Custom font matching and font sources

Implement a simple font sorter (FontSelector) and an interface to deal
with multiple font sources (FontProvider). Unfinished business,
but works for the most part. Currently the only implemented FontProvider
uses fontconfig.

1 files changed, 74 insertions, 0 deletions

diff --git a/libass/ass_fontselect.h b/libass/ass_fontselect.h
new file mode 100644
index 0000000..09c606b
--- /dev/null
+++ b/libass/ass_fontselect.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (C) 2006 Evgeniy Stepanov <eugeni.stepanov@gmail.com>
+ *
+ * This file is part of libass.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
+ * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ */
+
+#ifndef LIBASS_FONTCONFIG_H
+#define LIBASS_FONTCONFIG_H
+
+#include <stdint.h>
+#include "ass_types.h"
+#include "ass.h"
+#include <ft2build.h>
+#include FT_FREETYPE_H
+
+typedef struct font_selector ASS_FontSelector;
+typedef struct font_provider ASS_FontProvider;
+typedef struct font_info ASS_FontInfo;
+
+// get face data
+typedef void *(*GetFaceFunc)(void *);
+
+// check for a glyph
+typedef int (*CheckGlyphFunc)(void *, uint32_t);
+
+// destroy font_info and related data
+typedef void (*DestroyFunc)(void *);
+typedef void (*DestroyProviderFunc)(void *);
+
+typedef struct font_provider_funcs {
+    GetFaceFunc     get_face;
+    CheckGlyphFunc  check_glyph;
+    DestroyFunc     destroy_font;
+    DestroyProviderFunc destroy_provider;
+} ASS_FontProviderFuncs;
+
+typedef struct font_provider_meta_data {
+    char *family;
+    char **fullnames;
+    int n_fullname;
+    int slant;
+    int weight;
+} ASS_FontProviderMetaData;
+
+ASS_FontSelector *
+ass_fontselect_init(ASS_Library *library,
+                    FT_Library ftlibrary, const char *family,
+                    const char *path);
+char *ass_font_select(ASS_FontSelector *priv, ASS_Library *lib,
+                      const char *family, unsigned bold, unsigned italic,
+                      int *index, uint32_t code);
+void ass_fontselect_free(ASS_FontSelector *priv);
+
+// Font provider functions
+ASS_FontProvider *ass_font_provider_new(ASS_FontSelector *selector,
+        ASS_FontProviderFuncs *funcs, void *data);
+int ass_font_provider_add_font(ASS_FontProvider *provider,
+        ASS_FontProviderMetaData *meta, const char *path, unsigned int index,
+        void *data);
+void ass_font_provider_free(ASS_FontProvider *provider);
+
+#endif                          /* LIBASS_FONTCONFIG_H */