File: ft2.c

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#include "xdvi-config.h"
#include "xdvi.h"
#include <stdio.h>
#include <stdlib.h>

#ifdef	PTEX
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_SYNTHESIS_H

#include "kpathsea/tex-file.h"
#include "ft2.h"
#include "dvi-init.h"
#include "util.h"
#include "ptexmap.h"
#include "ft2vert.h"
#include "fontconfig.h"
#include "jisx0208.h"
#include "AJ16.c"

static struct jisv_st {
    int low, hi;
} jisv[] = {
    /* converted from CMap 'V' */
    /* sed -e '/^</!d' -e 's|<\(....\)> <\(....\)>.*|  { 0x\1, 0x\2 },|' < V */
    { 0x2122, 0x2123 },
    { 0x2131, 0x2132 },
    { 0x213c, 0x213e },
    { 0x2141, 0x2145 },
    { 0x214a, 0x215b },
    { 0x2161, 0x2161 },
    { 0x2421, 0x2421 },
    { 0x2423, 0x2423 },
    { 0x2425, 0x2425 },
    { 0x2427, 0x2427 },
    { 0x2429, 0x2429 },
    { 0x2443, 0x2443 },
    { 0x2463, 0x2463 },
    { 0x2465, 0x2465 },
    { 0x2467, 0x2467 },
    { 0x246e, 0x246e },
    { 0x2521, 0x2521 },
    { 0x2523, 0x2523 },
    { 0x2525, 0x2525 },
    { 0x2527, 0x2527 },
    { 0x2529, 0x2529 },
    { 0x2543, 0x2543 },
    { 0x2563, 0x2563 },
    { 0x2565, 0x2565 },
    { 0x2567, 0x2567 },
    { 0x256e, 0x256e },
    { 0x2575, 0x2576 },
};

Boolean is_jis_vertical(int jis)
{
    size_t l,r,m;

    l=0; r=sizeof(jisv)/sizeof(*jisv)-1;
    while (l<r) {
      m=(l+r)/2;
      if   (jisv[m].hi < jis) l=m+1;
      else r=m;
    }
    if (jisv[l].low <= jis && jis <= jisv[l].hi) return True;
    return False;
}

static FT_Library  library = NULL;

static int ft_fonts_num = 0;
static int ft_fonts_max = 0;
static struct ft_font {
    FT_Face face;
    short   height;
    short   width;
    short   ascend;
    int     encoding;
    Boolean bold;
    struct ft2vert_st *ft2vert;
} *ft_fonts;

static void ft2_init(void)
{
    int ft_error = FT_Init_FreeType( &library );
    if (ft_error != 0) {
	XDVI_WARNING(( stderr, "FreeType2: Initialization error.\n" ));
	exit(100);
    }
}

int ft2_open_font(struct ptexmap *map)
{
    int ft_error;
    char *fontpath = get_ptex_font_pathname(map->font_filename);
    struct ft_font *font;

    if (library == NULL) ft2_init();
    if (map->ft2_index >= 0) {  /* already opened */
	return map->ft2_index;
    }

    if (ft_fonts_num == ft_fonts_max) {
	if (ft_fonts_max == 0) ft_fonts_max = 8;
	else                   ft_fonts_max *= 2;
	ft_fonts = xrealloc(ft_fonts, sizeof(ft_fonts[0]) * ft_fonts_max);
    }
    font = &ft_fonts[ft_fonts_num];

    memset(font, 0, sizeof(*font));
    ft_error = FT_New_Face(library, fontpath, map->face_index, &font->face);
    free(fontpath);
    if (ft_error != 0) {
	XDVI_WARNING(( stderr, "FreeType2: Open Font Error (%s).  "
		       "Error code = %d \n", fontpath, ft_error ));
    } else {
	font->encoding = map->encoding;
	if (map->encoding == ENC_JIS_V || map->encoding == ENC_UNICODE_V) {
	    font->ft2vert = ft2vert_init(font->face);
	}
	font->bold = (map->variant & VAR_BOLD);
	if (map->variant & VAR_ITALIC) map->slant = 0.3;
	if (map->extend != 1.0 || map->slant != 0.0) {
	    /* for debug (attention upper if condition) */
	    /* FT_Vector vector = { 30 * (1<<6), -30 * (1<<6) }; */

	    /* t1_modify_fm() in tetex-src-3.0/texk/dvipsk/writet1.c */
	    FT_Matrix matrix;
	    matrix.xx = (int)(map->extend * (1<<16));
	    matrix.xy = (int)(map->extend * map->slant * (1<<16));
	    matrix.yx = 0;
	    matrix.yy = 1<<16;
	    FT_Set_Transform( font->face, &matrix, 0 );
	    /* TODO: vertical font */
	}
    }
    return (map->ft2_index = ft_fonts_num++);
}

static FT_UInt glyph_index(const int char_code, struct ft_font *font)
{
    FT_UInt i = char_code;  /* JIS or UNICODE or GID */

    if (font->encoding == ENC_JIS_H || font->encoding == ENC_JIS_V) {
	i = jis2uni(i);
    }
    else if (font->encoding == ENC_AJ16_H || font->encoding == ENC_AJ16_V) {
	i = AJ162uni(i);
    }
    if (font->encoding != ENC_IDENTITY) { /* unicode -> gid */
	i = FT_Get_Char_Index(font->face, i);
    }
    if ((font->encoding == ENC_JIS_V && is_jis_vertical(char_code)) ||
	font->encoding == ENC_UNICODE_V || font->encoding == ENC_AJ16_V) {
      if (font->ft2vert != NULL) i = ft2vert_get_gid(font->ft2vert, i);
    }
    return i;
}

static void glyph_to_bitmap(struct bitmap *bm, FT_GlyphSlot g, int ascend)
{
    int x, xmax, xshift;
    int y, ymax, yoffset;
    unsigned char *src, *dst;

    dst  = bm->bits;
    src  = g->bitmap.buffer;
    xmax = g->bitmap.pitch;
    ymax = g->bitmap.rows;

    if ( g->bitmap_left >= 0 ) {  /* to right */
	if ( g->bitmap_left % 8 != 0 ) xmax++;
	if ( xmax > bm->bytes_wide - g->bitmap_left/8 ) {
	    xmax = bm->bytes_wide - g->bitmap_left/8;
	}
	dst   += g->bitmap_left / 8;
	xshift = g->bitmap_left % 8;
    } else { /* to left */
	xmax  -=   (-g->bitmap_left) / 8;
	src   +=   (-g->bitmap_left) / 8;
	xshift = -((-g->bitmap_left) % 8);
	if ( xmax > bm->bytes_wide ) xmax = bm->bytes_wide;
    } /* We love plus % plus, we hate minus % plus. */
    assert( xmax <= bm->bytes_wide );

    if (g->bitmap_top == 0) {
        yoffset = 0;
    } else {
        yoffset = ascend - g->bitmap_top;
    }

    if ( yoffset >= 0 ) { /* to down */
	dst += yoffset * bm->bytes_wide;
	if (ymax > bm->h - yoffset) ymax = bm->h - yoffset;
    } else { /* to up */
	src  += (-yoffset) * g->bitmap.pitch;
	ymax -= (-yoffset);
	if ( ymax > bm->h ) ymax = bm->h;
    }

    if ( xmax<=0 || ymax<=0 ) return;
    for ( y=0; y<ymax; y++ ) {
	if ( xshift == 0 ) {
	    for ( x=0; x<xmax; x++ ) *dst++ = *src++;
	} else if ( xshift > 0 ) {
	    for ( x=0; x<xmax-1; x++ ) {
		*dst++ |= *src   >> xshift;
		*dst   |= *src++ << (8 - xshift);
	    }
	    dst++; src++;
	} else {
	    for ( x=0; x<xmax-1; x++ ) {
		*dst   |= *src++ << -xshift;
		*dst++ |= *src   >> (8 + xshift);
	    }
	    *dst++ |= *src++ << -xshift;
	}
	src += g->bitmap.pitch - xmax;
	dst += bm->bytes_wide  - xmax;
    }
    dst -= bm->bytes_wide - xmax;
    /* fprintf(stderr, "dst-bm->bits=%d, ", (char*)dst-(char*)bm->bits); */
    /* fprintf(stderr, "size=%d\n", bm->bytes_wide * bm->h); */
    assert((char*)dst <= (char*)bm->bits + bm->bytes_wide * bm->h);
}

int ft2_get_bitmap(long char_code, int ft2_index, struct bitmap *bm)
{
    struct ft_font *font = &ft_fonts[ft2_index];
    FT_Face face = font->face;

    clear_bitmap(bm);
    if (face == NULL) return 0;

    if ( font->width != bm->w || font->height != bm->h ) {
	FT_Set_Pixel_Sizes( face, bm->w, bm->h );
	font->width  = bm->w;
	font->height = bm->h;
	font->ascend =
	    bm->h * face->ascender
	    /  (face->ascender - face->descender);
    }

    if ( FT_Load_Glyph( face, glyph_index(char_code,font), FT_LOAD_DEFAULT )
	 != 0 ) {
	XDVI_WARNING(( stderr, "FreeType2: Failed in load glyph. "
		       "(char=0x%X)\n", char_code ));
	fill_bitmap(bm);
	return 0;
    }
    if ( font->bold ) FT_GlyphSlot_Embolden( face->glyph );
    if ( FT_Render_Glyph( face->glyph, FT_RENDER_MODE_MONO ) != 0 ) {
	XDVI_WARNING(( stderr, "FreeType2: Failed in render glyph. "
		       "(char=0x%X)\n", char_code ));
	fill_bitmap(bm);
	return 0;
    }
    glyph_to_bitmap( bm, face->glyph, font->ascend );
    return font->ascend;
}

#endif	/* PTEX */