/* $XConsortium: Scale.c,v 1.19 94/11/30 16:36:25 kaleb Exp kaleb $ */
/*

Copyright (c) 1989  X Consortium

Permission is hereby granted, free of charge, to any person obtaining
a copy of this software and associated documentation files (the
"Software"), to deal in the Software without restriction, including
without limitation the rights to use, copy, modify, merge, publish,
distribute, sublicense, and/or sell copies of the Software, and to
permit persons to whom the Software is furnished to do so, subject to
the following conditions:

The above copyright notice and this permission notice shall be included
in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
IN NO EVENT SHALL THE X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR
OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
OTHER DEALINGS IN THE SOFTWARE.

Except as contained in this notice, the name of the X Consortium shall
not be used in advertising or otherwise to promote the sale, use or
other dealings in this Software without prior written authorization
from the X Consortium.

*/

/*
 * Author:  Davor Matic, MIT X Consortium
 */

#include <X11/IntrinsicP.h>
#include <X11/StringDefs.h>
#include <X11/Xos.h>
#include <X11/Xaw/XawInit.h>

#include "ScaleP.h"

#include <stdio.h>
#include <ctype.h>
#include <math.h>

#define myrint(x) floor(x + 0.5)

#ifndef X_NOT_STDC_ENV
#include <stdlib.h>
#endif

#if defined(ISC) && __STDC__ && !defined(ISC30)
extern double atof(char *);
#endif

#define streq(a,b) (strcmp( (a), (b) ) == 0)
#define min(x, y) (x > y ? y : x)
#define max(x, y) (x < y ? y : x)

#define DefaultBufferSize 1024
#define DefaultScaleFactor NULL

#define Offset(field) XtOffsetOf(ScaleRec, scale.field)

static XtResource resources[] = {
{XtNforeground, XtCForeground, XtRPixel, sizeof(Pixel),
     Offset(foreground_pixel), XtRString, (XtPointer) XtDefaultForeground},
{XtNgravity, XtCGravity, XtRGravity, sizeof(XtGravity),
     Offset(gravity), XtRImmediate, (XtPointer) "ForgetGravity"},
{XtNinternalWidth, XtCWidth, XtRDimension,  sizeof(Dimension),
     Offset(internal_width), XtRImmediate, (XtPointer) 2},
{XtNinternalHeight, XtCHeight, XtRDimension, sizeof(Dimension),
     Offset(internal_height), XtRImmediate, (XtPointer) 2},
{XtNresize, XtCResize, XtRBoolean, sizeof(Boolean),
     Offset(resize), XtRImmediate, (XtPointer) True},
{XtNautoscale, XtCAutoscale, XtRBoolean, sizeof(Boolean),
     Offset(autoscale), XtRImmediate, (XtPointer) True},
{XtNproportional, XtCProportional, XtRBoolean, sizeof(Boolean),
     Offset(proportional), XtRImmediate, (XtPointer) True},
{XtNscaleX, XtCScaleFactor, XtRString, sizeof(String),
     Offset(scale_x_str), XtRImmediate, (XtPointer) DefaultScaleFactor},
{XtNscaleY, XtCScaleFactor, XtRString, sizeof(String),
     Offset(scale_y_str), XtRImmediate, (XtPointer) DefaultScaleFactor},
{XtNaspectRatio, XtCAspectRatio, XtRString, sizeof(String),
     Offset(aspect_ratio_str), XtRImmediate, (XtPointer) "1.0"},
{XtNprecision, XtCPrecision, XtRString, sizeof(String),
     Offset(precision_str), XtRImmediate, (XtPointer) "0.001"},
{XtNimage, XtCImage, XtRImage, sizeof(XImage*),
     Offset(image), XtRImmediate, (XtPointer) NULL},
{XtNpasteBuffer, XtCPasteBuffer, XtRBoolean, sizeof(Boolean),
     Offset(paste_buffer), XtRImmediate, (XtPointer) False},
{XtNbufferSize, XtCBufferSize, XtRCardinal, sizeof(Cardinal),
     Offset(buffer_size), XtRImmediate, (XtPointer) DefaultBufferSize},
{XtNuserData, XtCuserData, XtRuserData, sizeof(XtPointer),
     Offset(userData), XtRImmediate, (XtPointer) NULL},
{ XtNvisual, XtCvisual, XtRVisual, sizeof(Visual*),
     Offset(visual), XtRImmediate, CopyFromParent}
};

#undef Offset

static void ClassInitialize();
static void Initialize();
static void Realize();
static void Redisplay();
static void Resize();
static void Destroy();
static Boolean SetValues();

void SWUnscale();
void SWAutoscale();
void SWInitialSize();
void RequestSelection();
void GrabSelection();
 
static XtActionsRec actions[] =
{
{"unscale", SWUnscale},
{"autoscale", SWAutoscale},
{"initial-size", SWInitialSize},
{"paste", RequestSelection},
{"cut", GrabSelection}
};

static char translations[] =
"\
 <Key>u:           unscale()\n\
 <Key>a:           autoscale()\n\
 <Key>i:           initial-size()\n\
";

ScaleClassRec scaleClassRec = {
{   /* core fields */
    /* superclass		*/	(WidgetClass) &simpleClassRec,
    /* class_name		*/	"Scale",
    /* widget_size		*/	sizeof(ScaleRec),
    /* class_initialize		*/	ClassInitialize,
    /* class_part_initialize	*/	NULL,
    /* class_inited		*/	FALSE,
    /* initialize		*/	Initialize,
    /* initialize_hook		*/	NULL,
    /* realize			*/	Realize,
    /* actions			*/	actions,
    /* num_actions		*/	XtNumber(actions),
    /* resources		*/	resources,
    /* num_resources		*/	XtNumber(resources),
    /* xrm_class		*/	NULLQUARK,
    /* compress_motion		*/	TRUE,
    /* compress_exposure	*/      XtExposeCompressMaximal|
                                        XtExposeGraphicsExposeMerged,
    /* compress_enterleave	*/	TRUE,
    /* visible_interest		*/	TRUE,
    /* destroy			*/	Destroy,
    /* resize			*/	Resize,
    /* expose			*/	Redisplay,
    /* set_values		*/	SetValues,
    /* set_values_hook		*/	NULL,
    /* set_values_almost	*/	XtInheritSetValuesAlmost,
    /* get_values_hook		*/	NULL,
    /* accept_focus		*/	NULL,
    /* version			*/	XtVersion,
    /* callback_private		*/	NULL,
    /* tm_table			*/      translations,
    /* query_geometry		*/	XtInheritQueryGeometry,
    /* display_accelerator	*/	XtInheritDisplayAccelerator,
    /* extension		*/	NULL
  },
  { 
    /* change_sensitive		*/	XtInheritChangeSensitive,
  }
};
 
WidgetClass scaleWidgetClass = (WidgetClass) &scaleClassRec;
    


/*
 * Private Procedures
 */


static void ClassInitialize()
{
} 



void GetGC(sw)
    ScaleWidget sw;
{
    XGCValues values;
    
    values.foreground = sw->scale.foreground_pixel;
    values.background = sw->core.background_pixel;
    values.function = GXcopy;
    
    sw->scale.gc = XtGetGC((Widget) sw,
			   GCForeground | 
			   GCBackground | 
			   GCFunction,
			   &values);
}



void Proportional();

void GetInitialScaleValues(sw)
    ScaleWidget sw;
{
    if (sw->scale.proportional) {
	sw->scale.scale_x = sw->scale.scale_y =
	    ((sw->scale.aspect_ratio > 1.0) ?
	     sw->scale.aspect_ratio : 1.0 / sw->scale.aspect_ratio) *
		 (sw->scale.precision > 1.0 ?
		  sw->scale.precision : 1.0);
	Proportional(sw); /* need to cut them down to proper values */
    }
    else
	sw->scale.scale_x = sw->scale.scale_y = 1.0;
}



void GetRectangleBuffer(sw, buffer_size)
    ScaleWidget sw;
    Cardinal buffer_size;
    /*
     * This procedure will realloc a new rectangles buffer.
     * If the new buffer size is less than nrectangles, some
     * information will be lost.
     */
{
    if (buffer_size == 0) {
	buffer_size = DefaultBufferSize;
	XtWarning("buffer size has to be a positive number greater than zero");
    }
    sw->scale.rectangles = (XRectangle *)
	XtRealloc((char *) sw->scale.rectangles, 
		  buffer_size * sizeof(XRectangle));
    sw->scale.buffer_size = buffer_size;
}



/* ARGSUSED */
static void Initialize(request, new, args, num_args)
    Widget request, new;
    ArgList args;
    Cardinal *num_args;
{
    ScaleWidget new_sw = (ScaleWidget) new;
    
    new_sw->scale.table.x = (Position *) NULL;
    new_sw->scale.table.y = (Position *) NULL;
    new_sw->scale.table.width = (Dimension *) NULL;
    new_sw->scale.table.height = (Dimension *) NULL;
    
    new_sw->scale.nrectangles = 0;
    new_sw->scale.rectangles = (XRectangle *) NULL;
    
    GetRectangleBuffer(new_sw, new_sw->scale.buffer_size);
    
    GetGC(new_sw);
    
    if (new_sw->scale.image != NULL) {
	if (new_sw->core.width == 0)
	    new_sw->core.width = 
		new_sw->scale.image->width + 2 * new_sw->scale.internal_width;
	if (new_sw->core.height == 0)
	    new_sw->core.height = 
		new_sw->scale.image->height + 2 *new_sw->scale.internal_height;
    }
    else {
	if (new_sw->core.width == 0)
	    new_sw->core.width = 1 + 2 * new_sw->scale.internal_width;
	if (new_sw->core.height == 0)
	    new_sw->core.height = 1 + 2 * new_sw->scale.internal_height;
	new_sw->scale.image = XCreateImage(XtDisplay(new),
				       DefaultVisual(XtDisplay(new), 
					        DefaultScreen(XtDisplay(new))),
				       1, XYBitmap, 0, 
				       XtCalloc(1, sizeof(char)),
				       1, 1, 8, 0);
    }

    if ((new_sw->scale.aspect_ratio = 
	 atof(new_sw->scale.aspect_ratio_str)) < 0.0) {
	new_sw->scale.aspect_ratio = 1.0;
	XtWarning("AspectRatio has to be a positive number. (forced to 1.0)");
    }

    if ((new_sw->scale.precision =
         atof(new_sw->scale.precision_str)) < 0.0) {
	new_sw->scale.precision = 0.001;
	XtWarning("Precision has to be a positive number. (forced to 0.001)");
    }
    
    if (new_sw->scale.scale_x_str == DefaultScaleFactor
	|| 
	new_sw->scale.scale_y_str == DefaultScaleFactor)
	GetInitialScaleValues(new_sw);
    else {
	if ((new_sw->scale.scale_x = 
	     atof(new_sw->scale.scale_x_str)) < 0.0) {
	    new_sw->scale.scale_x = 1.0;
	    XtWarning("ScaleValue has to be a positive number. (forced to 1.0)");
	}
	if ((new_sw->scale.scale_y = 
	     atof(new_sw->scale.scale_y_str)) < 0.0) {
	    new_sw->scale.scale_y = 1.0;
	    XtWarning("ScaleValue has to be a positive number. (forced to 1.0)");
	}
    }
}



void BuildTable(sw)
    ScaleWidget sw;
    /* 
     * This procedure builds scaling table for image in the scale struct
     * Requires image, scale_x and scale_y to be set properly
     */
{
    Position x, y;
    
    XtFree((char *) sw->scale.table.x);
    XtFree((char *) sw->scale.table.y);
    XtFree((char *) sw->scale.table.width);
    XtFree((char *) sw->scale.table.height);
    sw->scale.table.x = 
	(Position *) XtMalloc(sizeof(Position) * sw->scale.image->width);
    sw->scale.table.y = 
	(Position *) XtMalloc(sizeof(Position) * sw->scale.image->height);
    sw->scale.table.width = 
	(Dimension *) XtMalloc(sizeof(Dimension) * sw->scale.image->width);
    sw->scale.table.height = 
	(Dimension *) XtMalloc(sizeof(Dimension) * sw->scale.image->height);
    
    /* Build the scaling table */	
    for (x = 0; x < sw->scale.image->width; x++) {
	sw->scale.table.x[(int) x] = (Position) myrint(sw->scale.scale_x * x);
	sw->scale.table.width[(int) x] = (Dimension)
	    myrint(sw->scale.scale_x *(x + 1)) - myrint(sw->scale.scale_x * x);
    }
    for (y = 0; y < sw->scale.image->height; y++) {
	sw->scale.table.y[(int) y] = (Position) myrint(sw->scale.scale_y * y);
	sw->scale.table.height[(int) y] = (Dimension)
	    myrint(sw->scale.scale_y *(y + 1)) - myrint(sw->scale.scale_y * y);
    }
}



void FlushRectangles(sw, drawable, gc)
    ScaleWidget sw;
    Drawable drawable;
    GC gc;
{
    XFillRectangles(XtDisplay(sw), drawable, gc, 
		    sw->scale.rectangles, sw->scale.nrectangles);
    
    sw->scale.nrectangles = 0;
}



void FillRectangle(sw, drawable, gc, x, y, width, height)
    ScaleWidget sw;
    Drawable drawable;
    GC gc;
    Position x, y;
    Dimension width, height;
{
    
    if (sw->scale.nrectangles == sw->scale.buffer_size)
	FlushRectangles(sw, drawable, gc);

    sw->scale.rectangles[(int) sw->scale.nrectangles].x = x;
    sw->scale.rectangles[(int) sw->scale.nrectangles].y = y;
    sw->scale.rectangles[(int) sw->scale.nrectangles].width = width;
    sw->scale.rectangles[(int) sw->scale.nrectangles].height = height;

    ++sw->scale.nrectangles;
}



void ScaleImage(sw, drawable, img_x, img_y, dst_x, dst_y, img_width,img_height)
    ScaleWidget sw;
    Drawable drawable;
    Position img_x, img_y;
    Position dst_x, dst_y;
    Dimension img_width, img_height;
    /* 
     * This procedure scales image into the specified drawable
     * It assumes scaling table was already built
     */
{
    GC gc;
    XGCValues gcv;
    Position x, y;
    Pixel pixel;
    
    /* Clip the img coordinates */
    img_x = min(max(img_x, 0), (Position) sw->scale.image->width - 1);
    img_y = min(max(img_y, 0), (Position) sw->scale.image->height - 1);
    img_width = 
      min(img_width, (Dimension)(sw->scale.image->width - (Dimension)img_x));
    img_height = 
      min(img_height, (Dimension)(sw->scale.image->height - (Dimension)img_y));

    if (sw->scale.scale_x == 1.0 && sw->scale.scale_y == 1.0) 
	XPutImage(XtDisplay(sw), drawable, sw->scale.gc, sw->scale.image, 
		  img_x, img_y, dst_x, dst_y, 
		  img_width, img_height);
    else {
	dst_x = dst_x - sw->scale.table.x[(int) img_x];
	dst_y = dst_y - sw->scale.table.y[(int) img_y];

	gc = XCreateGC(XtDisplay(sw), drawable, 0, NULL);

	gcv.function = GXcopy;
	XChangeGC(XtDisplay(sw), gc, GCFunction, &gcv);

	/* make sure gc knows the right background */
	gcv.background = sw->core.background_pixel;
	XChangeGC(XtDisplay(sw), gc, GCBackground, &gcv);	

	/* Set the background of drawable.  If the most frequent color
	   is the background color it can speed up scaling process. */
	gcv.foreground = gcv.background;
	XChangeGC(XtDisplay(sw), gc, GCForeground, &gcv);
	XFillRectangle(XtDisplay(sw), drawable, gc, 
		       sw->scale.table.x[(int) img_x] + dst_x, 
		       sw->scale.table.y[(int) img_y] + dst_y, 
		       sw->scale.table.x[(int) img_x + img_width - 1] - 
		       sw->scale.table.x[(int) img_x], 
		       sw->scale.table.y[(int) img_y + img_height - 1] - 
		       sw->scale.table.y[(int) img_y]);
	
	if (sw->scale.image->format == XYBitmap) {
	    for (x = img_x; x < img_x + (Position)img_width; x++)
		for (y = img_y; y < img_y + (Position)img_height; y++) {
		    pixel = XGetPixel(sw->scale.image, x, y);
		    if (pixel) /* Do not draw background */
			FillRectangle(sw, drawable, sw->scale.gc, 
				      sw->scale.table.x[(int) x] + dst_x, 
				      sw->scale.table.y[(int) y] + dst_y, 
				      sw->scale.table.width[(int) x], 
				      sw->scale.table.height[(int) y]);
		}
	    FlushRectangles(sw, drawable, sw->scale.gc);
	}
	else {
	    for (x = img_x; x < img_x + (Position)img_width; x++)
		for (y = img_y; y < img_y + (Position)img_height; y++) {
		    pixel = XGetPixel(sw->scale.image, x, y);
		    if (pixel != gcv.background) { /* Do not draw background */
			if (gcv.foreground != pixel) { /* Change fg to pixel */
			    gcv.foreground = pixel;
			    XChangeGC(XtDisplay(sw), gc, GCForeground, &gcv);
			}
			XFillRectangle(XtDisplay(sw), drawable, gc,
				       sw->scale.table.x[(int) x] + dst_x, 
				       sw->scale.table.y[(int) y] + dst_y, 
				       sw->scale.table.width[(int) x], 
				       sw->scale.table.height[(int) y]);
		    }
		}
	}
	XFreeGC(XtDisplay(sw), gc);
    }
}



int FindPixel(sw, x, y, img_x, img_y, img_pixel)
    ScaleWidget sw;
    Position x, y; /* (x,y) == (0,0) where image starts in sw window*/
    Position *img_x, *img_y;
    Pixel    *img_pixel;
{
    if (*img_x < 0 || *img_x >= sw->scale.image->width 
	||
	*img_y < 0 || *img_y >= sw->scale.image->height)
	return (-1);
    
    if (sw->scale.table.x[(int) *img_x] >= x) {
	--*img_x;
	return FindPixel(sw, x, y, img_x, img_y, img_pixel);
    }
    if (sw->scale.table.x[(int) *img_x] + 
	(Position)sw->scale.table.width[(int) *img_x] < x) {
	++*img_x;
	return FindPixel(sw, x, y, img_x, img_y, img_pixel);
    }
    if (sw->scale.table.y[(int) *img_y] >= y) {
	--*img_y;
	return FindPixel(sw, x, y, img_x, img_y, img_pixel);
    }
    if (sw->scale.table.y[(int) *img_y] + 
	(Position)sw->scale.table.height[(int) *img_y] < y) {
	++*img_y;
	return FindPixel(sw, x, y, img_x, img_y, img_pixel);
    }
    
    *img_pixel = XGetPixel(sw->scale.image, *img_x, *img_y);
    
    return (0);
}



int SWGetImagePixel(w, x, y, img_x, img_y, img_pixel)
    Widget w;
    Position x, y;
    Position *img_x, *img_y;
    Pixel    *img_pixel;
{
    ScaleWidget sw = (ScaleWidget) w;
    
    x -= sw->scale.x;
    y -= sw->scale.y;
    
    *img_x = (Position) floor(x / sw->scale.scale_x);
    *img_y = (Position) floor(y / sw->scale.scale_y);
    
    return FindPixel(sw, x, y, img_x, img_y, img_pixel);
}



/* ARGSUSED */
static void Redisplay(w, event, region)
    Widget w;
    XEvent *event;
    Region region;
{
    ScaleWidget sw = (ScaleWidget) w;
    Position  x, y, img_x, img_y;
    Dimension width, height;

    if (event->type == Expose) {

	if (event->xexpose.x < sw->scale.x) {
	    x = 0;
	    width = event->xexpose.width -
		(sw->scale.x - event->xexpose.x);
	}
	else {
	    x = event->xexpose.x - sw->scale.x;
	    width = event->xexpose.width;
	}
	
	if (event->xexpose.y < sw->scale.y) {
	    y = 0;
	    height = event->xexpose.height -
		(sw->scale.y - event->xexpose.y);
	}
	else {
	    y = event->xexpose.y - sw->scale.y;
	    height = event->xexpose.height;
	}
	
	img_x = min(max((Position) floor((float) x 
					 / (float) sw->scale.scale_x), 0),
		    (Position) sw->scale.image->width - 1);

	img_y = min(max((Position) floor((float) y
					 / (float) sw->scale.scale_y), 0),
		    (Position) sw->scale.image->height - 1);
	
	if (sw->core.visible) {  
	    ScaleImage(sw, XtWindow(w),
		       img_x, img_y,
		       sw->scale.x + sw->scale.table.x[(int) img_x],
		       sw->scale.y + sw->scale.table.y[(int) img_y],
		       (Dimension) ceil((float) width
					/ sw->scale.scale_x) + 1, 
		       (Dimension) ceil((float) height
					/ sw->scale.scale_y) + 1);
	}
    }
}



void TryResize(sw)
    ScaleWidget sw;
{
    Dimension width, height;
    XtGeometryResult result;

    width = (Dimension) 
	floor(sw->scale.image->width * sw->scale.scale_x)
	    + 2 * sw->scale.internal_width;
    height = (Dimension) 
	floor(sw->scale.image->height * sw->scale.scale_y)
	    + 2 * sw->scale.internal_height;
    
    while ((result =   
/* SUPPRESS 530 */XtMakeResizeRequest((Widget)sw,width,height,&width,&height))
	   == XtGeometryAlmost);  
    
    if (result != XtGeometryNo) {
	sw->core.width = width;
	sw->core.height = height;
    }
}



void Precision(sw)
    ScaleWidget sw;
{
    if (sw->scale.scale_x != 1.0)
	sw->scale.scale_x = floor(sw->scale.scale_x / sw->scale.precision)
	    		    * sw->scale.precision;

    if (sw->scale.scale_y != 1.0)
	sw->scale.scale_y = floor(sw->scale.scale_y / sw->scale.precision)
			    * sw->scale.precision;
}



void Proportional(sw)
    ScaleWidget sw;
{
    float scale_x, scale_y;

    scale_x = sw->scale.scale_y / sw->scale.aspect_ratio;
    scale_y = sw->scale.scale_x * sw->scale.aspect_ratio;
    
    if (scale_x <= sw->scale.scale_x && scale_y <= sw->scale.scale_y) {
	if (scale_x > scale_y)
	    sw->scale.scale_x = scale_x;
	else
	    sw->scale.scale_y = scale_y;
    }
    else if (scale_x <= sw->scale.scale_x)
	sw->scale.scale_x = scale_x;
    else if (scale_y <= sw->scale.scale_y)
	sw->scale.scale_y = scale_y;
    else {
	float x_ratio, y_ratio;
	
	x_ratio = scale_x / sw->scale.scale_x;
	y_ratio = scale_y / sw->scale.scale_y;
	
	if (x_ratio < y_ratio)
	    sw->scale.scale_y /= x_ratio;
	else
	    sw->scale.scale_x /= y_ratio;
    }

    if (fabs(sw->scale.scale_x / sw->scale.scale_y * sw->scale.aspect_ratio 
	    - 1.0) > sw->scale.precision)
	XtWarning("can not preserve aspect ratio");
}



void GetScaledSize(sw)
    ScaleWidget sw;
{
    sw->scale.width = (Dimension)
	max(myrint(sw->scale.scale_x * sw->scale.image->width), 1);
    sw->scale.height = (Dimension)
	max(myrint(sw->scale.scale_y * sw->scale.image->height), 1);
}



void GetScaleValues(sw)
    ScaleWidget sw;
{
    /*
     * Make sure to subtract internal width and height.
     */
    
    sw->scale.scale_x = 
	(float) max((int)(sw->core.width - 2 * sw->scale.internal_width), 1)
	    / (float) sw->scale.image->width;

    sw->scale.scale_y =
	(float) max((int)(sw->core.height - 2 * sw->scale.internal_height), 1)
	    / (float) sw->scale.image->height;
}



void Unscale(sw)
    ScaleWidget sw;
{
    sw->scale.scale_x = sw->scale.scale_y = 1.0;
 
    GetScaledSize(sw);		
    
    BuildTable(sw);
}



void Autoscale(sw)
    ScaleWidget sw;
{
    GetScaleValues(sw);

    if (sw->scale.proportional) Proportional(sw);

    Precision(sw);

    GetScaledSize(sw);
    
    BuildTable(sw);
}



void PositionImage(sw)
    ScaleWidget sw;
{
    /*
     * Set as if for ForgegGravity (that is center the image)
     */
    sw->scale.x = (Position) 
	(sw->core.width - sw->scale.width) / 2;
    sw->scale.y = (Position)
	(sw->core.height - sw->scale.height) / 2;
    
/*****
    if (sw->scale.gravity & WestGravity) { 
    }
    if (sw->scale.gravity & EastGravity) { 
    }
    if (sw->scale.gravity & NorthGravity) {
    }
    if (sw->scale.gravity & SouthGravity) {
    }
*****/
}



static void Resize(w)
    Widget w;
{
    ScaleWidget sw = (ScaleWidget) w;
    
    if (sw->scale.autoscale) Autoscale(sw);
    
    PositionImage(sw);
}



static void Realize(wid, vmask, attr)
        Widget wid;
        Mask *vmask;
        XSetWindowAttributes *attr;
{
  ScaleWidget sw = (ScaleWidget) wid;
  XtCreateWindow(wid, (unsigned int) InputOutput,
		 (Visual *) sw->scale.visual, *vmask, attr);
}
 


static void Destroy(w)
    Widget w;
{
    ScaleWidget sw = (ScaleWidget) w; 

    XtFree((char *) sw->scale.table.x);
    XtFree((char *) sw->scale.table.y);
    XtFree((char *) sw->scale.table.width);
    XtFree((char *) sw->scale.table.height);
    
    XtFree((char *) sw->scale.rectangles);

    XtReleaseGC(w, sw->scale.gc);

    XDestroyImage(sw->scale.image);
}



/* ARGSUSED */
static Boolean SetValues(current, request, new, args, num_args)
    Widget current, request, new;
    ArgList args;
    Cardinal *num_args;
{
    ScaleWidget cur_sw = (ScaleWidget) current;
    /* ScaleWidget req_sw = (ScaleWidget) request; */
    ScaleWidget new_sw = (ScaleWidget) new;
    Boolean redisplay = False;
    int i;
    
    for (i = 0; i < *num_args; i++) {
	if (streq(XtNbackground, args[i].name)) {
	    XSetBackground(XtDisplay(new), new_sw->scale.gc, 
			   new_sw->core.background_pixel);
	}
	if (streq(XtNforeground, args[i].name)) {
	    XSetForeground(XtDisplay(new), new_sw->scale.gc, 
			   new_sw->scale.foreground_pixel);
	}
	if (streq(XtNimage, args[i].name)) {
	    XDestroyImage(cur_sw->scale.image);
	    if (new_sw->scale.image == NULL)
		new_sw->scale.image = XCreateImage(XtDisplay(new),
						DefaultVisual(XtDisplay(new), 
						DefaultScreen(XtDisplay(new))),
						   1, XYBitmap, 0, 
						   XtCalloc(1, sizeof(char)),
						   1, 1, 8, 0);
	    else
		new_sw->scale.image = 
		    XSubImage(new_sw->scale.image, 
			      0, 0, 
			      new_sw->scale.image->width, 
			      new_sw->scale.image->height);

	    if (new_sw->scale.resize)
		TryResize(new_sw);
	    if (new_sw->scale.autoscale)
		Autoscale(new_sw);
	    else {
		GetScaledSize(new_sw);
		BuildTable(new_sw);
	    }
	    PositionImage(new_sw);
	    redisplay = True;
	}

	if (streq(XtNuserData, args[i].name)) 
	  new_sw->scale.userData = (XtPointer)args[i].value;

	if (streq(XtNbufferSize, args[i].name)) {
	    if (new_sw->scale.buffer_size != cur_sw->scale.buffer_size) {
		GetRectangleBuffer(new_sw, new_sw->scale.buffer_size);
	    }
	}

	if (streq(XtNaspectRatio, args[i].name)) {
	    if ((new_sw->scale.aspect_ratio = 
		 atof(new_sw->scale.aspect_ratio_str)) < 0.0) {
		new_sw->scale.aspect_ratio = cur_sw->scale.aspect_ratio;
		XtWarning("AspectRatio has to be a positive number.");
	    }
	    else if (new_sw->scale.aspect_ratio != cur_sw->scale.aspect_ratio){
		if (new_sw->scale.proportional) {
		    Proportional(new_sw);
		    Precision(new_sw);
		    GetScaledSize(new_sw);
		    BuildTable(new_sw);
		    PositionImage(new_sw);
		    redisplay = True;
		}
	    }
	}
	
	if (streq(XtNproportional, args[i].name)) {
	    if (new_sw->scale.proportional != cur_sw->scale.proportional) {
		if (new_sw->scale.proportional) Proportional(new_sw);
		Precision(new_sw);
		GetScaledSize(new_sw);
		BuildTable(new_sw);
		PositionImage(new_sw);
		redisplay = True;
	    }
	}
	
	if (streq(XtNscaleX, args[i].name)
	    || 
	    streq(XtNscaleY, args[i].name)) {
	    if (new_sw->scale.scale_x_str == DefaultScaleFactor
		|| 
		new_sw->scale.scale_y_str == DefaultScaleFactor)
		GetInitialScaleValues(new_sw);
	    else {
		if ((new_sw->scale.scale_x = 
		     atof(new_sw->scale.scale_x_str)) < 0.0) {
		    new_sw->scale.scale_x = cur_sw->scale.scale_x;
		    XtWarning("ScaleValue has to be a positive number.");
		}
		if ((new_sw->scale.scale_y = 
		     atof(new_sw->scale.scale_y_str)) < 0.0) {
		    new_sw->scale.scale_y = cur_sw->scale.scale_y;
		    XtWarning("ScaleValue has to be a positive number.");
		}
	    }
	    if (new_sw->scale.scale_x != cur_sw->scale.scale_x
		||
		new_sw->scale.scale_y != cur_sw->scale.scale_y) {
		
		/*?*?*?*?*?*?*?*?*?*?*?*?*?*?**?*?*?*?*?*?*?*?*?***?*/
		fprintf(stderr, "================>>%f %f\n",
			new_sw->scale.scale_x, new_sw->scale.scale_y);
		
		if (new_sw->scale.proportional) Proportional(new_sw);
		Precision(new_sw);
		if (new_sw->scale.resize)
		    TryResize(new_sw);
		GetScaledSize(new_sw);		
		BuildTable(new_sw);
		PositionImage(new_sw);
		redisplay = True;
	    }
	}
	
	if (streq(XtNprecision, args[i].name)) {
	    if ((new_sw->scale.precision = 
		 atof(new_sw->scale.precision_str)) < 0.0) {
		new_sw->scale.precision = cur_sw->scale.precision;
		XtWarning("Precision has to be a positive number.");
	    }
	    if (new_sw->scale.precision != cur_sw->scale.precision) {
		if (new_sw->scale.proportional) Proportional(new_sw);
		Precision(new_sw);
		GetScaledSize(new_sw);		
		BuildTable(new_sw);
		PositionImage(new_sw);
		redisplay = True;
	    }
	}
    }		    
    return(redisplay);
}



void SWUnscale(w, event, params, num_params)
    Widget w;
    XEvent *event;
    String *params;
    Cardinal *num_params;
{
    ScaleWidget sw = (ScaleWidget) w;

    Unscale(sw);
    PositionImage(sw);
    XClearArea(XtDisplay(w), XtWindow(w), 0, 0, 0, 0, True);
}



void SWAutoscale(w, event, params, num_params)
    Widget w;
    XEvent *event;
    String *params;
    Cardinal *num_params;
{
    ScaleWidget sw = (ScaleWidget) w;

    Autoscale(sw);
    PositionImage(sw);
    XClearArea(XtDisplay(w), XtWindow(w), 0, 0, 0, 0, True);
}



void SWInitialSize(w, event, params, num_params)
    Widget w;
    XEvent *event;
    String *params;
    Cardinal *num_params;
{
    ScaleWidget sw = (ScaleWidget) w;
    
    GetInitialScaleValues(sw);

    if (sw->scale.proportional) Proportional(sw);
    Precision(sw);
    if (sw->scale.resize)
	TryResize(sw);
    GetScaledSize(sw);		
    BuildTable(sw);
    PositionImage(sw);
    XClearArea(XtDisplay(w), XtWindow(w), 0, 0, 0, 0, True);
}



void SWSetImage(w, image)
    Widget w;
    XImage *image;
{
    int n;
    Arg wargs[2];
    
    n = 0;
    XtSetArg(wargs[n], XtNimage, (XtArgVal) image); n++;
    XtSetValues(w, wargs, n);
}



extern void SWRequestSelection();

void RequestSelection(w, event, params, num_params)
    Widget w;
    XEvent *event;
    String *params;
    Cardinal *num_params;
{
    SWRequestSelection(w, event->xbutton.time);
}



extern void SWGrabSelection();

void GrabSelection(w, event, params, num_params)
    Widget w;
    XEvent *event;
    String *params;
    Cardinal *num_params;
{
    SWGrabSelection(w, event->xbutton.time);
}



Pixmap SWGetPixmap(w)
    Widget w;
{
    ScaleWidget sw = (ScaleWidget) w;
    Pixmap pixmap;

    pixmap = XCreatePixmap(XtDisplay(w), XtWindow(w), 
			   sw->scale.width, 
			   sw->scale.height, 
			   sw->scale.image->depth);
    ScaleImage(sw, pixmap, 
	       0, 0, 0, 0, 
	       (Dimension) sw->scale.image->width, 
	       (Dimension) sw->scale.image->height);
    
    return(pixmap);
}