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icon.c
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icon.c
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#define _POSIX_C_SOURCE 200809L
#include <assert.h>
#include <errno.h>
#include <fnmatch.h>
#include <glob.h>
#include <libgen.h>
#include <stdio.h>
#include <stdlib.h>
#include <assert.h>
#include <ctype.h>
#include <cairo/cairo.h>
#include "mako.h"
#include "icon.h"
#include "string-util.h"
#include "wayland.h"
#ifdef HAVE_ICONS
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "cairo-pixbuf.h"
static GdkPixbuf *load_image(const char *path) {
if (strlen(path) == 0) {
return NULL;
}
GError *err = NULL;
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(path, &err);
if (!pixbuf) {
fprintf(stderr, "Failed to load icon (%s)\n", err->message);
g_error_free(err);
return NULL;
}
return pixbuf;
}
static GdkPixbuf *load_image_data(struct mako_image_data *image_data) {
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_data(image_data->data, GDK_COLORSPACE_RGB,
image_data->has_alpha, image_data->bits_per_sample, image_data->width,
image_data->height, image_data->rowstride, NULL, NULL);
if (!pixbuf) {
fprintf(stderr, "Failed to load icon\n");
return NULL;
}
return pixbuf;
}
static double fit_to_square(int width, int height, int square_size) {
double longest = width > height ? width : height;
return longest > square_size ? square_size/longest : 1.0;
}
static char hex_val(char digit) {
assert(isxdigit(digit));
if (digit >= 'a') {
return digit - 'a' + 10;
} else if (digit >= 'A') {
return digit - 'A' + 10;
} else {
return digit - '0';
}
}
static void url_decode(char *dst, const char *src) {
while (src[0]) {
if (src[0] == '%' && isxdigit(src[1]) && isxdigit(src[2])) {
dst[0] = 16*hex_val(src[1]) + hex_val(src[2]);
dst++; src += 3;
} else {
dst[0] = src[0];
dst++; src++;
}
}
dst[0] = '\0';
}
// Attempt to find a full path for a notification's icon_name, which may be:
// - An absolute path, which will simply be returned (as a new string)
// - A file:// URI, which will be converted to an absolute path
// - A Freedesktop icon name, which will be resolved within the configured
// `icon-path` using something that looks vaguely like the algorithm defined
// in the icon theme spec (https://standards.freedesktop.org/icon-theme-spec/icon-theme-spec-latest.html)
//
// Returns the resolved path, or NULL if it was unable to find an icon. The
// return value must be freed by the caller.
static char *resolve_icon(struct mako_notification *notif) {
char *icon_name = notif->app_icon;
if (icon_name[0] == '\0') {
return NULL;
}
if (icon_name[0] == '/') {
return strdup(icon_name);
}
if (strstr(icon_name, "file://") == icon_name) {
// Chop off the scheme and URL decode
char *icon_path = malloc(strlen(icon_name) + 1 - strlen("file://"));
if (icon_path == NULL) {
return icon_path;
}
url_decode(icon_path, icon_name + strlen("file://"));
return icon_path;
}
// Determine the largest scale factor of any attached output.
int32_t max_scale = 1;
struct mako_output *output = NULL;
wl_list_for_each(output, ¬if->state->outputs, link) {
if (output->scale > max_scale) {
max_scale = output->scale;
}
}
static const char fallback[] = "%s:/usr/share/icons/hicolor";
char *search = mako_asprintf(fallback, notif->style.icon_path);
char *saveptr = NULL;
char *theme_path = strtok_r(search, ":", &saveptr);
// Match all icon files underneath of the theme_path followed by any icon
// size and category subdirectories. This pattern assumes that all the
// files in the icon path are valid icon types.
static const char pattern_fmt[] = "%s/*/*/%s.*";
char *icon_path = NULL;
int32_t last_icon_size = 0;
while (theme_path) {
if (strlen(theme_path) == 0) {
continue;
}
glob_t icon_glob = {0};
char *pattern = mako_asprintf(pattern_fmt, theme_path, icon_name);
// Disable sorting because we're going to do our own anyway.
int found = glob(pattern, GLOB_NOSORT, NULL, &icon_glob);
size_t found_count = 0;
if (found == 0) {
// The value of gl_pathc isn't guaranteed to be usable if glob
// returns non-zero.
found_count = icon_glob.gl_pathc;
}
for (size_t i = 0; i < found_count; ++i) {
char *relative_path = icon_glob.gl_pathv[i];
// Find the end of the current search path and walk to the next
// path component. Hopefully this will be the icon resolution
// subdirectory.
relative_path += strlen(theme_path);
while (relative_path[0] == '/') {
++relative_path;
}
errno = 0;
int32_t icon_size = strtol(relative_path, NULL, 10);
if (errno || icon_size == 0) {
// Try second level subdirectory if failed.
errno = 0;
while (relative_path[0] != '/') {
++relative_path;
}
++relative_path;
icon_size = strtol(relative_path, NULL, 10);
if (errno || icon_size == 0) {
continue;
}
}
int32_t icon_scale = 1;
char *scale_str = strchr(relative_path, '@');
if (scale_str != NULL) {
icon_scale = strtol(scale_str + 1, NULL, 10);
}
if (icon_size == notif->style.max_icon_size &&
icon_scale == max_scale) {
// If we find an exact match, we're done.
free(icon_path);
icon_path = strdup(icon_glob.gl_pathv[i]);
break;
} else if (icon_size < notif->style.max_icon_size * max_scale &&
icon_size > last_icon_size) {
// Otherwise, if this icon is small enough to fit but bigger
// than the last best match, choose it on a provisional basis.
// We multiply by max_scale to increase the odds of finding an
// icon which looks sharp on the highest-scale output.
free(icon_path);
icon_path = strdup(icon_glob.gl_pathv[i]);
last_icon_size = icon_size;
}
}
free(pattern);
globfree(&icon_glob);
if (icon_path) {
// The spec says that if we find any match whatsoever in a theme,
// we should stop there to avoid mixing icons from different
// themes even if one is a better size.
break;
}
theme_path = strtok_r(NULL, ":", &saveptr);
}
if (icon_path == NULL) {
// Finally, fall back to looking in /usr/share/pixmaps. These are
// unsized icons, which may lead to downscaling, but some apps are
// still using it.
static const char pixmaps_fmt[] = "/usr/share/pixmaps/%s.*";
char *pattern = mako_asprintf(pixmaps_fmt, icon_name);
glob_t icon_glob = {0};
int found = glob(pattern, GLOB_NOSORT, NULL, &icon_glob);
if (found == 0 && icon_glob.gl_pathc > 0) {
icon_path = strdup(icon_glob.gl_pathv[0]);
}
free(pattern);
globfree(&icon_glob);
}
free(search);
return icon_path;
}
struct mako_icon *create_icon(struct mako_notification *notif) {
GdkPixbuf *image = NULL;
if (notif->image_data != NULL) {
image = load_image_data(notif->image_data);
}
if (image == NULL) {
char *path = resolve_icon(notif);
if (path == NULL) {
return NULL;
}
image = load_image(path);
free(path);
if (image == NULL) {
return NULL;
}
}
int image_width = gdk_pixbuf_get_width(image);
int image_height = gdk_pixbuf_get_height(image);
struct mako_icon *icon = calloc(1, sizeof(struct mako_icon));
icon->scale = fit_to_square(
image_width, image_height, notif->style.max_icon_size);
icon->width = image_width * icon->scale;
icon->height = image_height * icon->scale;
icon->image = create_cairo_surface_from_gdk_pixbuf(image);
g_object_unref(image);
if (icon->image == NULL) {
free(icon);
return NULL;
}
return icon;
}
#else
struct mako_icon *create_icon(struct mako_notification *notif) {
return NULL;
}
#endif
void draw_icon(cairo_t *cairo, struct mako_icon *icon,
double xpos, double ypos, double scale) {
cairo_save(cairo);
cairo_scale(cairo, scale*icon->scale, scale*icon->scale);
cairo_set_source_surface(cairo, icon->image, xpos/icon->scale, ypos/icon->scale);
cairo_paint(cairo);
cairo_restore(cairo);
}
void destroy_icon(struct mako_icon *icon) {
if (icon != NULL) {
if (icon->image != NULL) {
cairo_surface_destroy(icon->image);
}
free(icon);
}
}