mirror of
https://github.com/NickHu/sway
synced 2024-12-28 22:23:30 +01:00
277 lines
7.8 KiB
C
277 lines
7.8 KiB
C
#include "wayland-desktop-shell-client-protocol.h"
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#include <stdio.h>
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#include <stdlib.h>
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#include <wayland-client.h>
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#include <time.h>
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#include <string.h>
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#include <gdk-pixbuf/gdk-pixbuf.h>
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#include "client/window.h"
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#include "client/registry.h"
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#include "log.h"
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#include "list.h"
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list_t *surfaces;
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struct registry *registry;
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enum scaling_mode {
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SCALING_MODE_STRETCH,
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SCALING_MODE_FILL,
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SCALING_MODE_FIT,
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SCALING_MODE_CENTER,
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SCALING_MODE_TILE,
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};
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#ifndef GDK_PIXBUF_CHECK_VERSION
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#define GDK_PIXBUF_CHECK_VERSION(major,minor,micro) \
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(GDK_PIXBUF_MAJOR > (major) || \
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(GDK_PIXBUF_MAJOR == (major) && GDK_PIXBUF_MINOR > (minor)) || \
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(GDK_PIXBUF_MAJOR == (major) && GDK_PIXBUF_MINOR == (minor) && \
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GDK_PIXBUF_MICRO >= (micro)))
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#endif
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cairo_surface_t* __gdk_cairo_image_surface_create_from_pixbuf(const GdkPixbuf *gdkbuf)
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{
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int chan = gdk_pixbuf_get_n_channels(gdkbuf);
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if (chan < 3) return NULL;
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#if GDK_PIXBUF_CHECK_VERSION(2,32,0)
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const guint8* gdkpix = gdk_pixbuf_read_pixels(gdkbuf);
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#else
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const guint8* gdkpix = gdk_pixbuf_get_pixels(gdkbuf);
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#endif
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if (!gdkpix) {
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return NULL;
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}
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gint w = gdk_pixbuf_get_width(gdkbuf);
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gint h = gdk_pixbuf_get_height(gdkbuf);
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int stride = gdk_pixbuf_get_rowstride(gdkbuf);
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cairo_format_t fmt = (chan == 3) ? CAIRO_FORMAT_RGB24 : CAIRO_FORMAT_ARGB32;
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cairo_surface_t * cs = cairo_image_surface_create (fmt, w, h);
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cairo_surface_flush (cs);
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if ( !cs || cairo_surface_status(cs) != CAIRO_STATUS_SUCCESS) {
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return NULL;
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}
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int cstride = cairo_image_surface_get_stride(cs);
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unsigned char * cpix = cairo_image_surface_get_data(cs);
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if (chan == 3) {
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int i;
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for (i = h; i; --i) {
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const guint8 *gp = gdkpix;
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unsigned char *cp = cpix;
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const guint8* end = gp + 3*w;
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while (gp < end) {
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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cp[0] = gp[2];
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cp[1] = gp[1];
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cp[2] = gp[0];
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#else
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cp[1] = gp[0];
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cp[2] = gp[1];
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cp[3] = gp[2];
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#endif
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gp += 3;
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cp += 4;
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}
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gdkpix += stride;
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cpix += cstride;
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}
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} else {
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/* premul-color = alpha/255 * color/255 * 255 = (alpha*color)/255
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* (z/255) = z/256 * 256/255 = z/256 (1 + 1/255)
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* = z/256 + (z/256)/255 = (z + z/255)/256
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* # recurse once
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* = (z + (z + z/255)/256)/256
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* = (z + z/256 + z/256/255) / 256
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* # only use 16bit uint operations, loose some precision,
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* # result is floored.
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* -> (z + z>>8)>>8
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* # add 0x80/255 = 0.5 to convert floor to round
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* => (z+0x80 + (z+0x80)>>8 ) >> 8
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* ------
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* tested as equal to lround(z/255.0) for uint z in [0..0xfe02]
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*/
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#define PREMUL_ALPHA(x,a,b,z) G_STMT_START { z = a * b + 0x80; x = (z + (z >> 8)) >> 8; } G_STMT_END
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int i;
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for (i = h; i; --i) {
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const guint8 *gp = gdkpix;
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unsigned char *cp = cpix;
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const guint8* end = gp + 4*w;
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guint z1, z2, z3;
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while (gp < end) {
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#if G_BYTE_ORDER == G_LITTLE_ENDIAN
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PREMUL_ALPHA(cp[0], gp[2], gp[3], z1);
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PREMUL_ALPHA(cp[1], gp[1], gp[3], z2);
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PREMUL_ALPHA(cp[2], gp[0], gp[3], z3);
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cp[3] = gp[3];
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#else
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PREMUL_ALPHA(cp[1], gp[0], gp[3], z1);
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PREMUL_ALPHA(cp[2], gp[1], gp[3], z2);
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PREMUL_ALPHA(cp[3], gp[2], gp[3], z3);
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cp[0] = gp[3];
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#endif
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gp += 4;
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cp += 4;
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}
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gdkpix += stride;
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cpix += cstride;
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}
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#undef PREMUL_ALPHA
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}
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cairo_surface_mark_dirty(cs);
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return cs;
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}
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void sway_terminate(void) {
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int i;
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for (i = 0; i < surfaces->length; ++i) {
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struct window *window = surfaces->items[i];
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window_teardown(window);
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}
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list_free(surfaces);
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registry_teardown(registry);
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exit(EXIT_FAILURE);
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}
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int main(int argc, const char **argv) {
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init_log(L_INFO);
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surfaces = create_list();
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registry = registry_poll();
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if (argc != 4) {
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sway_abort("Do not run this program manually. See man 5 sway and look for output options.");
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}
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if (!registry->desktop_shell) {
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sway_abort("swaybg requires the compositor to support the desktop-shell extension.");
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}
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int desired_output = atoi(argv[1]);
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sway_log(L_INFO, "Using output %d of %d", desired_output, registry->outputs->length);
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int i;
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struct output_state *output = registry->outputs->items[desired_output];
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struct window *window = window_setup(registry, output->width, output->height, false);
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if (!window) {
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sway_abort("Failed to create surfaces.");
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}
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desktop_shell_set_background(registry->desktop_shell, output->output, window->surface);
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list_add(surfaces, window);
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GError *err=NULL;
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GdkPixbuf *pixbuf = gdk_pixbuf_new_from_file(argv[2],&err);
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if (!pixbuf) {
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sway_abort("Failed to load background image.");
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}
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cairo_surface_t *image = __gdk_cairo_image_surface_create_from_pixbuf(pixbuf);
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g_object_unref(pixbuf);
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if (!image) {
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sway_abort("Failed to read background image.");
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}
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double width = cairo_image_surface_get_width(image);
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double height = cairo_image_surface_get_height(image);
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const char *scaling_mode_str = argv[3];
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enum scaling_mode scaling_mode = SCALING_MODE_STRETCH;
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if (strcmp(scaling_mode_str, "stretch") == 0) {
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scaling_mode = SCALING_MODE_STRETCH;
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} else if (strcmp(scaling_mode_str, "fill") == 0) {
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scaling_mode = SCALING_MODE_FILL;
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} else if (strcmp(scaling_mode_str, "fit") == 0) {
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scaling_mode = SCALING_MODE_FIT;
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} else if (strcmp(scaling_mode_str, "center") == 0) {
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scaling_mode = SCALING_MODE_CENTER;
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} else if (strcmp(scaling_mode_str, "tile") == 0) {
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scaling_mode = SCALING_MODE_TILE;
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} else {
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sway_abort("Unsupported scaling mode: %s", scaling_mode_str);
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}
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for (i = 0; i < surfaces->length; ++i) {
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struct window *window = surfaces->items[i];
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if (window_prerender(window) && window->cairo) {
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switch (scaling_mode) {
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case SCALING_MODE_STRETCH:
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cairo_scale(window->cairo,
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(double) window->width / width,
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(double) window->height / height);
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cairo_set_source_surface(window->cairo, image, 0, 0);
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break;
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case SCALING_MODE_FILL:
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{
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double window_ratio = (double) window->width / window->height;
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double bg_ratio = width / height;
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if (window_ratio > bg_ratio) {
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double scale = (double) window->width / width;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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0,
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(double) window->height/2 / scale - height/2);
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} else {
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double scale = (double) window->height / height;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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(double) window->width/2 / scale - width/2,
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0);
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}
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break;
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}
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case SCALING_MODE_FIT:
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{
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double window_ratio = (double) window->width / window->height;
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double bg_ratio = width / height;
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if (window_ratio > bg_ratio) {
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double scale = (double) window->height / height;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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(double) window->width/2 / scale - width/2,
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0);
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} else {
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double scale = (double) window->width / width;
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cairo_scale(window->cairo, scale, scale);
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cairo_set_source_surface(window->cairo, image,
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0,
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(double) window->height/2 / scale - height/2);
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}
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break;
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}
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case SCALING_MODE_CENTER:
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cairo_set_source_surface(window->cairo, image,
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(double) window->width/2 - width/2,
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(double) window->height/2 - height/2);
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break;
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case SCALING_MODE_TILE:
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{
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cairo_pattern_t *pattern = cairo_pattern_create_for_surface(image);
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cairo_pattern_set_extend(pattern, CAIRO_EXTEND_REPEAT);
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cairo_set_source(window->cairo, pattern);
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break;
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}
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default:
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sway_abort("Scaling mode '%s' not implemented yet!", scaling_mode_str);
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}
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cairo_paint(window->cairo);
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window_render(window);
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}
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}
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cairo_surface_destroy(image);
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while (wl_display_dispatch(registry->display) != -1);
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for (i = 0; i < surfaces->length; ++i) {
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struct window *window = surfaces->items[i];
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window_teardown(window);
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}
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list_free(surfaces);
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registry_teardown(registry);
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return 0;
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}
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