Remove conditional compilation for cairo/pangocairo (#2480)

We strive to avoid conditional compilation in i3 as much as possible.
cairo and pangocairo have been around long enough in the versions that
we need that it’s time to unconditionally depend on them.

Also update DEPENDS with the last-known-good-versions while at it.

libi3/draw_util.c

@@ -11,9 +11,7 @@
 #include <string.h>
 #include <xcb/xcb.h>
 #include <xcb/xcb_aux.h>
-#if CAIRO_SUPPORT
 #include <cairo/cairo-xcb.h>
-#endif
 
 #include "libi3.h"
 
@@ -50,10 +48,8 @@ void draw_util_surface_init(xcb_connection_t *conn, surface_t *surface, xcb_draw
         ELOG("Could not create graphical context. Error code: %d. Please report this bug.\n", error->error_code);
     }
 
-#if CAIRO_SUPPORT
     surface->surface = cairo_xcb_surface_create(conn, surface->id, surface->visual_type, width, height);
     surface->cr = cairo_create(surface->surface);
-#endif
 }
 
 /*
@@ -62,7 +58,6 @@ void draw_util_surface_init(xcb_connection_t *conn, surface_t *surface, xcb_draw
  */
 void draw_util_surface_free(xcb_connection_t *conn, surface_t *surface) {
     xcb_free_gc(conn, surface->gc);
-#if CAIRO_SUPPORT
     cairo_surface_destroy(surface->surface);
     cairo_destroy(surface->cr);
 
@@ -71,7 +66,6 @@ void draw_util_surface_free(xcb_connection_t *conn, surface_t *surface) {
      * when setting the border of a window to none and then closing it. */
     surface->surface = NULL;
     surface->cr = NULL;
-#endif
 }
 
 /*
@@ -81,9 +75,7 @@ void draw_util_surface_free(xcb_connection_t *conn, surface_t *surface) {
 void draw_util_surface_set_size(surface_t *surface, int width, int height) {
     surface->width = width;
     surface->height = height;
-#if CAIRO_SUPPORT
     cairo_xcb_surface_set_size(surface->surface, width, height);
-#endif
 }
 
 /*
@@ -121,13 +113,7 @@ color_t draw_util_hex_to_color(const char *color) {
 static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surface, color_t color) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#if CAIRO_SUPPORT
     cairo_set_source_rgba(surface->cr, color.red, color.green, color.blue, color.alpha);
-#else
-    uint32_t colorpixel = color.colorpixel;
-    xcb_change_gc(conn, surface->gc, XCB_GC_FOREGROUND | XCB_GC_BACKGROUND,
-                  (uint32_t[]){colorpixel, colorpixel});
-#endif
 }
 
 /**
@@ -139,18 +125,14 @@ static void draw_util_set_source_color(xcb_connection_t *conn, surface_t *surfac
 void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_t bg_color, int x, int y, int max_width) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#if CAIRO_SUPPORT
     /* Flush any changes before we draw the text as this might use XCB directly. */
     CAIRO_SURFACE_FLUSH(surface->surface);
-#endif
 
     set_font_colors(surface->gc, fg_color, bg_color);
     draw_text(text, surface->id, surface->gc, surface->visual_type, x, y, max_width);
 
-#if CAIRO_SUPPORT
     /* Notify cairo that we (possibly) used another way to draw on the surface. */
     cairo_surface_mark_dirty(surface->surface);
-#endif
 }
 
 /**
@@ -162,7 +144,6 @@ void draw_util_text(i3String *text, surface_t *surface, color_t fg_color, color_
 void draw_util_rectangle(xcb_connection_t *conn, surface_t *surface, color_t color, double x, double y, double w, double h) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#if CAIRO_SUPPORT
     cairo_save(surface->cr);
 
     /* Using the SOURCE operator will copy both color and alpha information directly
@@ -179,12 +160,6 @@ void draw_util_rectangle(xcb_connection_t *conn, surface_t *surface, color_t col
     CAIRO_SURFACE_FLUSH(surface->surface);
 
     cairo_restore(surface->cr);
-#else
-    draw_util_set_source_color(conn, surface, color);
-
-    xcb_rectangle_t rect = {x, y, w, h};
-    xcb_poly_fill_rectangle(conn, surface->id, surface->gc, 1, &rect);
-#endif
 }
 
 /**
@@ -194,7 +169,6 @@ void draw_util_rectangle(xcb_connection_t *conn, surface_t *surface, color_t col
 void draw_util_clear_surface(xcb_connection_t *conn, surface_t *surface, color_t color) {
     RETURN_UNLESS_SURFACE_INITIALIZED(surface);
 
-#if CAIRO_SUPPORT
     cairo_save(surface->cr);
 
     /* Using the SOURCE operator will copy both color and alpha information directly
@@ -210,12 +184,6 @@ void draw_util_clear_surface(xcb_connection_t *conn, surface_t *surface, color_t
     CAIRO_SURFACE_FLUSH(surface->surface);
 
     cairo_restore(surface->cr);
-#else
-    draw_util_set_source_color(conn, surface, color);
-
-    xcb_rectangle_t rect = {0, 0, surface->width, surface->height};
-    xcb_poly_fill_rectangle(conn, surface->id, surface->gc, 1, &rect);
-#endif
 }
 
 /**
@@ -227,7 +195,6 @@ void draw_util_copy_surface(xcb_connection_t *conn, surface_t *src, surface_t *d
     RETURN_UNLESS_SURFACE_INITIALIZED(src);
     RETURN_UNLESS_SURFACE_INITIALIZED(dest);
 
-#if CAIRO_SUPPORT
     cairo_save(dest->cr);
 
     /* Using the SOURCE operator will copy both color and alpha information directly
@@ -245,8 +212,4 @@ void draw_util_copy_surface(xcb_connection_t *conn, surface_t *src, surface_t *d
     CAIRO_SURFACE_FLUSH(dest->surface);
 
     cairo_restore(dest->cr);
-#else
-    xcb_copy_area(conn, src->id, dest->id, dest->gc, (int16_t)src_x, (int16_t)src_y,
-                  (int16_t)dest_x, (int16_t)dest_y, (uint16_t)width, (uint16_t)height);
-#endif
 }