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winapibitmapregion

Bitmap with rounded corners


    GetWindowRect(hWnd, &wnd);
    hdc = BeginPaint(hWnd, &ps);
    hdcMem = CreateCompatibleDC(hdc);

    for (int i = 0; i < n; ++i)
    {
        HRGN rgn = CreateRoundRectRgn(0, 0, CARD_WIDTH, CARD_HEIGHT, 7, 7);
        SetWindowRgn(cards[info[i].card], rgn, TRUE);
        oldBitmap = SelectObject(hdcMem, cards[info[i].card]);
        GetObject(cards[info[i].card], sizeof(bitmap), &bitmap);
        BitBlt(hdc, info[i].pos.x, info[i].pos.y, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);
        SelectObject(hdcMem, oldBitmap);
    }

I have problem with cutting corners for bitmap picture.


Solution

  • GetWindowRect(hWnd, &wnd);
            hdc = BeginPaint(hWnd, &ps);
            hdcMem = CreateCompatibleDC(hdc);
            for (int i = 0; i < n; ++i)
            {
                HRGN rgn = CreateRoundRectRgn(info[i].pos.x, info[i].pos.y, info[i].pos.x + CARD_WIDTH, info[i].pos.y + CARD_HEIGHT, 7, 7);
                SelectClipRgn(hdc, rgn);
                oldBitmap = SelectObject(hdcMem, cards[info[i].card]);
                GetObject(cards[info[i].card], sizeof(bitmap), &bitmap);
                BitBlt(hdc, info[i].pos.x, info[i].pos.y, bitmap.bmWidth, bitmap.bmHeight, hdcMem, 0, 0, SRCCOPY);
                SelectObject(hdcMem, oldBitmap);
            }
    

    Thanks to Jonathan Potter.