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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2025 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU Lesser General Public License, as published by the Free Software
* Foundation; either version 2.1 of the License, or (at your option) any
* later version. Please see the file LICENSE-LGPL for details.
*
* Web Page: http://brltty.app/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <string.h>
#include "scr_utils.h"
#include "color.h"
const ScreenCharacter defaultScreenCharacter = {
.text = WC_C(' '),
.color.vgaAttributes = VGA_COLOR_DEFAULT,
};
void
toVGAScreenColor (ScreenColor *color) {
if (color->usingRGB) {
int foreground = rgbColorToVga(color->foreground, 0);
int background = rgbColorToVga(color->background, 1);
unsigned char attributes = (foreground << VGA_SHIFT_FG)
| (background << VGA_SHIFT_BG);
if (color->isBlinking) attributes |= VGA_BIT_BLINK;
if (color->isBold) attributes |= VGA_BIT_FG_BRIGHT;
memset(color, 0, sizeof(*color));
color->vgaAttributes = attributes;
}
}
void
toRGBScreenColor (ScreenColor *color) {
if (!color->usingRGB) {
unsigned char attributes = color->vgaAttributes;
memset(color, 0, sizeof(*color));
color->usingRGB = 1;
color->foreground = vgaToRgb(vgaGetForegroundColor(attributes));
color->background = vgaToRgb(vgaGetBackgroundColor(attributes));
if (attributes & VGA_BIT_BLINK) color->isBlinking = 1;
}
}
void
setScreenCharacterText (ScreenCharacter *characters, size_t count, wchar_t text) {
while (count > 0) {
characters[--count].text = text;
}
}
void
setScreenCharacterColor (ScreenCharacter *characters, size_t count, const ScreenColor *color) {
while (count > 0) {
characters[--count].color = *color;
}
}
void
clearScreenCharacters (ScreenCharacter *characters, size_t count) {
setScreenCharacterText(characters, count, defaultScreenCharacter.text);
setScreenCharacterColor(characters, count, &defaultScreenCharacter.color);
}
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