Add -Wswitch-enum compiler flag and fix all trivial warnings

configure.in

@@ -535,7 +535,7 @@ WARN_CFLAGS=""
 if test "x$GCC" = "xyes"; then
 	WARN_CFLAGS="-Wall -Wsign-compare -Werror-implicit-function-declaration \
 	-Wstrict-aliasing=2 -Wpointer-arith -Wwrite-strings -Winit-self \
-	-Wunsafe-loop-optimizations \
+	-Wswitch-enum -Wunsafe-loop-optimizations \
 	-Wpacked -Wmissing-format-attribute -Wstrict-prototypes \
 	-Wmissing-prototypes -Wmissing-declarations -Wdeclaration-after-statement \
 	-Wnested-externs -fno-strict-aliasing -Wold-style-definition"

pixman/src/fbpict.c

@@ -1798,6 +1798,17 @@ pixman_composite (pixman_operator_t	op,
 	    }
 	}
 	break;
+    case PIXMAN_OPERATOR_CLEAR:
+    case PIXMAN_OPERATOR_DST:
+    case PIXMAN_OPERATOR_OVER_REVERSE:
+    case PIXMAN_OPERATOR_IN:
+    case PIXMAN_OPERATOR_IN_REVERSE:
+    case PIXMAN_OPERATOR_OUT:
+    case PIXMAN_OPERATOR_OUT_REVERSE:
+    case PIXMAN_OPERATOR_ATOP:
+    case PIXMAN_OPERATOR_ATOP_REVERSE:
+    case PIXMAN_OPERATOR_XOR:
+    case PIXMAN_OPERATOR_SATURATE:
     default:
 	/* For any operator not specifically handled above we default out to the general code. */
 	func = NULL;

src/cairo-ft-font.c

@@ -978,6 +978,7 @@ _render_glyph_outline (FT_Face                    face,
 	    switch (font_options->subpixel_order) {
 	    case CAIRO_SUBPIXEL_ORDER_RGB:
 	    case CAIRO_SUBPIXEL_ORDER_BGR:
+	    case CAIRO_SUBPIXEL_ORDER_DEFAULT:
 	    default:
 		matrix.xx *= 3;
 		hmul = 3;
@@ -2204,6 +2205,9 @@ cairo_ft_font_options_substitute (const cairo_font_options_t *options,
 	    int hint_style;
 
 	    switch (options->hint_style) {
+	    case CAIRO_HINT_STYLE_NONE:
+		hint_style = FC_HINT_NONE;
+		break;
 	    case CAIRO_HINT_STYLE_SLIGHT:
 		hint_style = FC_HINT_SLIGHT;
 		break;
@@ -2211,6 +2215,7 @@ cairo_ft_font_options_substitute (const cairo_font_options_t *options,
 		hint_style = FC_HINT_MEDIUM;
 		break;
 	    case CAIRO_HINT_STYLE_FULL:
+	    case CAIRO_HINT_STYLE_DEFAULT:
 	    default:
 		hint_style = FC_HINT_FULL;
 		break;

src/cairo-image-surface.c

@@ -639,6 +639,12 @@ _cairo_image_surface_set_filter (cairo_image_surface_t *surface, cairo_filter_t
     case CAIRO_FILTER_BILINEAR:
 	pixman_filter = PIXMAN_FILTER_BILINEAR;
 	break;
+    case CAIRO_FILTER_GAUSSIAN:
+	/* XXX: The GAUSSIAN value has no implementation in cairo
+	 * whatsoever, so it was really a mistake to have it in the
+	 * API. We could fix this by officially deprecating it, or
+	 * else inventing semantics and providing an actual
+	 * implementation for it. */
     default:
 	pixman_filter = PIXMAN_FILTER_BEST;
     }
@@ -895,6 +901,9 @@ _cairo_image_surface_composite_trapezoids (cairo_operator_t	op,
 	mask_stride = (width + 31)/8;
 	mask_bpp = 1;
  	break;
+    case CAIRO_ANTIALIAS_GRAY:
+    case CAIRO_ANTIALIAS_SUBPIXEL:
+    case CAIRO_ANTIALIAS_DEFAULT:
     default:
 	format = pixman_format_create (PIXMAN_FORMAT_NAME_A8);
 	mask_stride = (width + 3) & ~3;

src/cairo-pattern.c

@@ -75,8 +75,8 @@ _cairo_pattern_nil_for_status (cairo_status_t status)
 	return &cairo_pattern_nil_file_not_found.base;
     case CAIRO_STATUS_READ_ERROR:
 	return &cairo_pattern_nil_read_error.base;
-    default:
     case CAIRO_STATUS_NO_MEMORY:
+    default:
 	return &cairo_pattern_nil.base;
     }
 }

src/cairo-pdf-surface.c

@@ -893,8 +893,12 @@ emit_surface_pattern (cairo_pdf_surface_t	*surface,
 	xstep = image->width;
 	ystep = image->height;
 	break;
+    /* All the reset should have been analyzed away, so this case
+     * should be unreachable. */
+    case CAIRO_EXTEND_REFLECT:
+    case CAIRO_EXTEND_PAD:
     default:
-	ASSERT_NOT_REACHED; /* all others should be analyzed away */
+	ASSERT_NOT_REACHED;
 	xstep = 0;
 	ystep = 0;
     }

src/cairo-xlib-surface.c

@@ -177,6 +177,8 @@ _CAIRO_FORMAT_DEPTH (cairo_format_t format)
 	return 1;
     case CAIRO_FORMAT_A8:
 	return 8;
+    case CAIRO_FORMAT_RGB16_565:
+	return 16;
     case CAIRO_FORMAT_RGB24:
 	return 24;
     case CAIRO_FORMAT_ARGB32:
@@ -963,6 +965,12 @@ _cairo_xlib_surface_set_filter (cairo_xlib_surface_t *surface,
     case CAIRO_FILTER_BILINEAR:
 	render_filter = FilterBilinear;
 	break;
+    case CAIRO_FILTER_GAUSSIAN:
+	/* XXX: The GAUSSIAN value has no implementation in cairo
+	 * whatsoever, so it was really a mistake to have it in the
+	 * API. We could fix this by officially deprecating it, or
+	 * else inventing semantics and providing an actual
+	 * implementation for it. */
     default:
 	render_filter = FilterBest;
 	break;
@@ -1372,6 +1380,7 @@ _cairo_xlib_surface_composite (cairo_operator_t		op,
 			dst_x, dst_y, width, height);
 	break;
 
+    case DO_UNSUPPORTED:
     default:
 	ASSERT_NOT_REACHED;
     }
@@ -1561,6 +1570,9 @@ _cairo_xlib_surface_composite_trapezoids (cairo_operator_t	op,
     case CAIRO_ANTIALIAS_NONE:
 	pict_format = XRenderFindStandardFormat (dst->dpy, PictStandardA1);
 	break;
+    case CAIRO_ANTIALIAS_GRAY:
+    case CAIRO_ANTIALIAS_SUBPIXEL:
+    case CAIRO_ANTIALIAS_DEFAULT:
     default:
 	pict_format = XRenderFindStandardFormat (dst->dpy, PictStandardA8);
 	break;