C++ SkMatrix::postIDiv方法代码示例

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);
}

bool GrDrawTarget::onCopySurface(GrSurface* dst,
                                 GrSurface* src,
                                 const SkIRect& srcRect,
                                 const SkIPoint& dstPoint) {
    if (!GrDrawTarget::onCanCopySurface(dst, src, srcRect, dstPoint)) {
        return false;
    }

    GrRenderTarget* rt = dst->asRenderTarget();
    GrTexture* tex = src->asTexture();

    GrDrawTarget::AutoStateRestore asr(this, kReset_ASRInit);
    this->drawState()->setRenderTarget(rt);
    SkMatrix matrix;
    matrix.setTranslate(SkIntToScalar(srcRect.fLeft - dstPoint.fX),
                        SkIntToScalar(srcRect.fTop - dstPoint.fY));
    matrix.postIDiv(tex->width(), tex->height());
    this->drawState()->addColorTextureEffect(tex, matrix);
    SkIRect dstRect = SkIRect::MakeXYWH(dstPoint.fX,
                                        dstPoint.fY,
                                        srcRect.width(),
                                        srcRect.height());
    this->drawSimpleRect(dstRect);
    return true;
}

sk_sp<GrFragmentProcessor> GrTextureMaker::createFragmentProcessor(
                                        const SkMatrix& textureMatrix,
                                        const SkRect& constraintRect,
                                        FilterConstraint filterConstraint,
                                        bool coordsLimitedToConstraintRect,
                                        const GrTextureParams::FilterMode* filterOrNullForBicubic,
                                        SkColorSpace* dstColorSpace,
                                        SkSourceGammaTreatment gammaTreatment) {

    const GrTextureParams::FilterMode* fmForDetermineDomain = filterOrNullForBicubic;
    if (filterOrNullForBicubic && GrTextureParams::kMipMap_FilterMode == *filterOrNullForBicubic &&
        kYes_FilterConstraint == filterConstraint) {
        // TODo: Here we should force a copy restricted to the constraintRect since MIP maps will
        // read outside the constraint rect. However, as in the adjuster case, we aren't currently
        // doing that.
        // We instead we compute the domain as though were bilerping which is only correct if we
        // only sample level 0.
        static const GrTextureParams::FilterMode kBilerp = GrTextureParams::kBilerp_FilterMode;
        fmForDetermineDomain = &kBilerp;
    }

    GrTextureParams params;
    if (filterOrNullForBicubic) {
        params.reset(SkShader::kClamp_TileMode, *filterOrNullForBicubic);
    } else {
        // Bicubic doesn't use filtering for it's texture accesses.
        params.reset(SkShader::kClamp_TileMode, GrTextureParams::kNone_FilterMode);
    }
    SkAutoTUnref<GrTexture> texture(this->refTextureForParams(params, gammaTreatment));
    if (!texture) {
        return nullptr;
    }
    SkRect domain;
    DomainMode domainMode =
        determine_domain_mode(constraintRect, filterConstraint, coordsLimitedToConstraintRect,
                              texture->width(), texture->height(), nullptr, fmForDetermineDomain,
                              &domain);
    SkASSERT(kTightCopy_DomainMode != domainMode);
    SkMatrix normalizedTextureMatrix = textureMatrix;
    normalizedTextureMatrix.postIDiv(texture->width(), texture->height());
    sk_sp<GrColorSpaceXform> colorSpaceXform = GrColorSpaceXform::Make(this->getColorSpace(),
                                                                       dstColorSpace);
    return create_fp_for_domain_and_filter(texture, std::move(colorSpaceXform),
                                           normalizedTextureMatrix, domainMode, domain,
                                           filterOrNullForBicubic);
}

bool GrDrawTarget::copySurface(GrSurface* dst,
                               GrSurface* src,
                               const SkIRect& srcRect,
                               const SkIPoint& dstPoint) {
    SkASSERT(dst);
    SkASSERT(src);

    SkIRect clippedSrcRect;
    SkIPoint clippedDstPoint;
    // If the rect is outside the src or dst then we've already succeeded.
    if (!clip_srcrect_and_dstpoint(dst,
                                   src,
                                   srcRect,
                                   dstPoint,
                                   &clippedSrcRect,
                                   &clippedDstPoint)) {
        return true;
    }

    if (this->onCopySurface(dst, src, clippedSrcRect, clippedDstPoint)) {
        return true;
    }

    GrRenderTarget* rt = dst->asRenderTarget();
    GrTexture* tex = src->asTexture();

    if ((dst == src) || !rt || !tex) {
        return false;
    }

    GrPipelineBuilder pipelineBuilder;
    pipelineBuilder.setRenderTarget(rt);
    SkMatrix matrix;
    matrix.setTranslate(SkIntToScalar(clippedSrcRect.fLeft - clippedDstPoint.fX),
                        SkIntToScalar(clippedSrcRect.fTop - clippedDstPoint.fY));
    matrix.postIDiv(tex->width(), tex->height());
    pipelineBuilder.addColorTextureProcessor(tex, matrix);
    SkIRect dstRect = SkIRect::MakeXYWH(clippedDstPoint.fX,
                                        clippedDstPoint.fY,
                                        clippedSrcRect.width(),
                                        clippedSrcRect.height());
    this->drawSimpleRect(&pipelineBuilder, GrColor_WHITE, SkMatrix::I(), dstRect);
    return true;
}

// Draw a mask using the supplied paint. Since the coverage/geometry
// is already burnt into the mask this boils down to a rect draw.
// Return true if the mask was successfully drawn.
static bool draw_mask(GrDrawContext* drawContext,
                      const GrClip& clip,
                      const SkMatrix& viewMatrix,
                      const SkRect& maskRect,
                      GrPaint* grp,
                      GrTexture* mask) {
    SkMatrix matrix;
    matrix.setTranslate(-maskRect.fLeft, -maskRect.fTop);
    matrix.postIDiv(mask->width(), mask->height());

    grp->addCoverageFragmentProcessor(GrSimpleTextureEffect::Create(mask, matrix,
                                                                    kDevice_GrCoordSet))->unref();

    SkMatrix inverse;
    if (!viewMatrix.invert(&inverse)) {
        return false;
    }
    drawContext->fillRectWithLocalMatrix(clip, *grp, SkMatrix::I(), maskRect, inverse);
    return true;
}

// Draw a mask using the supplied paint. Since the coverage/geometry
// is already burnt into the mask this boils down to a rect draw.
// Return true if the mask was successfully drawn.
static bool draw_mask(GrDrawContext* drawContext,
                      const GrClip& clip,
                      const SkMatrix& viewMatrix,
                      const SkIRect& maskRect,
                      GrPaint* grp,
                      GrTexture* mask) {
    SkMatrix matrix;
    matrix.setTranslate(-SkIntToScalar(maskRect.fLeft), -SkIntToScalar(maskRect.fTop));
    matrix.postIDiv(mask->width(), mask->height());
    matrix.preConcat(viewMatrix);
    grp->addCoverageFragmentProcessor(GrSimpleTextureEffect::Make(mask, nullptr, matrix));

    SkMatrix inverse;
    if (!viewMatrix.invert(&inverse)) {
        return false;
    }
    drawContext->fillRectWithLocalMatrix(clip, *grp, SkMatrix::I(), SkRect::Make(maskRect),
                                         inverse);
    return true;
}

bool GrDrawTarget::copySurface(GrSurface* dst,
                               GrSurface* src,
                               const SkIRect& srcRect,
                               const SkIPoint& dstPoint) {
    SkASSERT(dst);
    SkASSERT(src);

    SkIRect clippedSrcRect;
    SkIPoint clippedDstPoint;
    // If the rect is outside the src or dst then we've already succeeded.
    if (!clip_srcrect_and_dstpoint(dst,
                                   src,
                                   srcRect,
                                   dstPoint,
                                   &clippedSrcRect,
                                   &clippedDstPoint)) {
        SkASSERT(GrDrawTarget::canCopySurface(dst, src, srcRect, dstPoint));
        return true;
    }

    if (!GrDrawTarget::canCopySurface(dst, src, clippedSrcRect, clippedDstPoint)) {
        return false;
    }

    GrRenderTarget* rt = dst->asRenderTarget();
    GrTexture* tex = src->asTexture();

    GrDrawTarget::AutoStateRestore asr(this, kReset_ASRInit);
    this->drawState()->setRenderTarget(rt);
    SkMatrix matrix;
    matrix.setTranslate(SkIntToScalar(clippedSrcRect.fLeft - clippedDstPoint.fX),
                        SkIntToScalar(clippedSrcRect.fTop - clippedDstPoint.fY));
    matrix.postIDiv(tex->width(), tex->height());
    this->drawState()->addColorTextureProcessor(tex, matrix);
    SkIRect dstRect = SkIRect::MakeXYWH(clippedDstPoint.fX,
                                        clippedDstPoint.fY,
                                        clippedSrcRect.width(),
                                        clippedSrcRect.height());
    this->drawSimpleRect(dstRect);
    return true;
}

SkMatrix GrGLSLPrimitiveProcessor::GetTransformMatrix(const SkMatrix& localMatrix,
                                                      const GrCoordTransform& coordTransform) {
    SkMatrix combined;
    combined.setConcat(coordTransform.getMatrix(), localMatrix);
    if (coordTransform.normalize()) {
        combined.postIDiv(coordTransform.peekTexture()->width(),
                          coordTransform.peekTexture()->height());
    }

    if (coordTransform.reverseY()) {
        // combined.postScale(1,-1);
        // combined.postTranslate(0,1);
        combined.set(SkMatrix::kMSkewY,
            combined[SkMatrix::kMPersp0] - combined[SkMatrix::kMSkewY]);
        combined.set(SkMatrix::kMScaleY,
            combined[SkMatrix::kMPersp1] - combined[SkMatrix::kMScaleY]);
        combined.set(SkMatrix::kMTransY,
            combined[SkMatrix::kMPersp2] - combined[SkMatrix::kMTransY]);
    }
    return combined;
}

    virtual void onDraw(SkCanvas* canvas) {
        SkBaseDevice* device = canvas->getTopDevice();
        GrRenderTarget* target = device->accessRenderTarget();
        GrContext* ctx = GetGr();
        if (ctx && target) {
            SkPMColor gTextureData[(2 * S) * (2 * S)];
            static const int stride = 2 * S;
            static const SkPMColor gray  = SkPackARGB32(0x40, 0x40, 0x40, 0x40);
            static const SkPMColor white = SkPackARGB32(0xff, 0xff, 0xff, 0xff);
            static const SkPMColor red   = SkPackARGB32(0x80, 0x80, 0x00, 0x00);
            static const SkPMColor blue  = SkPackARGB32(0x80, 0x00, 0x00, 0x80);
            static const SkPMColor green = SkPackARGB32(0x80, 0x00, 0x80, 0x00);
            static const SkPMColor black = SkPackARGB32(0x00, 0x00, 0x00, 0x00);
            for (int i = 0; i < 2; ++i) {
                int offset = 0;
                // fill upper-left
                for (int y = 0; y < S; ++y) {
                    for (int x = 0; x < S; ++x) {
                        gTextureData[offset + y * stride + x] = gray;
                    }
                }
                // fill upper-right
                offset = S;
                for (int y = 0; y < S; ++y) {
                    for (int x = 0; x < S; ++x) {
                        gTextureData[offset + y * stride + x] = white;
                    }
                }
                // fill lower left
                offset = S * stride;
                for (int y = 0; y < S; ++y) {
                    for (int x = 0; x < S; ++x) {
                        gTextureData[offset + y * stride + x] = black;
                    }
                }
                // fill lower right
                offset = S * stride + S;
                for (int y = 0; y < S; ++y) {
                    for (int x = 0; x < S; ++x) {
                        gTextureData[offset + y * stride + x] = gray;
                    }
                }

                GrTextureDesc desc;
                // use RT flag bit because in GL it makes the texture be bottom-up
                desc.fFlags     = i ? kRenderTarget_GrTextureFlagBit :
                                      kNone_GrTextureFlags;
                desc.fConfig    = kSkia8888_GrPixelConfig;
                desc.fWidth     = 2 * S;
                desc.fHeight    = 2 * S;
                GrTexture* texture =
                    ctx->createUncachedTexture(desc, gTextureData, 0);

                if (!texture) {
                    return;
                }
                GrAutoUnref au(texture);

                GrContext::AutoClip acs(ctx, SkRect::MakeWH(2*S, 2*S));

                ctx->setRenderTarget(target);

                GrPaint paint;
                paint.setBlendFunc(kOne_GrBlendCoeff, kISA_GrBlendCoeff);
                SkMatrix vm;
                if (i) {
                    vm.setRotate(90 * SK_Scalar1,
                                 S * SK_Scalar1,
                                 S * SK_Scalar1);
                } else {
                    vm.reset();
                }
                ctx->setMatrix(vm);
                SkMatrix tm;
                tm = vm;
                tm.postIDiv(2*S, 2*S);
                paint.addColorTextureEffect(texture, tm);

                ctx->drawRect(paint, SkRect::MakeWH(2*S, 2*S));

                // now update the lower right of the texture in first pass
                // or upper right in second pass
                offset = 0;
                for (int y = 0; y < S; ++y) {
                    for (int x = 0; x < S; ++x) {
                        gTextureData[offset + y * stride + x] =
                            ((x + y) % 2) ? (i ? green : red) : blue;
                    }
                }
                texture->writePixels(S, (i ? 0 : S), S, S,
                                     texture->config(), gTextureData,
                                     4 * stride);
                ctx->drawRect(paint, SkRect::MakeWH(2*S, 2*S));
            }
        }
    }