brewpanel/sdlgui.c

/*****************************************************************************
 * Copyright (C) 2015
 *   
 * Michiel Broek <mbroek at mbse dot eu>
 *
 * This file is part of the mbsePi-apps emulator
 *
 * The gui code is based on the gui from the emulator ARAnyM,
 * Copyright (c) 2004 Petr Stehlik of ARAnyM dev team
 *
 * This progrm is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the
 * Free Software Foundation; either version 2, or (at your option) any
 * later version.
 *
 * mbsePi-apps 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
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License
 * along with mbsePi-apps; see the file COPYING.  If not, write to the Free
 * Software Foundation, 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
 *****************************************************************************/

#include "brewpanel.h"
#include "sdlgui.h"

#ifdef HAVE_SDL_SDL_H

#include "lcdfont10x16.h"


static SDL_Surface	*pSdlGuiScrn;            	/* Pointer to the actual main SDL screen surface 	*/
static SDL_Surface	*pFontGfx = NULL;        	/* The LCD font graphics 				*/
static int		fontwidth, fontheight;		/* Width & height of the actual font 			*/
TTF_Font                *pFont = NULL;			/* TTF font for buttons etc.				*/

extern int		my_shutdown;


/*-----------------------------------------------------------------------*/
/*
 * Load an 1 plane XBM into a 8 planes SDL_Surface.
 */
static SDL_Surface *SDLGui_LoadXBM(int w, int h, const char *pXbmBits)
{
    SDL_Surface	*bitmap;
    Uint8 	*dstbits;
    const Uint8 *srcbits;
    int		x, y, srcpitch, mask;

    srcbits = (Uint8 *)pXbmBits;

    /* Allocate the bitmap */
    if ((bitmap = SDL_CreateRGBSurface(SDL_SWSURFACE, w, h, 8, 0, 0, 0, 0)) == NULL) {
	syslog(LOG_NOTICE, "Failed to allocate bitmap: %s", SDL_GetError());
	return NULL;
    }

    srcpitch = ((w + 7) / 8);
    dstbits = (Uint8 *)bitmap->pixels;
    mask = 1;

    /* Copy the pixels */
    for (y = 0 ; y < h ; y++) {
	for (x = 0 ; x < w ; x++) {
	    dstbits[x] = (srcbits[x / 8] & mask) ? 1 : 0;
	    mask <<= 1;
	    mask |= (mask >> 8);
	    mask &= 0xFF;
	}
	dstbits += bitmap->pitch;
	srcbits += srcpitch;
    }

    return bitmap;
}


/*
 * Initialize the GUI.
 */
int SDLGui_Init(void)
{
    char	*Pt = NULL;

    SDL_Color blackWhiteColors[2] = {{255, 255, 255, 0}, {0, 0, 0, 0}};

    /* 
     * Initialize the LCD font graphics: 
     */
    pFontGfx = SDLGui_LoadXBM(lcdfont10x16_width, lcdfont10x16_height, lcdfont10x16_bits);
    if (pFontGfx == NULL) {
	syslog(LOG_NOTICE, "Error: Can not init font graphics!");
	return -1;
    }

    /* Set color palette of the LCD font graphics: */
    SDL_SetColors(pFontGfx, blackWhiteColors, 0, 2);

    /* Set font color 0 as transparent: */
    SDL_SetColorKey(pFontGfx, (SDL_SRCCOLORKEY|SDL_RLEACCEL), 0);

    if (TTF_Init() == -1) {
	syslog(LOG_NOTICE, "Could not init SDL_ttf");
	return -1;
    }

    /*
     * Load TTF font for the dialogs
     */
    Pt = calloc(1024, sizeof(char));
    sprintf(Pt, "%s", "/usr/share/fonts/TTF/DejaVuSans.ttf");
    if ((pFont = TTF_OpenFont(Pt, 14 )) == NULL) {
	sprintf(Pt, "%s", "/usr/share/fonts/truetype/ttf-dejavu/DejaVuSans.ttf");
	if ((pFont = TTF_OpenFont(Pt, 14 )) == NULL) {
	    sprintf(Pt, "%s", "/usr/share/fonts/truetype/freefont/DejaVuSans.ttf");
	    if ((pFont = TTF_OpenFont(Pt, 14 )) == NULL) {
		syslog(LOG_NOTICE, "Could not load DejaVuSans.ttf");
		return -1;
	    }
	}
    }
    syslog(LOG_NOTICE, "Using ttf font: %s\n", Pt);
    free(Pt);
    Pt = NULL;

    return 0;
}


/*
 * Uninitialize the GUI.
 */
int SDLGui_UnInit(void)
{
    if (pFont)
    	TTF_CloseFont(pFont);
    pFont = NULL;

    if (pFontGfx)
	SDL_FreeSurface(pFontGfx);
    pFontGfx = NULL;

    return 0;
}


/*
 * Inform the SDL-GUI about the actual SDL_Surface screen pointer and
 * prepare the font to suit the actual resolution.
 */
int SDLGui_SetScreen(SDL_Surface *pScrn)
{
    pSdlGuiScrn = pScrn;

    if (pFontGfx == NULL) {
	syslog(LOG_NOTICE, "Error: A problem with the font occured!");
	return -1;
    }

    /* Get the font width and height: */
    fontwidth = pFontGfx->w/16;
    fontheight = pFontGfx->h/16;
    
    return 0;
}


/*
 * Center a dialog so that it appears in the middle of the screen.
 * Note: We only store the coordinates in the root box of the dialog,
 * all other objects in the dialog are positioned relatively to this one.
 */
void SDLGui_CenterDlg(SGOBJ *dlg)
{
    dlg[0].x = (pSdlGuiScrn->w/1-dlg[0].w)/2;
    dlg[0].y = (pSdlGuiScrn->h/1-dlg[0].h)/2;
}


/*
 * Draw a text string using TTF
 */
static void SDLGui_TTF(int x, int y, const char *txt)
{
    SDL_Rect    	offset;
    SDL_Color		textColor = { 0, 0, 0 };
    SDL_Surface*	message = NULL;

    message = TTF_RenderText_Solid(pFont, txt, textColor);
    offset.x = x;
    offset.y = y;
    SDL_BlitSurface(message, NULL, pSdlGuiScrn, &offset);
    SDL_FreeSurface(message);
    message = NULL;
}


/*
 * Draw a dialog TTF text object.
 */
static void SDLGui_DrawTTF(const SGOBJ *tdlg, int objnum)
{
    int         x, y;

    x = (tdlg[0].x + tdlg[objnum].x);
    y = (tdlg[0].y + tdlg[objnum].y);
    SDLGui_TTF(x, y, tdlg[objnum].txt);
}


/*
 * Draw a text string.
 */
static void SDLGui_Text(int x, int y, const char *txt)
{
    int		i;
    char	c;
    SDL_Rect	sr, dr;

    for (i=0; txt[i]!=0; i++) {
	c = txt[i];
	sr.x=fontwidth*(c%16);
	sr.y=fontheight*(c/16);
	sr.w=fontwidth;
	sr.h=fontheight;
	dr.x=x+i*(fontwidth+2);
	dr.y=y;
	dr.w=fontwidth;
	dr.h=fontheight;
	SDL_BlitSurface(pFontGfx, &sr, pSdlGuiScrn, &dr);
    }
}


/*
 * Draw a dialog text object.
 */
static void SDLGui_DrawText(const SGOBJ *tdlg, int objnum)
{
    int		x, y;

    x = (tdlg[0].x + tdlg[objnum].x);
    y = (tdlg[0].y + tdlg[objnum].y);
    SDLGui_Text(x, y, tdlg[objnum].txt);
}


/*
 * Draw a dialog LCD object.
 */
static void SDLGui_DrawLCD(const SGOBJ *bdlg, int objnum)
{
    SDL_Rect    rect;
    int         x, y, w, h, offset, border = 4;
    Uint32      bg0 = SDL_MapRGB(pSdlGuiScrn->format, 94,147, 69);
    Uint32	bg1 = SDL_MapRGB(pSdlGuiScrn->format,156,235,  4);
    Uint32	bc  = SDL_MapRGB(pSdlGuiScrn->format, 32, 32, 32);
    Uint32      bg;

    /*
     * Width and height are given in character columns and rows,
     * so calculate the display size in pixels.
     */
    w = bdlg[objnum].w * (fontwidth + 2) + 10;
    h = bdlg[objnum].h * (fontheight + 2) + 4;

    if (bdlg[objnum].x == -1) {
	/*
	 * Auto center
	 */
	x = (bdlg[0].w - w) / 2;
    } else {
    	x = bdlg[objnum].x;
    }
    y = bdlg[objnum].y;
    if (objnum > 0) {           /* Since the root object is a box, too, */
	/* we have to look for it now here and only */
	x += bdlg[0].x;         /* add its absolute coordinates if we need to */
	y += bdlg[0].y;
    }

    if (bdlg[objnum].state & SG_SELECTED) {
	bg = bg1;
    } else {
	bg = bg0;
    }

    /* The root box should be bigger than the screen, so we disable the offset there: */
    if (objnum != 0)
	offset = border;
    else
	offset = 0;

    /* Draw background: */
    rect.x = x;
    rect.y = y;
    rect.w = w;
    rect.h = h;
    SDL_FillRect(pSdlGuiScrn, &rect, bg);

    /* Draw upper border: */
    rect.x = x - offset;
    rect.y = y - offset;
    rect.w = w + offset + offset;
    rect.h = border;
    SDL_FillRect(pSdlGuiScrn, &rect, bc);

    /* Draw left border: */
    rect.x = x - offset;
    rect.y = y;
    rect.w = border;
    rect.h = h;
    SDL_FillRect(pSdlGuiScrn, &rect, bc);

    /* Draw bottom border: */
    rect.x = x - offset;
    rect.y = y + h - border + offset;
    rect.w = w + offset + offset;
    rect.h = border;
    SDL_FillRect(pSdlGuiScrn, &rect, bc);

    /* Draw right border: */
    rect.x = x + w - border + offset;
    rect.y = y;
    rect.w = border;
    rect.h = h;
    SDL_FillRect(pSdlGuiScrn, &rect, bc);
}


/*
 * Draw a dialog box object.
 */
static void SDLGui_DrawBox(const SGOBJ *bdlg, int objnum)
{
    SDL_Rect	rect;
    int		x, y, w, h, offset, shade = 2;
    Uint32	grey = SDL_MapRGB(pSdlGuiScrn->format,192,192,192);
    Uint32	upleftc, downrightc;

    x = bdlg[objnum].x;
    y = bdlg[objnum].y;
    if (objnum > 0) {		/* Since the root object is a box, too, */
	/* we have to look for it now here and only */
	x += bdlg[0].x;		/* add its absolute coordinates if we need to */
	y += bdlg[0].y;
    }
    w = bdlg[objnum].w;
    h = bdlg[objnum].h;

    if (bdlg[objnum].state & SG_SELECTED) {
	upleftc = SDL_MapRGB(pSdlGuiScrn->format,128,128,128);
	downrightc = SDL_MapRGB(pSdlGuiScrn->format,255,255,255);
    } else {
	upleftc = SDL_MapRGB(pSdlGuiScrn->format,255,255,255);
	downrightc = SDL_MapRGB(pSdlGuiScrn->format,128,128,128);
    }

    /* The root box should be bigger than the screen, so we disable the offset there: */
    if (objnum != 0)
	offset = shade;
    else
	offset = 0;

    /* Draw background: */
    rect.x = x;
    rect.y = y;
    rect.w = w;
    rect.h = h;
    SDL_FillRect(pSdlGuiScrn, &rect, grey);

    /* Draw upper border: */
    rect.x = x;
    rect.y = y - offset;
    rect.w = w;
    rect.h = shade;
    SDL_FillRect(pSdlGuiScrn, &rect, upleftc);

    /* Draw left border: */
    rect.x = x - offset;
    rect.y = y;
    rect.w = shade;
    rect.h = h;
    SDL_FillRect(pSdlGuiScrn, &rect, upleftc);

    /* Draw bottom border: */
    rect.x = x;
    rect.y = y + h - shade + offset;
    rect.w = w;
    rect.h = shade;
    SDL_FillRect(pSdlGuiScrn, &rect, downrightc);

    /* Draw right border: */
    rect.x = x + w - shade + offset;
    rect.y = y;
    rect.w = shade;
    rect.h = h;
    SDL_FillRect(pSdlGuiScrn, &rect, downrightc);
}


/*
 * Draw a normal button.
 */
static void SDLGui_DrawButton(const SGOBJ *bdlg, int objnum)
{
    int		x, y, w, h;

    SDLGui_DrawBox(bdlg, objnum);
    /*
     * Use bold text and get outer dimensions of the text
     */
    TTF_SetFontStyle(pFont, TTF_STYLE_BOLD);
    TTF_SizeText(pFont, bdlg[objnum].txt, &w, &h);
    x = bdlg[0].x + bdlg[objnum].x + (bdlg[objnum].w - w) / 2;
    y = bdlg[0].y + bdlg[objnum].y + (bdlg[objnum].h - h) / 2;

    if (bdlg[objnum].state & SG_SELECTED) {
	x += 1;
	y += 1;
    }

    if ((bdlg[objnum].flags & SG_HIDE) == 0)
	SDLGui_TTF(x, y, bdlg[objnum].txt);
    TTF_SetFontStyle(pFont, TTF_STYLE_NORMAL);
}


/*
 * Draw a whole dialog.
 */
void SDLGui_DrawDialog(const SGOBJ *dlg)
{
    int i;
	
    for (i = 0; dlg[i].type != -1; i++) {
	switch (dlg[i].type) {
	    case SGBOX:
			SDLGui_DrawBox(dlg, i);
			break;
	    case SGLCD:
			SDLGui_DrawLCD(dlg, i);
			break;
	    case SGTEXT:
			SDLGui_DrawText(dlg, i);
			break;
	    case SGTTF:
			SDLGui_DrawTTF(dlg, i);
			break;
	    case SGBUTTON:
			SDLGui_DrawButton(dlg, i);
			break;
	}
    }

    SDL_UpdateRect(pSdlGuiScrn, 0,0,0,0);
}


/*
 * Search an object at a certain position.
 */
static int SDLGui_FindObj(const SGOBJ *dlg, int fx, int fy)
{
    int		len, i, ob = -1, xpos, ypos;

    len = 0;
    while (dlg[len].type != -1)
	len++;

    xpos = fx;
    ypos = fy;
    /* Now search for the object: */
    for (i = len; i >= 0; i--) {
	if (xpos >= dlg[0].x + dlg[i].x && ypos >= dlg[0].y + dlg[i].y && 
	    xpos < dlg[0].x + dlg[i].x + dlg[i].w && ypos < dlg[0].y + dlg[i].y + dlg[i].h) {
	    ob = i;
	    break;
	}
    }
	
    return ob;
}


/*
 * Search a button with a special flag (e.g. SG_DEFAULT or SG_CANCEL).
 */
static int SDLGui_SearchFlaggedButton(const SGOBJ *dlg, int flag)
{
    int i = 0;

    while (dlg[i].type != -1) {
	if (dlg[i].flags & flag)
	    return i;
	i++;
    }

    return 0;
}


/*
 * Show and process a dialog. Returns the button number that has been
 * pressed or SDLGUI_UNKNOWNEVENT if an unsupported event occured (will be
 * stored in parameter pEventOut).
 */
int SDLGui_DoDialog(SGOBJ *dlg, SDL_Event *pEventOut)
{
    int		obj = 0, oldbutton = 0, retbutton = 0, i, j, b;
    SDL_Event	sdlEvent;
    SDL_Surface	*pBgSurface;
    SDL_Rect	dlgrect, bgrect;

//	if (pSdlGuiScrn->h / fontheight < dlg[0].h)
//	{
//		syslog(LOG_NOTICE, "Screen size too small for dialog!");
//		return SDLGUI_ERROR;
//	}

    dlgrect.x = dlg[0].x;
    dlgrect.y = dlg[0].y;
    dlgrect.w = dlg[0].w;
    dlgrect.h = dlg[0].h;

    bgrect.x = bgrect.y = 0;
    bgrect.w = dlgrect.w;
    bgrect.h = dlgrect.h;

    /*
     * Save background
     */
    pBgSurface = SDL_CreateRGBSurface(SDL_SWSURFACE, dlgrect.w, dlgrect.h, pSdlGuiScrn->format->BitsPerPixel,
	                                  pSdlGuiScrn->format->Rmask, pSdlGuiScrn->format->Gmask, pSdlGuiScrn->format->Bmask, pSdlGuiScrn->format->Amask);
    if (pSdlGuiScrn->format->palette != NULL) {
	SDL_SetColors(pBgSurface, pSdlGuiScrn->format->palette->colors, 0, pSdlGuiScrn->format->palette->ncolors-1);
    }

    if (pBgSurface != NULL) {
	SDL_BlitSurface(pSdlGuiScrn,  &dlgrect, pBgSurface, &bgrect);
    } else {
	syslog(LOG_NOTICE, "SDLGUI_DoDialog: CreateRGBSurface failed: %s", SDL_GetError());
    }

    /* (Re-)draw the dialog */
    SDLGui_DrawDialog(dlg);

    /* 
     * Is the left mouse button still pressed? Yes -> Handle TOUCHEXIT objects here
     */
    SDL_PumpEvents();
    b = SDL_GetMouseState(&i, &j);
    obj = SDLGui_FindObj(dlg, i, j);
    if (obj > 0 && (dlg[obj].flags & SG_TOUCHEXIT) ) {
	oldbutton = obj;
	if (b & SDL_BUTTON(1)) {
	    dlg[obj].state |= SG_SELECTED;
	    retbutton = obj;
	}
    }

    /* The main loop */
    while (retbutton == 0 && !my_shutdown) {
	if (SDL_WaitEvent(&sdlEvent) == 1)  /* Wait for events */
	    switch (sdlEvent.type) {
		case SDL_QUIT:
				retbutton = SDLGUI_QUIT;
				break;

		case SDL_MOUSEBUTTONDOWN:
				if (sdlEvent.button.button != SDL_BUTTON_LEFT) {
				    /* Not left mouse button -> unsupported event */
				    if (pEventOut)
					retbutton = SDLGUI_UNKNOWNEVENT;
				    break;
				}
				/* It was the left button: Find the object under the mouse cursor */
				obj = SDLGui_FindObj(dlg, sdlEvent.button.x, sdlEvent.button.y);
				if (obj > 0) {
				    if (dlg[obj].type == SGBUTTON) {
					dlg[obj].state |= SG_SELECTED;
					SDLGui_DrawButton(dlg, obj);
					SDL_UpdateRect(pSdlGuiScrn, dlg[0].x + dlg[obj].x - 2, dlg[0].y + dlg[obj].y - 2, dlg[obj].w + 4, dlg[obj].h + 4);
					oldbutton=obj;
				    }
				    if ( dlg[obj].flags & SG_TOUCHEXIT ) {
					dlg[obj].state |= SG_SELECTED;
					retbutton = obj;
				    }
				}
				break;

			 case SDL_MOUSEBUTTONUP:
				if (sdlEvent.button.button != SDL_BUTTON_LEFT) {
				    /* Not left mouse button -> unsupported event */
				    if (pEventOut)
					retbutton = SDLGUI_UNKNOWNEVENT;
				    break;
				}
				/* It was the left button: Find the object under the mouse cursor */
				obj = SDLGui_FindObj(dlg, sdlEvent.button.x, sdlEvent.button.y);
				if (obj > 0) {
				    switch (dlg[obj].type) {
					case SGBUTTON:
						if (oldbutton==obj)
						    retbutton=obj;
						break;
				    }
				}
				if (oldbutton > 0) {
				    dlg[oldbutton].state &= ~SG_SELECTED;
				    SDLGui_DrawButton(dlg, oldbutton);
				    SDL_UpdateRect(pSdlGuiScrn, (dlg[0].x+dlg[oldbutton].x)*fontwidth-2, (dlg[0].y+dlg[oldbutton].y)*fontheight-2,
						dlg[oldbutton].w*fontwidth+4, dlg[oldbutton].h*fontheight+4);
				    oldbutton = 0;
				}
				if (obj >= 0 && (dlg[obj].flags & SG_EXIT)) {
				    retbutton = obj;
				}
				break;

			 case SDL_MOUSEMOTION:
				break;

			 case SDL_KEYDOWN:                     /* Key pressed */
				if (sdlEvent.key.keysym.sym == SDLK_RETURN || sdlEvent.key.keysym.sym == SDLK_KP_ENTER) {
				    retbutton = SDLGui_SearchFlaggedButton(dlg, SG_DEFAULT);
				} else if (sdlEvent.key.keysym.sym == SDLK_ESCAPE) {
				    retbutton = SDLGui_SearchFlaggedButton(dlg, SG_CANCEL);
				} else if (pEventOut) {
				    retbutton = SDLGUI_UNKNOWNEVENT;
				}
				break;

			 default:
				if (pEventOut)
				    retbutton = SDLGUI_UNKNOWNEVENT;
				break;
	    }
    }

    /* Restore background */
    if (pBgSurface) {
	SDL_BlitSurface(pBgSurface, &bgrect, pSdlGuiScrn,  &dlgrect);
	SDL_FreeSurface(pBgSurface);
    }

    /* Copy event data of unsupported events if caller wants to have it */
    if (retbutton == SDLGUI_UNKNOWNEVENT && pEventOut)
	memcpy(pEventOut, &sdlEvent, sizeof(SDL_Event));

    if (retbutton == SDLGUI_QUIT)
	my_shutdown = TRUE;

    return retbutton;
}


void SDLGui_LCDwrite(SGOBJ *dlg, int x, int y, Uint8 c, int lcdindex)
{
    int		i, index;

    fprintf(stdout, "SDLGui_LCDwrite( , %d, %d, %c, %d)\n", x, y, c, lcdindex);

    i = index = 0;
    for (;;) {
	if (dlg[i].type == -1) {
	    syslog(LOG_NOTICE, "SDLGui_LCDwrite() lcdindex=%d not found", lcdindex);
	    return;
	}
	if (dlg[i].type == SGLCD) {
	    if (index == lcdindex)
		break;
	    index++;
	}
	i++;
    }
    fprintf(stdout, "SDLGui_LCDwrite i=%d LCD=%dx%d\n", i, dlg[i].w, dlg[i].h);

}

#endif