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SimpleText.cpp



/************************************************************************
 *
 * File: SimpleText.cpp
 *
 * Description: 
 * 
 * 
 *  This file is part of the Microsoft Windows SDK Code Samples.
 * 
 *  Copyright (C) Microsoft Corporation.  All rights reserved.
 * 
 * This source code is intended only as a supplement to Microsoft
 * Development Tools and/or on-line documentation.  See these other
 * materials for detailed information regarding Microsoft code samples.
 * 
 * THIS CODE AND INFORMATION ARE PROVIDED AS IS WITHOUT WARRANTY OF ANY
 * KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND/OR FITNESS FOR A
 * PARTICULAR PURPOSE.
 * 
 ************************************************************************/

#include "DWriteHelloWorld.h"


/******************************************************************
*                                                                 *
*  SimpleText::SimpleText constructor                             *
*                                                                 *
*  Initialize member data                                         *
*                                                                 *
******************************************************************/

SimpleText::SimpleText() :
    hwnd_(NULL),
    wszText_(NULL),
    cTextLength_(0),
    pD2DFactory_(NULL),
    pRT_(NULL),
    pBlackBrush_(NULL),
    pDWriteFactory_(NULL),
    pTextFormat_(NULL)
{
}

/******************************************************************
*                                                                 *
*  SimpleText::~SimpleText destructor                             *
*                                                                 *
*  Tear down resources                                            *
*                                                                 *
******************************************************************/

SimpleText::~SimpleText()
{
    SafeRelease(&pD2DFactory_);
    SafeRelease(&pRT_);
    SafeRelease(&pBlackBrush_);
    SafeRelease(&pDWriteFactory_);
    SafeRelease(&pTextFormat_);
}

/******************************************************************
*                                                                 *
*  SimpleText::Initialize                                         *
*                                                                 *
*  Create application window and device-independent resources     *
*                                                                 *
******************************************************************/

HRESULT SimpleText::Initialize(HWND hwndParent)
{
    WNDCLASSEX wcex;

    //get the dpi information
    HDC screen = GetDC(0);
    dpiScaleX_ = GetDeviceCaps(screen, LOGPIXELSX) / 96.0f;
    dpiScaleY_ = GetDeviceCaps(screen, LOGPIXELSY) / 96.0f;
    ReleaseDC(0, screen);
    
    HRESULT hr = S_OK;

    ATOM atom;

    // Register window class.
    wcex.cbSize        = sizeof(WNDCLASSEX);
    wcex.style         = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc   = SimpleText::WndProc;
    wcex.cbClsExtra    = 0;
    wcex.cbWndExtra    = sizeof(LONG_PTR);
    wcex.hInstance     = HINST_THISCOMPONENT;
    wcex.hbrBackground = NULL;
    wcex.lpszMenuName  = NULL;
    wcex.hIcon         = LoadIcon(
                            NULL,
                            IDI_APPLICATION);
    wcex.hCursor       = LoadCursor(
                            NULL,
                            IDC_ARROW);
    wcex.lpszClassName = TEXT("D2DSimpleText");
    wcex.hIconSm       = LoadIcon(
                            NULL,
                            IDI_APPLICATION
                            );

    atom = RegisterClassEx(
        &wcex
        );

    hr = atom ? S_OK : E_FAIL;

    // Create window.
    hwnd_ = CreateWindow(
        TEXT("D2DSimpleText"),
        TEXT(""),
        WS_CHILD,
        0,
        0,
        static_cast<int>(640.0f / dpiScaleX_),
        static_cast<int>(480.0f / dpiScaleY_),
        hwndParent,
        NULL,
        HINST_THISCOMPONENT,
        this
        );
   
    if (SUCCEEDED(hr))
    {
        hr = hwnd_ ? S_OK : E_FAIL;
    }
    
    if (SUCCEEDED(hr))
    {
        hr = CreateDeviceIndependentResources(
            );
    }


    if (SUCCEEDED(hr))
    {
        ShowWindow(
            hwnd_,
            SW_SHOWNORMAL
            );


        UpdateWindow(
            hwnd_
            );
    }

    if (SUCCEEDED(hr))
    {
        DrawD2DContent();
    }

    return hr;
}

/******************************************************************
*                                                                 *
*  SimpleText::CreateDeviceIndependentResources                   *
*                                                                 *
*  This method is used to create resources which are not bound    *
*  to any device. Their lifetime effectively extends for the      *
*  duration of the app. These resources include the Direct2D and  *
*  DirectWrite factories; and a DirectWrite Text Format object    *
*  (used for identifying particular font characteristics) and     *
*  a Direct2D geometry.                                           *
*                                                                 *
******************************************************************/

HRESULT SimpleText::CreateDeviceIndependentResources()
{
    HRESULT hr;

    // Create Direct2D factory.

    hr = D2D1CreateFactory(
        D2D1_FACTORY_TYPE_SINGLE_THREADED,
        &pD2DFactory_
        );


    // Create a shared DirectWrite factory.

    if (SUCCEEDED(hr))
    {
        hr = DWriteCreateFactory(
            DWRITE_FACTORY_TYPE_SHARED,
            __uuidof(IDWriteFactory),
            reinterpret_cast<IUnknown**>(&pDWriteFactory_)
            );
    }


    // The string to display.

    wszText_ = L"Hello World using  DirectWrite!";
    cTextLength_ = (UINT32) wcslen(wszText_);


    // Create a text format using Gabriola with a font size of 72.
    // This sets the default font, weight, stretch, style, and locale.

    if (SUCCEEDED(hr))
    {
        hr = pDWriteFactory_->CreateTextFormat(
            L"Gabriola",                // Font family name.
            NULL,                       // Font collection (NULL sets it to use the system font collection).
            DWRITE_FONT_WEIGHT_REGULAR,
            DWRITE_FONT_STYLE_NORMAL,
            DWRITE_FONT_STRETCH_NORMAL,
            72.0f,
            L"en-us",
            &pTextFormat_
            );
    }



    // Center align (horizontally) the text.
    if (SUCCEEDED(hr))
    {
        hr = pTextFormat_->SetTextAlignment(DWRITE_TEXT_ALIGNMENT_CENTER);
    }

    if (SUCCEEDED(hr))
    {
        hr = pTextFormat_->SetParagraphAlignment(DWRITE_PARAGRAPH_ALIGNMENT_CENTER);
    }


    return hr;
}

/******************************************************************
*                                                                 *
*  SimpleText::CreateDeviceResources                              *
*                                                                 *
*  This method creates resources which are bound to a particular  *
*  D3D device. It's all centralized here, in case the resources   *
*  need to be recreated in case of D3D device loss (eg. display   *
*  change, remoting, removal of video card, etc).                 *
*                                                                 *
******************************************************************/

HRESULT SimpleText::CreateDeviceResources()
{
    HRESULT hr = S_OK;


    RECT rc;
    GetClientRect(hwnd_, &rc);

    D2D1_SIZE_U size = D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top);

    if (!pRT_)
    {
        // Create a Direct2D render target.
        hr = pD2DFactory_->CreateHwndRenderTarget(
                D2D1::RenderTargetProperties(),
                D2D1::HwndRenderTargetProperties(
                    hwnd_,
                    size
                    ),
                &pRT_
                );

        // Create a black brush.
        if (SUCCEEDED(hr))
        {
            hr = pRT_->CreateSolidColorBrush(
                D2D1::ColorF(D2D1::ColorF::Black),
                &pBlackBrush_
                );
        }
    }


    return hr;
}

/******************************************************************
*                                                                 *
*  SimpleText::DiscardDeviceResources                             *
*                                                                 *
*  Discard device-specific resources which need to be recreated   *
*  when a D3D device is lost                                      *
*                                                                 *
******************************************************************/

void SimpleText::DiscardDeviceResources()
{

    SafeRelease(&pRT_);
    SafeRelease(&pBlackBrush_);

}


/******************************************************************
*                                                                 *
*  SimpleText::DrawText                                           *
*                                                                 *
*  This method will draw text using the IDWriteTextFormat         *
*  via the Direct2D render target                                 *
*                                                                 *
******************************************************************/

HRESULT SimpleText::DrawText()
{
    RECT rc;

    GetClientRect(
        hwnd_,
        &rc
        );

    // Create a D2D rect that is the same size as the window.

    D2D1_RECT_F layoutRect = D2D1::RectF(
        static_cast<FLOAT>(rc.left) / dpiScaleX_,
        static_cast<FLOAT>(rc.top) / dpiScaleY_,
        static_cast<FLOAT>(rc.right - rc.left) / dpiScaleX_,
        static_cast<FLOAT>(rc.bottom - rc.top) / dpiScaleY_
        );


    // Use the DrawText method of the D2D render target interface to draw.

    pRT_->DrawText(
        wszText_,        // The string to render.
        cTextLength_,    // The string's length.
        pTextFormat_,    // The text format.
        layoutRect,       // The region of the window where the text will be rendered.
        pBlackBrush_     // The brush used to draw the text.
        );


    return S_OK;
}

/******************************************************************
*                                                                 *
*  SimpleText::DrawD2DContent                                     *
*                                                                 *
*  This method writes "Hello World"                               *
*                                                                 *
*  Note that this function will automatically discard device-     *
*  specific resources if the D3D device disappears during         *
*  function invocation, and will recreate the resources the next  *
*  time it's invoked.                                             *
*                                                                 *
******************************************************************/

HRESULT SimpleText::DrawD2DContent()
{
    HRESULT hr;


    hr = CreateDeviceResources();

    if (SUCCEEDED(hr))
    {
        pRT_->BeginDraw();

        pRT_->SetTransform(D2D1::IdentityMatrix());

        pRT_->Clear(D2D1::ColorF(D2D1::ColorF::White));

        // Call the DrawText method of this class.
        hr = DrawText();

        if (SUCCEEDED(hr))
        {
            hr = pRT_->EndDraw(
                );
        }
    }

    if (FAILED(hr))
    {
        DiscardDeviceResources();
    }


    return hr;
}


/******************************************************************
*                                                                 *
*  SimpleText::OnResize                                           *
*                                                                 *
*  If the application receives a WM_SIZE message, this method     *
*  resize the render target appropriately.                        *
*                                                                 *
******************************************************************/

void SimpleText::OnResize(UINT width, UINT height)
{
    if (pRT_)
    {
        D2D1_SIZE_U size;
        size.width = width;
        size.height = height;
        pRT_->Resize(size);
    }
}

/******************************************************************
*                                                                 *
*  SimpleText::WndProc                                            *
*                                                                 *
*  Window message handler                                         *
*                                                                 *
******************************************************************/

LRESULT CALLBACK SimpleText::WndProc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    if (message == WM_CREATE)
    {
        LPCREATESTRUCT pcs = (LPCREATESTRUCT)lParam;
        SimpleText *pSimpleText = (SimpleText *)pcs->lpCreateParams;

        ::SetWindowLongPtrW(
            hwnd,
            GWLP_USERDATA,
            PtrToUlong(pSimpleText));

        return 1;
    }

    SimpleText *pSimpleText = reinterpret_cast<SimpleText *>(
                ::GetWindowLongPtr(hwnd, GWLP_USERDATA));

    if (pSimpleText)
    {
        switch(message)
        {
        case WM_SIZE:
            {
                UINT width = LOWORD(lParam);
                UINT height = HIWORD(lParam);
                pSimpleText->OnResize(width, height);
            }
            return 0;

        case WM_PAINT:
        case WM_DISPLAYCHANGE:
            {
                PAINTSTRUCT ps;
                BeginPaint(hwnd, &ps);
                pSimpleText->DrawD2DContent();
                EndPaint(
                    hwnd,
                    &ps
                    );
            }
            return 0;

        case WM_DESTROY:
            {
                PostQuitMessage(0);
            }
            return 1;
        }
    }
    return DefWindowProc(
        hwnd,
        message,
        wParam,
        lParam
        );
}



 

 

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