message.c File Reference

#include <windows.h>
#include "globals.h"
#include "message.h"
#include "matrix.h"

Include dependency graph for message.c:

Go to the source code of this file.

Functions
WORD	crc_msgrand (WORD reg)
void	SetMatrixMessage (MATRIX_MESSAGE *msg, HFONT hFont, TCHAR *text)
void	DrawMatrixMessage (MATRIX *matrix, MATRIX_MESSAGE *msg, HDC hdc)
void	RevealMatrixMessage (MATRIX_MESSAGE *msg, int amount)
void	ClearMatrixMessage (MATRIX_MESSAGE *msg)
int	MessageSpeed ()
void	DoMatrixMessage (HDC hdc, MATRIX *matrix)
void	SetMessageFont (HWND hwnd, TCHAR *szFontName, int nPointSize, BOOL fBold)
MATRIX_MESSAGE *	InitMatrixMessage (HWND hwnd, int width, int height)

Function Documentation

ClearMatrixMessage()

void ClearMatrixMessage

(

MATRIX_MESSAGE *

msg

)

Definition at line 129 of file message.c.

{
    int x, y;

    for(x = 0; x < msg->width; x++)
        for(y = 0; y < msg->height; y++)
            msg->message[x][y] = 0;
}

Referenced by DoMatrixMessage(), and InitMatrixMessage().

crc_msgrand()

WORD crc_msgrand

(

WORD

reg

)

Definition at line 23 of file message.c.

{
    const WORD mask = 0xb400;

    if(reg & 1)
        reg = (reg >> 1) ^ mask;
    else
        reg = (reg >> 1);

    return reg;
}

Referenced by RevealMatrixMessage().

DoMatrixMessage()

void DoMatrixMessage	(	HDC	hdc,
		MATRIX *	matrix
	)

Definition at line 149 of file message.c.

{
    MATRIX_MESSAGE *msg = matrix->message;

    int RealSpeed = MessageSpeed();

    if(g_nNumMessages > 0)
    {
        // nothing to do yet..
        if(msg->counter++ < 0)
            return;

        // has counter reached limit..clear the message
        if(msg->counter++ == RealSpeed / 2 + (RealSpeed/4))
            ClearMatrixMessage(msg);

        // reset counter + display a new message
        if(msg->counter >= RealSpeed)
        {
            // mark all message-cells as being "invisible" so the
            // message gets cleared by the matrix decoding naturally

            if(g_fRandomizeMessages)
                msg->msgindex = crc_rand() % g_nNumMessages;
            else
                msg->msgindex = (msg->msgindex + 1) % g_nNumMessages;

            // make a new message..initially invisible
            SetMatrixMessage(msg, 0, g_szMessages[msg->msgindex]);

            msg->counter = -(int)(crc_rand() % MSGSPEED_MAX);
        }
        // reveal the next part of the message
        else if(msg->counter < RealSpeed / 2)
        {
            int w = (g_nMessageSpeed - MSGSPEED_MIN);
            w = (1 << 16) + ((w<<16) / MSGSPEED_MAX);
            w = (w * 3 * g_nMessageSpeed) >> 16;

            RevealMatrixMessage(msg, w + 100);
        }

        //
        // draw whatever part of the message is visible at this time
        //
        DrawMatrixMessage(matrix, msg, hdc);
    }
}

Referenced by DecodeMatrix().

DrawMatrixMessage()

void DrawMatrixMessage	(	MATRIX *	matrix,
		MATRIX_MESSAGE *	msg,
		HDC	hdc
	)

Definition at line 97 of file message.c.

{
    int x, y;

    for(x = 0; x < msg->width; x++)
        for(y = 0; y < msg->height; y++)
            if((msg->message[x][y] & 0x8000) &&
               (msg->message[x][y] & 0x00FF))
            {
                DrawGlyph(matrix, hdc, x * GLYPH_WIDTH, y * GLYPH_HEIGHT, RandomGlyph(MAX_INTENSITY));
            }
}

Referenced by DoMatrixMessage().

InitMatrixMessage()

MATRIX_MESSAGE* InitMatrixMessage	(	HWND	hwnd,
		int	width,
		int	height
	)

Definition at line 229 of file message.c.

{
    MATRIX_MESSAGE *msg;

    if((msg = malloc(sizeof(MATRIX_MESSAGE))) == 0)
        return 0;

    ClearMatrixMessage(msg);

    msg->msgindex = 0;
    msg->width    = min(width, MAXMSG_WIDTH);
    msg->height   = min(height, MAXMSG_HEIGHT);
    msg->counter  = -(int)(crc_rand() % MSGSPEED_MIN + MSGSPEED_MIN);

    msg->random_reg1 = (WORD)GetTickCount();

    SetMessageFont(hwnd, g_szFontName, g_nFontSize, g_fFontBold);

    SetMatrixMessage(msg, 0, g_szMessages[0]);

    return msg;
}

Referenced by CreateMatrix().

MessageSpeed()

int MessageSpeed

(

)

Definition at line 141 of file message.c.

{
    return (MSGSPEED_MAX-MSGSPEED_MIN) - (g_nMessageSpeed-MSGSPEED_MIN) + MSGSPEED_MIN;
}

Referenced by DoMatrixMessage().

RevealMatrixMessage()

void RevealMatrixMessage	(	MATRIX_MESSAGE *	msg,
		int	amount
	)

Definition at line 113 of file message.c.

{
    while(amount--)
    {
        int pos;

        msg->random_reg1 = crc_msgrand(msg->random_reg1);
        pos = msg->random_reg1 & 0xffff;

        msg->message[pos / 256][pos % 256] |= GLYPH_REDRAW;
    }
}

Referenced by DoMatrixMessage().

SetMatrixMessage()

void SetMatrixMessage	(	MATRIX_MESSAGE *	msg,
		HFONT	hFont,
		TCHAR *	text
	)

Definition at line 38 of file message.c.

{
    HDC     hdc;
    RECT    rect;
    int     x, y;

    HDC     hdcMessage;
    HBITMAP hbmMessage;

    HANDLE  hOldFont, hOldBmp;

    //
    // Create a monochrome off-screen buffer
    //
    hdc = GetDC(NULL);

    hdcMessage = CreateCompatibleDC(hdc);
    hbmMessage = CreateBitmap(MAXMSG_WIDTH, MAXMSG_HEIGHT, 1, 1, 0);
    hOldBmp    = SelectObject(hdcMessage, hbmMessage);

    ReleaseDC(NULL, hdc);

    //
    // Draw text into bitmap
    //
    SetRect(&rect, 0, 0, msg->width, MAXMSG_HEIGHT);
    FillRect(hdcMessage, &rect, GetStockObject(WHITE_BRUSH));

    hOldFont = SelectObject(hdcMessage, g_hFont);
    DrawText(hdcMessage, text, -1, &rect, DT_CENTER|DT_VCENTER|DT_WORDBREAK|DT_CALCRECT);

    OffsetRect(&rect, (msg->width-(rect.right-rect.left))/2, (msg->height-(rect.bottom-rect.top))/2);
    DrawText(hdcMessage, text, -1, &rect, DT_CENTER|DT_VCENTER|DT_WORDBREAK);

    //
    // Convert bitmap into an array of cells for easy drawing
    //
    for(y = 0; y < msg->height; y++)
    {
        for(x = 0; x < msg->width; x++)
        {
            msg->message[x][y] = GetPixel(hdcMessage, x, y) ? 0 : 1;
        }
    }

    //
    //  Cleanup
    //
    SelectObject(hdcMessage, hOldFont);
    SelectObject(hdcMessage, hOldBmp);

    DeleteDC(hdcMessage);
    DeleteObject(hbmMessage);
}

Referenced by DoMatrixMessage(), and InitMatrixMessage().

SetMessageFont()

void SetMessageFont	(	HWND	hwnd,
		TCHAR *	szFontName,
		int	nPointSize,
		BOOL	fBold
	)

Definition at line 201 of file message.c.

{
    int     lfHeight;
    HDC     hdc;
    HFONT   hFont;

    hdc = GetDC(hwnd);

    lfHeight = -MulDiv(nPointSize, GetDeviceCaps(hdc, LOGPIXELSY), 72);

    ReleaseDC(hwnd, hdc);

    hFont = CreateFont(lfHeight, 0, 0, 0, fBold ? FW_BOLD: FW_NORMAL, 0, 0, 0,
        ANSI_CHARSET, OUT_DEFAULT_PRECIS, CLIP_DEFAULT_PRECIS,
        ANTIALIASED_QUALITY, DEFAULT_PITCH, szFontName);

    if(hFont != 0)
    {
        if(g_hFont != 0)
            DeleteObject(g_hFont);

        g_hFont = hFont;
    }
}

Referenced by InitMatrixMessage(), and UpdatePreview().