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