vbltest.c

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/*
 * Tests various blit and blend operations with different src
 * bit depths and scaling where possbile.
 *
 * Created by Gregor Schneider <grschneider AT gmail DOT com>, November 2008
*/
 
#include <windows.h>
#include <tchar.h>
 
BOOL WINAPI GdiAlphaBlend(
                HDC hdcDst, int xDst, int yDst, int wDst, int hDst,
                HDC hdcSrc, int xSrc, int ySrc, int wSrc, int hSrc,
                BLENDFUNCTION blendFunction);
 
BOOL WINAPI GdiTransparentBlt(
                HDC hdcDst, int xDst, int yDst, int wDst, int hDst,
                HDC hdcSrc, int xSrc, int ySrc, int wSrc, int hSrc,
                UINT crTransparent);
 
#define CURRENT_BMPS 4
#define CURRENT_ICONS 1
#define SCALE 1.5
#define OFFSET 5
 
HINSTANCE hInst;
TCHAR szWindowClass[] = _T("testclass");
 
static LRESULT CALLBACK
WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    static HBITMAP hbmList[CURRENT_BMPS];
    static HICON hicList[CURRENT_ICONS];
 
    switch (message)
    {
        case WM_CREATE:
        {
            hbmList[0] = (HBITMAP)LoadImage(hInst, MAKEINTRESOURCE(100), IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR);
            hbmList[1] = (HBITMAP)LoadImage(hInst, MAKEINTRESOURCE(400), IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR);
            hbmList[2] = (HBITMAP)LoadImage(hInst, MAKEINTRESOURCE(800), IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR);
            hbmList[3] = (HBITMAP)LoadImage(hInst, MAKEINTRESOURCE(2400), IMAGE_BITMAP, 0, 0, LR_DEFAULTCOLOR);
            hicList[0] = (HICON)LoadIcon(hInst, MAKEINTRESOURCE(3200));
            break;
        }
 
        case WM_PAINT:
        {
            PAINTSTRUCT ps;
            HDC hdc, hdcMem;
            BITMAP bitmap;
            BLENDFUNCTION bfunc;
            int x = 0, y = 0, i;
            hdc = BeginPaint(hWnd, &ps);
            hdcMem = CreateCompatibleDC(hdc);
 
            bfunc.AlphaFormat = AC_SRC_ALPHA;
            bfunc.BlendFlags = 0;
            bfunc.BlendOp = AC_SRC_OVER;
            bfunc.SourceConstantAlpha = 128;
 
            /* bitmaps */
            for(i = 0; i < CURRENT_BMPS; i++)
            {
                y = 0;
                SelectObject(hdcMem, hbmList[i]);
                GetObject(hbmList[i], sizeof(BITMAP), &bitmap);
 
                /* bit blt */
                BitBlt(hdc, x, y, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);
                y += bitmap.bmHeight + OFFSET;
 
                /* stretch blt, org size */
                StretchBlt(hdc, x, y, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, SRCCOPY);
                y += bitmap.bmHeight + OFFSET;
 
                /* stretch blt, scaled */
                StretchBlt(hdc, x, y, bitmap.bmWidth*SCALE, bitmap.bmHeight*SCALE, hdcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, SRCCOPY);
                y += bitmap.bmHeight*SCALE + OFFSET;
 
                /* transparent blt, transparency: grey */
                GdiTransparentBlt(hdc, x, y, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, 128*256*256+128*256+128);
                y += bitmap.bmHeight + OFFSET;
 
                /* transparent blt, transparency: grey, scaled */
                GdiTransparentBlt(hdc, x, y, bitmap.bmWidth*SCALE, bitmap.bmHeight*SCALE, hdcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, 128*256*256+128*256+128);
                y += bitmap.bmHeight*SCALE + OFFSET;
 
                /* alpha blend, org size */
                GdiAlphaBlend(hdc, x, y, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, bfunc);
                y += bitmap.bmHeight + OFFSET;
 
                /* alpha blend, scaled */
                GdiAlphaBlend(hdc, x, y, bitmap.bmWidth*SCALE, bitmap.bmHeight*SCALE, hdcMem, 0, 0, bitmap.bmWidth, bitmap.bmHeight, bfunc);
                y += bitmap.bmHeight*SCALE + OFFSET;
 
                x += bitmap.bmWidth*SCALE + OFFSET;
            }
 
            /* icons */
            for(i = 0; i < CURRENT_ICONS; i++)
            {
                y = 0;
                /* pure icon */
                DrawIcon(hdc, x, y, hicList[i]);
                y += bitmap.bmHeight + OFFSET;
 
                /* normal icon using Ex */
                DrawIconEx(hdc, x, y, hicList[i], 0, 0, 0, NULL, DI_NORMAL);
                y += bitmap.bmHeight + OFFSET;
 
                /* normal icon using Ex with bigger size */
                DrawIconEx(hdc, x, y, hicList[i], bitmap.bmWidth, bitmap.bmHeight, 0, NULL, DI_NORMAL);
                y += bitmap.bmHeight + OFFSET;
 
                /* only icon using Ex */
                DrawIconEx(hdc, x, y, hicList[i], 0, 0, 0, NULL, DI_IMAGE);
                y += bitmap.bmHeight + OFFSET;
 
                /* mask using Ex */
                DrawIconEx(hdc, x, y, hicList[i], 0, 0, 0, NULL, DI_MASK);
                y += bitmap.bmHeight + OFFSET;
 
                x += bitmap.bmWidth*SCALE + OFFSET;
            }
 
            DeleteDC(hdcMem);
            EndPaint(hWnd, &ps);
            break;
        }
 
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}
 
 
static ATOM
MyRegisterClass(HINSTANCE hInstance)
{
    WNDCLASSEX wcex;
 
    wcex.cbSize = sizeof(WNDCLASSEX);
 
    wcex.style         = CS_HREDRAW | CS_VREDRAW;
    wcex.lpfnWndProc   = WndProc;
    wcex.cbClsExtra    = 0;
    wcex.cbWndExtra    = 0;
    wcex.hInstance     = hInstance;
    wcex.hIcon         = NULL;
    wcex.hCursor       = LoadCursor(NULL, IDC_ARROW);
    wcex.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
    wcex.lpszMenuName  = NULL;
    wcex.lpszClassName = szWindowClass;
    wcex.hIconSm       = NULL;
 
    return RegisterClassEx(&wcex);
}
 
 
static BOOL
InitInstance(HINSTANCE hInstance, int nCmdShow)
{
   HWND hWnd;
 
   hInst = hInstance;
 
   hWnd = CreateWindowEx(0,
                         szWindowClass,
                         _T("Various blit and blend operations"),
                         WS_OVERLAPPEDWINDOW,
                         CW_USEDEFAULT,
                         CW_USEDEFAULT,
                         640,
                         640,
                         NULL,
                         NULL,
                         hInstance,
                         NULL);
 
   if (!hWnd)
   {
      return FALSE;
   }
 
   ShowWindow(hWnd, nCmdShow);
   UpdateWindow(hWnd);
 
   return TRUE;
}
 
 
int WINAPI
_tWinMain(HINSTANCE hInstance,
                     HINSTANCE hPrevInstance,
                     LPTSTR    lpCmdLine,
                     int       nCmdShow)
{
    MSG msg;
 
    MyRegisterClass(hInstance);
 
    if (!InitInstance(hInstance, nCmdShow))
    {
        return FALSE;
    }
 
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }
 
    return (int)msg.wParam;
}