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- ;/* publicscreen.c - open a screen with the pens from a public screen.
- lc -b1 -cfist -v -y -j73 publicscreen
- blink FROM LIB:c.o publicscreen.o TO publicscreen LIB LIB:lc.lib LIB:amiga.lib
- quit
- */
-
- /*
- Copyright (c) 1992 Commodore-Amiga, Inc.
-
- This example is provided in electronic form by Commodore-Amiga, Inc. for
- use with the "Amiga ROM Kernel Reference Manual: Libraries", 3rd Edition,
- published by Addison-Wesley (ISBN 0-201-56774-1).
-
- The "Amiga ROM Kernel Reference Manual: Libraries" contains additional
- information on the correct usage of the techniques and operating system
- functions presented in these examples. The source and executable code
- of these examples may only be distributed in free electronic form, via
- bulletin board or as part of a fully non-commercial and freely
- redistributable diskette. Both the source and executable code (including
- comments) must be included, without modification, in any copy. This
- example may not be published in printed form or distributed with any
- commercial product. However, the programming techniques and support
- routines set forth in these examples may be used in the development
- of original executable software products for Commodore Amiga computers.
-
- All other rights reserved.
-
- This example is provided "as-is" and is subject to change; no
- warranties are made. All use is at your own risk. No liability or
- responsibility is assumed.
- */
-
- #define INTUI_V36_NAMES_ONLY
-
- #include <exec/types.h>
- #include <intuition/intuition.h>
- #include <intuition/screens.h>
-
- #include <clib/exec_protos.h>
- #include <clib/dos_protos.h>
- #include <clib/intuition_protos.h>
-
- #ifdef LATTICE
- int CXBRK(void) { return(0); } /* Disable Lattice CTRL/C handling */
- int chkabort(void) { return(0); } /* really */
- #endif
-
- VOID usePubScreenPens(void);
-
- struct Library *IntuitionBase;
-
- /* main(): open libraries, clean up when done.
- */
- VOID main(int argc, char **argv)
- {
- IntuitionBase = OpenLibrary("intuition.library",0);
- if ( IntuitionBase != NULL )
- {
- /* Check the version number; Release 2 is */
- /* required for public screen functions */
- if (IntuitionBase->lib_Version >= 37)
- {
- usePubScreenPens();
- }
- CloseLibrary(IntuitionBase);
- }
- }
-
- /* Open a screen that uses the pens of an existing public screen
- ** (the Workbench screen in this case).
- */
- VOID usePubScreenPens(void)
- {
- struct Screen *my_screen;
- struct TagItem screen_tags[2];
- UBYTE *pubScreenName = "Workbench";
-
- struct Screen *pub_screen = NULL;
- struct DrawInfo *screen_drawinfo = NULL;
-
- /* Get a lock on the Workbench screen */
- pub_screen = LockPubScreen(pubScreenName);
- if ( pub_screen != NULL )
- {
- /* get the DrawInfo structure from the locked screen */
- screen_drawinfo = GetScreenDrawInfo(pub_screen);
- if ( screen_drawinfo != NULL)
- {
- /* the pens are copied in the OpenScreenTagList() call,
- ** so we can simply use a pointer to the pens in the tag list.
- **
- ** This works better if the depth and colors of the new screen
- ** matches that of the public screen. Here we are forcing the
- ** workbench screen pens on a monochrome screen (which may not
- ** be a good idea). You could add the tag:
- ** (SA_Depth, screen_drawinfo->dri_Depth)
- */
- screen_tags[0].ti_Tag = SA_Pens;
- screen_tags[0].ti_Data = (ULONG)(screen_drawinfo->dri_Pens);
- screen_tags[0].ti_Tag = TAG_END;
- screen_tags[0].ti_Data = NULL;
-
- my_screen = OpenScreenTagList(NULL, screen_tags);
- if (my_screen != NULL)
- {
- /* We no longer need to hold the lock on the public screen
- ** or a copy of its DrawInfo structure as we now have our
- ** own screen. Release the screen.
- */
- FreeScreenDrawInfo(pub_screen,screen_drawinfo);
- screen_drawinfo = NULL;
- UnlockPubScreen(pubScreenName,pub_screen);
- pub_screen = NULL;
-
- Delay(90); /* should be rest_of_program */
-
- CloseScreen(my_screen);
- }
- }
- }
-
- /* These are freed in the main loop if OpenScreenTagList() does
- ** not fail. If something goes wrong, free them here.
- */
- if ( screen_drawinfo != NULL )
- FreeScreenDrawInfo(pub_screen,screen_drawinfo);
- if ( pub_screen!= NULL )
- UnlockPubScreen(pubScreenName,pub_screen);
- }
-