forked from minhngoc25a/freetype2
[gf] Initialised internal utility functions specific to GF format.
* src/gf/gf.h Added some required definitions. * src/gf/gflib.c Added gf_font_load, gf_read_glyph, gf_font_done functions.
This commit is contained in:
Parth Wazurkar
parent
9a53ba425e
commit
10c4f0bd4e
10
src/gf/gf.h
10
src/gf/gf.h
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@ -58,6 +58,16 @@ FT_BEGIN_HEADER
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#define GF_YYY 243
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#define GF_NO_OP 244
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typedef char INT1;
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typedef unsigned char UINT1;
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typedef int INT2;
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typedef unsigned int UINT2;
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typedef long INT3;
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typedef unsigned long UINT3;
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typedef long INT4;
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typedef unsigned long UINT4;
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FT_END_HEADER
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@ -0,0 +1,498 @@
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/***************************************************************************/
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/* */
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/* gfdrivr.h */
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/* */
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/* FreeType font driver for TeX's GF FONT files */
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/* */
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/* Copyright 1996-2018 by */
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/* David Turner, Robert Wilhelm, and Werner Lemberg. */
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/* */
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/* This file is part of the FreeType project, and may only be used, */
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/* modified, and distributed under the terms of the FreeType project */
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/* license, LICENSE.TXT. By continuing to use, modify, or distribute */
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/* this file you indicate that you have read the license and */
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/* understand and accept it fully. */
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/* */
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/***************************************************************************/
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#include <ft2build.h>
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#include FT_FREETYPE_H
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#include FT_INTERNAL_DEBUG_H
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#include FT_INTERNAL_STREAM_H
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#include FT_INTERNAL_OBJECTS_H
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#include "gf.h"
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#include "gferror.h"
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/*************************************************************************/
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/* */
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/* The macro FT_COMPONENT is used in trace mode. It is an implicit */
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/* parameter of the FT_TRACE() and FT_ERROR() macros, used to print/log */
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/* messages during execution. */
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/* */
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#undef FT_COMPONENT
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#define FT_COMPONENT trace_gflib
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/*************************************************************************/
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/* */
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/* GF font utility functions. */
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/* */
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/*************************************************************************/
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long gf_read_intn(FILE*,int);
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unsigned long gf_read_uintn(FILE*,int);
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void gf_skip_n(FILE*,int);
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#define READ_INT1(fp) (INT1)gf_read_intn((fp), 1)
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#define READ_UINT1(fp) (UINT1)gf_read_uintn((fp), 1)
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#define READ_INT2(fp) (INT2)gf_read_intn((fp), 2)
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#define READ_UINT2(fp) (UINT2)gf_read_uintn((fp), 2)
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#define READ_INT3(fp) (INT3)gf_read_intn((fp), 3)
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#define READ_UINT3(fp) (UINT3)gf_read_uintn((fp), 3)
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#define READ_INT4(fp) (INT4)gf_read_intn((fp), 4)
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#define READ_UINT4(fp) (UINT4)gf_read_uintn((fp), 4)
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#define READ_INTN(fp,n) (INT4)gf_read_intn((fp), (n))
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#define READ_UINTN(fp,n) (UINT4)gf_read_uintn((fp), (n))
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#define SKIP_N(fp,k) gf_skip_n((fp), (k))
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/*
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* Reading a Number from file
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*/
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unsigned long
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gf_read_uintn(FILE* fp, int size)
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{
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unsigned long v;
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v = 0L;
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while (size >= 1)
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{
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v = v*256L + (unsigned long)getc(fp);
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--size;
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}
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return v;
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}
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long
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gf_read_intn(FILE* fp, int size)
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{
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long v;
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v = (long)getc(fp) & 0xffL;
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if (v & 0x80L)
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v = v - 256L;
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--size;
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while (size >= 1){
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v = v*256L + (unsigned long)getc(fp);
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--size;
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}
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return v;
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}
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void
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gf_skip_n(FILE* fp, int size)
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{
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while (size > 0)
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{
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(void)getc(fp);
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--size;
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}
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}
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unsigned long
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gf_get_uintn(unsigned char *p, int size)
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{
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unsigned long v;
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v = 0L;
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while (size >= 1)
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{
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v = v*256L + (unsigned long) *(p++);
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--size;
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}
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return v;
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}
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long
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gf_get_intn(unsigned char *p, int size)
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{
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long v;
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v = (long)*(p++) & 0xffL;
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if (v & 0x80L)
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v = v - 256L;
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--size;
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while (size >= 1)
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{
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v = v*256L + (unsigned long) *(p++);
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--size;
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}
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return v;
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}
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/*************************************************************************/
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/* */
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/* API. */
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/* */
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/*************************************************************************/
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FT_LOCAL_DEF( FT_Error )
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gf_read_glyph(FT_FILE* fp, GF_BITMAP bm)
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{
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long m, n;
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int paint_sw;
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int instr;
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INT4 min_m, max_m, min_n, max_n, del_m, del_n;
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long w, h, d;
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int m_b, k;
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unsigned char *ptr;
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switch (READ_UINT1(fp))
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{
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case GF_BOC:
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SKIP_N(fp, 4);
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SKIP_N(fp, 4);
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min_m = READ_INT4(fp);
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max_m = READ_INT4(fp);
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min_n = READ_INT4(fp);
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max_n = READ_INT4(fp);
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break;
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case GF_BOC1:
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SKIP_N(fp, 1);
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del_m = (INT4)READ_UINT1(fp);
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max_m = (INT4)READ_UINT1(fp);
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del_n = (INT4)READ_UINT1(fp);
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max_n = (INT4)READ_UINT1(fp);
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min_m = max_m - del_m;
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min_n = max_n - del_n;
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break;
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default:
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return -1;
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}
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w = max_m - min_m + 1;
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h = max_n - min_n + 1;
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if ((w < 0) || (h < 0))
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{
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vf_error = VF_ERR_ILL_FONT_FILE;
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return -1;
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}
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if ((bm->bitmap = (unsigned char*)malloc(h*((w+7)/8))) == NULL)
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{
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vf_error = VF_ERR_NO_MEMORY;
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return -1;
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}
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memclr(bm->bitmap, h*((w+7)/8));
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bm->raster = (w+7)/8;
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bm->bbx_width = w;
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bm->bbx_height = h;
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bm->off_x = -min_m;
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bm->off_y = max_n;
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#if 0
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bm->mv_x = -min_m;
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bm->mv_y = max_n;
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#endif
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m = min_m;
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n = max_n;
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paint_sw = 0;
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while ((instr = (int)READ_UINT1(fp)) != GF_EOC)
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{
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if (instr == GF_PAINT_0)
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{
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paint_sw = 1 - paint_sw;
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}
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else if ((GF_NEW_ROW_0 <= instr) && (instr <= GF_NEW_ROW_164))
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{
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m = min_m + (instr - GF_NEW_ROW_0);
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n = n - 1;
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paint_sw = 1;
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}
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else if ((GF_PAINT_1 <= instr) && (instr <= GF_PAINT_63))
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{
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d = (instr - GF_PAINT_1 + 1);
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goto Paint;
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}
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else
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{
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switch ((int)instr)
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{
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case GF_PAINT1:
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case GF_PAINT2:
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case GF_PAINT3:
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d = (UINT4)READ_UINTN(fp, (instr - GF_PAINT1 + 1));
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Paint:
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if (paint_sw == 0)
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{
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m = m + d;
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}
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else
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{
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ptr = &bm->bitmap[(max_n - n) * bm->raster + (m - min_m)/8];
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m_b = (m - min_m) % 8;
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while (d > 0)
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{
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*ptr |= bit_table[m_b];
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m++;
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if (++m_b >= 8)
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{
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m_b = 0;
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++ptr;
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}
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d--;
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}
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}
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paint_sw = 1 - paint_sw;
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break;
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case GF_SKIP0:
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m = min_m;
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n = n - 1;
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paint_sw = 0;
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break;
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case GF_SKIP1:
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case GF_SKIP2:
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case GF_SKIP3:
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m = min_m;
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n = n - (UINT4)READ_UINTN(fp, (instr - GF_SKIP1 + 1)) - 1;
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paint_sw = 0;
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break;
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case GF_XXX1:
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case GF_XXX2:
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case GF_XXX3:
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case GF_XXX4:
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k = READ_UINTN(fp, instr - GF_XXX1 + 1);
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SKIP_N(fp, k);
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break;
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case GF_YYY:
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SKIP_N(fp, 4);
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break;
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case GF_NO_OP:
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break;
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default:
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vf_free(bm->bitmap);
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bm->bitmap = NULL;
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vf_error = VF_ERR_ILL_FONT_FILE;
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return -1;
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}
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}
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}
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return 0;
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}
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FT_LOCAL_DEF( FT_Error )
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gf_load_font( FT_Stream stream,
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GF_Face face )
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{
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GF_GLYPH go;
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GF_BITMAP bm;
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UINT1 instr, d;
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UINT4 ds, check_sum, hppp, vppp;
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INT4 min_m, max_m, min_n, max_n;
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INT4 w;
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UINT4 code;
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double dx, dy;
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long ptr_post, ptr_p, ptr, optr, gptr;
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int bc, ec, nchars, i;
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FT_FILE *fp = stream->descriptor.pointer
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go = NULL;
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nchars = -1;
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/* seek to post_post instr. */
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ft_fseek(fp, -1, SEEK_END);
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while ((d = READ_UINT1(fp)) == 223)
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fseek(fp, -2, SEEK_CUR);
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if (d != GF_ID)
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{
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vf_error = VF_ERR_ILL_FONT_FILE;
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goto ErrExit;
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}
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fseek(fp, -6, SEEK_CUR);
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/* check if the code is post_post */
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if (READ_UINT1(fp) != GF_POST_POST)
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{
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vf_error = VF_ERR_ILL_FONT_FILE;
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goto ErrExit;
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}
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/* read pointer to post instr. */
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if ((ptr_post = READ_UINT4(fp)) == -1)
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{
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vf_error = VF_ERR_ILL_FONT_FILE;
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goto ErrExit;
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}
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/* goto post instr. and read it */
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fseek(fp, ptr_post, SEEK_SET);
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if (READ_UINT1(fp) != GF_POST)
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{
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vf_error = VF_ERR_ILL_FONT_FILE;
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goto ErrExit;
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}
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ptr_p = READ_UINT4(fp);
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ds = READ_UINT4(fp);
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check_sum = READ_UINT4(fp);
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hppp = READ_UINT4(fp);
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vppp = READ_UINT4(fp);
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min_m = READ_INT4(fp);
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max_m = READ_INT4(fp);
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min_n = READ_INT4(fp);
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max_n = READ_INT4(fp);
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gptr = ftell(fp);
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#if 0
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/* read min & max char code */
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bc = 256;
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ec = -1;
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for (;;){
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instr = READ_UINT1(fp);
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if (instr == GF_POST_POST){
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break;
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} else if (instr == GF_CHAR_LOC){
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code = READ_UINT1(fp);
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(void)SKIP_N(fp, 16);
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} else if (instr == GF_CHAR_LOC0){
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code = READ_UINT1(fp);
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(void)SKIP_N(fp, 9);
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} else {
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vf_error = VF_ERR_ILL_FONT_FILE;
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goto ErrExit;
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}
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if (code < bc)
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bc = code;
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if (code > ec)
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ec = code;
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}
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#else
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bc = 0;
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ec = 255;
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#endif
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nchars = ec - bc + 1;
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ALLOC_IF_ERR(go, struct s_gf_glyph)
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{
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vf_error = VF_ERR_NO_MEMORY;
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goto ErrExit;
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}
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ALLOCN_IF_ERR(go->bm_table, struct vf_s_bitmap, nchars)
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{
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vf_error = VF_ERR_NO_MEMORY;
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goto ErrExit;
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}
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for (i = 0; i < nchars; i++)
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go->bm_table[i].bitmap = NULL;
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go->ds = (double)ds/(1<<20);
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go->hppp = (double)hppp/(1<<16);
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go->vppp = (double)vppp/(1<<16);
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go->font_bbx_w = max_m - min_m;
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go->font_bbx_h = max_n - min_n;
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go->font_bbx_xoff = min_m;
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go->font_bbx_yoff = min_n;
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go->code_min = bc;
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go->code_max = ec;
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/* read glyph */
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#if 0
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fseek(fp, gptr, SEEK_SET);
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#endif
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for (;;)
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{
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if ((instr = READ_UINT1(fp)) == GF_POST_POST)
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break;
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switch ((int)instr)
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{
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case GF_CHAR_LOC:
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code = READ_UINT1(fp);
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dx = (double)READ_INT4(fp)/(double)(1<<16);
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dy = (double)READ_INT4(fp)/(double)(1<<16);
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w = READ_INT4(fp);
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ptr = READ_INT4(fp);
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break;
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case GF_CHAR_LOC0:
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code = READ_UINT1(fp);
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dx = (double)READ_INT1(fp);
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dy = (double)0;
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w = READ_INT4(fp);
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ptr = READ_INT4(fp);
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break;
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default:
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vf_error = VF_ERR_ILL_FONT_FILE;
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goto ErrExit;
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}
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optr = ftell(fp);
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fseek(fp, ptr, SEEK_SET);
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bm = &go->bm_table[code - bc];
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if (gf_read_glyph(fp, bm) < 0)
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goto ErrExit;
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bm->mv_x = dx;
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bm->mv_y = dy;
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fseek(fp, optr, SEEK_SET);
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}
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return go;
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ErrExit:
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printf("*ERROR\n");
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if (go != NULL)
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{
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if (go->bm_table != NULL)
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{
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for (i = 0; i < nchars; i++)
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vf_free(go->bm_table[i].bitmap);
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}
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vf_free(go->bm_table);
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}
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vf_free(go);
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return NULL;
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}
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FT_LOCAL_DEF( void )
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gf_free_font( GF_Glyph gf_glyph )
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{
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if (go != NULL)
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{
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if (go->bm_table != NULL)
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{
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for (i = 0; i < nchars; i++)
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vf_free(go->bm_table[i].bitmap);
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}
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vf_free(go->bm_table);
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}
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vf_free(go);
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}
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/* END */
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