reactos/apps/tests/alphablend
diff -N alphablend.c
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ alphablend.c 17 Feb 2004 14:55:59 -0000 1.1
@@ -0,0 +1,213 @@
+#include <windows.h>
+#include <string.h>
+
+#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);
+
+WINBOOL
+STDCALL
+GdiAlphaBlend(HDC hdcDst,LONG DstX,LONG DstY,LONG DstCx,LONG DstCy,HDC hdcSrc,LONG SrcX,LONG SrcY,LONG SrcCx,LONG SrcCy,BLENDFUNCTION BlendFunction);
+
+
+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, TEXT("lenaalpha.bmp"), IMAGE_BITMAP,
+ 0, 0, LR_LOADFROMFILE);
+ 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, filename, IMAGE_BITMAP,
+ 0, 0, LR_LOADFROMFILE)
+ );
+ 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);
+}
