[pango/pango2: 45/61] More matrix work

[Matthias Clasen <matthiasc src gnome org>]

commit 718c11c2cf8660b4af123780deba558f4e7c3bc9
Author: Matthias Clasen <mclasen redhat com>
Date:   Sat Jun 11 21:56:39 2022 -0400

    More matrix work
    
    Call it ctm everywhere, and add it to the key
    we use for caching fontsets.

 pango/pango-font-face-private.h      |  4 ++--
 pango/pango-font-face.c              |  6 +++---
 pango/pango-fontmap.c                | 28 ++++++++++++++++++++++++----
 pango/pango-fontset-cached-private.h |  4 ++--
 pango/pango-fontset-cached.c         | 12 ++++++------
 pango/pango-hbface.c                 |  4 ++--
 pango/pango-userface.c               |  4 ++--
 7 files changed, 41 insertions(+), 21 deletions(-)
---
diff --git a/pango/pango-font-face-private.h b/pango/pango-font-face-private.h
index 7fc0aafb8..c184d552a 100644
--- a/pango/pango-font-face-private.h
+++ b/pango/pango-font-face-private.h
@@ -51,7 +51,7 @@ struct _PangoFontFaceClass
   PangoFont *            (* create_font)       (PangoFontFace              *face,
                                                 const PangoFontDescription *desc,
                                                 float                       dpi,
-                                                const PangoMatrix          *matrix);
+                                                const PangoMatrix          *ctm);
 };
 
 #define PANGO_FONT_FACE_CLASS(klass)      (G_TYPE_CHECK_CLASS_CAST ((klass), PANGO_TYPE_FONT_FACE, 
PangoFontFaceClass))
@@ -61,7 +61,7 @@ const char *    pango_font_face_get_faceid      (PangoFontFace              *fac
 PangoFont *     pango_font_face_create_font     (PangoFontFace              *face,
                                                  const PangoFontDescription *desc,
                                                  float                       dpi,
-                                                 const PangoMatrix          *matrix);
+                                                 const PangoMatrix          *ctm);
 
 static inline void
 pango_font_face_set_name (PangoFontFace *face,
diff --git a/pango/pango-font-face.c b/pango/pango-font-face.c
index a7a7514f4..2144a3ebe 100644
--- a/pango/pango-font-face.c
+++ b/pango/pango-font-face.c
@@ -94,7 +94,7 @@ static PangoFont *
 pango_font_face_default_create_font (PangoFontFace              *face,
                                      const PangoFontDescription *desc,
                                      float                       dpi,
-                                     const PangoMatrix          *matrix)
+                                     const PangoMatrix          *ctm)
 {
   return NULL;
 }
@@ -250,11 +250,11 @@ PangoFont *
 pango_font_face_create_font (PangoFontFace              *face,
                              const PangoFontDescription *desc,
                              float                       dpi,
-                             const PangoMatrix          *matrix)
+                             const PangoMatrix          *ctm)
 {
   g_return_val_if_fail (PANGO_IS_FONT_FACE (face), NULL);
 
-  return PANGO_FONT_FACE_GET_CLASS (face)->create_font (face, desc, dpi, matrix);
+  return PANGO_FONT_FACE_GET_CLASS (face)->create_font (face, desc, dpi, ctm);
 }
 
 /*< private >
diff --git a/pango/pango-fontmap.c b/pango/pango-fontmap.c
index 97f5cbbc9..86179928d 100644
--- a/pango/pango-fontmap.c
+++ b/pango/pango-fontmap.c
@@ -133,13 +133,31 @@ pango_font_map_list_model_init (GListModelInterface *iface)
 /* The number of fontsets we keep in the fontset cache */
 #define FONTSET_CACHE_SIZE 256
 
+#define FNV_32_PRIME ((guint32)0x01000193)
 #define FNV1_32_INIT ((guint32)0x811c9dc5)
 
+static guint32
+hash_bytes_fnv (unsigned char *buffer,
+                int            len,
+                guint32        hval)
+{
+  while (len--)
+    {
+      hval *= FNV_32_PRIME;
+      hval ^= *buffer++;
+    }
+
+  return hval;
+}
+
 static guint
 pango_fontset_cached_hash (const PangoFontsetCached *fontset)
 {
   guint32 hash = FNV1_32_INIT;
 
+  if (fontset->ctm)
+    hash = hash_bytes_fnv ((unsigned char *)(fontset->ctm), sizeof (double) * 4, hash);
+
   return (hash ^
           GPOINTER_TO_UINT (fontset->language) ^
 #ifdef HAVE_CAIRO
@@ -156,6 +174,8 @@ pango_fontset_cached_equal (const PangoFontsetCached *a,
 #ifdef HAVE_CAIRO
          cairo_font_options_equal (a->font_options, b->font_options) &&
 #endif
+         (a->ctm == b->ctm ||
+          (a->ctm && b->ctm && memcmp (a->ctm, b->ctm, 4 * sizeof (double)) == 0)) &&
          pango_font_description_equal (a->description, b->description);
 }
 
@@ -470,7 +490,7 @@ pango_font_map_default_load_fontset (PangoFontMap               *self,
 {
   PangoFontsetCached lookup;
   PangoFontsetCached *fontset;
-  const PangoMatrix *matrix;
+  const PangoMatrix *ctm;
   const char *family_name;
   char **families;
   PangoFontDescription *copy;
@@ -485,9 +505,11 @@ pango_font_map_default_load_fontset (PangoFontMap               *self,
     language = pango_context_get_language (context);
 
   family_name = pango_font_description_get_family (description);
+  ctm = pango_context_get_matrix (context);
 
   lookup.language = language;
   lookup.description = (PangoFontDescription *)description;
+  lookup.ctm = ctm;
 #ifdef HAVE_CAIRO
   lookup.font_options = (cairo_font_options_t *)pango_cairo_context_get_merged_font_options (context);
 #endif
@@ -496,9 +518,7 @@ pango_font_map_default_load_fontset (PangoFontMap               *self,
   if (fontset)
     goto done;
 
-  matrix = pango_context_get_matrix (context);
-
-  fontset = pango_fontset_cached_new (description, language, self->dpi, matrix);
+  fontset = pango_fontset_cached_new (description, language, self->dpi, ctm);
 #ifdef HAVE_CAIRO
   fontset->font_options = cairo_font_options_copy (pango_cairo_context_get_merged_font_options (context));
 #endif
diff --git a/pango/pango-fontset-cached-private.h b/pango/pango-fontset-cached-private.h
index ccf28cebc..4b7a37f7e 100644
--- a/pango/pango-fontset-cached-private.h
+++ b/pango/pango-fontset-cached-private.h
@@ -39,7 +39,7 @@ struct _PangoFontsetCached
   PangoLanguage *language;
   PangoFontDescription *description;
   float dpi;
-  const PangoMatrix *matrix;
+  const PangoMatrix *ctm;
   GList cache_link;
   GHashTable *cache;
 
@@ -59,7 +59,7 @@ GType                pango_fontset_cached_get_type       (void) G_GNUC_CONST;
 PangoFontsetCached * pango_fontset_cached_new            (const PangoFontDescription *description,
                                                           PangoLanguage              *language,
                                                           float                       dpi,
-                                                          const PangoMatrix          *matrix);
+                                                          const PangoMatrix          *ctm);
 
 void                 pango_fontset_cached_add_face       (PangoFontsetCached         *self,
                                                           PangoFontFace              *face);
diff --git a/pango/pango-fontset-cached.c b/pango/pango-fontset-cached.c
index 5743a8279..665775d04 100644
--- a/pango/pango-fontset-cached.c
+++ b/pango/pango-fontset-cached.c
@@ -119,7 +119,7 @@ pango_fontset_cached_get_font (PangoFontset *fontset,
                   retval = pango_font_face_create_font (face,
                                                         self->description,
                                                         self->dpi,
-                                                        self->matrix);
+                                                        self->ctm);
 #ifdef HAVE_CAIRO
                   pango_cairo_font_set_font_options (retval, self->font_options);
 #endif
@@ -156,7 +156,7 @@ pango_fontset_cached_get_first_font (PangoFontsetCached *self)
       font = pango_font_face_create_font (face,
                                           self->description,
                                           self->dpi,
-                                          self->matrix);
+                                          self->ctm);
 #ifdef HAVE_CAIRO
       pango_cairo_font_set_font_options (font, self->font_options);
 #endif
@@ -213,7 +213,7 @@ pango_fontset_cached_foreach (PangoFontset            *fontset,
       else if (PANGO_IS_GENERIC_FAMILY (item))
         {
           PangoFontFace *face = pango_generic_family_find_face (PANGO_GENERIC_FAMILY (item), 
self->description, self->language, 0);
-          font = pango_font_face_create_font (face, self->description, self->dpi, self->matrix);
+          font = pango_font_face_create_font (face, self->description, self->dpi, self->ctm);
 #ifdef HAVE_CAIRO
           pango_cairo_font_set_font_options (font, self->font_options);
 #endif
@@ -246,7 +246,7 @@ PangoFontsetCached *
 pango_fontset_cached_new (const PangoFontDescription *description,
                           PangoLanguage              *language,
                           float                       dpi,
-                          const PangoMatrix          *matrix)
+                          const PangoMatrix          *ctm)
 {
   PangoFontsetCached *self;
 
@@ -254,7 +254,7 @@ pango_fontset_cached_new (const PangoFontDescription *description,
   self->language = language;
   self->description = pango_font_description_copy (description);
   self->dpi = dpi;
-  self->matrix = matrix;
+  self->ctm = ctm;
 
   return self;
 }
@@ -268,7 +268,7 @@ pango_fontset_cached_add_face (PangoFontsetCached *self,
   font = pango_font_face_create_font (face,
                                       self->description,
                                       self->dpi,
-                                      self->matrix);
+                                      self->ctm);
 #ifdef HAVE_CAIRO
   pango_cairo_font_set_font_options (font, self->font_options);
 #endif
diff --git a/pango/pango-hbface.c b/pango/pango-hbface.c
index e180f0d44..937c22cd9 100644
--- a/pango/pango-hbface.c
+++ b/pango/pango-hbface.c
@@ -446,11 +446,11 @@ static PangoFont *
 pango_hb_face_create_font (PangoFontFace              *face,
                            const PangoFontDescription *desc,
                            float                       dpi,
-                           const PangoMatrix          *matrix)
+                           const PangoMatrix          *ctm)
 {
   PangoHbFace *self = PANGO_HB_FACE (face);
 
-  return PANGO_FONT (pango_hb_font_new_for_description (self, desc, dpi, matrix));
+  return PANGO_FONT (pango_hb_font_new_for_description (self, desc, dpi, ctm));
 }
 
 static void
diff --git a/pango/pango-userface.c b/pango/pango-userface.c
index 378a1ef9e..c5baab609 100644
--- a/pango/pango-userface.c
+++ b/pango/pango-userface.c
@@ -249,11 +249,11 @@ static PangoFont *
 pango_user_face_create_font (PangoFontFace              *face,
                              const PangoFontDescription *desc,
                              float                       dpi,
-                             const PangoMatrix          *matrix)
+                             const PangoMatrix          *ctm)
 {
   PangoUserFace *self = PANGO_USER_FACE (face);
 
-  return PANGO_FONT (pango_user_font_new_for_description (self, desc, dpi, matrix));
+  return PANGO_FONT (pango_user_font_new_for_description (self, desc, dpi, ctm));
 }
 
 static void