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More work on complex glyph rendering

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Kovid Goyal
2017-10-27 10:17:00 +05:30
parent 5b0e2311e9
commit 4bea6b7ad9
1 changed files with 57 additions and 5 deletions
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62
kitty/freetype.c
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@@ -139,14 +139,19 @@ get_load_flags(int hinting, int hintstyle, int base) {
return flags;
}
static inline bool
_load_char(Face *self, char_type codepoint) {
int flags = get_load_flags(self->hinting, self->hintstyle, FT_LOAD_RENDER);
int glyph_index = FT_Get_Char_Index(self->face, codepoint);
int error = FT_Load_Glyph(self->face, glyph_index, flags);
if (error) { set_freetype_error("Failed to load glyph, with error:", error); Py_CLEAR(self); return false; }
return true;
}
static PyObject*
load_char(Face *self, PyObject *ch) {
#define load_char_doc "load_char(char)"
int char_code = (int)PyLong_AsLong(ch);
int flags = get_load_flags(self->hinting, self->hintstyle, FT_LOAD_RENDER);
int glyph_index = FT_Get_Char_Index(self->face, char_code);
int error = FT_Load_Glyph(self->face, glyph_index, flags);
if (error) { set_freetype_error("Failed to load glyph, with error:", error); Py_CLEAR(self); return NULL; }
if (!_load_char(self, (char_type)PyLong_AsUnsignedLong(ch))) return NULL;
Py_RETURN_NONE;
}
@@ -292,6 +297,52 @@ shape(Face *self, PyObject *args) {
return ans;
}
typedef struct {
char *buf;
unsigned int width, height;
FT_Glyph_Metrics metrics;
} GlyphBuffer;
static inline bool
ensure_space(GlyphBuffer *g, unsigned int width, unsigned int height) {
if (g->width >= width && g->height >= height) return true;
char *newbuf = calloc(width * height, sizeof(char));
if (newbuf == NULL) return false;
for (unsigned int r = 0; r < g->height; r++) memcpy(newbuf + r * width, g->buf + r * g->width, g->width);
free(g->buf); g->buf = newbuf; g->width = width; g->height = height;
return true;
}
static PyObject*
draw_complex_glyph(Face *self, PyObject *args) {
#define draw_complex_glyph_doc "draw_complex_glyph(text)"
const char *string;
int len;
float x = 0, y = 0;
unsigned int width = 0, height = 0;
if (!PyArg_ParseTuple(args, "s#", &string, &len)) return NULL;
ShapeData sd;
_shape(self, string, len, &sd);
GlyphBuffer g = {0};
for (unsigned i = 0; i < sd.length; i++) {
if (sd.info[i].codepoint == 0) continue;
_load_char(self, sd.info[i].codepoint);
if (i == 0) { g.metrics = self->face->glyph->metrics; }
x += (float)sd.positions[i].x_offset / 64.0;
y -= (float)sd.positions[i].y_offset / 64.0;
width = MAX(width, (unsigned int)ceilf(x + self->face->glyph->bitmap.pitch));
height = MAX(height, (unsigned int)ceilf(y + self->face->glyph->bitmap.rows));
if (!ensure_space(&g, width, height)) return PyErr_NoMemory();
}
if (!g.buf) {
PyErr_Format(PyExc_ValueError, "No glpyhs found for string: %s", string);
return NULL;
}
}
static PyObject*
trim_to_width(Face UNUSED *self, PyObject *args) {
@@ -354,6 +405,7 @@ static PyMethodDef methods[] = {
METHOD(set_char_size, METH_VARARGS)
METHOD(load_char, METH_O)
METHOD(shape, METH_VARARGS)
METHOD(draw_complex_glyph, METH_VARARGS)
METHOD(get_char_index, METH_VARARGS)
METHOD(glyph_metrics, METH_NOARGS)
METHOD(bitmap, METH_NOARGS)