1 f2887b9d 2009-08-11 rsc #include <u.h>
  2 f2887b9d 2009-08-11 rsc #include <libc.h>
  3 f2887b9d 2009-08-11 rsc #include <draw.h>
  4 f2887b9d 2009-08-11 rsc #include <cursor.h>
  5 f2887b9d 2009-08-11 rsc #include <event.h>
  6 f2887b9d 2009-08-11 rsc #include <bio.h>
  7 f2887b9d 2009-08-11 rsc #include <plumb.h>
  8 f2887b9d 2009-08-11 rsc #include <ctype.h>
  9 f2887b9d 2009-08-11 rsc #include <keyboard.h>
 10 f2887b9d 2009-08-11 rsc #include <thread.h>
 11 f2887b9d 2009-08-11 rsc #include "page.h"
 12 f2887b9d 2009-08-11 rsc 
 13 f2887b9d 2009-08-11 rsc typedef struct Cached Cached;
 14 f2887b9d 2009-08-11 rsc struct Cached
 15 f2887b9d 2009-08-11 rsc {
 16 f2887b9d 2009-08-11 rsc 	Document *doc;
 17 f2887b9d 2009-08-11 rsc 	int page;
 18 f2887b9d 2009-08-11 rsc 	int angle;
 19 f2887b9d 2009-08-11 rsc 	Image *im;
 20 d9e047e5 2010-02-04 rsc 	int ppi;
 21 f2887b9d 2009-08-11 rsc };
 22 f2887b9d 2009-08-11 rsc 
 23 f2887b9d 2009-08-11 rsc static Cached cache[5];
 24 f2887b9d 2009-08-11 rsc static int rabusy;
 25 f2887b9d 2009-08-11 rsc 
 26 f2887b9d 2009-08-11 rsc static Image*
 27 f2887b9d 2009-08-11 rsc questionmark(void)
 28 f2887b9d 2009-08-11 rsc {
 29 f2887b9d 2009-08-11 rsc 	static Image *im;
 30 f2887b9d 2009-08-11 rsc 
 31 f2887b9d 2009-08-11 rsc 	if(im)
 32 fa325e9b 2020-01-10 cross 		return im;
 33 f2887b9d 2009-08-11 rsc 	im = xallocimage(display, Rect(0,0,50,50), GREY1, 1, DBlack);
 34 f2887b9d 2009-08-11 rsc 	if(im == nil)
 35 f2887b9d 2009-08-11 rsc 		return nil;
 36 f2887b9d 2009-08-11 rsc 	string(im, ZP, display->white, ZP, display->defaultfont, "?");
 37 f2887b9d 2009-08-11 rsc 	return im;
 38 f2887b9d 2009-08-11 rsc }
 39 f2887b9d 2009-08-11 rsc 
 40 f2887b9d 2009-08-11 rsc void
 41 f2887b9d 2009-08-11 rsc cacheflush(void)
 42 f2887b9d 2009-08-11 rsc {
 43 f2887b9d 2009-08-11 rsc 	int i;
 44 f2887b9d 2009-08-11 rsc 	Cached *c;
 45 f2887b9d 2009-08-11 rsc 
 46 f2887b9d 2009-08-11 rsc 	for(i=0; i<nelem(cache); i++){
 47 f2887b9d 2009-08-11 rsc 		c = &cache[i];
 48 f2887b9d 2009-08-11 rsc 		if(c->im)
 49 f2887b9d 2009-08-11 rsc 			freeimage(c->im);
 50 f2887b9d 2009-08-11 rsc 		c->im = nil;
 51 f2887b9d 2009-08-11 rsc 		c->doc = nil;
 52 f2887b9d 2009-08-11 rsc 	}
 53 f2887b9d 2009-08-11 rsc }
 54 f2887b9d 2009-08-11 rsc 
 55 f2887b9d 2009-08-11 rsc static Image*
 56 f2887b9d 2009-08-11 rsc _cachedpage(Document *doc, int angle, int page, char *ra)
 57 f2887b9d 2009-08-11 rsc {
 58 f2887b9d 2009-08-11 rsc 	int i;
 59 f2887b9d 2009-08-11 rsc 	Cached *c, old;
 60 f2887b9d 2009-08-11 rsc 	Image *im, *tmp;
 61 d9e047e5 2010-02-04 rsc 	int ppi = 100;
 62 d9e047e5 2010-02-04 rsc 	PDFInfo *pdf;
 63 d9e047e5 2010-02-04 rsc 	PSInfo *ps;
 64 f2887b9d 2009-08-11 rsc 
 65 f2887b9d 2009-08-11 rsc 	if((page < 0 || page >= doc->npage) && !doc->fwdonly)
 66 f2887b9d 2009-08-11 rsc 		return nil;
 67 f2887b9d 2009-08-11 rsc 
 68 d9e047e5 2010-02-04 rsc 	if (doc->type == Tpdf){
 69 d9e047e5 2010-02-04 rsc 		pdf = (PDFInfo *) doc->extra;
 70 d9e047e5 2010-02-04 rsc 		ppi = pdf->gs.ppi;
 71 d9e047e5 2010-02-04 rsc 	}
 72 d9e047e5 2010-02-04 rsc 	else{
 73 d9e047e5 2010-02-04 rsc 		if (doc->type == Tps){
 74 d9e047e5 2010-02-04 rsc 			ps = (PSInfo *) doc->extra;
 75 d9e047e5 2010-02-04 rsc 			ppi = ps->gs.ppi;
 76 d9e047e5 2010-02-04 rsc 		}
 77 d9e047e5 2010-02-04 rsc 	}
 78 d9e047e5 2010-02-04 rsc 
 79 f2887b9d 2009-08-11 rsc Again:
 80 f2887b9d 2009-08-11 rsc 	for(i=0; i<nelem(cache); i++){
 81 f2887b9d 2009-08-11 rsc 		c = &cache[i];
 82 d9e047e5 2010-02-04 rsc 		if(c->doc == doc && c->angle == angle && c->page == page && c->ppi == ppi){
 83 f2887b9d 2009-08-11 rsc 			if(chatty) fprint(2, "cache%s hit %d\n", ra, page);
 84 f2887b9d 2009-08-11 rsc 			goto Found;
 85 f2887b9d 2009-08-11 rsc 		}
 86 f2887b9d 2009-08-11 rsc 		if(c->doc == nil)
 87 f2887b9d 2009-08-11 rsc 			break;
 88 f2887b9d 2009-08-11 rsc 	}
 89 f2887b9d 2009-08-11 rsc 
 90 f2887b9d 2009-08-11 rsc 	if(i >= nelem(cache))
 91 f2887b9d 2009-08-11 rsc 		i = nelem(cache)-1;
 92 f2887b9d 2009-08-11 rsc 	c = &cache[i];
 93 f2887b9d 2009-08-11 rsc 	if(c->im)
 94 f2887b9d 2009-08-11 rsc 		freeimage(c->im);
 95 f2887b9d 2009-08-11 rsc 	c->im = nil;
 96 f2887b9d 2009-08-11 rsc 	c->doc = nil;
 97 f2887b9d 2009-08-11 rsc 	c->page = -1;
 98 d9e047e5 2010-02-04 rsc 	c->ppi = -1;
 99 f2887b9d 2009-08-11 rsc 
100 f2887b9d 2009-08-11 rsc 	if(chatty) fprint(2, "cache%s load %d\n", ra, page);
101 f2887b9d 2009-08-11 rsc 	im = doc->drawpage(doc, page);
102 f2887b9d 2009-08-11 rsc 	if(im == nil){
103 f2887b9d 2009-08-11 rsc 		if(doc->fwdonly)	/* end of file */
104 f2887b9d 2009-08-11 rsc 			wexits(0);
105 f2887b9d 2009-08-11 rsc 		im = questionmark();
106 f2887b9d 2009-08-11 rsc 		if(im == nil){
107 f2887b9d 2009-08-11 rsc 		Flush:
108 f2887b9d 2009-08-11 rsc 			if(i > 0){
109 f2887b9d 2009-08-11 rsc 				cacheflush();
110 f2887b9d 2009-08-11 rsc 				goto Again;
111 f2887b9d 2009-08-11 rsc 			}
112 f2887b9d 2009-08-11 rsc 			fprint(2, "out of memory: %r\n");
113 f2887b9d 2009-08-11 rsc 			wexits("memory");
114 f2887b9d 2009-08-11 rsc 		}
115 f2887b9d 2009-08-11 rsc 		return im;
116 f2887b9d 2009-08-11 rsc 	}
117 f2887b9d 2009-08-11 rsc 
118 f2887b9d 2009-08-11 rsc 	if(im->r.min.x != 0 || im->r.min.y != 0){
119 f2887b9d 2009-08-11 rsc 		/* translate to 0,0 */
120 f2887b9d 2009-08-11 rsc 		tmp = xallocimage(display, Rect(0, 0, Dx(im->r), Dy(im->r)), im->chan, 0, DNofill);
121 f2887b9d 2009-08-11 rsc 		if(tmp == nil){
122 f2887b9d 2009-08-11 rsc 			freeimage(im);
123 f2887b9d 2009-08-11 rsc 			goto Flush;
124 f2887b9d 2009-08-11 rsc 		}
125 f2887b9d 2009-08-11 rsc 		drawop(tmp, tmp->r, im, nil, im->r.min, S);
126 f2887b9d 2009-08-11 rsc 		freeimage(im);
127 f2887b9d 2009-08-11 rsc 		im = tmp;
128 f2887b9d 2009-08-11 rsc 	}
129 f2887b9d 2009-08-11 rsc 
130 f2887b9d 2009-08-11 rsc 	switch(angle){
131 f2887b9d 2009-08-11 rsc 	case 90:
132 f2887b9d 2009-08-11 rsc 		im = rot90(im);
133 f2887b9d 2009-08-11 rsc 		break;
134 f2887b9d 2009-08-11 rsc 	case 180:
135 f2887b9d 2009-08-11 rsc 		rot180(im);
136 f2887b9d 2009-08-11 rsc 		break;
137 f2887b9d 2009-08-11 rsc 	case 270:
138 f2887b9d 2009-08-11 rsc 		im = rot270(im);
139 f2887b9d 2009-08-11 rsc 		break;
140 f2887b9d 2009-08-11 rsc 	}
141 f2887b9d 2009-08-11 rsc 	if(im == nil)
142 f2887b9d 2009-08-11 rsc 		goto Flush;
143 f2887b9d 2009-08-11 rsc 
144 f2887b9d 2009-08-11 rsc 	c->doc = doc;
145 f2887b9d 2009-08-11 rsc 	c->page = page;
146 f2887b9d 2009-08-11 rsc 	c->angle = angle;
147 f2887b9d 2009-08-11 rsc 	c->im = im;
148 d9e047e5 2010-02-04 rsc 	c->ppi = ppi;
149 f2887b9d 2009-08-11 rsc 
150 f2887b9d 2009-08-11 rsc Found:
151 f2887b9d 2009-08-11 rsc 	if(chatty) fprint(2, "cache%s mtf %d @%d:", ra, c->page, i);
152 f2887b9d 2009-08-11 rsc 	old = *c;
153 f2887b9d 2009-08-11 rsc 	memmove(cache+1, cache, (c-cache)*sizeof cache[0]);
154 f2887b9d 2009-08-11 rsc 	cache[0] = old;
155 f2887b9d 2009-08-11 rsc 	if(chatty){
156 f2887b9d 2009-08-11 rsc 		for(i=0; i<nelem(cache); i++)
157 f2887b9d 2009-08-11 rsc 			fprint(2, " %d", cache[i].page);
158 f2887b9d 2009-08-11 rsc 		fprint(2, "\n");
159 f2887b9d 2009-08-11 rsc 	}
160 f2887b9d 2009-08-11 rsc 	if(chatty) fprint(2, "cache%s return %d %p\n", ra, old.page, old.im);
161 f2887b9d 2009-08-11 rsc 	return old.im;
162 f2887b9d 2009-08-11 rsc }
163 f2887b9d 2009-08-11 rsc 
164 f2887b9d 2009-08-11 rsc static void
165 f2887b9d 2009-08-11 rsc raproc(void *a)
166 f2887b9d 2009-08-11 rsc {
167 f2887b9d 2009-08-11 rsc 	Cached *c;
168 fa325e9b 2020-01-10 cross 
169 f2887b9d 2009-08-11 rsc 	c = a;
170 f2887b9d 2009-08-11 rsc 	lockdisplay(display);
171 46606276 2019-11-14 crossd 	/*
172 46606276 2019-11-14 crossd 	 * If there is only one page in a fwdonly file, we may reach EOF
173 46606276 2019-11-14 crossd 	 * while doing readahead and page will exit without showing anything.
174 46606276 2019-11-14 crossd 	 */
175 46606276 2019-11-14 crossd 	if(!c->doc->fwdonly)
176 46606276 2019-11-14 crossd 		_cachedpage(c->doc, c->angle, c->page, "-ra");
177 f2887b9d 2009-08-11 rsc 	rabusy = 0;
178 f2887b9d 2009-08-11 rsc 	unlockdisplay(display);
179 f2887b9d 2009-08-11 rsc 	free(c);
180 f2887b9d 2009-08-11 rsc 	threadexits(0);
181 f2887b9d 2009-08-11 rsc }
182 f2887b9d 2009-08-11 rsc 
183 f2887b9d 2009-08-11 rsc Image*
184 f2887b9d 2009-08-11 rsc cachedpage(Document *doc, int angle, int page)
185 f2887b9d 2009-08-11 rsc {
186 f2887b9d 2009-08-11 rsc 	static int lastpage = -1;
187 f2887b9d 2009-08-11 rsc 	Cached *c;
188 f2887b9d 2009-08-11 rsc 	Image *im;
189 f2887b9d 2009-08-11 rsc 	int ra;
190 fa325e9b 2020-01-10 cross 
191 f2887b9d 2009-08-11 rsc 	if(doc->npage < 1)
192 f2887b9d 2009-08-11 rsc 		return display->white;
193 f2887b9d 2009-08-11 rsc 
194 f2887b9d 2009-08-11 rsc 	im = _cachedpage(doc, angle, page, "");
195 f2887b9d 2009-08-11 rsc 	if(im == nil)
196 f2887b9d 2009-08-11 rsc 		return nil;
197 f2887b9d 2009-08-11 rsc 
198 f2887b9d 2009-08-11 rsc 	/* readahead */
199 f2887b9d 2009-08-11 rsc 	ra = -1;
200 f2887b9d 2009-08-11 rsc 	if(!rabusy){
201 f2887b9d 2009-08-11 rsc 		if(page == lastpage+1)
202 f2887b9d 2009-08-11 rsc 			ra = page+1;
203 f2887b9d 2009-08-11 rsc 		else if(page == lastpage-1)
204 f2887b9d 2009-08-11 rsc 			ra = page-1;
205 f2887b9d 2009-08-11 rsc 	}
206 f2887b9d 2009-08-11 rsc 	lastpage = page;
207 f2887b9d 2009-08-11 rsc 	if(ra >= 0){
208 f2887b9d 2009-08-11 rsc 		c = emalloc(sizeof(*c));
209 f2887b9d 2009-08-11 rsc 		c->doc = doc;
210 f2887b9d 2009-08-11 rsc 		c->angle = angle;
211 f2887b9d 2009-08-11 rsc 		c->page = ra;
212 f2887b9d 2009-08-11 rsc 		c->im = nil;
213 f2887b9d 2009-08-11 rsc 		rabusy = 1;
214 f2887b9d 2009-08-11 rsc 		if(proccreate(raproc, c, mainstacksize) == -1)
215 f2887b9d 2009-08-11 rsc 			rabusy = 0;
216 f2887b9d 2009-08-11 rsc 	}
217 f2887b9d 2009-08-11 rsc 	return im;
218 f2887b9d 2009-08-11 rsc }