C++ SkMatrix::setIDiv方法代码示例

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
        GrDrawTarget* target,
        const SkIRect& rect) {
    GrDrawState* drawState = target->drawState();

    GrDrawState::AutoViewMatrixRestore avmr;
    if (!avmr.setIdentity(drawState)) {
        return;
    }
    GrDrawState::AutoRestoreEffects are(drawState);

    SkRect dstRect = SkRect::MakeLTRB(SK_Scalar1 * rect.fLeft,
                                      SK_Scalar1 * rect.fTop,
                                      SK_Scalar1 * rect.fRight,
                                      SK_Scalar1 * rect.fBottom);

    // We want to use device coords to compute the texture coordinates. We set our matrix to be
    // equal to the view matrix followed by a translation so that the top-left of the device bounds
    // maps to 0,0, and then a scaling matrix to normalized coords. We apply this matrix to the
    // vertex positions rather than local coords.
    SkMatrix maskMatrix;
    maskMatrix.setIDiv(texture->width(), texture->height());
    maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));
    maskMatrix.preConcat(drawState->getViewMatrix());

    drawState->addCoverageEffect(
        GrSimpleTextureEffect::Create(texture,
                                      maskMatrix,
                                      GrTextureParams::kNone_FilterMode,
                                      kPosition_GrCoordSet))->unref();

    target->drawSimpleRect(dstRect);
}

void GrClipMaskManager::mergeMask(GrPipelineBuilder* pipelineBuilder,
                                  GrTexture* dstMask,
                                  GrTexture* srcMask,
                                  SkRegion::Op op,
                                  const SkIRect& dstBound,
                                  const SkIRect& srcBound) {
    pipelineBuilder->setRenderTarget(dstMask->asRenderTarget());

    // We want to invert the coverage here
    set_coverage_drawing_xpf(op, false, pipelineBuilder);

    SkMatrix sampleM;
    sampleM.setIDiv(srcMask->width(), srcMask->height());

    pipelineBuilder->addCoverageFragmentProcessor(
        GrTextureDomainEffect::Create(srcMask,
                                      sampleM,
                                      GrTextureDomain::MakeTexelDomain(srcMask, srcBound),
                                      GrTextureDomain::kDecal_Mode,
                                      GrTextureParams::kNone_FilterMode))->unref();

    // The color passed in here does not matter since the coverageSetOpXP won't read it.
    fDrawTarget->drawNonAARect(*pipelineBuilder,
                               GrColor_WHITE,
                               SkMatrix::I(),
                               SkRect::Make(dstBound));
}

void GrClipMaskManager::mergeMask(GrTexture* dstMask,
                                  GrTexture* srcMask,
                                  SkRegion::Op op,
                                  const SkIRect& dstBound,
                                  const SkIRect& srcBound) {
    GrDrawState::AutoViewMatrixRestore avmr;
    GrDrawState* drawState = fGpu->drawState();
    SkAssertResult(avmr.setIdentity(drawState));
    GrDrawState::AutoRestoreEffects are(drawState);

    drawState->setRenderTarget(dstMask->asRenderTarget());

    setup_boolean_blendcoeffs(drawState, op);

    SkMatrix sampleM;
    sampleM.setIDiv(srcMask->width(), srcMask->height());

    drawState->addColorEffect(
        GrTextureDomainEffect::Create(srcMask,
                                      sampleM,
                                      GrTextureDomain::MakeTexelDomain(srcMask, srcBound),
                                      GrTextureDomain::kDecal_Mode,
                                      GrTextureParams::kNone_FilterMode))->unref();
    fGpu->drawSimpleRect(SkRect::Make(dstBound), NULL);
}

void GrClipMaskManager::mergeMask(GrTexture* dstMask,
                                  GrTexture* srcMask,
                                  SkRegion::Op op,
                                  const GrIRect& dstBound,
                                  const GrIRect& srcBound) {
    GrDrawState* drawState = fGpu->drawState();
    SkMatrix oldMatrix = drawState->getViewMatrix();
    drawState->viewMatrix()->reset();

    drawState->setRenderTarget(dstMask->asRenderTarget());

    setup_boolean_blendcoeffs(drawState, op);

    SkMatrix sampleM;
    sampleM.setIDiv(srcMask->width(), srcMask->height());
    drawState->setEffect(0,
        GrTextureDomainEffect::Create(srcMask,
                                      sampleM,
                                      GrTextureDomainEffect::MakeTexelDomain(srcMask, srcBound),
                                      GrTextureDomainEffect::kDecal_WrapMode,
                                      false))->unref();
    fGpu->drawSimpleRect(SkRect::MakeFromIRect(dstBound), NULL);

    drawState->disableStage(0);
    drawState->setViewMatrix(oldMatrix);
}

BOOL
_DC::ExtTextOut(int x, int y, UINT options, LPCRECTDef lprect, const char* pszText, const int * lpDx){
	if( !context_ || !pszText)
		return FALSE;

	// Invalid rect area.
	if( lprect && (lprect->right <= 0 || lprect->bottom <= 0) )
		return FALSE;
	
	BOOL		bRet = FALSE;
	if (_canvas) {
		_skPaintText.setTextEncoding(SkPaint::TextEncoding::kUTF8_TextEncoding);

		_canvas->save();
		SkMatrix m;
		m.setIDiv(1.0f, -1.0f);
		_canvas->setMatrix(m);

		int bytesLen = _tcslen(pszText)*sizeof(char);
		SkScalar textSize = _skPaintText.getTextSize();
		
		int height = _canvas->imageInfo().fHeight;
		_canvas->drawText(pszText, bytesLen, SkIntToScalar(x), -1.0f * SkIntToScalar(height - y) + textSize, _skPaintText);
		_canvas->restore();
		bRet = TRUE;
	}
	else {
		wchar_t		wszTemp[256];
		int			nLen = StringHelper::UTF8ToUnicode(pszText, wszTemp, 255);
		bRet = (TRUE == ::ExtTextOutW(context_, x, y, options, lprect, wszTemp, nLen, NULL));
	}
	return	bRet;
	}

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
                                              GrDrawTarget* target,
                                              GrPipelineBuilder* pipelineBuilder,
                                              GrColor color,
                                              const SkMatrix& viewMatrix,
                                              const SkIRect& rect) {
    SkMatrix invert;
    if (!viewMatrix.invert(&invert)) {
        return;
    }
    GrPipelineBuilder::AutoRestoreFragmentProcessors arfp(pipelineBuilder);

    SkRect dstRect = SkRect::MakeLTRB(SK_Scalar1 * rect.fLeft,
                                      SK_Scalar1 * rect.fTop,
                                      SK_Scalar1 * rect.fRight,
                                      SK_Scalar1 * rect.fBottom);

    // We use device coords to compute the texture coordinates. We take the device coords and apply
    // a translation so that the top-left of the device bounds maps to 0,0, and then a scaling
    // matrix to normalized coords.
    SkMatrix maskMatrix;
    maskMatrix.setIDiv(texture->width(), texture->height());
    maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));

    pipelineBuilder->addCoverageProcessor(
                         GrSimpleTextureEffect::Create(texture,
                                                       maskMatrix,
                                                       GrTextureParams::kNone_FilterMode,
                                                       kDevice_GrCoordSet))->unref();

    target->drawRect(pipelineBuilder, color, SkMatrix::I(), dstRect, NULL, &invert);
}

const GrFragmentProcessor* SkImageShader::asFragmentProcessor(GrContext* context,
        const SkMatrix& viewM,
        const SkMatrix* localMatrix,
        SkFilterQuality filterQuality,
        GrProcessorDataManager* mgr) const {
    SkMatrix matrix;
    matrix.setIDiv(fImage->width(), fImage->height());

    SkMatrix lmInverse;
    if (!this->getLocalMatrix().invert(&lmInverse)) {
        return nullptr;
    }
    if (localMatrix) {
        SkMatrix inv;
        if (!localMatrix->invert(&inv)) {
            return nullptr;
        }
        lmInverse.postConcat(inv);
    }
    matrix.preConcat(lmInverse);

    SkShader::TileMode tm[] = { fTileModeX, fTileModeY };

    // Must set wrap and filter on the sampler before requesting a texture. In two places below
    // we check the matrix scale factors to determine how to interpret the filter quality setting.
    // This completely ignores the complexity of the drawVertices case where explicit local coords
    // are provided by the caller.
    bool doBicubic;
    GrTextureParams::FilterMode textureFilterMode =
        GrSkFilterQualityToGrFilterMode(filterQuality, viewM, this->getLocalMatrix(), &doBicubic);
    GrTextureParams params(tm, textureFilterMode);

    SkImageUsageType usageType;
    if (kClamp_TileMode == fTileModeX && kClamp_TileMode == fTileModeY) {
        usageType = kUntiled_SkImageUsageType;
    } else if (GrTextureParams::kNone_FilterMode == textureFilterMode) {
        usageType = kTiled_Unfiltered_SkImageUsageType;
    } else {
        usageType = kTiled_Filtered_SkImageUsageType;
    }

    SkAutoTUnref<GrTexture> texture(as_IB(fImage)->asTextureRef(context, usageType));
    if (!texture) {
        return nullptr;
    }

    SkAutoTUnref<GrFragmentProcessor> inner;
    if (doBicubic) {
        inner.reset(GrBicubicEffect::Create(mgr, texture, matrix, tm));
    } else {
        inner.reset(GrSimpleTextureEffect::Create(mgr, texture, matrix, params));
    }

    if (GrPixelConfigIsAlphaOnly(texture->config())) {
        return SkRef(inner.get());
    }
    return GrFragmentProcessor::MulOuputByInputAlpha(inner);
}

bool SkBitmapProcShader::asFragmentProcessor(GrContext* context, const SkPaint& paint,
                                             const SkMatrix& viewM,
                                             const SkMatrix* localMatrix, GrColor* paintColor,
                                             GrProcessorDataManager* procDataManager,
                                             GrFragmentProcessor** fp) const {
    SkMatrix matrix;
    matrix.setIDiv(fRawBitmap.width(), fRawBitmap.height());

    SkMatrix lmInverse;
    if (!this->getLocalMatrix().invert(&lmInverse)) {
        return false;
    }
    if (localMatrix) {
        SkMatrix inv;
        if (!localMatrix->invert(&inv)) {
            return false;
        }
        lmInverse.postConcat(inv);
    }
    matrix.preConcat(lmInverse);

    SkShader::TileMode tm[] = {
        (TileMode)fTileModeX,
        (TileMode)fTileModeY,
    };

    // Must set wrap and filter on the sampler before requesting a texture. In two places below
    // we check the matrix scale factors to determine how to interpret the filter quality setting.
    // This completely ignores the complexity of the drawVertices case where explicit local coords
    // are provided by the caller.
    bool doBicubic;
    GrTextureParams::FilterMode textureFilterMode =
            GrSkFilterQualityToGrFilterMode(paint.getFilterQuality(), viewM, this->getLocalMatrix(),
                                            &doBicubic);
    GrTextureParams params(tm, textureFilterMode);
    SkAutoTUnref<GrTexture> texture(GrRefCachedBitmapTexture(context, fRawBitmap, &params));

    if (!texture) {
        SkErrorInternals::SetError( kInternalError_SkError,
                                    "Couldn't convert bitmap to texture.");
        return false;
    }

    *paintColor = (kAlpha_8_SkColorType == fRawBitmap.colorType()) ?
                                                SkColor2GrColor(paint.getColor()) :
                                                SkColor2GrColorJustAlpha(paint.getColor());

    if (doBicubic) {
        *fp = GrBicubicEffect::Create(procDataManager, texture, matrix, tm);
    } else {
        *fp = GrSimpleTextureEffect::Create(procDataManager, texture, matrix, params);
    }

    return true;
}

////////////////////////////////////////////////////////////////////////////////
// set up the draw state to enable the aa clipping mask. Besides setting up the
// stage matrix this also alters the vertex layout
static const GrFragmentProcessor* create_fp_for_mask(GrTexture* result, const SkIRect &devBound) {
    SkMatrix mat;
    // We use device coords to compute the texture coordinates. We set our matrix to be a
    // translation to the devBound, and then a scaling matrix to normalized coords.
    mat.setIDiv(result->width(), result->height());
    mat.preTranslate(SkIntToScalar(-devBound.fLeft),
                     SkIntToScalar(-devBound.fTop));

    SkIRect domainTexels = SkIRect::MakeWH(devBound.width(), devBound.height());
    return GrTextureDomainEffect::Create(result,
                                         mat,
                                         GrTextureDomain::MakeTexelDomain(result, domainTexels),
                                         GrTextureDomain::kDecal_Mode,
                                         GrTextureParams::kNone_FilterMode,
                                         kDevice_GrCoordSet);
}

sk_sp<GrFragmentProcessor> SkImageShader::asFragmentProcessor(const AsFPArgs& args) const {
    SkMatrix matrix;
    matrix.setIDiv(fImage->width(), fImage->height());

    SkMatrix lmInverse;
    if (!this->getLocalMatrix().invert(&lmInverse)) {
        return nullptr;
    }
    if (args.fLocalMatrix) {
        SkMatrix inv;
        if (!args.fLocalMatrix->invert(&inv)) {
            return nullptr;
        }
        lmInverse.postConcat(inv);
    }
    matrix.preConcat(lmInverse);

    SkShader::TileMode tm[] = { fTileModeX, fTileModeY };

    // Must set wrap and filter on the sampler before requesting a texture. In two places below
    // we check the matrix scale factors to determine how to interpret the filter quality setting.
    // This completely ignores the complexity of the drawVertices case where explicit local coords
    // are provided by the caller.
    bool doBicubic;
    GrTextureParams::FilterMode textureFilterMode =
        GrSkFilterQualityToGrFilterMode(args.fFilterQuality, *args.fViewMatrix, this->getLocalMatrix(),
                                        &doBicubic);
    GrTextureParams params(tm, textureFilterMode);
    SkAutoTUnref<GrTexture> texture(as_IB(fImage)->asTextureRef(args.fContext, params,
                                    args.fGammaTreatment));
    if (!texture) {
        return nullptr;
    }

    sk_sp<GrFragmentProcessor> inner;
    if (doBicubic) {
        inner = GrBicubicEffect::Make(texture, nullptr, matrix, tm);
    } else {
        inner = GrSimpleTextureEffect::Make(texture, nullptr, matrix, params);
    }

    if (GrPixelConfigIsAlphaOnly(texture->config())) {
        return inner;
    }
    return sk_sp<GrFragmentProcessor>(GrFragmentProcessor::MulOutputByInputAlpha(std::move(inner)));
}

void GrSWMaskHelper::DrawToTargetWithPathMask(GrTexture* texture,
                                              GrDrawContext* drawContext,
                                              const GrPaint* paint,
                                              const GrUserStencilSettings* userStencilSettings,
                                              const GrClip& clip,
                                              GrColor color,
                                              const SkMatrix& viewMatrix,
                                              const SkIRect& rect) {
    SkMatrix invert;
    if (!viewMatrix.invert(&invert)) {
        return;
    }

    SkRect dstRect = SkRect::MakeLTRB(SK_Scalar1 * rect.fLeft,
                                      SK_Scalar1 * rect.fTop,
                                      SK_Scalar1 * rect.fRight,
                                      SK_Scalar1 * rect.fBottom);

    // We use device coords to compute the texture coordinates. We take the device coords and apply
    // a translation so that the top-left of the device bounds maps to 0,0, and then a scaling
    // matrix to normalized coords.
    SkMatrix maskMatrix;
    maskMatrix.setIDiv(texture->width(), texture->height());
    maskMatrix.preTranslate(SkIntToScalar(-rect.fLeft), SkIntToScalar(-rect.fTop));

    GrPipelineBuilder pipelineBuilder(*paint, drawContext->isUnifiedMultisampled());
    pipelineBuilder.setRenderTarget(drawContext->accessRenderTarget());
    pipelineBuilder.setUserStencil(userStencilSettings);

    pipelineBuilder.addCoverageFragmentProcessor(
                         GrSimpleTextureEffect::Create(texture,
                                                       maskMatrix,
                                                       GrTextureParams::kNone_FilterMode,
                                                       kDevice_GrCoordSet))->unref();

    SkAutoTUnref<GrDrawBatch> batch(GrRectBatchFactory::CreateNonAAFill(color, SkMatrix::I(),
                                                                        dstRect, nullptr, &invert));
    drawContext->drawBatch(pipelineBuilder, clip, batch);
}

GrTexture* GaussianBlur(GrContext* context,
                        GrTexture* srcTexture,
                        bool canClobberSrc,
                        const SkRect& rect,
                        bool cropToRect,
                        float sigmaX,
                        float sigmaY) {
    SkASSERT(NULL != context);

    GrContext::AutoRenderTarget art(context);

    GrContext::AutoMatrix am;
    am.setIdentity(context);

    SkIRect clearRect;
    int scaleFactorX, radiusX;
    int scaleFactorY, radiusY;
    sigmaX = adjust_sigma(sigmaX, &scaleFactorX, &radiusX);
    sigmaY = adjust_sigma(sigmaY, &scaleFactorY, &radiusY);

    SkRect srcRect(rect);
    scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
    srcRect.roundOut();
    scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                         static_cast<float>(scaleFactorY));

    GrContext::AutoClip acs(context, SkRect::MakeWH(srcRect.width(), srcRect.height()));

    SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
             kRGBA_8888_GrPixelConfig == srcTexture->config() ||
             kAlpha_8_GrPixelConfig == srcTexture->config());

    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
    desc.fWidth = SkScalarFloorToInt(srcRect.width());
    desc.fHeight = SkScalarFloorToInt(srcRect.height());
    desc.fConfig = srcTexture->config();

    GrAutoScratchTexture temp1, temp2;
    GrTexture* dstTexture = temp1.set(context, desc);
    GrTexture* tempTexture = canClobberSrc ? srcTexture : temp2.set(context, desc);
    if (NULL == dstTexture || NULL == tempTexture) {
        return NULL;
    }

    for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
        GrPaint paint;
        SkMatrix matrix;
        matrix.setIDiv(srcTexture->width(), srcTexture->height());
        context->setRenderTarget(dstTexture->asRenderTarget());
        SkRect dstRect(srcRect);
        if (cropToRect && i == 1) {
            dstRect.offset(-dstRect.fLeft, -dstRect.fTop);
            SkRect domain;
            matrix.mapRect(&domain, rect);
            domain.inset(i < scaleFactorX ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                         i < scaleFactorY ? SK_ScalarHalf / srcTexture->height() : 0.0f);
            SkAutoTUnref<GrEffectRef> effect(GrTextureDomainEffect::Create(
                srcTexture,
                matrix,
                domain,
                GrTextureDomainEffect::kDecal_WrapMode,
                GrTextureParams::kBilerp_FilterMode));
            paint.addColorEffect(effect);
        } else {
            GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
            paint.addColorTextureEffect(srcTexture, matrix, params);
        }
        scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                             i < scaleFactorY ? 0.5f : 1.0f);
        context->drawRectToRect(paint, dstRect, srcRect);
        srcRect = dstRect;
        srcTexture = dstTexture;
        SkTSwap(dstTexture, tempTexture);
    }

    SkIRect srcIRect;
    srcRect.roundOut(&srcIRect);

    if (sigmaX > 0.0f) {
        if (scaleFactorX > 1) {
            // Clear out a radius to the right of the srcRect to prevent the
            // X convolution from reading garbage.
            clearRect = SkIRect::MakeXYWH(srcIRect.fRight, srcIRect.fTop,
                                          radiusX, srcIRect.height());
            context->clear(&clearRect, 0x0, false);
        }
        context->setRenderTarget(dstTexture->asRenderTarget());
        SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
        convolve_gaussian(context, srcRect, dstRect, srcTexture,
                          Gr1DKernelEffect::kX_Direction, radiusX, sigmaX, cropToRect);
        srcTexture = dstTexture;
        srcRect = dstRect;
        SkTSwap(dstTexture, tempTexture);
    }

    if (sigmaY > 0.0f) {
        if (scaleFactorY > 1 || sigmaX > 0.0f) {
            // Clear out a radius below the srcRect to prevent the Y
            // convolution from reading garbage.
//.........这里部分代码省略.........

GrTexture* GaussianBlur(GrContext* context,
                        GrTexture* srcTexture,
                        bool canClobberSrc,
                        const SkRect& dstBounds,
                        const SkRect* srcBounds,
                        float sigmaX,
                        float sigmaY,
                        GrTextureProvider::SizeConstraint constraint) {
    SkASSERT(context);
    SkIRect clearRect;
    int scaleFactorX, radiusX;
    int scaleFactorY, radiusY;
    int maxTextureSize = context->caps()->maxTextureSize();
    sigmaX = adjust_sigma(sigmaX, maxTextureSize, &scaleFactorX, &radiusX);
    sigmaY = adjust_sigma(sigmaY, maxTextureSize, &scaleFactorY, &radiusY);

    SkPoint srcOffset = SkPoint::Make(-dstBounds.x(), -dstBounds.y());
    SkRect localDstBounds = SkRect::MakeWH(dstBounds.width(), dstBounds.height());
    SkRect localSrcBounds;
    SkRect srcRect;
    if (srcBounds) {
        srcRect = localSrcBounds = *srcBounds;
        srcRect.offset(srcOffset);
        srcBounds = &localSrcBounds;
    } else {
        srcRect = localDstBounds;
    }

    scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
    srcRect.roundOut(&srcRect);
    scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                         static_cast<float>(scaleFactorY));

    // setup new clip
    GrClip clip(localDstBounds);

    SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
             kRGBA_8888_GrPixelConfig == srcTexture->config() ||
             kAlpha_8_GrPixelConfig == srcTexture->config());

    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = SkScalarFloorToInt(dstBounds.width());
    desc.fHeight = SkScalarFloorToInt(dstBounds.height());
    desc.fConfig = srcTexture->config();

    GrTexture* dstTexture;
    GrTexture* tempTexture;
    SkAutoTUnref<GrTexture> temp1, temp2;

    temp1.reset(context->textureProvider()->createTexture(desc, constraint));
    dstTexture = temp1.get();
    if (canClobberSrc) {
        tempTexture = srcTexture;
    } else {
        temp2.reset(context->textureProvider()->createTexture(desc, constraint));
        tempTexture = temp2.get();
    }

    if (nullptr == dstTexture || nullptr == tempTexture) {
        return nullptr;
    }

    SkAutoTUnref<GrDrawContext> srcDrawContext;

    for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
        GrPaint paint;
        SkMatrix matrix;
        matrix.setIDiv(srcTexture->width(), srcTexture->height());
        SkRect dstRect(srcRect);
        if (srcBounds && i == 1) {
            SkRect domain;
            matrix.mapRect(&domain, *srcBounds);
            domain.inset((i < scaleFactorX) ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                         (i < scaleFactorY) ? SK_ScalarHalf / srcTexture->height() : 0.0f);
            SkAutoTUnref<const GrFragmentProcessor> fp(GrTextureDomainEffect::Create(
                srcTexture,
                matrix,
                domain,
                GrTextureDomain::kDecal_Mode,
                GrTextureParams::kBilerp_FilterMode));
            paint.addColorFragmentProcessor(fp);
            srcRect.offset(-srcOffset);
            srcOffset.set(0, 0);
        } else {
            GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
            paint.addColorTextureProcessor(srcTexture, matrix, params);
        }
        paint.setPorterDuffXPFactory(SkXfermode::kSrc_Mode);
        scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                             i < scaleFactorY ? 0.5f : 1.0f);

        SkAutoTUnref<GrDrawContext> dstDrawContext(
                                             context->drawContext(dstTexture->asRenderTarget()));
        if (!dstDrawContext) {
            return nullptr;
        }
        dstDrawContext->fillRectToRect(clip, paint, SkMatrix::I(), dstRect, srcRect);

        srcDrawContext.swap(dstDrawContext);
//.........这里部分代码省略.........

GrTexture* GaussianBlur(GrContext* context,
                        GrTexture* srcTexture,
                        bool canClobberSrc,
                        const SkRect& rect,
                        bool cropToRect,
                        float sigmaX,
                        float sigmaY) {
    SkASSERT(context);

    SkIRect clearRect;
    int scaleFactorX, radiusX;
    int scaleFactorY, radiusY;
    int maxTextureSize = context->caps()->maxTextureSize();
    sigmaX = adjust_sigma(sigmaX, maxTextureSize, &scaleFactorX, &radiusX);
    sigmaY = adjust_sigma(sigmaY, maxTextureSize, &scaleFactorY, &radiusY);

    SkRect srcRect(rect);
    scale_rect(&srcRect, 1.0f / scaleFactorX, 1.0f / scaleFactorY);
    srcRect.roundOut(&srcRect);
    scale_rect(&srcRect, static_cast<float>(scaleFactorX),
                         static_cast<float>(scaleFactorY));

    // setup new clip
    GrClip clip(SkRect::MakeWH(srcRect.width(), srcRect.height()));

    SkASSERT(kBGRA_8888_GrPixelConfig == srcTexture->config() ||
             kRGBA_8888_GrPixelConfig == srcTexture->config() ||
             kAlpha_8_GrPixelConfig == srcTexture->config());

    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = SkScalarFloorToInt(srcRect.width());
    desc.fHeight = SkScalarFloorToInt(srcRect.height());
    desc.fConfig = srcTexture->config();

    GrTexture* dstTexture;
    GrTexture* tempTexture;
    SkAutoTUnref<GrTexture> temp1, temp2;

    temp1.reset(context->textureProvider()->refScratchTexture(
        desc, GrTextureProvider::kApprox_ScratchTexMatch));
    dstTexture = temp1.get();
    if (canClobberSrc) {
        tempTexture = srcTexture;
    } else {
        temp2.reset(context->textureProvider()->refScratchTexture(
            desc, GrTextureProvider::kApprox_ScratchTexMatch));
        tempTexture = temp2.get();
    }

    if (NULL == dstTexture || NULL == tempTexture) {
        return NULL;
    }

    GrDrawContext* drawContext = context->drawContext();
    if (!drawContext) {
        return NULL;
    }

    for (int i = 1; i < scaleFactorX || i < scaleFactorY; i *= 2) {
        GrPaint paint;
        SkMatrix matrix;
        matrix.setIDiv(srcTexture->width(), srcTexture->height());
        SkRect dstRect(srcRect);
        if (cropToRect && i == 1) {
            dstRect.offset(-dstRect.fLeft, -dstRect.fTop);
            SkRect domain;
            matrix.mapRect(&domain, rect);
            domain.inset(i < scaleFactorX ? SK_ScalarHalf / srcTexture->width() : 0.0f,
                         i < scaleFactorY ? SK_ScalarHalf / srcTexture->height() : 0.0f);
            SkAutoTUnref<GrFragmentProcessor> fp(   GrTextureDomainEffect::Create(
                paint.getProcessorDataManager(),
                srcTexture,
                matrix,
                domain,
                GrTextureDomain::kDecal_Mode,
                GrTextureParams::kBilerp_FilterMode));
            paint.addColorProcessor(fp);
        } else {
            GrTextureParams params(SkShader::kClamp_TileMode, GrTextureParams::kBilerp_FilterMode);
            paint.addColorTextureProcessor(srcTexture, matrix, params);
        }
        scale_rect(&dstRect, i < scaleFactorX ? 0.5f : 1.0f,
                             i < scaleFactorY ? 0.5f : 1.0f);
        drawContext->drawNonAARectToRect(dstTexture->asRenderTarget(), clip, paint, SkMatrix::I(),
                                         dstRect, srcRect);
        srcRect = dstRect;
        srcTexture = dstTexture;
        SkTSwap(dstTexture, tempTexture);
    }

    const SkIRect srcIRect = srcRect.roundOut();

    // For really small blurs(Certainly no wider than 5x5 on desktop gpus) it is faster to just
    // launch a single non separable kernel vs two launches
    if (sigmaX > 0.0f && sigmaY > 0 &&
            (2 * radiusX + 1) * (2 * radiusY + 1) <= MAX_KERNEL_SIZE) {
        // We shouldn't be scaling because this is a small size blur
        SkASSERT((scaleFactorX == scaleFactorY) == 1);
        SkRect dstRect = SkRect::MakeWH(srcRect.width(), srcRect.height());
//.........这里部分代码省略.........

bool SkXfermodeImageFilter::filterImageGPUDeprecated(Proxy* proxy,
                                                     const SkBitmap& src,
                                                     const Context& ctx,
                                                     SkBitmap* result,
                                                     SkIPoint* offset) const {
    GrContext* context = nullptr;
    SkBitmap background = src;
    SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
    if (!this->filterInputGPUDeprecated(0, proxy, src, ctx, &background, &backgroundOffset)) {
        background.reset();
    }
    GrTexture* backgroundTex = background.getTexture();
    if (backgroundTex) {
        context = backgroundTex->getContext();
    }

    SkBitmap foreground = src;
    SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
    if (!this->filterInputGPUDeprecated(1, proxy, src, ctx, &foreground, &foregroundOffset)) {
        foreground.reset();
    }
    GrTexture* foregroundTex = foreground.getTexture();
    if (foregroundTex) {
        context = foregroundTex->getContext();
    }

    if (!context) {
        return false;
    }

    SkIRect bounds = background.bounds().makeOffset(backgroundOffset.x(), backgroundOffset.y());
    bounds.join(foreground.bounds().makeOffset(foregroundOffset.x(), foregroundOffset.y()));
    if (bounds.isEmpty()) {
        return false;
    }

    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = bounds.width();
    desc.fHeight = bounds.height();
    desc.fConfig = kSkia8888_GrPixelConfig;
    SkAutoTUnref<GrTexture> dst(context->textureProvider()->createApproxTexture(desc));
    if (!dst) {
        return false;
    }

    GrPaint paint;
    SkAutoTUnref<const GrFragmentProcessor> bgFP;

    if (backgroundTex) {
        SkMatrix backgroundMatrix;
        backgroundMatrix.setIDiv(backgroundTex->width(), backgroundTex->height());
        backgroundMatrix.preTranslate(SkIntToScalar(-backgroundOffset.fX),
                                      SkIntToScalar(-backgroundOffset.fY));
        bgFP.reset(GrTextureDomainEffect::Create(
                            backgroundTex, backgroundMatrix,
                            GrTextureDomain::MakeTexelDomain(backgroundTex, background.bounds()),
                            GrTextureDomain::kDecal_Mode,
                            GrTextureParams::kNone_FilterMode));
    } else {
        bgFP.reset(GrConstColorProcessor::Create(GrColor_TRANSPARENT_BLACK,
                                                 GrConstColorProcessor::kIgnore_InputMode));
    }

    if (foregroundTex) {
        SkMatrix foregroundMatrix;
        foregroundMatrix.setIDiv(foregroundTex->width(), foregroundTex->height());
        foregroundMatrix.preTranslate(SkIntToScalar(-foregroundOffset.fX),
                                      SkIntToScalar(-foregroundOffset.fY));

        SkAutoTUnref<const GrFragmentProcessor> foregroundFP;

        foregroundFP.reset(GrTextureDomainEffect::Create(
                            foregroundTex, foregroundMatrix,
                            GrTextureDomain::MakeTexelDomain(foregroundTex, foreground.bounds()),
                            GrTextureDomain::kDecal_Mode,
                            GrTextureParams::kNone_FilterMode));

        paint.addColorFragmentProcessor(foregroundFP.get());

        // A null fMode is interpreted to mean kSrcOver_Mode (to match raster).
        SkAutoTUnref<SkXfermode> mode(SkSafeRef(fMode.get()));
        if (!mode) {
            // It would be awesome to use SkXfermode::Create here but it knows better
            // than us and won't return a kSrcOver_Mode SkXfermode. That means we
            // have to get one the hard way.
            struct ProcCoeff rec;
            rec.fProc = SkXfermode::GetProc(SkXfermode::kSrcOver_Mode);
            SkXfermode::ModeAsCoeff(SkXfermode::kSrcOver_Mode, &rec.fSC, &rec.fDC);

            mode.reset(new SkProcCoeffXfermode(rec, SkXfermode::kSrcOver_Mode));
        }

        SkAutoTUnref<const GrFragmentProcessor> xferFP(mode->getFragmentProcessorForImageFilter(bgFP));

        // A null 'xferFP' here means kSrc_Mode was used in which case we can just proceed
        if (xferFP) {
            paint.addColorFragmentProcessor(xferFP);
        }
    } else {
//.........这里部分代码省略.........