diff options
Diffstat (limited to 'hacks/glx/grab-ximage.h')
| -rw-r--r-- | hacks/glx/grab-ximage.h | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/hacks/glx/grab-ximage.h b/hacks/glx/grab-ximage.h index 2fd589f..22e51d2 100644 --- a/hacks/glx/grab-ximage.h +++ b/hacks/glx/grab-ximage.h @@ -1,6 +1,8 @@ /* grab-ximage.c --- grab the screen to an XImage for use with OpenGL. * xscreensaver, Copyright (c) 2001-2006 Jamie Zawinski <jwz@jwz.org> * + * Modified by Richard Weeks <rtweeks21@gmail.com> Copyright (c) 2020 + * * Permission to use, copy, modify, distribute, and sell this software and its * documentation for any purpose is hereby granted without fee, provided that * the above copyright notice appear in all copies and that both that @@ -73,4 +75,53 @@ void load_texture_async (Screen *, Window, GLXContext, void *closure), void *closure); +struct texture_loader_t; +typedef struct texture_loader_t texture_loader_t; + +/* Incremental Texture Loading + + The process works like load_texture_async, but split into multiple calls + to facilitate chunks of work fitted to animation idle periods. The + necessary calls are: + + * alloc_texture_loader - one call - allocates texture loader and starts + background loading of image + * step_texture_loader - multiple calls - each call processes part of the + image into an OpenGL texture; calls back to provided function when + texture is ready with image + * free_texture_loader - one call - frees the texture loader resources + and memory + + With the exception of the pointer to the loader and the time limit, all + arguments are the same types as used by load_texture_async. + */ +texture_loader_t *alloc_texture_loader (Screen *, Window, GLXContext, + int desired_width, int desired_height, + Bool mipmap_p, + GLuint texid); + +/* Give an incremental texture loader time to work + + The given callback function will be called (with the passed closure) if + the texture loader completes its work, and this callback will only be + made once during the lifetime of the texture loader. + + This function will return either when all work is complete or when a + processed "stripe" takes the elapsed time beyond allowed_seconds. + */ +void step_texture_loader (texture_loader_t *loader, + double allowed_seconds, + void (*callback) (const char *filename, + XRectangle *geometry, + int image_width, + int image_height, + int texture_width, + int texture_height, + void *closure), + void *closure); + +Bool texture_loader_failed (texture_loader_t *loader); + +void free_texture_loader (texture_loader_t *loader); + #endif /* __GRAB_XIMAGE_H__ */ |