C++ SkMatrix::postTranslate方法代码示例

    void onDraw(SkCanvas* canvas) override {
        const struct {
            SkISize  size;
            SkScalar scaleX, scaleY;
            SkScalar opacity;
        } configs[] = {
            { SkISize::Make(200, 100), 1, 1, 1 },
            { SkISize::Make(200, 200), 1, 1, 1 },
            { SkISize::Make(200, 200), 1, 2, 1 },
            { SkISize::Make(400, 200), 2, 2, 1 },

            { SkISize::Make(200, 100), 1, 1, 0.9f  },
            { SkISize::Make(200, 200), 1, 1, 0.75f },
            { SkISize::Make(200, 200), 1, 2, 0.5f  },
            { SkISize::Make(400, 200), 2, 2, 0.25f },

            { SkISize::Make(200, 200), 0.5f, 1,    1 },
            { SkISize::Make(200, 200), 1,    0.5f, 1 },
            { SkISize::Make(200, 200), 0.5f, 0.5f, 1 },
            { SkISize::Make(200, 200), 2,    2,    1 },

            { SkISize::Make(200, 100), -1,  1, 1    },
            { SkISize::Make(200, 100),  1, -1, 1    },
            { SkISize::Make(200, 100), -1, -1, 1    },
            { SkISize::Make(200, 100), -1, -1, 0.5f },
        };

        const unsigned kDrawsPerRow = 4;
        const SkScalar kDrawSize = 250;

        for (size_t i = 0; i < SK_ARRAY_COUNT(configs); ++i) {
            SkPaint p;
            p.setAlpha(SkScalarRoundToInt(255 * configs[i].opacity));

            SkMatrix m = SkMatrix::MakeScale(configs[i].scaleX, configs[i].scaleY);
            if (configs[i].scaleX < 0) {
                m.postTranslate(SkIntToScalar(configs[i].size.width()), 0);
            }
            if (configs[i].scaleY < 0) {
                m.postTranslate(0, SkIntToScalar(configs[i].size.height()));
            }
            SkAutoTDelete<SkImageGenerator> gen(
                SkImageGenerator::NewFromPicture(configs[i].size, fPicture.get(), &m,
                                                 p.getAlpha() != 255 ? &p : nullptr));
            SkBitmap bm;
            gen->generateBitmap(&bm);

            const SkScalar x = kDrawSize * (i % kDrawsPerRow);
            const SkScalar y = kDrawSize * (i / kDrawsPerRow);

            p.setColor(0xfff0f0f0);
            p.setAlpha(255);
            canvas->drawRect(SkRect::MakeXYWH(x, y,
                                              SkIntToScalar(bm.width()),
                                              SkIntToScalar(bm.height())), p);
            canvas->drawBitmap(bm, x, y);
        }
    }

static void textonpath_slide(SkCanvas* canvas) {
    const char* text = "Displacement";
    size_t len =strlen(text);
    SkPath path;
    path.moveTo(100, 300);
    path.quadTo(300, 100, 500, 300);
    path.offset(0, -100);

    SkPaint paint;
    paint.setAntiAlias(true);
    paint.setTextSize(40);

    paint.setStyle(SkPaint::kStroke_Style);
    canvas->drawPath(path, paint);
    paint.setStyle(SkPaint::kFill_Style);

    SkScalar x = 50;
    paint.setColor(0xFF008800);
    canvas->drawTextOnPathHV(text, len, path,
                             x, paint.getTextSize()*2/3, paint);
    paint.setColor(SK_ColorRED);
    canvas->drawTextOnPathHV(text, len, path,
                             x + 60, 0, paint);
    paint.setColor(SK_ColorBLUE);
    canvas->drawTextOnPathHV(text, len, path,
                             x + 120, -paint.getTextSize()*2/3, paint);

    path.offset(0, 200);
    paint.setTextAlign(SkPaint::kRight_Align);

    text = "Matrices";
    len = strlen(text);
    SkScalar pathLen = getpathlen(path);
    SkMatrix matrix;

    paint.setColor(SK_ColorBLACK);
    paint.setStyle(SkPaint::kStroke_Style);
    canvas->drawPath(path, paint);
    paint.setStyle(SkPaint::kFill_Style);

    paint.setTextSize(50);
    canvas->drawTextOnPath(text, len, path, NULL, paint);

    paint.setColor(SK_ColorRED);
    matrix.setScale(-SK_Scalar1, SK_Scalar1);
    matrix.postTranslate(pathLen, 0);
    canvas->drawTextOnPath(text, len, path, &matrix, paint);

    paint.setColor(SK_ColorBLUE);
    matrix.setScale(SK_Scalar1, -SK_Scalar1);
    canvas->drawTextOnPath(text, len, path, &matrix, paint);

    paint.setColor(0xFF008800);
    matrix.setScale(-SK_Scalar1, -SK_Scalar1);
    matrix.postTranslate(pathLen, 0);
    canvas->drawTextOnPath(text, len, path, &matrix, paint);
}

void SkBitmapDevice::drawSpecial(const SkDraw& draw, SkSpecialImage* srcImg, int x, int y,
                                 const SkPaint& paint) {
    SkASSERT(!srcImg->isTextureBacked());

    SkBitmap resultBM;

    SkImageFilter* filter = paint.getImageFilter();
    if (filter) {
        SkIPoint offset = SkIPoint::Make(0, 0);
        SkMatrix matrix = *draw.fMatrix;
        matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
        const SkIRect clipBounds = draw.fRC->getBounds().makeOffset(-x, -y);
        SkAutoTUnref<SkImageFilterCache> cache(this->getImageFilterCache());
        SkImageFilter::OutputProperties outputProperties(fBitmap.colorSpace());
        SkImageFilter::Context ctx(matrix, clipBounds, cache.get(), outputProperties);
        
        sk_sp<SkSpecialImage> resultImg(filter->filterImage(srcImg, ctx, &offset));
        if (resultImg) {
            SkPaint tmpUnfiltered(paint);
            tmpUnfiltered.setImageFilter(nullptr);
            if (resultImg->getROPixels(&resultBM)) {
                this->drawSprite(draw, resultBM, x + offset.x(), y + offset.y(), tmpUnfiltered);
            }
        }
    } else {
        if (srcImg->getROPixels(&resultBM)) {
            this->drawSprite(draw, resultBM, x, y, paint);
        }
    }
}

    virtual void onDraw(SkCanvas* canvas) {
        this->drawBG(canvas);

        SkMatrix matrix;

        SkGroupShape* gs = new SkGroupShape;
        SkAutoUnref aur(gs);
        gs->appendShape(&fGroup);
        matrix.setScale(-SK_Scalar1, SK_Scalar1);
        matrix.postTranslate(SkIntToScalar(220), SkIntToScalar(240));
        gs->appendShape(&fGroup, matrix);
        matrix.setTranslate(SkIntToScalar(240), 0);
        matrix.preScale(SK_Scalar1*2, SK_Scalar1*2);
        gs->appendShape(&fGroup, matrix);

#if 1
        SkPicture* pict = new SkPicture;
        SkCanvas* cv = pict->beginRecording(1000, 1000);
        cv->scale(SK_ScalarHalf, SK_ScalarHalf);
        gs->draw(cv);
        cv->translate(SkIntToScalar(680), SkIntToScalar(480));
        cv->scale(-SK_Scalar1, SK_Scalar1);
        gs->draw(cv);
        pict->endRecording();
        canvas->drawPicture(*pict);
        pict->unref();
#endif
}

const GrFragmentProcessor* GrTextureAdjuster::createFragmentProcessor(
                                        const SkMatrix& origTextureMatrix,
                                        const SkRect& origConstraintRect,
                                        FilterConstraint filterConstraint,
                                        bool coordsLimitedToConstraintRect,
                                        const GrTextureParams::FilterMode* filterOrNullForBicubic) {

    SkMatrix textureMatrix = origTextureMatrix;
    const SkIRect* contentArea = this->contentAreaOrNull();
    // Convert the constraintRect to be relative to the texture rather than the content area so
    // that both rects are in the same coordinate system.
    SkTCopyOnFirstWrite<SkRect> constraintRect(origConstraintRect);
    if (contentArea) {
        SkScalar l = SkIntToScalar(contentArea->fLeft);
        SkScalar t = SkIntToScalar(contentArea->fTop);
        constraintRect.writable()->offset(l, t);
        textureMatrix.postTranslate(l, t);
    }

    SkRect domain;
    GrTextureParams params;
    if (filterOrNullForBicubic) {
        params.setFilterMode(*filterOrNullForBicubic);
    }
    SkAutoTUnref<GrTexture> texture(this->refTextureSafeForParams(params, nullptr));
    if (!texture) {
        return nullptr;
    }
    // If we made a copy then we only copied the contentArea, in which case the new texture is all
    // content.
    if (texture != this->originalTexture()) {
        contentArea = nullptr;
    }

    DomainMode domainMode =
        determine_domain_mode(*constraintRect, filterConstraint, coordsLimitedToConstraintRect,
                              texture->width(), texture->height(),
                              contentArea, filterOrNullForBicubic,
                              &domain);
    if (kTightCopy_DomainMode == domainMode) {
        // TODO: Copy the texture and adjust the texture matrix (both parts need to consider
        // non-int constraint rect)
        // For now: treat as bilerp and ignore what goes on above level 0.

        // We only expect MIP maps to require a tight copy.
        SkASSERT(filterOrNullForBicubic &&
                 GrTextureParams::kMipMap_FilterMode == *filterOrNullForBicubic);
        static const GrTextureParams::FilterMode kBilerp = GrTextureParams::kBilerp_FilterMode;
        domainMode =
            determine_domain_mode(*constraintRect, filterConstraint, coordsLimitedToConstraintRect,
                                  texture->width(), texture->height(),
                                  contentArea, &kBilerp, &domain);
        SkASSERT(kTightCopy_DomainMode != domainMode);
    }
    SkASSERT(kNoDomain_DomainMode == domainMode ||
             (domain.fLeft <= domain.fRight && domain.fTop <= domain.fBottom));
    textureMatrix.postIDiv(texture->width(), texture->height());
    return create_fp_for_domain_and_filter(texture, textureMatrix, domainMode, domain,
                                           filterOrNullForBicubic);
}

void SkPDFDevice::internalDrawBitmap(const SkMatrix& matrix,
                                     const SkBitmap& bitmap,
                                     const SkIRect* srcRect,
                                     const SkPaint& paint) {
    SkIRect subset = SkIRect::MakeWH(bitmap.width(), bitmap.height());
    if (srcRect && !subset.intersect(*srcRect))
        return;

    SkPDFImage* image = SkPDFImage::CreateImage(bitmap, subset, paint);
    if (!image)
        return;

    SkMatrix scaled;
    // Adjust for origin flip.
    scaled.setScale(1, -1);
    scaled.postTranslate(0, 1);
    // Scale the image up from 1x1 to WxH.
    scaled.postScale(SkIntToScalar(subset.width()),
                     SkIntToScalar(subset.height()));
    scaled.postConcat(matrix);
    SkMatrix curTransform = setTransform(scaled);
    updateGSFromPaint(paint, false);

    fXObjectResources.push(image);  // Transfer reference.
    fContent.writeText("/X");
    fContent.writeDecAsText(fXObjectResources.count() - 1);
    fContent.writeText(" Do\n");
    setTransform(curTransform);
}

	ShapesGM() {
        SkMatrix m;
        fGroup.appendShape(make_shape0(false))->unref();
        m.setRotate(SkIntToScalar(30), SkIntToScalar(50), SkIntToScalar(50));
        m.postTranslate(0, SkIntToScalar(120));
        fGroup.appendShape(make_shape0(true), m)->unref();

        m.setTranslate(SkIntToScalar(120), 0);
        fGroup.appendShape(make_shape1(), m)->unref();
        m.postTranslate(0, SkIntToScalar(120));
        fGroup.appendShape(make_shape2(), m)->unref();
        
        for (size_t i = 0; i < SK_ARRAY_COUNT(fMatrixRefs); i++) {
            SkSafeRef(fMatrixRefs[i] = fGroup.getShapeMatrixRef(i));
        }
    }

 SkMatrix onGetInitialTransform() const override {
     SkMatrix result;
     SkScalar scale = 0.8f;
     result.setScale(scale, scale);
     result.postTranslate(SkIntToScalar(7), SkIntToScalar(23));
     return result;
 }

static void make_strip(Rec* rec, int texWidth, int texHeight) {
    const SkScalar tx = SkIntToScalar(texWidth);
    const SkScalar ty = SkIntToScalar(texHeight);
    const int n = 24;

    rec->fMode = SkCanvas::kTriangleStrip_VertexMode;
    rec->fCount = 2 * (n + 1);
    rec->fVerts = new SkPoint[rec->fCount];
    rec->fTexs  = new SkPoint[rec->fCount];

    SkPoint* v = rec->fVerts;
    SkPoint* t = rec->fTexs;

    for (int i = 0; i < n; i++) {
        SkScalar cos;
        SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
        v[i*2 + 0].set(cos/2, sin/2);
        v[i*2 + 1].set(cos, sin);

        t[i*2 + 0].set(tx * i / n, ty);
        t[i*2 + 1].set(tx * i / n, 0);
    }
    v[2*n + 0] = v[0];
    v[2*n + 1] = v[1];

    t[2*n + 0].set(tx, ty);
    t[2*n + 1].set(tx, 0);

    SkMatrix m;
    m.setScale(SkIntToScalar(100), SkIntToScalar(100));
    m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
    m.mapPoints(v, rec->fCount);
}

static void scaleMatrix(const SkPath& one, const SkPath& two, SkMatrix& scale) {
    SkRect larger = one.getBounds();
    larger.join(two.getBounds());
    SkScalar largerWidth = larger.width();
    if (largerWidth < 4) {
        largerWidth = 4;
    }
    SkScalar largerHeight = larger.height();
    if (largerHeight < 4) {
        largerHeight = 4;
    }
    SkScalar hScale = (bitWidth - 2) / largerWidth;
    SkScalar vScale = (bitHeight - 2) / largerHeight;
    scale.reset();
    scale.preScale(hScale, vScale);
    larger.fLeft *= hScale;
    larger.fRight *= hScale;
    larger.fTop *= vScale;
    larger.fBottom *= vScale;
    SkScalar dx = -16000 > larger.fLeft ? -16000 - larger.fLeft
            : 16000 < larger.fRight ? 16000 - larger.fRight : 0;
    SkScalar dy = -16000 > larger.fTop ? -16000 - larger.fTop
            : 16000 < larger.fBottom ? 16000 - larger.fBottom : 0;
    scale.postTranslate(dx, dy);
}

    virtual void onDraw(SkCanvas* canvas) {

        SkPoint pts[2] = {
            { 0, 0 },
            { SkIntToScalar(100), SkIntToScalar(100) }
        };
        SkShader::TileMode tm = SkShader::kClamp_TileMode;
        SkRect r = { 0, 0, SkIntToScalar(100), SkIntToScalar(100) };
        SkPaint paint;
        paint.setAntiAlias(true);
        paint.setDither(fDither);

        canvas->translate(SkIntToScalar(20), SkIntToScalar(20));
        for (size_t i = 0; i < SK_ARRAY_COUNT(gGradData); i++) {
            canvas->save();
            for (size_t j = 0; j < SK_ARRAY_COUNT(gGradMakers); j++) {
                SkMatrix scale = SkMatrix::I();

                if (i == 5) { // if the clamp case
                    scale.setScale(0.5f, 0.5f);
                    scale.postTranslate(25.f, 25.f);
                }

                paint.setShader(gGradMakers[j](pts, gGradData[i], tm, scale));
                canvas->drawRect(r, paint);
                canvas->translate(0, SkIntToScalar(120));
            }
            canvas->restore();
            canvas->translate(SkIntToScalar(120), 0);
        }
    }

    void make_fan(Rec* rec, int texWidth, int texHeight) {
        const SkScalar tx = SkIntToScalar(texWidth);
        const SkScalar ty = SkIntToScalar(texHeight);
        const int n = 24;

        rec->fMode = SkCanvas::kTriangleFan_VertexMode;
        rec->fCount = n + 2;
        rec->fVerts = new SkPoint[rec->fCount];
        rec->fTexs  = new SkPoint[rec->fCount];

        SkPoint* v = rec->fVerts;
        SkPoint* t = rec->fTexs;

        v[0].set(0, 0);
        t[0].set(0, 0);
        for (int i = 0; i < n; i++) {
            SkScalar cos;
            SkScalar sin = SkScalarSinCos(SK_ScalarPI * 2 * i / n, &cos);
            v[i+1].set(cos, sin);
            t[i+1].set(i*tx/n, ty);
        }
        v[n+1] = v[1];
        t[n+1].set(tx, ty);

        SkMatrix m;
        m.setScale(SkIntToScalar(100), SkIntToScalar(100));
        m.postTranslate(SkIntToScalar(110), SkIntToScalar(110));
        m.mapPoints(v, rec->fCount);
    }

void SkBaseDevice::drawSpriteWithFilter(const SkDraw& draw, const SkBitmap& bitmap,
                                        int x, int y,
                                        const SkPaint& paint) {
    SkImageFilter* filter = paint.getImageFilter();
    SkASSERT(filter);

    SkIPoint offset = SkIPoint::Make(0, 0);
    SkMatrix matrix = *draw.fMatrix;
    matrix.postTranslate(SkIntToScalar(-x), SkIntToScalar(-y));
    const SkIRect clipBounds = draw.fRC->getBounds().makeOffset(-x, -y);
    SkAutoTUnref<SkImageFilterCache> cache(this->getImageFilterCache());
    SkImageFilter::Context ctx(matrix, clipBounds, cache.get());

    sk_sp<SkSpecialImage> srcImg(SkSpecialImage::internal_fromBM(bitmap, &this->surfaceProps()));
    if (!srcImg) {
        return; // something disastrous happened
    }

    sk_sp<SkSpecialImage> resultImg(filter->filterImage(srcImg.get(), ctx, &offset));
    if (resultImg) {
        SkPaint tmpUnfiltered(paint);
        tmpUnfiltered.setImageFilter(nullptr);
        SkBitmap resultBM;
        if (resultImg->internal_getBM(&resultBM)) {
            // TODO: add drawSprite(SkSpecialImage) to SkDevice? (see skbug.com/5073)
            this->drawSprite(draw, resultBM, x + offset.x(), y + offset.y(), tmpUnfiltered);
        }
    }
}

void
DrawTargetSkia::MaskSurface(const Pattern &aSource,
                            SourceSurface *aMask,
                            Point aOffset,
                            const DrawOptions &aOptions)
{
  MarkChanged();
  AutoPaintSetup paint(mCanvas.get(), aOptions, aSource);

  TempBitmap bitmap = GetBitmapForSurface(aMask);
  if (bitmap.mBitmap.colorType() == kAlpha_8_SkColorType) {
    mCanvas->drawBitmap(bitmap.mBitmap, aOffset.x, aOffset.y, &paint.mPaint);
  } else {
    SkPaint maskPaint;
    TempBitmap tmpBitmap;
    SetPaintPattern(maskPaint, SurfacePattern(aMask, ExtendMode::CLAMP), tmpBitmap);

    SkMatrix transform = maskPaint.getShader()->getLocalMatrix();
    transform.postTranslate(SkFloatToScalar(aOffset.x), SkFloatToScalar(aOffset.y));
    maskPaint.getShader()->setLocalMatrix(transform);

    SkLayerRasterizer::Builder builder;
    builder.addLayer(maskPaint);
    SkAutoTUnref<SkRasterizer> raster(builder.detachRasterizer());
    paint.mPaint.setRasterizer(raster.get());

    IntSize size = aMask->GetSize();
    Rect rect = Rect(aOffset.x, aOffset.y, size.width, size.height);
    mCanvas->drawRect(RectToSkRect(rect), paint.mPaint);
  }
}

GrTexture* SkPictureImageGenerator::onGenerateTexture(GrContext* ctx, SkImageUsageType usage,
                                                      const SkIRect* subset) {
    const SkImageInfo& info = this->getInfo();
    SkImageInfo surfaceInfo = subset ? info.makeWH(subset->width(), subset->height()) : info;

    //
    // TODO: respect the usage, by possibly creating a different (pow2) surface
    //
    SkAutoTUnref<SkSurface> surface(SkSurface::NewRenderTarget(ctx,
                                                               SkSurface::kYes_Budgeted,
                                                               surfaceInfo));
    if (!surface.get()) {
        return nullptr;
    }

    SkMatrix matrix = fMatrix;
    if (subset) {
        matrix.postTranslate(-subset->x(), -subset->y());
    }
    surface->getCanvas()->clear(0); // does NewRenderTarget promise to do this for us?
    surface->getCanvas()->drawPicture(fPicture, &matrix, fPaint.getMaybeNull());
    SkAutoTUnref<SkImage> image(surface->newImageSnapshot());
    if (!image.get()) {
        return nullptr;
    }
    return SkSafeRef(image->getTexture());
}