st-theme-node: Improve borders with gradient backgrounds
For gradient backgrounds, borders were implemented by filling the background shape with the border color first, and then scaling down the path to draw the background. The result is not correct[0], which is especially visible if the border width is greater than the border radius - so instead of scaling down the original path, use a separate path for the background. The result is consistent with the borders we draw for non-gradient backgrounds, and much closer to the correct standard behavior. [0] http://www.w3.org/TR/css3-background/#the-border-radius https://bugzilla.gnome.org/show_bug.cgi?id=607500
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@ -378,7 +378,6 @@ st_theme_node_render_gradient (StThemeNode *node)
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cairo_t *cr;
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cairo_surface_t *surface;
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cairo_pattern_t *pattern;
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gboolean round_border = FALSE;
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ClutterColor border_color;
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int border_width;
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guint rowstride;
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@ -397,11 +396,7 @@ st_theme_node_render_gradient (StThemeNode *node)
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get_arbitrary_border (node, &border_width, &border_color);
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for (i = 0; i < 4; i++)
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{
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radius[i] = st_theme_node_get_border_radius (node, i);
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if (radius[i] > 0)
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round_border = TRUE;
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}
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if (node->background_gradient_type == ST_GRADIENT_VERTICAL)
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pattern = cairo_pattern_create_linear (0, 0, 0, node->alloc_height);
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@ -427,8 +422,7 @@ st_theme_node_render_gradient (StThemeNode *node)
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node->background_gradient_end.blue / 255.,
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node->background_gradient_end.alpha / 255.);
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if (round_border)
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{
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/* Create a path for the background's outline first */
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if (radius[ST_CORNER_TOPLEFT] > 0)
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cairo_arc (cr,
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radius[ST_CORNER_TOPLEFT],
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@ -455,15 +449,15 @@ st_theme_node_render_gradient (StThemeNode *node)
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node->alloc_height - radius[ST_CORNER_BOTTOMLEFT],
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radius[ST_CORNER_BOTTOMLEFT], M_PI / 2, M_PI);
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cairo_close_path (cr);
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}
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else
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cairo_rectangle (cr, 0, 0, node->alloc_width, node->alloc_height);
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/* If we have a border, we fill the outline with the border
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* color and create the inline shape for the background gradient;
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* otherwise the outline shape is filled with the background
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* gradient directly
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*/
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if (border_width > 0)
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{
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cairo_path_t *path;
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path = cairo_copy_path (cr);
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cairo_set_source_rgba (cr,
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border_color.red / 255.,
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border_color.green / 255.,
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@ -471,12 +465,48 @@ st_theme_node_render_gradient (StThemeNode *node)
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border_color.alpha / 255.);
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cairo_fill (cr);
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cairo_translate (cr, border_width, border_width);
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cairo_scale (cr,
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(gdouble)(node->alloc_width - 2 * border_width) / node->alloc_width,
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(gdouble)(node->alloc_height - 2 * border_width) / node->alloc_height);
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cairo_append_path (cr, path);
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cairo_path_destroy (path);
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if (radius[ST_CORNER_TOPLEFT] > border_width)
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cairo_arc (cr,
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radius[ST_CORNER_TOPLEFT],
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radius[ST_CORNER_TOPLEFT],
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radius[ST_CORNER_TOPLEFT] - border_width,
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M_PI, 3 * M_PI / 2);
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else
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cairo_move_to (cr, border_width, border_width);
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cairo_line_to (cr,
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node->alloc_width - MAX(radius[ST_CORNER_TOPRIGHT], border_width),
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border_width);
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if (radius[ST_CORNER_TOPRIGHT] > border_width)
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cairo_arc (cr,
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node->alloc_width - radius[ST_CORNER_TOPRIGHT],
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radius[ST_CORNER_TOPRIGHT],
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radius[ST_CORNER_TOPRIGHT] - border_width,
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3 * M_PI / 2, 2 * M_PI);
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cairo_line_to (cr,
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node->alloc_width - border_width,
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node->alloc_height - MAX(radius[ST_CORNER_BOTTOMRIGHT], border_width));
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if (radius[ST_CORNER_BOTTOMRIGHT] > border_width)
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cairo_arc (cr,
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node->alloc_width - radius[ST_CORNER_BOTTOMRIGHT],
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node->alloc_height - radius[ST_CORNER_BOTTOMRIGHT],
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radius[ST_CORNER_BOTTOMRIGHT] - border_width,
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0, M_PI / 2);
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cairo_line_to (cr,
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MAX(radius[ST_CORNER_BOTTOMLEFT], border_width),
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node->alloc_height - border_width);
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if (radius[ST_CORNER_BOTTOMLEFT] > border_width)
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cairo_arc (cr,
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radius[ST_CORNER_BOTTOMLEFT],
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node->alloc_height - radius[ST_CORNER_BOTTOMLEFT],
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radius[ST_CORNER_BOTTOMLEFT] - border_width,
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M_PI / 2, M_PI);
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cairo_close_path (cr);
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}
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cairo_set_source (cr, pattern);
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