matplotlib/src/ft2font.cpp at v3.7.x · matplotlib/matplotlib · GitHub

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/* -*- mode: c++; c-basic-offset: 4 -*- */

#define NO_IMPORT_ARRAY

#include <algorithm>

#include <iterator>

#include <sstream>

#include <stdexcept>

#include <string>

#include "ft2font.h"

#include "mplutils.h"

#include "numpy_cpp.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://agg.sourceforge.net/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;

// FreeType error codes; loaded as per fterror.h.

static char const* ft_error_string(FT_Error error) {

#undef __FTERRORS_H__

#define FT_ERROR_START_LIST switch (error) {

#define FT_ERRORDEF( e, v, s ) case v: return s;

#define FT_ERROR_END_LIST default: return NULL; }

#include FT_ERRORS_H

}

void throw_ft_error(std::string message, FT_Error error) {

char const* s = ft_error_string(error);

std::ostringstream os("");

if (s) {

os << message << " (" << s << "; error code 0x" << std::hex << error << ")";

} else { // Should not occur, but don't add another error from failed lookup.

os << message << " (error code 0x" << std::hex << error << ")";

}

throw std::runtime_error(os.str());

}

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 = std::min(std::max(x, 0), image_width);

FT_Int y1 = std::min(std::max(y, 0), image_height);

FT_Int x2 = std::min(std::max(x + char_width, 0), image_width);

FT_Int y2 = std::min(std::max(y + char_height, 0), image_height);

FT_Int x_start = std::max(0, -x);

FT_Int y_offset = y1 - std::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;

}

static void ft_glyph_warn(FT_ULong charcode)

{

PyObject *text_helpers = NULL, *tmp = NULL;

if (!(text_helpers = PyImport_ImportModule("matplotlib._text_helpers")) ||

!(tmp = PyObject_CallMethod(text_helpers, "warn_on_missing_glyph", "k", charcode))) {

goto exit;

}

exit:

Py_XDECREF(text_helpers);

Py_XDECREF(tmp);

if (PyErr_Occurred()) {

throw py::exception();

}

static FT_UInt

ft_get_char_index_or_warn(FT_Face face, FT_ULong charcode, bool warn = true)

{

FT_UInt glyph_index = FT_Get_Char_Index(face, charcode);

if (glyph_index) {

return glyph_index;

}

if (warn) {

ft_glyph_warn(charcode);

}

return 0;

}

// ft_outline_decomposer should be passed to FT_Outline_Decompose. On the

// first pass, vertices and codes are set to NULL, and index is simply

// incremented for each vertex that should be inserted, so that it is set, at

// the end, to the total number of vertices. On a second pass, vertices and

// codes should point to correctly sized arrays, and index set again to zero,

// to get fill vertices and codes with the outline decomposition.

struct ft_outline_decomposer

{

int index;

double* vertices;

unsigned char* codes;

};

static int

ft_outline_move_to(FT_Vector const* to, void* user)

{

ft_outline_decomposer* d = reinterpret_cast<ft_outline_decomposer*>(user);

if (d->codes) {

if (d->index) {

// Appending CLOSEPOLY is important to make patheffects work.

*(d->vertices++) = 0;

*(d->codes++) = CLOSEPOLY;

}

*(d->vertices++) = to->x / 64.;

*(d->vertices++) = to->y / 64.;

*(d->codes++) = MOVETO;

}

d->index += d->index ? 2 : 1;

return 0;

}

static int

ft_outline_line_to(FT_Vector const* to, void* user)

{

ft_outline_decomposer* d = reinterpret_cast<ft_outline_decomposer*>(user);

if (d->codes) {

*(d->vertices++) = to->x / 64.;

*(d->vertices++) = to->y / 64.;

*(d->codes++) = LINETO;

}

d->index++;

return 0;

}

static int

ft_outline_conic_to(FT_Vector const* control, FT_Vector const* to, void* user)

{

ft_outline_decomposer* d = reinterpret_cast<ft_outline_decomposer*>(user);

if (d->codes) {

*(d->vertices++) = control->x / 64.;

*(d->vertices++) = control->y / 64.;

*(d->vertices++) = to->x / 64.;

*(d->vertices++) = to->y / 64.;

*(d->codes++) = CURVE3;

}

d->index += 2;

return 0;

}

static int

ft_outline_cubic_to(

FT_Vector const* c1, FT_Vector const* c2, FT_Vector const* to, void* user)

{

ft_outline_decomposer* d = reinterpret_cast<ft_outline_decomposer*>(user);

if (d->codes) {

*(d->vertices++) = c1->x / 64.;

*(d->vertices++) = c1->y / 64.;

*(d->vertices++) = c2->x / 64.;

*(d->vertices++) = c2->y / 64.;

*(d->vertices++) = to->x / 64.;

*(d->vertices++) = to->y / 64.;

*(d->codes++) = CURVE4;

}

d->index += 3;

return 0;

}

static FT_Outline_Funcs ft_outline_funcs = {

ft_outline_move_to,

ft_outline_line_to,

ft_outline_conic_to,

ft_outline_cubic_to};

PyObject*

FT2Font::get_path()

{

if (!face->glyph) {

PyErr_SetString(PyExc_RuntimeError, "No glyph loaded");

return NULL;

}

ft_outline_decomposer decomposer = {};

if (FT_Error error =

FT_Outline_Decompose(

&face->glyph->outline, &ft_outline_funcs, &decomposer)) {

PyErr_Format(PyExc_RuntimeError,

"FT_Outline_Decompose failed with error 0x%x", error);

return NULL;

}

if (!decomposer.index) { // Don't append CLOSEPOLY to null glyphs.

npy_intp vertices_dims[2] = { 0, 2 };

numpy::array_view<double, 2> vertices(vertices_dims);

npy_intp codes_dims[1] = { 0 };

numpy::array_view<unsigned char, 1> codes(codes_dims);

return Py_BuildValue("NN", vertices.pyobj(), codes.pyobj());

}

npy_intp vertices_dims[2] = { decomposer.index + 1, 2 };

numpy::array_view<double, 2> vertices(vertices_dims);

npy_intp codes_dims[1] = { decomposer.index + 1 };

numpy::array_view<unsigned char, 1> codes(codes_dims);

decomposer.index = 0;

decomposer.vertices = vertices.data();

decomposer.codes = codes.data();

if (FT_Error error =

FT_Outline_Decompose(

&face->glyph->outline, &ft_outline_funcs, &decomposer)) {

PyErr_Format(PyExc_RuntimeError,

"FT_Outline_Decompose failed with error 0x%x", error);

return NULL;

}

*(decomposer.vertices++) = 0;

*(decomposer.codes++) = CLOSEPOLY;

return Py_BuildValue("NN", vertices.pyobj(), codes.pyobj());

}

FT2Font::FT2Font(FT_Open_Args &open_args,

long hinting_factor_,

std::vector<FT2Font *> &fallback_list)

: image(), face(NULL)

{

clear();

FT_Error error = FT_Open_Face(_ft2Library, &open_args, 0, &face);

if (error) {

throw_ft_error("Can not load face", error);

}

// set default kerning factor to 0, i.e., no kerning manipulation

kerning_factor = 0;

// 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_ft_error("Could not set the fontsize", error);

}

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);

// Set fallbacks

std::copy(fallback_list.begin(), fallback_list.end(), std::back_inserter(fallbacks));

}

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();

glyph_to_font.clear();

char_to_font.clear();

for (size_t i = 0; i < fallbacks.size(); i++) {

fallbacks[i]->clear();

}

void FT2Font::set_size(double ptsize, double dpi)

{

FT_Error error = FT_Set_Char_Size(

face, (FT_F26Dot6)(ptsize * 64), 0, (FT_UInt)(dpi * hinting_factor), (FT_UInt)dpi);

if (error) {

throw_ft_error("Could not set the fontsize", error);

}

FT_Matrix transform = { 65536 / hinting_factor, 0, 0, 65536 };

FT_Set_Transform(face, &transform, 0);

for (size_t i = 0; i < fallbacks.size(); i++) {

fallbacks[i]->set_size(ptsize, dpi);

}

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_Error error = FT_Set_Charmap(face, charmap)) {

throw_ft_error("Could not set the charmap", error);

}

void FT2Font::select_charmap(unsigned long i)

{

if (FT_Error error = FT_Select_Charmap(face, (FT_Encoding)i)) {

throw_ft_error("Could not set the charmap", error);

}

int FT2Font::get_kerning(FT_UInt left, FT_UInt right, FT_UInt mode, bool fallback = false)

{

if (fallback && glyph_to_font.find(left) != glyph_to_font.end() &&

glyph_to_font.find(right) != glyph_to_font.end()) {

FT2Font *left_ft_object = glyph_to_font[left];

FT2Font *right_ft_object = glyph_to_font[right];

if (left_ft_object != right_ft_object) {

// we do not know how to do kerning between different fonts

return 0;

}

// if left_ft_object is the same as right_ft_object,

// do the exact same thing which set_text does.

return right_ft_object->get_kerning(left, right, mode, false);

}

else

{

FT_Vector delta;

return get_kerning(left, right, mode, delta);

}

int FT2Font::get_kerning(FT_UInt left, FT_UInt right, FT_UInt mode, FT_Vector &delta)

{

if (!FT_HAS_KERNING(face)) {

return 0;

}

if (!FT_Get_Kerning(face, left, right, mode, &delta)) {

return (int)(delta.x) / (hinting_factor << kerning_factor);

} else {

return 0;

}

void FT2Font::set_kerning_factor(int factor)

{

kerning_factor = factor;

for (size_t i = 0; i < fallbacks.size(); i++) {

fallbacks[i]->set_kerning_factor(factor);

}

void FT2Font::set_text(

size_t N, uint32_t *codepoints, double angle, FT_Int32 flags, std::vector<double> &xys)

{

FT_Matrix matrix; /* transformation matrix */

angle = angle / 360.0 * 2 * M_PI;

// this computes width and height in subpixels so we have to multiply 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);

clear();

bbox.xMin = bbox.yMin = 32000;

bbox.xMax = bbox.yMax = -32000;

FT_UInt previous = 0;

FT2Font *previous_ft_object = NULL;

for (size_t n = 0; n < N; n++) {

FT_UInt glyph_index = 0;

FT_BBox glyph_bbox;

FT_Pos last_advance;

FT_Error charcode_error, glyph_error;

FT2Font *ft_object_with_glyph = this;

bool was_found = load_char_with_fallback(ft_object_with_glyph, glyph_index, glyphs,

char_to_font, glyph_to_font, codepoints[n], flags,

charcode_error, glyph_error, false);

if (!was_found) {

ft_glyph_warn((FT_ULong)codepoints[n]);

// render missing glyph tofu

// come back to top-most font

ft_object_with_glyph = this;

char_to_font[codepoints[n]] = ft_object_with_glyph;

glyph_to_font[glyph_index] = ft_object_with_glyph;

ft_object_with_glyph->load_glyph(glyph_index, flags, ft_object_with_glyph, false);

}

// retrieve kerning distance and move pen position

if ((ft_object_with_glyph == previous_ft_object) && // if both fonts are the same

ft_object_with_glyph->has_kerning() && // if the font knows how to kern

previous && glyph_index // and we really have 2 glyphs

) {

FT_Vector delta;

pen.x += ft_object_with_glyph->get_kerning(previous, glyph_index, FT_KERNING_DEFAULT, delta);

}

// extract glyph image and store it in our table

FT_Glyph &thisGlyph = glyphs[glyphs.size() - 1];

last_advance = ft_object_with_glyph->get_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;

previous_ft_object = ft_object_with_glyph;

}

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, FT2Font *&ft_object, bool fallback = false)

{

// if this is parent FT2Font, cache will be filled in 2 ways:

// 1. set_text was previously called

// 2. set_text was not called and fallback was enabled

if (fallback && char_to_font.find(charcode) != char_to_font.end()) {

ft_object = char_to_font[charcode];

// since it will be assigned to ft_object anyway

FT2Font *throwaway = NULL;

ft_object->load_char(charcode, flags, throwaway, false);

} else if (fallback) {

FT_UInt final_glyph_index;

FT_Error charcode_error, glyph_error;

FT2Font *ft_object_with_glyph = this;

bool was_found = load_char_with_fallback(ft_object_with_glyph, final_glyph_index, glyphs, char_to_font,

glyph_to_font, charcode, flags, charcode_error, glyph_error, true);

if (!was_found) {

ft_glyph_warn(charcode);

if (charcode_error) {

throw_ft_error("Could not load charcode", charcode_error);

}

else if (glyph_error) {

throw_ft_error("Could not load charcode", glyph_error);

}

ft_object = ft_object_with_glyph;

} else {

ft_object = this;

FT_UInt glyph_index = ft_get_char_index_or_warn(face, (FT_ULong)charcode);

if (FT_Error error = FT_Load_Glyph(face, glyph_index, flags)) {

throw_ft_error("Could not load charcode", error);

}

FT_Glyph thisGlyph;

if (FT_Error error = FT_Get_Glyph(face->glyph, &thisGlyph)) {

throw_ft_error("Could not get glyph", error);

}

glyphs.push_back(thisGlyph);

}

bool FT2Font::get_char_fallback_index(FT_ULong charcode, int& index) const

{

FT_UInt glyph_index = FT_Get_Char_Index(face, charcode);

if (glyph_index) {

// -1 means the host has the char and we do not need to fallback

index = -1;

return true;

} else {

int inner_index = 0;

bool was_found;

for (size_t i = 0; i < fallbacks.size(); ++i) {

// TODO handle recursion somehow!

was_found = fallbacks[i]->get_char_fallback_index(charcode, inner_index);

if (was_found) {

index = i;

return true;

}

return false;

}

bool FT2Font::load_char_with_fallback(FT2Font *&ft_object_with_glyph,

FT_UInt &final_glyph_index,

std::vector<FT_Glyph> &parent_glyphs,

std::unordered_map<long, FT2Font *> &parent_char_to_font,

std::unordered_map<FT_UInt, FT2Font *> &parent_glyph_to_font,

long charcode,

FT_Int32 flags,

FT_Error &charcode_error,

FT_Error &glyph_error,

bool override = false)

{

FT_UInt glyph_index = FT_Get_Char_Index(face, charcode);

if (glyph_index || override) {

charcode_error = FT_Load_Glyph(face, glyph_index, flags);

if (charcode_error) {

return false;

}

FT_Glyph thisGlyph;

glyph_error = FT_Get_Glyph(face->glyph, &thisGlyph);

if (glyph_error) {

return false;

}

final_glyph_index = glyph_index;

// cache the result for future

// need to store this for anytime a character is loaded from a parent

// FT2Font object or to generate a mapping of individual characters to fonts

ft_object_with_glyph = this;

parent_glyph_to_font[final_glyph_index] = this;

parent_char_to_font[charcode] = this;

parent_glyphs.push_back(thisGlyph);

return true;

}

else {

for (size_t i = 0; i < fallbacks.size(); ++i) {

bool was_found = fallbacks[i]->load_char_with_fallback(

ft_object_with_glyph, final_glyph_index, parent_glyphs, parent_char_to_font,

parent_glyph_to_font, charcode, flags, charcode_error, glyph_error, override);

if (was_found) {

return true;

}

return false;

}

void FT2Font::load_glyph(FT_UInt glyph_index,

FT_Int32 flags,

FT2Font *&ft_object,

bool fallback = false)

{

// cache is only for parent FT2Font

if (fallback && glyph_to_font.find(glyph_index) != glyph_to_font.end()) {

ft_object = glyph_to_font[glyph_index];

} else {

ft_object = this;

}

ft_object->load_glyph(glyph_index, flags);

}

void FT2Font::load_glyph(FT_UInt glyph_index, FT_Int32 flags)

{

if (FT_Error error = FT_Load_Glyph(face, glyph_index, flags)) {

throw_ft_error("Could not load glyph", error);

}

FT_Glyph thisGlyph;

if (FT_Error error = FT_Get_Glyph(face->glyph, &thisGlyph)) {

throw_ft_error("Could not get glyph", error);

}

glyphs.push_back(thisGlyph);

}

FT_UInt FT2Font::get_char_index(FT_ULong charcode, bool fallback = false)

{

FT2Font *ft_object = NULL;

if (fallback && char_to_font.find(charcode) != char_to_font.end()) {

// fallback denotes whether we want to search fallback list.

// should call set_text/load_char_with_fallback to parent FT2Font before

// wanting to use fallback list here. (since that populates the cache)

ft_object = char_to_font[charcode];

} else {

// set as self

ft_object = this;

}

// historically, get_char_index never raises a warning

return ft_get_char_index_or_warn(ft_object->get_face(), charcode, false);

}

void FT2Font::get_cbox(FT_BBox &bbox)

{

FT_Glyph_Get_CBox(glyphs.back(), ft_glyph_bbox_subpixels, &bbox);

}

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)

{

long width = (bbox.xMax - bbox.xMin) / 64 + 2;

long height = (bbox.yMax - bbox.yMin) / 64 + 2;

image.resize(width, height);

for (size_t n = 0; n < glyphs.size(); n++) {

FT_Error error = FT_Glyph_To_Bitmap(

&glyphs[n], antialiased ? FT_RENDER_MODE_NORMAL : FT_RENDER_MODE_MONO, 0, 1);

if (error) {

throw_ft_error("Could not convert glyph to bitmap", error);

}

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++) {

FT_Error error = FT_Glyph_To_Bitmap(

&glyphs[n], antialiased ? FT_RENDER_MODE_NORMAL : FT_RENDER_MODE_MONO, 0, 1);

if (error) {

throw_ft_error("Could not convert glyph to bitmap", error);

}

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");

}

FT_Error 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_ft_error("Could not convert glyph to bitmap", error);

}

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, bool fallback = false)

{

if (fallback && glyph_to_font.find(glyph_number) != glyph_to_font.end()) {

// cache is only for parent FT2Font

FT2Font *ft_object = glyph_to_font[glyph_number];

ft_object->get_glyph_name(glyph_number, buffer, false);

return;

}

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_Error error = FT_Get_Glyph_Name(face, glyph_number, buffer, 128)) {

throw_ft_error("Could not get glyph names", error);

}

long FT2Font::get_name_index(char *name)

{

return FT_Get_Name_Index(face, (FT_String *)name);

}

matplotlib/src/ft2font.cpp at v3.7.x · matplotlib/matplotlib · GitHub

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