[gtk/pango2-windows: 9/10] gtkimcontextime.c: Port to Pango2 APIs

[Chun-wei Fan <fanchunwei src gnome org>]

commit 9f2b68393d82c9f31deca6dd850e77fadd9a6087
Author: Chun-wei Fan <fanchunwei src gnome org>
Date:   Wed Jul 6 13:57:16 2022 +0800

    gtkimcontextime.c: Port to Pango2 APIs
    
    Update the code to use Pango2 APIs, by removing includes to pangowin32, which
    is gone, and replacing relevant calls to Pango2 equivilants.
    
    Replace the call to pango_win32_font_logfontw() by retrieving instead the
    underlying hb_font_t, and calling hb_uniscribe_font_get_logfontw(), but preedit
    fonts are currently not working until a resolution to HarfBuzz issue #3683 can
    be found.  Since we are still using Windows IME APIs for input, we need the
    HarfBuzz GDI/Uniscribe items to be included in the HarfBuzz builds.

 gtk/gtkimcontextime.c | 50 ++++++++++++++++++++++++--------------------------
 1 file changed, 24 insertions(+), 26 deletions(-)
---
diff --git a/gtk/gtkimcontextime.c b/gtk/gtkimcontextime.c
index 54b70a9f2e..e5e7a1c450 100644
--- a/gtk/gtkimcontextime.c
+++ b/gtk/gtkimcontextime.c
@@ -39,16 +39,8 @@
 #include "gtk/gtkstylecontextprivate.h"
 #include "gtk/gtkcssstyleprivate.h"
 
-/* avoid warning */
-#ifdef STRICT
-# undef STRICT
-# include <pango/pangowin32.h>
-# ifndef STRICT
-#   define STRICT 1
-# endif
-#else /* STRICT */
-#   include <pango/pangowin32.h>
-#endif /* STRICT */
+#include <pango2/pango.h>
+#include <hb-uniscribe.h>
 
 /* Determines what happens when focus is lost while preedit is in process. */
 typedef enum {
@@ -557,7 +549,7 @@ get_pango_attr_list (GtkIMContextIME *context_ime, const char *utf8str)
               switch (buf[spos])
                 {
                 case ATTR_TARGET_CONVERTED:
-                  attr = pango2_attr_underline_new (PANGO_UNDERLINE_DOUBLE);
+                  attr = pango2_attr_underline_new (PANGO2_LINE_STYLE_DOUBLE);
                   pango2_attribute_set_range (attr, sidx, eidx);
                   pango2_attr_list_change (attrs, attr);
                   f_red = f_green = f_blue = 0;
@@ -572,16 +564,16 @@ get_pango_attr_list (GtkIMContextIME *context_ime, const char *utf8str)
                   b_red = b_green = b_blue = 0x7fff;
                   break;
                 default:        /* ATTR_INPUT,ATTR_CONVERTED,ATTR_FIXEDCONVERTED */
-                  attr = pango2_attr_underline_new (PANGO_UNDERLINE_SINGLE);
+                  attr = pango2_attr_underline_new (PANGO2_LINE_STYLE_SOLID);
                   pango2_attribute_set_range (attr, sidx, eidx);
                   pango2_attr_list_change (attrs, attr);
                   f_red = f_green = f_blue = 0;
                   b_red = b_green = b_blue = 0xffff;
                 }
-              attr = pango2_attr_foreground_new (&(PangoColor){f_red, f_green, f_blue});
+              attr = pango2_attr_foreground_new (&(Pango2Color){f_red, f_green, f_blue});
               pango2_attribute_set_range (attr, sidx, eidx);
               pango2_attr_list_change (attrs, attr);
-              attr = pango2_attr_background_new (&(PangoColor){b_red, b_green, b_blue};
+              attr = pango2_attr_background_new (&(Pango2Color){b_red, b_green, b_blue});
               pango2_attribute_set_range (attr, sidx, eidx);
               pango2_attr_list_change (attrs, attr);
 
@@ -828,10 +820,11 @@ gtk_im_context_ime_set_preedit_font (GtkIMContext *context)
   HKL ime = GetKeyboardLayout (0);
   const char *lang;
   gunichar wc;
-  PangoContext *pango_context;
-  PangoFont *font;
-  LOGFONT *logfont;
-  PangoFontDescription *font_desc;
+  Pango2Context *pango_context;
+  Pango2Font *font;
+  LOGFONTW *logfont;
+  Pango2FontDescription *font_desc;
+  hb_font_t *hbfont;
 
   g_return_if_fail (GTK_IS_IM_CONTEXT_IME (context));
 
@@ -888,13 +881,13 @@ gtk_im_context_ime_set_preedit_font (GtkIMContext *context)
       /* We know what language it is. Look for a character, any
        * character, that language needs.
        */
-      PangoLanguage *pango_lang = pango_language_from_string (lang);
-      PangoFontset *fontset =
-        pango_context_load_fontset (pango_context,
+      Pango2Language *pango_lang = pango2_language_from_string (lang);
+      Pango2Fontset *fontset =
+        pango2_context_load_fontset (pango_context,
                                                            font_desc,
                                                            pango_lang);
       gunichar *sample =
-       g_utf8_to_ucs4 (pango_language_get_sample_string (pango_lang),
+       g_utf8_to_ucs4 (pango2_language_get_sample_string (pango_lang),
                        -1, NULL, NULL, NULL);
       wc = 0x4E00;             /* In all CJK languages? */
       if (sample != NULL)
@@ -909,18 +902,23 @@ gtk_im_context_ime_set_preedit_font (GtkIMContext *context)
              }
          g_free (sample);
        }
-      font = pango_fontset_get_font (fontset, wc);
+      font = pango2_fontset_get_font (fontset, wc);
       g_object_unref (fontset);
     }
   else
-    font = pango_context_load_font (pango_context, font_desc);
+    font = pango2_context_load_font (pango_context, font_desc);
 
   if (!font)
     goto ERROR_OUT;
 
-  logfont = pango_win32_font_logfont (font);
+  /*
+   * XXX: This awaits a solution to be found for HarfBuzz on platform items
+   *      https://github.com/harfbuzz/harfbuzz/issues/3683
+   */
+  hbfont = pango2_font_get_hb_font (font);
+  logfont = hb_uniscribe_font_get_logfontw (hbfont);
   if (logfont)
-    ImmSetCompositionFont (himc, logfont);
+    ImmSetCompositionFontW (himc, logfont);
 
   g_object_unref (font);