matplotlib/src/ft2font.cpp at master · aebrahim/matplotlib · GitHub

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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;

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;

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;

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;

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;

goto Close;

}

(*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) {

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(int left, int right, int 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_UInt32 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_UInt32 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_UInt32 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);

}

matplotlib/src/ft2font.cpp at master · aebrahim/matplotlib · GitHub

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