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[USETUP] Do a trick to avoid visual "blinking" during screen clearing. (#3255)

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CORE-17312

Hide everything under the same foreground & background colors, so that
the actual color and text blanking reset does not create a visual "blinking".
Then, blank the text and finally reset the actual foreground &
background colors.

We do this because we cannot do the screen scrolling trick that would
allow to change both the text and the colors at the same time (the
function is currently not available in our console "emulation" layer).
This commit is contained in:
Hermès Bélusca-Maïto 2020-10-02 00:11:32 +02:00
parent 66302e477c
commit 434fa562ce
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GPG key ID: 3B2539C65E7B93D0
1 changed files with 16 additions and 1 deletions
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17
base/setup/usetup/consup.c
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@ -235,17 +235,32 @@ CONSOLE_ClearScreen(VOID)
coPos.X = 0;
coPos.Y = 0;
/*
* Hide everything under the same foreground & background colors, so that
* the actual color and text blanking reset does not create a visual "blinking".
* We do this because we cannot do the screen scrolling trick that would
* allow to change both the text and the colors at the same time (the
* function is currently not available in our console "emulation" layer).
*/
FillConsoleOutputAttribute(StdOutput,
FOREGROUND_WHITE | BACKGROUND_BLUE,
FOREGROUND_BLUE | BACKGROUND_BLUE,
xScreen * yScreen,
coPos,
&Written);
/* Blank the text */
FillConsoleOutputCharacterA(StdOutput,
' ',
xScreen * yScreen,
coPos,
&Written);
/* Reset the actual foreground & background colors */
FillConsoleOutputAttribute(StdOutput,
FOREGROUND_WHITE | BACKGROUND_BLUE,
xScreen * yScreen,
coPos,
&Written);
}
VOID