162 lines
3.8 KiB
C
162 lines
3.8 KiB
C
/*
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FvwmButtons v2.0.41-plural-Z-alpha, copyright 1996, Jarl Totland
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* This module, and the entire GoodStuff program, and the concept for
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* interfacing this module to the Window Manager, are all original work
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* by Robert Nation
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*
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* Copyright 1993, Robert Nation. No guarantees or warantees or anything
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* are provided or implied in any way whatsoever. Use this program at your
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* own risk. Permission to use this program for any purpose is given,
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* as long as the copyright is kept intact.
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*/
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#include "misc.h"
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/**
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*** ConstrainSize()
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*** Adjust a given width and height to account for the constraints imposed by
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*** size hints.
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*** The general algorithm, especially the aspect ratio stuff, is borrowed from
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*** uwm's CheckConsistency routine.
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**/
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void ConstrainSize (XSizeHints *hints, int *widthp, int *heightp)
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{
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#define makemult(a,b) ((b==1) ? (a) : (((int)((a)/(b))) * (b)) )
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int minWidth, minHeight, maxWidth, maxHeight, xinc, yinc, delta;
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int baseWidth, baseHeight;
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int dwidth = *widthp, dheight = *heightp;
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if(hints->flags & PMinSize)
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{
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minWidth = hints->min_width;
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minHeight = hints->min_height;
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if(hints->flags & PBaseSize)
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{
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baseWidth = hints->base_width;
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baseHeight = hints->base_height;
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}
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else
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{
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baseWidth = hints->min_width;
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baseHeight = hints->min_height;
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}
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}
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else if(hints->flags & PBaseSize)
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{
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minWidth = hints->base_width;
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minHeight = hints->base_height;
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baseWidth = hints->base_width;
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baseHeight = hints->base_height;
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}
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else
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{
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minWidth = 1;
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minHeight = 1;
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baseWidth = 1;
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baseHeight = 1;
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}
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if(hints->flags & PMaxSize)
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{
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maxWidth = hints->max_width;
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maxHeight = hints->max_height;
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}
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else
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{
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maxWidth = 10000;
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maxHeight = 10000;
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}
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if(hints->flags & PResizeInc)
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{
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xinc = hints->width_inc;
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yinc = hints->height_inc;
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}
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else
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{
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xinc = 1;
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yinc = 1;
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}
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/*
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* First, clamp to min and max values
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*/
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if (dwidth < minWidth) dwidth = minWidth;
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if (dheight < minHeight) dheight = minHeight;
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if (dwidth > maxWidth) dwidth = maxWidth;
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if (dheight > maxHeight) dheight = maxHeight;
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/*
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* Second, fit to base + N * inc
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*/
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dwidth = ((dwidth - baseWidth) / xinc * xinc) + baseWidth;
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dheight = ((dheight - baseHeight) / yinc * yinc) + baseHeight;
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/*
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* Third, adjust for aspect ratio
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*/
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#define maxAspectX hints->max_aspect.x
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#define maxAspectY hints->max_aspect.y
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#define minAspectX hints->min_aspect.x
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#define minAspectY hints->min_aspect.y
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/*
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* The math looks like this:
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*
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* minAspectX dwidth maxAspectX
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* ---------- <= ------- <= ----------
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* minAspectY dheight maxAspectY
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*
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* If that is multiplied out, then the width and height are
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* invalid in the following situations:
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*
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* minAspectX * dheight > minAspectY * dwidth
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* maxAspectX * dheight < maxAspectY * dwidth
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*
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*/
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if (hints->flags & PAspect)
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{
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if (minAspectX * dheight > minAspectY * dwidth)
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{
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delta = makemult(minAspectX * dheight / minAspectY - dwidth,
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xinc);
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if (dwidth + delta <= maxWidth)
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dwidth += delta;
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else
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{
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delta = makemult(dheight - dwidth*minAspectY/minAspectX,
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yinc);
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if (dheight - delta >= minHeight) dheight -= delta;
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}
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}
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if (maxAspectX * dheight < maxAspectY * dwidth)
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{
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delta = makemult(dwidth * maxAspectY / maxAspectX - dheight,
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yinc);
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if (dheight + delta <= maxHeight)
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dheight += delta;
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else
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{
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delta = makemult(dwidth - maxAspectX*dheight/maxAspectY,
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xinc);
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if (dwidth - delta >= minWidth) dwidth -= delta;
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}
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}
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}
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*widthp = dwidth;
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*heightp = dheight;
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return;
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#undef makemult
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#undef maxAspectX
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#undef maxAspectY
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#undef minAspectX
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#undef minAspectY
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}
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