git.hungrycats.org Git - xscreensaver/blob - hacks/bumps.c

   1 /* -*- mode: C; tab-width: 4 -*-
   2  * Bumps, Copyright (c) 2002, 2006 Shane Smit <CodeWeaver@DigitalLoom.org>
   3  *
   4  * Permission to use, copy, modify, distribute, and sell this software and its
   5  * documentation for any purpose is hereby granted without fee, provided that
   6  * the above copyright notice appear in all copies and that both that
   7  * copyright notice and this permission notice appear in supporting
   8  * documentation.  No representations are made about the suitability of this
   9  * software for any purpose.  It is provided "as is" without express or
  10  * implied warranty.
  11  *
  12  * Module: "bumps.c"
  13  * Tab Size: 4
  14  *
  15  * Description:
  16  *  This is typical bump-mapping.  The actual bump map is generated by a screen
  17  *  grab.  The light source is represented by a spotlight of random color. This
  18  *  spotlight randomly traverses the bump map in a sinus pattern.
  19  *
  20  *  Essentially, it 3D-izes your desktop, based on color intensity.
  21  *
  22  * Modification History:
  23  *  [10/01/99] - Shane Smit: Creation
  24  *  [10/08/99] - Shane Smit: Port to C. (Ick)
  25  *  [03/08/02] - Shane Smit: New movement code.
  26  *  [09/12/02] - Shane Smit: MIT-SHM XImages.
  27  *                                                       Thanks to Kennett Galbraith <http://www.Alpha-II.com/>
  28  *                                                       for code optimization.
  29  */
  30
  31
  32 #include <math.h>
  33 #include <stdint.h>
  34 #include "screenhack.h"
  35
  36 #ifdef HAVE_XSHM_EXTENSION
  37 #include "xshm.h"
  38 #endif /* HAVE_XSHM_EXTENSION */
  39
  40
  41 /* Defines: */
  42 /* #define VERBOSE */
  43 #define RANDOM() ((int) (random() & 0X7FFFFFFFL))
  44
  45 typedef unsigned char   BOOL;
  46
  47
  48 /* Globals: */
  49
  50 static const char *bumps_defaults [] = {
  51   ".background: black",
  52   ".foreground: white",
  53   "*fpsSolid:   true",
  54   "*color:              random",
  55   "*colorcount: 64",
  56   "*delay:              30000",
  57   "*duration:   120",
  58   "*soften:             1",
  59   "*invert:             FALSE",
  60 #ifdef __sgi    /* really, HAVE_READ_DISPLAY_EXTENSION */
  61   "*visualID:   Best",
  62 #endif
  63 #ifdef HAVE_XSHM_EXTENSION
  64   "*useSHM:             True",
  65 #endif /* HAVE_XSHM_EXTENSION */
  66 #ifdef USE_IPHONE
  67   "*ignoreRotation: True",
  68 #endif
  69   0
  70 };
  71
  72 static XrmOptionDescRec bumps_options [] = {
  73   { "-color",           ".color",               XrmoptionSepArg, 0 },
  74   { "-colorcount",      ".colorcount",  XrmoptionSepArg, 0 },
  75   { "-duration",        ".duration",    XrmoptionSepArg, 0 },
  76   { "-delay",           ".delay",               XrmoptionSepArg, 0 },
  77   { "-soften",          ".soften",              XrmoptionSepArg, 0 },
  78   { "-invert",          ".invert",              XrmoptionNoArg, "TRUE" },
  79 #ifdef HAVE_XSHM_EXTENSION
  80   { "-shm",                     ".useSHM",              XrmoptionNoArg, "True" },
  81   { "-no-shm",          ".useSHM",              XrmoptionNoArg, "False" },
  82 #endif /* HAVE_XSHM_EXTENSION */
  83
  84   { 0, 0, 0, 0 }
  85 };
  86
  87
  88 /* This structure handles everything to do with the spotlight, and is designed to be
  89  * a member of TBumps. */
  90 typedef struct
  91 {
  92         uint8_t *aLightMap;
  93         uint16_t nFalloffDiameter, nFalloffRadius;
  94         uint16_t nLightDiameter, nLightRadius;
  95         float nAccelX, nAccelY;
  96         float nAccelMax;
  97         float nVelocityX, nVelocityY;
  98         float nVelocityMax;
  99         float nXPos, nYPos;
 100 } SSpotLight;
 101
 102
 103 /* The entire program's operation is contained within this structure. */
 104 typedef struct
 105 {
 106         /* XWindows specific variables. */
 107         Display *dpy;
 108         Window Win;
 109         Screen *screen;
 110         Pixmap source;
 111         GC GraphicsContext;
 112         XColor *xColors;
 113         unsigned long *aColors;
 114         XImage *pXImage;
 115 #ifdef HAVE_XSHM_EXTENSION
 116         XShmSegmentInfo XShmInfo;
 117         Bool    bUseShm;
 118 #endif /* HAVE_XSHM_EXTENSION */
 119
 120         uint8_t nColorCount;                            /* Number of colors used. */
 121         uint8_t bytesPerPixel;
 122         uint16_t iWinWidth, iWinHeight;
 123         uint16_t *aBumpMap;                             /* The actual bump map. */
 124         SSpotLight SpotLight;
 125
 126         int delay;
 127         int duration;
 128         time_t start_time;
 129
 130         async_load_state *img_loader;
 131 } SBumps;
 132
 133
 134 static void SetPalette(Display *, SBumps *, XWindowAttributes * );
 135 static void InitBumpMap(Display *, SBumps *, XWindowAttributes * );
 136 static void InitBumpMap_2(Display *, SBumps *);
 137 static void SoftenBumpMap( SBumps * );
 138
 139
 140
 141
 142 /* This function pointer will point to the appropriate PutPixel*() function below. */
 143 static void (*MyPutPixel)( int8_t *, uint32_t );
 144
 145 static void PutPixel32( int8_t *pData, uint32_t pixel )
 146 {
 147         *(uint32_t *)pData = pixel;
 148 }
 149
 150 static void PutPixel24( int8_t *pData, uint32_t pixel )
 151 {
 152         pData[ 2 ] = ( pixel & 0x00FF0000 ) >> 16;
 153         pData[ 1 ] = ( pixel & 0x0000FF00 ) >> 8;
 154         pData[ 0 ] = ( pixel & 0x000000FF );
 155 }
 156
 157 static void PutPixel16( int8_t *pData, uint32_t pixel )
 158 {
 159         *(uint16_t *)pData = (uint16_t)pixel;
 160 }
 161
 162 static void PutPixel8( int8_t *pData, uint32_t pixel )
 163 {
 164         *(uint8_t *)pData = (uint8_t)pixel;
 165 }
 166
 167 /* Creates the light map, which is a circular image... going from black around the edges
 168  * to white in the center. */
 169 static void CreateSpotLight( SSpotLight *pSpotLight, uint16_t iDiameter, uint16_t nColorCount )
 170 {
 171         double nDist;
 172         int16_t iDistX, iDistY;
 173         uint8_t *pLOffset;
 174
 175         pSpotLight->nFalloffDiameter = iDiameter;
 176         pSpotLight->nFalloffRadius = pSpotLight->nFalloffDiameter / 2;
 177         pSpotLight->nLightDiameter = iDiameter / 2;
 178         pSpotLight->nLightRadius = pSpotLight->nLightDiameter / 2;
 179 #ifdef VERBOSE
 180         printf( "%s: Falloff Diameter: %d\n", progclass, pSpotLight->nFalloffDiameter );
 181         printf( "%s: Spot Light Diameter: %d\n", progclass, pSpotLight->nLightDiameter );
 182 #endif
 183
 184         pSpotLight->aLightMap = malloc( pSpotLight->nLightDiameter * pSpotLight->nLightDiameter * sizeof(uint8_t) );
 185
 186         pLOffset = pSpotLight->aLightMap;
 187         for( iDistY=-pSpotLight->nLightRadius; iDistY<pSpotLight->nLightRadius; ++iDistY )
 188         {
 189                 for( iDistX=-pSpotLight->nLightRadius; iDistX<pSpotLight->nLightRadius; ++iDistX )
 190                 {
 191                         nDist = sqrt( pow( iDistX+0.5F, 2 ) + pow( iDistY+0.5F, 2 ) );
 192                         if( nDist / pSpotLight->nLightRadius <= 1.0f )
 193                                 *pLOffset = (uint8_t)(nColorCount - ( ( nDist / pSpotLight->nLightRadius ) * ( nColorCount - 1 ) ));
 194                         else
 195                                 *pLOffset = 0;
 196
 197                         ++pLOffset;
 198                 }
 199         }
 200
 201         /* Initialize movement variables.       */
 202         pSpotLight->nAccelX = 0;
 203         pSpotLight->nAccelY = 0;
 204         pSpotLight->nVelocityX = ( RANDOM() % 2 ) ? pSpotLight->nVelocityMax : -pSpotLight->nVelocityMax;
 205         pSpotLight->nVelocityY = ( RANDOM() % 2 ) ? pSpotLight->nVelocityMax : -pSpotLight->nVelocityMax;
 206 }
 207
 208
 209 /* Calculates the position of the spot light on the screen. */
 210 static void CalcLightPos( SBumps *pBumps )
 211 {
 212         SSpotLight *pSpotLight = &pBumps->SpotLight;
 213         float nGravity;
 214
 215         /* X */
 216         if( pSpotLight->nXPos < pSpotLight->nFalloffRadius )                                                    nGravity = 1.0f;
 217         else if( pSpotLight->nXPos > pBumps->iWinWidth - pSpotLight->nFalloffRadius )   nGravity = -1.0f;
 218         else                                                                                                                                                    nGravity = ( ( RANDOM() % 201 ) / 100.0f ) - 1.0f;
 219
 220         pSpotLight->nAccelX += nGravity * ( pSpotLight->nAccelMax / 5.0f );
 221         if( pSpotLight->nAccelX < -pSpotLight->nAccelMax )              pSpotLight->nAccelX = -pSpotLight->nAccelMax;
 222         else if( pSpotLight->nAccelX > pSpotLight->nAccelMax )  pSpotLight->nAccelX = pSpotLight->nAccelMax;
 223
 224         pSpotLight->nVelocityX += pSpotLight->nAccelX;
 225         if( pSpotLight->nVelocityX < -pSpotLight->nVelocityMax )                pSpotLight->nVelocityX = -pSpotLight->nVelocityMax;
 226         else if( pSpotLight->nVelocityX > pSpotLight->nVelocityMax )    pSpotLight->nVelocityX = pSpotLight->nVelocityMax;
 227
 228         pSpotLight->nXPos += pSpotLight->nVelocityX;
 229
 230         /* Y */
 231         if( pSpotLight->nYPos < pSpotLight->nFalloffRadius )                                                            nGravity = 1.0f;
 232         else if( pSpotLight->nYPos > pBumps->iWinHeight - pSpotLight->nFalloffRadius )  nGravity = -1.0f;
 233         else                                                                                                                                                    nGravity = ( ( RANDOM() % 201 ) / 100.0f ) - 1.0f;
 234
 235         pSpotLight->nAccelY += nGravity * ( pSpotLight->nAccelMax / 5.0f );
 236         if( pSpotLight->nAccelY < -pSpotLight->nAccelMax )              pSpotLight->nAccelY = -pSpotLight->nAccelMax;
 237         else if( pSpotLight->nAccelY > pSpotLight->nAccelMax )  pSpotLight->nAccelY = pSpotLight->nAccelMax;
 238
 239         pSpotLight->nVelocityY += pSpotLight->nAccelY;
 240         if( pSpotLight->nVelocityY < -pSpotLight->nVelocityMax )                pSpotLight->nVelocityY = -pSpotLight->nVelocityMax;
 241         else if( pSpotLight->nVelocityY > pSpotLight->nVelocityMax )    pSpotLight->nVelocityY = pSpotLight->nVelocityMax;
 242
 243         pSpotLight->nYPos += pSpotLight->nVelocityY;
 244 }
 245
 246
 247 /* Main initialization function. */
 248 static void CreateBumps( SBumps *pBumps, Display *dpy, Window NewWin )
 249 {
 250         XWindowAttributes XWinAttribs;
 251         XGCValues GCValues;
 252         int32_t nGCFlags;
 253         uint16_t iDiameter;
 254
 255         /* Make size and velocity a function of window size, so it appears the same at 100x60 as it does in 3200x1200. */
 256         XGetWindowAttributes( dpy, NewWin, &XWinAttribs );
 257         pBumps->iWinWidth = XWinAttribs.width;
 258         pBumps->iWinHeight = XWinAttribs.height;
 259         pBumps->SpotLight.nXPos = XWinAttribs.width / 2.0f;
 260         pBumps->SpotLight.nYPos = XWinAttribs.height / 2.0f;
 261         pBumps->SpotLight.nVelocityMax = ( ( XWinAttribs.width < XWinAttribs.height ) ? XWinAttribs.width : XWinAttribs.height ) / 140.0f;
 262         pBumps->SpotLight.nAccelMax = pBumps->SpotLight.nVelocityMax / 10.0f;
 263         pBumps->dpy = dpy;
 264         pBumps->Win = NewWin;
 265     pBumps->screen = XWinAttribs.screen;
 266         pBumps->pXImage = NULL;
 267
 268         iDiameter = ( ( pBumps->iWinWidth < pBumps->iWinHeight ) ? pBumps->iWinWidth : pBumps->iWinHeight ) / 2;
 269
 270     /* jwz: sometimes we get tearing if this lands on the wrong bounaary;
 271        constraining it to be a multiple of 8 seems to fix it. */
 272     iDiameter = ((iDiameter+7)/8)*8;
 273
 274 #ifdef HAVE_XSHM_EXTENSION
 275         pBumps->bUseShm = get_boolean_resource(dpy,  "useSHM", "Boolean" );
 276
 277         if( pBumps->bUseShm )
 278         {
 279                 pBumps->pXImage = create_xshm_image( pBumps->dpy, XWinAttribs.visual, XWinAttribs.depth,
 280                                                                                          ZPixmap, NULL, &pBumps->XShmInfo, iDiameter, iDiameter );
 281                 if( !pBumps->pXImage )
 282                 {
 283                         fprintf( stderr, "%s: Unable to create XShmImage.\n", progname );
 284                         pBumps->bUseShm = False;
 285                 }
 286         }
 287 #endif /* HAVE_XSHM_EXTENSION */
 288         if( !pBumps->pXImage )
 289         {
 290                 pBumps->pXImage = XCreateImage( pBumps->dpy, XWinAttribs.visual, XWinAttribs.depth,
 291                                                                         ZPixmap, 0, NULL, iDiameter, iDiameter, BitmapPad( pBumps->dpy ), 0 );
 292                 pBumps->pXImage->data = malloc( pBumps->pXImage->bytes_per_line * pBumps->pXImage->height * sizeof(int8_t) );
 293         }
 294
 295         /* For speed, access the XImage data directly using my own PutPixel routine. */
 296         switch( pBumps->pXImage->bits_per_pixel )
 297         {
 298                 case 32:
 299                         pBumps->bytesPerPixel = 4;
 300                         MyPutPixel = PutPixel32;
 301                         break;
 302
 303                 case 24:
 304                         pBumps->bytesPerPixel = 3;
 305                         MyPutPixel = PutPixel24;
 306                         break;
 307
 308                 case 16:
 309                         pBumps->bytesPerPixel = 2;
 310                         MyPutPixel = PutPixel16;
 311                         break;
 312
 313                 case 8:
 314                         pBumps->bytesPerPixel = 1;
 315                         MyPutPixel = PutPixel8;
 316                         break;
 317
 318                 default:
 319                         fprintf( stderr, "%s: Unknown XImage depth.", progname );
 320 #ifdef HAVE_XSHM_EXTENSION
 321                         if( pBumps->bUseShm )
 322                                 destroy_xshm_image( pBumps->dpy, pBumps->pXImage, &pBumps->XShmInfo );
 323                         else
 324 #endif /* HAVE_XSHM_EXTENSION */
 325                                 XDestroyImage( pBumps->pXImage );
 326                         exit( 1 );
 327         }
 328
 329         GCValues.function = GXcopy;
 330         GCValues.subwindow_mode = IncludeInferiors;
 331         nGCFlags = GCFunction;
 332         if( use_subwindow_mode_p( XWinAttribs.screen, pBumps->Win ) ) /* See grabscreen.c */
 333                 nGCFlags |= GCSubwindowMode;
 334         pBumps->GraphicsContext = XCreateGC( pBumps->dpy, pBumps->Win, nGCFlags, &GCValues );
 335
 336         SetPalette(dpy, pBumps, &XWinAttribs );
 337         CreateSpotLight( &pBumps->SpotLight, iDiameter, pBumps->nColorCount );
 338         InitBumpMap(dpy, pBumps, &XWinAttribs );
 339 }
 340
 341
 342 /* Creates a specialized phong shade palette. */
 343 static void SetPalette(Display *dpy, SBumps *pBumps, XWindowAttributes *pXWinAttribs )
 344 {
 345         XColor BaseColor;
 346         XColor Color;
 347         char *sColor;                   /* Spotlight Color */
 348         int16_t iColor;
 349
 350         sColor = get_string_resource(dpy,  "color", "Color" );
 351
 352         BaseColor.red = RANDOM() % 0xFFFF;
 353         BaseColor.green = RANDOM() % 0xFFFF;
 354         BaseColor.blue = RANDOM() % 0xFFFF;
 355
 356         /* Make one color full intesity to avoid dark spotlights.       */
 357         switch( RANDOM() % 3 )
 358         {
 359                 case 0: BaseColor.red   = 0xFFFF;       break;
 360                 case 1: BaseColor.green = 0xFFFF;       break;
 361                 case 2: BaseColor.blue  = 0xFFFF;       break;
 362         }
 363
 364         if( strcasecmp( sColor, "random" ) && !XParseColor( pBumps->dpy, pXWinAttribs->colormap, sColor, &BaseColor ) )
 365                 fprintf( stderr, "%s: color %s not found in database. Choosing random...\n", progname, sColor );
 366
 367 #ifdef VERBOSE
 368         printf( "%s: Spotlight color is <%d,%d,%d> RGB.\n", progclass, BaseColor.red, BaseColor.green, BaseColor.blue );
 369 #endif  /*  VERBOSE */
 370
 371         pBumps->nColorCount = get_integer_resource(dpy,  "colorcount", "Integer" );
 372         if( pBumps->nColorCount < 2 )   pBumps->nColorCount = 2;
 373         if( pBumps->nColorCount > 128 ) pBumps->nColorCount = 128;
 374
 375         pBumps->aColors = malloc( pBumps->nColorCount * sizeof(unsigned long) );
 376
 377         /* Creates a phong shade:                 / BaseColor  \                               Index/ColorCount
 378          *                                                      PhongShade = | ------------ | Index + ( 65535 - BaseColor )^
 379          *                                                                                \ ColorCount /                                                                                                */
 380         pBumps->nColorCount--;
 381         for( iColor=0; iColor<=pBumps->nColorCount; iColor++ )
 382         {
 383                 Color.red   = (uint16_t)( ( ( BaseColor.red   / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.red,   iColor/(double)pBumps->nColorCount ) );
 384                 Color.green = (uint16_t)( ( ( BaseColor.green / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.green, iColor/(double)pBumps->nColorCount ) );
 385                 Color.blue  = (uint16_t)( ( ( BaseColor.blue  / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.blue,  iColor/(double)pBumps->nColorCount ) );
 386
 387                 if( !XAllocColor( pBumps->dpy, pXWinAttribs->colormap, &Color ) )
 388                 {
 389                         XFreeColors( pBumps->dpy, pXWinAttribs->colormap, pBumps->aColors, iColor, 0 );
 390                         free( pBumps->aColors );
 391                         pBumps->aColors = malloc( pBumps->nColorCount * sizeof(unsigned long) );
 392                         pBumps->nColorCount--;
 393                         iColor = -1;
 394                 }
 395                 else
 396                         pBumps->aColors[ iColor ] = Color.pixel;
 397         }
 398         pBumps->nColorCount++;
 399
 400 #ifdef VERBOSE
 401         printf( "%s: Allocated %d colors.\n", progclass, pBumps->nColorCount );
 402 #endif  /*  VERBOSE */
 403
 404         XSetWindowBackground( pBumps->dpy, pBumps->Win, pBumps->aColors[ 0 ] );
 405 }
 406
 407
 408 /* Grabs the current contents of the window to use an intensity-based bump map. */
 409 static void InitBumpMap(Display *dpy, SBumps *pBumps, XWindowAttributes *pXWinAttribs )
 410 {
 411         pBumps->xColors = (XColor*)malloc( pBumps->iWinWidth * sizeof(XColor) );
 412
 413     if (pBumps->source) abort();
 414     pBumps->source = XCreatePixmap(pBumps->dpy, pBumps->Win,
 415                                    pXWinAttribs->width, pXWinAttribs->height,
 416                                    pXWinAttribs->depth);
 417   pBumps->img_loader = load_image_async_simple (0, pXWinAttribs->screen,
 418                                             pBumps->Win, pBumps->source, 0, 0);
 419 }
 420
 421 static void InitBumpMap_2(Display *dpy, SBumps *pBumps)
 422 {
 423         XImage *pScreenImage;
 424         XColor *pColor;
 425         uint8_t nSoften;
 426         uint16_t iWidth, iHeight;
 427         uint32_t nAverager;
 428         uint16_t        *pBump;
 429         uint16_t maxHeight;
 430         double softenMultiplier = 1.0f;
 431         BOOL bInvert = (BOOL)get_boolean_resource(dpy,  "invert", "Boolean" );
 432     XWindowAttributes XWinAttribs;
 433     XGetWindowAttributes( pBumps->dpy, pBumps->Win, &XWinAttribs );
 434
 435     pBumps->start_time = time ((time_t) 0);
 436
 437         pScreenImage = XGetImage( pBumps->dpy, pBumps->source, 0, 0,
 438                               pBumps->iWinWidth, pBumps->iWinHeight,
 439                               ~0L, ZPixmap );
 440 /*    XFreePixmap (pBumps->dpy, pBumps->source);
 441     pBumps->source = 0;*/
 442
 443         XSetWindowBackground( pBumps->dpy, pBumps->Win, pBumps->aColors[ 0 ] );
 444         XClearWindow (pBumps->dpy, pBumps->Win);
 445         XSync (pBumps->dpy, 0);
 446
 447         pBumps->aBumpMap = malloc( pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 448
 449         nSoften = get_integer_resource(dpy,  "soften", "Integer" );
 450         while( nSoften-- )
 451                 softenMultiplier *= 1.0f + ( 1.0f / 3.0f );     /* Softening takes the max height down, so scale up to compensate. */
 452         maxHeight = pBumps->SpotLight.nLightRadius * softenMultiplier;
 453         nAverager = maxHeight ? ( 3 * 0xFFFF ) / maxHeight : 0;
 454
 455         pBump = pBumps->aBumpMap;
 456         if( bInvert )   /* Funny, it's actually the 'else' that inverts the bump map... */
 457         {
 458                 for( iHeight=0; iHeight<pBumps->iWinHeight; iHeight++ )
 459                 {
 460                         pColor = pBumps->xColors;
 461                         for( iWidth=0; iWidth<pBumps->iWinWidth; iWidth++ )
 462                                 (pColor++)->pixel = XGetPixel( pScreenImage, iWidth, iHeight );
 463
 464                         XQueryColors( pBumps->dpy, XWinAttribs.colormap, pBumps->xColors, pBumps->iWinWidth );
 465
 466                         pColor = pBumps->xColors;
 467                         for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pColor, ++pBump )
 468                           *pBump = ( nAverager ? ( pColor->red + pColor->green + pColor->blue ) / nAverager : 0 );
 469                 }
 470         }
 471         else
 472         {
 473                 for( iHeight=0; iHeight<pBumps->iWinHeight; iHeight++ )
 474                 {
 475                         pColor = pBumps->xColors;
 476                         for( iWidth=0; iWidth<pBumps->iWinWidth; iWidth++ )
 477                                 (pColor++)->pixel = XGetPixel( pScreenImage, iWidth, iHeight );
 478
 479                         XQueryColors( pBumps->dpy, XWinAttribs.colormap, pBumps->xColors, pBumps->iWinWidth );
 480
 481                         pColor = pBumps->xColors;
 482                         for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pColor, ++pBump )
 483                           *pBump = ( maxHeight - ( nAverager ? ( pColor->red + pColor->green + pColor->blue ) / nAverager : 0 ) );
 484                 }
 485         }
 486
 487         XDestroyImage( pScreenImage );
 488
 489         nSoften = get_integer_resource(dpy,  "soften", "Integer" );
 490 #ifdef VERBOSE
 491         if( nSoften )   printf( "%s: Softening Bump Map %d time(s)...\n", progclass, nSoften );
 492 #endif
 493         while( nSoften-- )
 494                 SoftenBumpMap( pBumps );
 495
 496 /*      free( pBumps->xColors );
 497     pBumps->xColors = 0;*/
 498 }
 499
 500 /* Soften the bump map.  This is to avoid pixelated-looking ridges.
 501  * |-----|-----|-----|
 502  * |  0% |12.5%|  0% |  The adjacent pixels are averaged together
 503  * |-----|-----|-----|  first.  Then than value is averaged with
 504  * |12.5%| 50% |12.5%|  the pixel is question. This essentially weights
 505  * |-----|-----|-----|  each pixel as shown on the left.
 506  * |  0% |12.5%|  0% |
 507  * |-----|-----|-----|
 508  */
 509 static void SoftenBumpMap( SBumps *pBumps )
 510 {
 511         uint16_t *pOffset, *pTOffset;
 512         uint32_t nHeight;
 513         uint32_t iWidth, iHeight;
 514         uint16_t *aTempBuffer = malloc( pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 515
 516         pOffset = pBumps->aBumpMap;
 517         pTOffset = aTempBuffer;
 518         for( iHeight=pBumps->iWinHeight; iHeight; --iHeight )
 519         {
 520                 for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pOffset, ++pTOffset )
 521                 {
 522                         if( iHeight==pBumps->iWinHeight || iHeight==1 ||
 523                                 iWidth==pBumps->iWinWidth || iWidth==1 )
 524                         {
 525                                 *pTOffset = 0;
 526                                 continue;
 527                         }
 528
 529                         nHeight = pOffset[ -pBumps->iWinWidth ];
 530                         nHeight += pOffset[ 1 ];
 531                         nHeight += pOffset[ pBumps->iWinWidth ];
 532                         nHeight += pOffset[ -1 ];
 533                         nHeight >>= 2;
 534                         nHeight += pOffset[ 0 ];
 535                         nHeight >>= 1;
 536                         *pTOffset = nHeight;
 537                 }
 538         }
 539
 540         memcpy( pBumps->aBumpMap, aTempBuffer, pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 541         free( aTempBuffer );
 542 }
 543
 544
 545 /* This is where we slap down some pixels... */
 546 static void Execute( SBumps *pBumps )
 547 {
 548         int32_t nLightXPos, nLightYPos;
 549         int32_t iScreenX, iScreenY;
 550         int32_t iLightX, iLightY;
 551         uint16_t *pBOffset;
 552         int8_t *pDOffset;
 553         int32_t nX, nY;
 554         uint16_t nColor;
 555         int32_t nLightOffsetFar = pBumps->SpotLight.nFalloffDiameter - pBumps->SpotLight.nLightRadius;
 556
 557         CalcLightPos( pBumps );
 558
 559         /* Offset to upper left hand corner. */
 560         nLightXPos = pBumps->SpotLight.nXPos - pBumps->SpotLight.nFalloffRadius;
 561         nLightYPos = pBumps->SpotLight.nYPos - pBumps->SpotLight.nFalloffRadius;
 562
 563         for( iScreenY=nLightYPos, iLightY=-pBumps->SpotLight.nLightRadius; iLightY<nLightOffsetFar; ++iScreenY, ++iLightY )
 564         {
 565                 if( iScreenY < 0 )                                                      continue;
 566                 else if( iScreenY >= pBumps->iWinHeight )       break;
 567
 568     /* warning: pointer targets in assignment differ in signedness
 569        Should pDOffset be a int8?  I can't tell.  -jwz, 22-Jul-2003 */
 570                 pDOffset = (int8_t *) &pBumps->pXImage->data[ (iLightY+pBumps->SpotLight.nLightRadius) * pBumps->pXImage->bytes_per_line ];
 571                 pBOffset = pBumps->aBumpMap + ( iScreenY * pBumps->iWinWidth ) + nLightXPos;
 572                 for( iScreenX=nLightXPos, iLightX=-pBumps->SpotLight.nLightRadius; iLightX<nLightOffsetFar; ++iScreenX, ++iLightX, ++pBOffset, pDOffset+=pBumps->bytesPerPixel )
 573                 {
 574                         if( iScreenX < 0 )                                                      continue;
 575                         else if( iScreenX >= pBumps->iWinWidth )        break;
 576                         else if( iScreenY == 0 || iScreenY >= pBumps->iWinHeight-2 ||
 577                                          iScreenX == 0 || iScreenX >= pBumps->iWinWidth-2 )
 578                         {
 579                                 MyPutPixel( pDOffset, pBumps->aColors[ 0 ] );
 580                                 continue;
 581                         }
 582
 583                         /* That's right folks, all the magic of bump mapping occurs in these two lines.  (kinda disappointing, isn't it?) */
 584                         nX = ( pBOffset[ 1 ] - pBOffset[ 0 ] ) + iLightX;
 585                         nY = ( pBOffset[ pBumps->iWinWidth ] - pBOffset[ 0 ] ) + iLightY;
 586
 587                         if( nX<0 || nX>=pBumps->SpotLight.nLightDiameter
 588                          || nY<0 || nY>=pBumps->SpotLight.nLightDiameter )
 589                         {
 590                                 MyPutPixel( pDOffset, pBumps->aColors[ 0 ] );
 591                                 continue;
 592                         }
 593
 594                         nColor = pBumps->SpotLight.aLightMap[ ( nY * pBumps->SpotLight.nLightDiameter ) + nX ];
 595                         MyPutPixel( pDOffset, pBumps->aColors[ nColor ] );
 596                 }
 597         }
 598
 599         /* Allow the spotlight to go *slightly* off the screen by clipping the XImage. */
 600         iLightX = iLightY = 0;  /* Use these for XImages X and Y now.   */
 601         nX = nY = pBumps->SpotLight.nFalloffDiameter;   /* Use these for XImage width and height now.   */
 602         if( nLightXPos < 0 )
 603         {
 604                 iLightX = -nLightXPos;
 605                 nX -= iLightX;
 606                 nLightXPos = 0;
 607         }
 608         else if( nLightXPos + nX >= pBumps->iWinWidth )
 609         {
 610                 nX -= ( nLightXPos + nX ) - pBumps->iWinWidth;
 611         }
 612
 613         if( nLightYPos < 0 )
 614         {
 615                 iLightY = -nLightYPos;
 616                 nY -= iLightY;
 617                 nLightYPos = 0;
 618         }
 619         else if( nLightYPos + nY >= pBumps->iWinHeight )
 620         {
 621                 nY -= ( nLightYPos + nY ) - pBumps->iWinHeight;
 622         }
 623
 624 #ifdef HAVE_XSHM_EXTENSION
 625         if( pBumps->bUseShm )
 626                 XShmPutImage( pBumps->dpy, pBumps->Win, pBumps->GraphicsContext, pBumps->pXImage, iLightX, iLightY, nLightXPos, nLightYPos,
 627                                           nX, nY, False);
 628         else
 629 #endif /* HAVE_XSHM_EXTENSION */
 630                 XPutImage( pBumps->dpy, pBumps->Win, pBumps->GraphicsContext, pBumps->pXImage, iLightX, iLightY, nLightXPos, nLightYPos,
 631                                    nX, nY );
 632 }
 633
 634
 635 static void DestroySpotLight( SSpotLight *pSpotLight ) { free( pSpotLight->aLightMap ); }
 636
 637 /* Clean up */
 638 static void DestroyBumps( SBumps *pBumps )
 639 {
 640         DestroySpotLight( &pBumps->SpotLight );
 641         free( pBumps->aColors );
 642         free( pBumps->aBumpMap );
 643 #ifdef HAVE_XSHM_EXTENSION
 644         if( pBumps->bUseShm )
 645                 destroy_xshm_image( pBumps->dpy, pBumps->pXImage, &pBumps->XShmInfo );
 646         else
 647 #endif /* HAVE_XSHM_EXTENSION */
 648                 XDestroyImage( pBumps->pXImage );
 649 }
 650
 651
 652 /* All messages to the screensaver are processed here. */
 653 static void *
 654 bumps_init (Display *dpy, Window Win)
 655 {
 656         SBumps *Bumps = (SBumps *) calloc (1, sizeof(SBumps));
 657
 658 #ifdef VERBOSE
 659         time_t Time = time( NULL );
 660         uint16_t iFrame = 0;
 661 #endif  /*  VERBOSE */
 662
 663         CreateBumps( Bumps, dpy, Win );
 664         Bumps->delay = get_integer_resource(dpy,  "delay", "Integer" );
 665     Bumps->duration = get_integer_resource (dpy, "duration", "Seconds");
 666     if (Bumps->delay < 0) Bumps->delay = 0;
 667     if (Bumps->duration < 1) Bumps->duration = 1;
 668     Bumps->start_time = time ((time_t) 0);
 669     return Bumps;
 670 }
 671
 672 static unsigned long
 673 bumps_draw (Display *dpy, Window window, void *closure)
 674 {
 675   SBumps *Bumps = (SBumps *) closure;
 676
 677   if (Bumps->img_loader)   /* still loading */
 678     {
 679       Bumps->img_loader = load_image_async_simple (Bumps->img_loader, 0, 0, 0, 0, 0);
 680       if (! Bumps->img_loader)  /* just finished */
 681         InitBumpMap_2(dpy, Bumps);
 682       return Bumps->delay;
 683     }
 684
 685   if (!Bumps->img_loader &&
 686       Bumps->start_time + Bumps->duration < time ((time_t) 0)) {
 687     Bumps->img_loader = load_image_async_simple (0, Bumps->screen,
 688                                                  Bumps->Win, Bumps->source,
 689                                                  0, 0);
 690   }
 691
 692   Execute( Bumps );
 693
 694 #ifdef VERBOSE
 695   iFrame++;
 696   if( Time - time( NULL ) )
 697     {
 698       printf( "FPS: %d\n", iFrame );
 699       Time = time( NULL );
 700       iFrame = 0;
 701     }
 702 #endif  /*  VERBOSE */
 703
 704   return Bumps->delay;
 705 }
 706
 707 static void
 708 bumps_reshape (Display *dpy, Window window, void *closure,
 709                  unsigned int w, unsigned int h)
 710 {
 711 }
 712
 713 static Bool
 714 bumps_event (Display *dpy, Window window, void *closure, XEvent *event)
 715 {
 716   return False;
 717 }
 718
 719 static void
 720 bumps_free (Display *dpy, Window window, void *closure)
 721 {
 722   SBumps *Bumps = (SBumps *) closure;
 723   DestroyBumps( Bumps );
 724 }
 725
 726
 727 XSCREENSAVER_MODULE ("Bumps", bumps)
 728
 729 /* vim: ts=4
 730  */