From 95771d62c57c081fe350e0d33326aaa6a27139da Mon Sep 17 00:00:00 2001
From: Adrian Johnson <ajohnson@redneon.com>
Date: Sun, 29 Jun 2008 19:31:23 +0930
Subject: [PATCH] Implement win32 index_to_ucs4 font backend function

---
 src/cairo-win32-font.c | 93 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 93 insertions(+)

diff --git a/src/cairo-win32-font.c b/src/cairo-win32-font.c
index 140093b22..7b8433486 100644
--- a/src/cairo-win32-font.c
+++ b/src/cairo-win32-font.c
@@ -1552,6 +1552,98 @@ fail1:
     return status;
 }
 
+static cairo_status_t
+_cairo_win32_scaled_font_index_to_ucs4 (void 		*abstract_font,
+					unsigned long    index,
+					uint32_t	*ucs4)
+{
+    cairo_win32_scaled_font_t *scaled_font = abstract_font;
+    GLYPHSET *glyph_set;
+    uint16_t *utf16 = NULL;
+    WORD *glyph_indices = NULL;
+    HDC hdc = NULL;
+    int res;
+    unsigned int i, j, num_glyphs;
+    cairo_status_t status = CAIRO_STATUS_SUCCESS;
+
+    hdc = _get_global_font_dc ();
+    if (!hdc)
+	return _cairo_error (CAIRO_STATUS_NO_MEMORY);
+
+    status = cairo_win32_scaled_font_select_font (&scaled_font->base, hdc);
+    if (status)
+	return status;
+
+    res = GetFontUnicodeRanges(hdc, NULL);
+    if (res == 0) {
+	status = _cairo_win32_print_gdi_error (
+	    "_cairo_win32_scaled_font_index_to_ucs4:GetFontUnicodeRanges");
+	goto exit1;
+    }
+
+    glyph_set = malloc (res);
+    if (glyph_set == NULL) {
+	status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+	goto exit1;
+    }
+
+    res = GetFontUnicodeRanges(hdc, glyph_set);
+    if (res == 0) {
+	status = _cairo_win32_print_gdi_error (
+	    "_cairo_win32_scaled_font_index_to_ucs4:GetFontUnicodeRanges");
+	goto exit1;
+    }
+
+    for (i = 0; i < glyph_set->cRanges; i++) {
+	num_glyphs = glyph_set->ranges[i].cGlyphs;
+
+	utf16 = _cairo_malloc_ab (num_glyphs + 1, sizeof (uint16_t));
+	if (utf16 == NULL) {
+	    status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+	    goto exit1;
+	}
+
+	glyph_indices = _cairo_malloc_ab (num_glyphs + 1, sizeof (WORD));
+	if (glyph_indices == NULL) {
+	    status = _cairo_error (CAIRO_STATUS_NO_MEMORY);
+	    goto exit2;
+	}
+
+	for (j = 0; j < num_glyphs; j++)
+	    utf16[j] = glyph_set->ranges[i].wcLow + j;
+	utf16[j] = 0;
+
+	if (GetGlyphIndicesW (hdc, utf16, num_glyphs, glyph_indices, 0) == GDI_ERROR) {
+	    status = _cairo_win32_print_gdi_error (
+		"_cairo_win32_scaled_font_index_to_ucs4:GetGlyphIndicesW");
+	    goto exit2;
+	}
+
+	for (j = 0; j < num_glyphs; j++) {
+	    if (glyph_indices[j] == index) {
+		*ucs4 = utf16[j];
+		goto exit2;
+	    }
+	}
+
+	free (glyph_indices);
+	glyph_indices = NULL;
+	free (utf16);
+	utf16 = NULL;
+    }
+
+exit2:
+    if (glyph_indices)
+	free (glyph_indices);
+    if (utf16)
+	free (utf16);
+    free (glyph_set);
+exit1:
+    cairo_win32_scaled_font_done_font (&scaled_font->base);
+
+    return status;
+}
+
 static cairo_status_t
 _cairo_win32_scaled_font_init_glyph_surface (cairo_win32_scaled_font_t *scaled_font,
                                              cairo_scaled_glyph_t      *scaled_glyph)
@@ -1788,6 +1880,7 @@ const cairo_scaled_font_backend_t _cairo_win32_scaled_font_backend = {
     _cairo_win32_scaled_font_show_glyphs,
     _cairo_win32_scaled_font_load_truetype_table,
     _cairo_win32_scaled_font_map_glyphs_to_unicode,
+    _cairo_win32_scaled_font_index_to_ucs4,
 };
 
 /* #cairo_win32_font_face_t */