plan9port

fork of plan9port with libvec, libstr and libsdb
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gif.c (8948B)


      1 #include <u.h>
      2 #include <libc.h>
      3 #include <bio.h>
      4 #include <draw.h>
      5 #include <event.h>
      6 #include "imagefile.h"
      7 
      8 int		cflag = 0;
      9 int		dflag = 0;
     10 int		eflag = 0;
     11 int		nineflag = 0;
     12 int		threeflag = 0;
     13 int		output = 0;
     14 ulong	outchan = CMAP8;
     15 Image	**allims;
     16 Image	**allmasks;
     17 int		which;
     18 int		defaultcolor = 1;
     19 
     20 enum{
     21 	Border	= 2,
     22 	Edge		= 5
     23 };
     24 
     25 char	*show(int, char*);
     26 
     27 Rectangle
     28 imager(void)
     29 {
     30 	Rectangle r;
     31 
     32 	if(allims==nil || allims[0]==nil)
     33 		return screen->r;
     34 	r = insetrect(screen->clipr, Edge+Border);
     35 	r.max.x = r.min.x+Dx(allims[0]->r);
     36 	r.max.y = r.min.y+Dy(allims[0]->r);
     37 	return r;
     38 }
     39 
     40 void
     41 eresized(int new)
     42 {
     43 	Rectangle r;
     44 
     45 	if(new && getwindow(display, Refnone) < 0){
     46 		fprint(2, "gif: can't reattach to window\n");
     47 		exits("resize");
     48 	}
     49 	if(allims==nil || allims[which]==nil)
     50 		return;
     51 	r = rectaddpt(allims[0]->r, subpt(screen->r.min, allims[0]->r.min));
     52 	if(!new && !winsize)
     53 		drawresizewindow(r);
     54 	r = rectaddpt(r, subpt(allims[which]->r.min, allims[0]->r.min));
     55 	drawop(screen, r, allims[which], allmasks[which], allims[which]->r.min, S);
     56 	flushimage(display, 1);
     57 }
     58 
     59 void
     60 usage(void)
     61 {
     62 	fprint(2, "usage: gif -39cdektv -W winsize [file.gif ...]\n");
     63 	exits("usage");
     64 }
     65 
     66 
     67 void
     68 main(int argc, char *argv[])
     69 {
     70 	int fd, i;
     71 	char *err;
     72 
     73 	ARGBEGIN{
     74 	case 'W':
     75 		winsize = EARGF(usage());
     76 		break;
     77 	case '3':		/* produce encoded, compressed, three-color bitmap file; no display by default */
     78 		threeflag++;
     79 		/* fall through */
     80 	case 't':		/* produce encoded, compressed, true-color bitmap file; no display by default */
     81 		cflag++;
     82 		dflag++;
     83 		output++;
     84 		defaultcolor = 0;
     85 		outchan = RGB24;
     86 		break;
     87 	case 'c':		/* produce encoded, compressed, bitmap file; no display by default */
     88 		cflag++;
     89 		dflag++;
     90 		output++;
     91 		if(defaultcolor)
     92 			outchan = CMAP8;
     93 		break;
     94 	case 'd':		/* suppress display of image */
     95 		dflag++;
     96 		break;
     97 	case 'e':		/* disable floyd-steinberg error diffusion */
     98 		eflag++;
     99 		break;
    100 	case 'k':		/* force black and white */
    101 		defaultcolor = 0;
    102 		outchan = GREY8;
    103 		break;
    104 	case 'v':		/* force RGBV */
    105 		defaultcolor = 0;
    106 		outchan = CMAP8;
    107 		break;
    108 	case '9':		/* produce plan 9, uncompressed, bitmap file; no display by default */
    109 		nineflag++;
    110 		dflag++;
    111 		output++;
    112 		if(defaultcolor)
    113 			outchan = CMAP8;
    114 		break;
    115 	default:
    116 		usage();
    117 	}ARGEND;
    118 
    119 	err = nil;
    120 	if(argc == 0)
    121 		err = show(0, "<stdin>");
    122 	else{
    123 		for(i=0; i<argc; i++){
    124 			fd = open(argv[i], OREAD);
    125 			if(fd < 0){
    126 				fprint(2, "gif: can't open %s: %r\n", argv[i]);
    127 				err = "open";
    128 			}else{
    129 				err = show(fd, argv[i]);
    130 				close(fd);
    131 			}
    132 			if(output && argc>1 && err==nil){
    133 				fprint(2, "gif: exiting after one file\n");
    134 				break;
    135 			}
    136 		}
    137 	}
    138 	exits(err);
    139 }
    140 
    141 Image*
    142 transparency(Rawimage *r, char *name)
    143 {
    144 	Image *i;
    145 	int j, index;
    146 	uchar *pic, *mpic, *mask;
    147 
    148 	if((r->gifflags&TRANSP) == 0)
    149 		return nil;
    150 	i = allocimage(display, r->r, GREY8, 0, 0);
    151 	if(i == nil){
    152 		fprint(2, "gif: allocimage for mask of %s failed: %r\n", name);
    153 		return nil;
    154 	}
    155 	pic = r->chans[0];
    156 	mask = malloc(r->chanlen);
    157 	if(mask == nil){
    158 		fprint(2, "gif: malloc for mask of %s failed: %r\n", name);
    159 		freeimage(i);
    160 		return nil;
    161 	}
    162 	index = r->giftrindex;
    163 	mpic = mask;
    164 	for(j=0; j<r->chanlen; j++)
    165 		if(*pic++ == index)
    166 			*mpic++ = 0;
    167 		else
    168 			*mpic++ = 0xFF;
    169 	if(loadimage(i, i->r, mask, r->chanlen) < 0){
    170 		fprint(2, "gif: loadimage for mask of %s failed: %r\n", name);
    171 		free(mask);
    172 		freeimage(i);
    173 		return nil;
    174 	}
    175 	free(mask);
    176 	return i;
    177 }
    178 
    179 /* interleave alpha values of 0xFF in data stream. alpha value comes first, then b g r */
    180 uchar*
    181 expand(uchar *u, int chanlen, int nchan)
    182 {
    183 	int j, k;
    184 	uchar *v, *up, *vp;
    185 
    186 	v = malloc(chanlen*(nchan+1));
    187 	if(v == nil){
    188 		fprint(2, "gif: malloc fails: %r\n");
    189 		exits("malloc");
    190 	}
    191 	up = u;
    192 	vp = v;
    193 	for(j=0; j<chanlen; j++){
    194 		*vp++ = 0xFF;
    195 		for(k=0; k<nchan; k++)
    196 			*vp++ = *up++;
    197 	}
    198 	return v;
    199 }
    200 
    201 void
    202 addalpha(Rawimage *i)
    203 {
    204 	char buf[32];
    205 
    206 	switch(outchan){
    207 	case CMAP8:
    208 		i->chans[0] = expand(i->chans[0], i->chanlen/1, 1);
    209 		i->chanlen = 2*(i->chanlen/1);
    210 		i->chandesc = CRGBVA16;
    211 		outchan = CHAN2(CMap, 8, CAlpha, 8);
    212 		break;
    213 
    214 	case GREY8:
    215 		i->chans[0] = expand(i->chans[0], i->chanlen/1, 1);
    216 		i->chanlen = 2*(i->chanlen/1);
    217 		i->chandesc = CYA16;
    218 		outchan = CHAN2(CGrey, 8, CAlpha, 8);
    219 		break;
    220 
    221 	case RGB24:
    222 		i->chans[0] = expand(i->chans[0], i->chanlen/3, 3);
    223 		i->chanlen = 4*(i->chanlen/3);
    224 		i->chandesc = CRGBA32;
    225 		outchan = RGBA32;
    226 		break;
    227 
    228 	default:
    229 		chantostr(buf, outchan);
    230 		fprint(2, "gif: can't add alpha to type %s\n", buf);
    231 		exits("err");
    232 	}
    233 }
    234 
    235 /*
    236  * Called only when writing output.  If the output is RGBA32,
    237  * we must write four bytes per pixel instead of two.
    238  * There's always at least two: data plus alpha.
    239  * r is used only for reference; the image is already in c.
    240  */
    241 void
    242 blackout(Rawimage *r, Rawimage *c)
    243 {
    244 	int i, trindex;
    245 	uchar *rp, *cp;
    246 
    247 	rp = r->chans[0];
    248 	cp = c->chans[0];
    249 	trindex = r->giftrindex;
    250 	if(outchan == RGBA32)
    251 		for(i=0; i<r->chanlen; i++){
    252 			if(*rp == trindex){
    253 				*cp++ = 0x00;
    254 				*cp++ = 0x00;
    255 				*cp++ = 0x00;
    256 				*cp++ = 0x00;
    257 			}else{
    258 				*cp++ = 0xFF;
    259 				cp += 3;
    260 			}
    261 			rp++;
    262 		}
    263 	else
    264 		for(i=0; i<r->chanlen; i++){
    265 			if(*rp == trindex){
    266 				*cp++ = 0x00;
    267 				*cp++ = 0x00;
    268 			}else{
    269 				*cp++ = 0xFF;
    270 				cp++;
    271 			}
    272 			rp++;
    273 		}
    274 }
    275 
    276 int
    277 init(void)
    278 {
    279 	static int inited;
    280 
    281 	if(inited == 0){
    282 		if(initdraw(0, 0, 0) < 0){
    283 			fprint(2, "gif: initdraw failed: %r\n");
    284 			return -1;
    285 		}
    286 		einit(Ekeyboard|Emouse);
    287 		inited++;
    288 	}
    289 	return 1;
    290 }
    291 
    292 char*
    293 show(int fd, char *name)
    294 {
    295 	Rawimage **images, **rgbv;
    296 	Image **ims, **masks;
    297 	int j, k, n, ch, nloop, loopcount, dt;
    298 	char *err;
    299 	char buf[32];
    300 
    301 	err = nil;
    302 	images = readgif(fd, CRGB);
    303 	if(images == nil){
    304 		fprint(2, "gif: decode %s failed: %r\n", name);
    305 		return "decode";
    306 	}
    307 	for(n=0; images[n]; n++)
    308 		;
    309 	ims = malloc((n+1)*sizeof(Image*));
    310 	masks = malloc((n+1)*sizeof(Image*));
    311 	rgbv = malloc((n+1)*sizeof(Rawimage*));
    312 	if(masks==nil || rgbv==nil || ims==nil){
    313 		fprint(2, "gif: malloc of masks for %s failed: %r\n", name);
    314 		err = "malloc";
    315 		goto Return;
    316 	}
    317 	memset(masks, 0, (n+1)*sizeof(Image*));
    318 	memset(ims, 0, (n+1)*sizeof(Image*));
    319 	memset(rgbv, 0, (n+1)*sizeof(Rawimage*));
    320 	if(!dflag){
    321 		if(init() < 0){
    322 			err = "initdraw";
    323 			goto Return;
    324 		}
    325 		if(defaultcolor && screen->depth>8)
    326 			outchan = RGB24;
    327 	}
    328 
    329 	for(k=0; k<n; k++){
    330 		if(outchan == CMAP8)
    331 			rgbv[k] = torgbv(images[k], !eflag);
    332 		else{
    333 			if(outchan==GREY8 || (images[k]->chandesc==CY && threeflag==0))
    334 				rgbv[k] = totruecolor(images[k], CY);
    335 			else
    336 				rgbv[k] = totruecolor(images[k], CRGB24);
    337 		}
    338 		if(rgbv[k] == nil){
    339 			fprint(2, "gif: converting %s to local format failed: %r\n", name);
    340 			err = "torgbv";
    341 			goto Return;
    342 		}
    343 		if(!dflag){
    344 			masks[k] = transparency(images[k], name);
    345 			if(rgbv[k]->chandesc == CY)
    346 				ims[k] = allocimage(display, rgbv[k]->r, GREY8, 0, 0);
    347 			else
    348 				ims[k] = allocimage(display, rgbv[k]->r, outchan, 0, 0);
    349 			if(ims[k] == nil){
    350 				fprint(2, "gif: allocimage %s failed: %r\n", name);
    351 				err = "allocimage";
    352 				goto Return;
    353 			}
    354 			if(loadimage(ims[k], ims[k]->r, rgbv[k]->chans[0], rgbv[k]->chanlen) < 0){
    355 				fprint(2, "gif: loadimage %s failed: %r\n", name);
    356 				err = "loadimage";
    357 				goto Return;
    358 			}
    359 		}
    360 	}
    361 
    362 	allims = ims;
    363 	allmasks = masks;
    364 	loopcount = images[0]->gifloopcount;
    365 	if(!dflag){
    366 		nloop = 0;
    367 		do{
    368 			for(k=0; k<n; k++){
    369 				which = k;
    370 				eresized(0);
    371 				dt = images[k]->gifdelay*10;
    372 				if(dt < 50)
    373 					dt = 50;
    374 				while(n==1 || ecankbd()){
    375 					if((ch=ekbd())=='q' || ch==0x7F || ch==0x04)	/* an odd, democratic list */
    376 						exits(nil);
    377 					if(ch == '\n')
    378 						goto Out;
    379 				}sleep(dt);
    380 			}
    381 			/* loopcount -1 means no loop (this code's rule), loopcount 0 means loop forever (netscape's rule)*/
    382 		}while(loopcount==0 || ++nloop<loopcount);
    383 		/* loop count has run out */
    384 		ekbd();
    385     Out:
    386 		drawop(screen, screen->clipr, display->white, nil, ZP, S);
    387 	}
    388 	if(n>1 && output)
    389 		fprint(2, "gif: warning: only writing first image in %d-image GIF %s\n", n, name);
    390 	if(nineflag){
    391 		if(images[0]->gifflags&TRANSP){
    392 			addalpha(rgbv[0]);
    393 			blackout(images[0], rgbv[0]);
    394 		}
    395 		chantostr(buf, outchan);
    396 		print("%11s %11d %11d %11d %11d ", buf,
    397 			rgbv[0]->r.min.x, rgbv[0]->r.min.y, rgbv[0]->r.max.x, rgbv[0]->r.max.y);
    398 		if(write(1, rgbv[0]->chans[0], rgbv[0]->chanlen) != rgbv[0]->chanlen){
    399 			fprint(2, "gif: %s: write error %r\n", name);
    400 			return "write";
    401 		}
    402 	}else if(cflag){
    403 		if(images[0]->gifflags&TRANSP){
    404 			addalpha(rgbv[0]);
    405 			blackout(images[0], rgbv[0]);
    406 		}
    407 		if(writerawimage(1, rgbv[0]) < 0){
    408 			fprint(2, "gif: %s: write error: %r\n", name);
    409 			return "write";
    410 		}
    411 	}
    412 
    413     Return:
    414 	allims = nil;
    415 	allmasks = nil;
    416 	for(k=0; images[k]; k++){
    417 		for(j=0; j<images[k]->nchans; j++)
    418 			free(images[k]->chans[j]);
    419 		free(images[k]->cmap);
    420 		if(rgbv[k])
    421 			free(rgbv[k]->chans[0]);
    422 		freeimage(ims[k]);
    423 		freeimage(masks[k]);
    424 		free(images[k]);
    425 		free(rgbv[k]);
    426 	}
    427 	free(images);
    428 	free(masks);
    429 	free(ims);
    430 	return err;
    431 }