Magic_Game/src/kiwano/render/DirectX/TextDrawingEffect.cpp

// Copyright (c) 2023 Kiwano - Nomango
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in
// all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
// THE SOFTWARE.

#include <kiwano/render/DirectX/TextDrawingEffect.h>

namespace kiwano
{
class TextDrawingEffect : public ITextDrawingEffect
{
public:
    TextDrawingEffect();

    STDMETHOD(CreateDeviceResources)(_In_ ID2D1Factory* pFactory);

    STDMETHOD(CreateOutlineGeomerty)
    (_Out_ ID2D1Geometry** ppOutlineGeo, _In_ DWRITE_GLYPH_RUN const* glyphRun, float fOriginX, float fOriginY);

    // IUnknown methods
    virtual HRESULT STDMETHODCALLTYPE QueryInterface(REFIID iid, void** ppvObject);
    virtual ULONG STDMETHODCALLTYPE   AddRef();
    virtual ULONG STDMETHODCALLTYPE   Release();

private:
    unsigned long             cRefCount_;
    ComPtr<ID2D1Factory>      pFactory_;

    // Outline geometry cache
    const DWRITE_GLYPH_RUN* pLastGlyphRun_;
    float                   fLastOriginX_;
    float                   fLastOriginY_;
    ComPtr<ID2D1Geometry>   pOutlineGeo_;
};

HRESULT ITextDrawingEffect::Create(_Out_ ITextDrawingEffect** ppTextDrawingEffect, _In_ ID2D1Factory* pFactory)
{
    HRESULT hr = E_FAIL;

    if (ppTextDrawingEffect)
    {
        TextDrawingEffect* pTextDrawingEffect = new (std::nothrow) TextDrawingEffect;
        if (pTextDrawingEffect)
        {
            hr = pTextDrawingEffect->CreateDeviceResources(pFactory);

            if (SUCCEEDED(hr))
            {
                pTextDrawingEffect->AddRef();

                DX::SafeRelease(*ppTextDrawingEffect);
                (*ppTextDrawingEffect) = pTextDrawingEffect;
                return S_OK;
            }
            else
            {
                delete pTextDrawingEffect;
                pTextDrawingEffect = NULL;
            }
        }
    }
    return hr;
}

TextDrawingEffect::TextDrawingEffect()
    : cRefCount_(0)
    , pLastGlyphRun_(nullptr)
    , fLastOriginX_(0)
    , fLastOriginY_(0)
{
}

STDMETHODIMP TextDrawingEffect::CreateDeviceResources(_In_ ID2D1Factory* pFactory)
{
    pFactory_ = pFactory;
    return S_OK;
}

STDMETHODIMP TextDrawingEffect::CreateOutlineGeomerty(_Out_ ID2D1Geometry**        ppOutlineGeo,
                                                      _In_ DWRITE_GLYPH_RUN const* glyphRun, float fOriginX,
                                                      float fOriginY)
{
    HRESULT hr = S_OK;

    if (pOutlineGeo_ && glyphRun == pLastGlyphRun_ && fOriginX == fLastOriginX_ && fOriginY == fLastOriginY_)
    {
        // Use cached geometry
        pOutlineGeo_->AddRef();
        DX::SafeRelease(*ppOutlineGeo);
        (*ppOutlineGeo) = pOutlineGeo_.Get();
        return S_OK;
    }

    ComPtr<ID2D1GeometrySink>        pSink;
    ComPtr<ID2D1PathGeometry>        pPathGeometry;
    ComPtr<ID2D1TransformedGeometry> pTransformedGeometry;

    if (SUCCEEDED(hr))
    {
        hr = pFactory_->CreatePathGeometry(&pPathGeometry);
    }

    if (SUCCEEDED(hr))
    {
        hr = pPathGeometry->Open(&pSink);

        if (SUCCEEDED(hr))
        {
            hr = glyphRun->fontFace->GetGlyphRunOutline(
                glyphRun->fontEmSize, glyphRun->glyphIndices, glyphRun->glyphAdvances, glyphRun->glyphOffsets,
                glyphRun->glyphCount, glyphRun->isSideways, glyphRun->bidiLevel % 2, pSink.Get());
        }

        if (SUCCEEDED(hr))
        {
            hr = pSink->Close();
        }

        if (SUCCEEDED(hr))
        {
            D2D1::Matrix3x2F const matrix = D2D1::Matrix3x2F(1.0f, 0.0f, 0.0f, 1.0f, fOriginX, fOriginY);

            if (SUCCEEDED(hr))
            {
                hr = pFactory_->CreateTransformedGeometry(pPathGeometry.Get(), &matrix, &pTransformedGeometry);
            }
        }
    }

    if (SUCCEEDED(hr))
    {
        pOutlineGeo_   = pTransformedGeometry;
        pLastGlyphRun_ = glyphRun;
        fLastOriginX_  = fOriginX;
        fLastOriginY_  = fOriginY;

        pOutlineGeo_->AddRef();
        DX::SafeRelease(*ppOutlineGeo);
        (*ppOutlineGeo) = pOutlineGeo_.Get();
    }
    return hr;
}

STDMETHODIMP_(unsigned long) TextDrawingEffect::AddRef()
{
    return InterlockedIncrement(&cRefCount_);
}

STDMETHODIMP_(unsigned long) TextDrawingEffect::Release()
{
    unsigned long newCount = InterlockedDecrement(&cRefCount_);

    if (newCount == 0)
    {
        delete this;
        return 0;
    }

    return newCount;
}

STDMETHODIMP TextDrawingEffect::QueryInterface(REFIID riid, void** ppvObject)
{
    if (__uuidof(ITextDrawingEffect) == riid)
    {
        *ppvObject = this;
    }
    else if (__uuidof(IUnknown) == riid)
    {
        *ppvObject = this;
    }
    else
    {
        *ppvObject = NULL;
        return E_FAIL;
    }

    AddRef();

    return S_OK;
}
}  // namespace kiwano