XCEngine/new_editor/app/Rendering/Native/NativeRendererTextures.cpp

#include "NativeRendererInternal.h"

#include <filesystem>
#include <memory>

namespace XCEngine::UI::Editor::Host {

using namespace NativeRendererInternal;

bool NativeRenderer::LoadTextureFromFile(
    const std::filesystem::path& path,
    ::XCEngine::UI::UITextureHandle& outTexture,
    std::string& outError) {
    outError.clear();
    ReleaseTexture(outTexture);

    auto texture = std::make_unique<NativeTextureResource>();
    if (!DecodeTextureFile(path, *texture, outError)) {
        outTexture = {};
        return false;
    }

    outTexture.nativeHandle = reinterpret_cast<std::uintptr_t>(texture.get());
    outTexture.width = texture->width;
    outTexture.height = texture->height;
    outTexture.kind = ::XCEngine::UI::UITextureHandleKind::DescriptorHandle;
    m_liveTextures.insert(texture.get());
    texture.release();
    return true;
}

bool NativeRenderer::LoadTextureFromMemory(
    const std::uint8_t* data,
    std::size_t size,
    ::XCEngine::UI::UITextureHandle& outTexture,
    std::string& outError) {
    outError.clear();
    ReleaseTexture(outTexture);

    auto texture = std::make_unique<NativeTextureResource>();
    if (!DecodeTextureMemory(data, size, *texture, outError)) {
        outTexture = {};
        return false;
    }

    outTexture.nativeHandle = reinterpret_cast<std::uintptr_t>(texture.get());
    outTexture.width = texture->width;
    outTexture.height = texture->height;
    outTexture.kind = ::XCEngine::UI::UITextureHandleKind::DescriptorHandle;
    m_liveTextures.insert(texture.get());
    texture.release();
    return true;
}

void NativeRenderer::ReleaseTexture(::XCEngine::UI::UITextureHandle& texture) {
    if (!texture.IsValid()) {
        texture = {};
        return;
    }

    auto* resource = reinterpret_cast<NativeTextureResource*>(texture.nativeHandle);
    if (resource != nullptr) {
        const auto found = m_liveTextures.find(resource);
        if (found != m_liveTextures.end()) {
            m_liveTextures.erase(found);
            delete resource;
        }
    }

    texture = {};
}

bool NativeRenderer::ResolveTextureBitmap(
    ID2D1RenderTarget& renderTarget,
    NativeTextureResource& texture,
    Microsoft::WRL::ComPtr<ID2D1Bitmap>& outBitmap) {
    outBitmap.Reset();
    if (texture.width == 0u || texture.height == 0u || texture.pixels.empty()) {
        return false;
    }

    if (texture.cachedBitmap && texture.cachedTarget == &renderTarget) {
        outBitmap = texture.cachedBitmap;
        return true;
    }

    Microsoft::WRL::ComPtr<ID2D1Bitmap> bitmap;
    const D2D1_BITMAP_PROPERTIES properties = D2D1::BitmapProperties(
        D2D1::PixelFormat(DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_PREMULTIPLIED),
        kBaseDpi,
        kBaseDpi);
    const HRESULT hr = renderTarget.CreateBitmap(
        D2D1::SizeU(texture.width, texture.height),
        texture.pixels.data(),
        texture.width * 4u,
        &properties,
        bitmap.ReleaseAndGetAddressOf());
    if (FAILED(hr) || !bitmap) {
        return false;
    }

    if (&renderTarget == m_renderTarget.Get()) {
        texture.cachedBitmap = bitmap;
        texture.cachedTarget = &renderTarget;
    }

    outBitmap = std::move(bitmap);
    return true;
}

bool NativeRenderer::ResolveInteropBitmap(
    const ::XCEngine::UI::UITextureHandle& texture,
    Microsoft::WRL::ComPtr<ID2D1Bitmap>& outBitmap) const {
    return m_windowInterop.ResolveInteropBitmap(texture, outBitmap);
}

} // namespace XCEngine::UI::Editor::Host