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  *  [10/01/1999] - Shane Smit: Creation
  24  *  [10/08/1999] - Shane Smit: Port to C. (Ick)
  25  *  [03/08/2002] - Shane Smit: New movement code.
  26  *  [09/12/2002] - Shane Smit: MIT-SHM XImages.
  27  *                             Thanks to Kennett Galbraith <http://www.Alpha-II.com/>
  28  *                             for code optimization.
  29  *  [10/09/2016] - Dave Odell: Updated for new xshm.c.
  30  *                             Y2K compliance.
  31  */
  32
  33
  34 #include <math.h>
  35 #include <time.h>
  36 #include <inttypes.h>
  37 #include "screenhack.h"
  38 #include "xshm.h"
  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 HAVE_MOBILE
  67   "*ignoreRotation: True",
  68   "*rotateImages:   True",
  69 #endif
  70   0
  71 };
  72
  73 static XrmOptionDescRec bumps_options [] = {
  74   { "-color",           ".color",               XrmoptionSepArg, 0 },
  75   { "-colorcount",      ".colorcount",  XrmoptionSepArg, 0 },
  76   { "-duration",        ".duration",    XrmoptionSepArg, 0 },
  77   { "-delay",           ".delay",               XrmoptionSepArg, 0 },
  78   { "-soften",          ".soften",              XrmoptionSepArg, 0 },
  79   { "-invert",          ".invert",              XrmoptionNoArg, "TRUE" },
  80 #ifdef HAVE_XSHM_EXTENSION
  81   { "-shm",                     ".useSHM",              XrmoptionNoArg, "True" },
  82   { "-no-shm",          ".useSHM",              XrmoptionNoArg, "False" },
  83 #endif /* HAVE_XSHM_EXTENSION */
  84
  85   { 0, 0, 0, 0 }
  86 };
  87
  88
  89 /* This structure handles everything to do with the spotlight, and is designed to be
  90  * a member of TBumps. */
  91 typedef struct
  92 {
  93         uint8_t *aLightMap;
  94         uint16_t nFalloffDiameter, nFalloffRadius;
  95         uint16_t nLightDiameter, nLightRadius;
  96         float nAccelX, nAccelY;
  97         float nAccelMax;
  98         float nVelocityX, nVelocityY;
  99         float nVelocityMax;
 100         float nXPos, nYPos;
 101 } SSpotLight;
 102
 103
 104 /* The entire program's operation is contained within this structure. */
 105 typedef struct
 106 {
 107         /* XWindows specific variables. */
 108         Display *dpy;
 109         Window Win;
 110         Screen *screen;
 111         Pixmap source;
 112         GC GraphicsContext;
 113         XColor *xColors;
 114         unsigned long *aColors;
 115         XImage *pXImage;
 116         XShmSegmentInfo XShmInfo;
 117
 118         uint8_t nColorCount;                            /* Number of colors used. */
 119         uint8_t bytesPerPixel;
 120         uint16_t iWinWidth, iWinHeight;
 121         uint16_t *aBumpMap;                             /* The actual bump map. */
 122         SSpotLight SpotLight;
 123
 124         int delay;
 125         int duration;
 126         time_t start_time;
 127
 128         async_load_state *img_loader;
 129 } SBumps;
 130
 131
 132 static void SetPalette(Display *, SBumps *, XWindowAttributes * );
 133 static void InitBumpMap(Display *, SBumps *, XWindowAttributes * );
 134 static void InitBumpMap_2(Display *, SBumps *);
 135 static void SoftenBumpMap( SBumps * );
 136
 137
 138
 139
 140 /* This function pointer will point to the appropriate PutPixel*() function below. */
 141 static void (*MyPutPixel)( int8_t *, uint32_t );
 142
 143 static void PutPixel32( int8_t *pData, uint32_t pixel )
 144 {
 145         *(uint32_t *)pData = pixel;
 146 }
 147
 148 static void PutPixel24( int8_t *pData, uint32_t pixel )
 149 {
 150         pData[ 2 ] = ( pixel & 0x00FF0000 ) >> 16;
 151         pData[ 1 ] = ( pixel & 0x0000FF00 ) >> 8;
 152         pData[ 0 ] = ( pixel & 0x000000FF );
 153 }
 154
 155 static void PutPixel16( int8_t *pData, uint32_t pixel )
 156 {
 157         *(uint16_t *)pData = (uint16_t)pixel;
 158 }
 159
 160 static void PutPixel8( int8_t *pData, uint32_t pixel )
 161 {
 162         *(uint8_t *)pData = (uint8_t)pixel;
 163 }
 164
 165 /* Creates the light map, which is a circular image... going from black around the edges
 166  * to white in the center. */
 167 static void CreateSpotLight( SSpotLight *pSpotLight, uint16_t iDiameter, uint16_t nColorCount )
 168 {
 169         double nDist;
 170         int16_t iDistX, iDistY;
 171         uint8_t *pLOffset;
 172
 173         pSpotLight->nFalloffDiameter = iDiameter;
 174         pSpotLight->nFalloffRadius = pSpotLight->nFalloffDiameter / 2;
 175         pSpotLight->nLightDiameter = iDiameter / 2;
 176         pSpotLight->nLightRadius = pSpotLight->nLightDiameter / 2;
 177 #ifdef VERBOSE
 178         printf( "%s: Falloff Diameter: %d\n", progclass, pSpotLight->nFalloffDiameter );
 179         printf( "%s: Spot Light Diameter: %d\n", progclass, pSpotLight->nLightDiameter );
 180 #endif
 181
 182         pSpotLight->aLightMap = malloc( pSpotLight->nLightDiameter * pSpotLight->nLightDiameter * sizeof(uint8_t) );
 183
 184         pLOffset = pSpotLight->aLightMap;
 185         for( iDistY=-pSpotLight->nLightRadius; iDistY<pSpotLight->nLightRadius; ++iDistY )
 186         {
 187                 for( iDistX=-pSpotLight->nLightRadius; iDistX<pSpotLight->nLightRadius; ++iDistX )
 188                 {
 189                         nDist = sqrt( pow( iDistX+0.5F, 2 ) + pow( iDistY+0.5F, 2 ) );
 190                         if( nDist / pSpotLight->nLightRadius <= 1.0f )
 191                                 *pLOffset = (uint8_t)(nColorCount - ( ( nDist / pSpotLight->nLightRadius ) * ( nColorCount - 1 ) ));
 192                         else
 193                                 *pLOffset = 0;
 194
 195                         ++pLOffset;
 196                 }
 197         }
 198
 199         /* Initialize movement variables.       */
 200         pSpotLight->nAccelX = 0;
 201         pSpotLight->nAccelY = 0;
 202         pSpotLight->nVelocityX = ( RANDOM() % 2 ) ? pSpotLight->nVelocityMax : -pSpotLight->nVelocityMax;
 203         pSpotLight->nVelocityY = ( RANDOM() % 2 ) ? pSpotLight->nVelocityMax : -pSpotLight->nVelocityMax;
 204 }
 205
 206
 207 /* Calculates the position of the spot light on the screen. */
 208 static void CalcLightPos( SBumps *pBumps )
 209 {
 210         SSpotLight *pSpotLight = &pBumps->SpotLight;
 211         float nGravity;
 212
 213         /* X */
 214         if( pSpotLight->nXPos < pSpotLight->nFalloffRadius )                                                    nGravity = 1.0f;
 215         else if( pSpotLight->nXPos > pBumps->iWinWidth - pSpotLight->nFalloffRadius )   nGravity = -1.0f;
 216         else                                                                                                                                                    nGravity = ( ( RANDOM() % 201 ) / 100.0f ) - 1.0f;
 217
 218         pSpotLight->nAccelX += nGravity * ( pSpotLight->nAccelMax / 5.0f );
 219         if( pSpotLight->nAccelX < -pSpotLight->nAccelMax )              pSpotLight->nAccelX = -pSpotLight->nAccelMax;
 220         else if( pSpotLight->nAccelX > pSpotLight->nAccelMax )  pSpotLight->nAccelX = pSpotLight->nAccelMax;
 221
 222         pSpotLight->nVelocityX += pSpotLight->nAccelX;
 223         if( pSpotLight->nVelocityX < -pSpotLight->nVelocityMax )                pSpotLight->nVelocityX = -pSpotLight->nVelocityMax;
 224         else if( pSpotLight->nVelocityX > pSpotLight->nVelocityMax )    pSpotLight->nVelocityX = pSpotLight->nVelocityMax;
 225
 226         pSpotLight->nXPos += pSpotLight->nVelocityX;
 227
 228         /* Y */
 229         if( pSpotLight->nYPos < pSpotLight->nFalloffRadius )                                                            nGravity = 1.0f;
 230         else if( pSpotLight->nYPos > pBumps->iWinHeight - pSpotLight->nFalloffRadius )  nGravity = -1.0f;
 231         else                                                                                                                                                    nGravity = ( ( RANDOM() % 201 ) / 100.0f ) - 1.0f;
 232
 233         pSpotLight->nAccelY += nGravity * ( pSpotLight->nAccelMax / 5.0f );
 234         if( pSpotLight->nAccelY < -pSpotLight->nAccelMax )              pSpotLight->nAccelY = -pSpotLight->nAccelMax;
 235         else if( pSpotLight->nAccelY > pSpotLight->nAccelMax )  pSpotLight->nAccelY = pSpotLight->nAccelMax;
 236
 237         pSpotLight->nVelocityY += pSpotLight->nAccelY;
 238         if( pSpotLight->nVelocityY < -pSpotLight->nVelocityMax )                pSpotLight->nVelocityY = -pSpotLight->nVelocityMax;
 239         else if( pSpotLight->nVelocityY > pSpotLight->nVelocityMax )    pSpotLight->nVelocityY = pSpotLight->nVelocityMax;
 240
 241         pSpotLight->nYPos += pSpotLight->nVelocityY;
 242 }
 243
 244
 245 /* Main initialization function. */
 246 static void CreateBumps( SBumps *pBumps, Display *dpy, Window NewWin )
 247 {
 248         XWindowAttributes XWinAttribs;
 249         XGCValues GCValues;
 250         int32_t nGCFlags;
 251         uint16_t iDiameter;
 252
 253         /* Make size and velocity a function of window size, so it appears the same at 100x60 as it does in 3200x1200. */
 254         XGetWindowAttributes( dpy, NewWin, &XWinAttribs );
 255         pBumps->iWinWidth = XWinAttribs.width;
 256         pBumps->iWinHeight = XWinAttribs.height;
 257         pBumps->SpotLight.nXPos = XWinAttribs.width / 2.0f;
 258         pBumps->SpotLight.nYPos = XWinAttribs.height / 2.0f;
 259         pBumps->SpotLight.nVelocityMax = ( ( XWinAttribs.width < XWinAttribs.height ) ? XWinAttribs.width : XWinAttribs.height ) / 140.0f;
 260         pBumps->SpotLight.nAccelMax = pBumps->SpotLight.nVelocityMax / 10.0f;
 261         pBumps->dpy = dpy;
 262         pBumps->Win = NewWin;
 263     pBumps->screen = XWinAttribs.screen;
 264
 265         iDiameter = ( ( pBumps->iWinWidth < pBumps->iWinHeight ) ? pBumps->iWinWidth : pBumps->iWinHeight ) / 2;
 266
 267     /* jwz: sometimes we get tearing if this lands on the wrong bounaary;
 268        constraining it to be a multiple of 8 seems to fix it. */
 269     iDiameter = ((iDiameter+7)/8)*8;
 270
 271         pBumps->pXImage = create_xshm_image( pBumps->dpy, XWinAttribs.visual, XWinAttribs.depth,
 272                                              ZPixmap, &pBumps->XShmInfo, iDiameter, iDiameter );
 273
 274         /* For speed, access the XImage data directly using my own PutPixel routine. */
 275         switch( pBumps->pXImage->bits_per_pixel )
 276         {
 277                 case 32:
 278                         pBumps->bytesPerPixel = 4;
 279                         MyPutPixel = PutPixel32;
 280                         break;
 281
 282                 case 24:
 283                         pBumps->bytesPerPixel = 3;
 284                         MyPutPixel = PutPixel24;
 285                         break;
 286
 287                 case 16:
 288                         pBumps->bytesPerPixel = 2;
 289                         MyPutPixel = PutPixel16;
 290                         break;
 291
 292                 case 8:
 293                         pBumps->bytesPerPixel = 1;
 294                         MyPutPixel = PutPixel8;
 295                         break;
 296
 297                 default:
 298                         fprintf( stderr, "%s: Unknown XImage depth.", progname );
 299                         destroy_xshm_image( pBumps->dpy, pBumps->pXImage, &pBumps->XShmInfo );
 300                         exit( 1 );
 301         }
 302
 303         GCValues.function = GXcopy;
 304         GCValues.subwindow_mode = IncludeInferiors;
 305         nGCFlags = GCFunction;
 306         if( use_subwindow_mode_p( XWinAttribs.screen, pBumps->Win ) ) /* See grabscreen.c */
 307                 nGCFlags |= GCSubwindowMode;
 308         pBumps->GraphicsContext = XCreateGC( pBumps->dpy, pBumps->Win, nGCFlags, &GCValues );
 309
 310         SetPalette(dpy, pBumps, &XWinAttribs );
 311         CreateSpotLight( &pBumps->SpotLight, iDiameter, pBumps->nColorCount );
 312         InitBumpMap(dpy, pBumps, &XWinAttribs );
 313 }
 314
 315
 316 /* Creates a specialized phong shade palette. */
 317 static void SetPalette(Display *dpy, SBumps *pBumps, XWindowAttributes *pXWinAttribs )
 318 {
 319         XColor BaseColor;
 320         XColor Color;
 321         char *sColor;                   /* Spotlight Color */
 322         int16_t iColor;
 323
 324         sColor = get_string_resource(dpy,  "color", "Color" );
 325
 326         BaseColor.red = RANDOM() % 0xFFFF;
 327         BaseColor.green = RANDOM() % 0xFFFF;
 328         BaseColor.blue = RANDOM() % 0xFFFF;
 329
 330         /* Make one color full intesity to avoid dark spotlights.       */
 331         switch( RANDOM() % 3 )
 332         {
 333                 case 0: BaseColor.red   = 0xFFFF;       break;
 334                 case 1: BaseColor.green = 0xFFFF;       break;
 335                 case 2: BaseColor.blue  = 0xFFFF;       break;
 336         }
 337
 338         if( strcasecmp( sColor, "random" ) && !XParseColor( pBumps->dpy, pXWinAttribs->colormap, sColor, &BaseColor ) )
 339                 fprintf( stderr, "%s: color %s not found in database. Choosing random...\n", progname, sColor );
 340
 341 #ifdef VERBOSE
 342         printf( "%s: Spotlight color is <%d,%d,%d> RGB.\n", progclass, BaseColor.red, BaseColor.green, BaseColor.blue );
 343 #endif  /*  VERBOSE */
 344
 345         pBumps->nColorCount = get_integer_resource(dpy,  "colorcount", "Integer" );
 346         if( pBumps->nColorCount < 2 )   pBumps->nColorCount = 2;
 347         if( pBumps->nColorCount > 128 ) pBumps->nColorCount = 128;
 348
 349         pBumps->aColors = malloc( pBumps->nColorCount * sizeof(unsigned long) );
 350
 351         /* Creates a phong shade:                 / BaseColor  \                               Index/ColorCount
 352          *                                                      PhongShade = | ------------ | Index + ( 65535 - BaseColor )^
 353          *                                                                                \ ColorCount /                                                                                                */
 354         pBumps->nColorCount--;
 355         for( iColor=0; iColor<=pBumps->nColorCount; iColor++ )
 356         {
 357                 Color.red   = (uint16_t)( ( ( BaseColor.red   / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.red,   iColor/(double)pBumps->nColorCount ) );
 358                 Color.green = (uint16_t)( ( ( BaseColor.green / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.green, iColor/(double)pBumps->nColorCount ) );
 359                 Color.blue  = (uint16_t)( ( ( BaseColor.blue  / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.blue,  iColor/(double)pBumps->nColorCount ) );
 360
 361                 if( !XAllocColor( pBumps->dpy, pXWinAttribs->colormap, &Color ) )
 362                 {
 363                         XFreeColors( pBumps->dpy, pXWinAttribs->colormap, pBumps->aColors, iColor, 0 );
 364                         free( pBumps->aColors );
 365                         pBumps->aColors = malloc( pBumps->nColorCount * sizeof(unsigned long) );
 366                         pBumps->nColorCount--;
 367                         iColor = -1;
 368                 }
 369                 else
 370                         pBumps->aColors[ iColor ] = Color.pixel;
 371         }
 372         pBumps->nColorCount++;
 373
 374 #ifdef VERBOSE
 375         printf( "%s: Allocated %d colors.\n", progclass, pBumps->nColorCount );
 376 #endif  /*  VERBOSE */
 377
 378         XSetWindowBackground( pBumps->dpy, pBumps->Win, pBumps->aColors[ 0 ] );
 379 }
 380
 381
 382 /* Grabs the current contents of the window to use an intensity-based bump map. */
 383 static void InitBumpMap(Display *dpy, SBumps *pBumps, XWindowAttributes *pXWinAttribs )
 384 {
 385         pBumps->xColors = (XColor*)malloc( pBumps->iWinWidth * sizeof(XColor) );
 386
 387     if (pBumps->source) abort();
 388     pBumps->source = XCreatePixmap(pBumps->dpy, pBumps->Win,
 389                                    pXWinAttribs->width, pXWinAttribs->height,
 390                                    pXWinAttribs->depth);
 391   pBumps->img_loader = load_image_async_simple (0, pXWinAttribs->screen,
 392                                             pBumps->Win, pBumps->source, 0, 0);
 393 }
 394
 395 static void InitBumpMap_2(Display *dpy, SBumps *pBumps)
 396 {
 397         XImage *pScreenImage;
 398         XColor *pColor;
 399         uint8_t nSoften;
 400         uint16_t iWidth, iHeight;
 401         uint32_t nAverager;
 402         uint16_t        *pBump;
 403         uint16_t maxHeight;
 404         double softenMultiplier = 1.0f;
 405         BOOL bInvert = (BOOL)get_boolean_resource(dpy,  "invert", "Boolean" );
 406     XWindowAttributes XWinAttribs;
 407     XGetWindowAttributes( pBumps->dpy, pBumps->Win, &XWinAttribs );
 408
 409     pBumps->start_time = time ((time_t *) 0);
 410
 411         pScreenImage = XGetImage( pBumps->dpy, pBumps->source, 0, 0,
 412                               pBumps->iWinWidth, pBumps->iWinHeight,
 413                               ~0L, ZPixmap );
 414 /*    XFreePixmap (pBumps->dpy, pBumps->source);
 415     pBumps->source = 0;*/
 416
 417         XSetWindowBackground( pBumps->dpy, pBumps->Win, pBumps->aColors[ 0 ] );
 418         XClearWindow (pBumps->dpy, pBumps->Win);
 419         XSync (pBumps->dpy, 0);
 420
 421         pBumps->aBumpMap = malloc( pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 422
 423         nSoften = get_integer_resource(dpy,  "soften", "Integer" );
 424         while( nSoften-- )
 425                 softenMultiplier *= 1.0f + ( 1.0f / 3.0f );     /* Softening takes the max height down, so scale up to compensate. */
 426         maxHeight = pBumps->SpotLight.nLightRadius * softenMultiplier;
 427         nAverager = maxHeight ? ( 3 * 0xFFFF ) / maxHeight : 0;
 428
 429         pBump = pBumps->aBumpMap;
 430         if( bInvert )   /* Funny, it's actually the 'else' that inverts the bump map... */
 431         {
 432                 for( iHeight=0; iHeight<pBumps->iWinHeight; iHeight++ )
 433                 {
 434                         pColor = pBumps->xColors;
 435                         for( iWidth=0; iWidth<pBumps->iWinWidth; iWidth++ )
 436                                 (pColor++)->pixel = XGetPixel( pScreenImage, iWidth, iHeight );
 437
 438                         XQueryColors( pBumps->dpy, XWinAttribs.colormap, pBumps->xColors, pBumps->iWinWidth );
 439
 440                         pColor = pBumps->xColors;
 441                         for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pColor, ++pBump )
 442                           *pBump = ( nAverager ? ( pColor->red + pColor->green + pColor->blue ) / nAverager : 0 );
 443                 }
 444         }
 445         else
 446         {
 447                 for( iHeight=0; iHeight<pBumps->iWinHeight; iHeight++ )
 448                 {
 449                         pColor = pBumps->xColors;
 450                         for( iWidth=0; iWidth<pBumps->iWinWidth; iWidth++ )
 451                                 (pColor++)->pixel = XGetPixel( pScreenImage, iWidth, iHeight );
 452
 453                         XQueryColors( pBumps->dpy, XWinAttribs.colormap, pBumps->xColors, pBumps->iWinWidth );
 454
 455                         pColor = pBumps->xColors;
 456                         for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pColor, ++pBump )
 457                           *pBump = ( maxHeight - ( nAverager ? ( pColor->red + pColor->green + pColor->blue ) / nAverager : 0 ) );
 458                 }
 459         }
 460
 461         XDestroyImage( pScreenImage );
 462
 463         nSoften = get_integer_resource(dpy,  "soften", "Integer" );
 464 #ifdef VERBOSE
 465         if( nSoften )   printf( "%s: Softening Bump Map %d time(s)...\n", progclass, nSoften );
 466 #endif
 467         while( nSoften-- )
 468                 SoftenBumpMap( pBumps );
 469
 470 /*      free( pBumps->xColors );
 471     pBumps->xColors = 0;*/
 472 }
 473
 474 /* Soften the bump map.  This is to avoid pixelated-looking ridges.
 475  * |-----|-----|-----|
 476  * |  0% |12.5%|  0% |  The adjacent pixels are averaged together
 477  * |-----|-----|-----|  first.  Then than value is averaged with
 478  * |12.5%| 50% |12.5%|  the pixel is question. This essentially weights
 479  * |-----|-----|-----|  each pixel as shown on the left.
 480  * |  0% |12.5%|  0% |
 481  * |-----|-----|-----|
 482  */
 483 static void SoftenBumpMap( SBumps *pBumps )
 484 {
 485         uint16_t *pOffset, *pTOffset;
 486         uint32_t nHeight;
 487         uint32_t iWidth, iHeight;
 488         uint16_t *aTempBuffer = malloc( pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 489
 490         pOffset = pBumps->aBumpMap;
 491         pTOffset = aTempBuffer;
 492         for( iHeight=pBumps->iWinHeight; iHeight; --iHeight )
 493         {
 494                 for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pOffset, ++pTOffset )
 495                 {
 496                         if( iHeight==pBumps->iWinHeight || iHeight==1 ||
 497                                 iWidth==pBumps->iWinWidth || iWidth==1 )
 498                         {
 499                                 *pTOffset = 0;
 500                                 continue;
 501                         }
 502
 503                         nHeight = pOffset[ -pBumps->iWinWidth ];
 504                         nHeight += pOffset[ 1 ];
 505                         nHeight += pOffset[ pBumps->iWinWidth ];
 506                         nHeight += pOffset[ -1 ];
 507                         nHeight >>= 2;
 508                         nHeight += pOffset[ 0 ];
 509                         nHeight >>= 1;
 510                         *pTOffset = nHeight;
 511                 }
 512         }
 513
 514         memcpy( pBumps->aBumpMap, aTempBuffer, pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 515         free( aTempBuffer );
 516 }
 517
 518
 519 /* This is where we slap down some pixels... */
 520 static void Execute( SBumps *pBumps )
 521 {
 522         int32_t nLightXPos, nLightYPos;
 523         int32_t iScreenX, iScreenY;
 524         int32_t iLightX, iLightY;
 525         uint16_t *pBOffset;
 526         int8_t *pDOffset;
 527         int32_t nX, nY;
 528         uint16_t nColor;
 529         int32_t nLightOffsetFar = pBumps->SpotLight.nFalloffDiameter - pBumps->SpotLight.nLightRadius;
 530
 531         CalcLightPos( pBumps );
 532
 533         /* Offset to upper left hand corner. */
 534         nLightXPos = pBumps->SpotLight.nXPos - pBumps->SpotLight.nFalloffRadius;
 535         nLightYPos = pBumps->SpotLight.nYPos - pBumps->SpotLight.nFalloffRadius;
 536
 537         for( iScreenY=nLightYPos, iLightY=-pBumps->SpotLight.nLightRadius; iLightY<nLightOffsetFar; ++iScreenY, ++iLightY )
 538         {
 539                 if( iScreenY < 0 )                                                      continue;
 540                 else if( iScreenY >= pBumps->iWinHeight )       break;
 541
 542     /* warning: pointer targets in assignment differ in signedness
 543        Should pDOffset be a int8?  I can't tell.  -jwz, 22-Jul-2003 */
 544                 pDOffset = (int8_t *) &pBumps->pXImage->data[ (iLightY+pBumps->SpotLight.nLightRadius) * pBumps->pXImage->bytes_per_line ];
 545                 pBOffset = pBumps->aBumpMap + ( iScreenY * pBumps->iWinWidth ) + nLightXPos;
 546                 for( iScreenX=nLightXPos, iLightX=-pBumps->SpotLight.nLightRadius; iLightX<nLightOffsetFar; ++iScreenX, ++iLightX, ++pBOffset, pDOffset+=pBumps->bytesPerPixel )
 547                 {
 548                         if( iScreenX < 0 )                                                      continue;
 549                         else if( iScreenX >= pBumps->iWinWidth )        break;
 550                         else if( iScreenY == 0 || iScreenY >= pBumps->iWinHeight-2 ||
 551                                          iScreenX == 0 || iScreenX >= pBumps->iWinWidth-2 )
 552                         {
 553                                 MyPutPixel( pDOffset, pBumps->aColors[ 0 ] );
 554                                 continue;
 555                         }
 556
 557                         /* That's right folks, all the magic of bump mapping occurs in these two lines.  (kinda disappointing, isn't it?) */
 558                         nX = ( pBOffset[ 1 ] - pBOffset[ 0 ] ) + iLightX;
 559                         nY = ( pBOffset[ pBumps->iWinWidth ] - pBOffset[ 0 ] ) + iLightY;
 560
 561                         if( nX<0 || nX>=pBumps->SpotLight.nLightDiameter
 562                          || nY<0 || nY>=pBumps->SpotLight.nLightDiameter )
 563                         {
 564                                 MyPutPixel( pDOffset, pBumps->aColors[ 0 ] );
 565                                 continue;
 566                         }
 567
 568                         nColor = pBumps->SpotLight.aLightMap[ ( nY * pBumps->SpotLight.nLightDiameter ) + nX ];
 569                         MyPutPixel( pDOffset, pBumps->aColors[ nColor ] );
 570                 }
 571         }
 572
 573         /* Allow the spotlight to go *slightly* off the screen by clipping the XImage. */
 574         iLightX = iLightY = 0;  /* Use these for XImages X and Y now.   */
 575         nX = nY = pBumps->SpotLight.nFalloffDiameter;   /* Use these for XImage width and height now.   */
 576         if( nLightXPos < 0 )
 577         {
 578                 iLightX = -nLightXPos;
 579                 nX -= iLightX;
 580                 nLightXPos = 0;
 581         }
 582         else if( nLightXPos + nX >= pBumps->iWinWidth )
 583         {
 584                 nX -= ( nLightXPos + nX ) - pBumps->iWinWidth;
 585         }
 586
 587         if( nLightYPos < 0 )
 588         {
 589                 iLightY = -nLightYPos;
 590                 nY -= iLightY;
 591                 nLightYPos = 0;
 592         }
 593         else if( nLightYPos + nY >= pBumps->iWinHeight )
 594         {
 595                 nY -= ( nLightYPos + nY ) - pBumps->iWinHeight;
 596         }
 597
 598         put_xshm_image( pBumps->dpy, pBumps->Win, pBumps->GraphicsContext, pBumps->pXImage, iLightX, iLightY, nLightXPos, nLightYPos,
 599                         nX, nY, &pBumps->XShmInfo);
 600 }
 601
 602
 603 static void DestroySpotLight( SSpotLight *pSpotLight ) { free( pSpotLight->aLightMap ); }
 604
 605 /* Clean up */
 606 static void DestroyBumps( SBumps *pBumps )
 607 {
 608         DestroySpotLight( &pBumps->SpotLight );
 609         free( pBumps->aColors );
 610         free( pBumps->aBumpMap );
 611         destroy_xshm_image( pBumps->dpy, pBumps->pXImage, &pBumps->XShmInfo );
 612 }
 613
 614
 615 /* All messages to the screensaver are processed here. */
 616 static void *
 617 bumps_init (Display *dpy, Window Win)
 618 {
 619         SBumps *Bumps = (SBumps *) calloc (1, sizeof(SBumps));
 620
 621 #ifdef VERBOSE
 622         time_t Time = time( NULL );
 623         uint16_t iFrame = 0;
 624 #endif  /*  VERBOSE */
 625
 626         CreateBumps( Bumps, dpy, Win );
 627         Bumps->delay = get_integer_resource(dpy,  "delay", "Integer" );
 628     Bumps->duration = get_integer_resource (dpy, "duration", "Seconds");
 629     if (Bumps->delay < 0) Bumps->delay = 0;
 630     if (Bumps->duration < 1) Bumps->duration = 1;
 631     Bumps->start_time = time ((time_t *) 0);
 632     return Bumps;
 633 }
 634
 635 static unsigned long
 636 bumps_draw (Display *dpy, Window window, void *closure)
 637 {
 638   SBumps *Bumps = (SBumps *) closure;
 639
 640   if (Bumps->img_loader)   /* still loading */
 641     {
 642       Bumps->img_loader = load_image_async_simple (Bumps->img_loader, 0, 0, 0, 0, 0);
 643       if (! Bumps->img_loader)  /* just finished */
 644         InitBumpMap_2(dpy, Bumps);
 645       return Bumps->delay;
 646     }
 647
 648   if (!Bumps->img_loader &&
 649       Bumps->start_time + Bumps->duration < time ((time_t *) 0)) {
 650     Bumps->img_loader = load_image_async_simple (0, Bumps->screen,
 651                                                  Bumps->Win, Bumps->source,
 652                                                  0, 0);
 653   }
 654
 655   Execute( Bumps );
 656
 657 #ifdef VERBOSE
 658   iFrame++;
 659   if( Time - time( NULL ) )
 660     {
 661       printf( "FPS: %d\n", iFrame );
 662       Time = time( NULL );
 663       iFrame = 0;
 664     }
 665 #endif  /*  VERBOSE */
 666
 667   return Bumps->delay;
 668 }
 669
 670 static void
 671 bumps_reshape (Display *dpy, Window window, void *closure,
 672                  unsigned int w, unsigned int h)
 673 {
 674 }
 675
 676 static Bool
 677 bumps_event (Display *dpy, Window window, void *closure, XEvent *event)
 678 {
 679   SBumps *Bumps = (SBumps *) closure;
 680   if (screenhack_event_helper (dpy, window, event))
 681     {
 682       Bumps->start_time = 0;
 683       return True;
 684     }
 685
 686   return False;
 687 }
 688
 689 static void
 690 bumps_free (Display *dpy, Window window, void *closure)
 691 {
 692   SBumps *Bumps = (SBumps *) closure;
 693   DestroyBumps( Bumps );
 694 }
 695
 696
 697 XSCREENSAVER_MODULE ("Bumps", bumps)
 698
 699 /* vim: ts=4
 700  */