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agg_font_freetype.cpp
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agg_font_freetype.cpp
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//----------------------------------------------------------------------------
// Anti-Grain Geometry - Version 2.4
// Copyright (C) 2002-2005 Maxim Shemanarev (http://www.antigrain.com)
//
// Permission to copy, use, modify, sell and distribute this software
// is granted provided this copyright notice appears in all copies.
// This software is provided "as is" without express or implied
// warranty, and with no claim as to its suitability for any purpose.
//
//----------------------------------------------------------------------------
// Contact: mcseem@antigrain.com
// mcseemagg@yahoo.com
// http://www.antigrain.com
//----------------------------------------------------------------------------
#include <stdio.h>
#include "../include/agg_font_freetype.h"
#include "../include/agg_bitset_iterator.h"
#include "../include/agg_renderer_scanline.h"
namespace mapserver
{
//------------------------------------------------------------------------------
//
// This code implements the AUTODIN II polynomial
// The variable corresponding to the macro argument "crc" should
// be an unsigned long.
// Oroginal code by Spencer Garrett <srg@quick.com>
//
// generated using the AUTODIN II polynomial
// x^32 + x^26 + x^23 + x^22 + x^16 +
// x^12 + x^11 + x^10 + x^8 + x^7 + x^5 + x^4 + x^2 + x^1 + 1
//
//------------------------------------------------------------------------------
static const unsigned crc32tab[256] =
{
0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};
//------------------------------------------------------------------------------
static unsigned calc_crc32(const unsigned char* buf, unsigned size)
{
unsigned crc = (unsigned)~0;
const unsigned char* p;
unsigned len = 0;
unsigned nr = size;
for (len += nr, p = buf; nr--; ++p)
{
crc = (crc >> 8) ^ crc32tab[(crc ^ *p) & 0xff];
}
return ~crc;
}
//------------------------------------------------------------------------
static inline int dbl_to_plain_fx(double d)
{
return int(d * 65536.0);
}
//------------------------------------------------------------------------
static inline double int26p6_to_dbl(int p)
{
return double(p) / 64.0;
}
//------------------------------------------------------------------------
static inline int dbl_to_int26p6(double p)
{
return int(p * 64.0 + 0.5);
}
//------------------------------------------------------------------------
template<class PathStorage>
bool decompose_ft_outline(const FT_Outline& outline,
bool flip_y,
const trans_affine& mtx,
PathStorage& path)
{
typedef typename PathStorage::value_type value_type;
FT_Vector v_last;
FT_Vector v_control;
FT_Vector v_start;
double x1, y1, x2, y2, x3, y3;
FT_Vector* point;
FT_Vector* limit;
char* tags;
int n; // index of contour in outline
int first; // index of first point in contour
char tag; // current point's state
first = 0;
for(n = 0; n < outline.n_contours; n++)
{
int last; // index of last point in contour
last = outline.contours[n];
limit = outline.points + last;
v_start = outline.points[first];
v_last = outline.points[last];
v_control = v_start;
point = outline.points + first;
tags = outline.tags + first;
tag = FT_CURVE_TAG(tags[0]);
// A contour cannot start with a cubic control point!
if(tag == FT_CURVE_TAG_CUBIC) return false;
// check first point to determine origin
if( tag == FT_CURVE_TAG_CONIC)
{
// first point is conic control. Yes, this happens.
if(FT_CURVE_TAG(outline.tags[last]) == FT_CURVE_TAG_ON)
{
// start at last point if it is on the curve
v_start = v_last;
limit--;
}
else
{
// if both first and last points are conic,
// start at their middle and record its position
// for closure
v_start.x = (v_start.x + v_last.x) / 2;
v_start.y = (v_start.y + v_last.y) / 2;
v_last = v_start;
}
point--;
tags--;
}
x1 = int26p6_to_dbl(v_start.x);
y1 = int26p6_to_dbl(v_start.y);
if(flip_y) y1 = -y1;
mtx.transform(&x1, &y1);
path.move_to(value_type(dbl_to_int26p6(x1)),
value_type(dbl_to_int26p6(y1)));
while(point < limit)
{
point++;
tags++;
tag = FT_CURVE_TAG(tags[0]);
switch(tag)
{
case FT_CURVE_TAG_ON: // emit a single line_to
{
x1 = int26p6_to_dbl(point->x);
y1 = int26p6_to_dbl(point->y);
if(flip_y) y1 = -y1;
mtx.transform(&x1, &y1);
path.line_to(value_type(dbl_to_int26p6(x1)),
value_type(dbl_to_int26p6(y1)));
//path.line_to(conv(point->x), flip_y ? -conv(point->y) : conv(point->y));
continue;
}
case FT_CURVE_TAG_CONIC: // consume conic arcs
{
v_control.x = point->x;
v_control.y = point->y;
Do_Conic:
if(point < limit)
{
FT_Vector vec;
FT_Vector v_middle;
point++;
tags++;
tag = FT_CURVE_TAG(tags[0]);
vec.x = point->x;
vec.y = point->y;
if(tag == FT_CURVE_TAG_ON)
{
x1 = int26p6_to_dbl(v_control.x);
y1 = int26p6_to_dbl(v_control.y);
x2 = int26p6_to_dbl(vec.x);
y2 = int26p6_to_dbl(vec.y);
if(flip_y) { y1 = -y1; y2 = -y2; }
mtx.transform(&x1, &y1);
mtx.transform(&x2, &y2);
path.curve3(value_type(dbl_to_int26p6(x1)),
value_type(dbl_to_int26p6(y1)),
value_type(dbl_to_int26p6(x2)),
value_type(dbl_to_int26p6(y2)));
continue;
}
if(tag != FT_CURVE_TAG_CONIC) return false;
v_middle.x = (v_control.x + vec.x) / 2;
v_middle.y = (v_control.y + vec.y) / 2;
x1 = int26p6_to_dbl(v_control.x);
y1 = int26p6_to_dbl(v_control.y);
x2 = int26p6_to_dbl(v_middle.x);
y2 = int26p6_to_dbl(v_middle.y);
if(flip_y) { y1 = -y1; y2 = -y2; }
mtx.transform(&x1, &y1);
mtx.transform(&x2, &y2);
path.curve3(value_type(dbl_to_int26p6(x1)),
value_type(dbl_to_int26p6(y1)),
value_type(dbl_to_int26p6(x2)),
value_type(dbl_to_int26p6(y2)));
//path.curve3(conv(v_control.x),
// flip_y ? -conv(v_control.y) : conv(v_control.y),
// conv(v_middle.x),
// flip_y ? -conv(v_middle.y) : conv(v_middle.y));
v_control = vec;
goto Do_Conic;
}
x1 = int26p6_to_dbl(v_control.x);
y1 = int26p6_to_dbl(v_control.y);
x2 = int26p6_to_dbl(v_start.x);
y2 = int26p6_to_dbl(v_start.y);
if(flip_y) { y1 = -y1; y2 = -y2; }
mtx.transform(&x1, &y1);
mtx.transform(&x2, &y2);
path.curve3(value_type(dbl_to_int26p6(x1)),
value_type(dbl_to_int26p6(y1)),
value_type(dbl_to_int26p6(x2)),
value_type(dbl_to_int26p6(y2)));
//path.curve3(conv(v_control.x),
// flip_y ? -conv(v_control.y) : conv(v_control.y),
// conv(v_start.x),
// flip_y ? -conv(v_start.y) : conv(v_start.y));
goto Close;
}
default: // FT_CURVE_TAG_CUBIC
{
FT_Vector vec1, vec2;
if(point + 1 > limit || FT_CURVE_TAG(tags[1]) != FT_CURVE_TAG_CUBIC)
{
return false;
}
vec1.x = point[0].x;
vec1.y = point[0].y;
vec2.x = point[1].x;
vec2.y = point[1].y;
point += 2;
tags += 2;
if(point <= limit)
{
FT_Vector vec;
vec.x = point->x;
vec.y = point->y;
x1 = int26p6_to_dbl(vec1.x);
y1 = int26p6_to_dbl(vec1.y);
x2 = int26p6_to_dbl(vec2.x);
y2 = int26p6_to_dbl(vec2.y);
x3 = int26p6_to_dbl(vec.x);
y3 = int26p6_to_dbl(vec.y);
if(flip_y) { y1 = -y1; y2 = -y2; y3 = -y3; }
mtx.transform(&x1, &y1);
mtx.transform(&x2, &y2);
mtx.transform(&x3, &y3);
path.curve4(value_type(dbl_to_int26p6(x1)),
value_type(dbl_to_int26p6(y1)),
value_type(dbl_to_int26p6(x2)),
value_type(dbl_to_int26p6(y2)),
value_type(dbl_to_int26p6(x3)),
value_type(dbl_to_int26p6(y3)));
//path.curve4(conv(vec1.x),
// flip_y ? -conv(vec1.y) : conv(vec1.y),
// conv(vec2.x),
// flip_y ? -conv(vec2.y) : conv(vec2.y),
// conv(vec.x),
// flip_y ? -conv(vec.y) : conv(vec.y));
continue;
}
x1 = int26p6_to_dbl(vec1.x);
y1 = int26p6_to_dbl(vec1.y);
x2 = int26p6_to_dbl(vec2.x);
y2 = int26p6_to_dbl(vec2.y);
x3 = int26p6_to_dbl(v_start.x);
y3 = int26p6_to_dbl(v_start.y);
if(flip_y) { y1 = -y1; y2 = -y2; y3 = -y3; }
mtx.transform(&x1, &y1);
mtx.transform(&x2, &y2);
mtx.transform(&x3, &y3);
path.curve4(value_type(dbl_to_int26p6(x1)),
value_type(dbl_to_int26p6(y1)),
value_type(dbl_to_int26p6(x2)),
value_type(dbl_to_int26p6(y2)),
value_type(dbl_to_int26p6(x3)),
value_type(dbl_to_int26p6(y3)));
//path.curve4(conv(vec1.x),
// flip_y ? -conv(vec1.y) : conv(vec1.y),
// conv(vec2.x),
// flip_y ? -conv(vec2.y) : conv(vec2.y),
// conv(v_start.x),
// flip_y ? -conv(v_start.y) : conv(v_start.y));
goto Close;
}
}
}
path.close_polygon();
Close:
first = last + 1;
}
return true;
}
//------------------------------------------------------------------------
template<class Scanline, class ScanlineStorage>
void decompose_ft_bitmap_mono(const FT_Bitmap& bitmap,
int x, int y,
bool flip_y,
Scanline& sl,
ScanlineStorage& storage)
{
unsigned int i;
const int8u* buf = (const int8u*)bitmap.buffer;
int pitch = bitmap.pitch;
sl.reset(x, x + bitmap.width);
storage.prepare();
if(flip_y)
{
buf += bitmap.pitch * (bitmap.rows - 1);
y += bitmap.rows;
pitch = -pitch;
}
for(i = 0; i < (unsigned int)bitmap.rows; i++)
{
sl.reset_spans();
bitset_iterator bits(buf, 0);
unsigned int j;
for(j = 0; j < (unsigned int)bitmap.width; j++)
{
if(bits.bit()) sl.add_cell(x + j, cover_full);
++bits;
}
buf += pitch;
if(sl.num_spans())
{
sl.finalize(y - i - 1);
storage.render(sl);
}
}
}
//------------------------------------------------------------------------
template<class Rasterizer, class Scanline, class ScanlineStorage>
void decompose_ft_bitmap_gray8(const FT_Bitmap& bitmap,
int x, int y,
bool flip_y,
Rasterizer& ras,
Scanline& sl,
ScanlineStorage& storage)
{
unsigned int i, j;
const int8u* buf = (const int8u*)bitmap.buffer;
int pitch = bitmap.pitch;
sl.reset(x, x + bitmap.width);
storage.prepare();
if(flip_y)
{
buf += bitmap.pitch * (bitmap.rows - 1);
y += bitmap.rows;
pitch = -pitch;
}
for(i = 0; i < (unsigned int)bitmap.rows; i++)
{
sl.reset_spans();
const int8u* p = buf;
for(j = 0; j < (unsigned int)bitmap.width; j++)
{
if(*p) sl.add_cell(x + j, ras.apply_gamma(*p));
++p;
}
buf += pitch;
if(sl.num_spans())
{
sl.finalize(y - i - 1);
storage.render(sl);
}
}
}
//------------------------------------------------------------------------
font_engine_freetype_base::~font_engine_freetype_base()
{
unsigned i;
for(i = 0; i < m_num_faces; ++i)
{
delete [] m_face_names[i];
FT_Done_Face(m_faces[i]);
}
delete [] m_face_names;
delete [] m_faces;
delete [] m_signature;
if(m_library_initialized) FT_Done_FreeType(m_library);
}
//------------------------------------------------------------------------
font_engine_freetype_base::font_engine_freetype_base(bool flag32,
unsigned max_faces) :
m_flag32(flag32),
m_change_stamp(0),
m_last_error(0),
m_name(0),
m_name_len(256-16-1),
m_face_index(0),
m_char_map(FT_ENCODING_NONE),
m_signature(new char [256+256-16]),
m_height(0),
m_width(0),
m_hinting(true),
m_flip_y(false),
m_library_initialized(false),
m_library(0),
m_faces(new FT_Face [max_faces]),
m_face_names(new char* [max_faces]),
m_num_faces(0),
m_max_faces(max_faces),
m_cur_face(0),
m_resolution(0),
m_glyph_rendering(glyph_ren_native_gray8),
m_glyph_index(0),
m_data_size(0),
m_data_type(glyph_data_invalid),
m_bounds(1,1,0,0),
m_advance_x(0.0),
m_advance_y(0.0),
m_path16(),
m_path32(),
m_curves16(m_path16),
m_curves32(m_path32),
m_scanline_aa(),
m_scanline_bin(),
m_scanlines_aa(),
m_scanlines_bin(),
m_rasterizer()
{
m_curves16.approximation_scale(4.0);
m_curves32.approximation_scale(4.0);
m_last_error = FT_Init_FreeType(&m_library);
if(m_last_error == 0) m_library_initialized = true;
}
//------------------------------------------------------------------------
void font_engine_freetype_base::resolution(unsigned dpi)
{
m_resolution = dpi;
update_char_size();
}
//------------------------------------------------------------------------
int font_engine_freetype_base::find_face(const char* face_name) const
{
unsigned i;
for(i = 0; i < m_num_faces; ++i)
{
if(strcmp(face_name, m_face_names[i]) == 0) return i;
}
return -1;
}
//------------------------------------------------------------------------
double font_engine_freetype_base::ascender() const
{
if(m_cur_face)
{
return m_cur_face->ascender * height() / m_cur_face->height;
}
return 0.0;
}
//------------------------------------------------------------------------
double font_engine_freetype_base::descender() const
{
if(m_cur_face)
{
return m_cur_face->descender * height() / m_cur_face->height;
}
return 0.0;
}
//------------------------------------------------------------------------
bool font_engine_freetype_base::load_font(const char* font_name,
unsigned face_index,
glyph_rendering ren_type,
const char* font_mem,
const long font_mem_size)
{
bool ret = false;
if(m_library_initialized)
{
m_last_error = 0;
int idx = find_face(font_name);
if(idx >= 0)
{
m_cur_face = m_faces[idx];
m_name = m_face_names[idx];
}
else
{
if(m_num_faces >= m_max_faces)
{
delete [] m_face_names[0];
FT_Done_Face(m_faces[0]);
memmove(m_faces,
m_faces + 1,
(m_max_faces - 1) * sizeof(FT_Face));
memmove(m_face_names,
m_face_names + 1,
(m_max_faces - 1) * sizeof(char*));
m_num_faces = m_max_faces - 1;
}
if (font_mem && font_mem_size)
{
m_last_error = FT_New_Memory_Face(m_library,
(const FT_Byte*)font_mem,
font_mem_size,
face_index,
&m_faces[m_num_faces]);
}
else
{
m_last_error = FT_New_Face(m_library,
font_name,
face_index,
&m_faces[m_num_faces]);
}
if(m_last_error == 0)
{
m_face_names[m_num_faces] = new char [strlen(font_name) + 1];
strcpy(m_face_names[m_num_faces], font_name);
m_cur_face = m_faces[m_num_faces];
m_name = m_face_names[m_num_faces];
++m_num_faces;
}
else
{
m_face_names[m_num_faces] = 0;
m_cur_face = 0;
m_name = 0;
}
if( FT_Select_Charmap(m_cur_face, FT_ENCODING_UNICODE) ) {
if( FT_Select_Charmap(m_cur_face, FT_ENCODING_MS_SYMBOL) ) {
if( FT_Select_Charmap(m_cur_face, FT_ENCODING_APPLE_ROMAN) ) {
m_char_map = FT_ENCODING_NONE;
} else {
m_char_map = FT_ENCODING_APPLE_ROMAN;
}
} else {
m_char_map = FT_ENCODING_MS_SYMBOL;
}
} else {
m_char_map = FT_ENCODING_UNICODE;
}
}
if(m_last_error == 0)
{
ret = true;
switch(ren_type)
{
case glyph_ren_native_mono:
m_glyph_rendering = glyph_ren_native_mono;
break;
case glyph_ren_native_gray8:
m_glyph_rendering = glyph_ren_native_gray8;
break;
case glyph_ren_outline:
if(FT_IS_SCALABLE(m_cur_face))
{
m_glyph_rendering = glyph_ren_outline;
}
else
{
m_glyph_rendering = glyph_ren_native_gray8;
}
break;
case glyph_ren_agg_mono:
if(FT_IS_SCALABLE(m_cur_face))
{
m_glyph_rendering = glyph_ren_agg_mono;
}
else
{
m_glyph_rendering = glyph_ren_native_mono;
}
break;
case glyph_ren_agg_gray8:
if(FT_IS_SCALABLE(m_cur_face))
{
m_glyph_rendering = glyph_ren_agg_gray8;
}
else
{
m_glyph_rendering = glyph_ren_native_gray8;
}
break;
}
update_signature();
}
}
return ret;
}
//------------------------------------------------------------------------
bool font_engine_freetype_base::attach(const char* file_name)
{
if(m_cur_face)
{
m_last_error = FT_Attach_File(m_cur_face, file_name);
return m_last_error == 0;
}
return false;
}
//------------------------------------------------------------------------
unsigned font_engine_freetype_base::num_faces() const
{
if(m_cur_face)
{
return m_cur_face->num_faces;
}
return 0;
}
//------------------------------------------------------------------------
bool font_engine_freetype_base::char_map(FT_Encoding /*char_map*/)
{
if(m_cur_face)
{
m_last_error = FT_Select_Charmap(m_cur_face, m_char_map);
if(m_last_error == 0)
{
update_signature();
return true;
}
}
return false;
}
//------------------------------------------------------------------------
bool font_engine_freetype_base::height(double h)
{
m_height = int(h * 64.0);
if(m_cur_face)
{
update_char_size();
return true;
}
return false;
}
//------------------------------------------------------------------------
bool font_engine_freetype_base::width(double w)
{
m_width = int(w * 64.0);
if(m_cur_face)
{
update_char_size();
return true;
}
return false;
}
//------------------------------------------------------------------------
void font_engine_freetype_base::hinting(bool h)
{
m_hinting = h;
if(m_cur_face)
{
update_signature();
}
}
//------------------------------------------------------------------------
void font_engine_freetype_base::flip_y(bool f)
{
m_flip_y = f;
if(m_cur_face)
{
update_signature();
}
}
//------------------------------------------------------------------------
void font_engine_freetype_base::transform(const trans_affine& affine)
{
m_affine = affine;
if(m_cur_face)
{
update_signature();
}
}
//------------------------------------------------------------------------
void font_engine_freetype_base::update_signature()
{
if(m_cur_face && m_name)
{
unsigned name_len = strlen(m_name);
if(name_len > m_name_len)
{
delete [] m_signature;
m_signature = new char [name_len + 32 + 256];
m_name_len = name_len + 32 - 1;
}
unsigned gamma_hash = 0;
if(m_glyph_rendering == glyph_ren_native_gray8 ||
m_glyph_rendering == glyph_ren_agg_mono ||
m_glyph_rendering == glyph_ren_agg_gray8)
{
unsigned char gamma_table[rasterizer_scanline_aa<>::aa_scale];
unsigned i;
for(i = 0; i < rasterizer_scanline_aa<>::aa_scale; ++i)
{
gamma_table[i] = m_rasterizer.apply_gamma(i);
}
gamma_hash = calc_crc32(gamma_table, sizeof(gamma_table));
}
sprintf(m_signature,
"%s,%u,%d,%d,%d:%dx%d,%d,%d,%08X",
m_name,
m_char_map,
m_face_index,
int(m_glyph_rendering),
m_resolution,
m_height,
m_width,
int(m_hinting),
int(m_flip_y),
gamma_hash);
if(m_glyph_rendering == glyph_ren_outline ||
m_glyph_rendering == glyph_ren_agg_mono ||
m_glyph_rendering == glyph_ren_agg_gray8)
{
double mtx[6];
char buf[100];
m_affine.store_to(mtx);
sprintf(buf, ",%08X%08X%08X%08X%08X%08X",
dbl_to_plain_fx(mtx[0]),
dbl_to_plain_fx(mtx[1]),
dbl_to_plain_fx(mtx[2]),
dbl_to_plain_fx(mtx[3]),
dbl_to_plain_fx(mtx[4]),
dbl_to_plain_fx(mtx[5]));
strcat(m_signature, buf);
}
++m_change_stamp;
}
}
//------------------------------------------------------------------------
void font_engine_freetype_base::update_char_size()
{
if(m_cur_face)
{
if(m_resolution)
{
FT_Set_Char_Size(m_cur_face,
m_width, // char_width in 1/64th of points
m_height, // char_height in 1/64th of points
m_resolution, // horizontal device resolution
m_resolution); // vertical device resolution
}
else
{
FT_Set_Pixel_Sizes(m_cur_face,
m_width >> 6, // pixel_width
m_height >> 6); // pixel_height
}
update_signature();
}
}
//------------------------------------------------------------------------
bool font_engine_freetype_base::prepare_glyph(unsigned glyph_code)
{
/* FT_ENCODING_MS_SYMBOL hack inspired from GD's gdft.c: */
/* I do not know the significance of the constant 0xf000. */
/* It was determined by inspection of the character codes */
/* stored in Microsoft font symbol.ttf */
if (m_cur_face->charmap &&
m_cur_face->charmap->encoding == FT_ENCODING_MS_SYMBOL)
glyph_code |= 0xf000;
m_glyph_index = FT_Get_Char_Index(m_cur_face, glyph_code);
m_last_error = FT_Load_Glyph(m_cur_face,
m_glyph_index,
m_hinting ? FT_LOAD_DEFAULT|FT_LOAD_NO_BITMAP : FT_LOAD_NO_HINTING|FT_LOAD_NO_BITMAP);
// m_hinting ? FT_LOAD_FORCE_AUTOHINT : FT_LOAD_NO_HINTING);
if(m_last_error == 0)
{
switch(m_glyph_rendering)
{
case glyph_ren_native_mono:
m_last_error = FT_Render_Glyph(m_cur_face->glyph, FT_RENDER_MODE_MONO);
if(m_last_error == 0)
{
decompose_ft_bitmap_mono(m_cur_face->glyph->bitmap,
m_cur_face->glyph->bitmap_left,
m_flip_y ? -m_cur_face->glyph->bitmap_top :
m_cur_face->glyph->bitmap_top,
m_flip_y,
m_scanline_bin,
m_scanlines_bin);
m_bounds.x1 = m_scanlines_bin.min_x();
m_bounds.y1 = m_scanlines_bin.min_y();
m_bounds.x2 = m_scanlines_bin.max_x() + 1;
m_bounds.y2 = m_scanlines_bin.max_y() + 1;
m_data_size = m_scanlines_bin.byte_size();
m_data_type = glyph_data_mono;
m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
return true;
}
break;
case glyph_ren_native_gray8:
m_last_error = FT_Render_Glyph(m_cur_face->glyph, FT_RENDER_MODE_NORMAL);
if(m_last_error == 0)
{
decompose_ft_bitmap_gray8(m_cur_face->glyph->bitmap,
m_cur_face->glyph->bitmap_left,
m_flip_y ? -m_cur_face->glyph->bitmap_top :
m_cur_face->glyph->bitmap_top,
m_flip_y,
m_rasterizer,
m_scanline_aa,
m_scanlines_aa);
m_bounds.x1 = m_scanlines_aa.min_x();
m_bounds.y1 = m_scanlines_aa.min_y();
m_bounds.x2 = m_scanlines_aa.max_x() + 1;
m_bounds.y2 = m_scanlines_aa.max_y() + 1;
m_data_size = m_scanlines_aa.byte_size();
m_data_type = glyph_data_gray8;
m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);
m_advance_y = int26p6_to_dbl(m_cur_face->glyph->advance.y);
return true;
}
break;
case glyph_ren_outline:
if(m_last_error == 0)
{
if(m_flag32)
{
m_path32.remove_all();
if(decompose_ft_outline(m_cur_face->glyph->outline,
m_flip_y,
m_affine,
m_path32))
{
rect_d bnd = m_path32.bounding_rect();
m_data_size = m_path32.byte_size();
m_data_type = glyph_data_outline;
m_bounds.x1 = int(floor(bnd.x1));
m_bounds.y1 = int(floor(bnd.y1));
m_bounds.x2 = int(ceil(bnd.x2));
m_bounds.y2 = int(ceil(bnd.y2));
m_advance_x = int26p6_to_dbl(m_cur_face->glyph->advance.x);