/
_imagingft.c
1267 lines (1115 loc) · 38.9 KB
/
_imagingft.c
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/*
* PIL FreeType Driver
*
* a FreeType 2.X driver for PIL
*
* history:
* 2001-02-17 fl Created (based on old experimental freetype 1.0 code)
* 2001-04-18 fl Fixed some egcs compiler nits
* 2002-11-08 fl Added unicode support; more font metrics, etc
* 2003-05-20 fl Fixed compilation under 1.5.2 and newer non-unicode builds
* 2003-09-27 fl Added charmap encoding support
* 2004-05-15 fl Fixed compilation for FreeType 2.1.8
* 2004-09-10 fl Added support for monochrome bitmaps
* 2006-06-18 fl Fixed glyph bearing calculation
* 2007-12-23 fl Fixed crash in family/style attribute fetch
* 2008-01-02 fl Handle Unicode filenames properly
*
* Copyright (c) 1998-2007 by Secret Labs AB
*/
#define PY_SSIZE_T_CLEAN
#include "Python.h"
#include "Imaging.h"
#include <ft2build.h>
#include FT_FREETYPE_H
#include FT_GLYPH_H
#include FT_MULTIPLE_MASTERS_H
#include FT_SFNT_NAMES_H
#define KEEP_PY_UNICODE
#include "py3.h"
#if !defined(_MSC_VER)
#include <dlfcn.h>
#endif
#if !defined(FT_LOAD_TARGET_MONO)
#define FT_LOAD_TARGET_MONO FT_LOAD_MONOCHROME
#endif
/* -------------------------------------------------------------------- */
/* error table */
#undef FTERRORS_H
#undef __FTERRORS_H__
#define FT_ERRORDEF( e, v, s ) { e, s },
#define FT_ERROR_START_LIST {
#define FT_ERROR_END_LIST { 0, 0 } };
#include <raqm.h>
#define LAYOUT_FALLBACK 0
#define LAYOUT_RAQM 1
typedef struct
{
int index, x_offset, x_advance, y_offset, y_advance;
unsigned int cluster;
} GlyphInfo;
struct {
int code;
const char* message;
} ft_errors[] =
#include FT_ERRORS_H
/* -------------------------------------------------------------------- */
/* font objects */
static FT_Library library;
typedef struct {
PyObject_HEAD
FT_Face face;
unsigned char *font_bytes;
int layout_engine;
} FontObject;
static PyTypeObject Font_Type;
typedef bool (*t_raqm_version_atleast)(unsigned int major,
unsigned int minor,
unsigned int micro);
typedef raqm_t* (*t_raqm_create)(void);
typedef int (*t_raqm_set_text)(raqm_t *rq,
const uint32_t *text,
size_t len);
typedef bool (*t_raqm_set_text_utf8) (raqm_t *rq,
const char *text,
size_t len);
typedef bool (*t_raqm_set_par_direction) (raqm_t *rq,
raqm_direction_t dir);
typedef bool (*t_raqm_set_language) (raqm_t *rq,
const char *lang,
size_t start,
size_t len);
typedef bool (*t_raqm_add_font_feature) (raqm_t *rq,
const char *feature,
int len);
typedef bool (*t_raqm_set_freetype_face) (raqm_t *rq,
FT_Face face);
typedef bool (*t_raqm_layout) (raqm_t *rq);
typedef raqm_glyph_t* (*t_raqm_get_glyphs) (raqm_t *rq,
size_t *length);
typedef raqm_glyph_t_01* (*t_raqm_get_glyphs_01) (raqm_t *rq,
size_t *length);
typedef void (*t_raqm_destroy) (raqm_t *rq);
typedef struct {
void* raqm;
int version;
t_raqm_version_atleast version_atleast;
t_raqm_create create;
t_raqm_set_text set_text;
t_raqm_set_text_utf8 set_text_utf8;
t_raqm_set_par_direction set_par_direction;
t_raqm_set_language set_language;
t_raqm_add_font_feature add_font_feature;
t_raqm_set_freetype_face set_freetype_face;
t_raqm_layout layout;
t_raqm_get_glyphs get_glyphs;
t_raqm_get_glyphs_01 get_glyphs_01;
t_raqm_destroy destroy;
} p_raqm_func;
static p_raqm_func p_raqm;
/* round a 26.6 pixel coordinate to the nearest larger integer */
#define PIXEL(x) ((((x)+63) & -64)>>6)
static PyObject*
geterror(int code)
{
int i;
for (i = 0; ft_errors[i].message; i++)
if (ft_errors[i].code == code) {
PyErr_SetString(PyExc_IOError, ft_errors[i].message);
return NULL;
}
PyErr_SetString(PyExc_IOError, "unknown freetype error");
return NULL;
}
static int
setraqm(void)
{
/* set the static function pointers for dynamic raqm linking */
p_raqm.raqm = NULL;
/* Microsoft needs a totally different system */
#if !defined(_MSC_VER)
p_raqm.raqm = dlopen("libraqm.so.0", RTLD_LAZY);
if (!p_raqm.raqm) {
p_raqm.raqm = dlopen("libraqm.dylib", RTLD_LAZY);
}
#else
p_raqm.raqm = LoadLibrary("libraqm");
#endif
if (!p_raqm.raqm) {
return 1;
}
#if !defined(_MSC_VER)
p_raqm.version_atleast = (t_raqm_version_atleast)dlsym(p_raqm.raqm, "raqm_version_atleast");
p_raqm.create = (t_raqm_create)dlsym(p_raqm.raqm, "raqm_create");
p_raqm.set_text = (t_raqm_set_text)dlsym(p_raqm.raqm, "raqm_set_text");
p_raqm.set_text_utf8 = (t_raqm_set_text_utf8)dlsym(p_raqm.raqm, "raqm_set_text_utf8");
p_raqm.set_par_direction = (t_raqm_set_par_direction)dlsym(p_raqm.raqm, "raqm_set_par_direction");
p_raqm.set_language = (t_raqm_set_language)dlsym(p_raqm.raqm, "raqm_set_language");
p_raqm.add_font_feature = (t_raqm_add_font_feature)dlsym(p_raqm.raqm, "raqm_add_font_feature");
p_raqm.set_freetype_face = (t_raqm_set_freetype_face)dlsym(p_raqm.raqm, "raqm_set_freetype_face");
p_raqm.layout = (t_raqm_layout)dlsym(p_raqm.raqm, "raqm_layout");
p_raqm.destroy = (t_raqm_destroy)dlsym(p_raqm.raqm, "raqm_destroy");
if(dlsym(p_raqm.raqm, "raqm_index_to_position")) {
p_raqm.get_glyphs = (t_raqm_get_glyphs)dlsym(p_raqm.raqm, "raqm_get_glyphs");
p_raqm.version = 2;
} else {
p_raqm.version = 1;
p_raqm.get_glyphs_01 = (t_raqm_get_glyphs_01)dlsym(p_raqm.raqm, "raqm_get_glyphs");
}
if (dlerror() ||
!(p_raqm.create &&
p_raqm.set_text &&
p_raqm.set_text_utf8 &&
p_raqm.set_par_direction &&
p_raqm.set_language &&
p_raqm.add_font_feature &&
p_raqm.set_freetype_face &&
p_raqm.layout &&
(p_raqm.get_glyphs || p_raqm.get_glyphs_01) &&
p_raqm.destroy)) {
dlclose(p_raqm.raqm);
p_raqm.raqm = NULL;
return 2;
}
#else
p_raqm.version_atleast = (t_raqm_version_atleast)GetProcAddress(p_raqm.raqm, "raqm_version_atleast");
p_raqm.create = (t_raqm_create)GetProcAddress(p_raqm.raqm, "raqm_create");
p_raqm.set_text = (t_raqm_set_text)GetProcAddress(p_raqm.raqm, "raqm_set_text");
p_raqm.set_text_utf8 = (t_raqm_set_text_utf8)GetProcAddress(p_raqm.raqm, "raqm_set_text_utf8");
p_raqm.set_par_direction = (t_raqm_set_par_direction)GetProcAddress(p_raqm.raqm, "raqm_set_par_direction");
p_raqm.set_language = (t_raqm_set_language)GetProcAddress(p_raqm.raqm, "raqm_set_language");
p_raqm.add_font_feature = (t_raqm_add_font_feature)GetProcAddress(p_raqm.raqm, "raqm_add_font_feature");
p_raqm.set_freetype_face = (t_raqm_set_freetype_face)GetProcAddress(p_raqm.raqm, "raqm_set_freetype_face");
p_raqm.layout = (t_raqm_layout)GetProcAddress(p_raqm.raqm, "raqm_layout");
p_raqm.destroy = (t_raqm_destroy)GetProcAddress(p_raqm.raqm, "raqm_destroy");
if(GetProcAddress(p_raqm.raqm, "raqm_index_to_position")) {
p_raqm.get_glyphs = (t_raqm_get_glyphs)GetProcAddress(p_raqm.raqm, "raqm_get_glyphs");
p_raqm.version = 2;
} else {
p_raqm.version = 1;
p_raqm.get_glyphs_01 = (t_raqm_get_glyphs_01)GetProcAddress(p_raqm.raqm, "raqm_get_glyphs");
}
if (!(p_raqm.create &&
p_raqm.set_text &&
p_raqm.set_text_utf8 &&
p_raqm.set_par_direction &&
p_raqm.set_language &&
p_raqm.add_font_feature &&
p_raqm.set_freetype_face &&
p_raqm.layout &&
(p_raqm.get_glyphs || p_raqm.get_glyphs_01) &&
p_raqm.destroy)) {
FreeLibrary(p_raqm.raqm);
p_raqm.raqm = NULL;
return 2;
}
#endif
return 0;
}
static PyObject*
getfont(PyObject* self_, PyObject* args, PyObject* kw)
{
/* create a font object from a file name and a size (in pixels) */
FontObject* self;
int error = 0;
char* filename = NULL;
Py_ssize_t size;
Py_ssize_t index = 0;
Py_ssize_t layout_engine = 0;
unsigned char* encoding;
unsigned char* font_bytes;
Py_ssize_t font_bytes_size = 0;
static char* kwlist[] = {
"filename", "size", "index", "encoding", "font_bytes",
"layout_engine", NULL
};
if (!library) {
PyErr_SetString(
PyExc_IOError,
"failed to initialize FreeType library"
);
return NULL;
}
if (!PyArg_ParseTupleAndKeywords(args, kw, "etn|ns"PY_ARG_BYTES_LENGTH"n",
kwlist,
Py_FileSystemDefaultEncoding, &filename,
&size, &index, &encoding, &font_bytes,
&font_bytes_size, &layout_engine)) {
return NULL;
}
self = PyObject_New(FontObject, &Font_Type);
if (!self) {
if (filename)
PyMem_Free(filename);
return NULL;
}
self->face = NULL;
self->layout_engine = layout_engine;
if (filename && font_bytes_size <= 0) {
self->font_bytes = NULL;
error = FT_New_Face(library, filename, index, &self->face);
} else {
/* need to have allocated storage for font_bytes for the life of the object.*/
/* Don't free this before FT_Done_Face */
self->font_bytes = PyMem_Malloc(font_bytes_size);
if (!self->font_bytes) {
error = 65; // Out of Memory in Freetype.
}
if (!error) {
memcpy(self->font_bytes, font_bytes, (size_t)font_bytes_size);
error = FT_New_Memory_Face(library, (FT_Byte*)self->font_bytes,
font_bytes_size, index, &self->face);
}
}
if (!error)
error = FT_Set_Pixel_Sizes(self->face, 0, size);
if (!error && encoding && strlen((char*) encoding) == 4) {
FT_Encoding encoding_tag = FT_MAKE_TAG(
encoding[0], encoding[1], encoding[2], encoding[3]
);
error = FT_Select_Charmap(self->face, encoding_tag);
}
if (filename)
PyMem_Free(filename);
if (error) {
if (self->font_bytes) {
PyMem_Free(self->font_bytes);
self->font_bytes = NULL;
}
Py_DECREF(self);
return geterror(error);
}
return (PyObject*) self;
}
static int
font_getchar(PyObject* string, int index, FT_ULong* char_out)
{
#if (PY_VERSION_HEX < 0x03030000) || (defined(PYPY_VERSION_NUM))
if (PyUnicode_Check(string)) {
Py_UNICODE* p = PyUnicode_AS_UNICODE(string);
int size = PyUnicode_GET_SIZE(string);
if (index >= size)
return 0;
*char_out = p[index];
return 1;
}
#if PY_VERSION_HEX < 0x03000000
if (PyString_Check(string)) {
unsigned char* p = (unsigned char*) PyString_AS_STRING(string);
int size = PyString_GET_SIZE(string);
if (index >= size)
return 0;
*char_out = (unsigned char) p[index];
return 1;
}
#endif
#else
if (PyUnicode_Check(string)) {
if (index >= PyUnicode_GET_LENGTH(string))
return 0;
*char_out = PyUnicode_READ_CHAR(string, index);
return 1;
}
#endif
return 0;
}
static size_t
text_layout_raqm(PyObject* string, FontObject* self, const char* dir, PyObject *features,
const char* lang, GlyphInfo **glyph_info, int mask)
{
size_t i = 0, count = 0, start = 0;
raqm_t *rq;
raqm_glyph_t *glyphs = NULL;
raqm_glyph_t_01 *glyphs_01 = NULL;
raqm_direction_t direction;
rq = (*p_raqm.create)();
if (rq == NULL) {
PyErr_SetString(PyExc_ValueError, "raqm_create() failed.");
goto failed;
}
#if (PY_VERSION_HEX < 0x03030000) || (defined(PYPY_VERSION_NUM))
if (PyUnicode_Check(string)) {
Py_UNICODE *text = PyUnicode_AS_UNICODE(string);
Py_ssize_t size = PyUnicode_GET_SIZE(string);
if (! size) {
/* return 0 and clean up, no glyphs==no size,
and raqm fails with empty strings */
goto failed;
}
if (!(*p_raqm.set_text)(rq, (const uint32_t *)(text), size)) {
PyErr_SetString(PyExc_ValueError, "raqm_set_text() failed");
goto failed;
}
if (lang) {
if (!(*p_raqm.set_language)(rq, lang, start, size)) {
PyErr_SetString(PyExc_ValueError, "raqm_set_language() failed");
goto failed;
}
}
}
#if PY_VERSION_HEX < 0x03000000
else if (PyString_Check(string)) {
char *text = PyString_AS_STRING(string);
int size = PyString_GET_SIZE(string);
if (! size) {
goto failed;
}
if (!(*p_raqm.set_text_utf8)(rq, text, size)) {
PyErr_SetString(PyExc_ValueError, "raqm_set_text_utf8() failed");
goto failed;
}
if (lang) {
if (!(*p_raqm.set_language)(rq, lang, start, size)) {
PyErr_SetString(PyExc_ValueError, "raqm_set_language() failed");
goto failed;
}
}
}
#endif
#else
if (PyUnicode_Check(string)) {
Py_UCS4 *text = PyUnicode_AsUCS4Copy(string);
Py_ssize_t size = PyUnicode_GET_LENGTH(string);
if (!text || !size) {
/* return 0 and clean up, no glyphs==no size,
and raqm fails with empty strings */
goto failed;
}
int set_text = (*p_raqm.set_text)(rq, (const uint32_t *)(text), size);
PyMem_Free(text);
if (!set_text) {
PyErr_SetString(PyExc_ValueError, "raqm_set_text() failed");
goto failed;
}
if (lang) {
if (!(*p_raqm.set_language)(rq, lang, start, size)) {
PyErr_SetString(PyExc_ValueError, "raqm_set_language() failed");
goto failed;
}
}
}
#endif
else {
PyErr_SetString(PyExc_TypeError, "expected string");
goto failed;
}
direction = RAQM_DIRECTION_DEFAULT;
if (dir) {
if (strcmp(dir, "rtl") == 0)
direction = RAQM_DIRECTION_RTL;
else if (strcmp(dir, "ltr") == 0)
direction = RAQM_DIRECTION_LTR;
else if (strcmp(dir, "ttb") == 0) {
direction = RAQM_DIRECTION_TTB;
if (p_raqm.version_atleast == NULL || !(*p_raqm.version_atleast)(0, 7, 0)) {
PyErr_SetString(PyExc_ValueError, "libraqm 0.7 or greater required for 'ttb' direction");
goto failed;
}
} else {
PyErr_SetString(PyExc_ValueError, "direction must be either 'rtl', 'ltr' or 'ttb'");
goto failed;
}
}
if (!(*p_raqm.set_par_direction)(rq, direction)) {
PyErr_SetString(PyExc_ValueError, "raqm_set_par_direction() failed");
goto failed;
}
if (features != Py_None) {
int j, len;
PyObject *seq = PySequence_Fast(features, "expected a sequence");
if (!seq) {
goto failed;
}
len = PySequence_Size(seq);
for (j = 0; j < len; j++) {
PyObject *item = PySequence_Fast_GET_ITEM(seq, j);
char *feature = NULL;
Py_ssize_t size = 0;
PyObject *bytes;
#if PY_VERSION_HEX >= 0x03000000
if (!PyUnicode_Check(item)) {
#else
if (!PyUnicode_Check(item) && !PyString_Check(item)) {
#endif
PyErr_SetString(PyExc_TypeError, "expected a string");
goto failed;
}
if (PyUnicode_Check(item)) {
bytes = PyUnicode_AsUTF8String(item);
if (bytes == NULL)
goto failed;
feature = PyBytes_AS_STRING(bytes);
size = PyBytes_GET_SIZE(bytes);
}
#if PY_VERSION_HEX < 0x03000000
else {
feature = PyString_AsString(item);
size = PyString_GET_SIZE(item);
}
#endif
if (!(*p_raqm.add_font_feature)(rq, feature, size)) {
PyErr_SetString(PyExc_ValueError, "raqm_add_font_feature() failed");
goto failed;
}
}
}
if (!(*p_raqm.set_freetype_face)(rq, self->face)) {
PyErr_SetString(PyExc_RuntimeError, "raqm_set_freetype_face() failed.");
goto failed;
}
if (!(*p_raqm.layout)(rq)) {
PyErr_SetString(PyExc_RuntimeError, "raqm_layout() failed.");
goto failed;
}
if (p_raqm.version == 1) {
glyphs_01 = (*p_raqm.get_glyphs_01)(rq, &count);
if (glyphs_01 == NULL) {
PyErr_SetString(PyExc_ValueError, "raqm_get_glyphs() failed.");
count = 0;
goto failed;
}
} else { /* version == 2 */
glyphs = (*p_raqm.get_glyphs)(rq, &count);
if (glyphs == NULL) {
PyErr_SetString(PyExc_ValueError, "raqm_get_glyphs() failed.");
count = 0;
goto failed;
}
}
(*glyph_info) = PyMem_New(GlyphInfo, count);
if ((*glyph_info) == NULL) {
PyErr_SetString(PyExc_MemoryError, "PyMem_New() failed");
count = 0;
goto failed;
}
if (p_raqm.version == 1) {
for (i = 0; i < count; i++) {
(*glyph_info)[i].index = glyphs_01[i].index;
(*glyph_info)[i].x_offset = glyphs_01[i].x_offset;
(*glyph_info)[i].x_advance = glyphs_01[i].x_advance;
(*glyph_info)[i].y_offset = glyphs_01[i].y_offset;
(*glyph_info)[i].y_advance = glyphs_01[i].y_advance;
(*glyph_info)[i].cluster = glyphs_01[i].cluster;
}
} else {
for (i = 0; i < count; i++) {
(*glyph_info)[i].index = glyphs[i].index;
(*glyph_info)[i].x_offset = glyphs[i].x_offset;
(*glyph_info)[i].x_advance = glyphs[i].x_advance;
(*glyph_info)[i].y_offset = glyphs[i].y_offset;
(*glyph_info)[i].y_advance = glyphs[i].y_advance;
(*glyph_info)[i].cluster = glyphs[i].cluster;
}
}
failed:
(*p_raqm.destroy)(rq);
return count;
}
static size_t
text_layout_fallback(PyObject* string, FontObject* self, const char* dir, PyObject *features,
const char* lang, GlyphInfo **glyph_info, int mask)
{
int error, load_flags;
FT_ULong ch;
Py_ssize_t count;
FT_GlyphSlot glyph;
FT_Bool kerning = FT_HAS_KERNING(self->face);
FT_UInt last_index = 0;
int i;
if (features != Py_None || dir != NULL || lang != NULL) {
PyErr_SetString(PyExc_KeyError, "setting text direction, language or font features is not supported without libraqm");
}
#if PY_VERSION_HEX >= 0x03000000
if (!PyUnicode_Check(string)) {
#else
if (!PyUnicode_Check(string) && !PyString_Check(string)) {
#endif
PyErr_SetString(PyExc_TypeError, "expected string");
return 0;
}
count = 0;
while (font_getchar(string, count, &ch)) {
count++;
}
if (count == 0) {
return 0;
}
(*glyph_info) = PyMem_New(GlyphInfo, count);
if ((*glyph_info) == NULL) {
PyErr_SetString(PyExc_MemoryError, "PyMem_New() failed");
return 0;
}
load_flags = FT_LOAD_RENDER|FT_LOAD_NO_BITMAP;
if (mask) {
load_flags |= FT_LOAD_TARGET_MONO;
}
for (i = 0; font_getchar(string, i, &ch); i++) {
(*glyph_info)[i].index = FT_Get_Char_Index(self->face, ch);
error = FT_Load_Glyph(self->face, (*glyph_info)[i].index, load_flags);
if (error) {
geterror(error);
return 0;
}
glyph = self->face->glyph;
(*glyph_info)[i].x_offset=0;
(*glyph_info)[i].y_offset=0;
if (kerning && last_index && (*glyph_info)[i].index) {
FT_Vector delta;
if (FT_Get_Kerning(self->face, last_index, (*glyph_info)[i].index,
ft_kerning_default,&delta) == 0)
(*glyph_info)[i-1].x_advance += PIXEL(delta.x);
(*glyph_info)[i-1].y_advance += PIXEL(delta.y);
}
(*glyph_info)[i].x_advance = glyph->metrics.horiAdvance;
(*glyph_info)[i].y_advance = glyph->metrics.vertAdvance;
last_index = (*glyph_info)[i].index;
(*glyph_info)[i].cluster = ch;
}
return count;
}
static size_t
text_layout(PyObject* string, FontObject* self, const char* dir, PyObject *features,
const char* lang, GlyphInfo **glyph_info, int mask)
{
size_t count;
if (p_raqm.raqm && self->layout_engine == LAYOUT_RAQM) {
count = text_layout_raqm(string, self, dir, features, lang, glyph_info, mask);
} else {
count = text_layout_fallback(string, self, dir, features, lang, glyph_info, mask);
}
return count;
}
static PyObject*
font_getsize(FontObject* self, PyObject* args)
{
int x_position, x_max, x_min, y_max, y_min;
FT_Face face;
int xoffset, yoffset;
int horizontal_dir;
const char *dir = NULL;
const char *lang = NULL;
size_t i, count;
GlyphInfo *glyph_info = NULL;
PyObject *features = Py_None;
/* calculate size and bearing for a given string */
PyObject* string;
if (!PyArg_ParseTuple(args, "O|zOz:getsize", &string, &dir, &features, &lang))
return NULL;
count = text_layout(string, self, dir, features, lang, &glyph_info, 0);
if (PyErr_Occurred()) {
return NULL;
}
face = NULL;
xoffset = yoffset = 0;
x_position = x_max = x_min = y_max = y_min = 0;
horizontal_dir = dir && strcmp(dir, "ttb") == 0 ? 0 : 1;
for (i = 0; i < count; i++) {
int index, error, offset, x_advanced;
FT_BBox bbox;
FT_Glyph glyph;
face = self->face;
index = glyph_info[i].index;
/* Note: bitmap fonts within ttf fonts do not work, see #891/pr#960
* Yifu Yu<root@jackyyf.com>, 2014-10-15
*/
error = FT_Load_Glyph(face, index, FT_LOAD_DEFAULT|FT_LOAD_NO_BITMAP);
if (error)
return geterror(error);
if (i == 0) {
if (horizontal_dir) {
if (face->glyph->metrics.horiBearingX < 0) {
xoffset = face->glyph->metrics.horiBearingX;
x_position -= xoffset;
}
} else {
if (face->glyph->metrics.vertBearingY < 0) {
yoffset = face->glyph->metrics.vertBearingY;
y_max -= yoffset;
}
}
}
FT_Get_Glyph(face->glyph, &glyph);
FT_Glyph_Get_CBox(glyph, FT_GLYPH_BBOX_SUBPIXELS, &bbox);
if (horizontal_dir) {
x_position += glyph_info[i].x_advance;
x_advanced = x_position;
offset = glyph_info[i].x_advance -
face->glyph->metrics.width -
face->glyph->metrics.horiBearingX;
if (offset < 0)
x_advanced -= offset;
if (x_advanced > x_max)
x_max = x_advanced;
bbox.yMax += glyph_info[i].y_offset;
bbox.yMin += glyph_info[i].y_offset;
if (bbox.yMax > y_max)
y_max = bbox.yMax;
if (bbox.yMin < y_min)
y_min = bbox.yMin;
// find max distance of baseline from top
if (face->glyph->metrics.horiBearingY > yoffset)
yoffset = face->glyph->metrics.horiBearingY;
} else {
y_max -= glyph_info[i].y_advance;
if (i == count - 1) {
// trim end gap from final glyph
int offset;
offset = -glyph_info[i].y_advance -
face->glyph->metrics.height -
face->glyph->metrics.vertBearingY;
if (offset < 0)
y_max -= offset;
}
if (bbox.xMax > x_max)
x_max = bbox.xMax;
if (i == 0 || bbox.xMin < x_min)
x_min = bbox.xMin;
}
FT_Done_Glyph(glyph);
}
if (glyph_info) {
PyMem_Free(glyph_info);
glyph_info = NULL;
}
if (face) {
if (horizontal_dir) {
// left bearing
if (xoffset < 0)
x_max -= xoffset;
else
xoffset = 0;
/* difference between the font ascender and the distance of
* the baseline from the top */
yoffset = PIXEL(self->face->size->metrics.ascender - yoffset);
} else {
// top bearing
if (yoffset < 0)
y_max -= yoffset;
else
yoffset = 0;
}
}
return Py_BuildValue(
"(ii)(ii)",
PIXEL(x_max - x_min), PIXEL(y_max - y_min),
PIXEL(xoffset), yoffset
);
}
static PyObject*
font_render(FontObject* self, PyObject* args)
{
int x;
unsigned int y;
Imaging im;
int index, error, ascender, horizontal_dir;
int load_flags;
unsigned char *source;
FT_GlyphSlot glyph;
/* render string into given buffer (the buffer *must* have
the right size, or this will crash) */
PyObject* string;
Py_ssize_t id;
int mask = 0;
int temp;
int xx, x0, x1;
int yy;
unsigned int bitmap_y;
const char *dir = NULL;
const char *lang = NULL;
size_t i, count;
GlyphInfo *glyph_info;
PyObject *features = NULL;
if (!PyArg_ParseTuple(args, "On|izOz:render", &string, &id, &mask, &dir, &features, &lang)) {
return NULL;
}
glyph_info = NULL;
count = text_layout(string, self, dir, features, lang, &glyph_info, mask);
if (PyErr_Occurred()) {
return NULL;
}
if (count == 0) {
Py_RETURN_NONE;
}
im = (Imaging) id;
/* Note: bitmap fonts within ttf fonts do not work, see #891/pr#960 */
load_flags = FT_LOAD_RENDER|FT_LOAD_NO_BITMAP;
if (mask)
load_flags |= FT_LOAD_TARGET_MONO;
ascender = 0;
for (i = 0; i < count; i++) {
index = glyph_info[i].index;
error = FT_Load_Glyph(self->face, index, load_flags);
if (error)
return geterror(error);
glyph = self->face->glyph;
temp = glyph->bitmap.rows - glyph->bitmap_top;
temp -= PIXEL(glyph_info[i].y_offset);
if (temp > ascender)
ascender = temp;
}
x = y = 0;
horizontal_dir = dir && strcmp(dir, "ttb") == 0 ? 0 : 1;
for (i = 0; i < count; i++) {
index = glyph_info[i].index;
error = FT_Load_Glyph(self->face, index, load_flags);
if (error)
return geterror(error);
glyph = self->face->glyph;
if (horizontal_dir) {
if (i == 0 && self->face->glyph->metrics.horiBearingX < 0) {
x = -self->face->glyph->metrics.horiBearingX;
}
xx = PIXEL(x) + glyph->bitmap_left;
xx += PIXEL(glyph_info[i].x_offset);
} else {
if (self->face->glyph->metrics.vertBearingX < 0) {
x = -self->face->glyph->metrics.vertBearingX;
}
xx = im->xsize / 2 - glyph->bitmap.width / 2;
}
x0 = 0;
x1 = glyph->bitmap.width;
if (xx < 0)
x0 = -xx;
if (xx + x1 > im->xsize)
x1 = im->xsize - xx;
source = (unsigned char*) glyph->bitmap.buffer;
for (bitmap_y = 0; bitmap_y < glyph->bitmap.rows; bitmap_y++) {
if (horizontal_dir) {
yy = bitmap_y + im->ysize - (PIXEL(glyph->metrics.horiBearingY) + ascender);
yy -= PIXEL(glyph_info[i].y_offset);
} else {
yy = bitmap_y + PIXEL(y + glyph->metrics.vertBearingY) + ascender;
yy += PIXEL(glyph_info[i].y_offset);
}
if (yy >= 0 && yy < im->ysize) {
// blend this glyph into the buffer
unsigned char *target = im->image8[yy] + xx;
if (mask) {
// use monochrome mask (on palette images, etc)
int j, k, m = 128;
for (j = k = 0; j < x1; j++) {
if (j >= x0 && (source[k] & m))
target[j] = 255;
if (!(m >>= 1)) {
m = 128;
k++;
}
}
} else {
// use antialiased rendering
int k;
for (k = x0; k < x1; k++) {
if (target[k] < source[k])
target[k] = source[k];
}
}
}
source += glyph->bitmap.pitch;
}
x += glyph_info[i].x_advance;
y -= glyph_info[i].y_advance;
}
PyMem_Del(glyph_info);
Py_RETURN_NONE;
}
#if FREETYPE_MAJOR > 2 ||\
(FREETYPE_MAJOR == 2 && FREETYPE_MINOR > 9) ||\
(FREETYPE_MAJOR == 2 && FREETYPE_MINOR == 9 && FREETYPE_PATCH == 1)
static PyObject*
font_getvarnames(FontObject* self, PyObject* args)
{
int error;
FT_UInt i, j, num_namedstyles, name_count;
FT_MM_Var *master;
FT_SfntName name;
PyObject *list_names, *list_name;
error = FT_Get_MM_Var(self->face, &master);
if (error)
return geterror(error);
num_namedstyles = master->num_namedstyles;
list_names = PyList_New(num_namedstyles);
name_count = FT_Get_Sfnt_Name_Count(self->face);
for (i = 0; i < name_count; i++) {
error = FT_Get_Sfnt_Name(self->face, i, &name);
if (error)
return geterror(error);
for (j = 0; j < num_namedstyles; j++) {
if (PyList_GetItem(list_names, j) != NULL)
continue;
if (master->namedstyle[j].strid == name.name_id) {
list_name = Py_BuildValue(PY_ARG_BYTES_LENGTH,
name.string, name.string_len);
PyList_SetItem(list_names, j, list_name);
break;
}
}
}
FT_Done_MM_Var(library, master);
return list_names;
}
static PyObject*
font_getvaraxes(FontObject* self, PyObject* args)
{
int error;
FT_UInt i, j, num_axis, name_count;
FT_MM_Var* master;
FT_Var_Axis axis;
FT_SfntName name;
PyObject *list_axes, *list_axis, *axis_name;
error = FT_Get_MM_Var(self->face, &master);
if (error)
return geterror(error);
num_axis = master->num_axis;
name_count = FT_Get_Sfnt_Name_Count(self->face);
list_axes = PyList_New(num_axis);
for (i = 0; i < num_axis; i++) {
axis = master->axis[i];
list_axis = PyDict_New();
PyDict_SetItemString(list_axis, "minimum",
PyInt_FromLong(axis.minimum / 65536));
PyDict_SetItemString(list_axis, "default",
PyInt_FromLong(axis.def / 65536));
PyDict_SetItemString(list_axis, "maximum",
PyInt_FromLong(axis.maximum / 65536));
for (j = 0; j < name_count; j++) {
error = FT_Get_Sfnt_Name(self->face, j, &name);
if (error)
return geterror(error);
if (name.name_id == axis.strid) {
axis_name = Py_BuildValue(PY_ARG_BYTES_LENGTH,
name.string, name.string_len);
PyDict_SetItemString(list_axis, "name", axis_name);
break;
}
}
PyList_SetItem(list_axes, i, list_axis);
}
FT_Done_MM_Var(library, master);