Direct2D桌面程序模板

#include "stdafx.h" #include "included.h" // ImageRender类构造函数 ImageRenderer::ImageRenderer() :m_hrInit(E_FAIL), m_hwnd(NULL), m_pD2DFactory(NULL), m_pWICFactory(NULL), m_pDWriteFactory(NULL), m_pRenderTarget(NULL), m_pTextFormatMain(NULL) { // 创建资源 m_hrInit = CreateDeviceIndependentResources(); } // 创建设备无关资源 HRESULT ImageRenderer::CreateDeviceIndependentResources(){ HRESULT hr = S_OK; // 创建 Direct2D 工厂. hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &m_pD2DFactory); if (SUCCEEDED(hr)) { // 创建 WIC 工厂. hr = CoCreateInstance( CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_IWICImagingFactory, reinterpret_cast<void **>(&m_pWICFactory) ); } if (SUCCEEDED(hr)) { // 创建 DirectWrite 工厂. hr = DWriteCreateFactory( DWRITE_FACTORY_TYPE_SHARED, __uuidof(m_pDWriteFactory), reinterpret_cast<IUnknown **>(&m_pDWriteFactory) ); } if (SUCCEEDED(hr)) { // 创建正文文本格式. hr = m_pDWriteFactory->CreateTextFormat( L"Microsoft YaHei", NULL, DWRITE_FONT_WEIGHT_NORMAL, DWRITE_FONT_STYLE_NORMAL, DWRITE_FONT_STRETCH_NORMAL, 30.f, L"", //locale &m_pTextFormatMain ); } return hr; } // 从文件读取位图 HRESULT ImageRenderer::LoadBitmapFromFile( ID2D1RenderTarget *pRenderTarget, IWICImagingFactory *pIWICFactory, PCWSTR uri, UINT destinationWidth, UINT destinationHeight, ID2D1Bitmap **ppBitmap ) { IWICBitmapDecoder *pDecoder = NULL; IWICBitmapFrameDecode *pSource = NULL; IWICStream *pStream = NULL; IWICFormatConverter *pConverter = NULL; IWICBitmapScaler *pScaler = NULL; HRESULT hr = pIWICFactory->CreateDecoderFromFilename( uri, NULL, GENERIC_READ, WICDecodeMetadataCacheOnLoad, &pDecoder ); if (SUCCEEDED(hr)) { hr = pDecoder->GetFrame(0, &pSource); } if (SUCCEEDED(hr)) { hr = pIWICFactory->CreateFormatConverter(&pConverter); } if (SUCCEEDED(hr)) { if (destinationWidth != 0 || destinationHeight != 0) { UINT originalWidth, originalHeight; hr = pSource->GetSize(&originalWidth, &originalHeight); if (SUCCEEDED(hr)) { if (destinationWidth == 0) { FLOAT scalar = static_cast<FLOAT>(destinationHeight) / static_cast<FLOAT>(originalHeight); destinationWidth = static_cast<UINT>(scalar * static_cast<FLOAT>(originalWidth)); } else if (destinationHeight == 0) { FLOAT scalar = static_cast<FLOAT>(destinationWidth) / static_cast<FLOAT>(originalWidth); destinationHeight = static_cast<UINT>(scalar * static_cast<FLOAT>(originalHeight)); } hr = pIWICFactory->CreateBitmapScaler(&pScaler); if (SUCCEEDED(hr)) { hr = pScaler->Initialize( pSource, destinationWidth, destinationHeight, WICBitmapInterpolationModeCubic ); } if (SUCCEEDED(hr)) { hr = pConverter->Initialize( pScaler, GUID_WICPixelFormat32bppPBGRA, WICBitmapDitherTypeNone, NULL, 0.f, WICBitmapPaletteTypeMedianCut ); } } } else { hr = pConverter->Initialize( pSource, GUID_WICPixelFormat32bppPBGRA, WICBitmapDitherTypeNone, NULL, 0.f, WICBitmapPaletteTypeMedianCut ); } } if (SUCCEEDED(hr)) { hr = pRenderTarget->CreateBitmapFromWicBitmap( pConverter, NULL, ppBitmap ); } SafeRelease(pDecoder); SafeRelease(pSource); SafeRelease(pStream); SafeRelease(pConverter); SafeRelease(pScaler); return hr; } // 创建设备相关资源 HRESULT ImageRenderer::CreateDeviceResources() { HRESULT hr = S_OK; if (!m_pRenderTarget) { RECT rc; GetClientRect(m_hwnd, &rc); D2D1_SIZE_U size = D2D1::SizeU( rc.right - rc.left, rc.bottom - rc.top ); // 创建 Direct2D RenderTarget. hr = m_pD2DFactory->CreateHwndRenderTarget( D2D1::RenderTargetProperties(), D2D1::HwndRenderTargetProperties(m_hwnd, size), &m_pRenderTarget ); } return hr; } // ImageRender析构函数 ImageRenderer::~ImageRenderer(){ DiscardDeviceResources(); SafeRelease(m_pD2DFactory); SafeRelease(m_pWICFactory); SafeRelease(m_pDWriteFactory); SafeRelease(m_pTextFormatMain); } // 丢弃设备相关资源 void ImageRenderer::DiscardDeviceResources(){ SafeRelease(m_pRenderTarget); // 清空位图缓存 for (BitmapCacheMap::iterator itr = m_mapBitmapCache.begin(); itr != m_mapBitmapCache.end(); ++itr){ SafeRelease(itr->second); } m_mapBitmapCache.clear(); } // 获取图片 // bitmapName [in] : 文件名 // 返回: NULL表示失败 其余的则为位图的指针 ID2D1Bitmap* ImageRenderer::GetBitmap(std::wstring& bitmapName){ ID2D1Bitmap* pBitmap; // 缓存中没有的话，从文件中读取 BitmapCacheMap::iterator itr = m_mapBitmapCache.find(bitmapName); if (itr == m_mapBitmapCache.end()){ // 读取成功的话 if (SUCCEEDED(LoadBitmapFromFile(m_pRenderTarget, m_pWICFactory, bitmapName.c_str(), 0, 0, &pBitmap))) return m_mapBitmapCache[bitmapName] = pBitmap; else return m_mapBitmapCache[bitmapName] = NULL; } else return itr->second; } // 渲染图形图像 HRESULT ImageRenderer::OnRender(){ HRESULT hr = S_OK; hr = CreateDeviceResources(); if (SUCCEEDED(hr)){ // 开始 m_pRenderTarget->BeginDraw(); // 重置转换 m_pRenderTarget->SetTransform(D2D1::Matrix3x2F::Identity()); // 清屏 m_pRenderTarget->Clear(D2D1::ColorF(0x0066CCFF)); // 正式刻画......... // 结束刻画 hr = m_pRenderTarget->EndDraw(); // 收到重建消息时，释放资源，等待下次自动创建 if (hr == D2DERR_RECREATE_TARGET) { DiscardDeviceResources(); hr = S_OK; } } return hr; }