1 #include <u.h>
2 
3 #include <fontconfig/fontconfig.h>
4 #include <ft2build.h>
5 #include FT_FREETYPE_H
6 
7 #include <libc.h>
8 #include <draw.h>
9 #include <memdraw.h>
10 #include "a.h"
11 
12 static FcConfig    *fc;
13 static FT_Library  lib;
14 static int         dpi = 96;
15 
16 void
17 loadfonts(void)
18 {
19 	int i;
20 	FT_Error e;
21 	FcFontSet *sysfonts;
22 
23 	if(!FcInit() || (fc=FcInitLoadConfigAndFonts()) == NULL) {
24 		fprint(2, "fontconfig initialization failed\n");
25 		exits("fontconfig failed");
26 	}
27 
28 	e = FT_Init_FreeType(&lib);
29 	if(e) {
30 		fprint(2, "freetype initialization failed: %d\n", e);
31 		exits("freetype failed");
32 	}
33 
34 	sysfonts = FcConfigGetFonts(fc, FcSetSystem);
35 
36 	xfont = emalloc9p(sysfonts->nfont*sizeof xfont[0]);
37 	memset(xfont, 0, sysfonts->nfont*sizeof xfont[0]);
38 	for(i=0; i<sysfonts->nfont; i++) {
39 		FcChar8 *fullname, *fontfile;
40 		int index;
41 		FcPattern *pat = sysfonts->fonts[i];
42 
43 		if(FcPatternGetString(pat, FC_POSTSCRIPT_NAME, 0, &fullname) != FcResultMatch ||
44 		   FcPatternGetString(pat, FC_FILE, 0, &fontfile) != FcResultMatch     ||
45 		   FcPatternGetInteger(pat, FC_INDEX, 0, &index) != FcResultMatch)
46 			continue;
47 
48 		xfont[nxfont].name     = strdup((char*)fullname);
49 		xfont[nxfont].fontfile = strdup((char*)fontfile);
50 		xfont[nxfont].index    = index;
51 		nxfont++;
52 	}
53 
54 	FcFontSetDestroy(sysfonts);
55 }
56 
57 void
58 load(XFont *f)
59 {
60 	FT_Face face;
61 	FT_Error e;
62 	FT_ULong charcode;
63 	FT_UInt glyph_index;
64 
65 	if(f->loaded)
66 		return;
67 
68 	e = FT_New_Face(lib, f->fontfile, f->index, &face);
69 	if(e){
70 		fprint(2, "load failed for %s (%s) index:%d\n", f->name, f->fontfile, f->index);
71 		return;
72 	}
73 	if(!FT_IS_SCALABLE(face)) {
74 		fprint(2, "%s is a non scalable font, skipping\n", f->name);
75 		FT_Done_Face(face);
76 		f->loaded = 1;
77 		return;
78 	}
79 	f->unit = face->units_per_EM;
80 	f->height = (int)((face->ascender - face->descender) * 1.35);
81 	f->originy = face->descender; // bbox.yMin (or descender)  is negative, becase the baseline is y-coord 0
82 
83 	for(charcode=FT_Get_First_Char(face, &glyph_index); glyph_index != 0;
84 		charcode=FT_Get_Next_Char(face, charcode, &glyph_index)) {
85 
86 		int idx = charcode/SubfontSize;
87 
88 		if(charcode > 0xffff)
89 			break;
90 
91 		if(!f->range[idx]) {
92 			f->range[idx] = 1;
93 			f->nrange++;
94 		}
95 	}
96 	// libdraw expects U+0000 to be present
97 	if(!f->range[0]) {
98 		f->range[0] = 1;
99 		f->nrange++;
100 	}
101 	FT_Done_Face(face);
102 	f->loaded = 1;
103 }
104 
105 Memsubfont*
106 mksubfont(XFont *xf, char *name, int lo, int hi, int size, int antialias)
107 {
108 	FT_Face face;
109 	FT_Error e;
110 	Memimage *m, *mc, *m1;
111 	double pixel_size;
112 	int w, x, y, y0;
113 	int i;
114 	Fontchar *fc, *fc0;
115 	Memsubfont *sf;
116 	//Point rect_points[4];
117 
118 	e = FT_New_Face(lib, xf->fontfile, xf->index, &face);
119 	if(e){
120 		fprint(2, "load failed for %s (%s) index:%d\n", xf->name, xf->fontfile, xf->index);
121 		return nil;
122 	}
123 
124 	e = FT_Set_Char_Size(face, 0, size<<6, dpi, dpi);
125 	if(e){
126 		fprint(2, "FT_Set_Char_Size failed\n");
127 		FT_Done_Face(face);
128 		return nil;
129 	}
130 
131 	pixel_size = (dpi*size)/72.0;
132 	w = x = (int)((face->max_advance_width) * pixel_size/xf->unit + 0.99999999);
133 	y = (int)((face->ascender - face->descender) * pixel_size/xf->unit + 0.99999999);
134 	y0 = (int)(-face->descender * pixel_size/xf->unit + 0.99999999);
135 
136 	m = allocmemimage(Rect(0, 0, x*(hi+1-lo)+1, y+1), antialias ? GREY8 : GREY1);
137 	if(m == nil) {
138 		FT_Done_Face(face);
139 		return nil;
140 	}
141 	mc = allocmemimage(Rect(0, 0, x+1, y+1), antialias ? GREY8 : GREY1);
142 	if(mc == nil) {
143 		freememimage(m);
144 		FT_Done_Face(face);
145 		return nil;
146 	}
147 	memfillcolor(m, DBlack);
148 	memfillcolor(mc, DBlack);
149 	fc = malloc((hi+2 - lo) * sizeof fc[0]);
150 	sf = malloc(sizeof *sf);
151 	if(fc == nil || sf == nil) {
152 		freememimage(m);
153 		freememimage(mc);
154 		free(fc);
155 		free(sf);
156 		FT_Done_Face(face);
157 		return nil;
158 	}
159 	fc0 = fc;
160 
161 	//rect_points[0] = mc->r.min;
162 	//rect_points[1] = Pt(mc->r.max.x, mc->r.min.y);
163 	//rect_points[2] = mc->r.max;
164 	//rect_points[3] = Pt(mc->r.min.x, mc->r.max.y);
165 
166 	x = 0;
167 	for(i=lo; i<=hi; i++, fc++) {
168 		int k, r;
169 		int advance;
170 
171 		memfillcolor(mc, DBlack);
172 
173 		fc->x = x;
174 		fc->top = 0;
175 		fc->bottom = Dy(m->r);
176 		e = 1;
177 		k = FT_Get_Char_Index(face, i);
178 		if(k != 0) {
179 			e = FT_Load_Glyph(face, k, FT_LOAD_RENDER|FT_LOAD_NO_HINTING|(antialias ? 0:FT_LOAD_TARGET_MONO));
180 		}
181 		if(e || face->glyph->advance.x <= 0) {
182 			fc->width = 0;
183 			fc->left = 0;
184 			if(i == 0) {
185 				drawpjw(m, fc, x, w, y, y - y0);
186 				x += fc->width;
187 			}
188 			continue;
189 		}
190 
191 		FT_Bitmap *bitmap = &face->glyph->bitmap;
192 		uchar *base = byteaddr(mc, mc->r.min);
193 		advance = (face->glyph->advance.x+32) >> 6;
194 
195 		for(r=0; r < bitmap->rows; r++)
196 			memmove(base + r*mc->width*sizeof(u32int), bitmap->buffer + r*bitmap->pitch, bitmap->pitch);
197 
198 		memimagedraw(m, Rect(x, 0, x + advance, y), mc,
199 			Pt(-face->glyph->bitmap_left, -(y - y0 - face->glyph->bitmap_top)),
200 			memopaque, ZP, S);
201 
202 		fc->width = advance;
203 		fc->left = 0;
204 		x += advance;
205 
206 #ifdef DEBUG_FT_BITMAP
207 		for(r=0; r < bitmap->rows; r++) {
208 			int c;
209 			uchar *span = bitmap->buffer+(r*bitmap->pitch);
210 			for(c = 0; c < bitmap->width; c++) {
211 				fprint(1, "%02x", span[c]);
212 			}
213 			fprint(1,"\n");
214 		}
215 #endif
216 
217 #ifdef DEBUG_9_BITMAP
218 		for(r=0; r < mc->r.max.y; r++) {
219 			int c;
220 			uchar *span = base+(r*mc->width*sizeof(u32int));
221 			for(c = 0; c < Dx(mc->r); c++) {
222 				fprint(1, "%02x", span[c]);
223 			}
224 			fprint(1,"\n");
225 		}
226 #endif
227 	}
228 	fc->x = x;
229 
230 	// round up to 32-bit boundary
231 	// so that in-memory data is same
232 	// layout as in-file data.
233 	if(x == 0)
234 		x = 1;
235 	if(y == 0)
236 		y = 1;
237 	if(antialias)
238 		x += -x & 3;
239 	else
240 		x += -x & 31;
241 	m1 = allocmemimage(Rect(0, 0, x, y), antialias ? GREY8 : GREY1);
242 	memimagedraw(m1, m1->r, m, m->r.min, memopaque, ZP, S);
243 	freememimage(m);
244 	freememimage(mc);
245 
246 	sf->name = nil;
247 	sf->n = hi+1 - lo;
248 	sf->height = Dy(m1->r);
249 	sf->ascent = Dy(m1->r) - y0;
250 	sf->info = fc0;
251 	sf->bits = m1;
252 
253 	FT_Done_Face(face);
254 	return sf;
255 }