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netsurf/amiga/font.c
Chris Young 3921fcf173 Fix character offset, which was one character left of where the user clicked even 
though the caret itself was placed in the correct location.

svn path=/trunk/netsurf/; revision=10128
2010-03-14 22:48:25 +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>
#include "utils/utils.h"
static struct OutlineFont *of[PLOT_FONT_FAMILY_COUNT];
static struct OutlineFont *ofb[PLOT_FONT_FAMILY_COUNT];
static struct OutlineFont *ofi[PLOT_FONT_FAMILY_COUNT];
static struct OutlineFont *ofbi[PLOT_FONT_FAMILY_COUNT];
struct OutlineFont *ami_open_outline_font(const plot_font_style_t *fstyle);
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)
{
struct TextFont *tfont;
*width = ami_unicode_text(NULL,string,length,fstyle,0,0);
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;
struct OutlineFont *ofont;
struct GlyphMap *glyph;
uint32 tx=0,i=0;
size_t len, utf8len = 0;
uint8 *utf8;
uint32 co = 0;
int utf16charlen;
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))) 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);
if(ESetInfo(&ofont->olf_EEngine,
OT_GlyphCode,*utf16,
TAG_END) == OTERR_Success)
{
if(EObtainInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,&glyph,
TAG_END) == 0)
{
if(x < (tx + glyph->glm_X1))
{
*actual_x = tx;
i = len+1;
}
else
{
co += utf8len;
}
tx += glyph->glm_X1;
EReleaseInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,glyph,
TAG_END);
}
}
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;
struct OutlineFont *ofont;
struct GlyphMap *glyph;
uint32 tx=0,i=0;
size_t len;
int utf8len, utf8clen = 0;
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))) return false;
*char_offset = 0;
*actual_x = 0;
for(i=0;i<len;i++)
{
utf8len = utf8_char_byte_length(string+utf8clen);
if(ESetInfo(&ofont->olf_EEngine,
OT_GlyphCode,*utf16,
TAG_END) == OTERR_Success)
{
if(EObtainInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,&glyph,
TAG_END) == 0)
{
if(x < tx)
{
i = length+1;
}
else
{
if(string[utf8clen] == ' ') //*utf16 == 0x0020)
{
*actual_x = tx;
*char_offset = utf8clen;
}
}
tx+= glyph->glm_X1;
EReleaseInfo(&ofont->olf_EEngine,
OT_GlyphMap8Bit,glyph,
TAG_END);
}
}
if (*utf16 < 0xD800 || 0xDFFF < *utf16)
utf16 += 1;
else
utf16 += 2;
utf8clen += utf8len;
}
free(outf16);
return true;
}
struct OutlineFont *ami_open_outline_font(const plot_font_style_t *fstyle)
{
struct OutlineFont *ofont;
char *fontname;
ULONG ysize;
int tstyle = 0;
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[fstyle->family]) ofont = ofi[fstyle->family];
else ofont = of[fstyle->family];
break;
case NSA_BOLD:
if(ofb[fstyle->family]) ofont = ofb[fstyle->family];
else ofont = of[fstyle->family];
break;
case NSA_BOLDITALIC:
if(ofbi[fstyle->family]) ofont = ofbi[fstyle->family];
else ofont = of[fstyle->family];
break;
default:
ofont = of[fstyle->family];
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;
}
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;
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;
uint8 co = 0;
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,(char **)&utf16) != UTF8_CONVERT_OK) return 0;
outf16 = utf16;
if(!(ofont = ami_open_outline_font(fstyle))) return 0;
if(rp) SetRPAttrs(rp,RPTAG_APenColor,p96EncodeColor(RGBFB_A8B8G8R8,fstyle->foreground),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;
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);
for(i=PLOT_FONT_FAMILY_SANS_SERIF;i<=PLOT_FONT_FAMILY_FANTASY;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;
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<=PLOT_FONT_FAMILY_FANTASY;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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