agg/examples/win32_api/pure_api/pure_api.cpp

293 lines
8.9 KiB
C++

// 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<agg::pixfmt_bgra32> renb(pixf);
renb.clear(agg::rgba8(255, 255, 255, 255));
// Scanline renderer for solid filling.
agg::renderer_scanline_aa_solid<agg::renderer_base<agg::pixfmt_bgra32> > 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;
}