video.c File Reference

#include "precomp.h"

Include dependency graph for video.c:

Go to the source code of this file.

Macros
#define	FONT_HEIGHT   16

Functions
VOID NTAPI	LlbVideoDrawChar (IN UCHAR c, IN PUSHORT Buffer, IN USHORT Color, IN USHORT BackColor)
VOID NTAPI	LlbVideoClearScreen (IN BOOLEAN OsLoader)
VOID NTAPI	LlbVideoPutChar (IN UCHAR c)

Variables
CHAR	LlbHwBootFont []
ULONG	ScreenCursor

Macro Definition Documentation

FONT_HEIGHT

#define FONT_HEIGHT   16

Definition at line 11 of file video.c.

Function Documentation

LlbVideoClearScreen()

VOID NTAPI LlbVideoClearScreen

(

IN BOOLEAN

OsLoader

)

Definition at line 310 of file video.c.

{
    ULONG ScreenSize, p;
    ULONG BackColor;
    PUSHORT VideoBuffer;
 
    /* Get frame buffer and reset cursor position */
    VideoBuffer = LlbHwGetFrameBuffer();
    ScreenCursor = 0;
 
    /* Backcolor on this machine */
    if (OsLoader)
    {
        /* Black */
        BackColor = 0;
    }
    else
    {
        /* Deep blue */
#ifdef BLUE_SCREEN
        BackColor = LlbHwVideoCreateColor(14, 0, 82);
#else
        BackColor = LlbHwVideoCreateColor(0, 0, 0);
#endif
        BackColor = (BackColor << 16) | BackColor;
    }
 
    /* Screen size on this machine */
    ScreenSize = LlbHwGetScreenWidth() * LlbHwGetScreenHeight();
 
    /* Clear the screen with the given color */
    for (p = 0; p < ScreenSize * 2; p += 4)
    {
        *(PULONG)((PCHAR)VideoBuffer + p) = BackColor;
    }
}

Referenced by LlbFwVideoClearScreen(), and LlbStartup().

LlbVideoDrawChar()

VOID NTAPI LlbVideoDrawChar	(	IN UCHAR	c,
		IN PUSHORT	Buffer,
		IN USHORT	Color,
		IN USHORT	BackColor
	)

Definition at line 277 of file video.c.

{
    PCHAR Pixels;
    CHAR Line;
    ULONG y, ScreenWidth;
    LONG x;
 
    /* Get screen width */
    ScreenWidth = LlbHwGetScreenWidth();
    Pixels = LlbHwBootFont + c * FONT_HEIGHT;
 
    /* Loop y pixels */
    for (y = 0; y < FONT_HEIGHT; y++)
    {
        /* Loop x pixels */
        Line = *Pixels++;
        for (x = 7; x >= 0; x--)
        {
            /* Draw either a character or background pixel */
            Buffer[x] = (Line & 1) ? Color : BackColor;
            Line >>= 1;
        }
 
        /* Next line */
        Buffer += ScreenWidth;
    }
}

Referenced by LlbFwVideoPutChar(), and LlbVideoPutChar().

LlbVideoPutChar()

VOID NTAPI LlbVideoPutChar

(

IN UCHAR

c

)

Definition at line 349 of file video.c.

{
    ULONG cx, cy, CharsPerLine, BackColor, ScreenWidth;
 
    /* Backcolor on this machine */
#ifdef BLUE_SCREEN
      BackColor = LlbHwVideoCreateColor(14, 0, 82);
#else
      BackColor = LlbHwVideoCreateColor(0, 0, 0);
#endif
 
    /* Amount of characters in a line */
    ScreenWidth = LlbHwGetScreenWidth();
    CharsPerLine = ScreenWidth / 8;
 
    /* Handle new line and scrolling */
    if (c == '\n')
    {
        /* Move a line down */
        ScreenCursor += CharsPerLine - (ScreenCursor % CharsPerLine);
 
        /* FIXME: Scrolling */
    }
    else
    {
        /* Calculate character position from pixel position */
        cy = (ScreenCursor / CharsPerLine) * FONT_HEIGHT;
        cx = (ScreenCursor % CharsPerLine) * 8;
 
        /* Draw the character and increment the cursor */
        LlbVideoDrawChar(c,
                         (PUSHORT)LlbHwGetFrameBuffer() + ScreenWidth * cy + cx,
                         0xFFFF,
                         BackColor);
        ScreenCursor++;
    }
}

Referenced by LlbFwPutChar(), and putchar().

Variable Documentation

LlbHwBootFont

CHAR LlbHwBootFont[]

Definition at line 13 of file video.c.

Referenced by LlbVideoDrawChar().

ScreenCursor

ULONG ScreenCursor

Definition at line 273 of file video.c.

Referenced by LlbVideoClearScreen(), and LlbVideoPutChar().