Add choice of display to --image.

Additionally
  - Made background colors display when an image is enabled if
a --color is specified.
  - Link CJson to swaylock.
  - Add the --socket option to swaylock.

3 files changed, 132 insertions, 37 deletions

diff --git a/swaylock/CMakeLists.txt b/swaylock/CMakeLists.txt
index 08c893ca..b290cd2f 100644
--- a/swaylock/CMakeLists.txt
+++ b/swaylock/CMakeLists.txt
@@ -4,6 +4,7 @@ include_directories(
         ${CAIRO_INCLUDE_DIRS}
         ${PANGO_INCLUDE_DIRS}
         ${PAM_INCLUDE_DIRS}
+        ${JSONC_INCLUDE_DIRS}
 )
 
 add_executable(swaylock
@@ -18,6 +19,7 @@ target_link_libraries(swaylock
         ${CAIRO_LIBRARIES}
         ${PANGO_LIBRARIES}
         ${PAM_LIBRARIES}
+        ${JSONC_LIBRARIES}
         m
 )
 
diff --git a/swaylock/main.c b/swaylock/main.c
index feb64975..7f4c424d 100644
--- a/swaylock/main.c
+++ b/swaylock/main.c
@@ -2,6 +2,7 @@
 #include <xkbcommon/xkbcommon.h>
 #include <xkbcommon/xkbcommon-names.h>
 #include <security/pam_appl.h>
+#include <json-c/json.h>
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
@@ -11,6 +12,7 @@
 #include "client/window.h"
 #include "client/registry.h"
 #include "client/cairo.h"
+#include "ipc-client.h"
 #include "log.h"
 
 list_t *surfaces;
@@ -134,7 +136,6 @@ void notify_key(enum wl_keyboard_key_state state, xkb_keysym_t sym, uint32_t cod
 void render_color(struct window *window, uint32_t color) {
         cairo_set_source_u32(window->cairo, color);
         cairo_paint(window->cairo);
-        window_render(window);
 }
 
 void render_image(struct window *window, cairo_surface_t *image, enum scaling_mode scaling_mode) {
@@ -203,14 +204,35 @@ void render_image(struct window *window, cairo_surface_t *image, enum scaling_mo
         }
 
         cairo_paint(window->cairo);
+}
+
+cairo_surface_t *load_image(char *image_path) {
+        cairo_surface_t *image = NULL;
+
+#ifdef WITH_GDK_PIXBUF
+        GError *err = NULL;
+        GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(image_path, &err);
+        if (!pixbuf) {
+                fprintf(stderr, "GDK Error: %s\n", err->message);
+                sway_abort("Failed to load background image.");
+        }
+        image = gdk_cairo_image_surface_create_from_pixbuf(pixbuf);
+        g_object_unref(pixbuf);
+#else
+        image = cairo_image_surface_create_from_png(image_path);
+#endif //WITH_GDK_PIXBUF
+        if (!image) {
+                sway_abort("Failed to read background image.");
+        }
 
-        window_render(window);
+        return image;
 }
 
 int main(int argc, char **argv) {
-        char *image_path = NULL;
-        char *scaling_mode_str = "fit";
+        char *scaling_mode_str = "fit", *socket_path = NULL;
+        int i, num_images = 0, color_set = 0;
         uint32_t color = 0xFFFFFFFF;
+        void *images;
 
         init_log(L_INFO);
 
@@ -221,18 +243,22 @@ int main(int argc, char **argv) {
                 {"scaling", required_argument, NULL, 's'},
                 {"tiling", no_argument, NULL, 't'},
                 {"version", no_argument, NULL, 'v'},
+                {"socket", required_argument, NULL, 'p'},
                 {0, 0, 0, 0}
         };
 
         const char *usage =
                 "Usage: swaylock [options...]\n"
                 "\n"
-                "  -h, --help                 Show help message and quit.\n"
-                "  -c, --color <rrggbb[aa]>   Turn the screen into the given color instead of white.\n"
-                "  -s, --scaling              Scaling mode: stretch, fill, fit, center, tile.\n"
-                "  -t, --tiling               Same as --scaling=tile.\n"
-                "  -v, --version              Show the version number and quit.\n"
-                "  -i, --image <path>         Display the given image.\n";
+                "  -h, --help                      Show help message and quit.\n"
+                "  -c, --color <rrggbb[aa]>        Turn the screen into the given color instead of white.\n"
+                "  -s, --scaling                   Scaling mode: stretch, fill, fit, center, tile.\n"
+                "  -t, --tiling                    Same as --scaling=tile.\n"
+                "  -v, --version                   Show the version number and quit.\n"
+                "  -i, --image [<display>:]<path>  Display the given image.\n"
+                "  --socket <socket>               Use the specified socket.\n";
+
+        registry = registry_poll();
 
         int c;
         while (1) {
@@ -250,6 +276,7 @@ int main(int argc, char **argv) {
                                 exit(EXIT_FAILURE);
                         }
                         color = strtol(optarg, NULL, 16);
+                        color_set = 1;
 
                         if (colorlen == 6) {
                                 color <<= 8;
@@ -259,14 +286,39 @@ int main(int argc, char **argv) {
                         break;
                 }
                 case 'i':
-                        image_path = optarg;
+                {
+                        char *image_path = strchr(optarg, ':');
+                        if (image_path == NULL) {
+                                if (num_images == 0) {
+                                        images = load_image(optarg);
+                                        num_images = -1;
+                                } else {
+                                        fprintf(stderr, "display must be defined for all --images or no --images.\n");
+                                        exit(EXIT_FAILURE);
+                                }
+                        } else {
+                                if (num_images == 0) {
+                                        images = calloc(registry->outputs->length, sizeof(char*) * 2);
+                                } else if (num_images == -1) {
+                                        fprintf(stderr, "display must be defined for all --images or no --images.\n");
+                                        exit(EXIT_FAILURE);
+                                }
+
+                                image_path[0] = '\0';
+                                ((char**) images)[num_images * 2] = optarg;
+                                ((char**) images)[num_images++ * 2 + 1] = ++image_path;
+                        }
                         break;
+                }
                 case 's':
                         scaling_mode_str = optarg;
                         break;
                 case 't':
                         scaling_mode_str = "tile";
                         break;
+                case 'p':
+                        socket_path = optarg;
+                        break;
                 case 'v':
 #if defined SWAY_GIT_VERSION && defined SWAY_GIT_BRANCH && defined SWAY_VERSION_DATE
                         fprintf(stdout, "swaylock version %s (%s, branch \"%s\")\n", SWAY_GIT_VERSION, SWAY_VERSION_DATE, SWAY_GIT_BRANCH);
@@ -300,7 +352,12 @@ int main(int argc, char **argv) {
         password = malloc(password_size);
         password[0] = '\0';
         surfaces = create_list();
-        registry = registry_poll();
+        if (!socket_path) {
+                socket_path = get_socketpath();
+                if (!socket_path) {
+                        sway_abort("Unable to retrieve socket path");
+                }
+        }
 
         if (!registry) {
                 sway_abort("Unable to connect to wayland compositor");
@@ -316,7 +373,6 @@ int main(int argc, char **argv) {
                 registry->pointer = NULL;
         }
 
-        int i;
         for (i = 0; i < registry->outputs->length; ++i) {
                 struct output_state *output = registry->outputs->items[i];
                 struct window *window = window_setup(registry, output->width, output->height, true);
@@ -328,23 +384,38 @@ int main(int argc, char **argv) {
 
         registry->input->notify = notify_key;
 
-        cairo_surface_t *image = NULL;
-
-        if (image_path) {
-#ifdef WITH_GDK_PIXBUF
-                GError *err = NULL;
-                GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(image_path, &err);
-                if (!pixbuf) {
-                        sway_abort("Failed to load background image.");
-                }
-                image = gdk_cairo_image_surface_create_from_pixbuf(pixbuf);
-                g_object_unref(pixbuf);
-#else
-                cairo_surface_t *image = cairo_image_surface_create_from_png(argv[1]);
-#endif //WITH_GDK_PIXBUF
-                if (!image) {
-                        sway_abort("Failed to read background image.");
+        if (num_images >= 1) {
+                char **displays_paths = images;
+                images = calloc(registry->outputs->length, sizeof(cairo_surface_t*));
+
+                int socketfd = ipc_open_socket(socket_path);
+                uint32_t len = 0;
+                char *outputs = ipc_single_command(socketfd, IPC_GET_OUTPUTS, "", &len);
+                struct json_object *json_outputs = json_tokener_parse(outputs);
+
+                for (i = 0; i < registry->outputs->length; ++i) {
+                        if (displays_paths[i * 2] != NULL) {
+                                for (int j = 0;; ++j) {
+                                        if (j >= json_object_array_length(json_outputs)) {
+                                                fprintf(stderr, "%s is not an extant display\n", displays_paths[i * 2]);
+                                                exit(EXIT_FAILURE);
+                                        }
+
+                                        struct json_object *dsp_name, *at_j = json_object_array_get_idx(json_outputs, j);
+                                        if (!json_object_object_get_ex(at_j, "name", &dsp_name)) {
+                                                sway_abort("display doesn't have a name field");
+                                        }
+                                        if (!strcmp(displays_paths[i * 2], json_object_get_string(dsp_name))) {
+                                                ((cairo_surface_t**) images)[j] = load_image(displays_paths[i * 2 + 1]);
+                                                break;
+                                        }
+                                }
+                        }
                 }
+
+                json_object_put(json_outputs);
+                close(socketfd);
+                free(displays_paths);
         }
 
         for (i = 0; i < surfaces->length; ++i) {
@@ -352,15 +423,31 @@ int main(int argc, char **argv) {
                 if (!window_prerender(window) || !window->cairo) {
                         continue;
                 }
-                if (image) {
-                        render_image(window, image, scaling_mode);
-                } else {
+
+                if (num_images == 0 || color_set) {
                         render_color(window, color);
                 }
+
+                if (num_images == -1) {
+                        render_image(window, images, scaling_mode);
+                } else if (num_images >= 1) {
+                        if (((cairo_surface_t**) images)[i] != NULL) {
+                                render_image(window, ((cairo_surface_t**) images)[i], scaling_mode);
+                        }
+                }
+
+                window_render(window);
         }
 
-        if (image) {
-                cairo_surface_destroy(image);
+        if (num_images == -1) {
+                cairo_surface_destroy((cairo_surface_t*) images);
+        } else if (num_images >= 1) {
+                for (i = 0; i < registry->outputs->length; ++i) {
+                        if (((cairo_surface_t**) images)[i] != NULL) {
+                                cairo_surface_destroy(((cairo_surface_t**) images)[i]);
+                        }
+                }
+                free(images);
         }
 
         bool locked = false;
diff --git a/swaylock/swaylock.1.txt b/swaylock/swaylock.1.txt
index 04594fd0..724573ce 100644
--- a/swaylock/swaylock.1.txt
+++ b/swaylock/swaylock.1.txt
@@ -23,10 +23,11 @@ Options
         Show help message and quit.
 
 *-c, \--color* <rrggbb[aa]>::
-        Turn the screen into the given color instead of white.
+        Turn the screen into the given color instead of white. If an image is in use,
+        also enables color display.
 
-*-i, \--image* <path>::
-        Display the given image.
+*-i, \--image* [<display>:]<path>::
+        Display the given image, optionally only on the given display.
 
 *-s, \--scaling*::
         Scaling mode for images: stretch, fill, fit, center, or tile.
@@ -37,6 +38,11 @@ Options
 *-v, \--version*::
         Show the version number and quit.
 
+*--socket <path>*::
+        Use the specified socket path. Otherwise, swaymsg will ask sway where the
+        socket is (which is the value of $SWAYSOCK, then of $I3SOCK).
+
+
 Authors
 -------