1 /* Image support for the NeXT/Open/GNUstep and MacOSX window system.
2 Copyright (C) 1989, 1992, 1993, 1994, 2005, 2006, 2008, 2009, 2010
3 Free Software Foundation, Inc.
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. */
34 #include "dispextern.h"
38 extern Lisp_Object QCfile, QCdata;
42 int image_trace_num = 0;
43 #define NSTRACE(x) fprintf (stderr, "%s:%d: [%d] " #x "\n", \
44 __FILE__, __LINE__, ++image_trace_num)
50 /* ==========================================================================
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..
56 ========================================================================== */
59 ns_image_from_XBM (unsigned char *bits, int width, int height)
61 NSTRACE (ns_image_from_XBM);
62 return [[EmacsImage alloc] initFromXBM: bits
63 width: width height: height
68 ns_image_for_XPM (int width, int height, int depth)
70 NSTRACE (ns_image_for_XPM);
71 return [[EmacsImage alloc] initForXPMWithDepth: depth
72 width: width height: height];
76 ns_image_from_file (Lisp_Object file)
78 NSTRACE (ns_image_from_bitmap_file);
79 return [EmacsImage allocInitFromFile: file];
83 ns_load_image (struct frame *f, struct image *img,
84 Lisp_Object spec_file, Lisp_Object spec_data)
86 NSTRACE (ns_load_image);
93 eImg = [EmacsImage allocInitFromFile: spec_file];
97 NSData *data = [NSData dataWithBytes: SDATA (spec_data)
98 length: SBYTES (spec_data)];
99 eImg = [[EmacsImage alloc] initWithData: data];
100 [eImg setPixmapData];
105 add_to_log ("Unable to load image %s", img->spec, Qnil);
110 img->width = size.width;
111 img->height = size.height;
113 /* 4) set img->pixmap = emacsimage */
120 ns_image_width (void *img)
122 return [(id)img size].width;
126 ns_image_height (void *img)
128 return [(id)img size].height;
132 ns_get_pixel (void *img, int x, int y)
134 return [(EmacsImage *)img getPixelAtX: x Y: y];
138 ns_put_pixel (void *img, int x, int y, unsigned long argb)
140 unsigned char alpha = (argb >> 24) & 0xFF;
143 [(EmacsImage *)img setPixelAtX: x Y: y toRed: (argb >> 16) & 0xFF
144 green: (argb >> 8) & 0xFF blue: (argb & 0xFF) alpha: alpha];
148 ns_set_alpha (void *img, int x, int y, unsigned char a)
150 [(EmacsImage *)img setAlphaAtX: x Y: y to: a];
154 /* ==========================================================================
156 Class supporting bitmaps and images of various sorts.
158 ========================================================================== */
160 @implementation EmacsImage
162 static EmacsImage *ImageList = nil;
164 + allocInitFromFile: (Lisp_Object)file
166 EmacsImage *image = ImageList;
170 /* look for an existing image of the same name */
171 while (image != nil &&
172 [[image name] compare: [NSString stringWithUTF8String: SDATA (file)]]
174 image = [image imageListNext];
182 /* Search bitmap-file-path for the file, if appropriate. */
183 found = x_find_image_file (file);
184 if (!STRINGP (found))
187 image = [[EmacsImage alloc] initByReferencingFile:
188 [NSString stringWithUTF8String: SDATA (found)]];
190 imgRep = [image bestRepresentationForDevice: nil];
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])];
202 [image setName: [NSString stringWithUTF8String: SDATA (file)]];
204 ImageList = [image imageListSetNext: ImageList];
217 - imageListSetNext: (id)arg
226 return imageListNext;
240 [stippleMask release];
243 ImageList = imageListNext;
246 while (list != nil && [list imageListNext] != self)
247 list = [list imageListNext];
248 [list imageListSetNext: imageListNext];
255 - initFromXBM: (unsigned char *)bits width: (int)w height: (int)h
258 return [self initFromSkipXBM: bits width: w height: h flip: flip length: 0];
262 - initFromSkipXBM: (unsigned char *)bits width: (int)w height: (int)h
263 flip: (BOOL)flip length: (int)length;
265 int bpr = (w + 7) / 8;
266 unsigned char *planes[5];
268 [self initWithSize: NSMakeSize (w, h)];
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];
277 [bmRep getBitmapDataPlanes: planes];
279 /* pull bits out to set the (bytewise) alpha mask */
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,
285 unsigned char c, bitPat;
287 for (j = 0; j < h; j++)
288 for (i = 0; i < bpr; i++)
292 unsigned char s1, s2;
293 while (*s++ != 'x' && s < bits + length);
294 if (s >= bits + length)
299 #define hexchar(x) (isdigit (x) ? x - '0' : x - 'a' + 10)
302 c = hexchar (s1) * 0x10 + hexchar (s2);
307 bitPat = flip ? swt[c >> 4] | (swt[c & 0xf] << 4) : c ^ 255;
310 *alpha++ = (bitPat & 0x80) ? 0xff : 0;
316 [self addRepresentation: bmRep];
318 bzero (planes[0], w*h);
319 bzero (planes[1], w*h);
320 bzero (planes[2], w*h);
321 [self setXBMColor: [NSColor blackColor]];
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
330 NSSize s = [self size];
331 int len = (int) s.width * s.height;
332 unsigned char *planes[5];
336 if (bmRep == nil || color == nil)
339 if ([color colorSpaceName] != NSCalibratedRGBColorSpace)
340 rgbColor = [color colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
344 [rgbColor getRed: &r green: &g blue: &b alpha: &a];
346 [bmRep getBitmapDataPlanes: planes];
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); */
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)
365 - initForXPMWithDepth: (int)depth width: (int)width height: (int)height
367 NSSize s = {width, height};
370 [self initWithSize: s];
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];
380 [bmRep getBitmapDataPlanes: pixmapData];
382 bzero (pixmapData[i], width*height);
383 [self addRepresentation: bmRep];
388 /* attempt to pull out pixmap data from a BitmapImageRep; returns NO if fails */
389 - (void) setPixmapData
394 reps = [[self representations] objectEnumerator];
395 while (rep = (NSImageRep *) [reps nextObject])
397 if ([rep respondsToSelector: @selector (getBitmapDataPlanes:)])
399 bmRep = (NSBitmapImageRep *) rep;
400 onTiger = [bmRep respondsToSelector: @selector (colorAtX:y:)];
402 if ([bmRep numberOfPlanes] >= 3)
403 [bmRep getBitmapDataPlanes: pixmapData];
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])];
416 /* note; this and next work only for image created with initForXPMWithDepth,
417 initFromSkipXBM, or where setPixmapData was called successfully */
419 - (unsigned long) getPixelAtX: (int)x Y: (int)y
424 /* this method is faster but won't work for bitmaps */
425 if (pixmapData[0] != NULL)
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]);
434 NSColor *color = [bmRep colorAtX: x y: y];
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));
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;
452 if (pixmapData[0] != NULL)
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;
463 [NSColor colorWithCalibratedRed: (r/255.0) green: (g/255.0)
464 blue: (b/255.0) alpha: (a/255.0)]
469 - (void) setAlphaAtX: (int) x Y: (int) y to: (unsigned char) a
474 if (pixmapData[0] != NULL)
476 int loc = x + y * [self size].width;
478 pixmapData[3][loc] = a;
482 NSColor *color = [bmRep colorAtX: x y: y];
483 color = [color colorWithAlphaComponent: (a / 255.0)];
484 [bmRep setColor: color atX: x y: y];
488 /* returns a pattern color, which is cached here */
489 - (NSColor *)stippleMask
491 if (stippleMask == nil)
492 stippleMask = [[NSColor colorWithPatternImage: self] retain];
498 // arch-tag: 6b310280-6892-4e5e-8f34-41c4d384874f