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   "*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 #ifdef HAVE_XSHM_EXTENSION
 117         XShmSegmentInfo XShmInfo;
 118         Bool    bUseShm;
 119 #endif /* HAVE_XSHM_EXTENSION */
 120
 121         uint8_t nColorCount;                            /* Number of colors used. */
 122         uint8_t bytesPerPixel;
 123         uint16_t iWinWidth, iWinHeight;
 124         uint16_t *aBumpMap;                             /* The actual bump map. */
 125         SSpotLight SpotLight;
 126
 127         int delay;
 128         int duration;
 129         time_t start_time;
 130
 131         async_load_state *img_loader;
 132 } SBumps;
 133
 134
 135 static void SetPalette(Display *, SBumps *, XWindowAttributes * );
 136 static void InitBumpMap(Display *, SBumps *, XWindowAttributes * );
 137 static void InitBumpMap_2(Display *, SBumps *);
 138 static void SoftenBumpMap( SBumps * );
 139
 140
 141
 142
 143 /* This function pointer will point to the appropriate PutPixel*() function below. */
 144 static void (*MyPutPixel)( int8_t *, uint32_t );
 145
 146 static void PutPixel32( int8_t *pData, uint32_t pixel )
 147 {
 148         *(uint32_t *)pData = pixel;
 149 }
 150
 151 static void PutPixel24( int8_t *pData, uint32_t pixel )
 152 {
 153         pData[ 2 ] = ( pixel & 0x00FF0000 ) >> 16;
 154         pData[ 1 ] = ( pixel & 0x0000FF00 ) >> 8;
 155         pData[ 0 ] = ( pixel & 0x000000FF );
 156 }
 157
 158 static void PutPixel16( int8_t *pData, uint32_t pixel )
 159 {
 160         *(uint16_t *)pData = (uint16_t)pixel;
 161 }
 162
 163 static void PutPixel8( int8_t *pData, uint32_t pixel )
 164 {
 165         *(uint8_t *)pData = (uint8_t)pixel;
 166 }
 167
 168 /* Creates the light map, which is a circular image... going from black around the edges
 169  * to white in the center. */
 170 static void CreateSpotLight( SSpotLight *pSpotLight, uint16_t iDiameter, uint16_t nColorCount )
 171 {
 172         double nDist;
 173         int16_t iDistX, iDistY;
 174         uint8_t *pLOffset;
 175
 176         pSpotLight->nFalloffDiameter = iDiameter;
 177         pSpotLight->nFalloffRadius = pSpotLight->nFalloffDiameter / 2;
 178         pSpotLight->nLightDiameter = iDiameter / 2;
 179         pSpotLight->nLightRadius = pSpotLight->nLightDiameter / 2;
 180 #ifdef VERBOSE
 181         printf( "%s: Falloff Diameter: %d\n", progclass, pSpotLight->nFalloffDiameter );
 182         printf( "%s: Spot Light Diameter: %d\n", progclass, pSpotLight->nLightDiameter );
 183 #endif
 184
 185         pSpotLight->aLightMap = malloc( pSpotLight->nLightDiameter * pSpotLight->nLightDiameter * sizeof(uint8_t) );
 186
 187         pLOffset = pSpotLight->aLightMap;
 188         for( iDistY=-pSpotLight->nLightRadius; iDistY<pSpotLight->nLightRadius; ++iDistY )
 189         {
 190                 for( iDistX=-pSpotLight->nLightRadius; iDistX<pSpotLight->nLightRadius; ++iDistX )
 191                 {
 192                         nDist = sqrt( pow( iDistX+0.5F, 2 ) + pow( iDistY+0.5F, 2 ) );
 193                         if( nDist / pSpotLight->nLightRadius <= 1.0f )
 194                                 *pLOffset = (uint8_t)(nColorCount - ( ( nDist / pSpotLight->nLightRadius ) * ( nColorCount - 1 ) ));
 195                         else
 196                                 *pLOffset = 0;
 197
 198                         ++pLOffset;
 199                 }
 200         }
 201
 202         /* Initialize movement variables.       */
 203         pSpotLight->nAccelX = 0;
 204         pSpotLight->nAccelY = 0;
 205         pSpotLight->nVelocityX = ( RANDOM() % 2 ) ? pSpotLight->nVelocityMax : -pSpotLight->nVelocityMax;
 206         pSpotLight->nVelocityY = ( RANDOM() % 2 ) ? pSpotLight->nVelocityMax : -pSpotLight->nVelocityMax;
 207 }
 208
 209
 210 /* Calculates the position of the spot light on the screen. */
 211 static void CalcLightPos( SBumps *pBumps )
 212 {
 213         SSpotLight *pSpotLight = &pBumps->SpotLight;
 214         float nGravity;
 215
 216         /* X */
 217         if( pSpotLight->nXPos < pSpotLight->nFalloffRadius )                                                    nGravity = 1.0f;
 218         else if( pSpotLight->nXPos > pBumps->iWinWidth - pSpotLight->nFalloffRadius )   nGravity = -1.0f;
 219         else                                                                                                                                                    nGravity = ( ( RANDOM() % 201 ) / 100.0f ) - 1.0f;
 220
 221         pSpotLight->nAccelX += nGravity * ( pSpotLight->nAccelMax / 5.0f );
 222         if( pSpotLight->nAccelX < -pSpotLight->nAccelMax )              pSpotLight->nAccelX = -pSpotLight->nAccelMax;
 223         else if( pSpotLight->nAccelX > pSpotLight->nAccelMax )  pSpotLight->nAccelX = pSpotLight->nAccelMax;
 224
 225         pSpotLight->nVelocityX += pSpotLight->nAccelX;
 226         if( pSpotLight->nVelocityX < -pSpotLight->nVelocityMax )                pSpotLight->nVelocityX = -pSpotLight->nVelocityMax;
 227         else if( pSpotLight->nVelocityX > pSpotLight->nVelocityMax )    pSpotLight->nVelocityX = pSpotLight->nVelocityMax;
 228
 229         pSpotLight->nXPos += pSpotLight->nVelocityX;
 230
 231         /* Y */
 232         if( pSpotLight->nYPos < pSpotLight->nFalloffRadius )                                                            nGravity = 1.0f;
 233         else if( pSpotLight->nYPos > pBumps->iWinHeight - pSpotLight->nFalloffRadius )  nGravity = -1.0f;
 234         else                                                                                                                                                    nGravity = ( ( RANDOM() % 201 ) / 100.0f ) - 1.0f;
 235
 236         pSpotLight->nAccelY += nGravity * ( pSpotLight->nAccelMax / 5.0f );
 237         if( pSpotLight->nAccelY < -pSpotLight->nAccelMax )              pSpotLight->nAccelY = -pSpotLight->nAccelMax;
 238         else if( pSpotLight->nAccelY > pSpotLight->nAccelMax )  pSpotLight->nAccelY = pSpotLight->nAccelMax;
 239
 240         pSpotLight->nVelocityY += pSpotLight->nAccelY;
 241         if( pSpotLight->nVelocityY < -pSpotLight->nVelocityMax )                pSpotLight->nVelocityY = -pSpotLight->nVelocityMax;
 242         else if( pSpotLight->nVelocityY > pSpotLight->nVelocityMax )    pSpotLight->nVelocityY = pSpotLight->nVelocityMax;
 243
 244         pSpotLight->nYPos += pSpotLight->nVelocityY;
 245 }
 246
 247
 248 /* Main initialization function. */
 249 static void CreateBumps( SBumps *pBumps, Display *dpy, Window NewWin )
 250 {
 251         XWindowAttributes XWinAttribs;
 252         XGCValues GCValues;
 253         int32_t nGCFlags;
 254         uint16_t iDiameter;
 255
 256         /* Make size and velocity a function of window size, so it appears the same at 100x60 as it does in 3200x1200. */
 257         XGetWindowAttributes( dpy, NewWin, &XWinAttribs );
 258         pBumps->iWinWidth = XWinAttribs.width;
 259         pBumps->iWinHeight = XWinAttribs.height;
 260         pBumps->SpotLight.nXPos = XWinAttribs.width / 2.0f;
 261         pBumps->SpotLight.nYPos = XWinAttribs.height / 2.0f;
 262         pBumps->SpotLight.nVelocityMax = ( ( XWinAttribs.width < XWinAttribs.height ) ? XWinAttribs.width : XWinAttribs.height ) / 140.0f;
 263         pBumps->SpotLight.nAccelMax = pBumps->SpotLight.nVelocityMax / 10.0f;
 264         pBumps->dpy = dpy;
 265         pBumps->Win = NewWin;
 266     pBumps->screen = XWinAttribs.screen;
 267         pBumps->pXImage = NULL;
 268
 269         iDiameter = ( ( pBumps->iWinWidth < pBumps->iWinHeight ) ? pBumps->iWinWidth : pBumps->iWinHeight ) / 2;
 270
 271     /* jwz: sometimes we get tearing if this lands on the wrong bounaary;
 272        constraining it to be a multiple of 8 seems to fix it. */
 273     iDiameter = ((iDiameter+7)/8)*8;
 274
 275 #ifdef HAVE_XSHM_EXTENSION
 276         pBumps->bUseShm = get_boolean_resource(dpy,  "useSHM", "Boolean" );
 277
 278         if( pBumps->bUseShm )
 279         {
 280                 pBumps->pXImage = create_xshm_image( pBumps->dpy, XWinAttribs.visual, XWinAttribs.depth,
 281                                                                                          ZPixmap, NULL, &pBumps->XShmInfo, iDiameter, iDiameter );
 282                 if( !pBumps->pXImage )
 283                 {
 284                         fprintf( stderr, "%s: Unable to create XShmImage.\n", progname );
 285                         pBumps->bUseShm = False;
 286                 }
 287         }
 288 #endif /* HAVE_XSHM_EXTENSION */
 289         if( !pBumps->pXImage )
 290         {
 291                 pBumps->pXImage = XCreateImage( pBumps->dpy, XWinAttribs.visual, XWinAttribs.depth,
 292                                                                         ZPixmap, 0, NULL, iDiameter, iDiameter, BitmapPad( pBumps->dpy ), 0 );
 293                 pBumps->pXImage->data = malloc( pBumps->pXImage->bytes_per_line * pBumps->pXImage->height * sizeof(int8_t) );
 294         }
 295
 296         /* For speed, access the XImage data directly using my own PutPixel routine. */
 297         switch( pBumps->pXImage->bits_per_pixel )
 298         {
 299                 case 32:
 300                         pBumps->bytesPerPixel = 4;
 301                         MyPutPixel = PutPixel32;
 302                         break;
 303
 304                 case 24:
 305                         pBumps->bytesPerPixel = 3;
 306                         MyPutPixel = PutPixel24;
 307                         break;
 308
 309                 case 16:
 310                         pBumps->bytesPerPixel = 2;
 311                         MyPutPixel = PutPixel16;
 312                         break;
 313
 314                 case 8:
 315                         pBumps->bytesPerPixel = 1;
 316                         MyPutPixel = PutPixel8;
 317                         break;
 318
 319                 default:
 320                         fprintf( stderr, "%s: Unknown XImage depth.", progname );
 321 #ifdef HAVE_XSHM_EXTENSION
 322                         if( pBumps->bUseShm )
 323                                 destroy_xshm_image( pBumps->dpy, pBumps->pXImage, &pBumps->XShmInfo );
 324                         else
 325 #endif /* HAVE_XSHM_EXTENSION */
 326                                 XDestroyImage( pBumps->pXImage );
 327                         exit( 1 );
 328         }
 329
 330         GCValues.function = GXcopy;
 331         GCValues.subwindow_mode = IncludeInferiors;
 332         nGCFlags = GCFunction;
 333         if( use_subwindow_mode_p( XWinAttribs.screen, pBumps->Win ) ) /* See grabscreen.c */
 334                 nGCFlags |= GCSubwindowMode;
 335         pBumps->GraphicsContext = XCreateGC( pBumps->dpy, pBumps->Win, nGCFlags, &GCValues );
 336
 337         SetPalette(dpy, pBumps, &XWinAttribs );
 338         CreateSpotLight( &pBumps->SpotLight, iDiameter, pBumps->nColorCount );
 339         InitBumpMap(dpy, pBumps, &XWinAttribs );
 340 }
 341
 342
 343 /* Creates a specialized phong shade palette. */
 344 static void SetPalette(Display *dpy, SBumps *pBumps, XWindowAttributes *pXWinAttribs )
 345 {
 346         XColor BaseColor;
 347         XColor Color;
 348         char *sColor;                   /* Spotlight Color */
 349         int16_t iColor;
 350
 351         sColor = get_string_resource(dpy,  "color", "Color" );
 352
 353         BaseColor.red = RANDOM() % 0xFFFF;
 354         BaseColor.green = RANDOM() % 0xFFFF;
 355         BaseColor.blue = RANDOM() % 0xFFFF;
 356
 357         /* Make one color full intesity to avoid dark spotlights.       */
 358         switch( RANDOM() % 3 )
 359         {
 360                 case 0: BaseColor.red   = 0xFFFF;       break;
 361                 case 1: BaseColor.green = 0xFFFF;       break;
 362                 case 2: BaseColor.blue  = 0xFFFF;       break;
 363         }
 364
 365         if( strcasecmp( sColor, "random" ) && !XParseColor( pBumps->dpy, pXWinAttribs->colormap, sColor, &BaseColor ) )
 366                 fprintf( stderr, "%s: color %s not found in database. Choosing random...\n", progname, sColor );
 367
 368 #ifdef VERBOSE
 369         printf( "%s: Spotlight color is <%d,%d,%d> RGB.\n", progclass, BaseColor.red, BaseColor.green, BaseColor.blue );
 370 #endif  /*  VERBOSE */
 371
 372         pBumps->nColorCount = get_integer_resource(dpy,  "colorcount", "Integer" );
 373         if( pBumps->nColorCount < 2 )   pBumps->nColorCount = 2;
 374         if( pBumps->nColorCount > 128 ) pBumps->nColorCount = 128;
 375
 376         pBumps->aColors = malloc( pBumps->nColorCount * sizeof(unsigned long) );
 377
 378         /* Creates a phong shade:                 / BaseColor  \                               Index/ColorCount
 379          *                                                      PhongShade = | ------------ | Index + ( 65535 - BaseColor )^
 380          *                                                                                \ ColorCount /                                                                                                */
 381         pBumps->nColorCount--;
 382         for( iColor=0; iColor<=pBumps->nColorCount; iColor++ )
 383         {
 384                 Color.red   = (uint16_t)( ( ( BaseColor.red   / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.red,   iColor/(double)pBumps->nColorCount ) );
 385                 Color.green = (uint16_t)( ( ( BaseColor.green / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.green, iColor/(double)pBumps->nColorCount ) );
 386                 Color.blue  = (uint16_t)( ( ( BaseColor.blue  / (double)pBumps->nColorCount ) * iColor ) + pow( 0xFFFF - BaseColor.blue,  iColor/(double)pBumps->nColorCount ) );
 387
 388                 if( !XAllocColor( pBumps->dpy, pXWinAttribs->colormap, &Color ) )
 389                 {
 390                         XFreeColors( pBumps->dpy, pXWinAttribs->colormap, pBumps->aColors, iColor, 0 );
 391                         free( pBumps->aColors );
 392                         pBumps->aColors = malloc( pBumps->nColorCount * sizeof(unsigned long) );
 393                         pBumps->nColorCount--;
 394                         iColor = -1;
 395                 }
 396                 else
 397                         pBumps->aColors[ iColor ] = Color.pixel;
 398         }
 399         pBumps->nColorCount++;
 400
 401 #ifdef VERBOSE
 402         printf( "%s: Allocated %d colors.\n", progclass, pBumps->nColorCount );
 403 #endif  /*  VERBOSE */
 404
 405         XSetWindowBackground( pBumps->dpy, pBumps->Win, pBumps->aColors[ 0 ] );
 406 }
 407
 408
 409 /* Grabs the current contents of the window to use an intensity-based bump map. */
 410 static void InitBumpMap(Display *dpy, SBumps *pBumps, XWindowAttributes *pXWinAttribs )
 411 {
 412         pBumps->xColors = (XColor*)malloc( pBumps->iWinWidth * sizeof(XColor) );
 413
 414     if (pBumps->source) abort();
 415     pBumps->source = XCreatePixmap(pBumps->dpy, pBumps->Win,
 416                                    pXWinAttribs->width, pXWinAttribs->height,
 417                                    pXWinAttribs->depth);
 418   pBumps->img_loader = load_image_async_simple (0, pXWinAttribs->screen,
 419                                             pBumps->Win, pBumps->source, 0, 0);
 420 }
 421
 422 static void InitBumpMap_2(Display *dpy, SBumps *pBumps)
 423 {
 424         XImage *pScreenImage;
 425         XColor *pColor;
 426         uint8_t nSoften;
 427         uint16_t iWidth, iHeight;
 428         uint32_t nAverager;
 429         uint16_t        *pBump;
 430         uint16_t maxHeight;
 431         double softenMultiplier = 1.0f;
 432         BOOL bInvert = (BOOL)get_boolean_resource(dpy,  "invert", "Boolean" );
 433     XWindowAttributes XWinAttribs;
 434     XGetWindowAttributes( pBumps->dpy, pBumps->Win, &XWinAttribs );
 435
 436     pBumps->start_time = time ((time_t) 0);
 437
 438         pScreenImage = XGetImage( pBumps->dpy, pBumps->source, 0, 0,
 439                               pBumps->iWinWidth, pBumps->iWinHeight,
 440                               ~0L, ZPixmap );
 441 /*    XFreePixmap (pBumps->dpy, pBumps->source);
 442     pBumps->source = 0;*/
 443
 444         XSetWindowBackground( pBumps->dpy, pBumps->Win, pBumps->aColors[ 0 ] );
 445         XClearWindow (pBumps->dpy, pBumps->Win);
 446         XSync (pBumps->dpy, 0);
 447
 448         pBumps->aBumpMap = malloc( pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 449
 450         nSoften = get_integer_resource(dpy,  "soften", "Integer" );
 451         while( nSoften-- )
 452                 softenMultiplier *= 1.0f + ( 1.0f / 3.0f );     /* Softening takes the max height down, so scale up to compensate. */
 453         maxHeight = pBumps->SpotLight.nLightRadius * softenMultiplier;
 454         nAverager = maxHeight ? ( 3 * 0xFFFF ) / maxHeight : 0;
 455
 456         pBump = pBumps->aBumpMap;
 457         if( bInvert )   /* Funny, it's actually the 'else' that inverts the bump map... */
 458         {
 459                 for( iHeight=0; iHeight<pBumps->iWinHeight; iHeight++ )
 460                 {
 461                         pColor = pBumps->xColors;
 462                         for( iWidth=0; iWidth<pBumps->iWinWidth; iWidth++ )
 463                                 (pColor++)->pixel = XGetPixel( pScreenImage, iWidth, iHeight );
 464
 465                         XQueryColors( pBumps->dpy, XWinAttribs.colormap, pBumps->xColors, pBumps->iWinWidth );
 466
 467                         pColor = pBumps->xColors;
 468                         for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pColor, ++pBump )
 469                           *pBump = ( nAverager ? ( pColor->red + pColor->green + pColor->blue ) / nAverager : 0 );
 470                 }
 471         }
 472         else
 473         {
 474                 for( iHeight=0; iHeight<pBumps->iWinHeight; iHeight++ )
 475                 {
 476                         pColor = pBumps->xColors;
 477                         for( iWidth=0; iWidth<pBumps->iWinWidth; iWidth++ )
 478                                 (pColor++)->pixel = XGetPixel( pScreenImage, iWidth, iHeight );
 479
 480                         XQueryColors( pBumps->dpy, XWinAttribs.colormap, pBumps->xColors, pBumps->iWinWidth );
 481
 482                         pColor = pBumps->xColors;
 483                         for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pColor, ++pBump )
 484                           *pBump = ( maxHeight - ( nAverager ? ( pColor->red + pColor->green + pColor->blue ) / nAverager : 0 ) );
 485                 }
 486         }
 487
 488         XDestroyImage( pScreenImage );
 489
 490         nSoften = get_integer_resource(dpy,  "soften", "Integer" );
 491 #ifdef VERBOSE
 492         if( nSoften )   printf( "%s: Softening Bump Map %d time(s)...\n", progclass, nSoften );
 493 #endif
 494         while( nSoften-- )
 495                 SoftenBumpMap( pBumps );
 496
 497 /*      free( pBumps->xColors );
 498     pBumps->xColors = 0;*/
 499 }
 500
 501 /* Soften the bump map.  This is to avoid pixelated-looking ridges.
 502  * |-----|-----|-----|
 503  * |  0% |12.5%|  0% |  The adjacent pixels are averaged together
 504  * |-----|-----|-----|  first.  Then than value is averaged with
 505  * |12.5%| 50% |12.5%|  the pixel is question. This essentially weights
 506  * |-----|-----|-----|  each pixel as shown on the left.
 507  * |  0% |12.5%|  0% |
 508  * |-----|-----|-----|
 509  */
 510 static void SoftenBumpMap( SBumps *pBumps )
 511 {
 512         uint16_t *pOffset, *pTOffset;
 513         uint32_t nHeight;
 514         uint32_t iWidth, iHeight;
 515         uint16_t *aTempBuffer = malloc( pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 516
 517         pOffset = pBumps->aBumpMap;
 518         pTOffset = aTempBuffer;
 519         for( iHeight=pBumps->iWinHeight; iHeight; --iHeight )
 520         {
 521                 for( iWidth=pBumps->iWinWidth; iWidth; --iWidth, ++pOffset, ++pTOffset )
 522                 {
 523                         if( iHeight==pBumps->iWinHeight || iHeight==1 ||
 524                                 iWidth==pBumps->iWinWidth || iWidth==1 )
 525                         {
 526                                 *pTOffset = 0;
 527                                 continue;
 528                         }
 529
 530                         nHeight = pOffset[ -pBumps->iWinWidth ];
 531                         nHeight += pOffset[ 1 ];
 532                         nHeight += pOffset[ pBumps->iWinWidth ];
 533                         nHeight += pOffset[ -1 ];
 534                         nHeight >>= 2;
 535                         nHeight += pOffset[ 0 ];
 536                         nHeight >>= 1;
 537                         *pTOffset = nHeight;
 538                 }
 539         }
 540
 541         memcpy( pBumps->aBumpMap, aTempBuffer, pBumps->iWinWidth * pBumps->iWinHeight * sizeof(uint16_t) );
 542         free( aTempBuffer );
 543 }
 544
 545
 546 /* This is where we slap down some pixels... */
 547 static void Execute( SBumps *pBumps )
 548 {
 549         int32_t nLightXPos, nLightYPos;
 550         int32_t iScreenX, iScreenY;
 551         int32_t iLightX, iLightY;
 552         uint16_t *pBOffset;
 553         int8_t *pDOffset;
 554         int32_t nX, nY;
 555         uint16_t nColor;
 556         int32_t nLightOffsetFar = pBumps->SpotLight.nFalloffDiameter - pBumps->SpotLight.nLightRadius;
 557
 558         CalcLightPos( pBumps );
 559
 560         /* Offset to upper left hand corner. */
 561         nLightXPos = pBumps->SpotLight.nXPos - pBumps->SpotLight.nFalloffRadius;
 562         nLightYPos = pBumps->SpotLight.nYPos - pBumps->SpotLight.nFalloffRadius;
 563
 564         for( iScreenY=nLightYPos, iLightY=-pBumps->SpotLight.nLightRadius; iLightY<nLightOffsetFar; ++iScreenY, ++iLightY )
 565         {
 566                 if( iScreenY < 0 )                                                      continue;
 567                 else if( iScreenY >= pBumps->iWinHeight )       break;
 568
 569     /* warning: pointer targets in assignment differ in signedness
 570        Should pDOffset be a int8?  I can't tell.  -jwz, 22-Jul-2003 */
 571                 pDOffset = (int8_t *) &pBumps->pXImage->data[ (iLightY+pBumps->SpotLight.nLightRadius) * pBumps->pXImage->bytes_per_line ];
 572                 pBOffset = pBumps->aBumpMap + ( iScreenY * pBumps->iWinWidth ) + nLightXPos;
 573                 for( iScreenX=nLightXPos, iLightX=-pBumps->SpotLight.nLightRadius; iLightX<nLightOffsetFar; ++iScreenX, ++iLightX, ++pBOffset, pDOffset+=pBumps->bytesPerPixel )
 574                 {
 575                         if( iScreenX < 0 )                                                      continue;
 576                         else if( iScreenX >= pBumps->iWinWidth )        break;
 577                         else if( iScreenY == 0 || iScreenY >= pBumps->iWinHeight-2 ||
 578                                          iScreenX == 0 || iScreenX >= pBumps->iWinWidth-2 )
 579                         {
 580                                 MyPutPixel( pDOffset, pBumps->aColors[ 0 ] );
 581                                 continue;
 582                         }
 583
 584                         /* That's right folks, all the magic of bump mapping occurs in these two lines.  (kinda disappointing, isn't it?) */
 585                         nX = ( pBOffset[ 1 ] - pBOffset[ 0 ] ) + iLightX;
 586                         nY = ( pBOffset[ pBumps->iWinWidth ] - pBOffset[ 0 ] ) + iLightY;
 587
 588                         if( nX<0 || nX>=pBumps->SpotLight.nLightDiameter
 589                          || nY<0 || nY>=pBumps->SpotLight.nLightDiameter )
 590                         {
 591                                 MyPutPixel( pDOffset, pBumps->aColors[ 0 ] );
 592                                 continue;
 593                         }
 594
 595                         nColor = pBumps->SpotLight.aLightMap[ ( nY * pBumps->SpotLight.nLightDiameter ) + nX ];
 596                         MyPutPixel( pDOffset, pBumps->aColors[ nColor ] );
 597                 }
 598         }
 599
 600         /* Allow the spotlight to go *slightly* off the screen by clipping the XImage. */
 601         iLightX = iLightY = 0;  /* Use these for XImages X and Y now.   */
 602         nX = nY = pBumps->SpotLight.nFalloffDiameter;   /* Use these for XImage width and height now.   */
 603         if( nLightXPos < 0 )
 604         {
 605                 iLightX = -nLightXPos;
 606                 nX -= iLightX;
 607                 nLightXPos = 0;
 608         }
 609         else if( nLightXPos + nX >= pBumps->iWinWidth )
 610         {
 611                 nX -= ( nLightXPos + nX ) - pBumps->iWinWidth;
 612         }
 613
 614         if( nLightYPos < 0 )
 615         {
 616                 iLightY = -nLightYPos;
 617                 nY -= iLightY;
 618                 nLightYPos = 0;
 619         }
 620         else if( nLightYPos + nY >= pBumps->iWinHeight )
 621         {
 622                 nY -= ( nLightYPos + nY ) - pBumps->iWinHeight;
 623         }
 624
 625 #ifdef HAVE_XSHM_EXTENSION
 626         if( pBumps->bUseShm )
 627                 XShmPutImage( pBumps->dpy, pBumps->Win, pBumps->GraphicsContext, pBumps->pXImage, iLightX, iLightY, nLightXPos, nLightYPos,
 628                                           nX, nY, False);
 629         else
 630 #endif /* HAVE_XSHM_EXTENSION */
 631                 XPutImage( pBumps->dpy, pBumps->Win, pBumps->GraphicsContext, pBumps->pXImage, iLightX, iLightY, nLightXPos, nLightYPos,
 632                                    nX, nY );
 633 }
 634
 635
 636 static void DestroySpotLight( SSpotLight *pSpotLight ) { free( pSpotLight->aLightMap ); }
 637
 638 /* Clean up */
 639 static void DestroyBumps( SBumps *pBumps )
 640 {
 641         DestroySpotLight( &pBumps->SpotLight );
 642         free( pBumps->aColors );
 643         free( pBumps->aBumpMap );
 644 #ifdef HAVE_XSHM_EXTENSION
 645         if( pBumps->bUseShm )
 646                 destroy_xshm_image( pBumps->dpy, pBumps->pXImage, &pBumps->XShmInfo );
 647         else
 648 #endif /* HAVE_XSHM_EXTENSION */
 649                 XDestroyImage( pBumps->pXImage );
 650 }
 651
 652
 653 /* All messages to the screensaver are processed here. */
 654 static void *
 655 bumps_init (Display *dpy, Window Win)
 656 {
 657         SBumps *Bumps = (SBumps *) calloc (1, sizeof(SBumps));
 658
 659 #ifdef VERBOSE
 660         time_t Time = time( NULL );
 661         uint16_t iFrame = 0;
 662 #endif  /*  VERBOSE */
 663
 664         CreateBumps( Bumps, dpy, Win );
 665         Bumps->delay = get_integer_resource(dpy,  "delay", "Integer" );
 666     Bumps->duration = get_integer_resource (dpy, "duration", "Seconds");
 667     if (Bumps->delay < 0) Bumps->delay = 0;
 668     if (Bumps->duration < 1) Bumps->duration = 1;
 669     Bumps->start_time = time ((time_t) 0);
 670     return Bumps;
 671 }
 672
 673 static unsigned long
 674 bumps_draw (Display *dpy, Window window, void *closure)
 675 {
 676   SBumps *Bumps = (SBumps *) closure;
 677
 678   if (Bumps->img_loader)   /* still loading */
 679     {
 680       Bumps->img_loader = load_image_async_simple (Bumps->img_loader, 0, 0, 0, 0, 0);
 681       if (! Bumps->img_loader)  /* just finished */
 682         InitBumpMap_2(dpy, Bumps);
 683       return Bumps->delay;
 684     }
 685
 686   if (!Bumps->img_loader &&
 687       Bumps->start_time + Bumps->duration < time ((time_t) 0)) {
 688     Bumps->img_loader = load_image_async_simple (0, Bumps->screen,
 689                                                  Bumps->Win, Bumps->source,
 690                                                  0, 0);
 691   }
 692
 693   Execute( Bumps );
 694
 695 #ifdef VERBOSE
 696   iFrame++;
 697   if( Time - time( NULL ) )
 698     {
 699       printf( "FPS: %d\n", iFrame );
 700       Time = time( NULL );
 701       iFrame = 0;
 702     }
 703 #endif  /*  VERBOSE */
 704
 705   return Bumps->delay;
 706 }
 707
 708 static void
 709 bumps_reshape (Display *dpy, Window window, void *closure,
 710                  unsigned int w, unsigned int h)
 711 {
 712 }
 713
 714 static Bool
 715 bumps_event (Display *dpy, Window window, void *closure, XEvent *event)
 716 {
 717   SBumps *Bumps = (SBumps *) closure;
 718   if (screenhack_event_helper (dpy, window, event))
 719     {
 720       Bumps->start_time = 0;
 721       return True;
 722     }
 723
 724   return False;
 725 }
 726
 727 static void
 728 bumps_free (Display *dpy, Window window, void *closure)
 729 {
 730   SBumps *Bumps = (SBumps *) closure;
 731   DestroyBumps( Bumps );
 732 }
 733
 734
 735 XSCREENSAVER_MODULE ("Bumps", bumps)
 736
 737 /* vim: ts=4
 738  */