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ft2font.cpp
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811 lines (650 loc) · 22.6 KB
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/* -*- mode: c++; c-basic-offset: 4 -*- */
#define NO_IMPORT_ARRAY
#include <string>
#include <algorithm>
#include "ft2font.h"
#include "mplutils.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 "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 "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 double(v) / 64.0;
}
int FT2Font::get_path_count()
{
// get the glyph as a path, a list of (COMMAND, *args) as desribed in matplotlib.path
// this code is from agg's decompose_ft_outline with minor modifications
if (!face->glyph) {
throw "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 "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 "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 "Invalid font";
}
point += 2;
tags += 2;
if (point <= limit) {
count += 3;
continue;
}
count += 3;
goto Count_Close;
}
}
}
count++;
Count_Close:
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;
}
}
}
(*outpoints++) = 0.0;
(*outpoints++) = 0.0;
(*outcodes++) = ENDPOLY;
Close:
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 "Can not load face. Unknown file format.";
} else if (error == FT_Err_Cannot_Open_Resource) {
throw "Can not load face. Can not open resource.";
} else if (error == FT_Err_Invalid_File_Format) {
throw "Can not load face. Invalid file format.";
} else if (error) {
throw "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 "Could not set the fontsize";
}
if (open_args.stream != NULL) {
face->face_flags |= FT_FACE_FLAG_EXTERNAL_STREAM;
}
static 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()
{
angle = 0.0;
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);
static FT_Matrix transform = { 65536 / hinting_factor, 0, 0, 65536 };
FT_Set_Transform(face, &transform, 0);
if (error) {
throw "Could not set the fontsize";
}
}
void FT2Font::set_charmap(int i)
{
if (i >= face->num_charmaps) {
throw "i exceeds the available number of char maps";
}
FT_CharMap charmap = face->charmaps[i];
if (FT_Set_Charmap(face, charmap)) {
throw "Could not set the charmap";
}
}
void FT2Font::select_charmap(unsigned long i)
{
if (FT_Select_Charmap(face, (FT_Encoding)i)) {
throw "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;
glyphs.resize(0);
pen.x = 0;
pen.y = 0;
bbox.xMin = bbox.yMin = 32000;
bbox.xMax = bbox.yMax = -32000;
for (unsigned int n = 0; n < N; n++) {
std::string thischar("?");
FT_UInt glyph_index;
FT_BBox glyph_bbox;
FT_Pos last_advance;
glyph_index = FT_Get_Char_Index(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 "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 "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)
{
int error = FT_Load_Char(face, (unsigned long)charcode, flags);
if (error) {
throw "Could not load charcode";
}
FT_Glyph thisGlyph;
error = FT_Get_Glyph(face->glyph, &thisGlyph);
if (error) {
throw "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 "Could not load glyph";
}
FT_Glyph thisGlyph;
error = FT_Get_Glyph(face->glyph, &thisGlyph);
if (error) {
throw "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 "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 "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 "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 "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 "Could not get glyph names.";
}
}
}
long FT2Font::get_name_index(char *name)
{
return FT_Get_Name_Index(face, (FT_String *)name);
}