C++ GrTexture::config方法代码示例

static void check_texture(skiatest::Reporter* reporter,
                          GrResourceProvider* provider,
                          GrTextureProxy* texProxy,
                          SkBackingFit fit) {
    GrSurfaceProxy::UniqueID idBefore = texProxy->uniqueID();

    bool preinstantiated = texProxy->isInstantiated();
    REPORTER_ASSERT(reporter, texProxy->instantiate(provider));
    GrTexture* tex = texProxy->peekTexture();

    REPORTER_ASSERT(reporter, texProxy->uniqueID() == idBefore);
    // Deferred resources should always have a different ID from their instantiated texture
    if (preinstantiated) {
        REPORTER_ASSERT(reporter, texProxy->uniqueID().asUInt() == tex->uniqueID().asUInt());
    } else {
        REPORTER_ASSERT(reporter, texProxy->uniqueID().asUInt() != tex->uniqueID().asUInt());
    }

    if (SkBackingFit::kExact == fit) {
        REPORTER_ASSERT(reporter, tex->width() == texProxy->width());
        REPORTER_ASSERT(reporter, tex->height() == texProxy->height());
    } else {
        REPORTER_ASSERT(reporter, tex->width() >= texProxy->width());
        REPORTER_ASSERT(reporter, tex->height() >= texProxy->height());
    }
    REPORTER_ASSERT(reporter, tex->config() == texProxy->config());
}

static void add_texture_key(GrProcessorKeyBuilder* b, const GrProcessor& proc,
                            const GrGLSLCaps& caps) {
    int numTextures = proc.numTextures();
    SkASSERT(0 == proc.numBuffers());
    // Need two bytes per key (swizzle, sampler type, and precision).
    int word32Count = (proc.numTextures() + 1) / 2;
    if (0 == word32Count) {
        return;
    }
    uint16_t* k16 = SkTCast<uint16_t*>(b->add32n(word32Count));
    for (int i = 0; i < numTextures; ++i) {
        const GrTextureAccess& access = proc.textureAccess(i);
        GrTexture* texture = access.getTexture();
        k16[i] = SkToU16(caps.configTextureSwizzle(texture->config()).asKey() |
                         (caps.samplerPrecision(texture->config(), access.getVisibility()) << 8));
    }
    // zero the last 16 bits if the number of textures is odd.
    if (numTextures & 0x1) {
        k16[numTextures] = 0;
    }
}

std::unique_ptr<SkCrossContextImageData> SkCrossContextImageData::MakeFromEncoded(
        GrContext* context, sk_sp<SkData> encoded, SkColorSpace* dstColorSpace) {
    sk_sp<SkImage> codecImage = SkImage::MakeFromEncoded(std::move(encoded));
    if (!codecImage) {
        return nullptr;
    }

    // Some backends or drivers don't support (safely) moving resources between contexts
    if (!context->caps()->crossContextTextureSupport()) {
        return std::unique_ptr<SkCrossContextImageData>(
            new SkCrossContextImageData(std::move(codecImage)));
    }

    sk_sp<SkImage> textureImage = codecImage->makeTextureImage(context, dstColorSpace);
    if (!textureImage) {
        // TODO: Force decode to raster here? Do mip-mapping, like getDeferredTextureImageData?
        return std::unique_ptr<SkCrossContextImageData>(
            new SkCrossContextImageData(std::move(codecImage)));
    }

    // Crack open the gpu image, extract the backend data, stick it in the SkCCID
    GrTexture* texture = as_IB(textureImage)->peekTexture();
    SkASSERT(texture);

    GrBackendTextureDesc desc;
    desc.fFlags = kNone_GrBackendTextureFlag;
    desc.fOrigin = texture->origin();
    desc.fWidth = texture->width();
    desc.fHeight = texture->height();
    desc.fConfig = texture->config();
    desc.fSampleCnt = 0;

    context->contextPriv().prepareSurfaceForExternalIO(as_IB(textureImage)->peekProxy());
    auto textureData = texture->texturePriv().detachBackendTexture();
    SkASSERT(textureData);

    SkImageInfo info = as_IB(textureImage)->onImageInfo();
    return std::unique_ptr<SkCrossContextImageData>(new SkCrossContextImageData(
        desc, std::move(textureData), info.alphaType(), info.refColorSpace()));
}

    virtual void onDraw(SkCanvas* canvas) {
        SkDevice* device = canvas->getDevice();
        GrRenderTarget* target = (GrRenderTarget*) 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;
                desc.fAALevel   = kNone_GrAALevel;
                // use RT flag bit because in GL it makes the texture be bottom-up
                desc.fFlags     = i ? kRenderTarget_GrTextureFlagBit :
                                      kNone_GrTextureFlags;
                desc.fConfig    = kSkia8888_PM_GrPixelConfig;
                desc.fWidth     = 2 * S;
                desc.fHeight    = 2 * S;
                GrTexture* texture = 
                    ctx->createUncachedTexture(desc, gTextureData, 0);

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

                ctx->setClip(GrRect::MakeWH(2*S, 2*S));
                ctx->setRenderTarget(target);

                GrPaint paint;
                paint.reset();
                paint.fColor = 0xffffffff;
                paint.fSrcBlendCoeff = kOne_BlendCoeff;
                paint.fDstBlendCoeff = kISA_BlendCoeff;
                GrMatrix vm;
                if (i) {
                    vm.setRotate(90 * SK_Scalar1,
                                 S * SK_Scalar1,
                                 S * SK_Scalar1);
                } else {
                    vm.reset();
                }
                ctx->setMatrix(vm);
                GrMatrix tm;
                tm = vm;
                tm.postIDiv(2*S, 2*S);
                paint.textureSampler(0)->setMatrix(tm);
                paint.setTexture(0, texture);

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