1 /* Image support for the NeXT/Open/GNUstep and MacOSX window system.
2 Copyright (C) 1989, 1992-1994, 2005-2006, 2008-2014 Free Software
5 This file is part of GNU Emacs.
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.
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.
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/>. */
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)
28 /* This should be the first include, as it may set up #defines affecting
29 interpretation of even the system includes. */
33 #include "dispextern.h"
37 extern Lisp_Object QCfile, QCdata;
41 int image_trace_num = 0;
42 #define NSTRACE(x) fprintf (stderr, "%s:%d: [%d] " #x "\n", \
43 __FILE__, __LINE__, ++image_trace_num)
49 /* ==========================================================================
51 C interface. This allows easy calling from C files. We could just
52 compile everything as Objective-C, but that might mean slower
53 compilation and possible difficulties on some platforms..
55 ========================================================================== */
58 ns_image_from_XBM (unsigned char *bits, int width, int height)
60 NSTRACE (ns_image_from_XBM);
61 return [[EmacsImage alloc] initFromXBM: bits
62 width: width height: height
67 ns_image_for_XPM (int width, int height, int depth)
69 NSTRACE (ns_image_for_XPM);
70 return [[EmacsImage alloc] initForXPMWithDepth: depth
71 width: width height: height];
75 ns_image_from_file (Lisp_Object file)
77 NSTRACE (ns_image_from_bitmap_file);
78 return [EmacsImage allocInitFromFile: file];
82 ns_load_image (struct frame *f, struct image *img,
83 Lisp_Object spec_file, Lisp_Object spec_data)
85 EmacsImage *eImg = nil;
88 NSTRACE (ns_load_image);
90 if (STRINGP (spec_file))
92 eImg = [EmacsImage allocInitFromFile: spec_file];
94 else if (STRINGP (spec_data))
98 data = [NSData dataWithBytes: SSDATA (spec_data)
99 length: SBYTES (spec_data)];
100 eImg = [[EmacsImage alloc] initWithData: data];
101 [eImg setPixmapData];
106 add_to_log ("Unable to load image %s", img->spec, Qnil);
111 img->width = size.width;
112 img->height = size.height;
114 /* 4) set img->pixmap = emacsimage */
121 ns_image_width (void *img)
123 return [(id)img size].width;
127 ns_image_height (void *img)
129 return [(id)img size].height;
133 ns_get_pixel (void *img, int x, int y)
135 return [(EmacsImage *)img getPixelAtX: x Y: y];
139 ns_put_pixel (void *img, int x, int y, unsigned long argb)
141 unsigned char alpha = (argb >> 24) & 0xFF;
144 [(EmacsImage *)img setPixelAtX: x Y: y toRed: (argb >> 16) & 0xFF
145 green: (argb >> 8) & 0xFF blue: (argb & 0xFF) alpha: alpha];
149 ns_set_alpha (void *img, int x, int y, unsigned char a)
151 [(EmacsImage *)img setAlphaAtX: x Y: y to: a];
155 /* ==========================================================================
157 Class supporting bitmaps and images of various sorts.
159 ========================================================================== */
161 @implementation EmacsImage
163 + allocInitFromFile: (Lisp_Object)file
169 /* Search bitmap-file-path for the file, if appropriate. */
170 found = x_find_image_file (file);
171 if (!STRINGP (found))
174 image = [[EmacsImage alloc] initByReferencingFile:
175 [NSString stringWithUTF8String: SSDATA (found)]];
179 imgRep = [NSBitmapImageRep imageRepWithData:[image TIFFRepresentation]];
181 imgRep = [image bestRepresentationForDevice: nil];
189 /* The next two lines cause the DPI of the image to be ignored.
190 This seems to be the behavior users expect. */
191 [image setScalesWhenResized: YES];
192 [image setSize: NSMakeSize([imgRep pixelsWide], [imgRep pixelsHigh])];
194 [image setName: [NSString stringWithUTF8String: SSDATA (file)]];
202 [stippleMask release];
208 - initFromXBM: (unsigned char *)bits width: (int)w height: (int)h
211 return [self initFromSkipXBM: bits width: w height: h flip: flip length: 0];
215 - initFromSkipXBM: (unsigned char *)bits width: (int)w height: (int)h
216 flip: (BOOL)flip length: (int)length;
218 int bpr = (w + 7) / 8;
219 unsigned char *planes[5];
221 [self initWithSize: NSMakeSize (w, h)];
223 bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
224 pixelsWide: w pixelsHigh: h
225 bitsPerSample: 8 samplesPerPixel: 4
226 hasAlpha: YES isPlanar: YES
227 colorSpaceName: NSCalibratedRGBColorSpace
228 bytesPerRow: w bitsPerPixel: 0];
230 [bmRep getBitmapDataPlanes: planes];
232 /* pull bits out to set the (bytewise) alpha mask */
234 unsigned char *s = bits;
235 unsigned char *alpha = planes[3];
236 unsigned char swt[16] = {0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13,
238 unsigned char c, bitPat;
240 for (j = 0; j < h; j++)
241 for (i = 0; i < bpr; i++)
245 unsigned char s1, s2;
246 while (*s++ != 'x' && s < bits + length);
247 if (s >= bits + length)
252 #define hexchar(x) ('0' <= (x) && (x) <= '9' ? (x) - '0' : (x) - 'a' + 10)
255 c = hexchar (s1) * 0x10 + hexchar (s2);
260 bitPat = flip ? swt[c >> 4] | (swt[c & 0xf] << 4) : c ^ 255;
263 *alpha++ = (bitPat & 0x80) ? 0xff : 0;
269 [self addRepresentation: bmRep];
271 memset (planes[0], 0, w*h);
272 memset (planes[1], 0, w*h);
273 memset (planes[2], 0, w*h);
274 [self setXBMColor: [NSColor blackColor]];
279 /* Set color for a bitmap image (see initFromSkipXBM). Note that the alpha
280 is used as a mask, so we just memset the entire array. */
281 - setXBMColor: (NSColor *)color
283 NSSize s = [self size];
284 unsigned char *planes[5];
285 EmacsCGFloat r, g, b, a;
288 if (bmRep == nil || color == nil)
291 if ([color colorSpaceName] != NSCalibratedRGBColorSpace)
292 rgbColor = [color colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
296 [rgbColor getRed: &r green: &g blue: &b alpha: &a];
298 [bmRep getBitmapDataPlanes: planes];
300 /* we used to just do this, but Cocoa seems to have a bug when rendering
301 an alpha-masked image onto a dark background where it bloats the mask */
302 /* memset (planes[0..2], r, g, b*0xff, len); */
304 int i, len = s.width*s.height;
305 int rr = r * 0xff, gg = g * 0xff, bb = b * 0xff;
306 for (i =0; i<len; i++)
307 if (planes[3][i] != 0)
319 - initForXPMWithDepth: (int)depth width: (int)width height: (int)height
321 NSSize s = {width, height};
324 [self initWithSize: s];
326 bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
327 pixelsWide: width pixelsHigh: height
328 /* keep things simple for now */
329 bitsPerSample: 8 samplesPerPixel: 4 /*RGB+A*/
330 hasAlpha: YES isPlanar: YES
331 colorSpaceName: NSCalibratedRGBColorSpace
332 bytesPerRow: width bitsPerPixel: 0];
334 [bmRep getBitmapDataPlanes: pixmapData];
336 memset (pixmapData[i], 0, width*height);
337 [self addRepresentation: bmRep];
342 /* attempt to pull out pixmap data from a BitmapImageRep; returns NO if fails */
343 - (void) setPixmapData
348 reps = [[self representations] objectEnumerator];
349 while ((rep = (NSImageRep *) [reps nextObject]))
351 if ([rep respondsToSelector: @selector (getBitmapDataPlanes:)])
353 bmRep = (NSBitmapImageRep *) rep;
355 if ([bmRep numberOfPlanes] >= 3)
356 [bmRep getBitmapDataPlanes: pixmapData];
358 /* The next two lines cause the DPI of the image to be ignored.
359 This seems to be the behavior users expect. */
360 [self setScalesWhenResized: YES];
361 [self setSize: NSMakeSize([bmRep pixelsWide], [bmRep pixelsHigh])];
369 /* note; this and next work only for image created with initForXPMWithDepth,
370 initFromSkipXBM, or where setPixmapData was called successfully */
372 - (unsigned long) getPixelAtX: (int)x Y: (int)y
377 /* this method is faster but won't work for bitmaps */
378 if (pixmapData[0] != NULL)
380 int loc = x + y * [self size].width;
381 return (pixmapData[3][loc] << 24) /* alpha */
382 | (pixmapData[0][loc] << 16) | (pixmapData[1][loc] << 8)
383 | (pixmapData[2][loc]);
387 NSColor *color = [bmRep colorAtX: x y: y];
388 EmacsCGFloat r, g, b, a;
389 [color getRed: &r green: &g blue: &b alpha: &a];
390 return ((int)(a * 255.0) << 24)
391 | ((int)(r * 255.0) << 16) | ((int)(g * 255.0) << 8)
392 | ((int)(b * 255.0));
397 - (void) setPixelAtX: (int)x Y: (int)y toRed: (unsigned char)r
398 green: (unsigned char)g blue: (unsigned char)b
399 alpha:(unsigned char)a;
404 if (pixmapData[0] != NULL)
406 int loc = x + y * [self size].width;
407 pixmapData[0][loc] = r;
408 pixmapData[1][loc] = g;
409 pixmapData[2][loc] = b;
410 pixmapData[3][loc] = a;
415 [NSColor colorWithCalibratedRed: (r/255.0) green: (g/255.0)
416 blue: (b/255.0) alpha: (a/255.0)]
421 - (void) setAlphaAtX: (int) x Y: (int) y to: (unsigned char) a
426 if (pixmapData[0] != NULL)
428 int loc = x + y * [self size].width;
430 pixmapData[3][loc] = a;
434 NSColor *color = [bmRep colorAtX: x y: y];
435 color = [color colorWithAlphaComponent: (a / 255.0)];
436 [bmRep setColor: color atX: x y: y];
440 /* returns a pattern color, which is cached here */
441 - (NSColor *)stippleMask
443 if (stippleMask == nil)
444 stippleMask = [[NSColor colorWithPatternImage: self] retain];