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/* -*- mode: c++; c-basic-offset: 4 -*- */
#define NO_IMPORT_ARRAY
#include <algorithm>
#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://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;
void throw_ft_error(std::string message, FT_Error error) {
std::ostringstream os("");
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 = 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;
}
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;
}
// 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 ENDPOLY is important to make patheffects work.
*(d->vertices++) = 0;
*(d->vertices++) = 0;
*(d->codes++) = ENDPOLY;
}
*(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->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->codes++) = CURVE4;
*(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 ENDPOLY 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.vertices++) = 0;
*(decomposer.codes++) = ENDPOLY;
return Py_BuildValue("NN", vertices.pyobj(), codes.pyobj());
}
FT2Font::FT2Font(FT_Open_Args &open_args, long hinting_factor_) : image(), face(NULL)
{
clear();
FT_Error 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_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);
}
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)
{
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);
}
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)
{
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 << kerning_factor);
} else {
return 0;
}
}
void FT2Font::set_kerning_factor(int factor)
{
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 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 / (hinting_factor << kerning_factor);
}
if (FT_Error error = FT_Load_Glyph(face, glyph_index, flags)) {
throw_ft_error("Could not load glyph", error);
}
// ignore errors, jump to next glyph
// extract glyph image and store it in our table
FT_Glyph thisGlyph;
if (FT_Error error = FT_Get_Glyph(face->glyph, &thisGlyph)) {
throw_ft_error("Could not get glyph", error);
}
// 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);
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);
}
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);
}
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++) {
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)
{
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);
}
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