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magic/windows/windView.c

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/* windView.c -
*
* Routines in this file control what is viewed in the contents
* of the windows. This includes things like pan, zoom, and loading
* of windows.
*
* *********************************************************************
* * Copyright (C) 1985, 1990 Regents of the University of California. *
* * Permission to use, copy, modify, and distribute this *
* * software and its documentation for any purpose and without *
* * fee is hereby granted, provided that the above copyright *
* * notice appear in all copies. The University of California *
* * makes no representations about the suitability of this *
* * software for any purpose. It is provided "as is" without *
* * express or implied warranty. Export of this software outside *
* * of the United States of America may require an export license. *
* *********************************************************************
*/
#ifndef lint
static char rcsid[] __attribute__ ((unused)) = "$Header$";
#endif /* not lint */
#include <stdio.h>
#include "utils/magic.h"
#include "utils/geometry.h"
#include "windows/windows.h"
#include "graphics/glyphs.h"
#include "graphics/graphics.h"
#include "windows/windInt.h"
#include "textio/textio.h"
extern void windNewView();
/*
* ----------------------------------------------------------------------------
*
* windFixSurfaceArea --
*
* When a window's surface or screen area has been changed,
* this procedure is usually called to fix up w->w_surfaceArea and
* w_origin. Before calling this procedure, w->w_origin gives the
* screen location of w_surfaceArea.r_ll in SUBPIXEL of a pixel and
* w->w_scale is correct, but w->w_surfaceArea may no longer be a
* slight overlap of w->w_screenArea as it should be. This procedure
* regenerates w->w_surfaceArea to correspond to w->w_screenArea and
* changes w->w_origin to correspond to w->w_surfaceArea.r_ll again.
*
* Results:
* None.
*
* Side effects:
* w->w_origin and w->w_surfaceArea are modified.
*
* ----------------------------------------------------------------------------
*/
void
windFixSurfaceArea(w)
MagWindow *w; /* Window to fix up. */
{
Rect newArea, tmp;
GEO_EXPAND(&w->w_screenArea, 1, &tmp);
WindScreenToSurface(w, &tmp, &newArea);
w->w_origin.p_x += (newArea.r_xbot - w->w_surfaceArea.r_xbot) * w->w_scale;
w->w_origin.p_y += (newArea.r_ybot - w->w_surfaceArea.r_ybot) * w->w_scale;
w->w_surfaceArea = newArea;
}
/*
* ----------------------------------------------------------------------------
*
* WindUnload --
*
* Remove a client with the indicated surfaceID and reset the window
* to default cell (UNKNOWN).
*
* Results:
* None.
*
* Side effects:
* None.
* ----------------------------------------------------------------------------
*/
void
WindUnload(surfaceID)
ClientData surfaceID; /* A unique ID for this surface */
{
MagWindow *mw;
for (mw = windTopWindow; mw != NULL; mw = mw->w_nextWindow)
if (mw->w_surfaceID == surfaceID)
DBWloadWindow(mw, (char *)NULL, TRUE, FALSE, FALSE);
}
/*
* ----------------------------------------------------------------------------
* WindLoad --
*
* Load a new client surface into a window. An initial surface area
* must be specified -- this is the area that will be visible in
* the window initially.
*
* Results:
* True if everything went well, false if the client does not
* own the window.
*
* Side effects:
* None.
* ----------------------------------------------------------------------------
*/
bool
WindLoad(w, client, surfaceID, surfaceArea)
MagWindow *w;
WindClient client; /* The unique identifier of the client */
ClientData surfaceID; /* A unique ID for this surface */
Rect *surfaceArea; /* The area that should appear in the window */
{
if (client != w->w_client) return FALSE;
w->w_surfaceID = surfaceID;
WindMove(w, surfaceArea);
return TRUE;
}
/*
* ----------------------------------------------------------------------------
* WindMove --
*
* Move the surface under the window so that the given area is visible
* and as large as possible.
*
* Results:
* None.
*
* Side effects:
* The window will be now view a different portion of the clients area.
* The client may be called to redisplay the areas that moved.
* ----------------------------------------------------------------------------
*/
void
WindMove(w, surfaceArea)
MagWindow *w; /* the window to be panned */
Rect *surfaceArea; /* The area to be viewed */
{
int size, xscale, yscale;
int halfSizePixels, halfSizeUnits;
/* Compute the scale factor from world coordinates to 1/SUBPIXEL
* of a pixel. To be sure that surfaceArea will all fit in the
* window, compute the scale twice, once using the y-dimension
* alone, and once using x alone. Then use the smaller scale factor.
*/
size = (surfaceArea->r_xtop - surfaceArea->r_xbot + 1);
xscale = ((dlong)(w->w_screenArea.r_xtop -
w->w_screenArea.r_xbot + 1) * SUBPIXEL) / size;
size = (surfaceArea->r_ytop - surfaceArea->r_ybot + 1);
yscale = ((w->w_screenArea.r_ytop -
w->w_screenArea.r_ybot + 1) * SUBPIXEL) / size;
w->w_scale = MIN(xscale, yscale);
if (w->w_scale < 1)
{
/* If this message appears, then it is likely that the */
/* definition for SUBPIXELBITS should be increased. */
TxError("Warning: At minimum scale!\n");
w->w_scale = 1;
}
/* Recompute w->surfaceArea and w->w_origin, which determine the
* screen-surface mapping along with w->w_scale. In order to
* center surfaceArea in the window, compute the windows's half-size
* in units of SUBPIXEL of a pixel and in units. Be sure to round
* things up so that w->w_surfaceArea actually overlaps the window
* slightly.
*/
halfSizePixels = (w->w_screenArea.r_xtop - w->w_screenArea.r_xbot) * HSUBPIXEL;
halfSizeUnits = (halfSizePixels / w->w_scale) + 1;
w->w_surfaceArea.r_xbot = (surfaceArea->r_xbot + surfaceArea->r_xtop) / 2
- halfSizeUnits;
w->w_surfaceArea.r_xtop = w->w_surfaceArea.r_xbot + 2 * halfSizeUnits + 1;
w->w_origin.p_x =
((w->w_screenArea.r_xtop + w->w_screenArea.r_xbot) * HSUBPIXEL) -
(halfSizeUnits * w->w_scale);
halfSizePixels = (w->w_screenArea.r_ytop - w->w_screenArea.r_ybot) * HSUBPIXEL;
halfSizeUnits = (halfSizePixels/w->w_scale) + 1;
w->w_surfaceArea.r_ybot = (surfaceArea->r_ybot + surfaceArea->r_ytop) / 2
- halfSizeUnits;
w->w_surfaceArea.r_ytop = w->w_surfaceArea.r_ybot + 2 * halfSizeUnits + 1;
w->w_origin.p_y =
((w->w_screenArea.r_ytop + w->w_screenArea.r_ybot) * HSUBPIXEL) -
(halfSizeUnits * w->w_scale);
WindAreaChanged(w, &(w->w_screenArea));
windNewView(w);
}
/*
* ----------------------------------------------------------------------------
* WindZoom --
*
* Zoom a window. The window will stay centered about the same point
* as it is currently. A factor greater than 1 increases the scale
* of the window (higher magnification), while a factor smaller than 1
* results in a lower scale (lower magnification).
*
* Results:
* None.
*
* Side effects:
* The window will be now view a different portion of the client's area.
* The client may be called to redisplay part of the screen.
* ----------------------------------------------------------------------------
*/
void
WindZoom(w, factor)
MagWindow *w; /* the window to be zoomed */
float factor; /* The amount to zoom by (1 is no change),
* greater than 1 is a larger magnification
* (zoom in), and less than 1 is less mag.
* (zoom out) )
*/
{
int centerx, centery;
Rect newArea;
centerx = (w->w_surfaceArea.r_xbot + w->w_surfaceArea.r_xtop) / 2;
centery = (w->w_surfaceArea.r_ybot + w->w_surfaceArea.r_ytop) / 2;
newArea.r_xbot = centerx - (centerx - w->w_surfaceArea.r_xbot) * factor;
newArea.r_xtop = centerx + (w->w_surfaceArea.r_xtop - centerx) * factor;
newArea.r_ybot = centery - (centery - w->w_surfaceArea.r_ybot) * factor;
newArea.r_ytop = centery + (w->w_surfaceArea.r_ytop - centery) * factor;
WindMove(w, &newArea);
}
/*
* ----------------------------------------------------------------------------
*
* WindScale --
*
* Zoom all viewing windows by the given factor. Because this is done
* in conjunction with rescaling the geometry, we don't preserve the
* center position like WindZoom() does. The net effect is that the
* image in the window doesn't appear to change.
*
* Results:
* None.
*
* Side effects:
* All windows will be now view a different portion of the client's area.
*
* ----------------------------------------------------------------------------
*/
void
WindScale(scalen, scaled)
int scalen, scaled;
{
extern void DBScalePoint();
MagWindow *w2;
Rect newArea;
for (w2 = windTopWindow; w2 != NULL; w2 = w2->w_nextWindow)
{
newArea.r_xbot = w2->w_surfaceArea.r_xbot;
newArea.r_xtop = w2->w_surfaceArea.r_xtop;
newArea.r_ybot = w2->w_surfaceArea.r_ybot;
newArea.r_ytop = w2->w_surfaceArea.r_ytop;
DBScalePoint(&newArea.r_ll, scalen, scaled);
DBScalePoint(&newArea.r_ur, scalen, scaled);
WindMove(w2, &newArea);
}
}
/*
* ----------------------------------------------------------------------------
*
* WindTranslate --
*
* Move the viewing windows by the given delta position. Because
* this is done in conjunction with repositioning the geometry
* ("move origin" command), we don't preserve the center position
* like WindZoom() does. The net effect is that the image in the
* window doesn't appear to change.
*
* Results:
* None.
*
* Side effects:
* All windows will be now view a different portion of the client's area.
*
* ----------------------------------------------------------------------------
*/
void
WindTranslate(origx, origy)
int origx, origy;
{
extern void DBMovePoint();
MagWindow *w2;
Rect newArea;
for (w2 = windTopWindow; w2 != NULL; w2 = w2->w_nextWindow)
{
newArea.r_xbot = w2->w_surfaceArea.r_xbot;
newArea.r_xtop = w2->w_surfaceArea.r_xtop;
newArea.r_ybot = w2->w_surfaceArea.r_ybot;
newArea.r_ytop = w2->w_surfaceArea.r_ytop;
DBMovePoint(&newArea.r_ll, origx, origy);
DBMovePoint(&newArea.r_ur, origx, origy);
WindMove(w2, &newArea);
}
}
/*
* ----------------------------------------------------------------------------
*
* WindView --
*
* Change the view in the selected window to just contain the
* bounding box for that window.
*
*
* Results:
* None.
*
* Side effects:
* The window underneath the cursor is changed.
*
* ----------------------------------------------------------------------------
*/
/* ARGSUSED */
void
WindView(w)
MagWindow *w;
{
Rect bbox;
#define SLOP 10 /* Amount of border (in fraction of a screenfull)
* to add.
*/
if (w == NULL)
return;
if (w->w_bbox == NULL) {
TxError("Can't do 'view' because w_bbox is NULL.\n");
TxError("Report this to a magic implementer.\n");
return;
};
bbox = *(w->w_bbox);
bbox.r_xbot -= (bbox.r_xtop - bbox.r_xbot + 1) / SLOP;
bbox.r_xtop += (bbox.r_xtop - bbox.r_xbot + 1) / SLOP;
bbox.r_ybot -= (bbox.r_ytop - bbox.r_ybot + 1) / SLOP;
bbox.r_ytop += (bbox.r_ytop - bbox.r_ybot + 1) / SLOP;
WindMove(w, &bbox);
}
/*
* ----------------------------------------------------------------------------
*
* WindScroll --
*
* Scroll the view around.
*
* Results:
* None.
*
* Side effects:
* The window underneath the cursor is changed. The offset can
* be specified either in screen coordinates or surface coordinates
* or both.
*
* ----------------------------------------------------------------------------
*/
void
WindScroll(w, surfaceOffset, screenOffset)
MagWindow *w;
Point *surfaceOffset; /* An offset in surface coordinates. The
* screen point that used to display surface
* point (0,0) will now display surface point
* surfaceOffset. Can be NULL to indicate
* no offset.
*/
Point *screenOffset; /* An additional offset in screen coordinates.
* Can be NULL to indicate no offset. If
* non-NULL, then after scrolling according
* to surfaceOffset, the view is adjusted again
* so that the surface unit that used to be
* displayed at (0,0) will now be displayed
* at screenOffset. Be careful to make sure
* the coordinates in here are relatively
* small (e.g. the same order as the screen
* size), or else there may be arithmetic
* overflow and unexpected results. Use only
* surfaceOffset if you're going to be
* scrolling a long distance.
*/
{
Rect screenorigin;
bool useBackingStore = FALSE;
Point moveorigin;
Rect refresh, norefresh;
WindSurfaceToScreenNoClip(w, &GeoNullRect, &screenorigin);
if (surfaceOffset != NULL)
{
w->w_surfaceArea.r_xbot += surfaceOffset->p_x;
w->w_surfaceArea.r_ybot += surfaceOffset->p_y;
w->w_surfaceArea.r_xtop += surfaceOffset->p_x;
w->w_surfaceArea.r_ytop += surfaceOffset->p_y;
}
/* Screen offsets are trickier. Divide up into a whole-unit part
* (which is applied to w->w_surfaceArea) and a fractional-unit
* part (which is applied to w->w_origin. Then readjust both to
* make sure that w->w_surfaceArea still overlaps the window area
* on all sides.
*/
if (screenOffset != NULL)
{
int units, pixels;
pixels = screenOffset->p_x * SUBPIXEL;
units = pixels/w->w_scale;
w->w_surfaceArea.r_xbot -= units;
w->w_surfaceArea.r_xtop -= units;
w->w_origin.p_x += pixels - (w->w_scale*units);
pixels = screenOffset->p_y * SUBPIXEL;
units = pixels/w->w_scale;
w->w_surfaceArea.r_ybot -= units;
w->w_surfaceArea.r_ytop -= units;
w->w_origin.p_y += pixels - (w->w_scale*units);
}
/* For now, we forget about using backing store in the case */
/* of diagonal scrolls. Ideally, we would want to register */
/* two rectangles for the window redraw in this case. */
if (w->w_backingStore != (ClientData)NULL)
{
if (surfaceOffset)
if (surfaceOffset->p_x == 0 || surfaceOffset->p_y == 0)
useBackingStore = TRUE;
if (screenOffset)
if (screenOffset->p_x == 0 || screenOffset->p_y == 0)
if (useBackingStore == FALSE)
useBackingStore = TRUE;
}
windFixSurfaceArea(w);
/* Finally, if we are going to use backing store, we ought */
/* to adjust the screen movement to the nearest multiple of */
/* 8 so that stipples will remain aligned. This must be */
/* done after windFixSurfaceArea(), but cannot screw up the */
/* coordinate system, so we do windFixSurfaceArea() again. */
if (useBackingStore)
{
int units, pixels;
WindSurfaceToScreenNoClip(w, &GeoNullRect, &refresh);
moveorigin.p_x = refresh.r_xbot - screenorigin.r_xbot;
moveorigin.p_y = refresh.r_ybot - screenorigin.r_ybot;
pixels = (moveorigin.p_x % 8) * SUBPIXEL;
units = pixels/w->w_scale;
w->w_surfaceArea.r_xbot += units;
w->w_surfaceArea.r_xtop += units;
w->w_origin.p_x -= (pixels - (w->w_scale*units));
pixels = (moveorigin.p_y % 8) * SUBPIXEL;
units = pixels/w->w_scale;
w->w_surfaceArea.r_ybot += units;
w->w_surfaceArea.r_ytop += units;
w->w_origin.p_y -= (pixels - (w->w_scale*units));
moveorigin.p_x -= (moveorigin.p_x % 8);
moveorigin.p_y -= (moveorigin.p_y % 8);
windFixSurfaceArea(w);
}
/* If we have backing store available, shift the contents. */
if (useBackingStore)
{
refresh = w->w_screenArea;
norefresh = w->w_screenArea;
if (moveorigin.p_x > 0)
{
refresh.r_xtop = moveorigin.p_x + w->w_screenArea.r_xbot;
norefresh.r_xbot = refresh.r_xtop;
}
else if (moveorigin.p_x < 0)
{
refresh.r_xbot = refresh.r_xtop + moveorigin.p_x;
norefresh.r_xtop += moveorigin.p_x;
}
if (moveorigin.p_y > 0)
{
refresh.r_ytop = moveorigin.p_y + w->w_screenArea.r_ybot;
norefresh.r_ybot = refresh.r_ytop;
}
else if (moveorigin.p_y < 0)
{
refresh.r_ybot = refresh.r_ytop + moveorigin.p_y;
norefresh.r_ytop += moveorigin.p_y;
}
GrLock(w, FALSE);
(*GrScrollBackingStorePtr)(w, &moveorigin);
(*GrGetBackingStorePtr)(w, &norefresh);
GrUnlock(w);
WindAreaChanged(w, &refresh);
/* Update highlights over entire screen area */
DBWHLRedrawPrepWindow(w, &(w->w_surfaceArea));
}
else
WindAreaChanged(w, &(w->w_screenArea));
windNewView(w);
}
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