epub: Implement @font-face rules.

Note: font->fallback is not reference counted here. The fallback
mechanism is probably going to have to change when we add text shaping.

1 files changed, 61 insertions, 10 deletions

diff --git a/source/html/html-font.c b/source/html/html-font.c
index 4b138162..d595b582 100644
--- a/source/html/html-font.c
+++ b/source/html/html-font.c
@@ -11,7 +11,7 @@ static const char *font_names[16] =
 	"Courier", "Courier-Oblique", "Courier-Bold", "Courier-BoldOblique",
 };
 
-fz_font *
+static fz_font *
 fz_load_html_fallback_font(fz_context *ctx, fz_html_font_set *set)
 {
 	if (!set->fallback)
@@ -29,30 +29,67 @@ fz_load_html_fallback_font(fz_context *ctx, fz_html_font_set *set)
 }
 
 fz_font *
-fz_load_html_font(fz_context *ctx, fz_html_font_set *set,
-	const char *family, const char *variant, const char *style, const char *weight)
+fz_load_html_builtin_font(fz_context *ctx, fz_html_font_set *set, const char *family, int is_bold, int is_italic)
 {
-	unsigned char *data;
-	unsigned int size;
-
 	int is_mono = !strcmp(family, "monospace");
 	int is_sans = !strcmp(family, "sans-serif");
-	int is_bold = !strcmp(weight, "bold") || !strcmp(weight, "bolder") || atoi(weight) > 400;
-	int is_italic = !strcmp(style, "italic") || !strcmp(style, "oblique");
-
 	int idx = is_mono * 8 + is_sans * 4 + is_bold * 2 + is_italic;
 	if (!set->fonts[idx])
 	{
+		unsigned char *data;
+		unsigned int size;
+
 		data = pdf_lookup_builtin_font(ctx, font_names[idx], &size);
 		if (!data)
 			fz_throw(ctx, FZ_ERROR_GENERIC, "cannot load html font: %s", font_names[idx]);
 		set->fonts[idx] = fz_new_font_from_memory(ctx, font_names[idx], data, size, 0, 1);
 		set->fonts[idx]->fallback = fz_load_html_fallback_font(ctx, set);
 	}
-
 	return set->fonts[idx];
 }
 
+fz_font *
+fz_load_html_font(fz_context *ctx, fz_html_font_set *set, const char *family, int is_bold, int is_italic)
+{
+	fz_html_font_face *custom;
+
+	for (custom = set->custom; custom; custom = custom->next)
+	{
+		if (!strcmp(family, custom->family) &&
+				is_bold == custom->is_bold &&
+				is_italic == custom->is_italic)
+		{
+			return custom->font;
+		}
+	}
+
+	if (!strcmp(family, "monospace") ||
+			!strcmp(family, "sans-serif") ||
+			!strcmp(family, "serif"))
+		return fz_load_html_builtin_font(ctx, set, family, is_bold, is_italic);
+
+	return NULL;
+}
+
+void
+fz_add_html_font_face(fz_context *ctx, fz_html_font_set *set,
+	const char *family, int is_bold, int is_italic, const char *src,
+	fz_font *font)
+{
+	fz_html_font_face *custom;
+
+	custom = fz_malloc_struct(ctx, fz_html_font_face);
+	custom->font = fz_keep_font(ctx, font);
+	custom->src = fz_strdup(ctx, src);
+	custom->family = fz_strdup(ctx, family);
+	custom->is_bold = is_bold;
+	custom->is_italic = is_italic;
+	custom->next = set->custom;
+	set->custom = custom;
+
+	font->fallback = fz_load_html_builtin_font(ctx, set, family, is_bold, is_italic);
+}
+
 fz_html_font_set *fz_new_html_font_set(fz_context *ctx)
 {
 	return fz_malloc_struct(ctx, fz_html_font_set);
@@ -60,9 +97,23 @@ fz_html_font_set *fz_new_html_font_set(fz_context *ctx)
 
 void fz_drop_html_font_set(fz_context *ctx, fz_html_font_set *set)
 {
+	fz_html_font_face *font, *next;
 	int i;
+
+	font = set->custom;
+	while (font)
+	{
+		next = font->next;
+		fz_drop_font(ctx, font->font);
+		fz_free(ctx, font->src);
+		fz_free(ctx, font->family);
+		fz_free(ctx, font);
+		font = next;
+	}
+
 	for (i = 0; i < nelem(set->fonts); ++i)
 		fz_drop_font(ctx, set->fonts[i]);
 	fz_drop_font(ctx, set->fallback);
+
 	fz_free(ctx, set);
 }