C++ SkMatrix::mapXY方法代码示例

void SkGScalerContext::generateMetrics(SkGlyph* glyph) {
    fProxy->getMetrics(glyph);

    SkVector advance;
    fMatrix.mapXY(SkFloatToScalar(glyph->fAdvanceX),
                  SkFloatToScalar(glyph->fAdvanceY), &advance);
    glyph->fAdvanceX = SkScalarToFloat(advance.fX);
    glyph->fAdvanceY = SkScalarToFloat(advance.fY);

    SkPath path;
    fProxy->getPath(*glyph, &path);
    path.transform(fMatrix);

    SkRect storage;
    const SkPaint& paint = fFace->paint();
    const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
                                                        &storage,
                                                        SkPaint::kFill_Style);
    SkIRect ibounds;
    newBounds.roundOut(&ibounds);
    glyph->fLeft = ibounds.fLeft;
    glyph->fTop = ibounds.fTop;
    glyph->fWidth = ibounds.width();
    glyph->fHeight = ibounds.height();
    glyph->fMaskFormat = SkMask::kARGB32_Format;
}

static bool oval_contains(const SkRect& r, SkScalar x, SkScalar y) {
    SkMatrix m;
    m.setRectToRect(r, gUnitSquare, SkMatrix::kFill_ScaleToFit);
    SkPoint pt;
    m.mapXY(x, y, &pt);
    return pt.lengthSqd() <= 1;
}

 SkPoint invertPt(SkScalar x, SkScalar y) {
     SkPoint pt;
     SkMatrix m;
     fMatrix.invert(&m);
     m.mapXY(x, y, &pt);
     return pt;
 }

void SkGScalerContext::generateAdvance(SkGlyph* glyph) {
    fProxy->getAdvance(glyph);

    SkVector advance;
    fMatrix.mapXY(SkFloatToScalar(glyph->fAdvanceX),
                  SkFloatToScalar(glyph->fAdvanceY), &advance);
    glyph->fAdvanceX = SkScalarToFloat(advance.fX);
    glyph->fAdvanceY = SkScalarToFloat(advance.fY);
}

void SkScalerContext_Windows::generateMetrics(SkGlyph* glyph) {

    SkASSERT(fDDC);

    GLYPHMETRICS gm;
    sk_bzero(&gm, sizeof(gm));

    glyph->fRsbDelta = 0;
    glyph->fLsbDelta = 0;

    // Note: need to use GGO_GRAY8_BITMAP instead of GGO_METRICS because GGO_METRICS returns a smaller
    // BlackBlox; we need the bigger one in case we need the image.  fAdvance is the same.
    uint32_t ret = GetGlyphOutlineW(fDDC, glyph->getGlyphID(0), GGO_GRAY8_BITMAP | GGO_GLYPH_INDEX, &gm, 0, NULL, &fMat22);

    if (GDI_ERROR != ret) {
        if (ret == 0) {
            // for white space, ret is zero and gmBlackBoxX, gmBlackBoxY are 1 incorrectly!
            gm.gmBlackBoxX = gm.gmBlackBoxY = 0;
        }
        glyph->fWidth   = gm.gmBlackBoxX;
        glyph->fHeight  = gm.gmBlackBoxY;
        glyph->fTop     = SkToS16(gm.gmptGlyphOrigin.y - gm.gmBlackBoxY);
        glyph->fLeft    = SkToS16(gm.gmptGlyphOrigin.x);
        glyph->fAdvanceX = SkIntToFixed(gm.gmCellIncX);
        glyph->fAdvanceY = -SkIntToFixed(gm.gmCellIncY);

        // we outset by 1 in all dimensions, since the lcd image may bleed outside
        // of the computed bounds returned by GetGlyphOutline.
        // This was deduced by trial and error for small text (e.g. 8pt), so there
        // maybe a more precise way to make this adjustment...
        if (SkMask::kLCD16_Format == fRec.fMaskFormat) {
            glyph->fWidth += 2;
            glyph->fHeight += 2;
            glyph->fTop -= 1;
            glyph->fLeft -= 1;
        }

        if (fHiResFont) {
            SelectObject(fDDC, fHiResFont);
            sk_bzero(&gm, sizeof(gm));
            ret = GetGlyphOutlineW(fDDC, glyph->getGlyphID(0), GGO_METRICS | GGO_GLYPH_INDEX, &gm, 0, NULL, &fMat22Identity);
            if (GDI_ERROR != ret) {
                SkPoint advance;
                fHiResMatrix.mapXY(SkIntToScalar(gm.gmCellIncX), SkIntToScalar(gm.gmCellIncY), &advance);
                glyph->fAdvanceX = SkScalarToFixed(advance.fX);
                glyph->fAdvanceY = SkScalarToFixed(advance.fY);
            }
            SelectObject(fDDC, fFont);
        }
    } else {
        glyph->fWidth = 0;
    }
}

bool SkView::globalToLocal(SkScalar x, SkScalar y, SkPoint* local) const {
    if (local) {
        SkMatrix m;
        this->localToGlobal(&m);
        if (!m.invert(&m)) {
            return false;
        }
        SkPoint p;
        m.mapXY(x, y, &p);
        local->set(p.fX, p.fY);
    }

    return true;
}

void SkRandomScalerContext::generateMetrics(SkGlyph* glyph) {
    fProxy->getAdvance(glyph);

    SkVector advance;
    fMatrix.mapXY(SkFixedToScalar(glyph->fAdvanceX),
                  SkFixedToScalar(glyph->fAdvanceY), &advance);
    glyph->fAdvanceX = SkScalarToFixed(advance.fX);
    glyph->fAdvanceY = SkScalarToFixed(advance.fY);

    SkPath path;
    fProxy->getPath(*glyph, &path);
    path.transform(fMatrix);

    SkRect storage;
    const SkPaint& paint = fFace->paint();
    const SkRect& newBounds = paint.doComputeFastBounds(path.getBounds(),
                                                        &storage,
                                                        SkPaint::kFill_Style);
    SkIRect ibounds;
    newBounds.roundOut(&ibounds);
    glyph->fLeft = ibounds.fLeft;
    glyph->fTop = ibounds.fTop;
    glyph->fWidth = ibounds.width();
    glyph->fHeight = ibounds.height();

    // Here we will change the mask format of the glyph
    // NOTE this is being overridden by the base class
    SkMask::Format format;
    switch (glyph->getGlyphID() % 6) {
        case 0:
            format = SkMask::kLCD16_Format;
            break;
        case 1:
            format = SkMask::kA8_Format;
            break;
        case 2:
            format = SkMask::kARGB32_Format;
            break;
        default:
            // we will fiddle with these in generate image
            format = (SkMask::Format)MASK_FORMAT_UNKNOWN;
    }

    glyph->fMaskFormat = format;
}

SkMatrix Viewer::computeMatrix() {
    SkMatrix m;
    m.reset();

    if (fZoomLevel) {
        SkPoint center;
        //m = this->getLocalMatrix();//.invert(&m);
        m.mapXY(fZoomCenterX, fZoomCenterY, &center);
        SkScalar cx = center.fX;
        SkScalar cy = center.fY;

        m.setTranslate(-cx, -cy);
        m.postScale(fZoomScale, fZoomScale);
        m.postTranslate(cx, cy);
    }

    m.preConcat(fGesture.localM());
    m.preConcat(fGesture.globalM());

    return m;
}

void GrBitmapTextContext::onDrawText(GrRenderTarget* rt, const GrClip& clip,
                                     const GrPaint& paint, const SkPaint& skPaint,
                                     const SkMatrix& viewMatrix,
                                     const char text[], size_t byteLength,
                                     SkScalar x, SkScalar y) {
    SkASSERT(byteLength == 0 || text != NULL);

    // nothing to draw
    if (text == NULL || byteLength == 0 /*|| fRC->isEmpty()*/) {
        return;
    }

    this->init(rt, clip, paint, skPaint);

    SkDrawCacheProc glyphCacheProc = fSkPaint.getDrawCacheProc();

    SkAutoGlyphCache    autoCache(fSkPaint, &fDeviceProperties, &viewMatrix);
    SkGlyphCache*       cache = autoCache.getCache();
    GrFontScaler*       fontScaler = GetGrFontScaler(cache);

    // transform our starting point
    {
        SkPoint loc;
        viewMatrix.mapXY(x, y, &loc);
        x = loc.fX;
        y = loc.fY;
    }

    // need to measure first
    int numGlyphs;
    if (fSkPaint.getTextAlign() != SkPaint::kLeft_Align) {
        SkVector    stopVector;
        numGlyphs = MeasureText(cache, glyphCacheProc, text, byteLength, &stopVector);

        SkScalar    stopX = stopVector.fX;
        SkScalar    stopY = stopVector.fY;

        if (fSkPaint.getTextAlign() == SkPaint::kCenter_Align) {
            stopX = SkScalarHalf(stopX);
            stopY = SkScalarHalf(stopY);
        }
        x -= stopX;
        y -= stopY;
    } else {
        numGlyphs = fSkPaint.textToGlyphs(text, byteLength, NULL);
    }
    fTotalVertexCount = kVerticesPerGlyph*numGlyphs;

    const char* stop = text + byteLength;

    SkAutoKern autokern;

    SkFixed fxMask = ~0;
    SkFixed fyMask = ~0;
    SkScalar halfSampleX, halfSampleY;
    if (cache->isSubpixel()) {
        halfSampleX = halfSampleY = SkFixedToScalar(SkGlyph::kSubpixelRound);
        SkAxisAlignment baseline = SkComputeAxisAlignmentForHText(viewMatrix);
        if (kX_SkAxisAlignment == baseline) {
            fyMask = 0;
            halfSampleY = SK_ScalarHalf;
        } else if (kY_SkAxisAlignment == baseline) {
            fxMask = 0;
            halfSampleX = SK_ScalarHalf;
        }
    } else {
        halfSampleX = halfSampleY = SK_ScalarHalf;
    }

    Sk48Dot16 fx = SkScalarTo48Dot16(x + halfSampleX);
    Sk48Dot16 fy = SkScalarTo48Dot16(y + halfSampleY);

    // if we have RGB, then we won't have any SkShaders so no need to use a localmatrix, but for
    // performance reasons we just invert here instead
    if (!viewMatrix.invert(&fLocalMatrix)) {
        SkDebugf("Cannot invert viewmatrix\n");
        return;
    }

    while (text < stop) {
        const SkGlyph& glyph = glyphCacheProc(cache, &text, fx & fxMask, fy & fyMask);

        fx += autokern.adjust(glyph);

        if (glyph.fWidth) {
            this->appendGlyph(GrGlyph::Pack(glyph.getGlyphID(),
                                            glyph.getSubXFixed(),
                                            glyph.getSubYFixed(),
                                            GrGlyph::kCoverage_MaskStyle),
                              Sk48Dot16FloorToInt(fx),
                              Sk48Dot16FloorToInt(fy),
                              fontScaler);
        }

        fx += glyph.fAdvanceX;
        fy += glyph.fAdvanceY;
    }

    this->finish();
}

void SkScalerContext_Windows::generateMetrics(SkGlyph* glyph) {

    SkASSERT(fDDC);

    if (fType == SkScalerContext_Windows::kBitmap_Type) {
        SIZE size;
        WORD glyphs = glyph->getGlyphID(0);
        if (0 == GetTextExtentPointI(fDDC, &glyphs, 1, &size)) {
            glyph->fWidth = SkToS16(fTM.tmMaxCharWidth);
        } else {
            glyph->fWidth = SkToS16(size.cx);
        }
        glyph->fHeight = SkToS16(size.cy);

        glyph->fTop = SkToS16(-fTM.tmAscent);
        glyph->fLeft = SkToS16(0);
        glyph->fAdvanceX = SkIntToFixed(glyph->fWidth);
        glyph->fAdvanceY = 0;

        //Apply matrix to values.
        glyph->fAdvanceY = SkFixedMul(SkFIXEDToFixed(fMat22.eM21), glyph->fAdvanceX);
        glyph->fAdvanceX = SkFixedMul(SkFIXEDToFixed(fMat22.eM11), glyph->fAdvanceX);

        return;
    }

    GLYPHMETRICS gm;
    sk_bzero(&gm, sizeof(gm));

    glyph->fRsbDelta = 0;
    glyph->fLsbDelta = 0;

    // Note: need to use GGO_GRAY8_BITMAP instead of GGO_METRICS because GGO_METRICS returns a smaller
    // BlackBlox; we need the bigger one in case we need the image.  fAdvance is the same.
    uint32_t ret = GetGlyphOutlineW(fDDC, glyph->getGlyphID(0), GGO_GRAY8_BITMAP | GGO_GLYPH_INDEX, &gm, 0, NULL, &fMat22);
    if (GDI_ERROR == ret) {
        ensure_typeface_accessible(fRec.fFontID);
        ret = GetGlyphOutlineW(fDDC, glyph->getGlyphID(0), GGO_GRAY8_BITMAP | GGO_GLYPH_INDEX, &gm, 0, NULL, &fMat22);
    }

    if (GDI_ERROR != ret) {
        if (ret == 0) {
            // for white space, ret is zero and gmBlackBoxX, gmBlackBoxY are 1 incorrectly!
            gm.gmBlackBoxX = gm.gmBlackBoxY = 0;
        }
        glyph->fWidth   = gm.gmBlackBoxX;
        glyph->fHeight  = gm.gmBlackBoxY;
        glyph->fTop     = SkToS16(gm.gmptGlyphOrigin.y - gm.gmBlackBoxY);
        glyph->fLeft    = SkToS16(gm.gmptGlyphOrigin.x);
        glyph->fAdvanceX = SkIntToFixed(gm.gmCellIncX);
        glyph->fAdvanceY = -SkIntToFixed(gm.gmCellIncY);

        // we outset in all dimensions, since the image may bleed outside
        // of the computed bounds returned by GetGlyphOutline.
        // This was deduced by trial and error for small text (e.g. 8pt), so there
        // maybe a more precise way to make this adjustment...
        //
        // This test shows us clipping the tops of some of the CJK fonts unless we
        // increase the top of the box by 2, hence the height by 4. This seems to
        // correspond to an embedded bitmap font, but not sure.
        //     LayoutTests/fast/text/backslash-to-yen-sign-euc.html
        //
        if (glyph->fWidth) {    // don't outset an empty glyph
            glyph->fWidth += 4;
            glyph->fHeight += 4;
            glyph->fTop -= 2;
            glyph->fLeft -= 2;
        }

        if (fHiResFont) {
            SelectObject(fDDC, fHiResFont);
            sk_bzero(&gm, sizeof(gm));
            ret = GetGlyphOutlineW(fDDC, glyph->getGlyphID(0), GGO_METRICS | GGO_GLYPH_INDEX, &gm, 0, NULL, &fMat22Identity);
            if (GDI_ERROR != ret) {
                SkPoint advance;
                fHiResMatrix.mapXY(SkIntToScalar(gm.gmCellIncX), SkIntToScalar(gm.gmCellIncY), &advance);
                glyph->fAdvanceX = SkScalarToFixed(advance.fX);
                glyph->fAdvanceY = SkScalarToFixed(advance.fY);
            }
            SelectObject(fDDC, fFont);
        }
    } else {
        glyph->zeroMetrics();
    }
}