Hi,
I have attached an example which displays text and background rectangle When
this piece of code is run with Intel as default XORG driver everything works
fine both text and rectangle are being displayed,whereas when i switch to the
Modesetting driver only the background rectangle is seen and text is not being
displayed.
I tried running XShmqueryversion with modesetting driver , it returned value of
pixmap as True, so it means shared pixmaps should be supported.I have verified
this behavior on Ubuntu 16.04.
Kindly let me know if this is the expected behavior of modesetting driver, if
not then how to go ahead with resolving this.
Thanks,
Shubham Jha
#include <stdlib.h>
#include <iostream>
#include<unistd.h>
#include <sstream>
#include <string>
#include <X11/Xlib.h>
#include <X11/Xutil.h>
#include <X11/Xft/Xft.h>
#include <X11/extensions/XShm.h>
#include <sys/ipc.h>
#include <sys/shm.h>
using namespace std;
int main()
{
Display *display = XOpenDisplay(NULL);
Screen *scn = DefaultScreenOfDisplay(display);
int screen_num = DefaultScreen(display);
int screen_width = DisplayWidth(display, screen_num);
int screen_height = DisplayHeight(display, screen_num);
int defaultScnDepth = DefaultDepthOfScreen(scn);
Visual *visual = DefaultVisualOfScreen(scn);
Window
window=XCreateSimpleWindow(display,RootWindow(display,screen_num), 50, 50, 400,
400, 2 ,BlackPixel(display,screen_num),WhitePixel(display,screen_num));
//XFlush(display)
XMapWindow(display, window);
XShmSegmentInfo shmInfo;
XImage *xImage;
Pixmap backPixmap;
(xImage) = XShmCreateImage(display, visual, defaultScnDepth, ZPixmap,
NULL, &shmInfo, screen_width, screen_height);
shmInfo.shmid = shmget(IPC_PRIVATE, (xImage)->bytes_per_line *
(xImage)->height, IPC_CREAT | 0777);
shmInfo.shmaddr = (char *) shmat(shmInfo.shmid, 0, 0);
xImage->data = shmInfo.shmaddr;
shmInfo.readOnly = False;
XShmAttach(display, &shmInfo);
(backPixmap) = XShmCreatePixmap(display, window, (char *)
(shmInfo.shmaddr), &shmInfo, (xImage)->width, (xImage)->height,
(xImage)->depth);
XGCValues values;
GC gc = XCreateGC(display, backPixmap, 0, &values);
XSync(display, false);
Drawable drawable =backPixmap;
visual = DefaultVisual(display, DefaultScreen(display));
Colormap colormap = XCreateColormap(display, window, visual, AllocNone);
//gc = XCreateGC(display, drawable, 0, &values);
//XFlushGC(display, gc);
const char *text = "Hello";
XftDraw *xftDraw = NULL;
XRenderColor xrFGColor, xrBGColor;
XftColor xftFGColor, xftBGColor;
XftFont *font = NULL;
font = XftFontOpenName( display, DefaultScreen( display ),
"morpheus-18" );
xftDraw = XftDrawCreate(display, drawable, visual, colormap);
int nextLineStartY, rectYRef;
bool firstIte;
unsigned int rectX, rectY, rectWidth, rectHeight;
nextLineStartY = 0; rectYRef = 0;
firstIte = true;
rectX = 0; rectY = 0; rectWidth = 0; rectHeight = 0;
std::istringstream strStream(text);
std::string line;
while(std::getline(strStream, line))
{
const char *lineText = line.c_str();
if(*lineText == '\0')
{
nextLineStartY += rectHeight + 1;
continue;
}
const char *text = lineText;
XGlyphInfo extents;
XftTextExtents8(display, font, (XftChar8 *)text, strlen(text),
&extents);
unsigned int width = extents.width;
unsigned int height = extents.height;
int ascent = extents.y;
int lBearing = extents.x;
rectX = 50 - lBearing - 1;
rectY = 50 - ascent - 1;
rectWidth = width + 2 * 1;
rectHeight = height + 5 + 1;
if(firstIte)
{
rectYRef = rectY;
firstIte = false;
}
int diff = rectYRef - rectY;
rectY += nextLineStartY + diff;
nextLineStartY += rectHeight + 1;
if(1)
{
xrBGColor.red = 0x7fff;
xrBGColor.green= 0x7fff;
xrBGColor.blue = 0x7fff;
xrBGColor.alpha= 0xffff;
XftColorAllocValue(display, visual, colormap,
&xrBGColor, &xftBGColor);
// Draw background fill rectangle
XftDrawRect(xftDraw, &xftBGColor, rectX, rectY,
rectWidth, rectHeight);
XftColorFree(display, visual, colormap, &xftBGColor);
}
xrFGColor.red = 0xbfff;
xrFGColor.green = 0xbfff;
xrFGColor.blue = 0xbfff;
xrFGColor.alpha= 0xffff;
XftColorAllocValue(display, visual, colormap, &xrFGColor,
&xftFGColor);
// Overlay Text
XftDrawString8(xftDraw, &xftFGColor, font, 50, 50, (XftChar8 *)
text, strlen(text));
XColor xForeColor;
xForeColor.red = 0xafff;
xForeColor.green = 0xafff;
xForeColor.blue = 0xffff;
if(XAllocColor(display,colormap,&xForeColor))
XSetForeground(display,gc,xForeColor.pixel);
XftColorFree(display, visual, colormap, &xftFGColor);
XFreeColors(display, colormap, &(xForeColor.pixel), 1, 0);
}
XftDrawDestroy(xftDraw);
XShmPutImage(display, window, gc, xImage, 0, 0, 0, 0, 400, 400, false);
XSync(display, false);
getchar();
}
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