如何用bmp画窗体中的不规则区域

大脚板 2004-07-15 04:59:17

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kvls 2004-07-15

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刚好机子上有代码，虽然是汇编，不过应该没问题。
;设置窗口大小
invoke GetObject, g_hbmBackground, sizeof BITMAP, addr bm
invoke GetWindowRect, hWnd, addr rcWindow
invoke MoveWindow, hWnd, rcWindow.left, rcWindow.top, bm.bmWidth, bm.bmHeight, TRUE

;设置不规则性
invoke GetDC, hWnd
mov hdc, eax
invoke CreateCompatibleDC, hdc
mov hmemdc, eax
invoke SelectObject, hmemdc, g_hbmBackground
invoke GetPixel, hmemdc, 0, 0
mov colMask, eax
mov x, 0
mov y, 0
invoke CreateRectRgn, 0, 0, bm.bmWidth, bm.bmHeight
mov rgnWnd, eax

.while TRUE
.while TRUE
invoke GetPixel, hmemdc, x, y
.if colMask == eax
mov ebx, x
inc ebx
mov edx, y
inc edx
invoke CreateRectRgn, x, y, ebx, edx
mov rgnTmp, eax
invoke CombineRgn, rgnWnd, rgnWnd, rgnTmp, RGN_XOR
invoke DeleteObject, rgnTmp
.endif
inc x
mov eax, x
.if eax >= bm.bmWidth
mov x, 0
.break
.endif
.endw
inc y
mov eax, y
.break .if eax >= bm.bmHeight
.endw
invoke SetWindowRgn, hWnd, rgnWnd, TRUE

lixiaosan 2004-07-15

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SetWindowRgnSee Also
GetLastError, GetWindowRgn

Requirements
Runs on Versions Defined in Include Link to
Windows CE OS 2.12 and later Winuser.h Winmgr.lib
This function sets the window region of a window. The window region determines the area within the window where the system permits drawing. The system does not display any portion of a window that lies outside of the window region

int SetWindowRgn(
HWND hWnd,
HRGN hRgn,
BOOL bRedraw
);