home *** CD-ROM | disk | FTP | other *** search
- ;/* clonescreen.c - clone an existing public screen.
- lc -b1 -cfist -v -y -j73 clonescreen
- blink FROM LIB:c.o clonescreen.o TO clonescreen 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- example may not be published in printed form or distributed with any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 <exec/memory.h>
- #include <intuition/intuition.h>
- #include <intuition/screens.h>
-
- #include <clib/exec_protos.h>
- #include <clib/dos_protos.h>
- #include <clib/graphics_protos.h>
- #include <clib/intuition_protos.h>
-
- #include <string.h>
-
- #ifdef LATTICE
- int CXBRK(void) { return(0); } /* Disable Lattice CTRL/C handling */
- int chkabort(void) { return(0); } /* really */
- #endif
-
- VOID cloneScreen( UBYTE * );
-
- struct Library *IntuitionBase;
- struct GfxBase *GfxBase;
-
- /*
- ** Open all libraries for the cloneScreen() subroutine.
- */
- VOID main(int argc, char **argv)
- {
- UBYTE *pub_screen_name = "Workbench";
-
- IntuitionBase = OpenLibrary("intuition.library",0);
- if (IntuitionBase != NULL)
- {
- /* Require version 37 of Intuition. */
- if (IntuitionBase->lib_Version >= 37)
- {
- /* Note the two methods of getting the library version
- ** that you really want.
- */
- GfxBase = (struct GfxBase *)OpenLibrary("graphics.library",37);
- if (GfxBase != NULL)
- {
- cloneScreen(pub_screen_name);
-
- CloseLibrary((struct Library *)GfxBase);
- }
- }
- CloseLibrary(IntuitionBase);
- }
- }
-
- /* Clone a public screen whose name is passed to the routine.
- ** Width, Height, Depth, Pens, Font and DisplayID attributes are
- ** all copied from the screen.
- ** Overscan is assumed to be OSCAN_TEXT, as there is no easy way to
- ** find the overscan type of an existing screen.
- ** AutoScroll is turned on, as it does not hurt. Screens that are
- ** smaller than the display clip will not scroll.
- */
-
- VOID cloneScreen(UBYTE *pub_screen_name)
- {
- struct Screen *my_screen;
- ULONG screen_modeID;
- UBYTE *pub_scr_font_name;
- UBYTE *font_name;
- ULONG font_name_size;
- struct TextAttr pub_screen_font;
- struct TextFont *opened_font;
-
- struct Screen *pub_screen = NULL;
- struct DrawInfo *screen_drawinfo = NULL;
-
- /* name is a (UBYTE *) pointer to the name of the public screen to clone */
- pub_screen = LockPubScreen(pub_screen_name);
- if (pub_screen != NULL)
- {
- /* Get the DrawInfo structure from the locked screen
- ** This returns pen, depth and font info.
- */
- screen_drawinfo = GetScreenDrawInfo(pub_screen);
- if (screen_drawinfo != NULL)
- {
- screen_modeID = GetVPModeID(&(pub_screen->ViewPort));
- if( screen_modeID != INVALID_ID )
- {
- /* Get a copy of the font
- ** The name of the font must be copied as the public screen may
- ** go away at any time after we unlock it.
- ** Allocate enough memory to copy the font name, create a
- ** TextAttr that matches the font, and open the font.
- */
- pub_scr_font_name = screen_drawinfo->dri_Font->tf_Message.mn_Node.ln_Name;
- font_name_size = 1 + strlen(pub_scr_font_name);
- font_name = AllocMem(font_name_size, MEMF_CLEAR);
- if (font_name != NULL)
- {
- strcpy(font_name, pub_scr_font_name);
- pub_screen_font.ta_Name = font_name;
- pub_screen_font.ta_YSize = screen_drawinfo->dri_Font->tf_YSize;
- pub_screen_font.ta_Style = screen_drawinfo->dri_Font->tf_Style;
- pub_screen_font.ta_Flags = screen_drawinfo->dri_Font->tf_Flags;
-
- opened_font = OpenFont(&pub_screen_font);
- if (opened_font != NULL)
- {
- /* screen_modeID may now be used in a call to
- ** OpenScreenTagList() with the tag SA_DisplayID.
- */
- my_screen = OpenScreenTags(NULL,
- SA_Width, pub_screen->Width,
- SA_Height, pub_screen->Height,
- SA_Depth, screen_drawinfo->dri_Depth,
- SA_Overscan, OSCAN_TEXT,
- SA_AutoScroll, TRUE,
- SA_Pens, (ULONG)(screen_drawinfo->dri_Pens),
- SA_Font, (ULONG)&pub_screen_font,
- SA_DisplayID, screen_modeID,
- SA_Title, "Cloned Screen",
- TAG_END);
- if (my_screen != NULL)
- {
- /* Free the drawinfo and public screen as we don't
- ** need them any more. We now have our own screen.
- */
- FreeScreenDrawInfo(pub_screen,screen_drawinfo);
- screen_drawinfo = NULL;
- UnlockPubScreen(pub_screen_name,pub_screen);
- pub_screen = NULL;
-
- Delay(300); /* should be rest_of_program */
-
- CloseScreen(my_screen);
- }
- CloseFont(opened_font);
- }
- FreeMem(font_name, font_name_size);
- }
- }
- }
- }
-
- /* 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(pub_screen_name,pub_screen);
- }
-