mirror of
https://github.com/reactos/reactos.git
synced 2024-08-30 15:18:33 +00:00
180 lines
5.1 KiB
C++
180 lines
5.1 KiB
C++
|
|
// ------------------------------------------------------------------
|
|
// Windows 2000 Graphics API Black Book
|
|
// Chapter 2 - CD-ROM (WM_ERASEBKGND Demo)
|
|
//
|
|
// Created by Damon Chandler <dmc27@ee.cornell.edu>
|
|
// Updates can be downloaded at: <www.coriolis.com>
|
|
//
|
|
// Please do not hesistate to e-mail me at dmc27@ee.cornell.edu
|
|
// if you have any questions about this code.
|
|
// ------------------------------------------------------------------
|
|
|
|
//*********************************************************//
|
|
// //
|
|
// SYNOPSIS: //
|
|
// This sample project demonstrates how to render //
|
|
// a background image in response to the WM_ERASEBKGND //
|
|
// message. It also shows how to create a transparent //
|
|
// static (text) control by handling the //
|
|
// WM_CTLCOLORSTATIC message. //
|
|
// //
|
|
//*********************************************************//
|
|
|
|
|
|
//>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>>
|
|
#include <windows.h>
|
|
//<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<<
|
|
|
|
|
|
HINSTANCE HInst;
|
|
HINSTANCE HPrevInst;
|
|
TCHAR *cmdline;
|
|
const char* WndClassName = "GMainWnd";
|
|
LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
|
|
LPARAM LParam);
|
|
|
|
|
|
int APIENTRY WinMain(HINSTANCE HInstance, HINSTANCE HPrevInstance,
|
|
LPTSTR lpCmdLine, int nCmdShow)
|
|
{
|
|
HInst = HInstance;
|
|
HPrevInst = HPrevInstance;
|
|
cmdline = lpCmdLine;
|
|
|
|
WNDCLASS wc;
|
|
memset(&wc, 0, sizeof(WNDCLASS));
|
|
|
|
wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
|
|
wc.lpfnWndProc = MainWndProc;
|
|
wc.hInstance = HInstance;
|
|
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
|
|
wc.hbrBackground =
|
|
reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1);
|
|
wc.lpszClassName = WndClassName;
|
|
|
|
if (RegisterClass(&wc))
|
|
{
|
|
HWND HWnd =
|
|
CreateWindow(WndClassName,
|
|
TEXT("WM_ERASEBKGND Demo"),
|
|
WS_OVERLAPPEDWINDOW | WS_CAPTION |
|
|
WS_VISIBLE | WS_CLIPSIBLINGS,
|
|
CW_USEDEFAULT, CW_USEDEFAULT, 205, 85,
|
|
NULL, NULL, HInstance, NULL);
|
|
|
|
if (HWnd)
|
|
{
|
|
ShowWindow(HWnd, nCmdShow);
|
|
UpdateWindow(HWnd);
|
|
|
|
MSG msg;
|
|
while (GetMessage(&msg, NULL, 0, 0))
|
|
{
|
|
TranslateMessage(&msg);
|
|
DispatchMessage(&msg);
|
|
}
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
//------------------------------------------------------------------
|
|
|
|
|
|
// static text and bitmap-related variables
|
|
HWND HStatic;
|
|
HDC HMemDC;
|
|
HBITMAP HBmp, HOldBmp;
|
|
const char* filename = "BACKBITMAP.BMP";
|
|
|
|
LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
|
|
LPARAM LParam)
|
|
{
|
|
switch (Msg)
|
|
{
|
|
case WM_CREATE:
|
|
{
|
|
HStatic =
|
|
CreateWindow(TEXT("STATIC"), TEXT("Static Text"),
|
|
WS_CHILD | WS_VISIBLE | SS_CENTER,
|
|
10, 20, 175, 30,
|
|
HWnd, NULL, HInst, NULL);
|
|
|
|
// create a memory DC compatible with the screen
|
|
HMemDC = CreateCompatibleDC(NULL);
|
|
if (HMemDC)
|
|
{
|
|
// load a DDB from file
|
|
HBmp = static_cast<HBITMAP>(
|
|
LoadImage(HInst, filename, IMAGE_BITMAP,
|
|
0, 0, LR_LOADFROMFILE)
|
|
);
|
|
if (HBmp)
|
|
{
|
|
// associate the DDB with the memory DC
|
|
HOldBmp = static_cast<HBITMAP>(
|
|
SelectObject(HMemDC, HBmp)
|
|
);
|
|
}
|
|
}
|
|
}
|
|
case WM_CTLCOLORSTATIC:
|
|
{
|
|
if (reinterpret_cast<HWND>(LParam) == HStatic)
|
|
{
|
|
HDC HStaticDC = reinterpret_cast<HDC>(WParam);
|
|
SetBkMode(HStaticDC, TRANSPARENT);
|
|
|
|
return reinterpret_cast<LRESULT>(
|
|
GetStockObject(NULL_BRUSH)
|
|
);
|
|
}
|
|
break;
|
|
}
|
|
case WM_ERASEBKGND:
|
|
{
|
|
BITMAP bmp;
|
|
if (GetObject(HBmp, sizeof(BITMAP), &bmp))
|
|
{
|
|
RECT RClient;
|
|
GetClientRect(HWnd, &RClient);
|
|
|
|
HDC Hdc = reinterpret_cast<HDC>(WParam);
|
|
SetStretchBltMode(Hdc, COLORONCOLOR);
|
|
|
|
//
|
|
// TODO: add palette handling code for
|
|
// palettized displays (see Chapter 9)...
|
|
//
|
|
|
|
// render the background image
|
|
StretchBlt(Hdc, 0, 0,
|
|
RClient.right - RClient.left,
|
|
RClient.bottom - RClient.top,
|
|
HMemDC, 0, 0, bmp.bmWidth, bmp.bmHeight,
|
|
SRCCOPY);
|
|
return TRUE;
|
|
}
|
|
break;
|
|
}
|
|
case WM_DESTROY:
|
|
{
|
|
if (HBmp)
|
|
{
|
|
// free the bitmap
|
|
DeleteObject(SelectObject(HMemDC, HOldBmp));
|
|
}
|
|
// free the memory DC
|
|
DeleteDC(HMemDC);
|
|
|
|
PostQuitMessage(0);
|
|
return 0;
|
|
}
|
|
}
|
|
return DefWindowProc(HWnd, Msg, WParam, LParam);
|
|
}
|
|
//------------------------------------------------------------------
|
|
|
|
|
|
|