ioncore/sizepolicy.c

   1 /*
   2  * ion/ioncore/sizepolicy.c
   3  *
   4  * Copyright (c) Tuomo Valkonen 1999-2009.
   5  *
   6  * See the included file LICENSE for details.
   7  */
   8
   9 #include <libtu/minmax.h>
  10 #include <string.h>
  11
  12 #include "common.h"
  13 #include "region.h"
  14 #include "resize.h"
  15 #include "sizehint.h"
  16 #include "sizepolicy.h"
  17
  18
  19
  20 static int fit_x(int x, int w, const WRectangle *max_geom)
  21 {
  22     int mw=maxof(max_geom->w, 1);
  23     w=minof(mw, w);
  24     return minof(maxof(x, max_geom->x), max_geom->x+mw-w);
  25 }
  26
  27
  28 static int fit_y(int y, int h, const WRectangle *max_geom)
  29 {
  30     int mh=maxof(max_geom->h, 1);
  31     h=minof(mh, h);
  32     return minof(maxof(y, max_geom->y), max_geom->y+mh-h);
  33 }
  34
  35
  36 static void do_gravity(const WRectangle *max_geom, int szplcy,
  37                        WRectangle *geom)
  38 {
  39     /* Assumed: width and height already adjusted within limits */
  40     if(geom->h<1)
  41         geom->h=1;
  42     if(geom->w<1)
  43         geom->w=1;
  44
  45     switch(szplcy&SIZEPOLICY_HORIZ_MASK){
  46     case SIZEPOLICY_HORIZ_LEFT:
  47         geom->x=max_geom->x;
  48         break;
  49
  50     case SIZEPOLICY_HORIZ_RIGHT:
  51         geom->x=max_geom->x+max_geom->w-geom->w;
  52         break;
  53
  54     case SIZEPOLICY_HORIZ_CENTER:
  55         geom->x=max_geom->x+max_geom->w/2-geom->w/2;
  56         break;
  57
  58     default:
  59         geom->x=fit_x(geom->x, geom->w, max_geom);
  60     }
  61
  62     switch(szplcy&SIZEPOLICY_VERT_MASK){
  63     case SIZEPOLICY_VERT_TOP:
  64         geom->y=max_geom->y;
  65         break;
  66
  67     case SIZEPOLICY_VERT_BOTTOM:
  68         geom->y=max_geom->y+max_geom->h-geom->h;
  69         break;
  70
  71     case SIZEPOLICY_VERT_CENTER:
  72         geom->y=max_geom->y+max_geom->h/2-geom->h/2;
  73         break;
  74
  75     default:
  76         geom->y=fit_x(geom->y, geom->h, max_geom);
  77     }
  78 }
  79
  80
  81 static void gravity_stretch_policy(int szplcy, WRegion *reg,
  82                                    const WRectangle *rq_geom, WFitParams *fp,
  83                                    bool ws, bool hs)
  84 {
  85     WRectangle max_geom=fp->g;
  86     int w, h;
  87
  88     fp->g=*rq_geom;
  89
  90     w=(ws ? max_geom.w : minof(rq_geom->w, max_geom.w));
  91     h=(hs ? max_geom.h : minof(rq_geom->h, max_geom.h));
  92
  93     if(reg!=NULL)
  94         region_size_hints_correct(reg,  &w, &h, FALSE);
  95
  96     fp->g.w=w;
  97     fp->g.h=h;
  98
  99     do_gravity(&max_geom, szplcy, &(fp->g));
 100 }
 101
 102
 103 static void sizepolicy_free_snap(WSizePolicy *szplcy, WRegion *reg,
 104                                  WRectangle *rq_geom, int rq_flags,
 105                                  WFitParams *fp)
 106 {
 107     WRectangle max_geom=fp->g;
 108     bool fullw=((rq_flags&REGION_RQGEOM_WEAK_W) &&
 109                 (*szplcy&SIZEPOLICY_HORIZ_MASK)==SIZEPOLICY_HORIZ_CENTER);
 110     bool fullh=((rq_flags&REGION_RQGEOM_WEAK_H) &&
 111                 (*szplcy&SIZEPOLICY_VERT_MASK)==SIZEPOLICY_VERT_CENTER);
 112
 113     int w=(fullw ? max_geom.w : minof(rq_geom->w, max_geom.w));
 114     int h=(fullh ? max_geom.h : minof(rq_geom->h, max_geom.h));
 115     int x_=0, y_=0;
 116
 117
 118     if(!(rq_flags&REGION_RQGEOM_WEAK_X)
 119        && rq_flags&REGION_RQGEOM_WEAK_W){
 120         x_=fit_x(rq_geom->x, 1, &max_geom);
 121         if(((*szplcy)&SIZEPOLICY_HORIZ_MASK)==SIZEPOLICY_HORIZ_RIGHT)
 122             w=max_geom.x+max_geom.w-x_;
 123         else
 124             w=minof(w, max_geom.x+max_geom.w-x_);
 125     }
 126
 127     if(!(rq_flags&REGION_RQGEOM_WEAK_Y)
 128        && rq_flags&REGION_RQGEOM_WEAK_H){
 129         y_=fit_x(rq_geom->y, 1, &max_geom);
 130         if(((*szplcy)&SIZEPOLICY_VERT_MASK)==SIZEPOLICY_VERT_BOTTOM)
 131             h=max_geom.y+max_geom.h-y_;
 132         else
 133             h=minof(h, max_geom.y+max_geom.h-y_);
 134     }
 135
 136     if(reg!=NULL)
 137         region_size_hints_correct(reg, &w, &h, FALSE);
 138
 139     fp->g.w=w;
 140     fp->g.h=h;
 141
 142     if(!(rq_flags&REGION_RQGEOM_WEAK_X)
 143        && rq_flags&REGION_RQGEOM_WEAK_W){
 144         fp->g.x=x_;
 145     }else if(rq_flags&REGION_RQGEOM_WEAK_X){
 146         switch((*szplcy)&SIZEPOLICY_HORIZ_MASK){
 147         case SIZEPOLICY_HORIZ_CENTER:
 148             fp->g.x=max_geom.x+(max_geom.w-w)/2;
 149             break;
 150
 151         case SIZEPOLICY_HORIZ_LEFT:
 152             fp->g.x=max_geom.x;
 153             break;
 154
 155         case SIZEPOLICY_HORIZ_RIGHT:
 156             fp->g.x=max_geom.x+max_geom.w-w;
 157             break;
 158
 159         default:
 160             fp->g.x=fit_x(rq_geom->x, w, &max_geom);
 161             break;
 162         }
 163     }else{
 164         fp->g.x=fit_x(rq_geom->x, w, &max_geom);
 165     }
 166
 167     if(!(rq_flags&REGION_RQGEOM_WEAK_Y)
 168        && rq_flags&REGION_RQGEOM_WEAK_H){
 169         fp->g.y=y_;
 170     }else if(rq_flags&REGION_RQGEOM_WEAK_Y){
 171         switch((*szplcy)&SIZEPOLICY_VERT_MASK){
 172         case SIZEPOLICY_VERT_CENTER:
 173             fp->g.y=max_geom.y+(max_geom.h-h)/2;
 174             break;
 175
 176         case SIZEPOLICY_VERT_TOP:
 177             fp->g.y=max_geom.y;
 178             break;
 179
 180         case SIZEPOLICY_VERT_BOTTOM:
 181             fp->g.y=max_geom.y+max_geom.h-h;
 182             break;
 183
 184         default:
 185             fp->g.y=fit_y(rq_geom->y, h, &max_geom);
 186             break;
 187         }
 188     }else{
 189         fp->g.y=fit_y(rq_geom->y, h, &max_geom);
 190     }
 191
 192     (*szplcy)&=~(SIZEPOLICY_VERT_MASK|SIZEPOLICY_HORIZ_MASK);
 193
 194     *szplcy|=( (fullw || fp->g.x<=max_geom.x ? SIZEPOLICY_HORIZ_LEFT : 0)
 195               |(fullw || fp->g.x+fp->g.w>=max_geom.x+max_geom.w ? SIZEPOLICY_HORIZ_RIGHT : 0)
 196               |(fullh || fp->g.y<=max_geom.y ? SIZEPOLICY_VERT_TOP : 0)
 197               |(fullh || fp->g.y+fp->g.h>=max_geom.y+max_geom.h ? SIZEPOLICY_VERT_BOTTOM : 0));
 198 }
 199
 200
 201 static WSizePolicy org(WSizePolicy base, WSizePolicy g)
 202 {
 203     if((base&SIZEPOLICY_VERT_MASK)==0)
 204         base|=g&SIZEPOLICY_VERT_MASK;
 205
 206     if((base&SIZEPOLICY_HORIZ_MASK)==0)
 207         base|=g&SIZEPOLICY_HORIZ_MASK;
 208
 209     return base;
 210 }
 211
 212
 213 void sizepolicy(WSizePolicy *szplcy, WRegion *reg,
 214                 const WRectangle *rq_geom, int rq_flags,
 215                 WFitParams *fp)
 216 {
 217     uint extra=fp->mode&REGION_FIT_ROTATE;
 218
 219     WRectangle tmp;
 220     if(rq_geom!=NULL)
 221         tmp=*rq_geom;
 222     else if(reg!=NULL)
 223         tmp=REGION_GEOM(reg);
 224     else
 225         tmp=fp->g;
 226
 227     if((*szplcy)&SIZEPOLICY_SHRUNK){
 228         if(reg!=NULL){
 229             tmp.w=region_min_w(reg);
 230             tmp.h=region_min_h(reg);
 231         }else{
 232             tmp.w=1;
 233             tmp.h=1;
 234         }
 235         rq_flags&=~(REGION_RQGEOM_WEAK_W|REGION_RQGEOM_WEAK_H);
 236     }
 237
 238     fp->mode=REGION_FIT_EXACT|extra;
 239
 240     switch((*szplcy)&SIZEPOLICY_MASK){
 241     case SIZEPOLICY_GRAVITY:
 242         gravity_stretch_policy(*szplcy, reg, &tmp, fp, FALSE, FALSE);
 243         break;
 244
 245     case SIZEPOLICY_STRETCH_LEFT:
 246         gravity_stretch_policy(org(*szplcy, SIZEPOLICY_HORIZ_LEFT|SIZEPOLICY_VERT_CENTER),
 247                                reg, &tmp, fp, FALSE, TRUE);
 248         break;
 249
 250     case SIZEPOLICY_STRETCH_RIGHT:
 251         gravity_stretch_policy(org(*szplcy, SIZEPOLICY_HORIZ_RIGHT|SIZEPOLICY_VERT_CENTER),
 252                                reg, &tmp, fp, FALSE, TRUE);
 253         break;
 254
 255     case SIZEPOLICY_STRETCH_TOP:
 256         gravity_stretch_policy(org(*szplcy, SIZEPOLICY_VERT_TOP|SIZEPOLICY_HORIZ_CENTER),
 257                                reg, &tmp, fp, TRUE, FALSE);
 258         break;
 259
 260     case SIZEPOLICY_STRETCH_BOTTOM:
 261         gravity_stretch_policy(org(*szplcy, SIZEPOLICY_VERT_BOTTOM|SIZEPOLICY_HORIZ_CENTER),
 262                                reg, &tmp, fp, TRUE, FALSE);
 263         break;
 264
 265     case SIZEPOLICY_FULL_EXACT:
 266         gravity_stretch_policy(org(*szplcy, SIZEPOLICY_VERT_CENTER|SIZEPOLICY_HORIZ_CENTER),
 267                                reg, &tmp, fp, TRUE, TRUE);
 268         break;
 269
 270     case SIZEPOLICY_FREE:
 271         if(reg!=NULL)
 272             region_size_hints_correct(reg, &tmp.w, &tmp.h, FALSE);
 273         rectangle_constrain(&tmp, &(fp->g));
 274         fp->g=tmp;
 275         break;
 276
 277     case SIZEPOLICY_VISIBILITY_CONSTRAINED:
 278         if(reg!=NULL)
 279             region_size_hints_correct(reg, &tmp.w, &tmp.h, FALSE);
 280         {
 281             /* Constraint such that at least min(size, CF_VISIBILITY_CONSTRAINT)
 282              * much is visible at each border.
 283              */
 284             int dx=maxof(0, tmp.w-CF_VISIBILITY_CONSTRAINT);
 285             int dy=maxof(0, tmp.h-CF_VISIBILITY_CONSTRAINT);
 286             tmp.x=maxof(fp->g.x-dx, minof(tmp.x, fp->g.x+fp->g.w+dx-tmp.w));
 287             tmp.y=maxof(fp->g.y-dy, minof(tmp.y, fp->g.y+fp->g.h+dy-tmp.h));
 288         }
 289         fp->g=tmp;
 290         break;
 291
 292     case SIZEPOLICY_UNCONSTRAINED:
 293         if(reg!=NULL)
 294             region_size_hints_correct(reg, &tmp.w, &tmp.h, TRUE);
 295         fp->g=tmp;
 296         break;
 297
 298     case SIZEPOLICY_FREE_GLUE:
 299         sizepolicy_free_snap(szplcy, reg, &tmp, rq_flags, fp);
 300         break;
 301
 302     case SIZEPOLICY_FULL_BOUNDS:
 303     default:
 304         fp->mode=REGION_FIT_BOUNDS|extra;
 305         break;
 306     }
 307 }
 308
 309
 310 /* translation table for sizepolicy specifications */
 311 static StringIntMap szplcy_specs[] = {
 312     {"default",         SIZEPOLICY_DEFAULT},
 313     {"full",            SIZEPOLICY_FULL_EXACT},
 314     {"full_bounds",     SIZEPOLICY_FULL_BOUNDS},
 315     {"free",            SIZEPOLICY_FREE},
 316     {"free_glue",       SIZEPOLICY_FREE_GLUE},
 317     {"northwest",       SIZEPOLICY_GRAVITY_NORTHWEST},
 318     {"north",           SIZEPOLICY_GRAVITY_NORTH},
 319     {"northeast",       SIZEPOLICY_GRAVITY_NORTHEAST},
 320     {"west",            SIZEPOLICY_GRAVITY_WEST},
 321     {"center",          SIZEPOLICY_GRAVITY_CENTER},
 322     {"east",            SIZEPOLICY_GRAVITY_EAST},
 323     {"southwest",       SIZEPOLICY_GRAVITY_SOUTHWEST},
 324     {"south",           SIZEPOLICY_GRAVITY_SOUTH},
 325     {"southeast",       SIZEPOLICY_GRAVITY_SOUTHEAST},
 326     {"stretch_top",     SIZEPOLICY_STRETCH_TOP},
 327     {"stretch_bottom",  SIZEPOLICY_STRETCH_BOTTOM},
 328     {"stretch_left",    SIZEPOLICY_STRETCH_LEFT},
 329     {"stretch_right",   SIZEPOLICY_STRETCH_RIGHT},
 330     {"free_glue_northwest",  SIZEPOLICY_FREE_GLUE__NORTHWEST},
 331     {"free_glue_north",      SIZEPOLICY_FREE_GLUE__NORTH},
 332     {"free_glue_northeast",  SIZEPOLICY_FREE_GLUE__NORTHEAST},
 333     {"free_glue_west",       SIZEPOLICY_FREE_GLUE__WEST},
 334     {"free_glue_center",     SIZEPOLICY_FREE_GLUE__CENTER},
 335     {"free_glue_east",       SIZEPOLICY_FREE_GLUE__EAST},
 336     {"free_glue_southwest",  SIZEPOLICY_FREE_GLUE__SOUTHWEST},
 337     {"free_glue_south",      SIZEPOLICY_FREE_GLUE__SOUTH},
 338     {"free_glue_southeast",  SIZEPOLICY_FREE_GLUE__SOUTHEAST},
 339     {"visibility_constrained",   SIZEPOLICY_VISIBILITY_CONSTRAINED},
 340     {"unconstrained",   SIZEPOLICY_UNCONSTRAINED},
 341     { NULL,             SIZEPOLICY_DEFAULT}   /* end marker */
 342 };
 343
 344
 345 bool string2sizepolicy(const char *szplcy, WSizePolicy *value)
 346 {
 347     int tmp;
 348
 349     tmp=stringintmap_value(szplcy_specs, szplcy, -1);
 350
 351     if(tmp==-1){
 352         *value=SIZEPOLICY_DEFAULT;
 353         return FALSE;
 354     }else{
 355         *value=tmp;
 356         return TRUE;
 357     }
 358 }
 359
 360
 361 const char *sizepolicy2string(WSizePolicy szplcy)
 362 {
 363     return stringintmap_key(szplcy_specs, szplcy, NULL);
 364 }