xref: /plan9/sys/src/cmd/jpg/png.c (revision 43aadf5e5598b9159a98f64e309c3ae860328a56)
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 extern int	debug;
9 int	cflag = 0;
10 int	dflag = 0;
11 int	eflag = 0;
12 int	nineflag = 0;
13 int	threeflag = 0;
14 int	colorspace = CRGB;
15 int	output = 0;
16 ulong	outchan = CMAP8;
17 Image	*image;
18 int	defaultcolor = 1;
19 
20 enum{
21 	Border	= 2,
22 	Edge	= 5
23 };
24 
25 char	*show(int, char*, int);
26 
27 void
eresized(int new)28 eresized(int new)
29 {
30 	Rectangle r;
31 
32 	if(new && getwindow(display, Refnone) < 0){
33 		fprint(2, "png: can't reattach to window\n");
34 		exits("resize");
35 	}
36 	if(image == nil)
37 		return;
38 	r = insetrect(screen->clipr, Edge+Border);
39 	r.max.x = r.min.x+Dx(image->r);
40 	r.max.y = r.min.y+Dy(image->r);
41 	border(screen, r, -Border, nil, ZP);
42 	draw(screen, r, image, nil, image->r.min);
43 	flushimage(display, 1);
44 }
45 
46 void
main(int argc,char * argv[])47 main(int argc, char *argv[])
48 {
49 	int fd, i;
50 	char *err;
51 	char buf[12+1];
52 
53 	ARGBEGIN{
54 	case 'c':		/* produce encoded, compressed, bitmap file; no display by default */
55 		cflag++;
56 		dflag++;
57 		output++;
58 		if(defaultcolor)
59 			outchan = CMAP8;
60 		break;
61 	case 'D':
62 		debug++;
63 		break;
64 	case 'd':		/* suppress display of image */
65 		dflag++;
66 		break;
67 	case 'e':		/* disable floyd-steinberg error diffusion */
68 		eflag++;
69 		break;
70 	case 'k':		/* force black and white */
71 		defaultcolor = 0;
72 		outchan = GREY8;
73 		break;
74 	case 'r':
75 		colorspace = CRGB;
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 'v':		/* force RGBV */
88 		defaultcolor = 0;
89 		outchan = CMAP8;
90 		break;
91 	case '9':		/* produce plan 9, uncompressed, bitmap file; no display by default */
92 		nineflag++;
93 		dflag++;
94 		output++;
95 		if(defaultcolor)
96 			outchan = CMAP8;
97 		break;
98 	default:
99 		fprint(2, "usage: png [-39cdekrtv] [file.png ...]\n");
100 		exits("usage");
101 	}ARGEND;
102 
103 	if(dflag==0 && colorspace==CYCbCr){	/* see if we should convert right to RGB */
104 		fd = open("/dev/screen", OREAD);
105 		if(fd > 0){
106 			buf[12] = '\0';
107 			if(read(fd, buf, 12)==12 && chantodepth(strtochan(buf))>8)
108 				colorspace = CRGB;
109 			close(fd);
110 		}
111 	}
112 
113 	err = nil;
114 	if(argc == 0)
115 		err = show(0, "<stdin>", outchan);
116 	else{
117 		for(i=0; i<argc; i++){
118 			fd = open(argv[i], OREAD);
119 			if(fd < 0){
120 				fprint(2, "png: can't open %s: %r\n", argv[i]);
121 				err = "open";
122 			}else{
123 				err = show(fd, argv[i], outchan);
124 				close(fd);
125 			}
126 			if((nineflag || cflag) && argc>1 && err==nil){
127 				fprint(2, "png: exiting after one file\n");
128 				break;
129 			}
130 		}
131 	}
132 	exits(err);
133 }
134 
135 char*
show(int fd,char * name,int outc)136 show(int fd, char *name, int outc)
137 {
138 	Rawimage **array, *r, *c;
139 	Image *i, *i2;
140 	int j, ch, outchan;
141 	long len;
142 	Biobuf b;
143 	char buf[32];
144 	static int inited;
145 
146 	if(Binit(&b, fd, OREAD) < 0)
147 		return nil;
148 	outchan = outc;
149 	array = Breadpng(&b, colorspace);
150 	if(array == nil || array[0]==nil){
151 		fprint(2, "png: decode %s failed: %r\n", name);
152 		return "decode";
153 	}
154 	Bterm(&b);
155 
156 	r = array[0];
157 	if(!dflag){
158 		if (!inited) {
159 			if(initdraw(0, 0, 0) < 0){
160 				fprint(2, "png: initdraw failed: %r\n");
161 				return "initdraw";
162 			}
163 			einit(Ekeyboard|Emouse);
164 			inited++;
165 		}
166 		if(defaultcolor && screen->depth>8 && outchan==CMAP8)
167 			outchan = RGB24;
168 	}
169 	if(outchan == CMAP8)
170 		c = torgbv(r, !eflag);
171 	else{
172 		switch(r->chandesc){
173 		case CY:
174 			outchan = GREY8;
175 			break;
176 		case CYA16:
177 			outchan = CHAN2(CGrey, 8, CAlpha, 8);
178 			break;
179 		case CRGB24:
180 			outchan = RGB24;
181 			break;
182 		case CRGBA32:
183 			outchan = RGBA32;
184 			break;
185 		}
186 		c = r;
187 	}
188 	if(c == nil){
189 		fprint(2, "png: conversion of %s failed: %r\n", name);
190 		return "torgbv";
191 	}
192 	if(!dflag){
193 		i = allocimage(display, c->r, outchan, 0, 0);
194 		if(i == nil){
195 			fprint(2, "png: allocimage %s failed: %r\n", name);
196 			return "allocimage";
197 		}
198 		if(loadimage(i, i->r, c->chans[0], c->chanlen) < 0){
199 			fprint(2, "png: loadimage %s of %d bytes failed: %r\n",
200 				name, c->chanlen);
201 			return "loadimage";
202 		}
203 		i2 = allocimage(display, c->r, outchan, 0, 0);
204 		draw(i2, i2->r, display->black, nil, ZP);
205 		draw(i2, i2->r, i, nil, i->r.min);
206 		image = i2;
207 		eresized(0);
208 		if((ch=ekbd())=='q' || ch==0x7F || ch==0x04)
209 			exits(nil);
210 		draw(screen, screen->clipr, display->white, nil, ZP);
211 		image = nil;
212 		freeimage(i);
213 	}
214 	if(nineflag){
215 		chantostr(buf, outchan);
216 		len = (c->r.max.x - c->r.min.x) * (c->r.max.y - c->r.min.y);
217 		switch(c->chandesc){
218 		case CY:
219 			// len *= 1;
220 			break;
221 		case CYA16:
222 			len *= 2;
223 			break;
224 		case CRGB24:
225 			len *= 3;
226 			break;
227 		case CRGBA32:
228 			len *= 4;
229 			break;
230 		}
231 		if(c->chanlen != len)
232 			fprint(2, "%s: writing %d bytes for len %ld chan %s\n",
233 				argv0, c->chanlen, len, buf);
234 		print("%11s %11d %11d %11d %11d ", buf,
235 			c->r.min.x, c->r.min.y, c->r.max.x, c->r.max.y);
236 		if(write(1, c->chans[0], c->chanlen) != c->chanlen){
237 			fprint(2, "png: %s: write error %r\n", name);
238 			return "write";
239 		}
240 	}else if(cflag){
241 		if(writerawimage(1, c) < 0){
242 			fprint(2, "png: %s: write error: %r\n", name);
243 			return "write";
244 		}
245 	}
246 	for(j=0; j<r->nchans; j++)
247 		free(r->chans[j]);
248 	free(r->cmap);
249 	free(r);
250 	free(array);
251 	if(c && c != r){
252 		free(c->chans[0]);
253 		free(c);
254 	}
255 	return nil;
256 }
257