SkShaper::SkShaper(sk_sp<SkTypeface> tf) : fImpl(new Impl) {
fImpl->fTypeface = tf ? std::move(tf) : SkTypeface::MakeDefault();
int index;
std::unique_ptr<SkStreamAsset> asset(fImpl->fTypeface->openStream(&index));
size_t size = asset->getLength();
SkAutoMalloc autoMalloc(size); // TODO(halcanary): Avoid this malloc+copy.
asset->read(autoMalloc.get(), size);
asset = nullptr;
void* ptr = autoMalloc.get();
hb_blob_t* blob = hb_blob_create((char*)autoMalloc.release(), size,
HB_MEMORY_MODE_READONLY, ptr, sk_free);
SkASSERT(blob);
hb_blob_make_immutable(blob);
struct HBFaceDel {
void operator()(hb_face_t* f) { hb_face_destroy(f); }
};
std::unique_ptr<hb_face_t, HBFaceDel> face(hb_face_create(blob, (unsigned)index));
hb_blob_destroy(blob);
SkASSERT(face);
if (!face) {
return;
}
hb_face_set_index(face.get(), (unsigned)index);
hb_face_set_upem(face.get(), fImpl->fTypeface->getUnitsPerEm());
fImpl->fHarfBuzzFont.reset(hb_font_create(face.get()));
SkASSERT(fImpl->fHarfBuzzFont);
hb_font_set_scale(fImpl->fHarfBuzzFont.get(), FONT_SIZE_SCALE, FONT_SIZE_SCALE);
hb_ot_font_set_funcs(fImpl->fHarfBuzzFont.get());
fImpl->fBuffer.reset(hb_buffer_create());
}
static hb_blob_t *
icu_le_hb_reference_table (hb_face_t *face, hb_tag_t tag, void *user_data)
{
const LEFontInstance *fontInstance = (const LEFontInstance *) user_data;
size_t length = 0;
const char *data = (const char *) fontInstance->getFontTable (tag, length);
return hb_blob_create (data, length, HB_MEMORY_MODE_READONLY, NULL, NULL);
}
static hb_blob_t* harfBuzzCoreTextGetTable(hb_face_t* face, hb_tag_t tag, void* userData)
{
CGFontRef cgFont = reinterpret_cast<CGFontRef>(userData);
CFDataRef cfData = CGFontCopyTableForTag(cgFont, tag);
if (!cfData)
return 0;
const char* data = reinterpret_cast<const char*>(CFDataGetBytePtr(cfData));
const size_t length = CFDataGetLength(cfData);
if (!data || !length)
return 0;
return hb_blob_create(data, length, HB_MEMORY_MODE_READONLY, reinterpret_cast<void*>(const_cast<__CFData*>(cfData)), releaseTableData);
}
int glyphwidth (lua_State* L) {
size_t font_l;
unsigned int gid = luaL_checknumber(L, 1);
const char * font_s = luaL_checklstring(L, 2, &font_l);
unsigned int font_index = luaL_checknumber(L, 3);
hb_blob_t* blob = hb_blob_create (font_s, font_l, HB_MEMORY_MODE_WRITABLE, (void*)font_s, NULL);
hb_face_t* hbFace = hb_face_create (blob, font_index);
hb_font_t* hbFont = hb_font_create (hbFace);
short upem = hb_face_get_upem(hbFace);
hb_ft_font_set_funcs(hbFont);
hb_position_t width = hb_font_get_glyph_h_advance(hbFont, gid);
lua_pushnumber(L, width / (double)upem);
return 1;
}
int get_typographic_extents (lua_State *L) {
size_t font_l;
const char * font_s = luaL_checklstring(L, 1, &font_l);
unsigned int font_index = luaL_checknumber(L, 2);
short upem;
double ascender;
double descender;
double x_height;
#ifdef USE_FREETYPE_METRICS
if (!library) FT_Init_FreeType (&library);
FT_Face ft_face = NULL;
FT_Error err = FT_New_Memory_Face (library,
(const FT_Byte *) font_s, font_l, font_index, &ft_face);
if(err) { luaL_error(L, "FT_New_Memory_Face failed"); }
upem = ft_face->units_per_EM;
ascender = ft_face->ascender / (double)upem;
descender = -ft_face->descender / (double)upem;
TT_OS2* os2 = (TT_OS2*) FT_Get_Sfnt_Table(ft_face, ft_sfnt_os2);
if (os2) {
x_height = os2->sxHeight / (double)upem;
}
FT_Done_Face(ft_face);
#else
hb_blob_t* blob = hb_blob_create (font_s, font_l, HB_MEMORY_MODE_WRITABLE, (void*)font_s, NULL);
hb_face_t* hbFace = hb_face_create (blob, font_index);
hb_font_t* hbFont = hb_font_create (hbFace);
hb_font_extents_t metrics = {0,0,0};
upem = hb_face_get_upem(hbFace);
hb_ft_font_set_funcs(hbFont);
hb_font_get_h_extents(hbFont, &metrics);
ascender = metrics.ascender / (double)upem;
descender = metrics.descender / (double)upem;
hb_font_destroy(hbFont);
#endif
lua_newtable(L);
lua_pushstring(L, "ascender");
lua_pushnumber(L, ascender);
lua_settable(L, -3);
lua_pushstring(L, "x_height");
lua_pushnumber(L, x_height);
lua_settable(L, -3);
lua_pushstring(L, "descender");
lua_pushnumber(L, descender);
lua_settable(L, -3);
return 1;
}
hb_blob_t *
gfxDWriteFont::GetFontTable(PRUint32 aTag)
{
const void *data;
UINT32 size;
void *context;
BOOL exists;
HRESULT hr = mFontFace->TryGetFontTable(NS_SWAP32(aTag),
&data, &size, &context, &exists);
if (SUCCEEDED(hr) && exists) {
FontTableRec *ftr = new FontTableRec(mFontFace, context);
return hb_blob_create(static_cast<const char*>(data), size,
HB_MEMORY_MODE_READONLY,
DestroyBlobFunc, ftr);
}
return hb_blob_create_empty();
}
static hb_blob_t* harfBuzzSkiaGetTable(hb_face_t* face, hb_tag_t tag, void* userData)
{
SkTypeface* typeface = reinterpret_cast<SkTypeface*>(userData);
const size_t tableSize = typeface->getTableSize(tag);
if (!tableSize)
return 0;
char* buffer = reinterpret_cast<char*>(fastMalloc(tableSize));
if (!buffer)
return 0;
size_t actualSize = typeface->getTableData(tag, 0, tableSize, buffer);
if (tableSize != actualSize) {
fastFree(buffer);
return 0;
}
return hb_blob_create(const_cast<char*>(buffer), tableSize, HB_MEMORY_MODE_WRITABLE, buffer, fastFree);
}
static hb_blob_t* harfbuzzSkiaGetTable(hb_face_t* face, hb_tag_t tag, void* userData)
{
FontPlatformData* font = reinterpret_cast<FontPlatformData*>(userData);
const size_t tableSize = SkFontHost::GetTableSize(font->uniqueID(), tag);
if (!tableSize)
return 0;
char* buffer = reinterpret_cast<char*>(fastMalloc(tableSize));
if (!buffer)
return 0;
size_t actualSize = SkFontHost::GetTableData(font->uniqueID(), tag, 0, tableSize, buffer);
if (tableSize != actualSize) {
fastFree(buffer);
return 0;
}
return hb_blob_create(const_cast<char*>(buffer), tableSize,
HB_MEMORY_MODE_WRITABLE, buffer, fastFree);
}
static hb_blob_t* referenceTable(hb_face_t*, hb_tag_t tag, void *userData)
{
FT_Face ftFace = reinterpret_cast<FT_Face>(userData);
FT_Byte *buffer;
FT_ULong length = 0;
if (FT_Load_Sfnt_Table(ftFace, tag, 0, NULL, &length))
return NULL;
buffer = reinterpret_cast<FT_Byte*>(malloc(length));
if (buffer == NULL)
return NULL;
if (FT_Load_Sfnt_Table(ftFace, tag, 0, buffer, &length))
{
free(buffer);
return NULL;
}
return hb_blob_create((const char *) buffer, length, HB_MEMORY_MODE_WRITABLE, buffer, free);
}
/**
* pango_ot_info_get:
* @face: a <type>FT_Face</type>.
*
* Returns the #PangoOTInfo structure for the given FreeType font face.
*
* Return value: the #PangoOTInfo for @face. This object will have
* the same lifetime as @face.
*
* Since: 1.2
**/
PangoOTInfo *
pango_ot_info_get (FT_Face face)
{
PangoOTInfo *info;
if (G_LIKELY (face->generic.data && face->generic.finalizer == pango_ot_info_finalizer))
return face->generic.data;
else
{
if (face->generic.finalizer)
face->generic.finalizer (face);
info = face->generic.data = g_object_new (PANGO_TYPE_OT_INFO, NULL);
face->generic.finalizer = pango_ot_info_finalizer;
info->face = face;
if (face->stream->read == NULL) {
hb_blob_t *blob;
blob = hb_blob_create ((const char *) face->stream->base,
(unsigned int) face->stream->size,
HB_MEMORY_MODE_READONLY_MAY_MAKE_WRITABLE,
NULL, NULL);
info->hb_face = hb_face_create_for_data (blob, face->face_index);
hb_blob_destroy (blob);
} else {
info->hb_face = hb_face_create_for_tables (_get_table, NULL, info);
}
hb_face_set_unicode_funcs (info->hb_face, hb_glib_get_unicode_funcs ());
/* XXX this is such a waste if not SFNT */
if (!hb_ot_layout_has_font_glyph_classes (info->hb_face))
synthesize_class_def (info);
}
return info;
}
static hb_blob_t *
_get_table(hb_face_t *, hb_tag_t tag, void *user_data)
{
FT_Face face = (FT_Face) user_data;
FT_ULong length = 0;
FT_Byte *table;
FT_Error error;
hb_blob_t* blob = NULL;
error = FT_Load_Sfnt_Table(face, tag, 0, NULL, &length);
if (!error) {
table = (FT_Byte *) xmalloc(length * sizeof(char));
if (table != NULL) {
error = FT_Load_Sfnt_Table(face, tag, 0, (FT_Byte*)table, &length);
if (!error) {
blob = hb_blob_create((const char*) table, length, HB_MEMORY_MODE_WRITABLE, table, free);
} else {
free(table);
}
}
}
return blob;
}
static hb_blob_t *
_get_table (hb_tag_t tag, void *user_data)
{
PangoOTInfo *info = (PangoOTInfo *) user_data;
FT_Byte *buffer;
FT_ULong length = 0;
FT_Error error;
error = FT_Load_Sfnt_Table (info->face, tag, 0, NULL, &length);
if (error)
return hb_blob_create_empty ();
buffer = g_malloc (length);
if (buffer == NULL)
return hb_blob_create_empty ();
error = FT_Load_Sfnt_Table (info->face, tag, 0, buffer, &length);
if (error)
return hb_blob_create_empty ();
return hb_blob_create ((const char *) buffer, length,
HB_MEMORY_MODE_WRITABLE,
g_free, buffer);
}
int shape (lua_State *L) {
size_t font_l;
const char * text = luaL_checkstring(L, 1);
const char * font_s = luaL_checklstring(L, 2, &font_l);
unsigned int font_index = luaL_checknumber(L, 3);
const char * script = luaL_checkstring(L, 4);
const char * direction_s = luaL_checkstring(L, 5);
const char * lang = luaL_checkstring(L, 6);
double point_size = luaL_checknumber(L, 7);
const char * featurestring = luaL_checkstring(L, 8);
hb_segment_properties_t segment_props;
hb_shape_plan_t *shape_plan;
hb_direction_t direction;
hb_feature_t* features;
int nFeatures = 0;
unsigned int glyph_count = 0;
hb_font_t *hbFont;
hb_buffer_t *buf;
hb_glyph_info_t *glyph_info;
hb_glyph_position_t *glyph_pos;
unsigned int j;
features = scan_feature_string(featurestring, &nFeatures);
if (!strcasecmp(direction_s,"RTL"))
direction = HB_DIRECTION_RTL;
else if (!strcasecmp(direction_s,"TTB"))
direction = HB_DIRECTION_TTB;
else
direction = HB_DIRECTION_LTR;
hb_blob_t* blob = hb_blob_create (font_s, font_l, HB_MEMORY_MODE_WRITABLE, (void*)font_s, NULL);
hb_face_t* hbFace = hb_face_create (blob, font_index);
hbFont = hb_font_create (hbFace);
unsigned int upem = hb_face_get_upem(hbFace);
hb_font_set_scale(hbFont, upem, upem);
/* Harfbuzz's support for OT fonts is great, but
there's currently no support for CFF fonts, so
downgrade to Freetype for those. */
if (strncmp(font_s, "OTTO", 4) == 0) {
hb_ft_font_set_funcs(hbFont);
} else {
hb_ot_font_set_funcs(hbFont);
}
buf = hb_buffer_create();
hb_buffer_add_utf8(buf, text, strlen(text), 0, strlen(text));
hb_buffer_set_script(buf, hb_tag_from_string(script, strlen(script)));
hb_buffer_set_direction(buf, direction);
hb_buffer_set_language(buf, hb_language_from_string(lang,strlen(lang)));
hb_buffer_guess_segment_properties(buf);
hb_buffer_get_segment_properties(buf, &segment_props);
shape_plan = hb_shape_plan_create_cached(hbFace, &segment_props, features, nFeatures, NULL);
int res = hb_shape_plan_execute(shape_plan, hbFont, buf, features, nFeatures);
if (direction == HB_DIRECTION_RTL) {
hb_buffer_reverse(buf); /* URGH */
}
glyph_info = hb_buffer_get_glyph_infos(buf, &glyph_count);
glyph_pos = hb_buffer_get_glyph_positions(buf, &glyph_count);
lua_checkstack(L, glyph_count);
for (j = 0; j < glyph_count; ++j) {
char namebuf[255];
hb_glyph_extents_t extents = {0,0,0,0};
hb_font_get_glyph_extents(hbFont, glyph_info[j].codepoint, &extents);
lua_newtable(L);
lua_pushstring(L, "name");
hb_font_get_glyph_name( hbFont, glyph_info[j].codepoint, namebuf, 255 );
lua_pushstring(L, namebuf);
lua_settable(L, -3);
/* We don't apply x-offset and y-offsets for TTB, which
is arguably a bug. We should. The reason we don't is that
Harfbuzz assumes that you want to shift the character from a
top-center baseline to a bottom-left baseline, and gives you
offsets which do that. We don't want to do that so we ignore the
offsets. I'm told there is a way of configuring HB's idea of the
baseline, and we should use that and take out this condition. */
if (direction != HB_DIRECTION_TTB) {
if (glyph_pos[j].x_offset) {
lua_pushstring(L, "x_offset");
lua_pushnumber(L, glyph_pos[j].x_offset * point_size / upem);
lua_settable(L, -3);
}
if (glyph_pos[j].y_offset) {
lua_pushstring(L, "y_offset");
lua_pushnumber(L, glyph_pos[j].y_offset * point_size / upem);
lua_settable(L, -3);
}
}
lua_pushstring(L, "codepoint");
lua_pushinteger(L, glyph_info[j].codepoint);
lua_settable(L, -3);
lua_pushstring(L, "index");
lua_pushinteger(L, glyph_info[j].cluster);
lua_settable(L, -3);
double height = extents.y_bearing * point_size / upem;
double tHeight = extents.height * point_size / upem;
double width = glyph_pos[j].x_advance * point_size / upem;
/* The PDF model expects us to make positioning adjustments
after a glyph is painted. For this we need to know the natural
glyph advance. libtexpdf will use this to compute the adjustment. */
double glyphAdvance = hb_font_get_glyph_h_advance(hbFont, glyph_info[j].codepoint) * point_size / upem;
if (direction == HB_DIRECTION_TTB) {
height = -glyph_pos[j].y_advance * point_size / upem;
tHeight = -height; /* Set depth to 0 - depth has no meaning for TTB */
width = glyphAdvance;
glyphAdvance = height;
}
lua_pushstring(L, "glyphAdvance");
lua_pushnumber(L, glyphAdvance);
lua_settable(L, -3);
lua_pushstring(L, "width");
lua_pushnumber(L, width);
lua_settable(L, -3);
lua_pushstring(L, "height");
lua_pushnumber(L, height);
lua_settable(L, -3);
lua_pushstring(L, "depth");
lua_pushnumber(L, -tHeight - height);
lua_settable(L, -3);
}
/* Cleanup */
hb_buffer_destroy(buf);
hb_font_destroy(hbFont);
hb_shape_plan_destroy(shape_plan);
free(features);
return glyph_count;
}
static void *
create_blob_inert (void)
{
return hb_blob_create (NULL, 0, HB_MEMORY_MODE_DUPLICATE, NULL, NULL);
}
static void *
create_blob (void)
{
static char data[] = "test data";
return hb_blob_create (data, sizeof (data), HB_MEMORY_MODE_READONLY, NULL, NULL);
}
