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#include "screen.h"
#include "common.h"
#include "serial.h"
#define SCREEN_LINE_COUNT 25
#define SCREEN_COLUMN_COUNT 80
static unsigned char *videoStart = (unsigned char*)0xB8000;
static uint16 gCurrentLine = 0;
static uint16 gCurrentColumn = 0;
static uint8 gColor = 0x0A;
void Screen_FlushFromTty(Tty* tty)
{
memcpy(videoStart, tty->buffer, SCREEN_LINE_COUNT * SCREEN_COLUMN_COUNT * 2);
Screen_MoveCursor(tty->currentLine, tty->currentColumn);
}
void Screen_Print(int row, int column, const char* text)
{
unsigned char * video = videoStart;
video += (row * SCREEN_COLUMN_COUNT + column) * 2;
while(*text != 0)
{
*video++ = *text++;
*video++ = gColor;
}
}
void Screen_SetActiveColor(uint8 color)
{
gColor = color;
}
void Screen_ApplyColor(uint8 color)
{
gColor = color;
unsigned char * video = videoStart;
int i = 0;
for (i = 0; i < SCREEN_LINE_COUNT * SCREEN_COLUMN_COUNT; ++i)
{
video++;
*video++ = gColor;
}
}
void Screen_Clear()
{
unsigned char * video = videoStart;
int i = 0;
for (i = 0; i < SCREEN_LINE_COUNT * SCREEN_COLUMN_COUNT; ++i)
{
*video++ = 0;
*video++ = gColor;
}
gCurrentLine = 0;
gCurrentColumn = 0;
}
void Screen_MoveCursor(uint16 line, uint16 column)
{
// The screen is 80 characters wide...
uint16 cursorLocation = line * SCREEN_COLUMN_COUNT + column;
outb(0x3D4, 14); // Tell the VGA board we are setting the high cursor byte.
outb(0x3D5, cursorLocation >> 8); // Send the high cursor byte.
outb(0x3D4, 15); // Tell the VGA board we are setting the low cursor byte.
outb(0x3D5, cursorLocation); // Send the low cursor byte.
gCurrentColumn = column;
gCurrentLine = line;
}
void Screen_SetCursorVisible(BOOL visible)
{
uint8 cursor = inb(0x3d5);
if (visible)
{
cursor &= ~0x20;//5th bit cleared when cursor visible
}
else
{
cursor |= 0x20;//5th bit set when cursor invisible
}
outb(0x3D5, cursor);
}
void Screen_GetCursor(uint16* line, uint16* column)
{
*line = gCurrentLine;
*column = gCurrentColumn;
}
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