driedfruit/sdl_savepng

Minimal libpng interface to save SDL_Surfaces as PNG files.

sdl_savepng's Issues

convert from abgr to argb

I find some times if you want to save a surface is not argb format(such as abgr), the saved png is not what you want. So I temporarily add some convert code to the save function

define amask 0xFF000000

define rmask 0x00FF0000

define gmask 0x0000FF00

define bmask 0x000000FF

int SDL_SavePNG_RW(SDL_Surface *src, SDL_RWops *dst, int freedst)
{

SDL_Surface *surface = SDL_CreateRGBSurface(0, src->w, src->h, 32,
    rmask, gmask, bmask, amask);
SDL_Rect rect = {0, 0, src->w, src->h};
SDL_LowerBlit(src, &rect, surface, &rect);

Setting Pixels Per Inch

Hi, I've been trying to find a way to set pixels per inch, but despite my best efforts there's nothing available. Do you have any knowhow about how to set them? I'd love to see PPI as an option in a custom version of this library, thanks!

Compress to char*?

Hi, I'm writing a networked application that would benefit from an easy way to compress a SDL surface to a character string, so it can be sent over a network socket. I haven't spent a ton of time dissecting this library, but I'm slowly making sense of the libPNG calls. If you would be able to create a function similar to SDL_SavePNG that performs a similar function but stores the output of the compressed image in a string of char (or uchar or uint8_t), that would be extremely useful.

Right now, I'm copying uncompressed data over the network. I guess I can use zlib or something to reduce bandwidth, but the app saves in PNG, so native compression would be nice.

Thanks for your work! This library is dead simple and works great for saving files!