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slimbootloader
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Implement clear screen for GFX console 

Current GFX console provides no function to clear the screen. This
patch added this support using the standard ANSI escape sequence
in print string.
This commit is contained in:
Maurice Ma 2019-10-06 09:03:49 -07:00
parent 7ebc3279c5
commit f6f42702bc
1 changed files with 27 additions and 0 deletions
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27
BootloaderCommonPkg/Library/GraphicsLib/GraphicsLib.c
View File

@ -10,6 +10,8 @@
#include <Library/PrintLib.h>
#include <Library/MemoryAllocationLib.h>
#define ANSI_ESCAPE_SEQ_CLEAR_SCREEN (UINT8 *)"\x1b[2J"
CONST EFI_GRAPHICS_OUTPUT_BLT_PIXEL mColors[16] = {
//
// B G R
@ -169,6 +171,7 @@ InitFrameBufferConsole (
)
{
FRAME_BUFFER_CONSOLE *Console;
BOOLEAN ClearScreen;
if (GfxInfoHob == NULL) {
return EFI_INVALID_PARAMETER;
@ -180,6 +183,10 @@ InitFrameBufferConsole (
return EFI_INVALID_PARAMETER;
}
// Don't clear screen for the 1st time to enter Shell
// so that the logo will stay on screen.
ClearScreen = (mFbConsole.TextDisplayBuf != NULL) ? TRUE : FALSE;
Console = &mFbConsole;
Console->GfxInfoHob = GfxInfoHob;
Console->OffX = OffX;
@ -197,6 +204,11 @@ InitFrameBufferConsole (
Console->TextSwapBuf = AllocateZeroPool (Console->Rows * Console->Cols);
ASSERT (Console->TextSwapBuf != NULL);
if (ClearScreen) {
// Clear screen using standard ANSI Escape Sequences 'ESC[2J'
FrameBufferWrite (ANSI_ESCAPE_SEQ_CLEAR_SCREEN, 4);
}
return EFI_SUCCESS;
}
@ -296,6 +308,8 @@ FrameBufferWrite (
FRAME_BUFFER_CONSOLE *Console;
EFI_STATUS Status;
UINTN Pos;
UINTN Length;
EFI_PEI_GRAPHICS_INFO_HOB *GfxInfoHob;
if (Buffer == NULL) {
return 0;
@ -306,6 +320,19 @@ FrameBufferWrite (
return 0;
}
// Handle clear screen
if ((NumberOfBytes == 4) && (CompareMem (ANSI_ESCAPE_SEQ_CLEAR_SCREEN, Buffer, 4)) == 0) {
// Clear screen
SetMem (Console->TextDisplayBuf, Console->Rows * Console->Cols, 0);
// Zero framebuffer
GfxInfoHob = Console->GfxInfoHob;
Length = (GfxInfoHob->GraphicsMode.HorizontalResolution * GfxInfoHob->GraphicsMode.PixelsPerScanLine) * 4;
SetMem64 ((UINT32 *) (UINTN)(GfxInfoHob->FrameBufferBase), Length, 0);
Console->CursorX = 0;
Console->CursorY = 0;
return NumberOfBytes;
}
for (Pos = 0; Pos < NumberOfBytes; Pos++) {
// Continue on next line when cursor overflows columns
if (Console->CursorX >= Console->Cols) {