forked from AuroraMiddleware/gtk
cssshadowvalue: Add a cache for blurred Pango layouts
Drawing text with Pango is quite expensive, and drawing text and also blurring it is *really* expensive. To prevent us from drawing a lot of text and then blurring it a lot is *really* expensive. We now cache the blurred pixels for the last layout and shadow we made, which means we can repeatedly draw labels with a blurred text-shadow extremely fast. To detect whether the shadow is up-to-date, we track the serial of the PangoLayout alongside the radius of the box shadow. We don't support inset shadows nor spread on text-shadow, so we don't need to track these.
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@ -386,6 +386,92 @@ gtk_css_shadow_value_finish_drawing (const GtkCssValue *shadow,
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return original_cr;
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}
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static const cairo_user_data_key_t radius_key;
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static const cairo_user_data_key_t layout_serial_key;
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G_DEFINE_QUARK (GtkCssShadowValue pango_cached_blurred_surface, pango_cached_blurred_surface)
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static cairo_surface_t *
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get_cached_pango_surface (PangoLayout *layout,
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const GtkCssValue *shadow)
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{
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cairo_surface_t *cached_surface = g_object_get_qdata (G_OBJECT (layout), pango_cached_blurred_surface_quark ());
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guint cached_radius, cached_serial;
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guint radius, serial;
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if (!cached_surface)
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return NULL;
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radius = _gtk_css_number_value_get (shadow->radius, 0);
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cached_radius = GPOINTER_TO_UINT (cairo_surface_get_user_data (cached_surface, &radius_key));
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if (radius != cached_radius)
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return NULL;
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serial = pango_layout_get_serial (layout);
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cached_serial = GPOINTER_TO_UINT (cairo_surface_get_user_data (cached_surface, &layout_serial_key));
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if (serial != cached_serial)
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return NULL;
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return cached_surface;
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}
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static cairo_surface_t *
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make_blurred_pango_surface (cairo_t *existing_cr,
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PangoLayout *layout,
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const GtkCssValue *shadow)
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{
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cairo_surface_t *surface;
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cairo_t *cr;
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gdouble radius, clip_radius;
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PangoRectangle ink_rect;
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radius = _gtk_css_number_value_get (shadow->radius, 0);
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pango_layout_get_pixel_extents (layout, &ink_rect, NULL);
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clip_radius = _gtk_cairo_blur_compute_pixels (radius);
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surface = cairo_surface_create_similar_image (cairo_get_target (existing_cr),
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CAIRO_FORMAT_A8,
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ink_rect.width + 2 * clip_radius,
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ink_rect.height + 2 * clip_radius);
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cairo_surface_set_device_offset (surface, -ink_rect.x + clip_radius, -ink_rect.y + clip_radius);
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cr = cairo_create (surface);
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cairo_move_to (cr, 0, 0);
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_gtk_pango_fill_layout (cr, layout);
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_gtk_cairo_blur_surface (surface, radius);
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cairo_destroy (cr);
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return surface;
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}
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static cairo_surface_t *
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get_blurred_pango_surface (cairo_t *cr,
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PangoLayout *layout,
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const GtkCssValue *shadow)
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{
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cairo_surface_t *surface;
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guint radius, serial;
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surface = get_cached_pango_surface (layout, shadow);
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if (!surface)
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{
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surface = make_blurred_pango_surface (cr, layout, shadow);
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/* Cache the surface on the PangoLayout */
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radius = _gtk_css_number_value_get (shadow->radius, 0);
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cairo_surface_set_user_data (surface, &radius_key, GUINT_TO_POINTER (radius), NULL);
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serial = pango_layout_get_serial (layout);
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cairo_surface_set_user_data (surface, &layout_serial_key, GUINT_TO_POINTER (serial), NULL);
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g_object_set_qdata_full (G_OBJECT (layout), pango_cached_blurred_surface_quark (),
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surface, (GDestroyNotify) cairo_surface_destroy);
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}
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return surface;
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}
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void
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_gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
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cairo_t *cr,
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@ -398,20 +484,32 @@ _gtk_css_shadow_value_paint_layout (const GtkCssValue *shadow,
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cairo_save (cr);
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cairo_rel_move_to (cr,
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if (needs_blur (shadow))
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{
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cairo_surface_t *blurred_surface = get_blurred_pango_surface (cr, layout, shadow);
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double x, y;
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cairo_get_current_point (cr, &x, &y);
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cairo_translate (cr, x, y);
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cairo_translate (cr,
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_gtk_css_number_value_get (shadow->hoffset, 0),
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_gtk_css_number_value_get (shadow->voffset, 0));
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gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
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cr = gtk_css_shadow_value_start_drawing (shadow, cr);
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cairo_mask_surface (cr, blurred_surface, 0, 0);
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}
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else
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{
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/* The no blur case -- just paint directly. */
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cairo_rel_move_to (cr,
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_gtk_css_number_value_get (shadow->hoffset, 0),
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_gtk_css_number_value_get (shadow->voffset, 0));
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gdk_cairo_set_source_rgba (cr, _gtk_css_rgba_value_get_rgba (shadow->color));
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_gtk_pango_fill_layout (cr, layout);
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cr = gtk_css_shadow_value_finish_drawing (shadow, cr);
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cairo_rel_move_to (cr,
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- _gtk_css_number_value_get (shadow->hoffset, 0),
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- _gtk_css_number_value_get (shadow->voffset, 0));
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}
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cairo_restore (cr);
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}
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