing in PDF renderers but
    // Chrome expects to be able to draw some such entities with no visible
    // result, so we detect those cases and discard the drawing for them.
    // Specifically: moveTo(X), lineTo(Y) and moveTo(X), lineTo(X), lineTo(Y).
    enum SkipFillState {
        kEmpty_SkipFillState         = 0,
        kSingleLine_SkipFillState    = 1,
        kNonSingleLine_SkipFillState = 2,
    };
    SkipFillState fillState = kEmpty_SkipFillState;
    if (paintStyle != SkPaint::kFill_Style) {
        fillState = kNonSingleLine_SkipFillState;
    }
    SkPoint lastMovePt = SkPoint::Make(0,0);
    SkDynamicMemoryWStream currentSegment;
    SkPoint args[4];
    SkPath::Iter iter(path, false);
    for (SkPath::Verb verb = iter.next(args);
         verb != SkPath::kDone_Verb;
         verb = iter.next(args)) {
        // args gets all the points, even the implicit first point.
        switch (verb) {
            case SkPath::kMove_Verb:
                MoveTo(args[0].fX, args[0].fY, &currentSegment);
                lastMovePt = args[0];
                fillState = kEmpty_SkipFillState;
                break;
            case SkPath::kLine_Verb:
                AppendLine(args[1].fX, args[1].fY, &currentSegment);
                if (fillState == kEmpty_SkipFillState) {
                   if (args[0] != lastMovePt) {
                       fillState = kSingleLine_SkipFillState;
                   }
                } else if (fillState == kSingleLine_SkipFillState) {
                    fillState = kNonSingleLine_SkipFillState;
                }
                break;
            case SkPath::kQuad_Verb: {
                SkPoint cubic[4];
                SkConvertQuadToCubic(args, cubic);
                AppendCubic(cubic[1].fX, cubic[1].fY, cubic[2].fX, cubic[2].fY,
                            cubic[3].fX, cubic[3].fY, &currentSegment);
                fillState = kNonSingleLine_SkipFillState;
                break;
            }
            case SkPath::kCubic_Verb:
                AppendCubic(args[1].fX, args[1].fY, args[2].fX, args[2].fY,
                            args[3].fX, args[3].fY, &currentSegment);
                fillState = kNonSingleLine_SkipFillState;
                break;
            case SkPath::kClose_Verb:
                if (fillState != kSingleLine_SkipFillState) {
                    ClosePath(&currentSegment);
                    SkData* data = currentSegment.copyToData();
                    content->write(data->data(), data->size());
                    data->unref();
                }
                currentSegment.reset();
                break;
            default:
                SkASSERT(false);
                break;
        }
    }
    if (currentSegment.bytesWritten() > 0) {
        SkData* data = currentSegment.copyToData();
        content->write(data->data(), data->size());
        data->unref();
    }
}