[ATSUI] make drawing glyphs with paths conditional on the style. This
completes the implementation of synthetic bold/oblique while staying
pretty for preselected fonts.

---
commit 3b9c0520c6008a8a55fa12b325a2b8a066d5a322
tree a3db4e662c3b06e4f8981bd9ec7a92badcf57712
parent b98cdf60021b50e35b1ef4c89b60f347b4b037b5
author Brian Ewins <Brian.Ewins@gmail.com> Thu, 04 Jan 2007 16:31:37 +0000
committer Brian Ewins <Brian.Ewins@gmail.com> Thu, 04 Jan 2007 16:31:37 +0000

 src/cairo-atsui-font.c |   62 ++++++++++++++++++++++++++++++++++++++++++++++--
 1 files changed, 60 insertions(+), 2 deletions(-)

diff --git a/src/cairo-atsui-font.c b/src/cairo-atsui-font.c
index 8615b1e..4229994 100644
--- a/src/cairo-atsui-font.c
+++ b/src/cairo-atsui-font.c
@@ -286,6 +286,15 @@ _cairo_atsui_font_create_scaled (cairo_f
     OSStatus err;
     cairo_status_t status;
 
+    ItemCount attribute_count;
+    ATSUAttributeInfo *attribute;
+    /* shouldn't really allow 'no hinting'. */
+    static const ATSStyleRenderingOptions allowed_options = 
+	kATSStyleApplyAntiAliasing
+	|kATSStyleNoAntiAliasing
+	|kATSStyleNoHinting;
+    unsigned int i;
+
     font = malloc(sizeof(cairo_atsui_font_t));
     if (font == NULL)
 	return CAIRO_STATUS_NO_MEMORY;
@@ -293,8 +302,57 @@ _cairo_atsui_font_create_scaled (cairo_f
     _cairo_scaled_font_init(&font->base, font_face, font_matrix, ctm, options,
 			    &cairo_atsui_scaled_font_backend);
 
-    /* Force use of this path, make this conditional later */
-    font->draw_using_paths = true;
+    /* If there are any styles applied to the glyph, 
+     * other than resizing it, we can't draw it with CGContextShowGlyphXXX.
+     * Strikethrough/underline colors, drop shadows cannot be 
+     * supported and may need faked at some point.
+     */
+    font->draw_using_paths = false;
+    err = ATSUGetAllAttributes (style, NULL, 0, &attribute_count); 
+    attribute = malloc (attribute_count * sizeof (ATSUAttributeInfo));
+    err = ATSUGetAllAttributes (style, attribute, attribute_count, NULL); 
+    for (i = 0; i < attribute_count; i++) {
+	switch (attribute[i].fTag) {
+	case kATSUQDBoldfaceTag: 
+	case kATSUQDItalicTag:
+	case kATSUQDUnderlineTag: 
+	case kATSUQDCondensedTag: 
+	case kATSUQDExtendedTag: 
+	case kATSUStyleStrikeThroughTag: 
+	case kATSUStyleDropShadowTag:
+	    {
+		Boolean option;
+		err = ATSUGetAttribute (style, 
+					attribute[i].fTag, 
+					attribute[i].fValueSize, 
+					&option, 
+					NULL);
+		if (option) {
+		    font->draw_using_paths = true;
+		    goto END_ATTRIBUTES;
+		}
+	    }
+	    break;
+	case kATSUStyleRenderingOptionsTag:
+	    {
+		ATSStyleRenderingOptions options;
+		
+		err = ATSUGetAttribute (style, 
+					attribute[i].fTag, 
+					attribute[i].fValueSize, 
+					&options, 
+					NULL);
+
+		if ((options | allowed_options) ^ allowed_options) {
+		    font->draw_using_paths = true;
+		    goto END_ATTRIBUTES;
+		}
+	    }
+	    break;
+	}
+    }
+ END_ATTRIBUTES:  
+    free(attribute);
 
     font->font_to_device = CGAffineTransformMakeWithCairoFontScale (&font->base.scale);
     font->device_to_user_scale = CGAffineTransformInvert (CGAffineTransformMakeWithCairoScaleFactors (ctm));