Util.c

/*
        Advanved Dialogs v1.0.7
        Copyright (C) 2005-2008 Jonas Gehring

        Advanced Dialogs is free software; you can redistribute it and/or modify
        it under the terms of the GNU Lesser General Public License as published by
        the Free Software Foundation; either version 2 of the License, or
        (at your option) any later version.

        Advanced Dialogs is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU Lesser General Public License for more details.

        You should have received a copy of the GNU Lesser General Public License
        along with this program.  If not, see <http://www.gnu.org/licenses/>.
*/


// C Source File
// Created 29.08.2005; 23:03:04


#include <extgraph.h>                                                   // ExtGraph by TI-Chess Team

#include "AdvDialogs.h"                                                 // This should be obvious ;)
#include "Internal.h"                                                   // This header should not be included in programs using Advanced Dialogs


#ifndef OSdequeue
#define OSdequeue _rom_call(short,(__pushort,void*),3AA)
#endif


// Clears the keyboard queue
void ClearKbdQueue(void)
{
        while (_rowread(0)) continue;
}


// Waits for a keypress and stores it in key
void GetKey(void *kbq, short *key)
{
        // Wait for keypress and mask out key repitition
        while (OSdequeue(key, kbq)) continue;
        *key &= 0xF7FF;
}


// Draws a colored string (black or white)
void GrayDrawColorString(short x, short y, const char *str, uchar color, uchar mode)
{
        if (color == COLOR_WHITE)
        {       
                GraySetAMSPlane(LIGHT_PLANE);
                DrawStr((mode == TXT_CENTERED ? (LCD_WIDTH - DrawStrWidth(str, F_4x6)) >> 1 : x), y, str, A_XOR);
        }
        else
        {
                GrayDrawStrExt(x, y, str, A_NORMAL | (mode == TXT_CENTERED ? A_CENTERED : 0), F_4x6);
        }
}


// Save grayscale screen contents
void SaveScreen(void)
{
        if (tscr == NULL)
        {
                // Allocate space for the LCD buffers
                if ((tscr = malloc(sizeof(LCD_BUFFER)*2)) == NULL)
                {
                        return;
                }
                
                // Save contents
                FastCopyScreen_R(GrayGetPlane(LIGHT_PLANE), tscr);
                FastCopyScreen_R(GrayGetPlane(DARK_PLANE), tscr+sizeof(LCD_BUFFER));    
        }
}


// Restore grayscale screen contents
void RestoreScreen(void)
{
        if (tscr)
        {
                FastCopyScreen_R(tscr, GrayGetPlane(LIGHT_PLANE));
                FastCopyScreen_R(tscr+sizeof(LCD_BUFFER), GrayGetPlane(DARK_PLANE));
                free(tscr);
                tscr = NULL;
        }
}

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