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| Al_update_display_region questions |
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Bob Keane
Member #7,342
June 2006
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I was looking though the manual and found al_update_display_region. It looks like you can draw an image to the display and later add a smaller image. does anyone have a simple example using it? Also, the manual suggests using al_get_display_option to confirm your video card will support al_update_display_region. Can someone show code using it as well? Thanks. By reading this sig, I, the reader, agree to render my soul to Bob Keane. I, the reader, understand this is a legally binding contract and freely render my soul. |
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Elias
Member #358
May 2000
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ex_font is using al_update_display_region it seems. I believe nowadays it is always a synonym to al_flip_display though as OpenGL and DirectX work by just flipping the entire backbuffer. This function is a remnant of old-style windowing systems that could "optimize" display updating by redrawing just a portion of the screen. -- |
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RmBeer2
Member #16,660
April 2017
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al_update_display_region is used mainly for events like ALLEGRO_EVENT_DISPLAY_EXPOSE, which only shows the update in a fragment of the window, occurs when a portion of the window is shown again after being hidden with the border of another window or the border of the screen. 🌈🌈🌈 🌟 BlackRook WebSite (Only valid from my installer) 🌟 C/C++ 🌟 GNU/Linux 🌟 IceCream/Cornet 🌟 🌈🌈🌈 Rm Beer for Emperor 2021! Rm Beer for Ruinous Slave Drained 2022! Rm Beer for Traveler From The Future Warning Not To Enter In 2023! Rm Beer are building a travel machine for Go Back from 2023! Rm Beer in an apocalyptic world burning hordes of Zombies in 2024! |
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Peter Hull
Member #1,136
March 2001
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Probably you know this Bob but in the current docs, API functions list the examples that use them, if there are any. e.g.
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