SDLSurface image SDLLoadBMP ('image. This function takes the same parameters as SDL_BlitSurface(), except that it takes into account the width and height of the destination rectangle. We can now load the image from disk using the SDLLoadBMP () function, which takes a path to a bitmap and loads it into an SDLSurface: 1. To stretch or scale your bitmap to fit an arbitrary area, you can use the function SDL_BlitScaled(). This means that the blitted image will be the same size every time. However, I mentioned that only the x and y coordinates of the destination rectangle are taken into account. With SDL_BlitSurface(), you can stamp bitmaps anywhere you wish. Image2 = SDL_ConvertSurface( temp2, winSurface->format, 0 ) This should use only 1 temp surface, but for conciseness we use two Temporary surfaces to load images into SDL_BlitScaled( image2, NULL, winSurface, &dest ) Blit image to scaled portion of window We have seen in past articles how we can load basic image formats (such as BMP, PNG and JPG) using SDL2 and SDLimage 2.0. This function is available since SDL_image 2.0.0.SDL_BlitSurface( image1, NULL, winSurface, NULL ) When done with the returned surface, the app should dispose of it with a call to SDL_FreeSurface(). The problem which occurs now is when I try to load a file with a different format than '.bmp'. If you are using SDL's 2D rendering API, there is an equivalent call to load images directly into an SDL_Texture for use by the GPU without using a software surface: call IMG_LoadTextureTyped_RW() instead. I asked a similar question a while ago where I asked how I could load different formats with SDL2image.h which helped me load images in my SDL program. There is also IMG_Load_RW(), which is equivalent to this function except that it will rely on SDL_image to determine what type of data it is loading, much like passing a NULL for type. This link show you how to set up SDL library/libpng16-16.dll to be available for acceess by the compiler.exe (the last step right before the sample code) yourProgram proprety page -> Builds event-> post-build event. Remarks An SDLSurface is a buffer of pixels in memory accessible by the CPU. Syntax SDLSurface IMGLoad (const char file) Function Parameters Return Value Returns a new SDL surface, or NULL on error. There is a separate function to read files from disk without having to deal with SDL_RWops: IMG_Load("filename.jpg") will call this function and manage those details for you, determining the file type from the filename's extension. Maybe there is some other simple method to create transparent empty texture in SDL2 something like x/y-sized fully transparent png but loading having such image in file is little bit pointless :/ c++ opengl sdl graphic Share. Load an image from a filesystem path into a software surface. If type is NULL, SDL_image will rely solely on its ability to guess the format. SDL_image reads everything it needs from the RWops during this call in any case.Įven though this function accepts a file type, SDL_image may still try other decoders that are capable of detecting file type from the contents of the image data, but may rely on the caller-provided type string for formats that it cannot autodetect. If freesrc is non-zero, the RWops will be closed before returning, whether this function succeeds or not. You can enable RLE acceleration on the surface afterwards by calling: SDL_SetColorKey(image, SDL_RLEACCEL, image->format->colorkey) include < SDL2/SDL. If the image format supports a transparent pixel, SDL will set the colorkey for the surface. so I was following this tutorial, and everything was going all smooth and dandy, until I encountered a problem, namely that I couldnt load a. You can inspect an SDL_Surface for its specifics, and use SDL_ConvertSurface to then migrate to any supported format. There are no guarantees about what format the new SDL_Surface data will be in many cases, SDL_image will attempt to supply a surface that exactly matches the provided image, but in others it might have to convert (either because the image is in a format that SDL doesn't directly support or because it's compressed data that could reasonably uncompress to various formats and SDL_image had to pick one). Use this if you plan to hand the data to something else or manipulate it further in code. RemarksĪn SDL_Surface is a buffer of pixels in memory accessible by the CPU. Returns a new SDL surface, or NULL on error. Non-zero to close/free the SDL_RWops before returning, zero to leave it open.Ī filename extension that represent this data ("BMP", "GIF", "PNG", etc). SDL_Surface * IMG_LoadTyped_RW(SDL_RWops *src, int freesrc, const char *type) Function Parameters srcĪn SDL_RWops that data will be read from.
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