917722cf70
This change adds the display(1) graphical user interface and desktop environment with basic windowing support and the graphical terminal(1) emulator along with integrations in chkblayout(1), chvideomode(1), sysinstall(8), sysupgrade(8), as well as the games and ports. Adopt the Aurora procedural wallpaper in display(1) and login(8). Remove the obsolete dispd. Juhani contributed keyboard and video mode APIs to the display protocol and other miscellaneous changes. dzwdz contributed the initial functioning window buttons, improved title bar, window tiling, and minor bug fixes Co-authored-by: Juhani Krekelä <juhani@krekelä.fi> Co-authored-by: dzwdz <kg67199@gmail.com>
38 lines
1.3 KiB
C
38 lines
1.3 KiB
C
/*
|
|
* Copyright (c) 2014, 2015, 2016 Jonas 'Sortie' Termansen.
|
|
*
|
|
* Permission to use, copy, modify, and distribute this software for any
|
|
* purpose with or without fee is hereby granted, provided that the above
|
|
* copyright notice and this permission notice appear in all copies.
|
|
*
|
|
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
|
|
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
|
|
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
|
|
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
|
|
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
|
|
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
|
|
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
|
|
*
|
|
* pixel.c
|
|
* Pixel functions.
|
|
*/
|
|
|
|
#include <stdint.h>
|
|
|
|
#include "pixel.h"
|
|
|
|
uint32_t blend_pixel(uint32_t bg_value, uint32_t fg_value)
|
|
{
|
|
union color_rgba8 fg; fg.value = fg_value;
|
|
union color_rgba8 bg; bg.value = bg_value;
|
|
if ( fg.a == 255 )
|
|
return fg.value;
|
|
if ( fg.a == 0 )
|
|
return bg.value;
|
|
union color_rgba8 ret;
|
|
ret.a = 255;
|
|
ret.r = ((255-fg.a)*bg.r + fg.a*fg.r) / 256;
|
|
ret.g = ((255-fg.a)*bg.g + fg.a*fg.g) / 256;
|
|
ret.b = ((255-fg.a)*bg.b + fg.a*fg.b) / 256;
|
|
return ret.value;
|
|
}
|