Win32 transparent rectangle12/3/2023 ![]() GDI fills a rectangle up to, but not including, the right column and bottom row, regardless of the current mapping mode. When filling the specified rectangle, FillRect does not include the rectangle's right and bottom sides. For example:įillRect(hdc, &rect, (HBRUSH) (COLOR_WINDOW+1)) įor a list of all the standard system colors, see GetSysColor. ![]() If specifying a color value for the hbr parameter, it must be one of the standard system colors (the value 1 must be added to the chosen color). Additionally, you may retrieve a handle to one of the stock brushes by using the GetStockObject function. If specifying a handle to a logical brush, call one of the following functions to obtain the handle: CreateHatchBrush, CreatePatternBrush, or CreateSolidBrush. The brush identified by the hbr parameter may be either a handle to a logical brush or a color value. If the function fails, the return value is zero. If the function succeeds, the return value is nonzero. However, there are many functions in the WIN32 GDI that require a region. They are device independent, which means that a device context (DC) is not needed to create or use one. Syntax int FillRect(Ī pointer to a RECT structure that contains the logical coordinates of the rectangle to be filled.Ī handle to the brush used to fill the rectangle. Introduction Regions are a resource in windows that are very useful. This function includes the left and top borders, but excludes the right and bottom borders of the rectangle. IRet = SetWindowPos(hwndDlg, HWND_TOPMOST, iX, iY, bmpInfo.bmWidth,įinally, render the bitmap image into the region by calling the function BitBlt.īitBlt(hdcDest, 0, 0, bmpInfo.bmWidth, bmpInfo.The FillRect function fills a rectangle by using the specified brush. IRet = CombineRgn(hRgn, hRgn, hRgnTemp, RGN_OR) Īfter the region is created, the window region is set by calling SetWindowRgn, iRet = SetWindowRgn(hwndDlg, hRgn, TRUE) Īnd its position is set by calling SetWindowPos: HRGN hRgnTemp = CreateRectRgn(iLeftX, iY, iX, iY+1) While (iX < bmpInfo.bmWidth & GetPixel(hdcMem, iX, iY) ! While (iX < bmpInfo.bmWidth & GetPixel(hdcMem, iX, iY) skip over transparent pixels at start of lines. areas of the bitmap not used to create the window will be blackĬOLORREF crTransparent = RGB(255, 255, 255) įor (int iY = 0 iY < bmpInfo.bmHeight iY++) ex - RGB(0,0,0) will mean a transparency color of black. If the function succeeds, the return value is TRUE. The RGB color in the source bitmap to treat as transparent. change the pixel values for a different transparency color The TransparentBlt function performs a bit-block transfer of the color data corresponding to a rectangle of pixels from the specified source device context into a destination device context. Create a region from a bitmap with transparency colour of white For all the other color values, their corresponding logical coordinates are used to create the region. To create the region, the bitmap data is scanned and all the RGB color values corresponding to the transparent color are skipped from processing. ![]() HANDLE hBitmap = (HBITMAP)LoadImage(GetModuleHandle(NULL), This includes loading the bitmap image file into memory and obtaining information about the bitmap image (such as the width and height of the image.) The next step is creating the region window. than trying to figure out why the srpm did not install out of the box. We start by creating a modeless dialog box: add client caps (ie: transparency) detect when the window uses 32-bit visuals. Transparent areas present some difficulty, since versions of Windows. So, the program will skip all the bitmap data corresponding to this color for processing. Microsoft Products and Processes 717 Win32 allows Windows applications to have a. For example, white means a pixel RGB value of RGB(255,255,255). This bitmap must have, apart from other colors used, one color that is to be interpreted as a transparent color by the application program. The first requirement is to create a bitmap image using image editors such as MSPaint, Photoshop, and so forth. The transparent pixel is a particular color value of the pixel that is not used to create the window. For subsequent non-transparent pixels, the region is combined with the previous one. It makes the background of the inner rectangle transparent or opaque in function of the user's input. An inner rectangle using a hatch brush with red horizontal lines and yellow background. The basic scheme is to scan a bitmap image data, skip over the transparent pixels, and create the region when a non-transparent pixel is found. An outer rectangle using a solid brush with blue background. ![]() This article shows how to create a shaped window using a bitmap image file and using the mouse to drag it. ![]()
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