sway/swaybg/main.c
2015-12-08 07:10:17 -05:00

278 lines
7.8 KiB
C

#include "wayland-desktop-shell-client-protocol.h"
#include <stdio.h>
#include <stdlib.h>
#include <wayland-client.h>
#include <time.h>
#include <string.h>
#include <gdk-pixbuf/gdk-pixbuf.h>
#include "client/window.h"
#include "client/registry.h"
#include "log.h"
#include "list.h"
list_t *surfaces;
struct registry *registry;
enum scaling_mode {
SCALING_MODE_STRETCH,
SCALING_MODE_FILL,
SCALING_MODE_FIT,
SCALING_MODE_CENTER,
SCALING_MODE_TILE,
};
#ifndef GDK_PIXBUF_CHECK_VERSION
#define GDK_PIXBUF_CHECK_VERSION(major,minor,micro) \
(GDK_PIXBUF_MAJOR > (major) || \
(GDK_PIXBUF_MAJOR == (major) && GDK_PIXBUF_MINOR > (minor)) || \
(GDK_PIXBUF_MAJOR == (major) && GDK_PIXBUF_MINOR == (minor) && \
GDK_PIXBUF_MICRO >= (micro)))
#endif
cairo_surface_t* __gdk_cairo_image_surface_create_from_pixbuf(const GdkPixbuf *gdkbuf)
{
int chan = gdk_pixbuf_get_n_channels(gdkbuf);
if (chan < 3) return NULL;
#if GDK_PIXBUF_CHECK_VERSION(2,32,0)
const guint8* gdkpix = gdk_pixbuf_read_pixels(gdkbuf);
#else
const guint8* gdkpix = gdk_pixbuf_get_pixels(gdkbuf);
#endif
if (!gdkpix) {
return NULL;
}
gint w = gdk_pixbuf_get_width(gdkbuf);
gint h = gdk_pixbuf_get_height(gdkbuf);
int stride = gdk_pixbuf_get_rowstride(gdkbuf);
cairo_format_t fmt = (chan == 3) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32;
cairo_surface_t * cs = cairo_image_surface_create (fmt, w, h);
cairo_surface_flush (cs);
if ( !cs || cairo_surface_status(cs) != CAIRO_STATUS_SUCCESS) {
return NULL;
}
int cstride = cairo_image_surface_get_stride(cs);
unsigned char * cpix = cairo_image_surface_get_data(cs);
if (chan == 3) {
int i;
for (i = h; i; --i) {
const guint8 *gp = gdkpix;
unsigned char *cp = cpix;
const guint8* end = gp + 3*w;
while (gp < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
cp[0] = gp[2];
cp[1] = gp[1];
cp[2] = gp[0];
#else
cp[1] = gp[0];
cp[2] = gp[1];
cp[3] = gp[2];
#endif
gp += 3;
cp += 4;
}
gdkpix += stride;
cpix += cstride;
}
} else {
/* premul-color = alpha/255 * color/255 * 255 = (alpha*color)/255
* (z/255) = z/256 * 256/255 = z/256 (1 + 1/255)
* = z/256 + (z/256)/255 = (z + z/255)/256
* # recurse once
* = (z + (z + z/255)/256)/256
* = (z + z/256 + z/256/255) / 256
* # only use 16bit uint operations, loose some precision,
* # result is floored.
* -> (z + z>>8)>>8
* # add 0x80/255 = 0.5 to convert floor to round
* => (z+0x80 + (z+0x80)>>8 ) >> 8
* ------
* tested as equal to lround(z/255.0) for uint z in [0..0xfe02]
*/
#define PREMUL_ALPHA(x,a,b,z) G_STMT_START { z = a * b + 0x80; x = (z + (z >> 8)) >> 8; } G_STMT_END
int i;
for (i = h; i; --i) {
const guint8 *gp = gdkpix;
unsigned char *cp = cpix;
const guint8* end = gp + 4*w;
guint z1, z2, z3;
while (gp < end) {
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
PREMUL_ALPHA(cp[0], gp[2], gp[3], z1);
PREMUL_ALPHA(cp[1], gp[1], gp[3], z2);
PREMUL_ALPHA(cp[2], gp[0], gp[3], z3);
cp[3] = gp[3];
#else
PREMUL_ALPHA(cp[1], gp[0], gp[3], z1);
PREMUL_ALPHA(cp[2], gp[1], gp[3], z2);
PREMUL_ALPHA(cp[3], gp[2], gp[3], z3);
cp[0] = gp[3];
#endif
gp += 4;
cp += 4;
}
gdkpix += stride;
cpix += cstride;
}
#undef PREMUL_ALPHA
}
cairo_surface_mark_dirty(cs);
return cs;
}
void sway_terminate(void) {
int i;
for (i = 0; i < surfaces->length; ++i) {
struct window *window = surfaces->items[i];
window_teardown(window);
}
list_free(surfaces);
registry_teardown(registry);
exit(EXIT_FAILURE);
}
int main(int argc, const char **argv) {
init_log(L_INFO);
surfaces = create_list();
registry = registry_poll();
if (argc != 4) {
sway_abort("Do not run this program manually. See man 5 sway and look for output options.");
}
if (!registry->desktop_shell) {
sway_abort("swaybg requires the compositor to support the desktop-shell extension.");
}
int desired_output = atoi(argv[1]);
sway_log(L_INFO, "Using output %d of %d", desired_output, registry->outputs->length);
int i;
struct output_state *output = registry->outputs->items[desired_output];
struct window *window = window_setup(registry, output->width, output->height, false);
if (!window) {
sway_abort("Failed to create surfaces.");
}
desktop_shell_set_background(registry->desktop_shell, output->output, window->surface);
list_add(surfaces, window);
GError *err=NULL;
GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(argv[2],&err);
if (!pixbuf) {
sway_abort("Failed to load background image.");
}
cairo_surface_t *image = __gdk_cairo_image_surface_create_from_pixbuf(pixbuf);
g_object_unref(pixbuf);
if (!image) {
sway_abort("Failed to read background image.");
}
double width = cairo_image_surface_get_width(image);
double height = cairo_image_surface_get_height(image);
const char *scaling_mode_str = argv[3];
enum scaling_mode scaling_mode = SCALING_MODE_STRETCH;
if (strcmp(scaling_mode_str, "stretch") == 0) {
scaling_mode = SCALING_MODE_STRETCH;
} else if (strcmp(scaling_mode_str, "fill") == 0) {
scaling_mode = SCALING_MODE_FILL;
} else if (strcmp(scaling_mode_str, "fit") == 0) {
scaling_mode = SCALING_MODE_FIT;
} else if (strcmp(scaling_mode_str, "center") == 0) {
scaling_mode = SCALING_MODE_CENTER;
} else if (strcmp(scaling_mode_str, "tile") == 0) {
scaling_mode = SCALING_MODE_TILE;
} else {
sway_abort("Unsupported scaling mode: %s", scaling_mode_str);
}
for (i = 0; i < surfaces->length; ++i) {
struct window *window = surfaces->items[i];
if (window_prerender(window) && window->cairo) {
switch (scaling_mode) {
case SCALING_MODE_STRETCH:
cairo_scale(window->cairo,
(double) window->width / width,
(double) window->height / height);
cairo_set_source_surface(window->cairo, image, 0, 0);
break;
case SCALING_MODE_FILL:
{
double window_ratio = (double) window->width / window->height;
double bg_ratio = width / height;
if (window_ratio > bg_ratio) {
double scale = (double) window->width / width;
cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image,
0,
(double) window->height/2 / scale - height/2);
} else {
double scale = (double) window->height / height;
cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image,
(double) window->width/2 / scale - width/2,
0);
}
break;
}
case SCALING_MODE_FIT:
{
double window_ratio = (double) window->width / window->height;
double bg_ratio = width / height;
if (window_ratio > bg_ratio) {
double scale = (double) window->height / height;
cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image,
(double) window->width/2 / scale - width/2,
0);
} else {
double scale = (double) window->width / width;
cairo_scale(window->cairo, scale, scale);
cairo_set_source_surface(window->cairo, image,
0,
(double) window->height/2 / scale - height/2);
}
break;
}
case SCALING_MODE_CENTER:
cairo_set_source_surface(window->cairo, image,
(double) window->width/2 - width/2,
(double) window->height/2 - height/2);
break;
case SCALING_MODE_TILE:
{
cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
cairo_set_source(window->cairo, pattern);
break;
}
default:
sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str);
}
cairo_paint(window->cairo);
window_render(window);
}
}
cairo_surface_destroy(image);
while (wl_display_dispatch(registry->display) != -1);
for (i = 0; i < surfaces->length; ++i) {
struct window *window = surfaces->items[i];
window_teardown(window);
}
list_free(surfaces);
registry_teardown(registry);
return 0;
}