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[pango/pango2: 48/84] Add PangoDirectWriteHbFontMap


commit dd3cbb6bbca5b545ddd182e280af00d4374b9868
Author: Luca Bacci <luca bacci982 gmail com>
Date:   Thu Mar 10 12:02:01 2022 +0100

    Add PangoDirectWriteHbFontMap

 pango/meson.build               |   2 +
 pango/pangodwrite-hbfontmap.cpp | 387 ++++++++++++++++++++++++++++++++++++++++
 pango/pangodwrite-hbfontmap.h   |  40 +++++
 3 files changed, 429 insertions(+)
---
diff --git a/pango/meson.build b/pango/meson.build
index c307e66b5..81d2b4140 100644
--- a/pango/meson.build
+++ b/pango/meson.build
@@ -119,6 +119,7 @@ if cairo_dep.found()
     pango_sources += [
       'pangocairo-win32font.c',
       'pangocairo-win32fontmap.c',
+      'pangodwrite-hbfontmap.cpp',
     ]
   endif
 
@@ -161,6 +162,7 @@ if host_system == 'windows'
 
   pango_deps += [
     cc.find_library('gdi32'),
+    cc.find_library('dwrite'),
   ]
 endif
 
diff --git a/pango/pangodwrite-hbfontmap.cpp b/pango/pangodwrite-hbfontmap.cpp
new file mode 100644
index 000000000..ed0175cdb
--- /dev/null
+++ b/pango/pangodwrite-hbfontmap.cpp
@@ -0,0 +1,387 @@
+/* Pango
+ * pangodwrite-hbfontmap.c: Fontmap using DirectWrite
+ *
+ * Copyright (C) 2022 the GTK team
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#include "config.h"
+
+#include <windows.h>
+#include <dwrite.h>
+
+#include <hb-ot.h>
+#include <hb-directwrite.h>
+
+#include "pangodwrite-hbfontmap.h"
+#include "pango-hbfamily-private.h"
+#include "pango-hbfontmap-private.h"
+#include "pango-hbface-private.h"
+#include "pango-hbfont-private.h"
+#include "pango-context.h"
+#include "pango-impl-utils.h"
+#include "pango-trace-private.h"
+
+
+/**
+ * PangoDirectWriteHbFontMap:
+ *
+ * `PangoDirectWriteHbFontMap` is a subclass of `PangoHbFontMap` that
+ * uses DirectWrite to populate the fontmap with the available fonts.
+ */
+
+
+struct _PangoDirectWriteHbFontMap
+{
+  PangoHbFontMap parent_instance;
+};
+
+struct _PangoDirectWriteHbFontMapClass
+{
+  PangoHbFontMapClass parent_class;
+};
+
+#ifdef _MSC_VER
+# define UUID_OF_IDWriteFactory __uuidof (IDWriteFactory)
+#else
+# define UUID_OF_IDWriteFactory IID_IDWriteFactory
+#endif
+
+/* {{{ DirectWrite utilities */
+
+static PangoStretch
+util_to_pango_stretch (DWRITE_FONT_STRETCH stretch)
+{
+  int value = (int) stretch;
+
+  if G_UNLIKELY (stretch <= DWRITE_FONT_STRETCH_UNDEFINED ||
+                 stretch > DWRITE_FONT_STRETCH_ULTRA_EXPANDED)
+    return PANGO_STRETCH_NORMAL;
+
+  return (PangoStretch) --value;
+}
+
+static PangoStyle
+util_to_pango_style (DWRITE_FONT_STYLE style)
+{
+  switch (style)
+    {
+    case DWRITE_FONT_STYLE_NORMAL:
+      return PANGO_STYLE_NORMAL;
+    case DWRITE_FONT_STYLE_OBLIQUE:
+      return PANGO_STYLE_OBLIQUE;
+    case DWRITE_FONT_STYLE_ITALIC:
+      return PANGO_STYLE_ITALIC;
+    default:
+      g_assert_not_reached ();
+      return PANGO_STYLE_NORMAL;
+    }
+}
+
+static int
+util_map_weight (int weight)
+{
+  if G_UNLIKELY (weight < 100)
+    weight = 100;
+
+  if G_UNLIKELY (weight > 1000)
+    weight = 1000;
+
+  return weight;
+}
+
+static PangoWeight
+util_to_pango_weight (DWRITE_FONT_WEIGHT weight)
+{
+  /* DirectWrite weight values range from 1 to 999, Pango values
+   * range from 100 to 1000. */
+
+  return (PangoWeight) util_map_weight (weight);
+}
+
+static PangoFontDescription*
+util_get_pango_font_description (IDWriteFont *font,
+                                 const char *family_name)
+{
+  DWRITE_FONT_STRETCH stretch = font->GetStretch ();
+  DWRITE_FONT_STYLE style = font->GetStyle ();
+  DWRITE_FONT_WEIGHT weight = font->GetWeight ();
+  PangoFontDescription *description;
+
+  description = pango_font_description_new ();
+  pango_font_description_set_family (description, family_name);
+  pango_font_description_set_stretch (description, util_to_pango_stretch (stretch));
+  pango_font_description_set_style (description, util_to_pango_style (style));
+  pango_font_description_set_weight (description, util_to_pango_weight (weight));
+
+  return description;
+}
+
+static char*
+util_free_to_string (IDWriteLocalizedStrings *strings)
+{
+  char *string = NULL;
+  HRESULT hr;
+
+  if (strings->GetCount() > 0)
+    {
+      UINT32 index = 0;
+      BOOL exists = FALSE;
+      UINT32 length = 0;
+
+      hr = strings->FindLocaleName (L"en-us", &index, &exists);
+      if (FAILED (hr) || !exists || index == UINT32_MAX)
+        index = 0;
+
+      hr = strings->GetStringLength (index, &length);
+      if (SUCCEEDED (hr) && length > 0)
+        {
+          gunichar2 *string_utf16 = g_new (gunichar2, length + 1);
+
+          hr = strings->GetString (index, (wchar_t*) string_utf16, length + 1);
+          if (SUCCEEDED (hr))
+            string = g_utf16_to_utf8 (string_utf16, -1, NULL, NULL, NULL);
+
+          g_free (string_utf16);
+        }
+    }
+
+  strings->Release ();
+
+  return string;
+}
+
+static char*
+util_dwrite_get_font_variant_name (IDWriteFont *font)
+{
+  IDWriteLocalizedStrings *strings = NULL;
+  HRESULT hr;
+
+  hr = font->GetFaceNames (&strings);
+  if (FAILED (hr) || strings == NULL)
+    {
+      g_warning ("IDWriteFont::GetFaceNames failed with error code %x", (unsigned) hr);
+      return NULL;
+    }
+
+  return util_free_to_string (strings);
+}
+
+static char*
+util_dwrite_get_font_family_name (IDWriteFontFamily *family)
+{
+  IDWriteLocalizedStrings *strings = NULL;
+  HRESULT hr;
+
+  hr = family->GetFamilyNames (&strings);
+  if (FAILED (hr) || strings == NULL)
+    {
+      g_warning ("IDWriteFontFamily::GetFamilyNames failed with error code %x", (unsigned) hr);
+      return NULL;
+    }
+
+  return util_free_to_string (strings);
+}
+
+static PangoHbFace*
+util_create_pango_hb_face (IDWriteFontFamily *family,
+                           IDWriteFont *font,
+                           IDWriteFontFace *face)
+{
+  char *family_name = util_dwrite_get_font_family_name (family);
+  char *variant_name = util_dwrite_get_font_variant_name (font);
+  PangoHbFace *pango_face = NULL;
+
+  if (family_name && variant_name)
+    {
+      PangoFontDescription *description = util_get_pango_font_description (font, family_name);
+      hb_face_t *hb_face = hb_directwrite_face_create (face);
+      char *name = g_strconcat (family_name, " ", variant_name, NULL);
+
+      pango_face = pango_hb_face_new_from_hb_face (hb_face, -1, name, description);
+
+      g_free (name);
+      hb_face_destroy (hb_face);
+      pango_font_description_free (description);
+    }
+
+  g_free (family_name);
+  g_free (variant_name);
+
+  return pango_face;
+}
+
+/* }}} */
+/* {{{ PangoHbFontMap implementation */
+
+static void
+pango_direct_write_hb_font_map_populate (PangoHbFontMap *map)
+{
+  PangoDirectWriteHbFontMap *self = PANGO_DIRECT_WRITE_HB_FONT_MAP (map);
+  IDWriteFactory *factory = NULL;
+  IDWriteFontCollection *collection = NULL;
+  UINT32 count;
+  HRESULT hr;
+
+  hr = DWriteCreateFactory (DWRITE_FACTORY_TYPE_SHARED,
+                            UUID_OF_IDWriteFactory,
+                            reinterpret_cast<IUnknown**> (&factory));
+  if (FAILED (hr) || !factory)
+    g_error ("DWriteCreateFactory failed with error code %x", (unsigned)hr);
+
+  hr = factory->GetSystemFontCollection (&collection, FALSE);
+  if (FAILED (hr) || collection == NULL)
+    g_error ("IDWriteFactory::GetSystemFontCollection failed with error code %x\n", (unsigned)hr);
+
+  count = collection->GetFontFamilyCount ();
+
+  for (UINT32 i = 0; i < count; i++)
+    {
+      IDWriteFontFamily *family = NULL;
+      UINT32 font_count;
+
+      hr = collection->GetFontFamily (i, &family);
+      if G_UNLIKELY (FAILED (hr) || family == NULL)
+        {
+          g_warning ("IDWriteFontCollection::GetFontFamily failed with error code %x\n", (unsigned)hr);
+          continue;
+        }
+
+      font_count = family->GetFontCount ();
+
+      for (UINT32 j = 0; j < font_count; j++)
+        {
+          IDWriteFont *font = NULL;
+          IDWriteFontFace *face = NULL;
+          PangoHbFace *pango_face = NULL;
+
+          hr = family->GetFont (j, &font);
+          if (FAILED (hr) || font == NULL)
+            {
+              g_warning ("IDWriteFontFamily::GetFont failed with error code %x\n", (unsigned)hr);
+              break;
+            }
+
+          hr = font->CreateFontFace (&face);
+          if (FAILED (hr) || face == NULL)
+            {
+              g_warning ("IDWriteFont::CreateFontFace failed with error code %x\n", (unsigned)hr);
+              font->Release ();
+              continue;
+            }
+
+          pango_face = util_create_pango_hb_face (family, font, face);
+          if (pango_face)
+            pango_hb_font_map_add_face (PANGO_HB_FONT_MAP (self),
+                                        PANGO_FONT_FACE (pango_face));
+
+          face->Release ();
+          font->Release ();
+        }
+
+      family->Release ();
+    }
+
+  collection->Release ();
+  collection = NULL;
+
+  factory->Release ();
+  factory = NULL;
+
+  /* Add generic aliases */
+  struct {
+    const char *alias_name;
+    const char *family_name;
+  } aliases[] = {
+    { "monospace",  "Consolas" },
+    { "sans-serif", "Arial" },
+    { "serif",      "Times New Roman" },
+    { "system-ui",  "Segoe UI" },
+    { "emoji",      "Segoe UI Emoji" }
+  };
+
+#if 0
+  if (IsWindows11OrLater ())
+    aliases[0].family_name = "Cascadia Mono";
+#endif
+
+  for (gsize i = 0; i < G_N_ELEMENTS (aliases); i++)
+    {
+      PangoFontFamily *family = pango_font_map_get_family (PANGO_FONT_MAP (map), aliases[i].family_name);
+
+      if (family)
+        {
+          PangoGenericFamily *alias_family;
+
+          alias_family = pango_generic_family_new (aliases[i].alias_name);
+          pango_generic_family_add_family (alias_family, family);
+          pango_hb_font_map_add_family (map, PANGO_FONT_FAMILY (alias_family));
+        }
+    }
+}
+
+/* }}} */
+/* {{{ PangoFontMap implementation */
+
+G_DEFINE_TYPE (PangoDirectWriteHbFontMap, pango_direct_write_hb_font_map, PANGO_TYPE_HB_FONT_MAP)
+
+static void
+pango_direct_write_hb_font_map_init (PangoDirectWriteHbFontMap *self)
+{
+  pango_hb_font_map_repopulate (PANGO_HB_FONT_MAP (self), TRUE);
+}
+
+static void
+pango_direct_write_hb_font_map_finalize (GObject *object)
+{
+  /* PangoDirectWriteHbFontMap *self = PANGO_DIRECT_WRITE_HB_FONT_MAP (object); */
+
+  G_OBJECT_CLASS (pango_direct_write_hb_font_map_parent_class)->finalize (object);
+}
+
+static void
+pango_direct_write_hb_font_map_class_init (PangoDirectWriteHbFontMapClass *class_)
+{
+  GObjectClass *object_class = G_OBJECT_CLASS (class_);
+  PangoHbFontMapClass *hb_font_map_class = PANGO_HB_FONT_MAP_CLASS (class_);
+
+  object_class->finalize = pango_direct_write_hb_font_map_finalize;
+
+  hb_font_map_class->populate = pango_direct_write_hb_font_map_populate;
+}
+
+/* }}} */
+ /* {{{ Public API */
+
+/**
+ * pango_direct_write_hb_font_map_new:
+ *
+ * Creates a new `PangoDirectWriteHbFontMap` object.
+ *
+ * Returns: a new `PangoDirectWriteHbFontMap`
+ */
+PangoDirectWriteHbFontMap *
+pango_direct_write_hb_font_map_new (void)
+{
+  return
+    (PangoDirectWriteHbFontMap*)
+    g_object_new (PANGO_TYPE_DIRECT_WRITE_HB_FONT_MAP, NULL);
+}
+
+/* }}} */
+
+/* vim:set foldmethod=marker expandtab: */
diff --git a/pango/pangodwrite-hbfontmap.h b/pango/pangodwrite-hbfontmap.h
new file mode 100644
index 000000000..9ce8791ec
--- /dev/null
+++ b/pango/pangodwrite-hbfontmap.h
@@ -0,0 +1,40 @@
+/* Pango
+ * pangodwrite-hbfontmap.h: Fontmap using DirectWrite
+ *
+ * Copyright (C) 2022 the GTK team
+ *
+ * This library is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Library General Public
+ * License as published by the Free Software Foundation; either
+ * version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ * Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with this library; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 02111-1307, USA.
+ */
+
+#pragma once
+
+#include <pango/pango.h>
+
+G_BEGIN_DECLS
+
+#define PANGO_TYPE_DIRECT_WRITE_HB_FONT_MAP (pango_direct_write_hb_font_map_get_type ())
+
+PANGO_AVAILABLE_IN_ALL
+PANGO_DECLARE_INTERNAL_TYPE (PangoDirectWriteHbFontMap,
+                             pango_direct_write_hb_font_map,
+                             PANGO, DIRECT_WRITE_HB_FONT_MAP,
+                             PangoHbFontMap)
+
+PANGO_AVAILABLE_IN_ALL
+PangoDirectWriteHbFontMap * pango_direct_write_hb_font_map_new (void);
+
+
+G_END_DECLS
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