Subject:
No BLACK with True Types?
From:
Olaf Winne ####@####.####
Date:
29 Jan 2002 17:00:58 -0000
Message-Id: <02012917573600.12417@o6v9n4>
Hi all,
now we are using the nano-X app... Almost everything works fine!!! Thanks to
the developers.
One problem: I'm using True Types, but I can't use the defined color BLACK
(with GrSetForeground) to write. With all other colors it works. BLACK also
works fine with the nano-X system fonts.
I use the framebuffer device (Linux 2.4.3.) 8bpp.
regards
Olaf
Am Dienstag, 29. Januar 2002 17:32 schrieb Alex Holden:
> Henry Chea wrote:
> > Maybe point me to examples, docs, or perhaps edit my source code below to
> > show how to solve the problem?
>
> One way is to use a pipe to send events to the slave.
>
> Something along these lines (completely untested):
>
> //control.c
> #include <unistd.h>
> #include <stdio.h>
> #define MWINCLUDECOLORS
> #include "microwin/nano-X.h"
>
> GR_WINDOW_ID control_wid;
> GR_GC_ID gc;
>
> int control_fd;
> int pipefds[2];
>
> void event_handler (GR_EVENT *event);
>
> int main (void)
> {
> pid_t pid;
>
> if(pipe(pipefds) < 0) {
> fprintf(stderr, "pipe() failed\n");
> exit(1);
> }
>
> if((pid = fork()) < 0) {
> fprintf(stderr, "fork() failed\n");
> exit(1);
> } else if(pid > 0) {
> close(pipefds[0]); /* parent closes the output side */
> } else {
> close(pipefds[1]); /* child closes the input side */
> /* Set stdin to the output of the pipe: */
> if(dup2(pipefds[0], STDIN_FILENO) != STDIN_FILENO) {
> fprintf(stderr, "dup2() failed\n");
> exit(1);
> }
> close(pipefds[0]);
> if(execl("/usr/local/bin/SLAVE", "SLAVE", NULL) < 0) {
> fprintf(stderr, "execl() failed\n");
> exit(1);
> }
> }
>
> if ((control_fd = GrOpen()) < 0)
> {
> fprintf (stderr, "GrOpen failed");
> exit (1);
> }
>
>
> gc = GrNewGC();
> GrSetGCUseBackground (gc, GR_FALSE);
> GrSetGCForeground (gc, BLUE);
>
> control_wid = GrNewWindowEx (GR_WM_PROPS_NOMOVE |
> GR_WM_PROPS_BORDER |
> GR_WM_PROPS_NOAUTOMOVE |
> GR_WM_PROPS_NOAUTORESIZE,
> "Control Window",
> GR_ROOT_WINDOW_ID,
> 0, 0, 150, 478, YELLOW);
>
> GrSelectEvents (control_wid, GR_EVENT_MASK_EXPOSURE |
> GR_EVENT_MASK_BUTTON_DOWN);
>
> GrMapWindow (control_wid);
> GrMainLoop (event_handler);
> }
>
> void event_handler (GR_EVENT *event)
> {
> switch (event->type)
> {
> case GR_EVENT_TYPE_EXPOSURE:
> GrText (control_wid, gc, 20, 20,
> "Click me", -1, GR_TFASCII);
> break;
>
> case GR_EVENT_TYPE_BUTTON_DOWN:
> GrClearWindow (control_wid , GR_TRUE);
> if(write(pipe_fds[1], "1", 1) != 1) {
> fprintf(stderr, "Couldn't write message to child\n");
> exit(1);
> }
> break;
> }
> }
>
> ******************************
> //SLAVE.C
> #include <stdio.h>
> #define MWINCLUDECOLORS
> #include "microwin/nano-X.h"
>
> GR_WINDOW_ID slave_wid;
> GR_GC_ID gc;
>
> void event_handler (GR_EVENT *event);
>
> int slave_fd;
>
> int main (void)
> {
> if ((slave_fd = GrOpen()) < 0)
> {
> fprintf (stderr, "GrOpen failed");
> exit (1);
> }
>
> gc = GrNewGC();
> GrSetGCUseBackground (gc, GR_FALSE);
> GrSetGCForeground (gc, RED);
>
>
> slave_wid = GrNewWindowEx (GR_WM_PROPS_APPFRAME |
> GR_WM_PROPS_CAPTION |
> GR_WM_PROPS_CLOSEBOX,
> "slave Window",
> GR_ROOT_WINDOW_ID,
> 150, 150, 200, 100, WHITE);
>
> GrRegisterInput(STDIN_FILENO);
>
>
> GrSelectEvents (slave_wid, GR_EVENT_MASK_CLOSE_REQ|
> GR_EVENT_TYPE_FDINPUT);
>
> GrMapWindow (slave_wid);
> GrMainLoop (event_handler);
> }
>
> void event_handler (GR_EVENT *event)
> {
> char in;
>
> switch (event->type)
> {
> case GR_EVENT_TYPE_CLOSE_REQ:
> GrClose();
> exit (0);
>
> case GR_EVENT_TYPE_FDINPUT:
> if(read(STDIN_FILENO, &in, 1) != 1) {
> fprintf(stderr, "couldn't read event from parent\n");
> exit(1);
> }
> if(in == '1') {
> GrText (slave_wid, gc, 50, 50,
> "Button 1 pressed", -1, GR_TFASCII);
> } else if(in == '2') {
> GrText (slave_wid, gc, 50, 50,
> "Button 2 pressed", -1, GR_TFASCII);
> } else {
> GrText (slave_wid, gc, 50, 50,
> "Unknown button pressed", -1, GR_TFASCII);
> }
> break;
> }
> }
