UStrTailorBreaks

src/font/Makefile.am

@@ -14,7 +14,7 @@ SRC_FILES = charset.c charset-arabic.c legacy-bidi.c charset-unicode.c \
             bitmapfont.c scripteasy.c \
             unicode-emoji.c unicode-vop.c \
             unicode-bidi.c \
-            unicode-break.c \
+            unicode-break.c unicode-break-arabic.c unicode-break-indic.c unicode-break-thai.c \
             unicode-joining-types.c unicode-joining.c unicode-shape.c \
             unicode-shape-arabic.c harzbuff-minigui-funcs.c \
             unicode-iterators.c

src/font/unicode-break-arabic.c

@@ -0,0 +1,109 @@
+/*
+ *   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/>.
+ */
+
+/*
+** unicode-break-arabic.c:
+**      The implementation to tailor Arabic breaks
+**
+** Created by WEI Yongming at 2019/03/27
+**
+** This implementation is derived from LGPL'd Pango.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <assert.h>
+
+#include "common.h"
+
+#ifdef _MGCHARSET_UNICODE
+
+#include "minigui.h"
+#include "gdi.h"
+#include "unicode-ops.h"
+
+#define ALEF_WITH_MADDA_ABOVE   0x0622
+#define YEH_WITH_HAMZA_ABOVE    0x0626
+#define ALEF                    0x0627
+#define WAW                     0x0648
+#define YEH                     0x064A
+
+#define MADDAH_ABOVE            0x0653
+#define HAMZA_ABOVE             0x0654
+#define HAMZA_BELOW             0x0655
+
+/*
+ * Arabic characters with canonical decompositions that are not just
+ * ligatures.  The characters U+06C0, U+06C2, and U+06D3 are intentionally
+ * excluded as they are marked as "not an independent letter" in Unicode
+ * Character Database's NamesList.txt
+ */
+#define IS_COMPOSITE(c) (ALEF_WITH_MADDA_ABOVE <= (c) && (c) <= YEH_WITH_HAMZA_ABOVE)
+
+/* If a character is the second part of a composite Arabic character with an Alef */
+#define IS_COMPOSITE_WITH_ALEF(c) (MADDAH_ABOVE <= (c) && (c) <= HAMZA_BELOW)
+
+void __mg_unicode_break_arabic(const Uchar32* ucs, int nr_ucs,
+        BreakOppo* break_oppos)
+{
+    int i;
+    Uchar32 prev_wc, this_wc;
+
+    for (i = 0, prev_wc = 0; i < nr_ucs; i++, prev_wc = this_wc) {
+        this_wc = ucs[i];
+
+        /*
+         * Unset backspace_deletes_character for various combinations.
+         *
+         * A few more combinations may need to be handled here, but are not
+         * handled yet, as expectations of users is not known or may differ
+         * among different languages or users:
+         * some letters combined with U+0658 ARABIC MARK NOON GHUNNA;
+         * combinations considered one letter in Azerbaijani (WAW+SUKUN and
+         * FARSI_YEH+HAMZA_ABOVE); combinations of YEH and ALEF_MAKSURA with
+         * HAMZA_BELOW (Qur'anic); TATWEEL+HAMZA_ABOVE (Qur'anic).
+         *
+         * FIXME: Ordering these in some other way may lower the time spent here, or not.
+         */
+        if (IS_COMPOSITE (this_wc) ||
+                (prev_wc == ALEF && IS_COMPOSITE_WITH_ALEF (this_wc)) ||
+                (this_wc == HAMZA_ABOVE && (prev_wc == WAW || prev_wc == YEH)))
+            break_oppos[i + 1] &= ~BOV_GB_BACKSPACE_DEL_CH;
+    }
+}
+
+#endif /* _MGCHARSET_UNICODE */
+

src/font/unicode-break-thai.c

@@ -0,0 +1,65 @@
+/*
+ *   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/>.
+ */
+
+/*
+** unicode-break-thai.c:
+**      The implementation to tailor Thai breaks
+**
+** Created by WEI Yongming at 2019/03/27
+**
+** This implementation is derived from LGPL'd Pango.
+*/
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <ctype.h>
+#include <assert.h>
+
+#include "common.h"
+
+#ifdef _MGCHARSET_UNICODE
+
+#include "minigui.h"
+#include "gdi.h"
+#include "unicode-ops.h"
+
+void __mg_unicode_break_thai(const Uchar32* ucs, int nr_ucs,
+        BreakOppo* break_oppos)
+{
+    _WRN_PRINTF("NOT IMPLEMENTED");
+}
+
+#endif /* _MGCHARSET_UNICODE */
+

src/font/unicode-break.c

@@ -2994,5 +2994,32 @@ error:
     return 0;
 }
 
+void GUIAPI UStrTailorBreaks(ScriptType writing_system,
+        const Uchar32* ucs, int nr_ucs, BreakOppo* break_oppos)
+{
+    switch ((int)writing_system) {
+        case SCRIPT_ARABIC:
+            __mg_unicode_break_arabic(ucs, nr_ucs, break_oppos);
+            break;
+
+        case SCRIPT_DEVANAGARI:
+        case SCRIPT_BENGALI:
+        case SCRIPT_GURMUKHI:
+        case SCRIPT_GUJARATI:
+        case SCRIPT_ORIYA:
+        case SCRIPT_TAMIL:
+        case SCRIPT_TELUGU:
+        case SCRIPT_KANNADA:
+        case SCRIPT_MALAYALAM:
+        case SCRIPT_SINHALA:
+            __mg_unicode_break_indic(writing_system, ucs, nr_ucs, break_oppos);
+            break;
+
+        case SCRIPT_THAI:
+            __mg_unicode_break_thai(ucs, nr_ucs, break_oppos);
+            break;
+    }
+}
+
 #endif /* _MGCHARSET_UNICODE */
 

src/include/unicode-ops.h

@@ -153,6 +153,13 @@ void __mg_emoji_iterator_fini (EmojiIterator *iter);
 
 BOOL __mg_language_includes_script(LanguageCode lc, ScriptType script);
 
+void __mg_unicode_break_arabic(const Uchar32* ucs, int nr_ucs,
+        BreakOppo* break_oppos);
+void __mg_unicode_break_indic(ScriptType writing_system,
+        const Uchar32* ucs, int nr_ucs, BreakOppo* break_oppos);
+void __mg_unicode_break_thai(const Uchar32* ucs, int nr_ucs,
+        BreakOppo* break_oppos);
+
 #ifdef __cplusplus
 }
 #endif  /* __cplusplus */

src/newgdi/textrunsinfo.c

@@ -441,7 +441,8 @@ out:
 TEXTRUNSINFO* GUIAPI CreateTextRunsInfo(const Uchar32* ucs, int nr_ucs,
         LanguageCode lang_code, ParagraphDir base_dir, GlyphRunDir run_dir,
         GlyphOrient glyph_orient, GlyphOrientPolicy orient_policy,
-        const char* logfont_name, RGBCOLOR color)
+        const char* logfont_name, RGBCOLOR color,
+        BreakOppo* break_oppos)
 {
     BOOL ok = FALSE;
 
@@ -518,6 +519,15 @@ TEXTRUNSINFO* GUIAPI CreateTextRunsInfo(const Uchar32* ucs, int nr_ucs,
         goto out;
     }
 
+    if (break_oppos) {
+        struct list_head* i;
+        list_for_each(i, &runinfo->truns) {
+            TextRun* trun = (TextRun*)i;
+            UStrTailorBreaks(trun->st, runinfo->ucs + trun->si, trun->len,
+                break_oppos + trun->si);
+        }
+    }
+
     ok = TRUE;
 
 out: