/*
 * Copyright 2017 Google LLC
 *
 * Use of this source code is governed by a BSD-style license that can be
 * found in the LICENSE file.
 */

#include "include/gpu/ganesh/GrBackendSurface.h"

#include "include/gpu/MutableTextureState.h"  // IWYU pragma: keep
#include "include/gpu/ganesh/GrTypes.h"
#include "include/private/SkAssert.h"
#include "include/private/gpu/ganesh/GrTypesPriv.h"
#include "src/gpu/GpuTypesPriv.h"
#include "src/gpu/ganesh/GrBackendSurfacePriv.h"
#include "src/gpu/ganesh/GrUtil.h"

#include <algorithm>
#include <new>

GrBackendFormat::GrBackendFormat() : fValid(false) {}
GrBackendFormat::~GrBackendFormat() = default;

GrBackendFormat::GrBackendFormat(const GrBackendFormat& that)
        : fBackend(that.fBackend), fTextureType(that.fTextureType), fValid(that.fValid) {
    if (!fValid) {
        return;
    }

    fFormatData.reset();
    that.fFormatData->copyTo(fFormatData);
}

GrBackendFormat& GrBackendFormat::operator=(const GrBackendFormat& that) {
    if (this != &that) {
        this->~GrBackendFormat();
        new (this) GrBackendFormat(that);
    }
    return *this;
}

uint32_t GrBackendFormat::channelMask() const {
    if (!this->isValid()) {
        return 0;
    }
    return fFormatData->channelMask();
}

GrColorFormatDesc GrBackendFormat::desc() const {
    if (!this->isValid()) {
        return GrColorFormatDesc::MakeInvalid();
    }
    return fFormatData->desc();
}

GrBackendFormat GrBackendFormat::makeTexture2D() const {
    GrBackendFormat copy = *this;
    copy.fFormatData->makeTexture2D();  // no-op for non-Vulkan
    copy.fTextureType = GrTextureType::k2D;
    return copy;
}

bool GrBackendFormat::operator==(const GrBackendFormat& that) const {
    // Invalid GrBackendFormats are never equal to anything.
    if (!fValid || !that.fValid) {
        return false;
    }

    if (fBackend != that.fBackend) {
        return false;
    }

    return fFormatData->equal(that.fFormatData.get());
}

#if defined(SK_DEBUG) || defined(GPU_TEST_UTILS)
#include "include/core/SkString.h"

SkString GrBackendFormat::toStr() const {
    if (!this->isValid()) {
        return SkString("invalid");
    }
    SkString str;
    str.appendf("%s-", GrBackendApiToStr(fBackend));
    str.append(fFormatData->toString());
    return str;
}
#endif

///////////////////////////////////////////////////////////////////////////////////////////////////
GrBackendTexture::GrBackendTexture() : fIsValid(false) {}

GrBackendTexture::~GrBackendTexture() = default;

GrBackendTexture::GrBackendTexture(const GrBackendTexture& that) : fIsValid(false) {
    *this = that;
}

GrBackendTexture& GrBackendTexture::operator=(const GrBackendTexture& that) {
    if (this == &that) {
        return *this;
    }

    fTextureData.reset();
    if (!that.isValid()) {
        fIsValid = false;
        return *this;
    }
    fWidth = that.fWidth;
    fHeight = that.fHeight;
    fMipmapped = that.fMipmapped;
    fBackend = that.fBackend;
    fTextureType = that.fTextureType;
    that.fTextureData->copyTo(fTextureData);
    fIsValid = true;
    return *this;
}

sk_sp<skgpu::MutableTextureState> GrBackendTexture::getMutableState() const {
    return fTextureData->getMutableState();
}

void GrBackendTexture::setMutableState(const skgpu::MutableTextureState& state) {
    fTextureData->setMutableState(state);
}

bool GrBackendTexture::isProtected() const {
    if (!this->isValid()) {
        return false;
    }
    return fTextureData->isProtected();
}

bool GrBackendTexture::isSameTexture(const GrBackendTexture& that) {
    if (!this->isValid() || !that.isValid()) {
        return false;
    }
    if (fBackend != that.fBackend) {
        return false;
    }
    return fTextureData->isSameTexture(that.fTextureData.get());
}

GrBackendFormat GrBackendTexture::getBackendFormat() const {
    if (!this->isValid()) {
        return GrBackendFormat();
    }
    return fTextureData->getBackendFormat();
}

#if defined(GPU_TEST_UTILS)
bool GrBackendTexture::TestingOnly_Equals(const GrBackendTexture& t0, const GrBackendTexture& t1) {
    if (!t0.isValid() || !t1.isValid()) {
        return false; // two invalid backend textures are not considered equal
    }

    if (t0.fWidth != t1.fWidth ||
        t0.fHeight != t1.fHeight ||
        t0.fMipmapped != t1.fMipmapped ||
        t0.fBackend != t1.fBackend) {
        return false;
    }

    return t0.fTextureData->equal(t1.fTextureData.get());
}
#endif

////////////////////////////////////////////////////////////////////////////////////////////////////

GrBackendRenderTarget::GrBackendRenderTarget() : fIsValid(false) {}

GrBackendRenderTarget::~GrBackendRenderTarget() = default;

GrBackendRenderTarget::GrBackendRenderTarget(const GrBackendRenderTarget& that) : fIsValid(false) {
    *this = that;
}

GrBackendRenderTarget& GrBackendRenderTarget::operator=(const GrBackendRenderTarget& that) {
    if (this == &that) {
        return *this;
    }

    fRTData.reset();
    if (!that.isValid()) {
        fIsValid = false;
        return *this;
    }
    fWidth = that.fWidth;
    fHeight = that.fHeight;
    fSampleCnt = that.fSampleCnt;
    fStencilBits = that.fStencilBits;
    fBackend = that.fBackend;
    that.fRTData->copyTo(fRTData);
    fIsValid = true;
    return *this;
}

sk_sp<skgpu::MutableTextureState> GrBackendRenderTarget::getMutableState() const {
    return fRTData->getMutableState();
}

GrBackendFormat GrBackendRenderTarget::getBackendFormat() const {
    if (!this->isValid()) {
        return GrBackendFormat();
    }
    return fRTData->getBackendFormat();
}

void GrBackendRenderTarget::setMutableState(const skgpu::MutableTextureState& state) {
    fRTData->setMutableState(state);
}

bool GrBackendRenderTarget::isProtected() const {
    if (!this->isValid()) {
        return false;
    }
    return fRTData->isProtected();
}

#if defined(GPU_TEST_UTILS)
bool GrBackendRenderTarget::TestingOnly_Equals(const GrBackendRenderTarget& r0,
                                               const GrBackendRenderTarget& r1) {
    if (!r0.isValid() || !r1.isValid()) {
        return false; // two invalid backend rendertargets are not considered equal
    }

    if (r0.fWidth != r1.fWidth ||
        r0.fHeight != r1.fHeight ||
        r0.fSampleCnt != r1.fSampleCnt ||
        r0.fStencilBits != r1.fStencilBits ||
        r0.fBackend != r1.fBackend) {
        return false;
    }

    return r0.fRTData->equal(r1.fRTData.get());
}
#endif

GrBackendFormatData::~GrBackendFormatData() {}
GrBackendTextureData::~GrBackendTextureData() {}
GrBackendRenderTargetData::~GrBackendRenderTargetData() {}