C++ FT_New_Memory_Face函數代碼示例

/*
 * Function    : libaroma_font
 * Return Value: byte
 * Descriptions: load new font
 */
byte libaroma_font(
    byte fontid,
    LIBAROMA_STREAMP stream) {
  if (!stream) {
    ALOGW("libaroma_font stream not found");
    return 0;
  }
  
  if (fontid >= _LIBAROMA_FONT_MAX_FACE) {
    ALOGW("libaroma_font fontid(%i)>=%i",
      fontid, _LIBAROMA_FONT_MAX_FACE);
    return 0;
  }
  
  /* thread safe */
  _libaroma_font_lock(1);
  
  /* load face */
  FT_Face tmp_face;
  if (FT_New_Memory_Face(_libaroma_font_instance, 
      stream->data,
      stream->size,
      0,
      &tmp_face) == 0) {
    /* set default face size */
    int def_size = libaroma_font_size_px(2);
    
    if (FT_Set_Pixel_Sizes(tmp_face, 0, def_size) == 0) {
      /* save it */
      libaroma_font_free(fontid);
      _libaroma_font_faces[fontid].size   = def_size;
      _libaroma_font_faces[fontid].id     = fontid;
      _libaroma_font_faces[fontid].face   = tmp_face;
      _libaroma_font_faces[fontid].stream = stream;
      _libaroma_font_faces[fontid].cache  =
        libaroma_iarray(libaroma_font_freecache_cb);
      
      /* force ucs2 */
      libaroma_font_set_ucs2(_libaroma_font_faces[fontid].face);
      
      /* init harfbuzz */
      _libaroma_font_hb_init(fontid);
      
      /* unlock */
      _libaroma_font_lock(0);
      ALOGV("font loaded %ibytes (%s)", stream->size, stream->uri);
      return 1;
    }
    else {
      ALOGW("libaroma_font libaroma_font_set_size error");
      FT_Done_Face(tmp_face);
    }
  }
  else {
    ALOGW("libaroma_font FT_New_Memory_Face Error");
    libaroma_stream_close(stream);
  }
  _libaroma_font_lock(0);
  return 0;
} /* End of libaroma_font */

TTF_Font* TTF_New_Memory_Face(const FT_Byte* file_base, FT_Long file_size, int ptsize)
	{
	TTF_Font *font = (TTF_Font*)malloc(sizeof *font);
	if (font == NULL)
		E_Exit("TTF: Out of memory");
	memset(font, 0, sizeof(*font));

	if (FT_New_Memory_Face(library, file_base, file_size, 0, &font->face))
		E_Exit("TTF: Couldn't init font");
	FT_Face face = font->face;
	if (!FT_IS_SCALABLE(face))														// Make sure that our font face is scalable (global metrics)
		E_Exit("TTF: Font is not scalable");

	for (int i = 0; i < face->num_charmaps; i++)									// Set charmap for loaded font
		{
		FT_CharMap charmap = face->charmaps[i];
		if (charmap->platform_id == 3 && charmap->encoding_id == 1)					// Windows Unicode
			{
			FT_Set_Charmap(face, charmap);
			break;
			}
		}
 
	TTF_SetCharSize(font, ptsize);
	bool fontOK = false;
	if (!FT_Load_Glyph(face, 0, FT_LOAD_DEFAULT))									// Test pixel mode
		if (!FT_Render_Glyph(font->face->glyph, FT_RENDER_MODE_NORMAL))				// Render the glyph
			if (font->face->glyph->bitmap.pixel_mode == FT_PIXEL_MODE_GRAY)
				fontOK = true;
	if (!fontOK)
		E_Exit("TTF: Font is not 8 bits gray scale");
	return font;
	}

Font::Font(const int& data_index)
	: _isReady(false)
{
	if (FT_Init_FreeType(&_freeType)) {
		ax::Error("Could not init freetype library.");
		FT_Done_FreeType(_freeType);
	}
	else {

		if (data_index > 1) {
			ax::Error("Only two default font buffer.");

			FT_Done_FreeType(_freeType);
		}
		else {
			FT_Error err
				= FT_New_Memory_Face(_freeType, GetDefaultFontData(data_index),
					GetDefaultFontDataSize(data_index), 0, &_face);

			if (err) {
				ax::Error("Could not open font index", data_index);
				FT_Done_FreeType(_freeType);
			}
			else {
				_isReady = true;
				SetFontSize(12);
//				glGenTextures(1, &_texture);
			}
		}
	}
}

fz_error *
pdf_loadembeddedfont(pdf_font *font, pdf_xref *xref, fz_obj *stmref)
{
	fz_error *error;
	int fterr;
	FT_Face face;
	fz_buffer *buf;

	error = initfontlibs();
	if (error)
		return fz_rethrow(error, "cannot init font libraries");

	pdf_logfont("load embedded font\n");

	error = pdf_loadstream(&buf, xref, fz_tonum(stmref), fz_togen(stmref));
	if (error)
		return fz_rethrow(error, "cannot load font stream");

	fterr = FT_New_Memory_Face(ftlib, buf->rp, buf->wp - buf->rp, 0, &face);
	if (fterr)
	{
		fz_dropbuffer(buf);
		return fz_throw("freetype: cannot load embedded font: %s", ft_errstr(fterr));
	}

	font->ftface = face;
	font->fontdata = buf;

	return fz_okay;
}

static VChar *objchr_to_ftvfontdata(VFont *vfont, FT_ULong charcode)
{
	VChar *che;

	/* Freetype2 */
	FT_Face face;

	/* Load the font to memory */
	if (vfont->temp_pf) {
		err = FT_New_Memory_Face(library,
		                         vfont->temp_pf->data,
		                         vfont->temp_pf->size,
		                         0,
		                         &face);
		if (err) {
			return NULL;
		}
	}
	else {
		err = TRUE;
		return NULL;
	}

	/* Read the char */
	che = freetypechar_to_vchar(face, charcode, vfont->data);

	/* And everything went ok */
	return che;
}

void kGUI::AddFontDir(const char *path)
{
	unsigned int i,n;
	kGUIDir dir;
	unsigned long fontfilesize;
	unsigned char *mem;
	kGUIFontFileInfo *ffi;
	FT_Face ftface;

	dir.LoadDir(path,false,true,"ttf");
	n=dir.GetNumFiles();
	for(i=0;i<n;++i)
	{
		mem=kGUI::LoadFile(dir.GetFilename(i),&fontfilesize);
		if(mem)
		{
			if(FT_New_Memory_Face( kGUIFont::GetLibrary(),
									mem,			/* first byte in memory */
									fontfilesize,	/* size in bytes */
									0,				/* face_index */
									&ftface )==0)
			{
				/* make a name for this font */
				ffi=kGUIFont::m_ffilist.GetEntryPtr(kGUIFont::m_ffinumentries++);
				
				ffi->SetFilename(dir.GetFilename(i));
				ffi->SetFacename(ftface->family_name);
				ffi->SetStyle(ftface->style_name);
				kGUI::Trace("Font fn='%s',face='%s',style='%s'\n",ffi->GetFilename()->GetString(),ffi->GetFacename()->GetString(),ffi->GetStyle()->GetString());
			}
			delete []mem;
		}
	}
}

fz_font *
fz_new_font_from_memory(fz_context *ctx, char *name, unsigned char *data, int len, int index, int use_glyph_bbox)
{
	FT_Face face;
	fz_font *font;
	int fterr;

	fz_keep_freetype(ctx);

	fz_lock(ctx, FZ_LOCK_FREETYPE);
	fterr = FT_New_Memory_Face(ctx->font->ftlib, data, len, index, &face);
	fz_unlock(ctx, FZ_LOCK_FREETYPE);
	if (fterr)
	{
		fz_drop_freetype(ctx);
		fz_throw(ctx, FZ_ERROR_GENERIC, "freetype: cannot load font: %s", ft_error_string(fterr));
	}

	if (!name)
		name = face->family_name;

	font = fz_new_font(ctx, name, use_glyph_bbox, face->num_glyphs);
	font->ft_face = face;
	fz_set_font_bbox(ctx, font,
		(float) face->bbox.xMin / face->units_per_EM,
		(float) face->bbox.yMin / face->units_per_EM,
		(float) face->bbox.xMax / face->units_per_EM,
		(float) face->bbox.yMax / face->units_per_EM);

	return font;
}

	void font_data::init(const std::string& fname, unsigned int _h, bool fromMPQ)
	{
		h = _h;

		if (FT_Init_FreeType(&_library))
		{
			LogError << "FT_Init_FreeType failed" << std::endl;
			throw std::runtime_error("FT_Init_FreeType failed");
		}

		bool failed;
		if (fromMPQ)
		{
			_mpqFile = new MPQFile(fname);
			failed = FT_New_Memory_Face(_library, _mpqFile->get<FT_Byte>(0), _mpqFile->getSize(), 0, &_face) != 0;
		}
		else
		{
			failed = FT_New_Face(_library, fname.c_str(), 0, &_face) != 0;
		}

		if (failed)
		{
			LogError << "FT_New_Face failed (there is probably a problem with your font file)" << std::endl;
			throw std::runtime_error("FT_New_Face failed (there is probably a problem with your font file)");
		}

		// For some twisted reason, Freetype measures font size in terms of 1/64ths of pixels.
		FT_Set_Char_Size(_face, h << 6, h << 6, 72, 72);
	}

FTFace::FTFace(const unsigned char *pBufferBytes, size_t bufferSizeInBytes,
               bool precomputeKerning)
:   numGlyphs(0),
    fontEncodingList(0),
    kerningCache(0),
    err(0)
{
    const FT_Long DEFAULT_FACE_INDEX = 0;
    ftFace = new FT_Face;

    err = FT_New_Memory_Face(*FTLibrary::Instance().GetLibrary(),
                             (FT_Byte const *)pBufferBytes, (FT_Long)bufferSizeInBytes,
                             DEFAULT_FACE_INDEX, ftFace);
    if(err)
    {
        delete ftFace;
        ftFace = 0;
        return;
    }

    FTCleanup::Instance()->RegisterObject(&ftFace);

    numGlyphs = (*ftFace)->num_glyphs;
    hasKerningTable = (FT_HAS_KERNING((*ftFace)) != 0);

    if(hasKerningTable && precomputeKerning)
    {
        BuildKerningCache();
    }
}

fz_error
fz_newfontfrombuffer(fz_font **fontp, unsigned char *data, int len, int index)
{
	fz_error error;
	fz_font *font;
	int fterr;

	error = fz_initfreetype();
	if (error)
		return fz_rethrow(error, "cannot init freetype library");

	font = fz_newfont();

	fterr = FT_New_Memory_Face(fz_ftlib, data, len, index, (FT_Face*)&font->ftface);
	if (fterr)
	{
		fz_free(font);
		return fz_throw("freetype: cannot load font: %s", ft_errorstring(fterr));
	}

	/* SumatraPDF */
	font->_data = data;
	font->_data_len = len;

	*fontp = font;
	return fz_okay;
}

void load_font(caStack* stack)
{
    caValue* filename = circa_input(stack, 0);

    FontFace* font = new FontFace();

    circa_read_file_with_stack(stack, circa_string(filename), &font->rawData);
    if (circa_is_null(&font->rawData))
        return circa_output_error(stack, "Failed to load file");
    
    if (!g_ftLibraryInitialized) {
        FT_Init_FreeType(&g_ftLibrary);
        g_ftLibraryInitialized = true;
    }
    
    int error = FT_New_Memory_Face(g_ftLibrary,
                   (FT_Byte*) circa_blob(&font->rawData),
                   circa_blob_size(&font->rawData),
                   0,
                   &font->ftFace);

    if (error)
        return circa_output_error(stack, "FT_New_Memory_Face failed");

    font->cairoFace = cairo_ft_font_face_create_for_ft_face(font->ftFace, 0);

    caValue* out = circa_set_default_output(stack, 0);
    circa_set_native_ptr(circa_index(out, 0), font, FontFaceRelease);
}

FontCustomPlatformData* createFontCustomPlatformData(SharedBuffer* buffer)
{
    ASSERT_ARG(buffer, buffer);

    int error;

    static FT_Library library = 0;
    if (!library) {
        error = FT_Init_FreeType(&library);
        if (error) {
            library = 0;
            return 0;
        }
    }

    FT_Face face;
    error = FT_New_Memory_Face(library, reinterpret_cast<const FT_Byte*>(buffer->data()), buffer->size(), 0, &face);
    if (error)
        return 0;

    buffer->ref();
    cairo_font_face_t* fontFace = cairo_ft_font_face_create_for_ft_face(face, 0);

    static cairo_user_data_key_t bufferKey;
    cairo_font_face_set_user_data(fontFace, &bufferKey, buffer, releaseData);

    return new FontCustomPlatformData(fontFace);
}

/**
 * Creates gl texture font from true type font;
 * @param ft_library: base font library;
 * @param face_data: pointer to the buffer with font file content; DO NOT FREE that pointer otherway using FT_Face prevets to crash;
 * @param face_data_size: size of buffer with font file content;
 * @param font_size: size of font glyph?
 * @return pointer to the gl_tex_font_s structure;
 */
gl_tex_font_p glf_create_font_mem(FT_Library ft_library, void *face_data, size_t face_data_size, uint16_t font_size)
{
    if(ft_library != nullptr)
    {
        gl_tex_font_p glf = static_cast<gl_tex_font_p>(malloc(sizeof(gl_tex_font_t)));
        glf->ft_face = nullptr;

        if(FT_New_Memory_Face(ft_library, static_cast<const FT_Byte*>(face_data), face_data_size, 0, &glf->ft_face))
        {
            free(glf);
            return nullptr;
        }

        glf->glyphs_count = glf->ft_face->num_glyphs;
        glf->glyphs = static_cast<char_info_p>(malloc(glf->glyphs_count * sizeof(char_info_t)));

        glGetIntegerv(GL_MAX_TEXTURE_SIZE, &glf->gl_max_tex_width);
        glf->gl_tex_width = glf->gl_max_tex_width;
        glf->gl_tex_indexes = nullptr;
        glf->gl_tex_indexes_count = 0;
        glf->gl_real_tex_indexes_count = 0;
        glf_resize(glf, font_size);
        FT_Select_Charmap(glf->ft_face, FT_ENCODING_UNICODE);

        return glf;
    }

    return nullptr;
}

bool FontFreeType::createFontObject(const std::string &fontName, int fontSize)
{
    int dpi = 72;
    
    int len = 0;
    unsigned char* data = FileUtils::getInstance()->getFileData(fontName.c_str(), "rb", (unsigned long *)(&len));
    
    if (!data)
        return false;
    
    // create the new face
    FT_Face face;
    
    // create the face from the data
    if (FT_New_Memory_Face(getFTLibrary(), data, len, 0, &face ))
        return false;
    
    //we want to use unicode
    if (FT_Select_Charmap(face, FT_ENCODING_UNICODE))
        return false;
    
    // set the requested font size
	int fontSizePoints = (int)(64.f * fontSize);
	if (FT_Set_Char_Size(face, fontSizePoints, fontSizePoints, dpi, dpi))
        return false;
    
    // store the face globally
    _fontRef = face;
    
    // save font name locally
    _fontName = fontName;
    
    // done and good
    return true;
}

// Loads a FreeType face from memory.
void* FontDatabase::LoadFace(const byte* data, int data_length, const String& source, bool local_data)
{
	FT_Face face = NULL;
	int error = FT_New_Memory_Face(ft_library, (const FT_Byte*) data, data_length, 0, &face);
	if (error != 0)
	{
		Log::Message(Log::LT_ERROR, "FreeType error %d while loading face from %s.", error, source.CString());
		if (local_data)
			delete[] data;

		return NULL;
	}

	// Initialise the character mapping on the face.
	if (face->charmap == NULL)
	{
		FT_Select_Charmap(face, FT_ENCODING_APPLE_ROMAN);
		if (face->charmap == NULL)
		{
			Log::Message(Log::LT_ERROR, "Font face (from %s) does not contain a Unicode or Apple Roman character map.", source.CString());
			FT_Done_Face(face);
			if (local_data)
				delete[] data;

			return NULL;
		}
	}

	return face;
}