fontsrv: x11 support

R=rsc, 0intro
CC=plan9port.codebot
http://codereview.appspot.com/6739047

4 files changed, 274 insertions, 3 deletions

diff --git a/src/cmd/fontsrv/a.h b/src/cmd/fontsrv/a.h
index 0781fbab..9f132e92 100644
--- a/src/cmd/fontsrv/a.h
+++ b/src/cmd/fontsrv/a.h
@@ -11,6 +11,10 @@ struct XFont
 	int unit;
 	double height;
 	double originy;
+
+	// fontconfig workarround, as FC_FULLNAME does not work for matching fonts.
+	char *fontfile;
+	int  index;
 };
 
 void	loadfonts(void);
diff --git a/src/cmd/fontsrv/freetyperules.sh b/src/cmd/fontsrv/freetyperules.sh
new file mode 100644
index 00000000..ca7a0261
--- /dev/null
+++ b/src/cmd/fontsrv/freetyperules.sh
@@ -0,0 +1,7 @@
+#!/bin/sh
+
+if [ "x$1" = "xx11" ]; then
+	echo 'CFLAGS=$CFLAGS -I/usr/include/freetype2' 
+        echo 'LDFLAGS=$LDFLAGS -lfontconfig -lfreetype -lz'
+fi
+
diff --git a/src/cmd/fontsrv/mkfile b/src/cmd/fontsrv/mkfile
index 3d23062e..fb3d86b2 100644
--- a/src/cmd/fontsrv/mkfile
+++ b/src/cmd/fontsrv/mkfile
@@ -1,5 +1,6 @@
-<|sh ../devdraw/mkwsysrules.sh
 <$PLAN9/src/mkhdr
+<|sh ../devdraw/mkwsysrules.sh
+<|sh freetyperules.sh $WSYSTYPE
 
 TARG=fontsrv
 
diff --git a/src/cmd/fontsrv/x11.c b/src/cmd/fontsrv/x11.c
index f1fb3cd9..01f2b965 100644
--- a/src/cmd/fontsrv/x11.c
+++ b/src/cmd/fontsrv/x11.c
@@ -1,2 +1,261 @@
-/* maybe someday */
-#include "nowsys.c"
+#include <u.h>
+
+#include <fontconfig/fontconfig.h>
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+#include <libc.h>
+#include <draw.h>
+#include <memdraw.h>
+#include "a.h"
+
+static FcConfig    *fc;
+static FT_Library  lib;
+static int         dpi = 96;
+
+void
+loadfonts(void)
+{
+	int i;
+	FT_Error e;
+	FcFontSet *sysfonts;
+
+	if(!FcInit() || (fc=FcInitLoadConfigAndFonts()) == NULL) {
+		fprint(2, "fontconfig initialization failed\n");
+		exits("fontconfig failed");
+	}
+
+	e = FT_Init_FreeType(&lib);
+	if(e) {
+		fprint(2, "freetype initialization failed: %d\n", e);
+		exits("freetype failed");
+	}
+
+	sysfonts = FcConfigGetFonts(fc, FcSetSystem);
+
+	xfont = emalloc9p(sysfonts->nfont*sizeof xfont[0]);
+	memset(xfont, 0, sysfonts->nfont*sizeof xfont[0]);
+	for(i=0; i<sysfonts->nfont; i++) {
+		FcChar8 *fullname, *fontfile;
+		int index;
+		FcPattern *pat = sysfonts->fonts[i];
+
+		if(FcPatternGetString(pat, FC_FULLNAME, 0, &fullname) != FcResultMatch ||
+		   FcPatternGetString(pat, FC_FILE, 0, &fontfile) != FcResultMatch     ||
+		   FcPatternGetInteger(pat, FC_INDEX, 0, &index) != FcResultMatch)
+			continue;
+
+		xfont[nxfont].name     = strdup((char*)fullname);
+		xfont[nxfont].fontfile = strdup((char*)fontfile);
+		xfont[nxfont].index    = index;
+		nxfont++;
+	}
+
+	FcFontSetDestroy(sysfonts);
+}
+
+void
+load(XFont *f)
+{
+	FT_Face face;
+	FT_Error e;
+	FT_ULong charcode;
+	FT_UInt glyph_index;
+
+	if(f->loaded)
+		return;
+
+	e = FT_New_Face(lib, f->fontfile, f->index, &face);
+
+	if(e){
+		fprint(2, "load failed for %s (%s) index:%d\n", f->name, f->fontfile, f->index);
+		return;
+	}
+
+	if(!FT_IS_SCALABLE(face)) {
+		fprint(2, "%s is a non scalable font, skipping\n", f->name);
+		FT_Done_Face(face);
+	    f->loaded = 1;
+		return;
+	}
+
+	f->unit = face->units_per_EM;
+	f->height = (int)((face->ascender - face->descender) * 1.2);
+	f->originy = face->descender; // bbox.yMin (or descender)  is negative, becase the baseline is y-coord 0
+
+	for(charcode=FT_Get_First_Char(face, &glyph_index); glyph_index != 0;
+		charcode=FT_Get_Next_Char(face, charcode, &glyph_index)) {
+
+		int idx = charcode>>8;
+
+		if(charcode > 0xffff)
+			break;
+
+		if(!f->range[idx]) {
+			f->range[idx] = 1;
+			f->nrange++;
+		}
+	}
+
+	FT_Done_Face(face);
+	f->loaded = 1;
+}
+
+Memsubfont*
+mksubfont(char *name, int lo, int hi, int size, int antialias)
+{
+	XFont *xf, *xfp, *xfe;
+	FT_Face face;
+	FT_Error e;
+	Memimage *m, *mc, *m1;
+	double pixel_size;
+	int x, y, y0;
+	int i;
+	Fontchar *fc, *fc0;
+	Memsubfont *sf;
+	Point rect_points[4];
+
+	xf = nil;
+	for(xfp=xfont, xfe=xfont+nxfont; xfp != xfe; xfp++) {
+		if(strcmp(xfp->name, name) == 0) {
+			xf = xfp;
+			break;
+		}
+	}
+
+	if(!xf)
+		return nil;
+
+	e = FT_New_Face(lib, xf->fontfile, xf->index, &face);
+
+	if(e){
+		fprint(2, "load failed for %s (%s) index:%d\n", xf->name, xf->fontfile, xf->index);
+		return nil;
+	}
+
+	e = FT_Set_Char_Size(face, 0, size<<6, dpi, dpi);
+	if(e){
+		fprint(2, "FT_Set_Char_Size failed\n");
+		FT_Done_Face(face);
+		return nil;
+	}
+
+	pixel_size = (dpi*size)/72.0;
+	x = (int)((face->max_advance_width) * pixel_size/xf->unit + 0.99999999);
+	y = (int)((face->ascender - face->descender) * pixel_size/xf->unit + 0.99999999);
+	y0 = (int)(-face->descender * pixel_size/xf->unit + 0.99999999);
+
+	m = allocmemimage(Rect(0, 0, x*(hi+1-lo), y), antialias ? GREY8 : GREY1);
+	if(m == nil) {
+		FT_Done_Face(face);
+		return nil;
+	}
+	mc = allocmemimage(Rect(0, 0, x, y), antialias ? GREY8 : GREY1);
+	if(mc == nil) {
+		freememimage(m);
+		FT_Done_Face(face);
+		return nil;
+	}
+	memfillcolor(m, DBlack);
+	memfillcolor(mc, DBlack);
+	fc = malloc((hi+2 - lo) * sizeof fc[0]);
+	sf = malloc(sizeof *sf);
+	if(fc == nil || sf == nil) {
+		freememimage(m);
+		freememimage(mc);
+		free(fc);
+		free(sf);
+		FT_Done_Face(face);
+		return nil;
+	}
+	fc0 = fc;
+
+	//rect_points[0] = mc->r.min;
+	//rect_points[1] = Pt(mc->r.max.x, mc->r.min.y);
+	//rect_points[2] = mc->r.max;
+	//rect_points[3] = Pt(mc->r.min.x, mc->r.max.y);
+
+	x = 0;
+	for(i=lo; i<=hi; i++, fc++) {
+		int r;
+		int advance;
+
+		memfillcolor(mc, DBlack);
+
+		e = FT_Load_Char(face, i, FT_LOAD_RENDER|(antialias ? 0:FT_LOAD_TARGET_MONO));
+		if(e){
+			fprint(2, "FT_Load_Char failed for %d\n", i);
+			//mempoly(mc, rect_points, 4, Endsquare, Endsquare, 0, memopaque, ZP, S);
+			memimageline(mc, m->r.min, Pt(m->r.max.x, m->r.min.y), Endsquare, Endsquare, 0, memopaque, ZP, S);
+			memimageline(mc, m->r.min, Pt(m->r.min.x, m->r.max.y), Endsquare, Endsquare, 0, memopaque, ZP, S);
+			memimageline(mc, Pt(m->r.max.x, m->r.min.y), m->r.max, Endsquare, Endsquare, 0, memopaque, ZP, S);
+			memimageline(mc, Pt(m->r.min.x, m->r.max.y), m->r.max, Endsquare, Endsquare, 0, memopaque, ZP, S);
+			memimageline(mc, m->r.min, m->r.max, Endsquare, Endsquare, 0, memopaque, ZP, S);
+			advance = Dx(m->r);
+
+			memimagedraw(m, Rect(x, 0, x + advance, y), mc, ZP, memopaque, ZP, S);
+		} else {
+			FT_Bitmap *bitmap = &face->glyph->bitmap;
+			uchar *base = byteaddr(mc, mc->r.min);
+			advance = (face->glyph->advance.x+32) >> 6;
+
+			for(r=0; r < bitmap->rows; r++)
+				memmove(base + r*mc->width*sizeof(u32int), bitmap->buffer + r*bitmap->pitch, bitmap->pitch);
+
+			memimagedraw(m, Rect(x, 0, x + advance, y), mc,
+				Pt(-face->glyph->bitmap_left, -(y - y0 - face->glyph->bitmap_top)),
+				memopaque, ZP, S);
+		}
+
+		fc->x = x;
+		fc->top = 0;
+		fc->bottom = y;
+		fc->left = 0;
+		fc->width = advance;
+		x += advance;
+
+#ifdef DEBUG_FT_BITMAP
+		for(r=0; r < bitmap->rows; r++) {
+			int c;
+			uchar *span = bitmap->buffer+(r*bitmap->pitch);
+			for(c = 0; c < bitmap->width; c++) {
+				fprint(1, "%02x", span[c]);
+			}
+			fprint(1,"\n");
+		}
+#endif
+
+#ifdef DEBUG_9_BITMAP
+		for(r=0; r < mc->r.max.y; r++) {
+			int c;
+			uchar *span = base+(r*mc->width*sizeof(u32int));
+			for(c = 0; c < Dx(mc->r); c++) {
+				fprint(1, "%02x", span[c]);
+			}
+			fprint(1,"\n");
+		}
+#endif
+	}
+	fc->x = x;
+
+	// round up to 32-bit boundary
+	// so that in-memory data is same
+	// layout as in-file data.
+	if(antialias)
+		x += -x & 3;
+	else
+		x += -x & 31;
+	m1 = allocmemimage(Rect(0, 0, x, y), antialias ? GREY8 : GREY1);
+	memimagedraw(m1, m1->r, m, m->r.min, memopaque, ZP, S);
+	freememimage(m);
+
+	sf->name = nil;
+	sf->n = hi+1 - lo;
+	sf->height = Dy(m1->r);
+	sf->ascent = Dy(m1->r) - y0;
+	sf->info = fc0;
+	sf->bits = m1;
+
+	FT_Done_Face(face);
+	return sf;
+}