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netsurf/amiga/font.c
John Mark Bell 41d2eca3b1 Port our UTF-8 routines to parserutils (only enabled when building against Hubbub). 
Sync our temporary internal copies of these functions with parserutils (which is rather better tested and fixes a number of known bugs in NetSurf's previous UTF-8 handling).
Ideally, this will be the only place in NetSurf that has any dependency on parserutils, so port the amiga font code to our internal APIs.

svn path=/trunk/netsurf/; revision=6550
2009-02-17 23:44:17 +00:00

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/*
* Copyright 2008,2009 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>
static struct OutlineFont *of[CSS_FONT_FAMILY_NOT_SET];
static struct OutlineFont *ofb[CSS_FONT_FAMILY_NOT_SET];
static struct OutlineFont *ofi[CSS_FONT_FAMILY_NOT_SET];
static struct OutlineFont *ofbi[CSS_FONT_FAMILY_NOT_SET];
struct OutlineFont *ami_open_outline_font(struct css_style *style);
static bool nsfont_width(const struct css_style *style,
const char *string, size_t length,
int *width);
static bool nsfont_position_in_string(const struct css_style *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x);
static bool nsfont_split(const struct css_style *style,
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 struct css_style *style,
const char *string, size_t length,
int *width)
{
struct TextFont *tfont;
if(option_quick_text)
{
tfont = ami_open_font(style);
*width = TextLength(currp,string,length); //buffer,strlen(buffer));
ami_close_font(tfont);
}
else
{
*width = ami_unicode_text(NULL,string,length,style,0,0,0);
}
return true;
}
/**
* Find the position in a string where an x coordinate falls.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \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 struct css_style *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
struct TextExtent extent;
struct TextFont *tfont;
if(option_quick_text)
{
tfont = ami_open_font(style);
*char_offset = TextFit(currp,string,length,
&extent,NULL,1,x,32767);
*actual_x = extent.te_Extent.MaxX;
ami_close_font(tfont);
}
else
{
uint16 *utf16 = NULL, *outf16 = NULL;
struct OutlineFont *ofont;
struct GlyphMap *glyph;
uint32 tx=0,i=0;
size_t len,utf8len;
uint8 *utf8;
uint32 co = 0;
len = utf8_bounded_length(string, length);
if(utf8_to_enc(string,"UTF-16",length,&utf16) != UTF8_CONVERT_OK) return;
outf16 = utf16;
if(!(ofont = ami_open_outline_font(style))) return 0;
*char_offset = length;
for(i=0;i<len;i++)
{
if(ESetInfo(&ofont->olf_EEngine,
OT_GlyphCode,*utf16,
TAG_END) == OTERR_Success)
{
if(EObtainInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,&glyph,
TAG_END) == 0)
{
*actual_x = tx;
if(utf8_from_enc(utf16,"UTF-16",4,&utf8) != UTF8_CONVERT_OK) return;
utf8len = utf8_char_byte_length(utf8);
free(utf8);
if(x<tx+glyph->glm_X1)
{
i = len+1;
}
else
{
co += utf8len;
}
tx+= glyph->glm_X1;
EReleaseInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,glyph,
TAG_END);
}
}
if (*utf16 < 0xD800 || 0xDFFF < *utf16)
utf16++;
else
utf16 += 2;
}
*char_offset = co;
free(outf16);
}
return true;
}
/**
* Find where to split a string to make it fit a width.
*
* \param style css_style for this text, with style->font_size.size ==
* CSS_FONT_SIZE_LENGTH
* \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 struct css_style *style,
const char *string, size_t length,
int x, size_t *char_offset, int *actual_x)
{
struct TextExtent extent;
ULONG co;
char *charp;
struct TextFont *tfont;
if(option_quick_text)
{
tfont = ami_open_font(style);
co = TextFit(currp,string,length,
&extent,NULL,1,x,32767);
charp = string+co;
while(((*charp != ' ')) && (charp > string))
{
charp--;
co--;
}
*char_offset = co;
if(string && co)
{
*actual_x = TextLength(currp,string,co);
}
else
{
*actual_x = 0;
}
ami_close_font(tfont);
}
else
{
uint16 *utf16 = NULL,*outf16 = NULL;
struct OutlineFont *ofont;
struct GlyphMap *glyph;
uint32 tx=0,i=0;
size_t len;
len = utf8_bounded_length(string, length);
if(utf8_to_enc(string,"UTF-16",length,&utf16) != UTF8_CONVERT_OK) return;
outf16 = utf16;
if(!(ofont = ami_open_outline_font(style))) return 0;
*char_offset = 0;
for(i=0;i<len;i++)
{
if(ESetInfo(&ofont->olf_EEngine,
OT_GlyphCode,*utf16,
TAG_END) == OTERR_Success)
{
if(EObtainInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,&glyph,
TAG_END) == 0)
{
if(*utf16 == 0x0020)
{
*actual_x = tx;
co = i;
}
if(x<tx+glyph->glm_X1)
{
i = length+1;
}
tx+= glyph->glm_X1;
EReleaseInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,glyph,
TAG_END);
}
}
if (*utf16 < 0xD800 || 0xDFFF < *utf16)
utf16++;
else
utf16 += 2;
}
charp = string+co;
while(((*charp != ' ')) && (charp > string))
{
charp--;
co--;
}
*char_offset = co;
free(outf16);
}
return true;
}
struct TextFont *ami_open_font(struct css_style *style)
{
struct TextFont *tfont;
struct TTextAttr tattr;
struct TagItem tattrtags[2];
char fontname[256];
switch(style->font_family)
{
case CSS_FONT_FAMILY_SANS_SERIF:
strcpy(fontname,option_font_sans);
break;
case CSS_FONT_FAMILY_SERIF:
strcpy(fontname,option_font_serif);
break;
case CSS_FONT_FAMILY_MONOSPACE:
strcpy(fontname,option_font_mono);
break;
case CSS_FONT_FAMILY_CURSIVE:
strcpy(fontname,option_font_cursive);
break;
case CSS_FONT_FAMILY_FANTASY:
strcpy(fontname,option_font_fantasy);
break;
default:
strcpy(fontname,option_font_sans);
break;
}
switch(style->font_style)
{
case CSS_FONT_STYLE_ITALIC:
case CSS_FONT_STYLE_OBLIQUE:
tattr.tta_Style = FSF_ITALIC;
break;
default:
tattr.tta_Style = FS_NORMAL;
break;
}
switch(style->font_weight)
{
case CSS_FONT_WEIGHT_BOLD:
case CSS_FONT_WEIGHT_BOLDER:
tattr.tta_Style |= FSF_BOLD;
break;
}
/* not supported
switch(style->font_variant)
{
default:
//printf("font variant: %ld\n",style->font_variant);
break;
}
*/
tattr.tta_YSize = css_len2px(&style->font_size.value.length, style);
if(tattr.tta_YSize < option_font_min_size)
tattr.tta_YSize = option_font_min_size;
tattr.tta_Flags = 0;
/* Uncommenting this changes the font's charset.
106 is UTF-8 but OS4 doesn't support it so this only results in a crash!
tattrtags[0].ti_Tag = TA_CharSet;
tattrtags[0].ti_Data = 106;
tattrtags[1].ti_Tag = TAG_DONE;
tattr.tta_Flags = FSB_TAGGED;
tattr.tta_Tags = &tattrtags;
*/
strcat(fontname,".font");
tattr.tta_Name = fontname;
tfont = OpenDiskFont((struct TextAttr *)&tattr);
if(tfont)
{
SetRPAttrs(currp,
RPTAG_Font,tfont,
TAG_DONE);
}
return tfont;
}
struct OutlineFont *ami_open_outline_font(struct css_style *style)
{
struct OutlineFont *ofont;
char *fontname;
WORD ysize;
int tstyle = 0;
switch(style->font_style)
{
case CSS_FONT_STYLE_ITALIC:
case CSS_FONT_STYLE_OBLIQUE:
tstyle += NSA_ITALIC;
break;
}
switch(style->font_weight)
{
case CSS_FONT_WEIGHT_BOLD:
case CSS_FONT_WEIGHT_BOLDER:
tstyle += NSA_BOLD;
break;
}
switch(tstyle)
{
case NSA_ITALIC:
if(ofi[style->font_family]) ofont = ofi[style->font_family];
else ofont = of[style->font_family];
break;
case NSA_BOLD:
if(ofb[style->font_family]) ofont = ofb[style->font_family];
else ofont = of[style->font_family];
break;
case NSA_BOLDITALIC:
if(ofbi[style->font_family]) ofont = ofbi[style->font_family];
else ofont = of[style->font_family];
break;
default:
ofont = of[style->font_family];
break;
}
ysize = css_len2pt(&style->font_size.value.length, style);
if(ysize < option_font_min_size)
ysize = option_font_min_size;
if(ESetInfo(&ofont->olf_EEngine,
OT_DeviceDPI,(72<<16) | 72,
OT_PointHeight,(ysize<<16),
TAG_END) == OTERR_Success)
{
return ofont;
}
return NULL;
}
void ami_close_font(struct TextFont *tfont)
{
SetRPAttrs(currp,
RPTAG_Font,origrpfont,
TAG_DONE);
if(tfont) CloseFont(tfont);
}
ULONG ami_unicode_text(struct RastPort *rp,char *string,ULONG length,struct css_style *style,ULONG dx, ULONG dy, ULONG c)
{
uint16 *utf16 = NULL, *outf16 = NULL;
struct OutlineFont *ofont;
struct GlyphMap *glyph;
ULONG i,gx,gy;
UBYTE *glyphbm;
UWORD posn;
struct BitMap *tbm;
struct RastPort trp;
uint32 width,height;
uint32 x=0,y=0;
size_t len;
if(!string || string[0]=='\0') return 0;
if(!length) return 0;
len = utf8_bounded_length(string, length);
if(utf8_to_enc(string,"UTF-16",length,&utf16) != UTF8_CONVERT_OK) return 0;
outf16 = utf16;
if(!(ofont = ami_open_outline_font(style))) return 0;
if(rp) SetRPAttrs(currp,RPTAG_APenColor,p96EncodeColor(RGBFB_A8B8G8R8,c),TAG_DONE);
dy++;
for(i=0;i<=len;i++)
{
if(ESetInfo(&ofont->olf_EEngine,
OT_GlyphCode,*utf16,
TAG_END) == OTERR_Success)
{
if(EObtainInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,&glyph,
TAG_END) == 0)
{
glyphbm = glyph->glm_BitMap;
if(!glyphbm) continue;
if(rp)
{
BltBitMapTags(BLITA_SrcX,glyph->glm_BlackLeft,
BLITA_SrcY,glyph->glm_BlackTop,
BLITA_DestX,dx+x,
BLITA_DestY,dy-glyph->glm_Y1,
BLITA_Width,glyph->glm_X1,
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);
}
x+= glyph->glm_X1;
EReleaseInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,glyph,
TAG_END);
}
}
if (*utf16 < 0xD800 || 0xDFFF < *utf16)
utf16++;
else
utf16 += 2;
}
free(outf16);
return x;
}
void ami_init_fonts(void)
{
int i;
char *bname,*iname,*biname;
if(!option_quick_text)
{
of[CSS_FONT_FAMILY_SANS_SERIF] = OpenOutlineFont(option_font_sans,NULL,OFF_OPEN);
of[CSS_FONT_FAMILY_SERIF] = OpenOutlineFont(option_font_serif,NULL,OFF_OPEN);
of[CSS_FONT_FAMILY_MONOSPACE] = OpenOutlineFont(option_font_mono,NULL,OFF_OPEN);
of[CSS_FONT_FAMILY_CURSIVE] = OpenOutlineFont(option_font_cursive,NULL,OFF_OPEN);
of[CSS_FONT_FAMILY_FANTASY] = OpenOutlineFont(option_font_fantasy,NULL,OFF_OPEN);
of[CSS_FONT_FAMILY_UNKNOWN] = OpenOutlineFont(option_font_sans,NULL,OFF_OPEN);
of[CSS_FONT_FAMILY_NOT_SET] = OpenOutlineFont(option_font_sans,NULL,OFF_OPEN);
for(i=CSS_FONT_FAMILY_SANS_SERIF;i<=CSS_FONT_FAMILY_NOT_SET;i++)
{
if(!of[i]) warn_user("FontError",""); // temporary error message
if(bname = GetTagData(OT_BName,0,of[i]->olf_OTagList))
{
ofb[i] = OpenOutlineFont(bname,NULL,OFF_OPEN);
}
else
{
ofb[i] = NULL;
}
if(iname = GetTagData(OT_IName,0,of[i]->olf_OTagList))
{
ofi[i] = OpenOutlineFont(iname,NULL,OFF_OPEN);
}
else
{
ofi[i] = NULL;
}
if(biname = GetTagData(OT_BIName,0,of[i]->olf_OTagList))
{
ofbi[i] = OpenOutlineFont(biname,NULL,OFF_OPEN);
}
else
{
ofbi[i] = NULL;
}
}
}
}
void ami_close_fonts(void)
{
int i=0;
if(!option_quick_text)
{
for(i=CSS_FONT_FAMILY_SANS_SERIF;i<=CSS_FONT_FAMILY_NOT_SET;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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