// pure_api.cpp : Defines the entry point for the application. // #include "stdafx.h" #include "resource.h" #include "agg_scanline_p.h" #include "agg_renderer_scanline.h" #include "agg_pixfmt_rgba.h" #include "agg_rasterizer_scanline_aa.h" #define MAX_LOADSTRING 100 // Global Variables: HINSTANCE hInst; // current instance TCHAR szTitle[MAX_LOADSTRING]; // The title bar text TCHAR szWindowClass[MAX_LOADSTRING]; // The title bar text // Foward declarations of functions included in this code module: ATOM MyRegisterClass(HINSTANCE hInstance); BOOL InitInstance(HINSTANCE, int); LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM); LRESULT CALLBACK About(HWND, UINT, WPARAM, LPARAM); int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { // TODO: Place code here. MSG msg; HACCEL hAccelTable; // Initialize global strings LoadString(hInstance, IDS_APP_TITLE, szTitle, MAX_LOADSTRING); LoadString(hInstance, IDC_PURE_API, szWindowClass, MAX_LOADSTRING); MyRegisterClass(hInstance); // Perform application initialization: if (!InitInstance (hInstance, nCmdShow)) { return FALSE; } hAccelTable = LoadAccelerators(hInstance, (LPCTSTR)IDC_PURE_API); // Main message loop: while (GetMessage(&msg, NULL, 0, 0)) { if (!TranslateAccelerator(msg.hwnd, hAccelTable, &msg)) { TranslateMessage(&msg); DispatchMessage(&msg); } } return msg.wParam; } // // FUNCTION: MyRegisterClass() // // PURPOSE: Registers the window class. // // COMMENTS: // // This function and its usage is only necessary if you want this code // to be compatible with Win32 systems prior to the 'RegisterClassEx' // function that was added to Windows 95. It is important to call this function // so that the application will get 'well formed' small icons associated // with it. // ATOM MyRegisterClass(HINSTANCE hInstance) { WNDCLASSEX wcex; wcex.cbSize = sizeof(WNDCLASSEX); wcex.style = CS_HREDRAW | CS_VREDRAW; wcex.lpfnWndProc = (WNDPROC)WndProc; wcex.cbClsExtra = 0; wcex.cbWndExtra = 0; wcex.hInstance = hInstance; wcex.hIcon = LoadIcon(hInstance, (LPCTSTR)IDI_PURE_API); wcex.hCursor = LoadCursor(NULL, IDC_ARROW); wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1); wcex.lpszMenuName = (LPCSTR)IDC_PURE_API; wcex.lpszClassName = szWindowClass; wcex.hIconSm = LoadIcon(wcex.hInstance, (LPCTSTR)IDI_SMALL); return RegisterClassEx(&wcex); } // // FUNCTION: InitInstance(HANDLE, int) // // PURPOSE: Saves instance handle and creates main window // // COMMENTS: // // In this function, we save the instance handle in a global variable and // create and display the main program window. // BOOL InitInstance(HINSTANCE hInstance, int nCmdShow) { HWND hWnd; hInst = hInstance; // Store instance handle in our global variable hWnd = CreateWindow(szWindowClass, szTitle, WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, 0, CW_USEDEFAULT, 0, NULL, NULL, hInstance, NULL); if (!hWnd) { return FALSE; } ShowWindow(hWnd, nCmdShow); UpdateWindow(hWnd); return TRUE; } // // FUNCTION: WndProc(HWND, unsigned, WORD, LONG) // // PURPOSE: Processes messages for the main window. // // WM_COMMAND - process the application menu // WM_PAINT - Paint the main window // WM_DESTROY - post a quit message and return // // LRESULT CALLBACK WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) { int wmId, wmEvent; PAINTSTRUCT ps; HDC hdc; TCHAR szHello[MAX_LOADSTRING]; LoadString(hInst, IDS_HELLO, szHello, MAX_LOADSTRING); switch (message) { case WM_COMMAND: wmId = LOWORD(wParam); wmEvent = HIWORD(wParam); // Parse the menu selections: switch (wmId) { case IDM_ABOUT: DialogBox(hInst, (LPCTSTR)IDD_ABOUTBOX, hWnd, (DLGPROC)About); break; case IDM_EXIT: DestroyWindow(hWnd); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } break; case WM_PAINT: { hdc = BeginPaint(hWnd, &ps); RECT rt; GetClientRect(hWnd, &rt); int width = rt.right - rt.left; int height = rt.bottom - rt.top; //============================================================ //Creating compatible DC and a bitmap to render the image BITMAPINFO bmp_info; bmp_info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER); bmp_info.bmiHeader.biWidth = width; bmp_info.bmiHeader.biHeight = height; bmp_info.bmiHeader.biPlanes = 1; bmp_info.bmiHeader.biBitCount = 32; bmp_info.bmiHeader.biCompression = BI_RGB; bmp_info.bmiHeader.biSizeImage = 0; bmp_info.bmiHeader.biXPelsPerMeter = 0; bmp_info.bmiHeader.biYPelsPerMeter = 0; bmp_info.bmiHeader.biClrUsed = 0; bmp_info.bmiHeader.biClrImportant = 0; HDC mem_dc = ::CreateCompatibleDC(hdc); void* buf = 0; HBITMAP bmp = ::CreateDIBSection( mem_dc, &bmp_info, DIB_RGB_COLORS, &buf, 0, 0 ); // Selecting the object before doing anything allows you // to use AGG together with native Windows GDI. HBITMAP temp = (HBITMAP)::SelectObject(mem_dc, bmp); //============================================================ // AGG lowest level code. agg::rendering_buffer rbuf; rbuf.attach((unsigned char*)buf, width, height, -width*4); // Use negative stride in order // to keep Y-axis consistent with // WinGDI, i.e., going down. // Pixel format and basic primitives renderer agg::pixfmt_bgra32 pixf(rbuf); agg::renderer_base renb(pixf); renb.clear(agg::rgba8(255, 255, 255, 255)); // Scanline renderer for solid filling. agg::renderer_scanline_aa_solid > ren(renb); // Rasterizer & scanline agg::rasterizer_scanline_aa<> ras; agg::scanline_p8 sl; // Polygon (triangle) ras.move_to_d(20.7, 34.15); ras.line_to_d(398.23, 123.43); ras.line_to_d(165.45, 401.87); // Setting the attrribute (color) & Rendering ren.color(agg::rgba8(80, 90, 60)); agg::render_scanlines(ras, sl, ren); //============================================================ //------------------------------------------------------------ // Display the image. If the image is B-G-R-A (32-bits per pixel) // one can use AlphaBlend instead of BitBlt. In case of AlphaBlend // one also should clear the image with zero alpha, i.e. rgba8(0,0,0,0) ::BitBlt( hdc, rt.left, rt.top, width, height, mem_dc, 0, 0, SRCCOPY ); // Free resources ::SelectObject(mem_dc, temp); ::DeleteObject(bmp); ::DeleteObject(mem_dc); EndPaint(hWnd, &ps); } break; case WM_ERASEBKGND: // Don't forget to do nothing on Erase Background event :-) break; case WM_DESTROY: PostQuitMessage(0); break; default: return DefWindowProc(hWnd, message, wParam, lParam); } return 0; } // Mesage handler for about box. LRESULT CALLBACK About(HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam) { switch (message) { case WM_INITDIALOG: return TRUE; case WM_COMMAND: if (LOWORD(wParam) == IDOK || LOWORD(wParam) == IDCANCEL) { EndDialog(hDlg, LOWORD(wParam)); return TRUE; } break; } return FALSE; }