15-bit color is all my poor video hardware can handle. Please don't drop support for this!

BTW, I'm using version 1.4.10, but this wasn't an option in bugzilla.

Here's the patch that fixed it for me:

diff --git a/src/cairo-image-surface.c b/src/cairo-image-surface.c
index ad41a4c..14c4b7c 100644
--- a/src/cairo-image-surface.c
+++ b/src/cairo-image-surface.c
@@ -168,6 +168,11 @@ _cairo_format_from_pixman_format (pixman_format_t *pixman_format)
 	    gm == 0x07e0 &&
 	    bm == 0x001f)
 	    return CAIRO_INTERNAL_FORMAT_RGB16_565;
+	if (am == 0x0 &&
+	    rm == 0x7c00 &&
+	    gm == 0x03e0 &&
+	    bm == 0x001f)
+	    return CAIRO_INTERNAL_FORMAT_RGB15;
 	break;
     case 8:
 	if (am == 0xff &&
@@ -561,6 +566,7 @@ _cairo_content_from_format (cairo_format_t format)
 	return CAIRO_CONTENT_COLOR_ALPHA;
     case CAIRO_FORMAT_RGB24:
     case CAIRO_INTERNAL_FORMAT_RGB16_565:
+    case CAIRO_INTERNAL_FORMAT_RGB15:
     case CAIRO_INTERNAL_FORMAT_BGR24:
 	return CAIRO_CONTENT_COLOR;
     case CAIRO_FORMAT_A8:
diff --git a/src/cairoint.h b/src/cairoint.h
index 07846b8..5bf6212 100644
--- a/src/cairoint.h
+++ b/src/cairoint.h
@@ -344,7 +344,8 @@ typedef enum cairo_internal_surface_type {
 typedef enum cairo_internal_format {
     CAIRO_INTERNAL_FORMAT_ABGR32 = 0x1000,
     CAIRO_INTERNAL_FORMAT_BGR24,
-    CAIRO_INTERNAL_FORMAT_RGB16_565
+    CAIRO_INTERNAL_FORMAT_RGB16_565,
+    CAIRO_INTERNAL_FORMAT_RGB15
 } cairo_internal_format_t;
 
 typedef enum cairo_direction {