在D2D环境下与GDI结合加载位图
#include <stdio.h> #include <stdlib.h> #include <string.h> #include <Windows.h> #include <d2d1.h> #include <wincodec.h> #pragma comment(lib, "d2d1.lib") #pragma comment(lib, "Windowscodecs.lib") #define SAFE_RELEASE(P) if(P){P->Release() ; P = NULL ;} extern "C" ID2D1Bitmap* mybitmapcreate(ID2D1DCRenderTarget*); float left = 5; float top = 10; float Bottom = 10; float Right = 30; ID2D1Bitmap *pBitmap = NULL; IWICImagingFactory *pIWICFactory = NULL; void initize(); void draw(); D2D1_RECT_F myrect = D2D1::RectF(left, top, Bottom, Right); ID2D1DCRenderTarget* pow; ID2D1Bitmap* mybitmap; ID2D1Factory *l; REFIID x = __uuidof(ID2D1Factory); HRESULT LoadBitmapFromFile( ID2D1RenderTarget *pRenderTarget, IWICImagingFactory *pIWICFactory, PCWSTR uri, UINT destinationWidth, UINT destinationHeight ) { HRESULT hr = S_OK; IWICBitmapDecoder *pDecoder = NULL; IWICBitmapFrameDecode *pSource = NULL; IWICStream *pStream = NULL; IWICFormatConverter *pConverter = NULL; IWICBitmapScaler *pScaler = NULL; hr = pIWICFactory->CreateDecoderFromFilename( uri, NULL, GENERIC_READ, WICDecodeMetadataCacheOnLoad, &pDecoder ); if (SUCCEEDED(hr)) { // Create the initial frame. hr = pDecoder->GetFrame(0, &pSource); } if (SUCCEEDED(hr)) { hr = pIWICFactory->CreateFormatConverter(&pConverter); } // If a new width or height was specified, create an // IWICBitmapScaler and use it to resize the image. 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 ); } } } if (SUCCEEDED(hr)) { // Create a Direct2D bitmap from the WIC bitmap. hr = pRenderTarget->CreateBitmapFromWicBitmap( pConverter, NULL, &pBitmap ); } SAFE_RELEASE(pDecoder); SAFE_RELEASE(pSource); SAFE_RELEASE(pStream); SAFE_RELEASE(pConverter); SAFE_RELEASE(pScaler); return TRUE; } LRESULT CALLBACK WndProcFunc(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam) { RECT rc; switch (message) { case WM_PAINT: { PAINTSTRUCT ps; HDC hdc = BeginPaint(hwnd, &ps); GetClientRect(hwnd, &rc); pow->BindDC(ps.hdc, &rc); draw(); EndPaint(hwnd, &ps); } break; case WM_DESTROY: PostQuitMessage(0); return 0; } return DefWindowProc(hwnd, message, wParam, lParam); } int main(int argc, char* argv[]) { WNDCLASS wc{}; wc.style = CS_HREDRAW | CS_VREDRAW; wc.lpfnWndProc = WndProcFunc; wc.hInstance = GetModuleHandle(NULL); wc.lpszClassName = L"Class_Name"; wc.hCursor = LoadCursor(nullptr, IDC_ARROW); RegisterClass(&wc); HWND hWnd = CreateWindow(L"Class_Name", L"Test", WS_OVERLAPPEDWINDOW, 100, 100, 1000, 500, NULL, NULL, GetModuleHandle(NULL), NULL); initize(); ShowWindow(hWnd, 1); UpdateWindow(hWnd); MSG Msg; while (GetMessage(&Msg, NULL, 0, 0)) { TranslateMessage(&Msg); DispatchMessage(&Msg); } return 0; } void initize() { CoInitializeEx(NULL, COINIT_MULTITHREADED); CoCreateInstance(CLSID_WICImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_IWICImagingFactory, reinterpret_cast<void **>(&pIWICFactory)); // Create a Direct2D render target. D2D1_RENDER_TARGET_PROPERTIES props = D2D1::RenderTargetProperties( D2D1_RENDER_TARGET_TYPE_DEFAULT, D2D1::PixelFormat( DXGI_FORMAT_B8G8R8A8_UNORM, D2D1_ALPHA_MODE_IGNORE), 0, 0, D2D1_RENDER_TARGET_USAGE_NONE, D2D1_FEATURE_LEVEL_DEFAULT ); HRESULT hr = D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &l); l->CreateDCRenderTarget(&props, &pow); } void draw() { LoadBitmapFromFile(pow, pIWICFactory, L"Path\\timg.bmp", 650, 400); pow->BeginDraw(); pow->Clear(D2D1::ColorF(D2D1::ColorF::White)); D2D1_SIZE_F size = pBitmap->GetSize(); D2D1_POINT_2F upperLeftCorner = D2D1::Point2F(0.f, 0.f); // Draw bitmap pow->DrawBitmap( pBitmap, D2D1::RectF( upperLeftCorner.x, upperLeftCorner.y, upperLeftCorner.x + size.width, upperLeftCorner.y + size.height) ); pow->EndDraw(); }
文档参考: https://docs.microsoft.com/en-us/windows/win32/direct2d/direct2d-and-gdi-interoperation-overview
https://docs.microsoft.com/en-us/windows/win32/direct2d/direct2d-quickstart
https://docs.microsoft.com/en-us/windows/win32/direct2d/how-to-load-a-direct2d-bitmap-from-a-file