#include "hb-font-private.hh"
+#include FT_ADVANCES_H
#include FT_TRUETYPE_TABLES_H
-HB_BEGIN_DECLS
+
+
+#ifndef HB_DEBUG_FT
+#define HB_DEBUG_FT (HB_DEBUG+0)
+#endif
+
+
+/* TODO:
+ *
+ * In general, this file does a fine job of what it's supposed to do.
+ * There are, however, things that need more work:
+ *
+ * - We don't handle any load_flags. That definitely has API implications. :(
+ * I believe hb_ft_font_create() should take load_flags input.
+ * In particular, FT_Get_Advance() without the NO_HINTING flag seems to be
+ * buggy.
+ *
+ * - We don't handle / allow for emboldening / obliqueing.
+ *
+ * - Rounding, etc?
+ *
+ * - In the future, we should add constructors to create fonts in font space.
+ *
+ * - I believe transforms are not correctly implemented. FreeType does not
+ * provide any API to get to the transform/delta set on the face. :(
+ *
+ * - Always use FT_LOAD_IGNORE_GLOBAL_ADVANCE_WIDTH?
+ *
+ * - FT_Load_Glyph() is exteremely costly. Do something about it?
+ */
static hb_bool_t
-hb_ft_get_contour_point (hb_font_t *font HB_UNUSED,
- void *font_data,
- hb_codepoint_t glyph,
- unsigned int point_index,
- hb_position_t *x,
- hb_position_t *y,
- void *user_data HB_UNUSED)
+hb_ft_get_glyph (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t unicode,
+ hb_codepoint_t variation_selector,
+ hb_codepoint_t *glyph,
+ void *user_data HB_UNUSED)
+
{
FT_Face ft_face = (FT_Face) font_data;
- int load_flags = FT_LOAD_DEFAULT;
- /* TODO: load_flags, embolden, etc */
+#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX
+ if (unlikely (variation_selector)) {
+ *glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector);
+ if (*glyph)
+ return true;
+ }
+#endif
- if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
- return FALSE;
+ *glyph = FT_Get_Char_Index (ft_face, unicode);
+ return *glyph != 0;
+}
- if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
- return FALSE;
+static hb_position_t
+hb_ft_get_glyph_h_advance (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ void *user_data HB_UNUSED)
+{
+ FT_Face ft_face = (FT_Face) font_data;
+ int load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING;
+ FT_Fixed v;
- if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
- return FALSE;
+ if (unlikely (FT_Get_Advance (ft_face, glyph, load_flags, &v)))
+ return 0;
- *x = ft_face->glyph->outline.points[point_index].x;
- *y = ft_face->glyph->outline.points[point_index].y;
+ return v >> 10;
+}
+
+static hb_position_t
+hb_ft_get_glyph_v_advance (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ void *user_data HB_UNUSED)
+{
+ FT_Face ft_face = (FT_Face) font_data;
+ int load_flags = FT_LOAD_DEFAULT | FT_LOAD_NO_HINTING | FT_LOAD_VERTICAL_LAYOUT;
+ FT_Fixed v;
+
+ if (unlikely (FT_Get_Advance (ft_face, glyph, load_flags, &v)))
+ return 0;
- return TRUE;
+ /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
+ * have a Y growing upward. Hence the extra negation. */
+ return -v >> 10;
}
-static void
-hb_ft_get_glyph_advance (hb_font_t *font HB_UNUSED,
- void *font_data,
- hb_codepoint_t glyph,
- hb_position_t *x_advance,
- hb_position_t *y_advance,
- void *user_data HB_UNUSED)
+static hb_bool_t
+hb_ft_get_glyph_h_origin (hb_font_t *font HB_UNUSED,
+ void *font_data HB_UNUSED,
+ hb_codepoint_t glyph HB_UNUSED,
+ hb_position_t *x HB_UNUSED,
+ hb_position_t *y HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ /* We always work in the horizontal coordinates. */
+ return true;
+}
+
+static hb_bool_t
+hb_ft_get_glyph_v_origin (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ hb_position_t *x,
+ hb_position_t *y,
+ void *user_data HB_UNUSED)
{
FT_Face ft_face = (FT_Face) font_data;
int load_flags = FT_LOAD_DEFAULT;
- /* TODO: load_flags, embolden, etc */
+ if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
+ return false;
- if (likely (!FT_Load_Glyph (ft_face, glyph, load_flags)))
- {
- *x_advance = ft_face->glyph->advance.x;
- *y_advance = ft_face->glyph->advance.y;
- }
+ /* Note: FreeType's vertical metrics grows downward while other FreeType coordinates
+ * have a Y growing upward. Hence the extra negation. */
+ *x = ft_face->glyph->metrics.horiBearingX - ft_face->glyph->metrics.vertBearingX;
+ *y = ft_face->glyph->metrics.horiBearingY - (-ft_face->glyph->metrics.vertBearingY);
+
+ return true;
}
-static void
+static hb_position_t
+hb_ft_get_glyph_h_kerning (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t left_glyph,
+ hb_codepoint_t right_glyph,
+ void *user_data HB_UNUSED)
+{
+ FT_Face ft_face = (FT_Face) font_data;
+ FT_Vector kerningv;
+
+ if (FT_Get_Kerning (ft_face, left_glyph, right_glyph, FT_KERNING_DEFAULT, &kerningv))
+ return 0;
+
+ return kerningv.x;
+}
+
+static hb_position_t
+hb_ft_get_glyph_v_kerning (hb_font_t *font HB_UNUSED,
+ void *font_data HB_UNUSED,
+ hb_codepoint_t top_glyph HB_UNUSED,
+ hb_codepoint_t bottom_glyph HB_UNUSED,
+ void *user_data HB_UNUSED)
+{
+ /* FreeType API doesn't support vertical kerning */
+ return 0;
+}
+
+static hb_bool_t
hb_ft_get_glyph_extents (hb_font_t *font HB_UNUSED,
void *font_data,
hb_codepoint_t glyph,
FT_Face ft_face = (FT_Face) font_data;
int load_flags = FT_LOAD_DEFAULT;
- /* TODO: load_flags, embolden, etc */
+ if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
+ return false;
- if (likely (!FT_Load_Glyph (ft_face, glyph, load_flags)))
- {
- /* XXX: A few negations should be in order here, not sure. */
- extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
- extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
- extents->width = ft_face->glyph->metrics.width;
- extents->height = ft_face->glyph->metrics.height;
- }
+ extents->x_bearing = ft_face->glyph->metrics.horiBearingX;
+ extents->y_bearing = ft_face->glyph->metrics.horiBearingY;
+ extents->width = ft_face->glyph->metrics.width;
+ extents->height = ft_face->glyph->metrics.height;
+ return true;
}
-static hb_codepoint_t
-hb_ft_get_glyph (hb_font_t *font HB_UNUSED,
- void *font_data,
- hb_codepoint_t unicode,
- hb_codepoint_t variation_selector,
- void *user_data HB_UNUSED)
-
+static hb_bool_t
+hb_ft_get_glyph_contour_point (hb_font_t *font HB_UNUSED,
+ void *font_data,
+ hb_codepoint_t glyph,
+ unsigned int point_index,
+ hb_position_t *x,
+ hb_position_t *y,
+ void *user_data HB_UNUSED)
{
FT_Face ft_face = (FT_Face) font_data;
+ int load_flags = FT_LOAD_DEFAULT;
-#ifdef HAVE_FT_FACE_GETCHARVARIANTINDEX
- if (unlikely (variation_selector)) {
- hb_codepoint_t glyph = FT_Face_GetCharVariantIndex (ft_face, unicode, variation_selector);
- if (glyph)
- return glyph;
- }
-#endif
+ if (unlikely (FT_Load_Glyph (ft_face, glyph, load_flags)))
+ return false;
+
+ if (unlikely (ft_face->glyph->format != FT_GLYPH_FORMAT_OUTLINE))
+ return false;
+
+ if (unlikely (point_index >= (unsigned int) ft_face->glyph->outline.n_points))
+ return false;
- return FT_Get_Char_Index (ft_face, unicode);
+ *x = ft_face->glyph->outline.points[point_index].x;
+ *y = ft_face->glyph->outline.points[point_index].y;
+
+ return true;
}
-static void
-hb_ft_get_kerning (hb_font_t *font HB_UNUSED,
- void *font_data,
- hb_codepoint_t first_glyph,
- hb_codepoint_t second_glyph,
- hb_position_t *x_kern,
- hb_position_t *y_kern,
- void *user_data HB_UNUSED)
+static hb_bool_t
+hb_ft_get_glyph_name (hb_font_t *font,
+ void *font_data,
+ hb_codepoint_t glyph,
+ char *name, unsigned int size,
+ void *user_data HB_UNUSED)
{
FT_Face ft_face = (FT_Face) font_data;
- FT_Vector kerning;
- /* TODO: Kern type? */
- if (FT_Get_Kerning (ft_face, first_glyph, second_glyph, FT_KERNING_DEFAULT, &kerning))
- return;
+ hb_bool_t ret = !FT_Get_Glyph_Name (ft_face, glyph, name, size);
+ if (!ret)
+ snprintf (name, size, "gid%u", glyph);
- *x_kern = kerning.x;
- *y_kern = kerning.y;
+ return ret;
}
-static hb_font_funcs_t ft_ffuncs = {
- HB_OBJECT_HEADER_STATIC,
-
- TRUE, /* immutable */
+static hb_bool_t
+hb_ft_get_glyph_from_name (hb_font_t *font,
+ void *font_data,
+ const char *name, int len, /* -1 means nul-terminated */
+ hb_codepoint_t *glyph,
+ void *user_data HB_UNUSED)
+{
+ FT_Face ft_face = (FT_Face) font_data;
- {
- hb_ft_get_contour_point,
- hb_ft_get_glyph_advance,
- hb_ft_get_glyph_extents,
- hb_ft_get_glyph,
- hb_ft_get_kerning
+ if (len < 0)
+ *glyph = FT_Get_Name_Index (ft_face, (FT_String *) name);
+ else {
+ /* Make a nul-terminated version. */
+ char buf[128];
+ len = MIN (len, (int) sizeof (buf) - 1);
+ strncpy (buf, name, len);
+ buf[len] = '\0';
+ *glyph = FT_Get_Name_Index (ft_face, buf);
}
-};
-hb_font_funcs_t *
-hb_ft_get_font_funcs (void)
+ return *glyph != 0;
+}
+
+
+static hb_font_funcs_t *
+_hb_ft_get_font_funcs (void)
{
- return &ft_ffuncs;
+ static const hb_font_funcs_t ft_ffuncs = {
+ HB_OBJECT_HEADER_STATIC,
+
+ true, /* immutable */
+
+ {
+#define HB_FONT_FUNC_IMPLEMENT(name) hb_ft_get_##name,
+ HB_FONT_FUNCS_IMPLEMENT_CALLBACKS
+#undef HB_FONT_FUNC_IMPLEMENT
+ }
+ };
+
+ return const_cast<hb_font_funcs_t *> (&ft_ffuncs);
}
static hb_blob_t *
-get_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
+reference_table (hb_face_t *face HB_UNUSED, hb_tag_t tag, void *user_data)
{
FT_Face ft_face = (FT_Face) user_data;
FT_Byte *buffer;
FT_ULong length = 0;
FT_Error error;
- if (unlikely (tag == HB_TAG_NONE))
- return NULL;
+ /* Note: FreeType like HarfBuzz uses the NONE tag for fetching the entire blob */
error = FT_Load_Sfnt_Table (ft_face, tag, 0, NULL, &length);
if (error)
blob = hb_blob_create ((const char *) ft_face->stream->base,
(unsigned int) ft_face->stream->size,
- /* TODO: Check FT_FACE_FLAG_EXTERNAL_STREAM? */
+ /* TODO: We assume that it's mmap()'ed, but FreeType code
+ * suggests that there are cases we reach here but font is
+ * not mmapped. For example, when mmap() fails. No idea
+ * how to deal with it better here. */
HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
ft_face, destroy);
face = hb_face_create (blob, ft_face->face_index);
hb_blob_destroy (blob);
} else {
- face = hb_face_create_for_tables (get_table, ft_face, destroy);
+ face = hb_face_create_for_tables (reference_table, ft_face, destroy);
}
+ hb_face_set_index (face, ft_face->face_index);
+ hb_face_set_upem (face, ft_face->units_per_EM);
+
return face;
}
return hb_face_reference ((hb_face_t *) ft_face->generic.data);
}
+static void
+_do_nothing (void)
+{
+}
+
hb_font_t *
hb_ft_font_create (FT_Face ft_face,
font = hb_font_create (face);
hb_face_destroy (face);
hb_font_set_funcs (font,
- hb_ft_get_font_funcs (),
- ft_face, NULL);
+ _hb_ft_get_font_funcs (),
+ ft_face, (hb_destroy_func_t) _do_nothing);
hb_font_set_scale (font,
((uint64_t) ft_face->size->metrics.x_scale * (uint64_t) ft_face->units_per_EM) >> 16,
((uint64_t) ft_face->size->metrics.y_scale * (uint64_t) ft_face->units_per_EM) >> 16);
}
-HB_END_DECLS
+/* Thread-safe, lock-free, FT_Library */
+
+static FT_Library ft_library;
+
+static
+void free_ft_library (void)
+{
+ FT_Done_FreeType (ft_library);
+}
+
+static FT_Library
+get_ft_library (void)
+{
+retry:
+ FT_Library library = (FT_Library) hb_atomic_ptr_get (&ft_library);
+
+ if (unlikely (!library))
+ {
+ /* Not found; allocate one. */
+ if (FT_Init_FreeType (&library))
+ return NULL;
+
+ if (!hb_atomic_ptr_cmpexch (&ft_library, NULL, library)) {
+ FT_Done_FreeType (library);
+ goto retry;
+ }
+
+#ifdef HAVE_ATEXIT
+ atexit (free_ft_library); /* First person registers atexit() callback. */
+#endif
+ }
+
+ return library;
+}
+
+static void
+_release_blob (FT_Face ft_face)
+{
+ hb_blob_destroy ((hb_blob_t *) ft_face->generic.data);
+}
+
+void
+hb_ft_font_set_funcs (hb_font_t *font)
+{
+ hb_blob_t *blob = hb_face_reference_blob (font->face);
+ unsigned int blob_length;
+ const char *blob_data = hb_blob_get_data (blob, &blob_length);
+ if (unlikely (!blob_length))
+ DEBUG_MSG (FT, font, "Font face has empty blob");
+
+ FT_Face ft_face = NULL;
+ FT_Error err = FT_New_Memory_Face (get_ft_library (),
+ (const FT_Byte *) blob_data,
+ blob_length,
+ hb_face_get_index (font->face),
+ &ft_face);
+
+ if (unlikely (err)) {
+ hb_blob_destroy (blob);
+ DEBUG_MSG (FT, font, "Font face FT_New_Memory_Face() failed");
+ return;
+ }
+
+ FT_Select_Charmap (ft_face, FT_ENCODING_UNICODE);
+
+ FT_Set_Char_Size (ft_face,
+ font->x_scale, font->y_scale,
+ font->x_ppem * 72 * 64 / font->x_scale,
+ font->y_ppem * 72 * 64 / font->y_scale);
+
+ ft_face->generic.data = blob;
+ ft_face->generic.finalizer = (FT_Generic_Finalizer) _release_blob;
+
+ hb_font_set_funcs (font,
+ _hb_ft_get_font_funcs (),
+ ft_face,
+ (hb_destroy_func_t) FT_Done_Face);
+}
+
+FT_Face
+hb_ft_font_get_face (hb_font_t *font)
+{
+ if (font->destroy == (hb_destroy_func_t) FT_Done_Face ||
+ font->destroy == (hb_destroy_func_t) _do_nothing)
+ return (FT_Face) font->user_data;
+
+ return NULL;
+}
projects / apps / core / preloaded / video-player.git / blobdiff