gmenu2x/src/imageio.h

#ifndef IMAGEIO_H
#define IMAGEIO_H

#include <string>

struct SDL_Surface;

/** Loads an image from a PNG file into a newly allocated 32bpp RGBA surface.
  */
SDL_Surface *loadPNG(const std::string &path, bool loadAlpha = true);

#endif
Isolate all PNG loading in a separate source/header. This is in preparation of replacing SDL_image with direct use of libpng. 2011-03-30 04:21:31 +03:00			`#ifndef IMAGEIO_H`
			`#define IMAGEIO_H`

			`#include <string>`

			`struct SDL_Surface;`

PNG: Make loadPNG() responsible for creating an RGBA surface. Before this commit loadPNG() could return any surface format and the caller was responsible for converting it to the desired format. However, in practice all callers want a surface with an alpha channel and SDL only supports that with 32bpp surfaces, so RGBA or a permutation thereof. So I changed the contract for loadPNG() so it is required to return an RGBA surface, and removed the conversion code in the callers. The next step is to replace IMG_Load() by a function that calls libpng directly and loads a fixed 32bpp pixel format. That way, we can drop the SDL_image dependency and avoid unnecessary pixel format conversions. 2011-06-02 07:19:21 +03:00			`/** Loads an image from a PNG file into a newly allocated 32bpp RGBA surface.`
			`*/`
Fix issues with loading images with alpha disabled. These issues are fixed: * loadPNG gave RGBA surfaces unconditionally. Now it gives RGB surfaces if its second parameter, defaulting to true, is false. This fixes adding per- surface alpha values, because an RGBA surface ignores its per-surface value. * Surface::loadImage is updated to receive a third parameter, defaulting to true, to determine whether alpha is loaded. * SurfaceCollection::defaultAlpha was never used. * SurfaceCollection::defaultAlpha defaulted to false, so even if it were used, it would have loaded images without alpha. 2014-07-13 23:47:45 +03:00			`SDL_Surface *loadPNG(const std::string &path, bool loadAlpha = true);`
Isolate all PNG loading in a separate source/header. This is in preparation of replacing SDL_image with direct use of libpng. 2011-03-30 04:21:31 +03:00
			`#endif`