1 /* Image support for the NeXT/Open/GNUstep and MacOSX window system.
2 Copyright (C) 1989, 1992-1994, 2005-2006, 2008-2015 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"
39 int image_trace_num = 0;
40 #define NSTRACE(x) fprintf (stderr, "%s:%d: [%d] " #x "\n", \
41 __FILE__, __LINE__, ++image_trace_num)
47 /* ==========================================================================
49 C interface. This allows easy calling from C files. We could just
50 compile everything as Objective-C, but that might mean slower
51 compilation and possible difficulties on some platforms..
53 ========================================================================== */
56 ns_image_from_XBM (unsigned char *bits, int width, int height)
58 NSTRACE (ns_image_from_XBM);
59 return [[EmacsImage alloc] initFromXBM: bits
60 width: width height: height
65 ns_image_for_XPM (int width, int height, int depth)
67 NSTRACE (ns_image_for_XPM);
68 return [[EmacsImage alloc] initForXPMWithDepth: depth
69 width: width height: height];
73 ns_image_from_file (Lisp_Object file)
75 NSTRACE (ns_image_from_bitmap_file);
76 return [EmacsImage allocInitFromFile: file];
80 ns_load_image (struct frame *f, struct image *img,
81 Lisp_Object spec_file, Lisp_Object spec_data)
83 EmacsImage *eImg = nil;
86 NSTRACE (ns_load_image);
88 if (STRINGP (spec_file))
90 eImg = [EmacsImage allocInitFromFile: spec_file];
92 else if (STRINGP (spec_data))
96 data = [NSData dataWithBytes: SSDATA (spec_data)
97 length: SBYTES (spec_data)];
98 eImg = [[EmacsImage alloc] initWithData: data];
104 add_to_log ("Unable to load image %s", img->spec, Qnil);
109 img->width = size.width;
110 img->height = size.height;
112 /* 4) set img->pixmap = emacsimage */
119 ns_image_width (void *img)
121 return [(id)img size].width;
125 ns_image_height (void *img)
127 return [(id)img size].height;
131 ns_get_pixel (void *img, int x, int y)
133 return [(EmacsImage *)img getPixelAtX: x Y: y];
137 ns_put_pixel (void *img, int x, int y, unsigned long argb)
139 unsigned char alpha = (argb >> 24) & 0xFF;
142 [(EmacsImage *)img setPixelAtX: x Y: y toRed: (argb >> 16) & 0xFF
143 green: (argb >> 8) & 0xFF blue: (argb & 0xFF) alpha: alpha];
147 ns_set_alpha (void *img, int x, int y, unsigned char a)
149 [(EmacsImage *)img setAlphaAtX: x Y: y to: a];
153 /* ==========================================================================
155 Class supporting bitmaps and images of various sorts.
157 ========================================================================== */
159 @implementation EmacsImage
161 + allocInitFromFile: (Lisp_Object)file
167 /* Search bitmap-file-path for the file, if appropriate. */
168 found = x_find_image_file (file);
169 if (!STRINGP (found))
172 image = [[EmacsImage alloc] initByReferencingFile:
173 [NSString stringWithUTF8String: SSDATA (found)]];
177 imgRep = [NSBitmapImageRep imageRepWithData:[image TIFFRepresentation]];
179 imgRep = [image bestRepresentationForDevice: nil];
187 /* The next two lines cause the DPI of the image to be ignored.
188 This seems to be the behavior users expect. */
189 [image setScalesWhenResized: YES];
190 [image setSize: NSMakeSize([imgRep pixelsWide], [imgRep pixelsHigh])];
192 [image setName: [NSString stringWithUTF8String: SSDATA (file)]];
200 [stippleMask release];
206 - initFromXBM: (unsigned char *)bits width: (int)w height: (int)h
209 return [self initFromSkipXBM: bits width: w height: h flip: flip length: 0];
213 - initFromSkipXBM: (unsigned char *)bits width: (int)w height: (int)h
214 flip: (BOOL)flip length: (int)length;
216 int bpr = (w + 7) / 8;
217 unsigned char *planes[5];
219 [self initWithSize: NSMakeSize (w, h)];
221 bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
222 pixelsWide: w pixelsHigh: h
223 bitsPerSample: 8 samplesPerPixel: 4
224 hasAlpha: YES isPlanar: YES
225 colorSpaceName: NSCalibratedRGBColorSpace
226 bytesPerRow: w bitsPerPixel: 0];
228 [bmRep getBitmapDataPlanes: planes];
230 /* pull bits out to set the (bytewise) alpha mask */
232 unsigned char *s = bits;
233 unsigned char *alpha = planes[3];
234 unsigned char swt[16] = {0, 8, 4, 12, 2, 10, 6, 14, 1, 9, 5, 13,
236 unsigned char c, bitPat;
238 for (j = 0; j < h; j++)
239 for (i = 0; i < bpr; i++)
243 unsigned char s1, s2;
244 while (*s++ != 'x' && s < bits + length);
245 if (s >= bits + length)
251 #define hexchar(x) ('0' <= (x) && (x) <= '9' ? (x) - '0' : (x) - 'a' + 10)
254 c = hexchar (s1) * 0x10 + hexchar (s2);
259 bitPat = flip ? swt[c >> 4] | (swt[c & 0xf] << 4) : c ^ 255;
262 *alpha++ = (bitPat & 0x80) ? 0xff : 0;
268 [self addRepresentation: bmRep];
270 memset (planes[0], 0, w*h);
271 memset (planes[1], 0, w*h);
272 memset (planes[2], 0, w*h);
273 [self setXBMColor: [NSColor blackColor]];
278 /* Set color for a bitmap image (see initFromSkipXBM). Note that the alpha
279 is used as a mask, so we just memset the entire array. */
280 - setXBMColor: (NSColor *)color
282 NSSize s = [self size];
283 unsigned char *planes[5];
284 EmacsCGFloat r, g, b, a;
287 if (bmRep == nil || color == nil)
290 if ([color colorSpaceName] != NSCalibratedRGBColorSpace)
291 rgbColor = [color colorUsingColorSpaceName: NSCalibratedRGBColorSpace];
295 [rgbColor getRed: &r green: &g blue: &b alpha: &a];
297 [bmRep getBitmapDataPlanes: planes];
299 /* we used to just do this, but Cocoa seems to have a bug when rendering
300 an alpha-masked image onto a dark background where it bloats the mask */
301 /* memset (planes[0..2], r, g, b*0xff, len); */
303 int i, len = s.width*s.height;
304 int rr = r * 0xff, gg = g * 0xff, bb = b * 0xff;
305 for (i =0; i<len; i++)
306 if (planes[3][i] != 0)
318 - initForXPMWithDepth: (int)depth width: (int)width height: (int)height
320 NSSize s = {width, height};
323 [self initWithSize: s];
325 bmRep = [[NSBitmapImageRep alloc] initWithBitmapDataPlanes: NULL
326 pixelsWide: width pixelsHigh: height
327 /* keep things simple for now */
328 bitsPerSample: 8 samplesPerPixel: 4 /*RGB+A*/
329 hasAlpha: YES isPlanar: YES
330 colorSpaceName: NSCalibratedRGBColorSpace
331 bytesPerRow: width bitsPerPixel: 0];
333 [bmRep getBitmapDataPlanes: pixmapData];
335 memset (pixmapData[i], 0, width*height);
336 [self addRepresentation: bmRep];
341 /* attempt to pull out pixmap data from a BitmapImageRep; returns NO if fails */
342 - (void) setPixmapData
347 reps = [[self representations] objectEnumerator];
348 while ((rep = (NSImageRep *) [reps nextObject]))
350 if ([rep respondsToSelector: @selector (getBitmapDataPlanes:)])
352 NSBitmapImageRep *bmr = (NSBitmapImageRep *) rep;
354 if ([bmr numberOfPlanes] >= 3)
355 [bmr getBitmapDataPlanes: pixmapData];
357 /* The next two lines cause the DPI of the image to be ignored.
358 This seems to be the behavior users expect. */
359 [self setScalesWhenResized: YES];
360 [self setSize: NSMakeSize([bmr pixelsWide], [bmr pixelsHigh])];
368 /* note; this and next work only for image created with initForXPMWithDepth,
369 initFromSkipXBM, or where setPixmapData was called successfully */
371 - (unsigned long) getPixelAtX: (int)x Y: (int)y
376 /* this method is faster but won't work for bitmaps */
377 if (pixmapData[0] != NULL)
379 int loc = x + y * [self size].width;
380 return (pixmapData[3][loc] << 24) /* alpha */
381 | (pixmapData[0][loc] << 16) | (pixmapData[1][loc] << 8)
382 | (pixmapData[2][loc]);
386 NSColor *color = [bmRep colorAtX: x y: y];
387 EmacsCGFloat r, g, b, a;
388 [color getRed: &r green: &g blue: &b alpha: &a];
389 return ((int)(a * 255.0) << 24)
390 | ((int)(r * 255.0) << 16) | ((int)(g * 255.0) << 8)
391 | ((int)(b * 255.0));
396 - (void) setPixelAtX: (int)x Y: (int)y toRed: (unsigned char)r
397 green: (unsigned char)g blue: (unsigned char)b
398 alpha:(unsigned char)a;
403 if (pixmapData[0] != NULL)
405 int loc = x + y * [self size].width;
406 pixmapData[0][loc] = r;
407 pixmapData[1][loc] = g;
408 pixmapData[2][loc] = b;
409 pixmapData[3][loc] = a;
414 [NSColor colorWithCalibratedRed: (r/255.0) green: (g/255.0)
415 blue: (b/255.0) alpha: (a/255.0)]
420 - (void) setAlphaAtX: (int) x Y: (int) y to: (unsigned char) a
425 if (pixmapData[0] != NULL)
427 int loc = x + y * [self size].width;
429 pixmapData[3][loc] = a;
433 NSColor *color = [bmRep colorAtX: x y: y];
434 color = [color colorWithAlphaComponent: (a / 255.0)];
435 [bmRep setColor: color atX: x y: y];
439 /* returns a pattern color, which is cached here */
440 - (NSColor *)stippleMask
442 if (stippleMask == nil)
443 stippleMask = [[NSColor colorWithPatternImage: self] retain];