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netsurf/amiga/font.c
Chris Young f55c11dbd6 Amiga font code revamped and fixed. Will now fall back to a different font if the 
character isn't present in the current one, this needs a complete or near-complete
Unicode font in order to be useful - Code2000 and Bitstream Cyberbit are auto-detected
by NetSurf on startup if none is configured.  Japanese websites now display correctly,
along with Japanese characters within Google UK search results etc.

svn path=/trunk/netsurf/; revision=10551
2010-05-06 10:02:58 +00:00

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/*
* Copyright 2008 - 2010 Chris Young <chris@unsatisfactorysoftware.co.uk>
*
* This file is part of NetSurf, http://www.netsurf-browser.org/
*
* NetSurf is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* NetSurf is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <assert.h>
#include "css/css.h"
#include "render/font.h"
#include "amiga/gui.h"
#include <proto/graphics.h>
#include <proto/diskfont.h>
#include <graphics/rpattr.h>
#include "amiga/font.h"
#include "desktop/options.h"
#include "amiga/utf8.h"
#include "utils/utf8.h"
#include <diskfont/diskfonttag.h>
#include <diskfont/oterrors.h>
#include <proto/Picasso96API.h>
#include <proto/exec.h>
#include <graphics/blitattr.h>
#include "amiga/options.h"
#include <proto/utility.h>
#include "utils/utils.h"
#define NSA_UNICODE_FONT PLOT_FONT_FAMILY_COUNT
static struct OutlineFont *of[PLOT_FONT_FAMILY_COUNT+1];
static struct OutlineFont *ofb[PLOT_FONT_FAMILY_COUNT+1];
static struct OutlineFont *ofi[PLOT_FONT_FAMILY_COUNT+1];
static struct OutlineFont *ofbi[PLOT_FONT_FAMILY_COUNT+1];
int32 ami_font_plot_glyph(struct OutlineFont *ofont, struct RastPort *rp,
uint16 char1, uint16 char2, uint32 x, uint32 y, uint32 emwidth);
struct OutlineFont *ami_open_outline_font(const plot_font_style_t *fstyle, BOOL fallback);
static bool nsfont_width(const plot_font_style_t *fstyle,
const char *string, size_t length,
int *width);
static bool nsfont_position_in_string(const plot_font_style_t *fstyle,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x);
static bool nsfont_split(const plot_font_style_t *fstyle,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x);
const struct font_functions nsfont = {
nsfont_width,
nsfont_position_in_string,
nsfont_split
};
bool nsfont_width(const plot_font_style_t *fstyle,
const char *string, size_t length,
int *width)
{
*width = ami_unicode_text(NULL,string,length,fstyle,0,0);
if(*width <= 0) *width == length; // fudge
return true;
}
/**
* Find the position in a string where an x coordinate falls.
*
* \param fstyle style for this text
* \param string UTF-8 string to measure
* \param length length of string
* \param x x coordinate to search for
* \param char_offset updated to offset in string of actual_x, [0..length]
* \param actual_x updated to x coordinate of character closest to x
* \return true on success, false on error and error reported
*/
bool nsfont_position_in_string(const plot_font_style_t *fstyle,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
struct TextExtent extent;
struct TextFont *tfont;
uint16 *utf16 = NULL, *outf16 = NULL;
uint16 utf16next = NULL;
FIXED kern = 0;
struct OutlineFont *ofont, *ufont = NULL;
struct GlyphMap *glyph;
uint32 tx=0,i=0;
size_t len, utf8len = 0;
uint8 *utf8;
uint32 co = 0;
int utf16charlen;
ULONG emwidth = (ULONG)((fstyle->size / FONT_SIZE_SCALE) * glob->scale);
int32 tempx;
len = utf8_bounded_length(string, length);
if(utf8_to_enc(string,"UTF-16",length,(char **)&utf16) != UTF8_CONVERT_OK) return false;
outf16 = utf16;
if(!(ofont = ami_open_outline_font(fstyle, FALSE))) return false;
*char_offset = length;
for(i=0;i<len;i++)
{
if (*utf16 < 0xD800 || 0xDFFF < *utf16)
utf16charlen = 1;
else
utf16charlen = 2;
utf8len = utf8_char_byte_length(string);
utf16next = utf16[utf16charlen];
tempx = ami_font_plot_glyph(ofont, NULL, *utf16, utf16next,
0, 0, emwidth);
if(tempx == 0)
{
if(ufont == NULL)
{
ufont = ami_open_outline_font(fstyle, TRUE);
}
if(ufont)
{
tempx = ami_font_plot_glyph(ufont, NULL, *utf16, utf16next,
0, 0, emwidth);
}
/*
if(tempx == 0)
{
tempx = ami_font_plot_glyph(ofont, NULL, 0xfffd, utf16next,
0, 0, emwidth);
}
*/
}
if(x < (tx + tempx))
{
*actual_x = tx;
i = len+1;
}
else
{
co += utf8len;
}
tx += tempx;
string += utf8len;
utf16 += utf16charlen;
}
if(co >= (length))
{
*actual_x = tx;
co = length;
}
*char_offset = co;
free(outf16);
return true;
}
/**
* Find where to split a string to make it fit a width.
*
* \param fstyle style for this text
* \param string UTF-8 string to measure
* \param length length of string
* \param x width available
* \param char_offset updated to offset in string of actual_x, [0..length]
* \param actual_x updated to x coordinate of character closest to x
* \return true on success, false on error and error reported
*
* On exit, [char_offset == 0 ||
* string[char_offset] == ' ' ||
* char_offset == length]
*/
bool nsfont_split(const plot_font_style_t *fstyle,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
struct TextExtent extent;
ULONG co;
char *ostr = string;
struct TextFont *tfont;
uint16 *utf16 = NULL,*outf16 = NULL;
uint16 utf16next = 0;
FIXED kern = 0;
int utf16charlen = 0;
struct OutlineFont *ofont, *ufont = NULL;
struct GlyphMap *glyph;
uint32 tx=0,i=0;
size_t len;
int utf8len, utf8clen = 0;
int32 tempx = 0;
ULONG emwidth = (ULONG)((fstyle->size / FONT_SIZE_SCALE) * glob->scale);
len = utf8_bounded_length(string, length);
if(utf8_to_enc((char *)string,"UTF-16",length,(char **)&utf16) != UTF8_CONVERT_OK) return false;
outf16 = utf16;
if(!(ofont = ami_open_outline_font(fstyle, FALSE))) return false;
*char_offset = 0;
*actual_x = 0;
for(i=0;i<len;i++)
{
utf8len = utf8_char_byte_length(string+utf8clen);
if (*utf16 < 0xD800 || 0xDFFF < *utf16)
utf16charlen = 1;
else
utf16charlen = 2;
utf16next = utf16[utf16charlen];
if(x < tx)
{
i = length+1;
}
else
{
if(string[utf8clen] == ' ') //*utf16 == 0x0020)
{
*actual_x = tx;
*char_offset = utf8clen;
}
}
tempx = ami_font_plot_glyph(ofont, NULL, *utf16, utf16next, 0, 0, emwidth);
if(tempx == 0)
{
if(ufont == NULL)
{
ufont = ami_open_outline_font(fstyle, TRUE);
}
if(ufont)
{
tempx = ami_font_plot_glyph(ufont, NULL, *utf16, utf16next,
0, 0, emwidth);
}
/*
if(tempx == 0)
{
tempx = ami_font_plot_glyph(ofont, NULL, 0xfffd, utf16next,
0, 0, emwidth);
}
*/
}
tx += tempx;
utf16 += utf16charlen;
utf8clen += utf8len;
}
free(outf16);
return true;
}
/**
* Open an outline font in the specified size and style
*
* \param fstyle font style structure
* \param default open a default font instead of the one specified by fstyle
* \return outline font or NULL on error
*/
struct OutlineFont *ami_open_outline_font(const plot_font_style_t *fstyle, BOOL fallback)
{
struct OutlineFont *ofont;
char *fontname;
ULONG ysize;
int tstyle = 0;
plot_font_generic_family_t fontfamily;
if(fallback) fontfamily = NSA_UNICODE_FONT;
else fontfamily = fstyle->family;
if ((fstyle->flags & FONTF_ITALIC) || (fstyle->flags & FONTF_OBLIQUE))
tstyle += NSA_ITALIC;
if (fstyle->weight >= 700)
tstyle += NSA_BOLD;
switch(tstyle)
{
case NSA_ITALIC:
if(ofi[fontfamily]) ofont = ofi[fontfamily];
else ofont = of[fontfamily];
break;
case NSA_BOLD:
if(ofb[fontfamily]) ofont = ofb[fontfamily];
else ofont = of[fontfamily];
break;
case NSA_BOLDITALIC:
if(ofbi[fontfamily]) ofont = ofbi[fontfamily];
else ofont = of[fontfamily];
break;
default:
ofont = of[fontfamily];
break;
}
/* Scale to 16.16 fixed point */
ysize = fstyle->size * ((1 << 16) / FONT_SIZE_SCALE) * glob->scale;
if(ESetInfo(&ofont->olf_EEngine,
OT_DeviceDPI,(72<<16) | 72,
OT_PointHeight,ysize,
TAG_END) == OTERR_Success)
{
return ofont;
}
return NULL;
}
int32 ami_font_plot_glyph(struct OutlineFont *ofont, struct RastPort *rp,
uint16 char1, uint16 char2, uint32 x, uint32 y, uint32 emwidth)
{
struct GlyphMap *glyph;
UBYTE *glyphbm;
int32 char_advance = 0;
FIXED kern = 0;
if(ESetInfo(&ofont->olf_EEngine,
OT_GlyphCode, char1,
OT_GlyphCode2, char2,
TAG_END) == OTERR_Success)
{
if(EObtainInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,&glyph,
TAG_END) == 0)
{
glyphbm = glyph->glm_BitMap;
if(!glyphbm) return 0;
if(rp)
{
BltBitMapTags(BLITA_SrcX, glyph->glm_BlackLeft,
BLITA_SrcY, glyph->glm_BlackTop,
BLITA_DestX, x - glyph->glm_X0 + glyph->glm_BlackLeft,
BLITA_DestY, y - glyph->glm_Y0 + glyph->glm_BlackTop,
BLITA_Width, glyph->glm_BlackWidth,
BLITA_Height, glyph->glm_BlackHeight,
BLITA_Source, glyphbm,
BLITA_SrcType, BLITT_ALPHATEMPLATE,
BLITA_Dest, rp,
BLITA_DestType, BLITT_RASTPORT,
BLITA_SrcBytesPerRow, glyph->glm_BMModulo,
TAG_DONE);
}
kern = 0;
if(char2) EObtainInfo(&ofont->olf_EEngine,
OT_TextKernPair, &kern,
TAG_END);
char_advance = (ULONG)(((glyph->glm_Width - kern) * emwidth) / 65536);
EReleaseInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,glyph,
TAG_END);
}
}
return char_advance;
}
ULONG ami_unicode_text(struct RastPort *rp,const char *string,ULONG length,const plot_font_style_t *fstyle,ULONG dx, ULONG dy)
{
uint16 *utf16 = NULL, *outf16 = NULL;
uint16 utf16next = 0;
int utf16charlen;
struct OutlineFont *ofont, *ufont = NULL;
ULONG i,gx,gy;
UWORD posn;
uint32 x=0;
uint8 co = 0;
int32 tempx = 0;
ULONG emwidth = (ULONG)((fstyle->size / FONT_SIZE_SCALE) * glob->scale);
if(!string || string[0]=='\0') return 0;
if(!length) return 0;
if(utf8_to_enc(string,"UTF-16",length,(char **)&utf16) != UTF8_CONVERT_OK) return 0;
outf16 = utf16;
if(!(ofont = ami_open_outline_font(fstyle, FALSE))) return 0;
if(rp) SetRPAttrs(rp,RPTAG_APenColor,p96EncodeColor(RGBFB_A8B8G8R8,fstyle->foreground),TAG_DONE);
while(*utf16 != 0)
{
if (*utf16 < 0xD800 || 0xDFFF < *utf16)
utf16charlen = 1;
else
utf16charlen = 2;
utf16next = utf16[utf16charlen];
tempx = ami_font_plot_glyph(ofont, rp, *utf16, utf16next, dx + x, dy, emwidth);
if(tempx == 0)
{
if(ufont == NULL)
{
ufont = ami_open_outline_font(fstyle, TRUE);
}
if(ufont)
{
tempx = ami_font_plot_glyph(ufont, rp, *utf16, utf16next,
dx + x, dy, emwidth);
}
/*
if(tempx == 0)
{
tempx = ami_font_plot_glyph(ofont, rp, 0xfffd, utf16next,
dx + x, dy, emwidth);
}
*/
}
x += tempx;
utf16 += utf16charlen;
}
free(outf16);
return x;
}
void ami_init_fonts(void)
{
int i;
char *bname,*iname,*biname;
char *deffont;
switch(option_font_default)
{
case PLOT_FONT_FAMILY_SANS_SERIF:
deffont = strdup(option_font_sans);
break;
case PLOT_FONT_FAMILY_SERIF:
deffont = strdup(option_font_serif);
break;
case PLOT_FONT_FAMILY_MONOSPACE:
deffont = strdup(option_font_mono);
break;
case PLOT_FONT_FAMILY_CURSIVE:
deffont = strdup(option_font_cursive);
break;
case PLOT_FONT_FAMILY_FANTASY:
deffont = strdup(option_font_fantasy);
break;
default:
deffont = strdup(option_font_sans);
break;
}
of[PLOT_FONT_FAMILY_SANS_SERIF] = OpenOutlineFont(option_font_sans,NULL,OFF_OPEN);
of[PLOT_FONT_FAMILY_SERIF] = OpenOutlineFont(option_font_serif,NULL,OFF_OPEN);
of[PLOT_FONT_FAMILY_MONOSPACE] = OpenOutlineFont(option_font_mono,NULL,OFF_OPEN);
of[PLOT_FONT_FAMILY_CURSIVE] = OpenOutlineFont(option_font_cursive,NULL,OFF_OPEN);
of[PLOT_FONT_FAMILY_FANTASY] = OpenOutlineFont(option_font_fantasy,NULL,OFF_OPEN);
of[NSA_UNICODE_FONT] = OpenOutlineFont(option_font_unicode,NULL,OFF_OPEN);
for(i=PLOT_FONT_FAMILY_SANS_SERIF;i<=NSA_UNICODE_FONT;i++)
{
if(!of[i])
{
char *tmpfontname = NULL;
switch(i)
{
case PLOT_FONT_FAMILY_SANS_SERIF:
tmpfontname = option_font_sans;
break;
case PLOT_FONT_FAMILY_SERIF:
tmpfontname = option_font_serif;
break;
case PLOT_FONT_FAMILY_MONOSPACE:
tmpfontname = option_font_mono;
break;
case PLOT_FONT_FAMILY_CURSIVE:
tmpfontname = option_font_cursive;
break;
case PLOT_FONT_FAMILY_FANTASY:
tmpfontname = option_font_fantasy;
break;
case NSA_UNICODE_FONT:
tmpfontname = option_font_unicode;
break;
default:
/* should never get here, but just in case */
tmpfontname = strdup("{unknown font}");
break;
}
warn_user("CompError",tmpfontname);
}
if(bname = (char *)GetTagData(OT_BName,0,of[i]->olf_OTagList))
{
ofb[i] = OpenOutlineFont(bname,NULL,OFF_OPEN);
}
else
{
ofb[i] = NULL;
}
if(iname = (char *)GetTagData(OT_IName,0,of[i]->olf_OTagList))
{
ofi[i] = OpenOutlineFont(iname,NULL,OFF_OPEN);
}
else
{
ofi[i] = NULL;
}
if(biname = (char *)GetTagData(OT_BIName,0,of[i]->olf_OTagList))
{
ofbi[i] = OpenOutlineFont(biname,NULL,OFF_OPEN);
}
else
{
ofbi[i] = NULL;
}
}
if(deffont) free(deffont);
}
void ami_close_fonts(void)
{
int i=0;
for(i=PLOT_FONT_FAMILY_SANS_SERIF;i<=NSA_UNICODE_FONT;i++)
{
if(of[i]) CloseOutlineFont(of[i],NULL);
if(ofb[i]) CloseOutlineFont(ofb[i],NULL);
if(ofi[i]) CloseOutlineFont(ofi[i],NULL);
if(ofbi[i]) CloseOutlineFont(ofbi[i],NULL);
}
}
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