Add screenshot interface
Adds methods to shell_global to allow taking screenshots save the result into a specified png image. It exposes three methods via shellDBus applications like gnome-screenshot: *) Screenshot (screenshots the whole screen) *) ScreenshotWindow (screenshots the focused window) *) ScreenshotArea (screenshots a specific area) https://bugzilla.gnome.org/show_bug.cgi?id=652952
This commit is contained in:
Adel Gadllah
@ -1628,3 +1628,232 @@ shell_global_launch_calendar_server (ShellGlobal *global)
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g_free (calendar_server_exe);
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}
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static void
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grab_screenshot (ClutterActor *stage,
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_screenshot_data *screenshot_data)
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{
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MetaScreen *screen = shell_global_get_screen (screenshot_data->global);
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cairo_status_t status;
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cairo_surface_t *image;
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guchar *data;
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int width, height;
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meta_plugin_query_screen_size (screenshot_data->global->plugin, &width, &height);
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image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, width, height);
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data = cairo_image_surface_get_data (image);
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cogl_flush();
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cogl_read_pixels (0, 0, width, height, COGL_READ_PIXELS_COLOR_BUFFER, CLUTTER_CAIRO_FORMAT_ARGB32, data);
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cairo_surface_mark_dirty (image);
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if (meta_screen_get_n_monitors (screen) > 1)
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{
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cairo_region_t *screen_region = cairo_region_create ();
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cairo_region_t *stage_region;
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MetaRectangle monitor_rect;
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cairo_rectangle_int_t stage_rect;
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int i;
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cairo_t *cr;
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for (i = meta_screen_get_n_monitors (screen) - 1; i >= 0; i--)
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{
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meta_screen_get_monitor_geometry (screen, i, &monitor_rect);
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cairo_region_union_rectangle (screen_region, (const cairo_rectangle_int_t *) &monitor_rect);
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}
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stage_rect.x = 0;
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stage_rect.y = 0;
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stage_rect.width = width;
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stage_rect.height = height;
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stage_region = cairo_region_create_rectangle ((const cairo_rectangle_int_t *) &stage_rect);
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cairo_region_xor (stage_region, screen_region);
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cairo_region_destroy (screen_region);
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cr = cairo_create (image);
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for (i = 0; i < cairo_region_num_rectangles (stage_region); i++)
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{
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cairo_rectangle_int_t rect;
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cairo_region_get_rectangle (stage_region, i, &rect);
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cairo_rectangle (cr, (double) rect.x, (double) rect.y, (double) rect.width, (double) rect.height);
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cairo_fill (cr);
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}
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cairo_destroy (cr);
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cairo_region_destroy (stage_region);
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}
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status = cairo_surface_write_to_png (image, screenshot_data->filename);
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cairo_surface_destroy (image);
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if (screenshot_data->callback)
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screenshot_data->callback (screenshot_data->global, status == CAIRO_STATUS_SUCCESS);
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g_signal_handlers_disconnect_by_func (stage, (void *)grab_screenshot, (gpointer)screenshot_data);
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g_free (screenshot_data->filename);
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g_free (screenshot_data);
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}
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static void
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grab_area_screenshot (ClutterActor *stage,
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_screenshot_data *screenshot_data)
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{
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cairo_status_t status;
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cairo_surface_t *image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32, screenshot_data->width, screenshot_data->height);
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guchar *data = cairo_image_surface_get_data (image);
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cogl_flush();
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cogl_read_pixels (screenshot_data->x, screenshot_data->y, screenshot_data->width, screenshot_data->height,
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COGL_READ_PIXELS_COLOR_BUFFER, CLUTTER_CAIRO_FORMAT_ARGB32, data);
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cairo_surface_mark_dirty (image);
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status = cairo_surface_write_to_png (image, screenshot_data->filename);
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cairo_surface_destroy (image);
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if (screenshot_data->callback)
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screenshot_data->callback (screenshot_data->global, status == CAIRO_STATUS_SUCCESS);
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g_signal_handlers_disconnect_by_func (stage, (void *)grab_area_screenshot, (gpointer)screenshot_data);
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g_free (screenshot_data->filename);
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g_free (screenshot_data);
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}
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/**
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* shell_global_screenshot:
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* @global: the #ShellGlobal
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* @filename: The filename for the screenshot
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* @callback: (scope async): function to call returning success or failure
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* of the async grabbing
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*
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* Takes a screenshot of the whole screen
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* in @filename as png image.
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*
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*/
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void
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shell_global_screenshot (ShellGlobal *global,
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const char *filename,
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ShellGlobalScreenshotCallback callback)
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{
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ClutterActor *stage;
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_screenshot_data *data = g_new0 (_screenshot_data, 1);
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data->global = global;
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data->filename = g_strdup (filename);
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data->callback = callback;
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stage = CLUTTER_ACTOR (meta_plugin_get_stage (global->plugin));
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g_signal_connect_after (stage, "paint", G_CALLBACK (grab_screenshot), (gpointer)data);
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clutter_actor_queue_redraw (stage);
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}
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/**
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* shell_global_screenshot_area:
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* @global: the #ShellGlobal
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* @x: The X coordinate of the area
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* @y: The Y coordinate of the area
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* @width: The width of the area
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* @height: The height of the area
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* @filename: The filename for the screenshot
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* @callback: (scope async): function to call returning success or failure
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* of the async grabbing
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*
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* Takes a screenshot of the passed in area and saves it
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* in @filename as png image.
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*
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*/
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void
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shell_global_screenshot_area (ShellGlobal *global,
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int x,
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int y,
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int width,
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int height,
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const char *filename,
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ShellGlobalScreenshotCallback callback)
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{
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ClutterActor *stage;
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_screenshot_data *data = g_new0 (_screenshot_data, 1);
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data->global = global;
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data->filename = g_strdup (filename);
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data->x = x;
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data->y = y;
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data->width = width;
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data->height = height;
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data->callback = callback;
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stage = CLUTTER_ACTOR (meta_plugin_get_stage (global->plugin));
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g_signal_connect_after (stage, "paint", G_CALLBACK (grab_area_screenshot), (gpointer)data);
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clutter_actor_queue_redraw (stage);
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}
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/**
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* shell_global_screenshot_window:
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* @global: the #ShellGlobal
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* @include_frame: Whether to include the frame or not
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*
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* @filename: The filename for the screenshot
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*
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* Takes a screenshot of the focused window (optionally omitting the frame)
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* in @filename as png image.
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*
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* Return value: success or failure.
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*/
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gboolean
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shell_global_screenshot_window (ShellGlobal *global,
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gboolean include_frame,
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const char *filename)
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{
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CoglHandle texture;
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cairo_surface_t *image;
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guchar *data;
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MetaScreen *screen = meta_plugin_get_screen (global->plugin);
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MetaDisplay *display = meta_screen_get_display (screen);
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MetaWindow *window = meta_display_get_focus_window (display);
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ClutterActor *window_actor;
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cairo_status_t status;
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window_actor = CLUTTER_ACTOR (meta_window_get_compositor_private (window));
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texture = clutter_texture_get_cogl_texture (CLUTTER_TEXTURE (meta_window_actor_get_texture (META_WINDOW_ACTOR (window_actor))));
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if (!include_frame)
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{
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MetaRectangle *window_rect = meta_window_get_rect (window);
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texture = cogl_texture_new_from_sub_texture (texture,
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window_rect->x,
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window_rect->y,
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window_rect->width,
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window_rect->height);
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image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
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window_rect->width,
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window_rect->height);
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}
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else
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image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
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clutter_actor_get_width (window_actor),
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clutter_actor_get_height (window_actor));
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data = cairo_image_surface_get_data (image);
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cogl_flush();
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cogl_texture_get_data (texture, CLUTTER_CAIRO_FORMAT_ARGB32, 0, data);
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cairo_surface_mark_dirty (image);
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status = cairo_surface_write_to_png (image, filename);
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cairo_surface_destroy (image);
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return status == CAIRO_STATUS_SUCCESS;
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}
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