src/nsimage.m

   1 /* Image support for the NeXT/Open/GNUstep and MacOSX window system.
   2    Copyright (C) 1989, 1992-1994, 2005-2006, 2008-2011
   3      Free Software Foundation, Inc.
   4
   5 This file is part of GNU Emacs.
   6
   7 GNU Emacs is free software: you can redistribute it and/or modify
   8 it under the terms of the GNU General Public License as published by
   9 the Free Software Foundation, either version 3 of the License, or
  10 (at your option) any later version.
  11
  12 GNU Emacs is distributed in the hope that it will be useful,
  13 but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  15 GNU General Public License for more details.
  16
  17 You should have received a copy of the GNU General Public License
  18 along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */
  19
  20 /*
  21 Originally by Carl Edman
  22 Updated by Christian Limpach (chris@nice.ch)
  23 OpenStep/Rhapsody port by Scott Bender (sbender@harmony-ds.com)
  24 MacOSX/Aqua port by Christophe de Dinechin (descubes@earthlink.net)
  25 GNUstep port and post-20 update by Adrian Robert (arobert@cogsci.ucsd.edu)
  26 */
  27
  28 /* This should be the first include, as it may set up #defines affecting
  29    interpretation of even the system includes. */
  30 #include <config.h>
  31 #include <setjmp.h>
  32
  33 #include "lisp.h"
  34 #include "dispextern.h"
  35 #include "nsterm.h"
  36 #include "frame.h"
  37
  38 extern Lisp_Object QCfile, QCdata;
  39
  40 /* call tracing */
  41 #if 0
  42 int image_trace_num = 0;
  43 #define NSTRACE(x)        fprintf (stderr, "%s:%d: [%d] " #x "\n",         \
  44                                 __FILE__, __LINE__, ++image_trace_num)
  45 #else
  46 #define NSTRACE(x)
  47 #endif
  48
  49
  50 /* ==========================================================================
  51
  52    C interface.  This allows easy calling from C files.  We could just
  53    compile everything as Objective-C, but that might mean slower
  54    compilation and possible difficulties on some platforms..
  55
  56    ========================================================================== */
  57
  58 void *
  59 ns_image_from_XBM (unsigned char *bits, int width, int height)
  60 {
  61   NSTRACE (ns_image_from_XBM);
  62   return [[EmacsImage alloc] initFromXBM: bits
  63                                    width: width height: height
  64                                     flip: YES];
  65 }
  66
  67 void *
  68 ns_image_for_XPM (int width, int height, int depth)
  69 {
  70   NSTRACE (ns_image_for_XPM);
  71   return [[EmacsImage alloc] initForXPMWithDepth: depth
  72                                            width: width height: height];
  73 }
  74
  75 void *
  76 ns_image_from_file (Lisp_Object file)
  77 {
  78   NSTRACE (ns_image_from_bitmap_file);
  79   return [EmacsImage allocInitFromFile: file];
  80 }
  81
  82 int
  83 ns_load_image (struct frame *f, struct image *img,
  84                Lisp_Object spec_file, Lisp_Object spec_data)
  85 {
  86   EmacsImage *eImg = nil;
  87   NSSize size;
  88
  89   NSTRACE (ns_load_image);
  90
  91   if (STRINGP (spec_file))
  92     {
  93       eImg = [EmacsImage allocInitFromFile: spec_file];
  94     }
  95   else if (STRINGP (spec_data))
  96     {
  97       NSData *data;
  98
  99       data = [NSData dataWithBytes: SDATA (spec_data)
 100                             length: SBYTES (spec_data)];
 101       eImg = [[EmacsImage alloc] initWithData: data];
 102       [eImg setPixmapData];
 103     }
 104
 105   if (eImg == nil)
 106     {
 107       add_to_log ("Unable to load image %s", img->spec, Qnil);
 108       return 0;
 109     }
 110
 111   size = [eImg size];
 112   img->width = size.width;
 113   img->height = size.height;
 114
 115   /* 4) set img->pixmap = emacsimage */
 116   img->pixmap = eImg;
 117   return 1;
 118 }
 119
 120
 121 int
 122 ns_image_width (void *img)
 123 {
 124   return [(id)img size].width;
 125 }
 126
 127 int
 128 ns_image_height (void *img)
 129 {
 130   return [(id)img size].height;
 131 }
 132
 133 unsigned long
 134 ns_get_pixel (void *img, int x, int y)
 135 {
 136   return [(EmacsImage *)img getPixelAtX: x Y: y];
 137 }
 138
 139 void
 140 ns_put_pixel (void *img, int x, int y, unsigned long argb)
 141 {
 142   unsigned char alpha = (argb >> 24) & 0xFF;
 143   if (alpha == 0)
 144     alpha = 0xFF;
 145   [(EmacsImage *)img setPixelAtX: x Y: y toRed: (argb >> 16) & 0xFF
 146    green: (argb >> 8) & 0xFF blue: (argb & 0xFF) alpha: alpha];
 147 }
 148
 149 void
 150 ns_set_alpha (void *img, int x, int y, unsigned char a)
 151 {
 152   [(EmacsImage *)img setAlphaAtX: x Y: y to: a];
 153 }
 154
 155
 156 /* ==========================================================================
 157
 158    Class supporting bitmaps and images of various sorts.
 159
 160    ========================================================================== */
 161
 162 @implementation EmacsImage
 163
 164 static EmacsImage *ImageList = nil;
 165
 166 + allocInitFromFile: (Lisp_Object)file
 167 {
 168   EmacsImage *image = ImageList;
 169   NSImageRep *imgRep;
 170   Lisp_Object found;
 171
 172   /* look for an existing image of the same name */
 173   while (image != nil &&
 174          [[image name] compare: [NSString stringWithUTF8String: SDATA (file)]]
 175              != NSOrderedSame)
 176     image = [image imageListNext];
 177
 178   if (image != nil)
 179     {
 180       [image reference];
 181       return image;
 182     }
 183
 184   /* Search bitmap-file-path for the file, if appropriate.  */
 185   found = x_find_image_file (file);
 186   if (!STRINGP (found))
 187     return nil;
 188
 189   image = [[EmacsImage alloc] initByReferencingFile:
 190                      [NSString stringWithUTF8String: SDATA (found)]];
 191
 192   imgRep = [image bestRepresentationForDevice: nil];
 193   if (imgRep == nil)
 194     {
 195       [image release];
 196       return nil;
 197     }
 198
 199   /* The next two lines cause the DPI of the image to be ignored.
 200      This seems to be the behavior users expect. */
 201   [image setScalesWhenResized: YES];
 202   [image setSize: NSMakeSize([imgRep pixelsWide], [imgRep pixelsHigh])];
 203
 204   [image setName: [NSString stringWithUTF8String: SDATA (file)]];
 205   [image reference];
 206   ImageList = [image imageListSetNext: ImageList];
 207
 208   return image;
 209 }
 210
 211
 212 - reference
 213 {
 214   refCount++;
 215   return self;
 216 }
 217
 218
 219 - imageListSetNext: (id)arg
 220 {
 221   imageListNext = arg;
 222   return self;
 223 }
 224
 225
 226 - imageListNext
 227 {
 228   return imageListNext;
 229 }
 230
 231
 232 - (void)dealloc
 233 {
 234   id list = ImageList;
 235
 236   if (refCount > 1)
 237     {
 238       refCount--;
 239       return;
 240     }
 241
 242   [stippleMask release];
 243
 244   if (list == self)
 245     ImageList = imageListNext;
 246   else
 247     {
 248       while (list != nil && [list imageListNext] != self)
 249         list = [list imageListNext];
 250       [list imageListSetNext: imageListNext];
 251     }
 252
 253   [super dealloc];
 254 }
 255
 256
 257 - initFromXBM: (unsigned char *)bits width: (int)w height: (int)h
 258          flip: (BOOL)flip
 259 {
 260   return [self initFromSkipXBM: bits width: w height: h flip: flip length: 0];
 261 }
 262
 263
 264 - initFromSkipXBM: (unsigned char *)bits width: (int)w height: (int)h
 265              flip: (BOOL)flip length: (int)length;
 266 {
 267   int bpr = (w + 7) / 8;
 268   unsigned char *planes[5];
 269
 270   [self initWithSize: NSMakeSize (w, h)];
 271
 272   bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
 273                                     pixelsWide: w pixelsHigh: h
 274                                     bitsPerSample: 8 samplesPerPixel: 4
 275                                     hasAlpha: YES isPlanar: YES
 276                                     colorSpaceName: NSCalibratedRGBColorSpace
 277                                     bytesPerRow: w bitsPerPixel: 0];
 278
 279   [bmRep getBitmapDataPlanes: planes];
 280   {
 281     /* pull bits out to set the (bytewise) alpha mask */
 282     int i, j, k;
 283     unsigned char *s = bits;
 284     unsigned char *alpha = planes[3];
 285     unsigned char swt[16] = {0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13,
 286                              3, 11, 7, 15};
 287     unsigned char c, bitPat;
 288
 289     for (j = 0; j < h; j++)
 290       for (i = 0; i < bpr; i++)
 291         {
 292           if (length)
 293             {
 294               unsigned char s1, s2;
 295               while (*s++ != 'x' && s < bits + length);
 296               if (s >= bits + length)
 297                 {
 298                   [bmRep release];
 299                   return nil;
 300                 }
 301 #define hexchar(x) (isdigit (x) ? x - '0' : x - 'a' + 10)
 302               s1 = *s++;
 303               s2 = *s++;
 304               c = hexchar (s1) * 0x10 + hexchar (s2);
 305             }
 306           else
 307             c = *s++;
 308
 309           bitPat = flip ? swt[c >> 4] | (swt[c & 0xf] << 4) : c ^ 255;
 310           for (k =0; k<8; k++)
 311             {
 312               *alpha++ = (bitPat & 0x80) ? 0xff : 0;
 313               bitPat <<= 1;
 314             }
 315         }
 316   }
 317
 318   [self addRepresentation: bmRep];
 319
 320   memset (planes[0], 0, w*h);
 321   memset (planes[1], 0, w*h);
 322   memset (planes[2], 0, w*h);
 323   [self setXBMColor: [NSColor blackColor]];
 324   return self;
 325 }
 326
 327
 328 /* Set color for a bitmap image (see initFromSkipXBM).  Note that the alpha
 329    is used as a mask, so we just memset the entire array. */
 330 - setXBMColor: (NSColor *)color
 331 {
 332   NSSize s = [self size];
 333   int len = (int) s.width * s.height;
 334   unsigned char *planes[5];
 335   CGFloat r, g, b, a;
 336   NSColor *rgbColor;
 337
 338   if (bmRep == nil || color == nil)
 339     return self;
 340
 341   if ([color colorSpaceName] != NSCalibratedRGBColorSpace)
 342     rgbColor = [color colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
 343   else
 344     rgbColor = color;
 345
 346   [rgbColor getRed: &r green: &g blue: &b alpha: &a];
 347
 348   [bmRep getBitmapDataPlanes: planes];
 349
 350   /* we used to just do this, but Cocoa seems to have a bug when rendering
 351      an alpha-masked image onto a dark background where it bloats the mask */
 352    /* memset (planes[0..2], r, g, b*0xff, len); */
 353   {
 354     int i, len = s.width*s.height;
 355     int rr = r * 0xff, gg = g * 0xff, bb = b * 0xff;
 356     for (i =0; i<len; i++)
 357       if (planes[3][i] != 0)
 358         {
 359           planes[0][i] = rr;
 360           planes[1][i] = gg;
 361           planes[2][i] = bb;
 362         }
 363   }
 364
 365   return self;
 366 }
 367
 368
 369 - initForXPMWithDepth: (int)depth width: (int)width height: (int)height
 370 {
 371   NSSize s = {width, height};
 372   int i;
 373
 374   [self initWithSize: s];
 375
 376   bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
 377                                   pixelsWide: width pixelsHigh: height
 378                                   /* keep things simple for now */
 379                                   bitsPerSample: 8 samplesPerPixel: 4 /*RGB+A*/
 380                                   hasAlpha: YES isPlanar: YES
 381                                   colorSpaceName: NSCalibratedRGBColorSpace
 382                                   bytesPerRow: width bitsPerPixel: 0];
 383
 384   [bmRep getBitmapDataPlanes: pixmapData];
 385   for (i =0; i<4; i++)
 386     memset (pixmapData[i], 0, width*height);
 387   [self addRepresentation: bmRep];
 388   return self;
 389 }
 390
 391
 392 /* attempt to pull out pixmap data from a BitmapImageRep; returns NO if fails */
 393 - (void) setPixmapData
 394 {
 395   NSEnumerator *reps;
 396   NSImageRep *rep;
 397
 398   reps = [[self representations] objectEnumerator];
 399   while (rep = (NSImageRep *) [reps nextObject])
 400     {
 401       if ([rep respondsToSelector: @selector (getBitmapDataPlanes:)])
 402         {
 403           bmRep = (NSBitmapImageRep *) rep;
 404           onTiger = [bmRep respondsToSelector: @selector (colorAtX:y:)];
 405
 406           if ([bmRep numberOfPlanes] >= 3)
 407               [bmRep getBitmapDataPlanes: pixmapData];
 408
 409           /* The next two lines cause the DPI of the image to be ignored.
 410              This seems to be the behavior users expect. */
 411           [self setScalesWhenResized: YES];
 412           [self setSize: NSMakeSize([bmRep pixelsWide], [bmRep pixelsHigh])];
 413
 414           break;
 415         }
 416     }
 417 }
 418
 419
 420 /* note; this and next work only for image created with initForXPMWithDepth,
 421          initFromSkipXBM, or where setPixmapData was called successfully */
 422 /* return ARGB */
 423 - (unsigned long) getPixelAtX: (int)x Y: (int)y
 424 {
 425   if (bmRep == nil)
 426     return 0;
 427
 428   /* this method is faster but won't work for bitmaps */
 429   if (pixmapData[0] != NULL)
 430     {
 431       int loc = x + y * [self size].width;
 432       return (pixmapData[3][loc] << 24) /* alpha */
 433        | (pixmapData[0][loc] << 16) | (pixmapData[1][loc] << 8)
 434        | (pixmapData[2][loc]);
 435     }
 436   else if (onTiger)
 437     {
 438       NSColor *color = [bmRep colorAtX: x y: y];
 439       CGFloat r, g, b, a;
 440       [color getRed: &r green: &g blue: &b alpha: &a];
 441       return ((int)(a * 255.0) << 24)
 442         | ((int)(r * 255.0) << 16) | ((int)(g * 255.0) << 8)
 443         | ((int)(b * 255.0));
 444
 445     }
 446   return 0;
 447 }
 448
 449 - (void) setPixelAtX: (int)x Y: (int)y toRed: (unsigned char)r
 450                green: (unsigned char)g blue: (unsigned char)b
 451                alpha:(unsigned char)a;
 452 {
 453   if (bmRep == nil)
 454     return;
 455
 456   if (pixmapData[0] != NULL)
 457     {
 458       int loc = x + y * [self size].width;
 459       pixmapData[0][loc] = r;
 460       pixmapData[1][loc] = g;
 461       pixmapData[2][loc] = b;
 462       pixmapData[3][loc] = a;
 463     }
 464   else if (onTiger)
 465     {
 466       [bmRep setColor:
 467                [NSColor colorWithCalibratedRed: (r/255.0) green: (g/255.0)
 468                                           blue: (b/255.0) alpha: (a/255.0)]
 469                   atX: x y: y];
 470     }
 471 }
 472
 473 - (void) setAlphaAtX: (int) x Y: (int) y to: (unsigned char) a
 474 {
 475   if (bmRep == nil)
 476     return;
 477
 478   if (pixmapData[0] != NULL)
 479     {
 480       int loc = x + y * [self size].width;
 481
 482       pixmapData[3][loc] = a;
 483     }
 484   else if (onTiger)
 485     {
 486       NSColor *color = [bmRep colorAtX: x y: y];
 487       color = [color colorWithAlphaComponent: (a / 255.0)];
 488       [bmRep setColor: color atX: x y: y];
 489     }
 490 }
 491
 492 /* returns a pattern color, which is cached here */
 493 - (NSColor *)stippleMask
 494 {
 495   if (stippleMask == nil)
 496       stippleMask = [[NSColor colorWithPatternImage: self] retain];
 497   return stippleMask;
 498 }
 499
 500 @end
 501