src/nsimage.m

   1 /* Image support for the NeXT/Open/GNUstep and MacOSX window system.
   2    Copyright (C) 1989, 1992, 1993, 1994, 2005, 2006, 2008, 2009, 2010, 2011, 2012
   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   NSTRACE (ns_load_image);
  87
  88   EmacsImage *eImg;
  89   NSSize size;
  90
  91   if (NILP (spec_data))
  92     {
  93       eImg = [EmacsImage allocInitFromFile: spec_file];
  94     }
  95   else
  96     {
  97       NSData *data = [NSData dataWithBytes: SDATA (spec_data)
  98                                     length: SBYTES (spec_data)];
  99       eImg = [[EmacsImage alloc] initWithData: data];
 100       [eImg setPixmapData];
 101     }
 102
 103   if (eImg == nil)
 104     {
 105       add_to_log ("Unable to load image %s", img->spec, Qnil);
 106       return 0;
 107     }
 108
 109   size = [eImg size];
 110   img->width = size.width;
 111   img->height = size.height;
 112
 113   /* 4) set img->pixmap = emacsimage */
 114   img->pixmap = eImg;
 115   return 1;
 116 }
 117
 118
 119 int
 120 ns_image_width (void *img)
 121 {
 122   return [(id)img size].width;
 123 }
 124
 125 int
 126 ns_image_height (void *img)
 127 {
 128   return [(id)img size].height;
 129 }
 130
 131 unsigned long
 132 ns_get_pixel (void *img, int x, int y)
 133 {
 134   return [(EmacsImage *)img getPixelAtX: x Y: y];
 135 }
 136
 137 void
 138 ns_put_pixel (void *img, int x, int y, unsigned long argb)
 139 {
 140   unsigned char alpha = (argb >> 24) & 0xFF;
 141   if (alpha == 0)
 142     alpha = 0xFF;
 143   [(EmacsImage *)img setPixelAtX: x Y: y toRed: (argb >> 16) & 0xFF
 144    green: (argb >> 8) & 0xFF blue: (argb & 0xFF) alpha: alpha];
 145 }
 146
 147 void
 148 ns_set_alpha (void *img, int x, int y, unsigned char a)
 149 {
 150   [(EmacsImage *)img setAlphaAtX: x Y: y to: a];
 151 }
 152
 153
 154 /* ==========================================================================
 155
 156    Class supporting bitmaps and images of various sorts.
 157
 158    ========================================================================== */
 159
 160 @implementation EmacsImage
 161
 162 static EmacsImage *ImageList = nil;
 163
 164 + allocInitFromFile: (Lisp_Object)file
 165 {
 166   EmacsImage *image = ImageList;
 167   NSImageRep *imgRep;
 168   Lisp_Object found;
 169
 170   /* look for an existing image of the same name */
 171   while (image != nil &&
 172          [[image name] compare: [NSString stringWithUTF8String: SDATA (file)]]
 173              != NSOrderedSame)
 174     image = [image imageListNext];
 175
 176   if (image != nil)
 177     {
 178       [image reference];
 179       return image;
 180     }
 181
 182   /* Search bitmap-file-path for the file, if appropriate.  */
 183   found = x_find_image_file (file);
 184   if (!STRINGP (found))
 185     return nil;
 186
 187   image = [[EmacsImage alloc] initByReferencingFile:
 188                      [NSString stringWithUTF8String: SDATA (found)]];
 189
 190   imgRep = [image bestRepresentationForDevice: nil];
 191   if (imgRep == nil)
 192     {
 193       [image release];
 194       return nil;
 195     }
 196
 197   /* The next two lines cause the DPI of the image to be ignored.
 198      This seems to be the behavior users expect. */
 199   [image setScalesWhenResized: YES];
 200   [image setSize: NSMakeSize([imgRep pixelsWide], [imgRep pixelsHigh])];
 201
 202   [image setName: [NSString stringWithUTF8String: SDATA (file)]];
 203   [image reference];
 204   ImageList = [image imageListSetNext: ImageList];
 205
 206   return image;
 207 }
 208
 209
 210 - reference
 211 {
 212   refCount++;
 213   return self;
 214 }
 215
 216
 217 - imageListSetNext: (id)arg
 218 {
 219   imageListNext = arg;
 220   return self;
 221 }
 222
 223
 224 - imageListNext
 225 {
 226   return imageListNext;
 227 }
 228
 229
 230 - (void)dealloc
 231 {
 232   id list = ImageList;
 233
 234   if (refCount > 1)
 235     {
 236       refCount--;
 237       return;
 238     }
 239
 240   [stippleMask release];
 241
 242   if (list == self)
 243     ImageList = imageListNext;
 244   else
 245     {
 246       while (list != nil && [list imageListNext] != self)
 247         list = [list imageListNext];
 248       [list imageListSetNext: imageListNext];
 249     }
 250
 251   [super dealloc];
 252 }
 253
 254
 255 - initFromXBM: (unsigned char *)bits width: (int)w height: (int)h
 256          flip: (BOOL)flip
 257 {
 258   return [self initFromSkipXBM: bits width: w height: h flip: flip length: 0];
 259 }
 260
 261
 262 - initFromSkipXBM: (unsigned char *)bits width: (int)w height: (int)h
 263              flip: (BOOL)flip length: (int)length;
 264 {
 265   int bpr = (w + 7) / 8;
 266   unsigned char *planes[5];
 267
 268   [self initWithSize: NSMakeSize (w, h)];
 269
 270   bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
 271                                     pixelsWide: w pixelsHigh: h
 272                                     bitsPerSample: 8 samplesPerPixel: 4
 273                                     hasAlpha: YES isPlanar: YES
 274                                     colorSpaceName: NSCalibratedRGBColorSpace
 275                                     bytesPerRow: w bitsPerPixel: 0];
 276
 277   [bmRep getBitmapDataPlanes: planes];
 278   {
 279     /* pull bits out to set the (bytewise) alpha mask */
 280     int i, j, k;
 281     unsigned char *s = bits;
 282     unsigned char *alpha = planes[3];
 283     unsigned char swt[16] = {0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13,
 284                              3, 11, 7, 15};
 285     unsigned char c, bitPat;
 286
 287     for (j = 0; j < h; j++)
 288       for (i = 0; i < bpr; i++)
 289         {
 290           if (length)
 291             {
 292               unsigned char s1, s2;
 293               while (*s++ != 'x' && s < bits + length);
 294               if (s >= bits + length)
 295                 {
 296                   [bmRep release];
 297                   return nil;
 298                 }
 299 #define hexchar(x) (isdigit (x) ? x - '0' : x - 'a' + 10)
 300               s1 = *s++;
 301               s2 = *s++;
 302               c = hexchar (s1) * 0x10 + hexchar (s2);
 303             }
 304           else
 305             c = *s++;
 306
 307           bitPat = flip ? swt[c >> 4] | (swt[c & 0xf] << 4) : c ^ 255;
 308           for (k =0; k<8; k++)
 309             {
 310               *alpha++ = (bitPat & 0x80) ? 0xff : 0;
 311               bitPat <<= 1;
 312             }
 313         }
 314   }
 315
 316   [self addRepresentation: bmRep];
 317
 318   bzero (planes[0], w*h);
 319   bzero (planes[1], w*h);
 320   bzero (planes[2], w*h);
 321   [self setXBMColor: [NSColor blackColor]];
 322   return self;
 323 }
 324
 325
 326 /* Set color for a bitmap image (see initFromSkipXBM).  Note that the alpha
 327    is used as a mask, so we just memset the entire array. */
 328 - setXBMColor: (NSColor *)color
 329 {
 330   NSSize s = [self size];
 331   int len = (int) s.width * s.height;
 332   unsigned char *planes[5];
 333   CGFloat r, g, b, a;
 334   NSColor *rgbColor;
 335
 336   if (bmRep == nil || color == nil)
 337     return;
 338
 339   if ([color colorSpaceName] != NSCalibratedRGBColorSpace)
 340     rgbColor = [color colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
 341   else
 342     rgbColor = color;
 343
 344   [rgbColor getRed: &r green: &g blue: &b alpha: &a];
 345
 346   [bmRep getBitmapDataPlanes: planes];
 347
 348   /* we used to just do this, but Cocoa seems to have a bug when rendering
 349      an alpha-masked image onto a dark background where it bloats the mask */
 350    /* memset (planes[0..2], r, g, b*0xff, len); */
 351   {
 352     int i, len = s.width*s.height;
 353     int rr = r * 0xff, gg = g * 0xff, bb = b * 0xff;
 354     for (i =0; i<len; i++)
 355       if (planes[3][i] != 0)
 356         {
 357           planes[0][i] = rr;
 358           planes[1][i] = gg;
 359           planes[2][i] = bb;
 360         }
 361   }
 362 }
 363
 364
 365 - initForXPMWithDepth: (int)depth width: (int)width height: (int)height
 366 {
 367   NSSize s = {width, height};
 368   int i;
 369
 370   [self initWithSize: s];
 371
 372   bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
 373                                   pixelsWide: width pixelsHigh: height
 374                                   /* keep things simple for now */
 375                                   bitsPerSample: 8 samplesPerPixel: 4 /*RGB+A*/
 376                                   hasAlpha: YES isPlanar: YES
 377                                   colorSpaceName: NSCalibratedRGBColorSpace
 378                                   bytesPerRow: width bitsPerPixel: 0];
 379
 380   [bmRep getBitmapDataPlanes: pixmapData];
 381   for (i =0; i<4; i++)
 382     bzero (pixmapData[i], width*height);
 383   [self addRepresentation: bmRep];
 384   return self;
 385 }
 386
 387
 388 /* attempt to pull out pixmap data from a BitmapImageRep; returns NO if fails */
 389 - (void) setPixmapData
 390 {
 391   NSEnumerator *reps;
 392   NSImageRep *rep;
 393
 394   reps = [[self representations] objectEnumerator];
 395   while (rep = (NSImageRep *) [reps nextObject])
 396     {
 397       if ([rep respondsToSelector: @selector (getBitmapDataPlanes:)])
 398         {
 399           bmRep = (NSBitmapImageRep *) rep;
 400           onTiger = [bmRep respondsToSelector: @selector (colorAtX:y:)];
 401
 402           if ([bmRep numberOfPlanes] >= 3)
 403               [bmRep getBitmapDataPlanes: pixmapData];
 404
 405           /* The next two lines cause the DPI of the image to be ignored.
 406              This seems to be the behavior users expect. */
 407           [self setScalesWhenResized: YES];
 408           [self setSize: NSMakeSize([bmRep pixelsWide], [bmRep pixelsHigh])];
 409
 410           break;
 411         }
 412     }
 413 }
 414
 415
 416 /* note; this and next work only for image created with initForXPMWithDepth,
 417          initFromSkipXBM, or where setPixmapData was called successfully */
 418 /* return ARGB */
 419 - (unsigned long) getPixelAtX: (int)x Y: (int)y
 420 {
 421   if (bmRep == nil)
 422     return 0;
 423
 424   /* this method is faster but won't work for bitmaps */
 425   if (pixmapData[0] != NULL)
 426     {
 427       int loc = x + y * [self size].width;
 428       return (pixmapData[3][loc] << 24) /* alpha */
 429        | (pixmapData[0][loc] << 16) | (pixmapData[1][loc] << 8)
 430        | (pixmapData[2][loc]);
 431     }
 432   else if (onTiger)
 433     {
 434       NSColor *color = [bmRep colorAtX: x y: y];
 435       CGFloat r, g, b, a;
 436       [color getRed: &r green: &g blue: &b alpha: &a];
 437       return ((int)(a * 255.0) << 24)
 438         | ((int)(r * 255.0) << 16) | ((int)(g * 255.0) << 8)
 439         | ((int)(b * 255.0));
 440
 441     }
 442   return 0;
 443 }
 444
 445 - (void) setPixelAtX: (int)x Y: (int)y toRed: (unsigned char)r
 446                green: (unsigned char)g blue: (unsigned char)b
 447                alpha:(unsigned char)a;
 448 {
 449   if (bmRep == nil)
 450     return;
 451
 452   if (pixmapData[0] != NULL)
 453     {
 454       int loc = x + y * [self size].width;
 455       pixmapData[0][loc] = r;
 456       pixmapData[1][loc] = g;
 457       pixmapData[2][loc] = b;
 458       pixmapData[3][loc] = a;
 459     }
 460   else if (onTiger)
 461     {
 462       [bmRep setColor:
 463                [NSColor colorWithCalibratedRed: (r/255.0) green: (g/255.0)
 464                                           blue: (b/255.0) alpha: (a/255.0)]
 465                   atX: x y: y];
 466     }
 467 }
 468
 469 - (void) setAlphaAtX: (int) x Y: (int) y to: (unsigned char) a
 470 {
 471   if (bmRep == nil)
 472     return;
 473
 474   if (pixmapData[0] != NULL)
 475     {
 476       int loc = x + y * [self size].width;
 477
 478       pixmapData[3][loc] = a;
 479     }
 480   else if (onTiger)
 481     {
 482       NSColor *color = [bmRep colorAtX: x y: y];
 483       color = [color colorWithAlphaComponent: (a / 255.0)];
 484       [bmRep setColor: color atX: x y: y];
 485     }
 486 }
 487
 488 /* returns a pattern color, which is cached here */
 489 - (NSColor *)stippleMask
 490 {
 491   if (stippleMask == nil)
 492       stippleMask = [[NSColor colorWithPatternImage: self] retain];
 493   return stippleMask;
 494 }
 495
 496 @end
 497
 498 // arch-tag: 6b310280-6892-4e5e-8f34-41c4d384874f