From d003db65315a2d1fc68b58c254e4d231c3981abe Mon Sep 17 00:00:00 2001
From: Birunthan Mohanathas <birunthan@mohanathas.com>
Date: Sun, 29 Sep 2013 11:28:28 +0300
Subject: [PATCH] Gfx: Add __D2DParams option to allow testing D2D text
 rendering options

---
 Common/Gfx/Canvas.h      |  3 +++
 Common/Gfx/CanvasD2D.cpp | 25 +++++++++++++++++++++++++
 Common/Gfx/CanvasD2D.h   |  4 ++++
 3 files changed, 32 insertions(+)

diff --git a/Common/Gfx/Canvas.h b/Common/Gfx/Canvas.h
index 5b7b88dd..c64170ca 100644
--- a/Common/Gfx/Canvas.h
+++ b/Common/Gfx/Canvas.h
@@ -84,6 +84,9 @@ public:
 	virtual void SetAntiAliasing(bool enable) = 0;
 	virtual void SetTextAntiAliasing(bool enable) = 0;
 
+	// FIXME: Temporary hack to test things out. This will be removed when no longer needed.
+	virtual void SetTextRenderingOptions(float gamma, float enhancedContrast) {};
+
 	virtual void Clear(const Gdiplus::Color& color = Gdiplus::Color(0, 0, 0, 0)) = 0;
 
 	virtual void DrawTextW(const WCHAR* str, UINT strLen, const TextFormat& format, Gdiplus::RectF& rect, const Gdiplus::SolidBrush& brush) = 0;
diff --git a/Common/Gfx/CanvasD2D.cpp b/Common/Gfx/CanvasD2D.cpp
index fe1c7d12..b9fde5cb 100644
--- a/Common/Gfx/CanvasD2D.cpp
+++ b/Common/Gfx/CanvasD2D.cpp
@@ -167,6 +167,10 @@ bool CanvasD2D::BeginTargetDraw()
 	if (SUCCEEDED(hr))
 	{
 		SetTextAntiAliasing(m_TextAntiAliasing);
+		if (m_TextRenderingParams)
+		{
+			m_Target->SetTextRenderingParams(m_TextRenderingParams.Get());
+		}
 
 		m_Target->BeginDraw();
 
@@ -295,6 +299,27 @@ void CanvasD2D::SetTextAntiAliasing(bool enable)
 	}
 }
 
+void CanvasD2D::SetTextRenderingOptions(float gamma, float enhancedContrast)
+{
+	Microsoft::WRL::ComPtr<IDWriteRenderingParams> defaultRenderingParams;
+	HRESULT hr = c_DWFactory->CreateRenderingParams(defaultRenderingParams.GetAddressOf());
+	if (SUCCEEDED(hr))
+	{
+		hr = c_DWFactory->CreateCustomRenderingParams(
+			gamma,
+			enhancedContrast,
+			defaultRenderingParams->GetClearTypeLevel(),
+			defaultRenderingParams->GetPixelGeometry(),
+			defaultRenderingParams->GetRenderingMode(),
+			m_TextRenderingParams.ReleaseAndGetAddressOf());
+	}
+
+	if (SUCCEEDED(hr) && m_Target)
+	{
+		m_Target->SetTextRenderingParams(m_TextRenderingParams.Get());
+	}
+}
+
 void CanvasD2D::Clear(const Gdiplus::Color& color)
 {
 	if (!m_Target)  // Use GDI+ if D2D render target has not been created.
diff --git a/Common/Gfx/CanvasD2D.h b/Common/Gfx/CanvasD2D.h
index 94179b8b..2f578713 100644
--- a/Common/Gfx/CanvasD2D.h
+++ b/Common/Gfx/CanvasD2D.h
@@ -60,6 +60,7 @@ public:
 
 	virtual void SetAntiAliasing(bool enable) override;
 	virtual void SetTextAntiAliasing(bool enable) override;
+	virtual void SetTextRenderingOptions(float gamma, float enhancedContrast) override;
 
 	virtual void Clear(const Gdiplus::Color& color) override;
 
@@ -90,6 +91,9 @@ private:
 	void UpdateTargetTransform();
 
 	Microsoft::WRL::ComPtr<ID2D1RenderTarget> m_Target;
+	Microsoft::WRL::ComPtr<IDWriteRenderingParams> m_TextRenderingParams;
+
+	// Underlying pixel data shared by both m_Target and m_GdipBitmap.
 	Util::WICBitmapDIB m_Bitmap;
 
 	// GDI+ objects that share the pixel data of m_Bitmap.