path: root/meta/packages/cairo/files/cairo-surface-cache-3.patch

diff --git a/src/cairo-clip.c b/src/cairo-clip.c
diff --git a/src/cairo-color.c b/src/cairo-color.c
index a348839..0688167 100644
--- a/src/cairo-color.c
+++ b/src/cairo-color.c
@@ -159,3 +159,10 @@ _cairo_color_get_rgba_premultiplied (cai
     *blue  = color->blue  * color->alpha;
     *alpha = color->alpha;
 }
+
+cairo_bool_t
+_cairo_color_equal (cairo_color_t *color_a,
+                    cairo_color_t *color_b)
+{
+    return (memcmp (color_a, color_b, sizeof (cairo_color_t)) == 0);
+}
diff --git a/src/cairo-directfb-surface.c b/src/cairo-directfb-surface.c
index 686510d..96ee212 100644
--- a/src/cairo-directfb-surface.c
+++ b/src/cairo-directfb-surface.c
@@ -1514,6 +1514,15 @@ _cairo_directfb_surface_show_glyphs ( vo
 }
 #endif /* DFB_SHOW_GLYPHS */
 
+static cairo_bool_t
+_cairo_directfb_surface_is_compatible (void *surface_a,
+                                       void *surface_b)
+{
+    cairo_directfb_surface_t *a = (cairo_directfb_surface_t*) surface_a;
+    cairo_directfb_surface_t *b = (cairo_directfb_surface_t*) surface_b;
+
+    return (a->dfb == b->dfb);
+}
 
 static cairo_surface_backend_t cairo_directfb_surface_backend = {
          CAIRO_SURFACE_TYPE_DIRECTFB, /*type*/
@@ -1564,7 +1573,8 @@ #if DFB_SHOW_GLYPHS
 #else
         NULL, /* show_glyphs */
 #endif
-        NULL /* snapshot */
+        NULL, /* snapshot */
+        _cairo_directfb_is_compatible
 };
 
 
diff --git a/src/cairo-ft-font.c b/src/cairo-ft-font.c
diff --git a/src/cairo-glitz-surface.c b/src/cairo-glitz-surface.c
index f492739..79e0162 100644
--- a/src/cairo-glitz-surface.c
+++ b/src/cairo-glitz-surface.c
@@ -1799,6 +1799,19 @@ _cairo_glitz_surface_scaled_glyph_fini (
     }
 }
 
+static cairo_bool_t
+_cairo_glitz_surface_is_compatible (void *surface_a,
+                                    void *surface_b)
+{
+    cairo_glitz_surface_t *a = (cairo_glitz_surface_t*) surface_a;
+    cairo_glitz_surface_t *b = (cairo_glitz_surface_t*) surface_b;
+
+    glitz_drawable *drawable_a = glitz_surface_get_drawable (a->surface);
+    glitz_drawable *drawable_b = glitz_surface_get_drawable (b->surface);
+
+    return (drawable_a == drawable_b);
+}
+
 #define FIXED_TO_FLOAT(f) (((glitz_float_t) (f)) / 65536)
 
 static cairo_status_t
@@ -2194,7 +2207,16 @@ static const cairo_surface_backend_t cai
     _cairo_glitz_surface_flush,
     NULL, /* mark_dirty_rectangle */
     _cairo_glitz_surface_scaled_font_fini,
-    _cairo_glitz_surface_scaled_glyph_fini
+    _cairo_glitz_surface_scaled_glyph_fini,
+
+    NULL, /* paint */
+    NULL, /* mask */
+    NULL, /* stroke */
+    NULL, /* fill */
+    NULL, /* show_glyphs */
+
+    NULL, /* snapshot */
+    _cairo_glitz_surface_is_compatible
 };
 
 static const cairo_surface_backend_t *
diff --git a/src/cairo-gstate.c b/src/cairo-gstate.c
diff --git a/src/cairo-meta-surface.c b/src/cairo-meta-surface.c
diff --git a/src/cairo-pattern.c b/src/cairo-pattern.c
index b488d1f..28f8561 100644
--- a/src/cairo-pattern.c
+++ b/src/cairo-pattern.c
@@ -1020,6 +1020,8 @@ _cairo_pattern_acquire_surface_for_gradi
     return status;
 }
 
+#define MAX_CACHE_SIZE 16
+
 static cairo_int_status_t
 _cairo_pattern_acquire_surface_for_solid (cairo_solid_pattern_t	     *pattern,
 					  cairo_surface_t	     *dst,
@@ -1030,12 +1032,59 @@ _cairo_pattern_acquire_surface_for_solid
 					  cairo_surface_t	     **out,
 					  cairo_surface_attributes_t *attribs)
 {
-    *out = _cairo_surface_create_similar_solid (dst,
-						CAIRO_CONTENT_COLOR_ALPHA,
-						1, 1,
-						&pattern->color);
-    if ((*out)->status)
-	return CAIRO_STATUS_NO_MEMORY;
+    /* We have a small cache here, because we don't want to constantly
+     * recreate surfaces for simple solid colors */
+    static struct {
+        cairo_color_t    color;
+        cairo_surface_t *surface;
+    } cache[MAX_CACHE_SIZE];
+    static int cache_size = 0;
+    static int i = 0;
+    CAIRO_MUTEX_DECLARE (cache_lock);
+
+    cairo_surface_t *surface;
+    cairo_status_t status;
+
+    CAIRO_MUTEX_LOCK (cache_lock);
+
+    /* Check cache first */
+    if (i < cache_size)
+        if (_cairo_color_equal (&cache[i].color, &pattern->color) &&
+            _cairo_surface_is_compatible (cache[i].surface, dst))
+            goto DONE;
+
+    for (i = 0; i < cache_size; i++)
+        if (_cairo_color_equal (&cache[i].color, &pattern->color) &&
+            _cairo_surface_is_compatible (cache[i].surface, dst))
+            goto DONE;
+
+    /* Not cached, need to create new */
+    surface = _cairo_surface_create_similar_solid (dst,
+						   CAIRO_CONTENT_COLOR_ALPHA,
+						   1, 1,
+						   &pattern->color);
+    if (surface->status) {
+        status = CAIRO_STATUS_NO_MEMORY;
+
+	goto UNLOCK;
+    }
+
+    /* Cache new */
+    if (cache_size < MAX_CACHE_SIZE)
+        cache_size++;
+    else {
+        i = rand () % MAX_CACHE_SIZE;
+
+        /* Evict old */
+        cairo_surface_destroy (cache[i].surface);
+    }
+
+    cache[i].color   = pattern->color;
+    cache[i].surface = surface;
+
+DONE:
+
+    *out = cairo_surface_reference (cache[i].surface);
 
     attribs->x_offset = attribs->y_offset = 0;
     cairo_matrix_init_identity (&attribs->matrix);
@@ -1043,7 +1092,13 @@ _cairo_pattern_acquire_surface_for_solid
     attribs->filter = CAIRO_FILTER_NEAREST;
     attribs->acquired = FALSE;
 
-    return CAIRO_STATUS_SUCCESS;
+    status = CAIRO_STATUS_SUCCESS;
+
+UNLOCK:
+
+    CAIRO_MUTEX_UNLOCK (cache_lock);
+
+    return status;
 }
 
 /**
diff --git a/src/cairo-scaled-font.c b/src/cairo-scaled-font.c
diff --git a/src/cairo-surface-fallback.c b/src/cairo-surface-fallback.c
diff --git a/src/cairo-surface.c b/src/cairo-surface.c
index 2bff0da..78cad9b 100644
--- a/src/cairo-surface.c
+++ b/src/cairo-surface.c
@@ -1078,6 +1078,32 @@ _cairo_surface_snapshot (cairo_surface_t
     return _cairo_surface_fallback_snapshot (surface);
 }
 
+/**
+ * _cairo_surface_is_compatible
+ * @surface_a: a #cairo_surface_t
+ * @surface_b: a #cairo_surface_t
+ *
+ * Find out whether the given surfaces share the same backend,
+ * and if so, whether they can be considered compatible.
+ *
+ * The definition of "compatible" depends on the backend. In the
+ * xlib case, it means the surfaces share the same display.
+ *
+ * Return value: TRUE if the surfaces are compatible.
+ **/
+cairo_bool_t
+_cairo_surface_is_compatible (cairo_surface_t *surface_a,
+                              cairo_surface_t *surface_b)
+{
+    if (surface_a->backend != surface_b->backend)
+        return FALSE;
+
+    if (surface_a->backend->is_compatible)
+        return surface_a->backend->is_compatible (surface_a, surface_b);
+
+    return TRUE;
+}
+
 cairo_status_t
 _cairo_surface_composite (cairo_operator_t	op,
 			  cairo_pattern_t	*src,
diff --git a/src/cairo-win32-surface.c b/src/cairo-win32-surface.c
index be7e706..81eb916 100644
--- a/src/cairo-win32-surface.c
+++ b/src/cairo-win32-surface.c
@@ -1609,6 +1609,16 @@ _cairo_win32_surface_show_glyphs (void		
     return (win_result) ? CAIRO_STATUS_SUCCESS : CAIRO_INT_STATUS_UNSUPPORTED;
 }
 
+static cairo_bool_t
+_cairo_win32_surface_is_compatible (void *surface_a,
+                                    void *surface_b)
+{
+    cairo_win32_surface_t *a = (cairo_win32_surface_t*) surface_a;
+    cairo_win32_surface_t *b = (cairo_win32_surface_t*) surface_b;
+
+    return (a->dc == b->dc);
+}
+
 #undef STACK_GLYPH_SIZE
 
 /**
@@ -1879,7 +1889,8 @@ static const cairo_surface_backend_t cai
     NULL, /* fill */
     _cairo_win32_surface_show_glyphs,
 
-    NULL  /* snapshot */
+    NULL, /* snapshot */
+    _cairo_win32_surface_is_compatible
 };
 
 /*
diff --git a/src/cairo-xcb-surface.c b/src/cairo-xcb-surface.c
index 2fdf8a1..8df859d 100644
--- a/src/cairo-xcb-surface.c
+++ b/src/cairo-xcb-surface.c
@@ -1578,6 +1578,10 @@ _cairo_xcb_surface_show_glyphs (void    
 				 int		      num_glyphs,
 				 cairo_scaled_font_t *scaled_font);
 
+static cairo_bool_t
+_cairo_xcb_surface_is_compatible (void *surface_a,
+                                  void *surface_b);
+
 /* XXX: move this to the bottom of the file, XCB and Xlib */
 
 static const cairo_surface_backend_t cairo_xcb_surface_backend = {
@@ -1609,7 +1613,8 @@ static const cairo_surface_backend_t cai
     NULL, /* stroke */
     NULL, /* fill */
     _cairo_xcb_surface_show_glyphs,
-    NULL  /* snapshot */
+    NULL, /* snapshot */
+    _cairo_xcb_surface_is_compatible
 };
 
 /**
@@ -2451,3 +2456,13 @@ _cairo_xcb_surface_show_glyphs (void    
 
     return status;
 }
+
+static cairo_bool_t
+_cairo_xcb_surface_is_compatible (void *surface_a,
+                                  void *surface_b)
+{
+    cairo_xcb_surface_t *a = (cairo_xcb_surface_t*) surface_a;
+    cairo_xcb_surface_t *b = (cairo_xcb_surface_t*) surface_b;
+
+    return (a->dpy == b->dpy);
+}
diff --git a/src/cairo-xlib-surface.c b/src/cairo-xlib-surface.c
index 6a0d3e4..9228c95 100644
--- a/src/cairo-xlib-surface.c
+++ b/src/cairo-xlib-surface.c
@@ -74,6 +74,10 @@ _cairo_xlib_surface_show_glyphs (void   
 				 int		      num_glyphs,
 				 cairo_scaled_font_t *scaled_font);
 
+static cairo_bool_t
+_cairo_xlib_surface_is_compatible (void *surface_a,
+                                   void *surface_b);
+
 /*
  * Instead of taking two round trips for each blending request,
  * assume that if a particular drawable fails GetImage that it will
@@ -1783,7 +1787,8 @@ static const cairo_surface_backend_t cai
     NULL, /* stroke */
     NULL, /* fill */
     _cairo_xlib_surface_show_glyphs,
-    NULL  /* snapshot */
+    NULL, /* snapshot */
+    _cairo_xlib_surface_is_compatible
 };
 
 /**
@@ -2913,3 +2918,13 @@ _cairo_xlib_surface_show_glyphs (void   
 
     return status;
 }
+
+static cairo_bool_t
+_cairo_xlib_surface_is_compatible (void *surface_a,
+                                   void *surface_b)
+{
+    cairo_xlib_surface_t *a = (cairo_xlib_surface_t*) surface_a;
+    cairo_xlib_surface_t *b = (cairo_xlib_surface_t*) surface_b;
+
+    return (a->dpy == b->dpy);
+}
diff --git a/src/cairo.c b/src/cairo.c
diff --git a/src/cairoint.h b/src/cairoint.h
index 060b988..01c0e2a 100755
--- a/src/cairoint.h
+++ b/src/cairoint.h
@@ -933,6 +933,10 @@ struct _cairo_surface_backend {
 
     cairo_surface_t *
     (*snapshot)			(void			*surface);
+
+    cairo_bool_t
+    (*is_compatible)            (void                   *surface_a,
+                                 void                   *surface_b);
 };
 
 typedef struct _cairo_format_masks {
@@ -1497,6 +1501,10 @@ _cairo_color_get_rgba_premultiplied (cai
 				     double	   *blue,
 				     double	   *alpha);
 
+cairo_private cairo_bool_t
+_cairo_color_equal (cairo_color_t *color_a,
+                    cairo_color_t *color_b);
+
 /* cairo-font.c */
 
 cairo_private void
@@ -1922,6 +1930,10 @@ _cairo_surface_clone_similar (cairo_surf
 cairo_private cairo_surface_t *
 _cairo_surface_snapshot (cairo_surface_t *surface);
 
+cairo_private cairo_bool_t
+_cairo_surface_is_compatible (cairo_surface_t *surface_a,
+                              cairo_surface_t *surface_b);
+
 cairo_private unsigned int
 _cairo_surface_get_current_clip_serial (cairo_surface_t *surface);