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/*
-*- mode: c++; c-basic-offset: 4 -*-
*/
#
define
NO_IMPORT_ARRAY
#
include
<
algorithm
>
#
include
<
stdexcept
>
#
include
<
string
>
#
include
"
ft2font.h
"
#
include
"
mplutils.h
"
#
include
"
py_exceptions.h
"
#
ifndef
M_PI
#
define
M_PI
3.14159265358979323846264338328
#
endif
/*
*
To improve the hinting of the fonts, this code uses a hack
presented here:
http://antigrain.com/research/font_rasterization/index.html
The idea is to limit the effect of hinting in the x-direction, while
preserving hinting in the y-direction. Since freetype does not
support this directly, the dpi in the x-direction is set higher than
in the y-direction, which affects the hinting grid. Then, a global
transform is placed on the font to shrink it back to the desired
size. While it is a bit surprising that the dpi setting affects
hinting, whereas the global transform does not, this is documented
behavior of FreeType, and therefore hopefully unlikely to change.
The FreeType 2 tutorial says:
NOTE: The transformation is applied to every glyph that is
loaded through FT_Load_Glyph and is completely independent of
any hinting process. This means that you won't get the same
results if you load a glyph at the size of 24 pixels, or a glyph
at the size at 12 pixels scaled by 2 through a transform,
because the hints will have been computed differently (except
you have disabled hints).
*/
FT_Library _ft2Library;
FT2Image::FT2Image
() : m_dirty(
true
), m_buffer(
NULL
), m_width(
0
), m_height(
0
)
{
}
FT2Image::FT2Image
(
unsigned
long
width,
unsigned
long
height)
: m_dirty(
true
), m_buffer(
NULL
), m_width(
0
), m_height(
0
)
{
resize
(width, height);
}
FT2Image::~FT2Image
()
{
delete[]
m_buffer;
}
void
FT2Image::resize
(
long
width,
long
height)
{
if
(width <=
0
) {
width =
1
;
}
if
(height <=
0
) {
height =
1
;
}
size_t
numBytes = width * height;
if
((
unsigned
long
)width != m_width || (
unsigned
long
)height != m_height) {
if
(numBytes > m_width * m_height) {
delete[]
m_buffer;
m_buffer =
NULL
;
m_buffer =
new
unsigned
char
[numBytes];
}
m_width = (
unsigned
long
)width;
m_height = (
unsigned
long
)height;
}
if
(numBytes && m_buffer) {
memset
(m_buffer,
0
, numBytes);
}
m_dirty =
true
;
}
void
FT2Image::draw_bitmap
(FT_Bitmap *bitmap, FT_Int x, FT_Int y)
{
FT_Int image_width = (FT_Int)m_width;
FT_Int image_height = (FT_Int)m_height;
FT_Int char_width = bitmap->
width
;
FT_Int char_height = bitmap->
rows
;
FT_Int x1 =
CLAMP
(x,
0
, image_width);
FT_Int y1 =
CLAMP
(y,
0
, image_height);
FT_Int x2 =
CLAMP
(x + char_width,
0
, image_width);
FT_Int y2 =
CLAMP
(y + char_height,
0
, image_height);
FT_Int x_start =
MAX
(
0
, -x);
FT_Int y_offset = y1 -
MAX
(
0
, -y);
if
(bitmap->
pixel_mode
==
FT_PIXEL_MODE_GRAY
) {
for
(FT_Int i = y1; i < y2; ++i) {
unsigned
char
*dst = m_buffer + (i * image_width + x1);
unsigned
char
*src = bitmap->
buffer
+ (((i - y_offset) * bitmap->
pitch
) + x_start);
for
(FT_Int j = x1; j < x2; ++j, ++dst, ++src)
*dst |= *src;
}
}
else
if
(bitmap->
pixel_mode
==
FT_PIXEL_MODE_MONO
) {
for
(FT_Int i = y1; i < y2; ++i) {
unsigned
char
*dst = m_buffer + (i * image_width + x1);
unsigned
char
*src = bitmap->
buffer
+ ((i - y_offset) * bitmap->
pitch
);
for
(FT_Int j = x1; j < x2; ++j, ++dst) {
int
x = (j - x1 + x_start);
int
val = *(src + (x >>
3
)) & (
1
<< (
7
- (x &
0x7
)));
*dst = val ?
255
: *dst;
}
}
}
else
{
throw
std::runtime_error
(
"
Unknown pixel mode
"
);
}
m_dirty =
true
;
}
void
FT2Image::draw_rect
(
unsigned
long
x0,
unsigned
long
y0,
unsigned
long
x1,
unsigned
long
y1)
{
if
(x0 > m_width || x1 > m_width || y0 > m_height || y1 > m_height) {
throw
std::runtime_error
(
"
Rect coords outside image bounds
"
);
}
size_t
top = y0 * m_width;
size_t
bottom = y1 * m_width;
for
(
size_t
i = x0; i < x1 +
1
; ++i) {
m_buffer[i + top] =
255
;
m_buffer[i + bottom] =
255
;
}
for
(
size_t
j = y0 +
1
; j < y1; ++j) {
m_buffer[x0 + j * m_width] =
255
;
m_buffer[x1 + j * m_width] =
255
;
}
m_dirty =
true
;
}
void
FT2Image::draw_rect_filled
(
unsigned
long
x0,
unsigned
long
y0,
unsigned
long
x1,
unsigned
long
y1)
{
x0 =
std::min
(x0, m_width);
y0 =
std::min
(y0, m_height);
x1 =
std::min
(x1 +
1
, m_width);
y1 =
std::min
(y1 +
1
, m_height);
for
(
size_t
j = y0; j < y1; j++) {
for
(
size_t
i = x0; i < x1; i++) {
m_buffer[i + j * m_width] =
255
;
}
}
m_dirty =
true
;
}
inline
double
conv
(
long
v)
{
return
v /
64
.;
}
static
FT_UInt
ft_get_char_index_or_warn
(FT_Face face, FT_ULong charcode)
{
FT_UInt glyph_index =
FT_Get_Char_Index
(face, charcode);
if
(!glyph_index) {
PyErr_WarnFormat
(
NULL
,
1
,
"
Glyph %lu missing from current font.
"
, charcode);
//
Apparently PyErr_WarnFormat returns 0 even if the exception propagates
//
due to running with -Werror, so check the error flag directly instead.
if
(
PyErr_Occurred
()) {
throw
py::exception
();
}
}
return
glyph_index;
}
int
FT2Font::get_path_count
()
{
//
get the glyph as a path, a list of (COMMAND, *args) as described in matplotlib.path
//
this code is from agg's decompose_ft_outline with minor modifications
if
(!face->
glyph
) {
throw
std::runtime_error
(
"
No glyph loaded
"
);
}
FT_Outline &outline = face->
glyph
->
outline
;
FT_Vector v_last;
FT_Vector v_control;
FT_Vector v_start;
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
int
count;
count =
0
;
first =
0
;
for
(n =
0
; n < outline.
n_contours
; n++) {
int
last;
//
index of last point in contour
bool
starts_with_last;
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
) {
throw
std::runtime_error
(
"
A contour cannot start with a cubic control point
"
);
}
else
if
(tag ==
FT_CURVE_TAG_CONIC
) {
starts_with_last =
true
;
}
else
{
starts_with_last =
false
;
}
count++;
while
(point < limit) {
if
(!starts_with_last) {
point++;
tags++;
}
starts_with_last =
false
;
tag =
FT_CURVE_TAG
(tags[
0
]);
switch
(tag) {
case
FT_CURVE_TAG_ON
:
//
emit a single line_to
{
count++;
continue
;
}
case
FT_CURVE_TAG_CONIC
:
//
consume conic arcs
{
Count_Do_Conic:
if
(point < limit) {
point++;
tags++;
tag =
FT_CURVE_TAG
(tags[
0
]);
if
(tag ==
FT_CURVE_TAG_ON
) {
count +=
2
;
continue
;
}
if
(tag !=
FT_CURVE_TAG_CONIC
) {
throw
std::runtime_error
(
"
Invalid font
"
);
}
count +=
2
;
goto
Count_Do_Conic;
}
count +=
2
;
goto
Count_Close;
}
default
:
//
FT_CURVE_TAG_CUBIC
{
if
(point +
1
> limit ||
FT_CURVE_TAG
(tags[
1
]) !=
FT_CURVE_TAG_CUBIC
) {
throw
std::runtime_error
(
"
Invalid font
"
);
}
point +=
2
;
tags +=
2
;
if
(point <= limit) {
count +=
3
;
continue
;
}
count +=
3
;
goto
Count_Close;
}
}
}
Count_Close:
count++;
first = last +
1
;
}
return
count;
}
void
FT2Font::get_path
(
double
*outpoints,
unsigned
char
*outcodes)
{
FT_Outline &outline = face->
glyph
->
outline
;
bool
flip_y =
false
;
//
todo, pass me as kwarg
FT_Vector v_last;
FT_Vector v_control;
FT_Vector v_start;
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
bool
starts_with_last;
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
]);
double
x, y;
if
(tag !=
FT_CURVE_TAG_ON
) {
x =
conv
(v_last.
x
);
y = flip_y ? -
conv
(v_last.
y
) :
conv
(v_last.
y
);
starts_with_last =
true
;
}
else
{
x =
conv
(v_start.
x
);
y = flip_y ? -
conv
(v_start.
y
) :
conv
(v_start.
y
);
starts_with_last =
false
;
}
*(outpoints++) = x;
*(outpoints++) = y;
*(outcodes++) =
MOVETO
;
while
(point < limit) {
if
(!starts_with_last) {
point++;
tags++;
}
starts_with_last =
false
;
tag =
FT_CURVE_TAG
(tags[
0
]);
switch
(tag) {
case
FT_CURVE_TAG_ON
:
//
emit a single line_to
{
double
x =
conv
(point->
x
);
double
y = flip_y ? -
conv
(point->
y
) :
conv
(point->
y
);
*(outpoints++) = x;
*(outpoints++) = y;
*(outcodes++) =
LINETO
;
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
) {
double
xctl =
conv
(v_control.
x
);
double
yctl = flip_y ? -
conv
(v_control.
y
) :
conv
(v_control.
y
);
double
xto =
conv
(vec.
x
);
double
yto = flip_y ? -
conv
(vec.
y
) :
conv
(vec.
y
);
*(outpoints++) = xctl;
*(outpoints++) = yctl;
*(outpoints++) = xto;
*(outpoints++) = yto;
*(outcodes++) =
CURVE3
;
*(outcodes++) =
CURVE3
;
continue
;
}
v_middle.
x
= (v_control.
x
+ vec.
x
) /
2
;
v_middle.
y
= (v_control.
y
+ vec.
y
) /
2
;
double
xctl =
conv
(v_control.
x
);
double
yctl = flip_y ? -
conv
(v_control.
y
) :
conv
(v_control.
y
);
double
xto =
conv
(v_middle.
x
);
double
yto = flip_y ? -
conv
(v_middle.
y
) :
conv
(v_middle.
y
);
*(outpoints++) = xctl;
*(outpoints++) = yctl;
*(outpoints++) = xto;
*(outpoints++) = yto;
*(outcodes++) =
CURVE3
;
*(outcodes++) =
CURVE3
;
v_control = vec;
goto
Do_Conic;
}
double
xctl =
conv
(v_control.
x
);
double
yctl = flip_y ? -
conv
(v_control.
y
) :
conv
(v_control.
y
);
double
xto =
conv
(v_start.
x
);
double
yto = flip_y ? -
conv
(v_start.
y
) :
conv
(v_start.
y
);
*(outpoints++) = xctl;
*(outpoints++) = yctl;
*(outpoints++) = xto;
*(outpoints++) = yto;
*(outcodes++) =
CURVE3
;
*(outcodes++) =
CURVE3
;
goto
Close;
}
default
:
//
FT_CURVE_TAG_CUBIC
{
FT_Vector vec1, vec2;
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
;
double
xctl1 =
conv
(vec1.
x
);
double
yctl1 = flip_y ? -
conv
(vec1.
y
) :
conv
(vec1.
y
);
double
xctl2 =
conv
(vec2.
x
);
double
yctl2 = flip_y ? -
conv
(vec2.
y
) :
conv
(vec2.
y
);
double
xto =
conv
(vec.
x
);
double
yto = flip_y ? -
conv
(vec.
y
) :
conv
(vec.
y
);
(*outpoints++) = xctl1;
(*outpoints++) = yctl1;
(*outpoints++) = xctl2;
(*outpoints++) = yctl2;
(*outpoints++) = xto;
(*outpoints++) = yto;
(*outcodes++) =
CURVE4
;
(*outcodes++) =
CURVE4
;
(*outcodes++) =
CURVE4
;
continue
;
}
double
xctl1 =
conv
(vec1.
x
);
double
yctl1 = flip_y ? -
conv
(vec1.
y
) :
conv
(vec1.
y
);
double
xctl2 =
conv
(vec2.
x
);
double
yctl2 = flip_y ? -
conv
(vec2.
y
) :
conv
(vec2.
y
);
double
xto =
conv
(v_start.
x
);
double
yto = flip_y ? -
conv
(v_start.
y
) :
conv
(v_start.
y
);
(*outpoints++) = xctl1;
(*outpoints++) = yctl1;
(*outpoints++) = xctl2;
(*outpoints++) = yctl2;
(*outpoints++) = xto;
(*outpoints++) = yto;
(*outcodes++) =
CURVE4
;
(*outcodes++) =
CURVE4
;
(*outcodes++) =
CURVE4
;
goto
Close;
}
}
}
Close:
(*outpoints++) =
0.0
;
(*outpoints++) =
0.0
;
(*outcodes++) =
ENDPOLY
;
first = last +
1
;
}
}
FT2Font::FT2Font
(FT_Open_Args &open_args,
long
hinting_factor_) : image(), face(
NULL
)
{
clear
();
int
error =
FT_Open_Face
(_ft2Library, &open_args,
0
, &face);
if
(error == FT_Err_Unknown_File_Format) {
throw
std::runtime_error
(
"
Can not load face. Unknown file format.
"
);
}
else
if
(error == FT_Err_Cannot_Open_Resource) {
throw
std::runtime_error
(
"
Can not load face. Can not open resource.
"
);
}
else
if
(error == FT_Err_Invalid_File_Format) {
throw
std::runtime_error
(
"
Can not load face. Invalid file format.
"
);
}
else
if
(error) {
throw
std::runtime_error
(
"
Can not load face.
"
);
}
//
set a default fontsize 12 pt at 72dpi
hinting_factor = hinting_factor_;
error =
FT_Set_Char_Size
(face,
12
*
64
,
0
,
72
* (
unsigned
int
)hinting_factor,
72
);
if
(error) {
FT_Done_Face
(face);
throw
std::runtime_error
(
"
Could not set the fontsize
"
);
}
if
(open_args.
stream
!=
NULL
) {
face->
face_flags
|=
FT_FACE_FLAG_EXTERNAL_STREAM
;
}
FT_Matrix transform = {
65536
/ hinting_factor,
0
,
0
,
65536
};
FT_Set_Transform
(face, &transform,
0
);
}
FT2Font::~FT2Font
()
{
for
(
size_t
i =
0
; i < glyphs.
size
(); i++) {
FT_Done_Glyph
(glyphs[i]);
}
if
(face) {
FT_Done_Face
(face);
}
}
void
FT2Font::clear
()
{
pen.
x
=
0
;
pen.
y
=
0
;
for
(
size_t
i =
0
; i < glyphs.
size
(); i++) {
FT_Done_Glyph
(glyphs[i]);
}
glyphs.
clear
();
}
void
FT2Font::set_size
(
double
ptsize,
double
dpi)
{
int
error =
FT_Set_Char_Size
(
face, (
long
)(ptsize *
64
),
0
, (
unsigned
int
)(dpi * hinting_factor), (
unsigned
int
)dpi);
FT_Matrix transform = {
65536
/ hinting_factor,
0
,
0
,
65536
};
FT_Set_Transform
(face, &transform,
0
);
if
(error) {
throw
std::runtime_error
(
"
Could not set the fontsize
"
);
}
}
void
FT2Font::set_charmap
(
int
i)
{
if
(i >= face->
num_charmaps
) {
throw
std::runtime_error
(
"
i exceeds the available number of char maps
"
);
}
FT_CharMap charmap = face->
charmaps
[i];
if
(
FT_Set_Charmap
(face, charmap)) {
throw
std::runtime_error
(
"
Could not set the charmap
"
);
}
}
void
FT2Font::select_charmap
(
unsigned
long
i)
{
if
(
FT_Select_Charmap
(face, (FT_Encoding)i)) {
throw
std::runtime_error
(
"
Could not set the charmap
"
);
}
}
int
FT2Font::get_kerning
(FT_UInt left, FT_UInt right, FT_UInt mode)
{
if
(!
FT_HAS_KERNING
(face)) {
return
0
;
}
FT_Vector delta;
if
(!
FT_Get_Kerning
(face, left, right, mode, &delta)) {
return
(
int
)(delta.
x
) / (hinting_factor <<
6
);
}
else
{
return
0
;
}
}
void
FT2Font::set_text
(
size_t
N,
uint32_t
*codepoints,
double
angle, FT_Int32 flags, std::vector<
double
> &xys)
{
angle = angle /
360.0
*
2
*
M_PI
;
//
this computes width and height in subpixels so we have to divide by 64
matrix.
xx
= (FT_Fixed)(
cos
(angle) *
0x10000L
);
matrix.
xy
= (FT_Fixed)(-
sin
(angle) *
0x10000L
);
matrix.
yx
= (FT_Fixed)(
sin
(angle) *
0x10000L
);
matrix.
yy
= (FT_Fixed)(
cos
(angle) *
0x10000L
);
FT_Bool use_kerning =
FT_HAS_KERNING
(face);
FT_UInt previous =
0
;
clear
();
bbox.
xMin
= bbox.
yMin
=
32000
;
bbox.
xMax
= bbox.
yMax
= -
32000
;
for
(
unsigned
int
n =
0
; n < N; n++) {
FT_UInt glyph_index;
FT_BBox glyph_bbox;
FT_Pos last_advance;
glyph_index =
ft_get_char_index_or_warn
(face, codepoints[n]);
//
retrieve kerning distance and move pen position
if
(use_kerning && previous && glyph_index) {
FT_Vector delta;
FT_Get_Kerning
(face, previous, glyph_index,
FT_KERNING_DEFAULT
, &delta);
pen.
x
+= (delta.
x
<<
10
) / (hinting_factor <<
16
);
}
error =
FT_Load_Glyph
(face, glyph_index, flags);
if
(error) {
throw
std::runtime_error
(
"
could not load glyph
"
);
}
//
ignore errors, jump to next glyph
//
extract glyph image and store it in our table
FT_Glyph thisGlyph;
error =
FT_Get_Glyph
(face->
glyph
, &thisGlyph);
if
(error) {
throw
std::runtime_error
(
"
could not get glyph
"
);
}
//
ignore errors, jump to next glyph
last_advance = face->
glyph
->
advance
.
x
;
FT_Glyph_Transform
(thisGlyph,
0
, &pen);
FT_Glyph_Transform
(thisGlyph, &matrix,
0
);
xys.
push_back
(pen.
x
);
xys.
push_back
(pen.
y
);
FT_Glyph_Get_CBox
(thisGlyph, ft_glyph_bbox_subpixels, &glyph_bbox);
bbox.
xMin
=
std::min
(bbox.
xMin
, glyph_bbox.
xMin
);
bbox.
xMax
=
std::max
(bbox.
xMax
, glyph_bbox.
xMax
);
bbox.
yMin
=
std::min
(bbox.
yMin
, glyph_bbox.
yMin
);
bbox.
yMax
=
std::max
(bbox.
yMax
, glyph_bbox.
yMax
);
pen.
x
+= last_advance;
previous = glyph_index;
glyphs.
push_back
(thisGlyph);
}
FT_Vector_Transform
(&pen, &matrix);
advance = pen.
x
;
if
(bbox.
xMin
> bbox.
xMax
) {
bbox.
xMin
= bbox.
yMin
= bbox.
xMax
= bbox.
yMax
=
0
;
}
}
void
FT2Font::load_char
(
long
charcode, FT_Int32 flags)
{
FT_UInt glyph_index =
ft_get_char_index_or_warn
(face, (FT_ULong)charcode);
int
error =
FT_Load_Glyph
(face, glyph_index, flags);
if
(error) {
throw
std::runtime_error
(
"
Could not load charcode
"
);
}
FT_Glyph thisGlyph;
error =
FT_Get_Glyph
(face->
glyph
, &thisGlyph);
if
(error) {
throw
std::runtime_error
(
"
Could not get glyph
"
);
}
glyphs.
push_back
(thisGlyph);
}
void
FT2Font::load_glyph
(FT_UInt glyph_index, FT_Int32 flags)
{
int
error =
FT_Load_Glyph
(face, glyph_index, flags);
if
(error) {
throw
std::runtime_error
(
"
Could not load glyph
"
);
}
FT_Glyph thisGlyph;
error =
FT_Get_Glyph
(face->
glyph
, &thisGlyph);
if
(error) {
throw
std::runtime_error
(
"
Could not load glyph
"
);
}
glyphs.
push_back
(thisGlyph);
}
void
FT2Font::get_width_height
(
long
*width,
long
*height)
{
*width = advance;
*height = bbox.
yMax
- bbox.
yMin
;
}
long
FT2Font::get_descent
()
{
return
-bbox.
yMin
;
}
void
FT2Font::get_bitmap_offset
(
long
*x,
long
*y)
{
*x = bbox.
xMin
;
*y =
0
;
}
void
FT2Font::draw_glyphs_to_bitmap
(
bool
antialiased)
{
size_t
width = (bbox.
xMax
- bbox.
xMin
) /
64
+
2
;
size_t
height = (bbox.
yMax
- bbox.
yMin
) /
64
+
2
;
image.
resize
(width, height);
for
(
size_t
n =
0
; n < glyphs.
size
(); n++) {
error =
FT_Glyph_To_Bitmap
(
&glyphs[n], antialiased ?
FT_RENDER_MODE_NORMAL
:
FT_RENDER_MODE_MONO
,
0
,
1
);
if
(error) {
throw
std::runtime_error
(
"
Could not convert glyph to bitmap
"
);
}
FT_BitmapGlyph bitmap = (FT_BitmapGlyph)glyphs[n];
//
now, draw to our target surface (convert position)
//
bitmap left and top in pixel, string bbox in subpixel
FT_Int x = (FT_Int)(bitmap->
left
- (bbox.
xMin
/
64
.));
FT_Int y = (FT_Int)((bbox.
yMax
/
64
.) - bitmap->
top
+
1
);
image.
draw_bitmap
(&bitmap->
bitmap
, x, y);
}
}
void
FT2Font::get_xys
(
bool
antialiased, std::vector<
double
> &xys)
{
for
(
size_t
n =
0
; n < glyphs.
size
(); n++) {
error =
FT_Glyph_To_Bitmap
(
&glyphs[n], antialiased ?
FT_RENDER_MODE_NORMAL
:
FT_RENDER_MODE_MONO
,
0
,
1
);
if
(error) {
throw
std::runtime_error
(
"
Could not convert glyph to bitmap
"
);
}
FT_BitmapGlyph bitmap = (FT_BitmapGlyph)glyphs[n];
//
bitmap left and top in pixel, string bbox in subpixel
FT_Int x = (FT_Int)(bitmap->
left
- bbox.
xMin
/
64
.);
FT_Int y = (FT_Int)(bbox.
yMax
/
64
. - bitmap->
top
+
1
);
//
make sure the index is non-neg
x = x <
0
?
0
: x;
y = y <
0
?
0
: y;
xys.
push_back
(x);
xys.
push_back
(y);
}
}
void
FT2Font::draw_glyph_to_bitmap
(FT2Image &im,
int
x,
int
y,
size_t
glyphInd,
bool
antialiased)
{
FT_Vector sub_offset;
sub_offset.
x
=
0
;
//
int((xd - (double)x) * 64.0);
sub_offset.
y
=
0
;
//
int((yd - (double)y) * 64.0);
if
(glyphInd >= glyphs.
size
()) {
throw
std::runtime_error
(
"
glyph num is out of range
"
);
}
error =
FT_Glyph_To_Bitmap
(&glyphs[glyphInd],
antialiased ?
FT_RENDER_MODE_NORMAL
:
FT_RENDER_MODE_MONO
,
&sub_offset,
//
additional translation
1
//
destroy image
);
if
(error) {
throw
std::runtime_error
(
"
Could not convert glyph to bitmap
"
);
}
FT_BitmapGlyph bitmap = (FT_BitmapGlyph)glyphs[glyphInd];
im.
draw_bitmap
(&bitmap->
bitmap
, x + bitmap->
left
, y);
}
void
FT2Font::get_glyph_name
(
unsigned
int
glyph_number,
char
*buffer)
{
if
(!
FT_HAS_GLYPH_NAMES
(face)) {
/*
Note that this generated name must match the name that
is generated by ttconv in ttfont_CharStrings_getname.
*/
PyOS_snprintf
(buffer,
128
,
"
uni%08x
"
, glyph_number);
}
else
{
if
(
FT_Get_Glyph_Name
(face, glyph_number, buffer,
128
)) {
throw
std::runtime_error
(
"
Could not get glyph names.
"
);
}
}
}
long
FT2Font::get_name_index
(
char
*name)
{
return
FT_Get_Name_Index
(face, (FT_String *)name);
}
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