1. Nic Ferrier
  2. emacs

Source

emacs / src / nsimage.m

  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
451
452
453
454
455
456
457
458
459
460
461
462
463
464
465
466
467
468
469
470
471
472
473
474
475
476
477
478
479
480
481
482
483
484
485
486
487
488
489
490
491
492
493
494
495
496
497
498
499
500
501
502
503
504
505
/* Image support for the NeXT/Open/GNUstep and MacOSX window system.
   Copyright (C) 1989, 1992-1994, 2005-2006, 2008-2011
     Free Software Foundation, Inc.

This file is part of GNU Emacs.

GNU Emacs is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

GNU Emacs is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.  */

/*
Originally by Carl Edman
Updated by Christian Limpach (chris@nice.ch)
OpenStep/Rhapsody port by Scott Bender (sbender@harmony-ds.com)
MacOSX/Aqua port by Christophe de Dinechin (descubes@earthlink.net)
GNUstep port and post-20 update by Adrian Robert (arobert@cogsci.ucsd.edu)
*/

/* This should be the first include, as it may set up #defines affecting
   interpretation of even the system includes. */
#include <config.h>
#include <setjmp.h>

#include "lisp.h"
#include "dispextern.h"
#include "nsterm.h"
#include "frame.h"

extern Lisp_Object QCfile, QCdata;

/* call tracing */
#if 0
int image_trace_num = 0;
#define NSTRACE(x)        fprintf (stderr, "%s:%d: [%d] " #x "\n",         \
                                __FILE__, __LINE__, ++image_trace_num)
#else
#define NSTRACE(x)
#endif


/* ==========================================================================

   C interface.  This allows easy calling from C files.  We could just
   compile everything as Objective-C, but that might mean slower
   compilation and possible difficulties on some platforms..

   ========================================================================== */

void *
ns_image_from_XBM (unsigned char *bits, int width, int height)
{
  NSTRACE (ns_image_from_XBM);
  return [[EmacsImage alloc] initFromXBM: bits
                                   width: width height: height
                                    flip: YES];
}

void *
ns_image_for_XPM (int width, int height, int depth)
{
  NSTRACE (ns_image_for_XPM);
  return [[EmacsImage alloc] initForXPMWithDepth: depth
                                           width: width height: height];
}

void *
ns_image_from_file (Lisp_Object file)
{
  NSTRACE (ns_image_from_bitmap_file);
  return [EmacsImage allocInitFromFile: file];
}

int
ns_load_image (struct frame *f, struct image *img,
               Lisp_Object spec_file, Lisp_Object spec_data)
{
  EmacsImage *eImg = nil;
  NSSize size;

  NSTRACE (ns_load_image);

  if (STRINGP (spec_file))
    {
      eImg = [EmacsImage allocInitFromFile: spec_file];
    }
  else if (STRINGP (spec_data))
    {
      NSData *data;

      data = [NSData dataWithBytes: SDATA (spec_data)
			    length: SBYTES (spec_data)];
      eImg = [[EmacsImage alloc] initWithData: data];
      [eImg setPixmapData];
    }

  if (eImg == nil)
    {
      add_to_log ("Unable to load image %s", img->spec, Qnil);
      return 0;
    }

  size = [eImg size];
  img->width = size.width;
  img->height = size.height;

  /* 4) set img->pixmap = emacsimage */
  img->pixmap = eImg;
  return 1;
}


int
ns_image_width (void *img)
{
  return [(id)img size].width;
}

int
ns_image_height (void *img)
{
  return [(id)img size].height;
}

unsigned long
ns_get_pixel (void *img, int x, int y)
{
  return [(EmacsImage *)img getPixelAtX: x Y: y];
}

void
ns_put_pixel (void *img, int x, int y, unsigned long argb)
{
  unsigned char alpha = (argb >> 24) & 0xFF;
  if (alpha == 0)
    alpha = 0xFF;
  [(EmacsImage *)img setPixelAtX: x Y: y toRed: (argb >> 16) & 0xFF
   green: (argb >> 8) & 0xFF blue: (argb & 0xFF) alpha: alpha];
}

void
ns_set_alpha (void *img, int x, int y, unsigned char a)
{
  [(EmacsImage *)img setAlphaAtX: x Y: y to: a];
}


/* ==========================================================================

   Class supporting bitmaps and images of various sorts.

   ========================================================================== */

@implementation EmacsImage

static EmacsImage *ImageList = nil;

+ allocInitFromFile: (Lisp_Object)file
{
  EmacsImage *image = ImageList;
  NSImageRep *imgRep;
  Lisp_Object found;

  /* look for an existing image of the same name */
  while (image != nil &&
         [[image name] compare: [NSString stringWithUTF8String: SDATA (file)]]
             != NSOrderedSame)
    image = [image imageListNext];

  if (image != nil)
    {
      [image reference];
      return image;
    }

  /* Search bitmap-file-path for the file, if appropriate.  */
  found = x_find_image_file (file);
  if (!STRINGP (found))
    return nil;

  image = [[EmacsImage alloc] initByReferencingFile:
                     [NSString stringWithUTF8String: SDATA (found)]];

#if defined (NS_IMPL_COCOA) && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_6
  imgRep = [NSBitmapImageRep imageRepWithData:[image TIFFRepresentation]];
#else
  imgRep = [image bestRepresentationForDevice: nil];
#endif
  if (imgRep == nil)
    {
      [image release];
      return nil;
    }

  /* The next two lines cause the DPI of the image to be ignored.
     This seems to be the behavior users expect. */
  [image setScalesWhenResized: YES];
  [image setSize: NSMakeSize([imgRep pixelsWide], [imgRep pixelsHigh])];

  [image setName: [NSString stringWithUTF8String: SDATA (file)]];
  [image reference];
  ImageList = [image imageListSetNext: ImageList];

  return image;
}


- reference
{
  refCount++;
  return self;
}


- imageListSetNext: (id)arg
{
  imageListNext = arg;
  return self;
}


- imageListNext
{
  return imageListNext;
}


- (void)dealloc
{
  id list = ImageList;

  if (refCount > 1)
    {
      refCount--;
      return;
    }

  [stippleMask release];

  if (list == self)
    ImageList = imageListNext;
  else
    {
      while (list != nil && [list imageListNext] != self)
        list = [list imageListNext];
      [list imageListSetNext: imageListNext];
    }

  [super dealloc];
}


- initFromXBM: (unsigned char *)bits width: (int)w height: (int)h
         flip: (BOOL)flip
{
  return [self initFromSkipXBM: bits width: w height: h flip: flip length: 0];
}


- initFromSkipXBM: (unsigned char *)bits width: (int)w height: (int)h
             flip: (BOOL)flip length: (int)length;
{
  int bpr = (w + 7) / 8;
  unsigned char *planes[5];

  [self initWithSize: NSMakeSize (w, h)];

  bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
                                    pixelsWide: w pixelsHigh: h
                                    bitsPerSample: 8 samplesPerPixel: 4
                                    hasAlpha: YES isPlanar: YES
                                    colorSpaceName: NSCalibratedRGBColorSpace
                                    bytesPerRow: w bitsPerPixel: 0];

  [bmRep getBitmapDataPlanes: planes];
  {
    /* pull bits out to set the (bytewise) alpha mask */
    int i, j, k;
    unsigned char *s = bits;
    unsigned char *alpha = planes[3];
    unsigned char swt[16] = {0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13,
                             3, 11, 7, 15};
    unsigned char c, bitPat;

    for (j = 0; j < h; j++)
      for (i = 0; i < bpr; i++)
        {
          if (length)
            {
              unsigned char s1, s2;
              while (*s++ != 'x' && s < bits + length);
              if (s >= bits + length)
                {
                  [bmRep release];
                  return nil;
                }
#define hexchar(x) (isdigit (x) ? x - '0' : x - 'a' + 10)
              s1 = *s++;
              s2 = *s++;
              c = hexchar (s1) * 0x10 + hexchar (s2);
            }
          else
            c = *s++;

          bitPat = flip ? swt[c >> 4] | (swt[c & 0xf] << 4) : c ^ 255;
          for (k =0; k<8; k++)
            {
              *alpha++ = (bitPat & 0x80) ? 0xff : 0;
              bitPat <<= 1;
            }
        }
  }

  [self addRepresentation: bmRep];

  memset (planes[0], 0, w*h);
  memset (planes[1], 0, w*h);
  memset (planes[2], 0, w*h);
  [self setXBMColor: [NSColor blackColor]];
  return self;
}


/* Set color for a bitmap image (see initFromSkipXBM).  Note that the alpha
   is used as a mask, so we just memset the entire array. */
- setXBMColor: (NSColor *)color
{
  NSSize s = [self size];
  int len = (int) s.width * s.height;
  unsigned char *planes[5];
  CGFloat r, g, b, a;
  NSColor *rgbColor;

  if (bmRep == nil || color == nil)
    return self;

  if ([color colorSpaceName] != NSCalibratedRGBColorSpace)
    rgbColor = [color colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
  else
    rgbColor = color;

  [rgbColor getRed: &r green: &g blue: &b alpha: &a];

  [bmRep getBitmapDataPlanes: planes];

  /* we used to just do this, but Cocoa seems to have a bug when rendering
     an alpha-masked image onto a dark background where it bloats the mask */
   /* memset (planes[0..2], r, g, b*0xff, len); */
  {
    int i, len = s.width*s.height;
    int rr = r * 0xff, gg = g * 0xff, bb = b * 0xff;
    for (i =0; i<len; i++)
      if (planes[3][i] != 0)
        {
          planes[0][i] = rr;
          planes[1][i] = gg;
          planes[2][i] = bb;
        }
  }

  return self;
}


- initForXPMWithDepth: (int)depth width: (int)width height: (int)height
{
  NSSize s = {width, height};
  int i;

  [self initWithSize: s];

  bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
                                  pixelsWide: width pixelsHigh: height
                                  /* keep things simple for now */
                                  bitsPerSample: 8 samplesPerPixel: 4 /*RGB+A*/
                                  hasAlpha: YES isPlanar: YES
                                  colorSpaceName: NSCalibratedRGBColorSpace
                                  bytesPerRow: width bitsPerPixel: 0];

  [bmRep getBitmapDataPlanes: pixmapData];
  for (i =0; i<4; i++)
    memset (pixmapData[i], 0, width*height);
  [self addRepresentation: bmRep];
  return self;
}


/* attempt to pull out pixmap data from a BitmapImageRep; returns NO if fails */
- (void) setPixmapData
{
  NSEnumerator *reps;
  NSImageRep *rep;

  reps = [[self representations] objectEnumerator];
  while (rep = (NSImageRep *) [reps nextObject])
    {
      if ([rep respondsToSelector: @selector (getBitmapDataPlanes:)])
        {
          bmRep = (NSBitmapImageRep *) rep;
          onTiger = [bmRep respondsToSelector: @selector (colorAtX:y:)];

          if ([bmRep numberOfPlanes] >= 3)
              [bmRep getBitmapDataPlanes: pixmapData];

          /* The next two lines cause the DPI of the image to be ignored.
             This seems to be the behavior users expect. */
          [self setScalesWhenResized: YES];
          [self setSize: NSMakeSize([bmRep pixelsWide], [bmRep pixelsHigh])];

          break;
        }
    }
}


/* note; this and next work only for image created with initForXPMWithDepth,
         initFromSkipXBM, or where setPixmapData was called successfully */
/* return ARGB */
- (unsigned long) getPixelAtX: (int)x Y: (int)y
{
  if (bmRep == nil)
    return 0;

  /* this method is faster but won't work for bitmaps */
  if (pixmapData[0] != NULL)
    {
      int loc = x + y * [self size].width;
      return (pixmapData[3][loc] << 24) /* alpha */
       | (pixmapData[0][loc] << 16) | (pixmapData[1][loc] << 8)
       | (pixmapData[2][loc]);
    }
  else if (onTiger)
    {
      NSColor *color = [bmRep colorAtX: x y: y];
      CGFloat r, g, b, a;
      [color getRed: &r green: &g blue: &b alpha: &a];
      return ((int)(a * 255.0) << 24)
        | ((int)(r * 255.0) << 16) | ((int)(g * 255.0) << 8)
        | ((int)(b * 255.0));

    }
  return 0;
}

- (void) setPixelAtX: (int)x Y: (int)y toRed: (unsigned char)r
               green: (unsigned char)g blue: (unsigned char)b
               alpha:(unsigned char)a;
{
  if (bmRep == nil)
    return;

  if (pixmapData[0] != NULL)
    {
      int loc = x + y * [self size].width;
      pixmapData[0][loc] = r;
      pixmapData[1][loc] = g;
      pixmapData[2][loc] = b;
      pixmapData[3][loc] = a;
    }
  else if (onTiger)
    {
      [bmRep setColor:
               [NSColor colorWithCalibratedRed: (r/255.0) green: (g/255.0)
                                          blue: (b/255.0) alpha: (a/255.0)]
                  atX: x y: y];
    }
}

- (void) setAlphaAtX: (int) x Y: (int) y to: (unsigned char) a
{
  if (bmRep == nil)
    return;

  if (pixmapData[0] != NULL)
    {
      int loc = x + y * [self size].width;

      pixmapData[3][loc] = a;
    }
  else if (onTiger)
    {
      NSColor *color = [bmRep colorAtX: x y: y];
      color = [color colorWithAlphaComponent: (a / 255.0)];
      [bmRep setColor: color atX: x y: y];
    }
}

/* returns a pattern color, which is cached here */
- (NSColor *)stippleMask
{
  if (stippleMask == nil)
      stippleMask = [[NSColor colorWithPatternImage: self] retain];
  return stippleMask;
}

@end