reactos/rostests/dibtests/alphablend/alphablend.c

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#include <windows.h>
#include <string.h>
BOOL WINAPI GdiAlphaBlend(HDC hdcDst, int xDst, int yDst, int widthDst, int heightDst,
HDC hdcSrc, int xSrc, int ySrc, int widthSrc, int heightSrc,
BLENDFUNCTION blendFunction);
#ifndef AC_SRC_ALPHA
#define AC_SRC_ALPHA (0x1)
#endif
HINSTANCE HInst;
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)
{
WNDCLASS wc;
MSG msg;
HInst = HInstance;
memset(&wc, 0, sizeof(WNDCLASS));
wc.style = CS_VREDRAW | CS_HREDRAW | CS_DBLCLKS;
wc.lpfnWndProc = MainWndProc;
wc.hInstance = HInstance;
wc.hCursor = LoadCursor(NULL, (LPCTSTR)IDC_ARROW);
/* wc.hbrBackground = reinterpret_cast<HBRUSH>(COLOR_BTNFACE + 1); */
wc.hbrBackground = (HBRUSH)(COLOR_BTNFACE + 1);
wc.lpszClassName = WndClassName;
if (RegisterClass(&wc))
{
HWND HWnd =
CreateWindow(
WndClassName, TEXT("AlphaBlend Rendering Demo"),
WS_OVERLAPPED | WS_SYSMENU | WS_CAPTION |
WS_VISIBLE | WS_CLIPSIBLINGS,
0, 0, 320, 430,
NULL, NULL, HInst, NULL
);
if (HWnd)
{
ShowWindow(HWnd, nCmdShow);
UpdateWindow(HWnd);
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
}
return 0;
}
/* image related */
BITMAP bmp;
LPCSTR filename = TEXT("lena.bmp");
HDC HMemDC = NULL, HMemDC2 = NULL;
HBITMAP HOldBmp = NULL;
PVOID pBmpBits = NULL;
HBITMAP H32BppBitmap = NULL;
BITMAPINFO bmpi;
BOOL ConvertBitmapTo32Bpp(HDC hDC, BITMAP *bmp)
{
ZeroMemory(&bmpi, sizeof(BITMAPINFO));
bmpi.bmiHeader.biSize = sizeof(BITMAPINFO);
bmpi.bmiHeader.biWidth = bmp->bmWidth;
bmpi.bmiHeader.biHeight = bmp->bmHeight;
bmpi.bmiHeader.biPlanes = 1;
bmpi.bmiHeader.biBitCount = 32;
bmpi.bmiHeader.biCompression = BI_RGB;
bmpi.bmiHeader.biSizeImage = 4 * bmpi.bmiHeader.biWidth * bmpi.bmiHeader.biHeight;
H32BppBitmap = CreateDIBSection(hDC, &bmpi, DIB_RGB_COLORS, &pBmpBits, 0, 0);
if(H32BppBitmap)
{
HBITMAP bmpalpha;
SelectObject(hDC, H32BppBitmap);
BitBlt(hDC, 0, 0, bmp->bmWidth, bmp->bmHeight, HMemDC, 0, 0, SRCCOPY);
/* load and apply alpha channel */
bmpalpha = LoadImage(HInst, MAKEINTRESOURCE(2000), IMAGE_BITMAP,
0, 0, 0);
if(bmpalpha)
{
COLORREF *col = pBmpBits;
int x, y;
HDC hdcTemp = CreateCompatibleDC(NULL);
if(!hdcTemp)
{
DeleteObject(bmpalpha);
return FALSE;
}
SelectObject(hdcTemp, bmpalpha);
for(y = 0; y < bmp->bmHeight; y++)
{
for(x = 0; x < bmp->bmWidth; x++)
{
COLORREF Color = (COLORREF)GetRValue(GetPixel(hdcTemp, x, y)) << 24;
*col++ |= Color;
}
}
DeleteObject(bmpalpha);
DeleteDC(hdcTemp);
return TRUE;
}
return FALSE;
}
return FALSE;
}
LRESULT CALLBACK MainWndProc(HWND HWnd, UINT Msg, WPARAM WParam,
LPARAM LParam)
{
switch (Msg)
{
case WM_CREATE:
{
/* create a memory DC */
HMemDC = CreateCompatibleDC(NULL);
if (HMemDC)
{
/* load a bitmap from file */
HBITMAP HBmp =
/* static_cast<HBITMAP> */(
LoadImage(HInst, MAKEINTRESOURCE(1000), IMAGE_BITMAP,
0, 0, 0)
);
if (HBmp)
{
/* extract dimensions of the bitmap */
GetObject(HBmp, sizeof(BITMAP), &bmp);
/* associate the bitmap with the memory DC */
/* HOldBmp = static_cast<HBITMAP> */
(SelectObject(HMemDC, HBmp)
);
HMemDC2 = CreateCompatibleDC(NULL);
if(!ConvertBitmapTo32Bpp(HMemDC2, &bmp))
{
PostQuitMessage(0);
return 0;
}
}
}
}
case WM_PAINT:
{
PAINTSTRUCT ps;
BLENDFUNCTION BlendFunc;
HDC Hdc = BeginPaint(HWnd, &ps);
#if 0
try
#endif
{
BlendFunc.BlendOp = AC_SRC_OVER;
BlendFunc.BlendFlags = 0;
BlendFunc.SourceConstantAlpha = 128;
BlendFunc.AlphaFormat = 0;
BitBlt(Hdc, 100, 90,
bmp.bmWidth, bmp.bmHeight,
HMemDC2, 0, 0,
SRCCOPY);
GdiAlphaBlend(Hdc, 0, 0, bmp.bmWidth, bmp.bmHeight,
HMemDC2, 0, 0, bmp.bmWidth, bmp.bmHeight,
BlendFunc);
GdiAlphaBlend(Hdc, bmp.bmWidth - 15, 10, bmp.bmWidth / 2, bmp.bmHeight / 2,
HMemDC2, 0, 0, bmp.bmWidth, bmp.bmHeight,
BlendFunc);
BlendFunc.SourceConstantAlpha = 255;
BlendFunc.AlphaFormat = AC_SRC_ALPHA;
GdiAlphaBlend(Hdc, 140, 200, bmp.bmWidth, bmp.bmHeight,
HMemDC2, 0, 0, bmp.bmWidth, bmp.bmHeight,
BlendFunc);
GdiAlphaBlend(Hdc, 20, 210, (bmp.bmWidth / 3) * 2, (bmp.bmHeight / 3) * 2,
HMemDC2, 0, 0, bmp.bmWidth, bmp.bmHeight,
BlendFunc);
}
#if 0
catch (...)
{
EndPaint(HWnd, &ps);
}
#endif
EndPaint(HWnd, &ps);
break;
}
case WM_DESTROY:
{
/* clean up */
DeleteObject(SelectObject(HMemDC, HOldBmp));
DeleteDC(HMemDC);
DeleteDC(HMemDC2);
PostQuitMessage(0);
return 0;
}
}
return DefWindowProc(HWnd, Msg, WParam, LParam);
}