tpjw.c - plan9port - [fork] Plan 9 from user space
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---
tpjw.c (8815B)
---
1 #include <u.h>
2 #include <libc.h>
3 #include <draw.h>
4 #include <memdraw.h>
5 #include "a.h"
6
7 uchar pjw[] = {
8 0x63, 0x6f, 0x6d, 0x70, 0x72, 0x65, 0x73, 0x73,
9 0x65, 0x64, 0x0a, 0x20, 0x20, 0x20, 0x20, 0x20,
10 0x20, 0x20, 0x20, 0x20, 0x6b, 0x32, 0x20, 0x20,
11 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
12 0x20, 0x30, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
13 0x20, 0x20, 0x20, 0x20, 0x20, 0x30, 0x20, 0x20,
14 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
15 0x34, 0x38, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
16 0x20, 0x20, 0x20, 0x20, 0x34, 0x38, 0x20, 0x20,
17 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
18 0x34, 0x38, 0x20, 0x20, 0x20, 0x20, 0x20, 0x20,
19 0x20, 0x20, 0x20, 0x35, 0x34, 0x31, 0x20, 0x80,
20 0xff, 0x20, 0x00, 0x08, 0x00, 0x82, 0xc0, 0x16,
21 0x7f, 0x04, 0x06, 0x04, 0x00, 0x83, 0xfc, 0x01,
22 0x04, 0x06, 0x04, 0x07, 0x04, 0x00, 0x83, 0xf1,
23 0x00, 0x50, 0x11, 0x04, 0x18, 0x04, 0x00, 0x84,
24 0xd4, 0x40, 0x48, 0x04, 0x05, 0x00, 0x07, 0x04,
25 0x00, 0x87, 0xc1, 0x44, 0x11, 0x04, 0x51, 0xbf,
26 0xff, 0xff, 0x04, 0x00, 0x87, 0x16, 0xfe, 0x81,
27 0x01, 0x40, 0x5f, 0xff, 0xff, 0x04, 0x00, 0x87,
28 0x5f, 0xff, 0xe4, 0x00, 0x40, 0x01, 0x1f, 0xff,
29 0x00, 0x00, 0x88, 0xfd, 0x7f, 0xff, 0xfd, 0x11,
30 0x11, 0x00, 0x3f, 0xff, 0x00, 0x00, 0x80, 0xe5,
31 0x00, 0x03, 0x84, 0x50, 0x04, 0x10, 0x42, 0xff,
32 0x00, 0x00, 0x80, 0x97, 0x00, 0x03, 0x84, 0x51,
33 0x00, 0x00, 0x07, 0xff, 0x00, 0x00, 0x80, 0x67,
34 0x00, 0x03, 0x84, 0xc4, 0x40, 0x41, 0x11, 0x3f,
35 0x00, 0x75, 0x80, 0x4f, 0x00, 0x0b, 0x84, 0xd0,
36 0x40, 0x00, 0x11, 0x1b, 0x82, 0xff, 0xff, 0xf5,
37 0x04, 0x40, 0x84, 0xf0, 0x00, 0x00, 0x04, 0x5f,
38 0x82, 0xff, 0xff, 0xe1, 0x04, 0x40, 0x84, 0xf4,
39 0x00, 0x00, 0x01, 0x5b, 0x00, 0x1e, 0x80, 0x2f,
40 0x04, 0x9e, 0x83, 0x00, 0x00, 0x00, 0x17, 0x82,
41 0xff, 0xff, 0x40, 0x04, 0x96, 0x84, 0xfe, 0x40,
42 0x00, 0x00, 0x0f, 0x82, 0xff, 0xfd, 0x00, 0x08,
43 0xa2, 0x00, 0x0b, 0x80, 0x5f, 0x8b, 0xff, 0xf9,
44 0x00, 0xb5, 0x11, 0x5f, 0xff, 0xa5, 0x64, 0x00,
45 0x00, 0x1f, 0x85, 0xff, 0xf4, 0x01, 0x0a, 0xf5,
46 0x42, 0x04, 0x2e, 0x81, 0x00, 0x2b, 0x87, 0xff,
47 0xf0, 0x01, 0x0f, 0xe4, 0x54, 0xf0, 0x3f, 0x00,
48 0x23, 0x80, 0x1f, 0x88, 0xff, 0xe0, 0x00, 0x4e,
49 0x00, 0x04, 0x00, 0x00, 0x14, 0x00, 0x0b, 0x85,
50 0xff, 0xd0, 0x00, 0x4c, 0x50, 0x44, 0x04, 0x22,
51 0x81, 0x00, 0x0b, 0x00, 0x0b, 0x82, 0x49, 0xa6,
52 0x6c, 0x00, 0x76, 0x00, 0x17, 0x00, 0x7d, 0x88,
53 0x5e, 0xd6, 0xf9, 0xf1, 0x51, 0x11, 0x00, 0x00,
54 0x3f, 0x88, 0xff, 0xf1, 0x02, 0x2e, 0xff, 0xf3,
55 0xf4, 0x6a, 0x98, 0x00, 0x0b, 0x8b, 0xff, 0xf3,
56 0x06, 0x2f, 0xff, 0xeb, 0xf8, 0xba, 0xa5, 0x04,
57 0x00, 0xbf, 0x8b, 0xff, 0xf5, 0x42, 0x9f, 0xff,
58 0xcf, 0xf9, 0x2b, 0xa5, 0xc0, 0x08, 0xff, 0x8b,
59 0xff, 0xfc, 0xc5, 0xfd, 0x40, 0x3f, 0xfe, 0x0b,
60 0xfb, 0x00, 0x0e, 0xff, 0x00, 0xae, 0x88, 0xfa,
61 0x96, 0xff, 0xfa, 0x81, 0x54, 0x40, 0x1b, 0xff,
62 0x00, 0x0b, 0x88, 0xfe, 0xaa, 0x96, 0x50, 0x59,
63 0x41, 0x00, 0x7b, 0xff, 0x88, 0xff, 0xff, 0x53,
64 0xff, 0xab, 0xc0, 0x00, 0x16, 0x54, 0x00, 0xba,
65 0x8b, 0xff, 0xff, 0x43, 0xfe, 0xaf, 0xe8, 0x00,
66 0x5a, 0x61, 0x41, 0xbf, 0xff, 0x8b, 0xff, 0xff,
67 0xc2, 0xfe, 0xbf, 0xfd, 0x01, 0x59, 0x94, 0x51,
68 0x1b, 0xff, 0x00, 0xef, 0x88, 0xfe, 0xeb, 0xed,
69 0x95, 0x56, 0x51, 0x40, 0x0f, 0xff, 0x8b, 0xff,
70 0xff, 0xe0, 0xfa, 0x92, 0xa6, 0x91, 0x11, 0x54,
71 0x54, 0x0f, 0xff, 0x00, 0x0b, 0x84, 0xff, 0xa9,
72 0xa4, 0x00, 0x01, 0x04, 0x17, 0x00, 0x6c, 0x88,
73 0xba, 0xaf, 0xff, 0xfd, 0x96, 0x45, 0x40, 0x3f,
74 0xff, 0x00, 0x00, 0x88, 0x2a, 0xbf, 0x6a, 0xa4,
75 0x15, 0x54, 0x60, 0xbf, 0xff, 0x00, 0x00, 0x88,
76 0xfa, 0xeb, 0x90, 0x00, 0x95, 0x41, 0xae, 0xff,
77 0xff, 0x04, 0x0b, 0x84, 0xaa, 0xa5, 0x11, 0x45,
78 0x05, 0x01, 0x49, 0x05, 0x27, 0x87, 0xae, 0xff,
79 0xf9, 0x54, 0x11, 0x6e, 0xff, 0xff, 0x0c, 0x0b,
80 0x85, 0xfa, 0x54, 0x56, 0xbb, 0xff, 0xff, 0x04,
81 0x0b, 0x87, 0xab, 0xbf, 0xf6, 0x54, 0x43, 0xaf,
82 0xff, 0xff, 0x04, 0x00, 0x87, 0x5a, 0xaa, 0x95,
83 0x11, 0x46, 0xfb, 0xff, 0xff, 0x04, 0x00, 0x84,
84 0xaa, 0x55, 0x10, 0x45, 0x07, 0x00, 0x17, 0x04,
85 0x00, 0x84, 0x95, 0x54, 0x45, 0x14, 0x06, 0x00,
86 0x5e, 0x04, 0x00, 0x87, 0xa5, 0x55, 0x50, 0x40,
87 0x12, 0xff, 0xbf, 0xff,
88 };
89
90 static Memimage* resample(int, int, Memimage*);
91
92 void
93 drawpjw(Memimage *m, Fontchar *fc, int x, int width, int height, int ascent)
94 {
95 int w, p[2];
96 Memimage *pm, *pm1, *pm2;
97 Rectangle r;
98 int margin;
99
100 w = width;
101
102 // assume margin below baseline is
103 // approximately how much room we should preserve at top above peter too
104 margin = height - ascent;
105 if(w > ascent-margin)
106 w = ascent-margin;
107
108 if(w < 9)
109 w = 9;
110 fc->width = w;
111
112 pipe(p);
113 write(p[1], pjw, sizeof pjw);
114 close(p[1]);
115 pm = readmemimage(p[0]);
116 close(p[0]);
117 if(pm == nil)
118 goto Error;
119
120 pm1 = allocmemimage(pm->r, GREY8);
121 memimagedraw(pm1, pm1->r, pm, pm->r.min, nil, ZP, S);
122 pm2 = resample(w, w, pm1);
123 memimagedraw(m, Rect(x, ascent-w, x+w, ascent), memwhite, ZP, nil, ZP, SoverD);
124 memimagedraw(m, Rect(x, ascent-w, x+w, ascent), memblack, ZP, pm2, pm2->r.min, SoverD);
125 freememimage(pm2);
126 freememimage(pm1);
127 freememimage(pm);
128 return;
129
130 Error:
131 // draw a box
132 r = Rect(x, 0, x+width, height);
133 memimagedraw(m, r, memwhite, ZP, nil, ZP, S);
134 memimagedraw(m, insetrect(r, 3), memblack, ZP, nil, ZP, S);
135 return;
136 }
137
138 #define K2 7 /* from -.7 to +.7 inclusive, meaning .2 into each adjacent pixel */
139 #define NK (2*K2+1)
140 static double K[NK];
141
142 static void
143 resamplex(uchar *in, int off, int d, int inx, uchar *out, int outx)
144 {
145 int i, x, k;
146 double X, xx, v, rat;
147
148
149 rat = (double)inx/(double)outx;
150 for(x=0; x<outx; x++){
151 if(inx == outx){
152 /* don't resample if size unchanged */
153 out[off+x*d] = in[off+x*d];
154 continue;
155 }
156 v = 0.0;
157 X = x*rat;
158 for(k=-K2; k<=K2; k++){
159 xx = X + rat*k/10.;
160 i = xx;
161 if(i < 0)
162 i = 0;
163 if(i >= inx)
164 i = inx-1;
165 v += in[off+i*d] * K[K2+k];
166 }
167 out[off+x*d] = v;
168 }
169 }
170
171 static void
172 resampley(uchar **in, int off, int iny, uchar **out, int outy)
173 {
174 int y, i, k;
175 double Y, yy, v, rat;
176
177 rat = (double)iny/(double)outy;
178 for(y=0; y<outy; y++){
179 if(iny == outy){
180 /* don't resample if size unchanged */
181 out[y][off] = in[y][off];
182 continue;
183 }
184 v = 0.0;
185 Y = y*rat;
186 for(k=-K2; k<=K2; k++){
187 yy = Y + rat*k/10.;
188 i = yy;
189 if(i < 0)
190 i = 0;
191 if(i >= iny)
192 i = iny-1;
193 v += in[i][off] * K[K2+k];
194 }
195 out[y][off] = v;
196 }
197
198 }
199
200 static int
201 max(int a, int b)
202 {
203 if(a > b)
204 return a;
205 return b;
206 }
207
208 static double
209 fac(int L)
210 {
211 int i, f;
212
213 f = 1;
214 for(i=L; i>1; --i)
215 f *= i;
216 return f;
217 }
218
219 /*
220 * i0(x) is the modified Bessel function, Σ (x/2)^2L / (L!)²
221 * There are faster ways to calculate this, but we precompute
222 * into a table so let's keep it simple.
223 */
224 static double
225 i0(double x)
226 {
227 double v;
228 int L;
229
230 v = 1.0;
231 for(L=1; L<10; L++)
232 v += pow(x/2., 2*L)/pow(fac(L), 2);
233 return v;
234 }
235
236 static double
237 kaiser(double x, double tau, double alpha)
238 {
239 if(fabs(x) > tau)
240 return 0.;
241 return i0(alpha*sqrt(1-(x*x/(tau*tau))))/i0(alpha);
242 }
243
244
245 static Memimage*
246 resample(int xsize, int ysize, Memimage *m)
247 {
248 int i, j, bpl, nchan;
249 Memimage *new;
250 uchar **oscan, **nscan;
251 double v;
252
253 for(i=-K2; i<=K2; i++){
254 K[K2+i] = kaiser(i/10., K2/10., 4.);
255 /* print("%g %g\n", i/10., K[K2+i]); */
256 }
257
258 /* normalize */
259 v = 0.0;
260 for(i=0; i<NK; i++)
261 v += K[i];
262 for(i=0; i<NK; i++)
263 K[i] /= v;
264
265 new = allocmemimage(Rect(0, 0, xsize, ysize), m->chan);
266 if(new == nil)
267 sysfatal("can't allocate new image: %r");
268
269 oscan = malloc(Dy(m->r)*sizeof(uchar*));
270 nscan = malloc(max(ysize, Dy(m->r))*sizeof(uchar*));
271 if(oscan == nil || nscan == nil)
272 sysfatal("can't allocate: %r");
273
274 /* unload original image into scan lines */
275 bpl = bytesperline(m->r, m->depth);
276 for(i=0; i<Dy(m->r); i++){
277 oscan[i] = malloc(bpl);
278 if(oscan[i] == nil)
279 sysfatal("can't allocate: %r");
280 j = unloadmemimage(m, Rect(m->r.min.x, m->r.min.y+i, m->r.max.x, m->r.min.y+i+1), oscan[i], bpl);
281 if(j != bpl)
282 sysfatal("unloadmemimage");
283 }
284
285 /* allocate scan lines for destination. we do y first, so need at least Dy(m->r) lines */
286 bpl = bytesperline(Rect(0, 0, xsize, Dy(m->r)), m->depth);
287 for(i=0; i<max(ysize, Dy(m->r)); i++){
288 nscan[i] = malloc(bpl);
289 if(nscan[i] == nil)
290 sysfatal("can't allocate: %r");
291 }
292
293 /* resample in X */
294 nchan = m->depth/8;
295 for(i=0; i<Dy(m->r); i++){
296 for(j=0; j<nchan; j++){
297 if(j==0 && m->chan==XRGB32)
298 continue;
299 resamplex(oscan[i], j, nchan, Dx(m->r), nscan[i], xsize);
300 }
301 free(oscan[i]);
302 oscan[i] = nscan[i];
303 nscan[i] = malloc(bpl);
304 if(nscan[i] == nil)
305 sysfatal("can't allocate: %r");
306 }
307
308 /* resample in Y */
309 for(i=0; i<xsize; i++)
310 for(j=0; j<nchan; j++)
311 resampley(oscan, nchan*i+j, Dy(m->r), nscan, ysize);
312
313 /* pack data into destination */
314 bpl = bytesperline(new->r, m->depth);
315 for(i=0; i<ysize; i++){
316 j = loadmemimage(new, Rect(0, i, xsize, i+1), nscan[i], bpl);
317 if(j != bpl)
318 sysfatal("loadmemimage: %r");
319 }
320 return new;
321 }