From e03e93fd1bb6f347b13d42796c1f0dada4ca8bb5 Mon Sep 17 00:00:00 2001 From: Michael Stapelberg Date: Sat, 2 Apr 2011 19:49:38 +0200 Subject: [PATCH] optimization: render to pixmap which is used as background for the window MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Before this commit, the background color (white by default) was visible for about 100ms until the image was drawn. This flickering is now eliminated. Also, we don’t need to handle Expose-events anymore, as X11 will use the window’s background pixmap automatically. --- i3lock.c | 79 +++++++++++++++++++++----------------------------------- xcb.c | 27 ++++++++++++++++--- xcb.h | 3 ++- 3 files changed, 56 insertions(+), 53 deletions(-) diff --git a/i3lock.c b/i3lock.c index 27144cb..a32d5b5 100644 --- a/i3lock.c +++ b/i3lock.c @@ -48,7 +48,6 @@ static bool beep = false; #ifndef NOLIBCAIRO static cairo_surface_t *img = NULL; -static cairo_t *ctx = NULL; static bool tile = false; #endif @@ -71,31 +70,6 @@ static void input_done() { } } -/* - * Called when we should draw the image (if any). - * - */ -static void handle_expose_event() { -#ifndef NOLIBCAIRO - if (!ctx) - return; - - if (tile) { - /* create a pattern and fill a rectangle as big as the screen */ - cairo_pattern_t *pattern; - pattern = cairo_pattern_create_for_surface(img); - cairo_set_source(ctx, pattern); - cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT); - cairo_rectangle(ctx, 0, 0, scr->width_in_pixels, scr->height_in_pixels); - cairo_fill(ctx); - } else { - /* otherwise, just paint the image */ - cairo_paint(ctx); - } -#endif - xcb_flush(conn); -} - /* * Called when the user releases a key. We need to leave the Mode_switch * state when the user releases the Mode_switch key. @@ -388,36 +362,48 @@ int main(int argc, char *argv[]) { scr = xcb_setup_roots_iterator(xcb_get_setup(conn)).data; vistype = get_root_visual_type(scr); - /* open the fullscreen window and flush immediately afterwards so that X11 - * can generate an expose event while we load the PNG file (so that we are - * ready to handle the expose event immediately afterwards) */ - win = open_fullscreen_window(conn, scr, color); - - cursor = create_cursor(conn, scr, win, curs_choice); - - grab_pointer_and_keyboard(conn, scr, cursor); - - symbols = xcb_key_symbols_alloc(conn); - modeswitchmask = get_mod_mask(conn, symbols, XK_Mode_switch); - numlockmask = get_mod_mask(conn, symbols, XK_Num_Lock); + /* Pixmap on which the image is rendered to (if any) */ + xcb_pixmap_t bg_pixmap = XCB_NONE; #ifndef NOLIBCAIRO - if (image_path) + if (image_path) { + bg_pixmap = create_bg_pixmap(conn, scr, color); + /* Create a pixmap to render on, fill it with the background color */ img = cairo_image_surface_create_from_png(image_path); + } if (img) { /* Initialize cairo */ cairo_surface_t *output; - output = cairo_xcb_surface_create(conn, win, vistype, + output = cairo_xcb_surface_create(conn, bg_pixmap, vistype, scr->width_in_pixels, scr->height_in_pixels); - ctx = cairo_create(output); - if (!tile) + cairo_t *ctx = cairo_create(output); + if (!tile) { cairo_set_source_surface(ctx, img, 0, 0); - - handle_expose_event(); + cairo_paint(ctx); + } else { + /* create a pattern and fill a rectangle as big as the screen */ + cairo_pattern_t *pattern; + pattern = cairo_pattern_create_for_surface(img); + cairo_set_source(ctx, pattern); + cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT); + cairo_rectangle(ctx, 0, 0, scr->width_in_pixels, scr->height_in_pixels); + cairo_fill(ctx); + } } #endif + /* open the fullscreen window, already with the correct pixmap in place */ + win = open_fullscreen_window(conn, scr, color, bg_pixmap); + + cursor = create_cursor(conn, scr, win, curs_choice); + + grab_pointer_and_keyboard(conn, scr, cursor); + + symbols = xcb_key_symbols_alloc(conn); + modeswitchmask = get_mod_mask(conn, symbols, XK_Mode_switch); + numlockmask = get_mod_mask(conn, symbols, XK_Num_Lock); + if (dpms) dpms_turn_off_screen(conn); @@ -428,11 +414,6 @@ int main(int argc, char *argv[]) { /* Strip off the highest bit (set if the event is generated) */ int type = (event->response_type & 0x7F); - if (type == XCB_EXPOSE) { - handle_expose_event(); - continue; - } - if (type == XCB_KEY_PRESS) { handle_key_press((xcb_key_press_event_t*)event); continue; diff --git a/xcb.c b/xcb.c index 32077e1..818bf75 100644 --- a/xcb.c +++ b/xcb.c @@ -78,13 +78,34 @@ xcb_visualtype_t *get_root_visual_type(xcb_screen_t *screen) { return NULL; } -xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color) { +xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, char *color) { + xcb_pixmap_t bg_pixmap = xcb_generate_id(conn); + xcb_create_pixmap(conn, scr->root_depth, bg_pixmap, scr->root, + scr->width_in_pixels, scr->height_in_pixels); + + /* Generate a Graphics Context and fill the pixmap with background color + * (for images that are smaller than your screen) */ + xcb_gcontext_t gc = xcb_generate_id(conn); + uint32_t values[] = { get_colorpixel(color) }; + xcb_create_gc(conn, gc, bg_pixmap, XCB_GC_FOREGROUND, values); + xcb_rectangle_t rect = { 0, 0, scr->width_in_pixels, scr->height_in_pixels }; + xcb_poly_fill_rectangle(conn, bg_pixmap, gc, 1, &rect); + + return bg_pixmap; +} + +xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap) { uint32_t mask = 0; uint32_t values[3]; xcb_window_t win = xcb_generate_id(conn); - mask |= XCB_CW_BACK_PIXEL; - values[0] = get_colorpixel(color); + if (pixmap == XCB_NONE) { + mask |= XCB_CW_BACK_PIXEL; + values[0] = get_colorpixel(color); + } else { + mask |= XCB_CW_BACK_PIXMAP; + values[0] = pixmap; + } mask |= XCB_CW_OVERRIDE_REDIRECT; values[1] = 1; diff --git a/xcb.h b/xcb.h index bae51b2..3c6469e 100644 --- a/xcb.h +++ b/xcb.h @@ -4,7 +4,8 @@ #include xcb_visualtype_t *get_root_visual_type(xcb_screen_t *s); -xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color); +xcb_pixmap_t create_bg_pixmap(xcb_connection_t *conn, xcb_screen_t *scr, char *color); +xcb_window_t open_fullscreen_window(xcb_connection_t *conn, xcb_screen_t *scr, char *color, xcb_pixmap_t pixmap); void grab_pointer_and_keyboard(xcb_connection_t *conn, xcb_screen_t *screen, xcb_cursor_t cursor); uint32_t get_mod_mask(xcb_connection_t *conn, xcb_key_symbols_t *symbols, uint32_t keycode); void dpms_turn_off_screen(xcb_connection_t *conn);