Direct2D 第1篇 最简单的D2D程序

#include <windows.h>
#include <d2d1.h>
#include <d2d1helper.h>
#include <dwrite.h>
#pragma comment(lib, "dwrite.lib")
#pragma comment(lib, "d2d1.lib")

static HINSTANCE g_hinst;
static HWND g_hwnd;
static bool g_flag_app_exit;

static ID2D1Factory * g_factory;
static ID2D1HwndRenderTarget * g_render_target;

void OnSize(LPARAM lparam)
{
if(g_render_target)
g_render_target->Resize(D2D1::SizeU(LOWORD(lparam),HIWORD(lparam)));
}

bool AppInit()
{
D2D1CreateFactory(D2D1_FACTORY_TYPE_SINGLE_THREADED, &g_factory);

RECT rc;
GetClientRect(g_hwnd, &rc);

g_factory->CreateHwndRenderTarget(
D2D1::RenderTargetProperties(),
D2D1::HwndRenderTargetProperties(g_hwnd, D2D1::SizeU(rc.right - rc.left, rc.bottom - rc.top)    ),
&g_render_target);

return true;
}

void OnPaint()
{
if(!g_render_target)
return;

g_render_target->BeginDraw();
g_render_target->Clear(D2D1::ColorF(0.63, 0.84, 0.00));
g_render_target->EndDraw();
}

void AppExit()
{
g_render_target->Release();
g_factory->Release();
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wparam, LPARAM lparam)
{
switch(msg)
{
case WM_PAINT:
OnPaint();
break;

case WM_SIZE:
OnSize(lparam);
break;

case WM_DESTROY:
g_flag_app_exit = true;
break;

default:
return DefWindowProc(hwnd, msg, wparam, lparam);
}
return 0;
}

int WINAPI WinMain(HINSTANCE hinst, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
MSG msg;

memset(&wc,0,sizeof(wc));
wc.cbSize = sizeof(WNDCLASSEX);
wc.lpfnWndProc = WndProc;
wc.hInstance = hinst;
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszClassName = "WindowClass";
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);

if(!RegisterClassEx(&wc))
{
MessageBox(NULL, "Window Registration Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
return 0;
}

g_hinst = hinst;

g_hwnd = CreateWindowEx(WS_EX_CLIENTEDGE,"WindowClass","Direct2D Demo",WS_VISIBLE|WS_OVERLAPPEDWINDOW,
CW_USEDEFAULT,
CW_USEDEFAULT,
640,
480,
NULL, NULL, hinst, NULL);

if(g_hwnd == NULL)
{
MessageBox(NULL, "Window Creation Failed!","Error!",MB_ICONEXCLAMATION|MB_OK);
return 0;
}

if(!AppInit())
{
MessageBox(NULL, "Application Initialisation Failed !","Error",MB_ICONEXCLAMATION|MB_OK);
return 0;
}

while(!g_flag_app_exit)
{
if(PeekMessage(&msg, g_hwnd, 0, 0, PM_REMOVE))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}

AppExit();

return msg.wParam;
}