C++ GrPaint::addColorTextureEffect方法代码示例

bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
                                           const SkBitmap& src,
                                           const Context& ctx,
                                           SkBitmap* result,
                                           SkIPoint* offset) const {
    SkBitmap background = src;
    SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
    if (getInput(0) && !getInput(0)->getInputResultGPU(proxy, src, ctx, &background,
                                                       &backgroundOffset)) {
        return onFilterImage(proxy, src, ctx, result, offset);
    }
    GrTexture* backgroundTex = background.getTexture();
    SkBitmap foreground = src;
    SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
    if (getInput(1) && !getInput(1)->getInputResultGPU(proxy, src, ctx, &foreground,
                                                       &foregroundOffset)) {
        return onFilterImage(proxy, src, ctx, result, offset);
    }
    GrTexture* foregroundTex = foreground.getTexture();
    GrContext* context = foregroundTex->getContext();

    GrEffect* xferEffect = NULL;

    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
    desc.fWidth = src.width();
    desc.fHeight = src.height();
    desc.fConfig = kSkia8888_GrPixelConfig;

    GrAutoScratchTexture ast(context, desc);
    SkAutoTUnref<GrTexture> dst(ast.detach());

    GrContext::AutoRenderTarget art(context, dst->asRenderTarget());

    if (!fMode || !fMode->asNewEffect(&xferEffect, backgroundTex)) {
        // canFilterImageGPU() should've taken care of this
        SkASSERT(false);
        return false;
    }

    SkMatrix foregroundMatrix = GrEffect::MakeDivByTextureWHMatrix(foregroundTex);
    foregroundMatrix.preTranslate(SkIntToScalar(backgroundOffset.fX-foregroundOffset.fX),
                                  SkIntToScalar(backgroundOffset.fY-foregroundOffset.fY));


    SkRect srcRect;
    src.getBounds(&srcRect);

    GrPaint paint;
    paint.addColorTextureEffect(foregroundTex, foregroundMatrix);
    paint.addColorEffect(xferEffect)->unref();
    context->drawRect(paint, srcRect);

    offset->fX = backgroundOffset.fX;
    offset->fY = backgroundOffset.fY;
    WrapTexture(dst, src.width(), src.height(), result);
    return true;
}

    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));
            }
        }
    }

bool SkXfermodeImageFilter::filterImageGPU(Proxy* proxy,
                                           const SkBitmap& src,
                                           const SkMatrix& ctm,
                                           SkBitmap* result,
                                           SkIPoint* offset) {
    SkBitmap background;
    SkIPoint backgroundOffset = SkIPoint::Make(0, 0);
    if (!SkImageFilterUtils::GetInputResultGPU(getInput(0), proxy, src, ctm, &background,
                                               &backgroundOffset)) {
        return false;
    }
    GrTexture* backgroundTex = background.getTexture();
    SkBitmap foreground;
    SkIPoint foregroundOffset = SkIPoint::Make(0, 0);
    if (!SkImageFilterUtils::GetInputResultGPU(getInput(1), proxy, src, ctm, &foreground,
                                               &foregroundOffset)) {
        return false;
    }
    GrTexture* foregroundTex = foreground.getTexture();
    GrContext* context = foregroundTex->getContext();

    GrEffectRef* xferEffect = NULL;

    GrTextureDesc desc;
    desc.fFlags = kRenderTarget_GrTextureFlagBit | kNoStencil_GrTextureFlagBit;
    desc.fWidth = src.width();
    desc.fHeight = src.height();
    desc.fConfig = kSkia8888_GrPixelConfig;

    GrAutoScratchTexture ast(context, desc);
    SkAutoTUnref<GrTexture> dst(ast.detach());

    GrContext::AutoRenderTarget art(context, dst->asRenderTarget());

    SkXfermode::Coeff sm, dm;
    if (!SkXfermode::AsNewEffectOrCoeff(fMode, &xferEffect, &sm, &dm, backgroundTex)) {
        return false;
    }

    SkMatrix foregroundMatrix = GrEffect::MakeDivByTextureWHMatrix(foregroundTex);
    foregroundMatrix.preTranslate(SkIntToScalar(backgroundOffset.fX-foregroundOffset.fX),
                                  SkIntToScalar(backgroundOffset.fY-foregroundOffset.fY));


    SkRect srcRect;
    src.getBounds(&srcRect);
    if (NULL != xferEffect) {
        GrPaint paint;
        paint.addColorTextureEffect(foregroundTex, foregroundMatrix);
        paint.addColorEffect(xferEffect)->unref();
        context->drawRect(paint, srcRect);
    } else {
        GrPaint backgroundPaint;
        SkMatrix backgroundMatrix = GrEffect::MakeDivByTextureWHMatrix(backgroundTex);
        backgroundPaint.addColorTextureEffect(backgroundTex, backgroundMatrix);
        context->drawRect(backgroundPaint, srcRect);

        GrPaint foregroundPaint;
        foregroundPaint.setBlendFunc(sk_blend_to_grblend(sm), sk_blend_to_grblend(dm));
        foregroundPaint.addColorTextureEffect(foregroundTex, foregroundMatrix);
        context->drawRect(foregroundPaint, srcRect);
    }
    offset->fX += backgroundOffset.fX;
    offset->fY += backgroundOffset.fY;
    return SkImageFilterUtils::WrapTexture(dst, src.width(), src.height(), result);
}

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.........