C++ GrBackendTexture::hasMipMaps方法代码示例

sk_sp<GrTexture> GrMockGpu::onWrapBackendTexture(const GrBackendTexture& tex,
                                                 GrWrapOwnership ownership,
                                                 GrWrapCacheable wrapType, GrIOType ioType) {
    GrSurfaceDesc desc;
    desc.fWidth = tex.width();
    desc.fHeight = tex.height();

    GrMockTextureInfo info;
    SkAssertResult(tex.getMockTextureInfo(&info));
    desc.fConfig = info.fConfig;

    GrMipMapsStatus mipMapsStatus = tex.hasMipMaps() ? GrMipMapsStatus::kValid
                                                     : GrMipMapsStatus::kNotAllocated;

    return sk_sp<GrTexture>(new GrMockTexture(this, desc, mipMapsStatus, info, wrapType, ioType));
}

sk_sp<GrTexture> GrGpu::wrapBackendTexture(const GrBackendTexture& backendTex,
                                           GrWrapOwnership ownership) {
    this->handleDirtyContext();
    if (!this->caps()->isConfigTexturable(backendTex.config())) {
        return nullptr;
    }
    if (backendTex.width() > this->caps()->maxTextureSize() ||
        backendTex.height() > this->caps()->maxTextureSize()) {
        return nullptr;
    }
    sk_sp<GrTexture> tex = this->onWrapBackendTexture(backendTex, ownership);
    if (tex && !backendTex.hasMipMaps()) {
        // Ganesh will not ever allocate mipmaps for a wrapped resource. By setting this flag here,
        // it will be propagated to any proxy that wraps this texture.
        tex->texturePriv().setDoesNotSupportMipMaps();
    }
    return tex;
}

DEF_GPUTEST_FOR_RENDERING_CONTEXTS(ReimportImageTextureWithMipLevels, reporter, ctxInfo) {
    auto* ctx = ctxInfo.grContext();
    if (!ctx->priv().caps()->mipMapSupport()) {
        return;
    }
    static constexpr auto kCreateWithMipMaps = true;
    auto surf = SkSurface::MakeRenderTarget(
            ctx, SkBudgeted::kYes,
            SkImageInfo::Make(100, 100, kRGBA_8888_SkColorType, kPremul_SkAlphaType), 1,
            kTopLeft_GrSurfaceOrigin, nullptr, kCreateWithMipMaps);
    if (!surf) {
        return;
    }
    surf->getCanvas()->drawColor(SK_ColorDKGRAY);
    auto img = surf->makeImageSnapshot();
    if (!img) {
        return;
    }
    surf.reset();
    GrBackendTexture btex;
    SkImage::BackendTextureReleaseProc texRelease;
    if (!SkImage::MakeBackendTextureFromSkImage(ctx, std::move(img), &btex, &texRelease)) {
        // Not all backends support stealing textures yet.
        // ERRORF(reporter, "Could not turn image into texture");
        return;
    }
    REPORTER_ASSERT(reporter, btex.hasMipMaps());
    // Reimport the texture as an image and perform a downsampling draw with medium quality which
    // should use the upper MIP levels.
    img = SkImage::MakeFromTexture(ctx, btex, kTopLeft_GrSurfaceOrigin, kRGBA_8888_SkColorType,
                                   kPremul_SkAlphaType, nullptr);
    const auto singlePixelInfo =
            SkImageInfo::Make(1, 1, kRGBA_8888_SkColorType, kPremul_SkAlphaType, nullptr);
    surf = SkSurface::MakeRenderTarget(ctx, SkBudgeted::kYes, singlePixelInfo, 1,
                                       kTopLeft_GrSurfaceOrigin, nullptr);
    SkPaint paint;
    paint.setFilterQuality(kMedium_SkFilterQuality);
    surf->getCanvas()->drawImageRect(img, SkRect::MakeWH(1, 1), &paint);
    uint32_t pixel;
    surf->readPixels(singlePixelInfo, &pixel, sizeof(uint32_t), 0, 0);
    REPORTER_ASSERT(reporter, pixel == SkPreMultiplyColor(SK_ColorDKGRAY));
    img.reset();
    texRelease(btex);
}

sk_sp<GrTexture> GrMockGpu::onWrapRenderableBackendTexture(const GrBackendTexture& tex,
                                                           int sampleCnt,
                                                           GrWrapOwnership ownership) {
    GrSurfaceDesc desc;
    desc.fFlags = kRenderTarget_GrSurfaceFlag;
    desc.fWidth = tex.width();
    desc.fHeight = tex.height();

    GrMockTextureInfo texInfo;
    SkAssertResult(tex.getMockTextureInfo(&texInfo));
    desc.fConfig = texInfo.fConfig;

    GrMipMapsStatus mipMapsStatus =
            tex.hasMipMaps() ? GrMipMapsStatus::kValid : GrMipMapsStatus::kNotAllocated;

    GrMockRenderTargetInfo rtInfo;
    rtInfo.fConfig = texInfo.fConfig;
    // The client gave us the texture ID but we supply the render target ID.
    rtInfo.fID = NextInternalRenderTargetID();

    return sk_sp<GrTexture>(
            new GrMockTextureRenderTarget(this, desc, mipMapsStatus, texInfo, rtInfo));
}

sk_sp<GrTexture> GrGpu::wrapRenderableBackendTexture(const GrBackendTexture& backendTex,
                                                     int sampleCnt, GrWrapOwnership ownership) {
    this->handleDirtyContext();
    if (sampleCnt < 1) {
        return nullptr;
    }
    if (!this->caps()->isConfigTexturable(backendTex.config()) ||
        !this->caps()->getRenderTargetSampleCount(sampleCnt, backendTex.config())) {
        return nullptr;
    }

    if (backendTex.width() > this->caps()->maxRenderTargetSize() ||
        backendTex.height() > this->caps()->maxRenderTargetSize()) {
        return nullptr;
    }
    sk_sp<GrTexture> tex = this->onWrapRenderableBackendTexture(backendTex, sampleCnt, ownership);
    if (tex && !backendTex.hasMipMaps()) {
        // Ganesh will not ever allocate mipmaps for a wrapped resource. By setting this flag here,
        // it will be propagated to any proxy that wraps this texture.
        tex->texturePriv().setDoesNotSupportMipMaps();
    }
    SkASSERT(!tex || tex->asRenderTarget());
    return tex;
}