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[uwplayer.git] / application / nfont.c

diff --git a/application/nfont.c b/application/nfont.c
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+++ b/application/nfont.c
@@ -0,0 +1,215 @@
+/*
+ * Copyright 2022 Olaf Wintermann
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a 
+ * copy of this software and associated documentation files (the "Software"), 
+ * to deal in the Software without restriction, including without limitation 
+ * the rights to use, copy, modify, merge, publish, distribute, sublicense, 
+ * and/or sell copies of the Software, and to permit persons to whom the 
+ * Software is furnished to do so, subject to the following conditions:
+ * 
+ * The above copyright notice and this permission notice shall be included in 
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR 
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, 
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL 
+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER 
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING 
+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER 
+ * DEALINGS IN THE SOFTWARE.
+ */
+
+#include "nfont.h"
+
+
+/* font list functions */
+
+NFont *FontCreate(Display *dp, FcPattern *pattern)
+{
+    if(!pattern) {
+        return NULL;
+    }
+    FcResult result;
+    pattern = FcPatternDuplicate(pattern);
+    FcPattern *match = XftFontMatch(dp, DefaultScreen(dp), pattern, &result);
+    
+    double sz = 0;
+    result = FcPatternGetDouble (pattern, FC_SIZE, 0, &sz);
+    if(result != FcResultMatch) {
+        FcPatternGetDouble (match, FC_SIZE, 0, &sz);
+    }
+    
+    XftFont *defaultFont = XftFontOpenPattern(dp, match);
+    if(!defaultFont) {
+        FcPatternDestroy(match);
+        return NULL;
+    }
+    
+    NFont *font = malloc(sizeof(NFont));
+    font->display = dp;
+    font->pattern = pattern;
+    font->fail = NULL;
+    font->size = sz;
+    font->ref = 1;
+
+    NFontList *list = malloc(sizeof(NFontList));
+    list->font = defaultFont;
+    list->next = NULL;
+    font->fonts = list;
+    
+    return font;
+}
+
+NFont *FontFromName(Display *dp, const char *name)
+{
+    FcPattern *pattern = FcNameParse((FcChar8*)name);
+    if(!pattern) {
+        return NULL;
+    }
+    NFont *font = FontCreate(dp, pattern);
+    FcPatternDestroy(pattern);
+    return font;
+}
+
+XftFont *FontListAddFontForChar(NFont *f, FcChar32 c)
+{
+    /* charset for char c */
+    FcCharSet *charset = FcCharSetCreate();
+    FcValue value;
+    value.type = FcTypeCharSet;
+    value.u.c = charset;
+    FcCharSetAddChar(charset, c);
+    if(!FcCharSetHasChar(charset, c)) {
+        FcCharSetDestroy(charset);
+        return f->fonts->font;
+    }
+    
+    /* font lookup based on the NFont pattern */ 
+    FcPattern *pattern = FcPatternDuplicate(f->pattern);
+    FcPatternAdd(pattern, FC_CHARSET, value, 0);
+    FcResult result;
+    FcPattern *match = XftFontMatch (
+            f->display, DefaultScreen(f->display), pattern, &result);
+    if(!match) {
+        FcPatternDestroy(pattern);
+        FontAddFail(f, charset);
+        return f->fonts->font;
+    }
+    
+    XftFont *newFont = XftFontOpenPattern(f->display, match);   
+    if(!newFont || !FcCharSetHasChar(newFont->charset, c)) {
+        FcPatternDestroy(pattern);
+        FcPatternDestroy(match);
+        if(newFont) {
+            XftFontClose(f->display, newFont);
+        }
+        FontAddFail(f, charset);
+        return f->fonts->font;
+    }
+    
+    FcCharSetDestroy(charset);
+    
+    NFontList *newElm = malloc(sizeof(NFontList));
+    newElm->font = newFont;
+    newElm->next = NULL;
+    
+    NFontList *elm = f->fonts;
+    NFontList *last = NULL;
+    while(elm) {
+        last = elm;
+        elm = elm->next;
+    }
+    last->next = newElm;
+    
+    
+    return newFont;
+}
+
+XftFont *FindFont(NFont *f, FcChar32 c)
+{
+    if(c < 128) {
+        return f->fonts->font;
+    }
+    
+    /* make sure the char is not in the fail list, because we don't
+     * want to retry font lookups */
+    NCharSetList *fail = f->fail;
+    while(fail) {
+        if(FcCharSetHasChar(fail->charset, c)) {
+            return f->fonts->font;
+        }
+        fail = fail->next;
+        
+    }
+    
+    /* find a font that has this char */
+    NFontList *elm = f->fonts;
+    while(elm) {
+        if(FcCharSetHasChar(elm->font->charset, c)) {
+            return elm->font;
+        }
+        elm = elm->next;
+    }
+    
+    /* open a new font for this char */
+    return FontListAddFontForChar(f, c);
+}
+
+XftFont *FontDefault(NFont *f) {
+    return f->fonts->font;
+}
+
+void FontAddFail(NFont *f, FcCharSet *c)
+{
+    NCharSetList *elm = f->fail;
+    NCharSetList *last = elm;
+    while(elm) {
+        last = elm;
+        elm = elm->next;
+    }
+    
+    NCharSetList *newElm = malloc(sizeof(NCharSetList));
+    newElm->charset = c;
+    newElm->next = NULL;
+    if(last) {
+        last->next = newElm;
+    } else {
+        f->fail = newElm;
+    }
+}
+
+void FontDestroy(NFont *f)
+{
+    NCharSetList *c = f->fail;
+    NCharSetList *nc;
+    while(c) {
+        FcCharSetDestroy(c->charset);
+        nc = c->next;
+        free(c);
+        c = nc;
+    }
+    
+    NFontList *l = f->fonts;
+    NFontList *nl;
+    while(l) {
+        XftFontClose(f->display, l->font);
+        nl = l->next;
+        free(nl);
+        l = nl;
+    }
+    
+    FcPatternDestroy(f->pattern);
+    free(f);
+}
+
+NFont *FontRef(NFont *font)  {
+    font->ref++;
+    return font;
+}
+
+void FontUnref(NFont *font) {
+    if(--font->ref == 0) {
+        FontDestroy(font);
+    }
+}
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