diff options
Diffstat (limited to 'src/display/sp-canvas.cpp')
| -rw-r--r-- | src/display/sp-canvas.cpp | 51 |
1 files changed, 47 insertions, 4 deletions
diff --git a/src/display/sp-canvas.cpp b/src/display/sp-canvas.cpp index 84bdfb762..196a14069 100644 --- a/src/display/sp-canvas.cpp +++ b/src/display/sp-canvas.cpp @@ -966,6 +966,9 @@ static void sp_canvas_init(SPCanvas *canvas) canvas->_drawing_disabled = false; canvas->_backing_store = NULL; +#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 12, 0) + canvas->_surface_for_similar = NULL; +#endif canvas->_clean_region = cairo_region_create(); canvas->_background = cairo_pattern_create_rgb(1, 1, 1); canvas->_background_is_checkerboard = false; @@ -1003,6 +1006,12 @@ void SPCanvas::dispose(GObject *object) cairo_surface_destroy(canvas->_backing_store); canvas->_backing_store = NULL; } +#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 12, 0) + if (canvas->_surface_for_similar) { + cairo_surface_destroy(canvas->_surface_for_similar); + canvas->_surface_for_similar = NULL; + } +#endif if (canvas->_clean_region) { cairo_region_destroy(canvas->_clean_region); canvas->_clean_region = NULL; @@ -1125,8 +1134,14 @@ void SPCanvas::handle_size_allocate(GtkWidget *widget, GtkAllocation *allocation allocation->width, allocation->height); // resize backing store - cairo_surface_t *new_backing_store = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, - allocation->width, allocation->height); + cairo_surface_t *new_backing_store = NULL; +#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 12, 0) + if (canvas->_surface_for_similar != NULL) + new_backing_store = cairo_surface_create_similar_image(canvas->_surface_for_similar, + CAIRO_FORMAT_ARGB32, allocation->width, allocation->height); +#endif + if (new_backing_store == NULL) + new_backing_store = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, allocation->width, allocation->height); if (canvas->_backing_store) { cairo_t *cr = cairo_create(new_backing_store); cairo_translate(cr, -canvas->_x0, -canvas->_y0); @@ -1764,6 +1779,28 @@ void SPCanvas::endForcedFullRedraws() gboolean SPCanvas::handle_draw(GtkWidget *widget, cairo_t *cr) { SPCanvas *canvas = SP_CANVAS(widget); +#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 12, 0) + if (canvas->_surface_for_similar == NULL && canvas->_backing_store != NULL) { + canvas->_surface_for_similar = cairo_surface_create_similar( + cairo_get_target(cr), CAIRO_CONTENT_COLOR_ALPHA, 1, 1); + + // Reallocate backing store so that cairo can use shared memory + cairo_surface_t *new_backing_store = cairo_surface_create_similar_image( + canvas->_surface_for_similar, CAIRO_FORMAT_ARGB32, + cairo_image_surface_get_width(canvas->_backing_store), + cairo_image_surface_get_height(canvas->_backing_store)); + + // Copy the old backing store contents + cairo_t *cr = cairo_create(new_backing_store); + cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); + cairo_set_source_surface(cr, canvas->_backing_store, 0, 0); + cairo_paint(cr); + cairo_destroy(cr); + cairo_surface_destroy(canvas->_backing_store); + canvas->_backing_store = new_backing_store; + } +#endif + // Blit from the backing store, without regard for the clean region. // This is necessary because GTK clears the widget for us, which causes // severe flicker while drawing if we don't blit the old contents. @@ -1949,8 +1986,14 @@ void SPCanvas::scrollTo( Geom::Point const &c, unsigned int clear, bool is_scrol // adjust backing store contents assert(_backing_store); - cairo_surface_t *new_backing_store = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, - allocation.width, allocation.height); + cairo_surface_t *new_backing_store = NULL; +#if CAIRO_VERSION >= CAIRO_VERSION_ENCODE(1, 12, 0) + if (_surface_for_similar != NULL) + new_backing_store = cairo_surface_create_similar_image( + _surface_for_similar, CAIRO_FORMAT_ARGB32, allocation.width, allocation.height); +#endif + if (new_backing_store == NULL) + new_backing_store = cairo_image_surface_create(CAIRO_FORMAT_ARGB32, allocation.width, allocation.height); cairo_t *cr = cairo_create(new_backing_store); cairo_set_operator(cr, CAIRO_OPERATOR_SOURCE); // Paint the background |