/*
 * Copyright 2016 Google Inc.
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "GrTextureRenderTargetProxy.h"

// Deferred version
// This class is virtually derived from GrSurfaceProxy (via both GrTextureProxy and
// GrRenderTargetProxy) so its constructor must be explicitly called.
GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(const GrCaps& caps,
                                                       const GrSurfaceDesc& desc,
                                                       SkBackingFit fit,
                                                       SkBudgeted budgeted,
                                                       uint32_t flags)
    : GrSurfaceProxy(desc, fit, budgeted, flags)
    // for now textures w/ data are always wrapped
    , GrTextureProxy(desc, fit, budgeted, nullptr, 0, flags) 
    , GrRenderTargetProxy(caps, desc, fit, budgeted, flags) {
}

// Wrapped version
// This class is virtually derived from GrSurfaceProxy (via both GrTextureProxy and
// GrRenderTargetProxy) so its constructor must be explicitly called.
GrTextureRenderTargetProxy::GrTextureRenderTargetProxy(sk_sp<GrSurface> surf)
    : GrSurfaceProxy(surf, SkBackingFit::kExact)
    , GrTextureProxy(sk_ref_sp(surf->asTexture()))
    , GrRenderTargetProxy(sk_ref_sp(surf->asRenderTarget())) {
    SkASSERT(surf->asTexture());
    SkASSERT(surf->asRenderTarget());
}

size_t GrTextureRenderTargetProxy::onUninstantiatedGpuMemorySize() const {
    int colorSamplesPerPixel = this->numColorSamples() + 1;

    static const bool kHasMipMaps = true;
    // TODO: add tracking of mipmap state to improve the estimate. We track whether we are created
    // with mip maps but not whether a texture read from the proxy will lazily generate mip maps.

    // TODO: do we have enough information to improve this worst case estimate?
    return GrSurface::ComputeSize(fConfig, fWidth, fHeight, colorSamplesPerPixel, kHasMipMaps,
                                  SkBackingFit::kApprox == fFit);
}

GrSurface* GrTextureRenderTargetProxy::instantiate(GrResourceProvider* resourceProvider) {
    static constexpr GrSurfaceFlags kFlags = kRenderTarget_GrSurfaceFlag;

    GrSurface* surf = this->instantiateImpl(resourceProvider, this->numStencilSamples(), kFlags,
                                            this->isMipMapped(), this->mipColorMode());
    if (!surf) {
        return nullptr;
    }
    SkASSERT(surf->asRenderTarget());
    SkASSERT(surf->asTexture());

    return surf;
}