swayfx/swaybg/main.c

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C
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#include <assert.h>
#include <ctype.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
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#include <string.h>
#include <time.h>
#include <wayland-client.h>
#include <wlr/util/log.h>
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#include "pool-buffer.h"
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#include "cairo.h"
#include "util.h"
#include "wlr-layer-shell-unstable-v1-client-protocol.h"
enum background_mode {
BACKGROUND_MODE_STRETCH,
BACKGROUND_MODE_FILL,
BACKGROUND_MODE_FIT,
BACKGROUND_MODE_CENTER,
BACKGROUND_MODE_TILE,
BACKGROUND_MODE_SOLID_COLOR,
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};
struct swaybg_args {
int output_idx;
const char *path;
enum background_mode mode;
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};
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struct swaybg_context {
uint32_t color;
cairo_surface_t *image;
};
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struct swaybg_state {
const struct swaybg_args *args;
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struct swaybg_context context;
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struct wl_display *display;
struct wl_compositor *compositor;
struct zwlr_layer_shell_v1 *layer_shell;
struct wl_shm *shm;
struct wl_output *output;
struct wl_surface *surface;
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struct wl_region *input_region;
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struct zwlr_layer_surface_v1 *layer_surface;
bool run_display;
uint32_t width, height;
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int32_t scale;
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struct pool_buffer buffers[2];
struct pool_buffer *current_buffer;
};
bool is_valid_color(const char *color) {
int len = strlen(color);
if (len != 7 || color[0] != '#') {
wlr_log(L_ERROR, "%s is not a valid color for swaybg. "
"Color should be specified as #rrggbb (no alpha).", color);
return false;
}
int i;
for (i = 1; i < len; ++i) {
if (!isxdigit(color[i])) {
return false;
}
}
return true;
}
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static void render_image(struct swaybg_state *state) {
cairo_t *cairo = state->current_buffer->cairo;
cairo_surface_t *image = state->context.image;
double width = cairo_image_surface_get_width(image);
double height = cairo_image_surface_get_height(image);
int buffer_width = state->width * state->scale;
int buffer_height = state->height * state->scale;
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switch (state->args->mode) {
case BACKGROUND_MODE_STRETCH:
cairo_scale(cairo, (double)buffer_width / width,
(double)buffer_height / height);
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cairo_set_source_surface(cairo, image, 0, 0);
break;
case BACKGROUND_MODE_FILL: {
double window_ratio = (double)buffer_width / buffer_height;
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double bg_ratio = width / height;
if (window_ratio > bg_ratio) {
double scale = (double)buffer_width / width;
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cairo_scale(cairo, scale, scale);
cairo_set_source_surface(cairo, image,
0, (double)buffer_height / 2 / scale - height / 2);
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} else {
double scale = (double)buffer_height / height;
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cairo_scale(cairo, scale, scale);
cairo_set_source_surface(cairo, image,
(double)buffer_width / 2 / scale - width / 2, 0);
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}
break;
}
case BACKGROUND_MODE_FIT: {
double window_ratio = (double)buffer_width / buffer_height;
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double bg_ratio = width / height;
if (window_ratio > bg_ratio) {
double scale = (double)buffer_height / height;
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cairo_scale(cairo, scale, scale);
cairo_set_source_surface(cairo, image,
(double)buffer_width / 2 / scale - width / 2, 0);
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} else {
double scale = (double)buffer_width / width;
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cairo_scale(cairo, scale, scale);
cairo_set_source_surface(cairo, image,
0, (double)buffer_height / 2 / scale - height / 2);
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}
break;
}
case BACKGROUND_MODE_CENTER:
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cairo_set_source_surface(cairo, image,
(double)buffer_width / 2 - width / 2,
(double)buffer_height / 2 - height / 2);
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break;
case BACKGROUND_MODE_TILE: {
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cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
cairo_set_source(cairo, pattern);
break;
}
case BACKGROUND_MODE_SOLID_COLOR:
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assert(0);
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break;
}
cairo_paint(cairo);
}
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static void render_frame(struct swaybg_state *state) {
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state->current_buffer = get_next_buffer(state->shm, state->buffers,
state->width * state->scale, state->height * state->scale);
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cairo_t *cairo = state->current_buffer->cairo;
switch (state->args->mode) {
case BACKGROUND_MODE_SOLID_COLOR:
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cairo_set_source_u32(cairo, state->context.color);
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cairo_paint(cairo);
break;
default:
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render_image(state);
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break;
}
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wl_surface_set_buffer_scale(state->surface, state->scale);
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wl_surface_attach(state->surface, state->current_buffer->buffer, 0, 0);
wl_surface_damage(state->surface, 0, 0, state->width, state->height);
wl_surface_commit(state->surface);
}
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static bool prepare_context(struct swaybg_state *state) {
if (state->args->mode == BACKGROUND_MODE_SOLID_COLOR) {
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state->context.color = parse_color(state->args->path);
return is_valid_color(state->args->path);
}
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#ifdef HAVE_GDK_PIXBUF
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GError *err = NULL;
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(state->args->path, &err);
if (!pixbuf) {
wlr_log(L_ERROR, "Failed to load background image.");
return false;
}
state->context.image = gdk_cairo_image_surface_create_from_pixbuf(pixbuf);
g_object_unref(pixbuf);
#else
state->context.image = cairo_image_surface_create_from_png(
state->args->path);
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#endif //HAVE_GDK_PIXBUF
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if (!state->context.image) {
wlr_log(L_ERROR, "Failed to read background image.");
return false;
}
if (cairo_surface_status(state->context.image) != CAIRO_STATUS_SUCCESS) {
wlr_log(L_ERROR, "Failed to read background image: %s."
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#ifndef HAVE_GDK_PIXBUF
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"\nSway was compiled without gdk_pixbuf support, so only"
"\nPNG images can be loaded. This is the likely cause."
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#endif //HAVE_GDK_PIXBUF
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, cairo_status_to_string(
cairo_surface_status(state->context.image)));
return false;
}
return true;
}
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static void layer_surface_configure(void *data,
struct zwlr_layer_surface_v1 *surface,
uint32_t serial, uint32_t width, uint32_t height) {
struct swaybg_state *state = data;
state->width = width;
state->height = height;
zwlr_layer_surface_v1_ack_configure(surface, serial);
render_frame(state);
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}
static void layer_surface_closed(void *data,
struct zwlr_layer_surface_v1 *surface) {
struct swaybg_state *state = data;
zwlr_layer_surface_v1_destroy(state->layer_surface);
wl_surface_destroy(state->surface);
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wl_region_destroy(state->input_region);
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state->run_display = false;
}
struct zwlr_layer_surface_v1_listener layer_surface_listener = {
.configure = layer_surface_configure,
.closed = layer_surface_closed,
};
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static void output_geometry(void *data, struct wl_output *output, int32_t x,
int32_t y, int32_t width_mm, int32_t height_mm, int32_t subpixel,
const char *make, const char *model, int32_t transform) {
// Who cares
}
static void output_mode(void *data, struct wl_output *output, uint32_t flags,
int32_t width, int32_t height, int32_t refresh) {
// Who cares
}
static void output_done(void *data, struct wl_output *output) {
// Who cares
}
static void output_scale(void *data, struct wl_output *output, int32_t factor) {
struct swaybg_state *state = data;
state->scale = factor;
if (state->run_display) {
render_frame(state);
}
}
struct wl_output_listener output_listener = {
.geometry = output_geometry,
.mode = output_mode,
.done = output_done,
.scale = output_scale,
};
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static void handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version) {
struct swaybg_state *state = data;
if (strcmp(interface, wl_compositor_interface.name) == 0) {
state->compositor = wl_registry_bind(registry, name,
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&wl_compositor_interface, 3);
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} else if (strcmp(interface, wl_shm_interface.name) == 0) {
state->shm = wl_registry_bind(registry, name,
&wl_shm_interface, 1);
} else if (strcmp(interface, wl_output_interface.name) == 0) {
static int output_idx = 0;
if (output_idx == state->args->output_idx) {
state->output = wl_registry_bind(registry, name,
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&wl_output_interface, 3);
wl_output_add_listener(state->output, &output_listener, state);
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}
output_idx++;
} else if (strcmp(interface, zwlr_layer_shell_v1_interface.name) == 0) {
state->layer_shell = wl_registry_bind(
registry, name, &zwlr_layer_shell_v1_interface, 1);
}
}
static void handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// who cares
}
static const struct wl_registry_listener registry_listener = {
.global = handle_global,
.global_remove = handle_global_remove,
};
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int main(int argc, const char **argv) {
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struct swaybg_args args = {0};
struct swaybg_state state = {0};
state.args = &args;
wlr_log_init(L_DEBUG, NULL);
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if (argc != 4) {
wlr_log(L_ERROR, "Do not run this program manually. "
"See man 5 sway and look for output options.");
return 1;
}
args.output_idx = atoi(argv[1]);
args.path = argv[2];
args.mode = BACKGROUND_MODE_STRETCH;
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if (strcmp(argv[3], "stretch") == 0) {
args.mode = BACKGROUND_MODE_STRETCH;
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} else if (strcmp(argv[3], "fill") == 0) {
args.mode = BACKGROUND_MODE_FILL;
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} else if (strcmp(argv[3], "fit") == 0) {
args.mode = BACKGROUND_MODE_FIT;
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} else if (strcmp(argv[3], "center") == 0) {
args.mode = BACKGROUND_MODE_CENTER;
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} else if (strcmp(argv[3], "tile") == 0) {
args.mode = BACKGROUND_MODE_TILE;
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} else if (strcmp(argv[3], "solid_color") == 0) {
args.mode = BACKGROUND_MODE_SOLID_COLOR;
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} else {
wlr_log(L_ERROR, "Unsupported background mode: %s", argv[3]);
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return 1;
}
if (!prepare_context(&state)) {
return 1;
}
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assert(state.display = wl_display_connect(NULL));
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struct wl_registry *registry = wl_display_get_registry(state.display);
wl_registry_add_listener(registry, &registry_listener, &state);
wl_display_roundtrip(state.display);
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assert(state.compositor && state.layer_shell && state.output && state.shm);
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// Second roundtrip to get output properties
wl_display_roundtrip(state.display);
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assert(state.surface = wl_compositor_create_surface(state.compositor));
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assert(state.input_region = wl_compositor_create_region(state.compositor));
wl_surface_set_input_region(state.surface, state.input_region);
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state.layer_surface = zwlr_layer_shell_v1_get_layer_surface(
state.layer_shell, state.surface, state.output,
ZWLR_LAYER_SHELL_V1_LAYER_BACKGROUND, "wallpaper");
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assert(state.layer_surface);
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zwlr_layer_surface_v1_set_size(state.layer_surface, 0, 0);
zwlr_layer_surface_v1_set_anchor(state.layer_surface,
ZWLR_LAYER_SURFACE_V1_ANCHOR_TOP |
ZWLR_LAYER_SURFACE_V1_ANCHOR_RIGHT |
ZWLR_LAYER_SURFACE_V1_ANCHOR_BOTTOM |
ZWLR_LAYER_SURFACE_V1_ANCHOR_LEFT);
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zwlr_layer_surface_v1_set_exclusive_zone(state.layer_surface, -1);
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zwlr_layer_surface_v1_add_listener(state.layer_surface,
&layer_surface_listener, &state);
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state.run_display = true;
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wl_surface_commit(state.surface);
wl_display_roundtrip(state.display);
while (wl_display_dispatch(state.display) != -1 && state.run_display) {
// This space intentionally left blank
}
return 0;
}