diff --git a/include/gdi.h b/include/gdi.h
index 424db440..eb82a31f 100644
--- a/include/gdi.h
+++ b/include/gdi.h
@@ -9277,6 +9277,51 @@ typedef enum {
     WS_PRE_LINE,
 } WhiteSpaceRule;
 
+/**
+ * The character transformation rule for \a GetGlyphsByRules.
+ */
+typedef enum {
+    CT_NONE,
+    CT_CAPITALIZE,
+    CT_UPPERCASE,
+    CT_LOWERCASE,
+    CT_FULL_WIDTH,
+    CT_FULL_SIZE_KANA,
+} CharTransformRule;
+
+/**
+ * \fn int GUIAPI GetGlyphsByRules(LOGFONT* logfont, const char* mstr, int mstr_len,
+ *          WhiteSpaceRule white_space, CharTransformRule trans_rule,
+ *          Glyph32** glyphs, int* nr_glyphs);
+ * \brief Calculate the glyph string under the specified white space and
+ *        transformation rule.
+ *
+ * This function calculates and allocates the glyph string from a multi-byte
+ * string under the specified white space rule \a white_space and transformation
+ * rule.
+ *
+ * The function will return if it encounters any hard line break or the null character.
+ * The hard line break will be included in the returned glyphs if there was one.
+ *
+ * \param logfont The logfont used to parse the string.
+ * \param mstr The pointer to the multi-byte string.
+ * \param mstr_len The length of \a mstr in bytes.
+ * \param white_space The white space rule. This parameter specifies two things:
+ *          - whether and how white space inside the string is collapsed.
+ *          - whether lines may wrap at unforced soft wrap opportunities.
+ * \param trans_rule The character transformation rule.
+ * \param glyphs The pointer to a buffer to store the address of the
+ *        allocated glyph string.
+ * \param nr_glyphs The buffer to store the number of the allocated glyphs.
+ *
+ * \return The number of the bytes consumed in \a mstr.
+ *
+ * \sa WhiteSpaceRule, CharTransformRule, DrawGlyphStringEx
+ */
+MG_EXPORT int GUIAPI GetGlyphsByRules(LOGFONT* logfont, const char* mstr, int mstr_len,
+            WhiteSpaceRule white_space, CharTransformRule trans_rule,
+            Glyph32** glyphs, int* nr_glyphs);
+
 /**
  * \fn int GUIAPI GetGlyphsExtentPointEx(LOGFONT* logfont, int x, int y,
  *          const Glyph32* glyphs, int nr_glyphs,
diff --git a/src/newgdi/Makefile.am b/src/newgdi/Makefile.am
index 32c839ca..62b72911 100644
--- a/src/newgdi/Makefile.am
+++ b/src/newgdi/Makefile.am
@@ -14,12 +14,12 @@ SRC_FILES = gdi.c attr.c clip.c map.c coor.c rect.c  \
               region.c generators.c polygon.c flood.c \
               advapi.c midash.c mispans.c miwideline.c \
               mifillarc.c mifpolycon.c miarc.c rotatebmp.c \
-			  text.c glyph.c bidi.c \
-			  textout.c tabbedtextout.c drawtext.c 
+              text.c glyph.c bidi.c glyph-css.c \
+              textout.c tabbedtextout.c drawtext.c
 endif
 
 HDR_FILES = drawtext.h mi.h midc.h mistruct.h miwideline.h \
-            pixel_ops.h mifillarc.h mispans.h polygon.h mifpoly.h 
+            pixel_ops.h mifillarc.h mispans.h polygon.h mifpoly.h
 
 libnewgdi_la_SOURCES = $(SRC_FILES) $(HDR_FILES)
 
diff --git a/src/newgdi/glyph-css.c b/src/newgdi/glyph-css.c
new file mode 100644
index 00000000..800e0d6f
--- /dev/null
+++ b/src/newgdi/glyph-css.c
@@ -0,0 +1,84 @@
+/*
+ *   This file is part of MiniGUI, a mature cross-platform windowing
+ *   and Graphics User Interface (GUI) support system for embedded systems
+ *   and smart IoT devices.
+ *
+ *   Copyright (C) 2002~2018, Beijing FMSoft Technologies Co., Ltd.
+ *   Copyright (C) 1998~2002, WEI Yongming
+ *
+ *   This program is free software: you can redistribute it and/or modify
+ *   it under the terms of the GNU General Public License as published by
+ *   the Free Software Foundation, either version 3 of the License, or
+ *   (at your option) any later version.
+ *
+ *   This program is distributed in the hope that it will be useful,
+ *   but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *   GNU General Public License for more details.
+ *
+ *   You should have received a copy of the GNU General Public License
+ *   along with this program.  If not, see <http://www.gnu.org/licenses/>.
+ *
+ *   Or,
+ *
+ *   As this program is a library, any link to this program must follow
+ *   GNU General Public License version 3 (GPLv3). If you cannot accept
+ *   GPLv3, you need to be licensed from FMSoft.
+ *
+ *   If you have got a commercial license of this program, please use it
+ *   under the terms and conditions of the commercial license.
+ *
+ *   For more information about the commercial license, please refer to
+ *   <http://www.minigui.com/en/about/licensing-policy/>.
+ */
+
+/*
+** glyph-css.c: The implementation of APIs which conform to the specifiction
+** of CSS 3
+**
+** Create date: 2019/01/16
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "common.h"
+#include "minigui.h"
+#include "gdi.h"
+#include "window.h"
+#include "devfont.h"
+#include "cliprect.h"
+#include "gal.h"
+#include "internals.h"
+#include "ctrlclass.h"
+#include "dc.h"
+#include "pixel_ops.h"
+#include "cursor.h"
+#include "drawtext.h"
+#include "fixedmath.h"
+#include "glyph.h"
+
+int GUIAPI GetGlyphsByRules(LOGFONT* logfont, const char* mstr, int mstr_len,
+            WhiteSpaceRule white_space, CharTransformRule trans_rule,
+            Glyph32** glyphs, int* nr_glyphs)
+{
+    return 0;
+}
+
+int GUIAPI GetGlyphsExtentPointEx (LOGFONT* logfont, int x, int y,
+        const Glyph32* glyphs, int nr_glyphs,
+        DWORD break_flags, int letter_spacing, int word_spacing,
+        WhiteSpaceRule white_space, int tab_size,
+        int max_extent,
+        LINEEXTINFO* line_ext_info, GLYPHEXTINFO* glyph_ext_info, POINT* pts)
+{
+    return 0;
+}
+
+int GUIAPI DrawGlyphStringEx (HDC hdc, const Glyph32* glyphs, int nr_glyphs,
+        const POINT* pts)
+{
+    return 0;
+}
+