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Improved VGA scroll performance using memcpy(3).

This commit is contained in:
Jonas 'Sortie' Termansen 2012-07-17 16:22:21 +02:00
parent ebc0b064c3
commit 476ba278da
1 changed files with 13 additions and 14 deletions
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27
sortix/vgaterminal.cpp
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@ -24,9 +24,12 @@
#include <sortix/kernel/platform.h>
#include <sortix/kernel/log.h>
#include <libmaxsi/memory.h>
#include "vga.h"
#include "vgaterminal.h"
using namespace Maxsi;
namespace Sortix
{
namespace VGATerminal
@ -102,13 +105,11 @@ namespace Sortix
{
for ( nat y = 1; y < height; y++ )
{
for ( nat x = 0; x < width; x++ )
{
unsigned oldindex = y * width + x;
unsigned newindex = (y-1) * width + x;
vga[newindex] = vga[oldindex];
vgaattr[newindex] = vgaattr[oldindex];
}
size_t linesize = width * sizeof(uint16_t);
size_t fromoff = (y-0) * width;
size_t destoff = (y-1) * width;
Memory::Copy(vga + destoff, vga + fromoff, linesize);
Memory::Copy(vgaattr + destoff, vgaattr + fromoff, linesize);
}
for ( nat x = 0; x < width; x++ )
@ -124,13 +125,11 @@ namespace Sortix
{
for ( nat y = 1; y < height; y++ )
{
for ( nat x = 0; x < width; x++ )
{
unsigned oldindex = (y-1) * width + x;
unsigned newindex = y * width + x;
vga[newindex] = vga[oldindex];
vgaattr[newindex] = vgaattr[oldindex];
}
size_t linesize = width * sizeof(uint16_t);
size_t fromoff = (y-1) * width;
size_t destoff = (y-0) * width;
Memory::Copy(vga + destoff, vga + fromoff, linesize);
Memory::Copy(vgaattr + destoff, vgaattr + fromoff, linesize);
}
for ( nat x = 0; x < width; x++ )