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/********************************************************************************
* File: XDraw.cpp *
* Date: 20080805 *
* Author: Gaspar Fernández (helyo@totaki.com) *
* *
* Copyright (C) 2008 Gaspar Fernández *
* *
* This program 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 3 of the License, or *
* (at your option) any later version. *
* *
* This program 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 this program. If not, see <http://www.gnu.org/licenses/>. *
* *
********************************************************************************
* Description:
* It containt functions to display XPM images using Xlib. Also we can
* render text and make some drawing in colors.
* Based in Xpm.cc by Per Linden (included in Temperature.app 1.4) released
* under GNU GPL v2 (or later) license.
*
* Change History:
* Date Author Modification
*
********************************************************************************/
#include <X11/Xlib.h>
#include <X11/xpm.h>
#include <X11/extensions/shape.h>
#include <iostream>
#include <stdlib.h>
#include <string>
#include "XDraw.h"
#include "errors.h"
#include <cstring>
using namespace std;
/*************************************************************
* Constructor XDraw *
*************************************************************
* Description: *
* Load a background image into a Window shown in a *
* Display *
* *
* Input: *
* Display* disp - Current display *
* Window root - Root Window where to draw *
* const char data* - XPM Image data *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
XDraw::XDraw(Display* disp, Window root, const char* data)
{
xDisplay = disp;
defaultWin = root;
load_bkgrnd(data);
}
/*************************************************************
* Method: load_bkgrnd() *
*************************************************************
* Description: *
* Load Xpm data as a background image. *
* *
* Input: *
* const char* data - XPM image data *
* *
* Output: *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::load_bkgrnd(const char* data)
{
int error;
Attributes.valuemask = 0;
error = XpmCreatePixmapFromBuffer(xDisplay, defaultWin, (char *) data, &Image, &Mask, &Attributes);
if (error!=XpmSuccess)
error_handler(ERR_XPMERROR,NULL);
}
/*************************************************************
* Destructor ~XDraw *
*************************************************************
* Description: *
* Frees memory *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
XDraw::~XDraw()
{
xpmfree();
}
/*************************************************************
* Method xpmfree() *
*************************************************************
* Description: *
* Frees Memory *
* *
* Input: *
* Nothing *
* *
* Output: *
* Nothing *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::xpmfree()
{
if (Image) {
XFreePixmap(xDisplay, Image);
}
if (Mask) {
XFreePixmap(xDisplay, Mask);
}
}
/*************************************************************
* Method: replace_background() *
*************************************************************
* Description: *
* Replaces background image data in the current window *
* *
* Input: *
* const char* bkg_data - New XPM image to replace actual *
* background data *
* *
* Output: *
* Nothing *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::replace_background(const char* bkg_data)
{
xpmfree(); // Free image and mask
load_bkgrnd(bkg_data);
}
/*************************************************************
* Function: setWindowPixmap(), setWindowPixmapShaped(), *
* setwpxmap() *
*************************************************************
* Description: *
* Renders the image into the Window *
* We can do this with the default window, or with *
* another one. *
* *
* Input: *
* Window win - Window to render the image *
* bool shaped - Wether we have to apply mask or not. *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::setWindowPixmap(Window win)
{
setwpxmap(win, false);
}
void XDraw::setWindowPixmap()
{
setwpxmap(defaultWin, false);
}
void XDraw::setwpxmap(Window win, bool shaped) // SetWindowPixmap
{
XResizeWindow(xDisplay, win, Attributes.width, Attributes.height);
XSetWindowBackgroundPixmap(xDisplay, win, Image);
if (shaped)
XShapeCombineMask(xDisplay, win, ShapeBounding, 0, 0, Mask, ShapeSet);
XClearWindow(xDisplay, win);
}
void XDraw::setWindowPixmapShaped(Window win)
{
setwpxmap(win, true);
}
void XDraw::setWindowPixmapShaped()
{
setwpxmap(defaultWin, true);
}
/*************************************************************
* Function: setDefaultWindow *
*************************************************************
* Description: *
* Replaces default window with another one. *
* *
* Input: *
* Window win - The new default window to work with. *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::setDefaultWindow(Window win)
{
defaultWin = win;
}
/*************************************************************
* Function: Sync, doxsync *
*************************************************************
* Description: *
* XSync the Window *
* *
* Input: *
* Window win - The Window *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::Sync(Window win)
{
doxsync(win);
}
void XDraw::Sync()
{
doxsync(defaultWin);
}
void XDraw::doxsync(Window win)
{
XClearWindow(xDisplay, win);
XSync(xDisplay, win);
}
/*************************************************************
* Method: DrawRect *
*************************************************************
* Description: *
* Draws a filled rectangle *
* *
* Input: *
* int x, int y - X, Y positions *
* unsigned int w, unsigned int h - Width and Height *
* XDrawColor color - Color of the filled rectangle *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::DrawRect(int x, int y, unsigned int w, unsigned int h, XDrawColor color)
{
GC gc;
XGCValues gcv;
gcv.foreground=setColor(color);
gc = XCreateGC(xDisplay, Image, GCForeground, &gcv);
XFillRectangle(xDisplay, Image, gc, x,y,w,h);
}
/*************************************************************
* Function: setColor *
*************************************************************
* Description: *
* Gets unsigned long value, from rgb data. It can be *
* extracted from individual ints or from a XDrawColor *
* structure *
* *
* Input: *
* int red, int gree, int blue (rgb data) *
* or XDrawColor color (rgb data within a XDrawColor *
* structure) *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
unsigned long XDraw::setColor(XDrawColor color)
{
unsigned long ret_color;
int r, g, b;
r = (int)((256-color.r) * 255) & 0xff;
g = (int)((256-color.g) * 255) & 0xff;
b = (int)((256-color.b) * 255) & 0xff;
ret_color = (r<<16)+(g<<8)+b;
return ret_color;
}
unsigned long XDraw::setColor(int red, int green, int blue)
{
unsigned long ret_color;
int r, g, b;
r = (int)((256-red) * 255) & 0xff;
g = (int)((256-green) * 255) & 0xff;
b = (int)((256-blue) * 255) & 0xff;
ret_color = (r<<16)+(g<<8)+b;
return ret_color;
}
/*************************************************************
* Function: drawString *
*************************************************************
* Description: *
* Renders text into the Image *
* *
* Input: *
* int x, int y - X, Y position of the text *
* (if x==CENTER_TEXT) it will be centered. *
* int maxX - max. width in pixels of the text *
* XDrawColor color - Color to render the text *
* char* font - Font to use *
* char* str - Text to render *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
void XDraw::drawString(int x, int y, int maxX, XDrawColor color, char* font, char* str)
{
XFontStruct* fontStruct;
GC gc;
XGCValues gcv;
if ((fontStruct = XLoadQueryFont(xDisplay, font)) == 0)
error_handler(ERR_BADFONT, font);
gcv.foreground=setColor(color);
gc = XCreateGC(xDisplay, Image, GCForeground, &gcv);
int strLength = strlen(str);
int strWidth = XTextWidth(fontStruct, str, strLength);
if (strWidth>maxX)
{
maxX=maxX-XTextWidth(fontStruct, (char*)"...", 3);
strLength--;
while (strWidth>maxX)
{
strLength--;
strWidth = XTextWidth(fontStruct, str, strLength);
}
str[strLength]='\0'; // Cut string
strcat(str,"..."); // Add ... at the end
strLength=strLength+3;
}
if (x==CENTER_TEXT)
x = (Attributes.width / 2) - (strWidth / 2);
XSetFont(xDisplay, gc, fontStruct->fid);
XDrawString(xDisplay, Image, gc, x, y, str, strLength);
XFreeGC(xDisplay, gc);
XFreeFont(xDisplay, fontStruct);
}
/*************************************************************
* Function: setDrawColor() *
*************************************************************
* Description: *
* Inserts individual rgb data into a XDrawColor *
* structure. *
* *
* Input: *
* int r, int g, int b - RGB data *
* *
* Output: *
* XDrawColor structure containing rgb data *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
XDraw::XDrawColor setDrawColor(int r, int g, int b)
{
XDraw::XDrawColor color;
color.r=r;
color.b=b;
color.g=g;
return color;
}
/*************************************************************
* Function: testfont *
*************************************************************
* Description: *
* Can we use this font? *
* Tests if it is installed on the system and it is *
* usable. *
* *
* Input: *
* char* font - Font to test *
* Display* disp - Display to use *
* *
* Output: *
* True if we can use it, false if we can't *
* *
* Change History: *
* Date Author Modification *
* *
*************************************************************/
bool testfont(const char *font, Display *disp)
{
XFontStruct* fontstruct;
return ((fontstruct = XLoadQueryFont(disp, font)) != 0);
}
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