gnome-shell/src/shell-screenshot.c

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/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */
#include <clutter/clutter.h>
#include <cogl/cogl.h>
#include <meta/display.h>
#include <meta/util.h>
#include <meta/meta-plugin.h>
#include <meta/meta-shaped-texture.h>
#include <meta/meta-cursor-tracker.h>
#include <st/st.h>
#include "shell-global.h"
#include "shell-screenshot.h"
#include "shell-util.h"
typedef struct _ShellScreenshotPrivate ShellScreenshotPrivate;
struct _ShellScreenshot
{
GObject parent_instance;
ShellScreenshotPrivate *priv;
};
struct _ShellScreenshotPrivate
{
ShellGlobal *global;
char *filename;
char *filename_used;
GDateTime *datetime;
cairo_surface_t *image;
cairo_rectangle_int_t screenshot_area;
gboolean include_cursor;
gboolean include_frame;
};
typedef enum
{
SHELL_SCREENSHOT_SCREEN,
SHELL_SCREENSHOT_WINDOW,
SHELL_SCREENSHOT_AREA,
} ShellScreenshotMode;
G_DEFINE_TYPE_WITH_PRIVATE (ShellScreenshot, shell_screenshot, G_TYPE_OBJECT);
static void
shell_screenshot_class_init (ShellScreenshotClass *screenshot_class)
{
(void) screenshot_class;
}
static void
shell_screenshot_init (ShellScreenshot *screenshot)
{
screenshot->priv = shell_screenshot_get_instance_private (screenshot);
screenshot->priv->global = shell_global_get ();
}
static void
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on_screenshot_written (GObject *source,
GAsyncResult *task,
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gpointer user_data)
{
ShellScreenshot *screenshot = SHELL_SCREENSHOT (source);
ShellScreenshotPrivate *priv = screenshot->priv;
GTask *result = user_data;
g_task_return_boolean (result, g_task_propagate_boolean (G_TASK (task), NULL));
g_object_unref (result);
g_clear_pointer (&priv->image, cairo_surface_destroy);
g_clear_pointer (&priv->filename, g_free);
g_clear_pointer (&priv->filename_used, g_free);
g_clear_pointer (&priv->datetime, g_date_time_unref);
meta_enable_unredirect_for_display (shell_global_get_display (priv->global));
}
/* called in an I/O thread */
static GOutputStream *
get_stream_for_unique_path (const gchar *path,
const gchar *filename,
gchar **filename_used)
{
GOutputStream *stream;
GFile *file;
gchar *real_path, *real_filename, *name, *ptr;
gint idx;
ptr = g_strrstr (filename, ".png");
if (ptr != NULL)
real_filename = g_strndup (filename, ptr - filename);
else
real_filename = g_strdup (filename);
idx = 0;
real_path = NULL;
do
{
if (idx == 0)
name = g_strdup_printf ("%s.png", real_filename);
else
name = g_strdup_printf ("%s - %d.png", real_filename, idx);
real_path = g_build_filename (path, name, NULL);
g_free (name);
file = g_file_new_for_path (real_path);
stream = G_OUTPUT_STREAM (g_file_create (file, G_FILE_CREATE_NONE, NULL, NULL));
g_object_unref (file);
if (stream != NULL)
*filename_used = real_path;
else
g_free (real_path);
idx++;
}
while (stream == NULL);
g_free (real_filename);
return stream;
}
/* called in an I/O thread */
static GOutputStream *
get_stream_for_filename (const gchar *filename,
gchar **filename_used)
{
const gchar *path;
path = g_get_user_special_dir (G_USER_DIRECTORY_PICTURES);
if (!g_file_test (path, G_FILE_TEST_EXISTS))
{
path = g_get_home_dir ();
if (!g_file_test (path, G_FILE_TEST_EXISTS))
return NULL;
}
return get_stream_for_unique_path (path, filename, filename_used);
}
static GOutputStream *
prepare_write_stream (const gchar *filename,
gchar **filename_used)
{
GOutputStream *stream;
GFile *file;
if (g_path_is_absolute (filename))
{
file = g_file_new_for_path (filename);
*filename_used = g_strdup (filename);
stream = G_OUTPUT_STREAM (g_file_replace (file, NULL, FALSE, G_FILE_CREATE_NONE, NULL, NULL));
g_object_unref (file);
}
else
{
stream = get_stream_for_filename (filename, filename_used);
}
return stream;
}
static void
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write_screenshot_thread (GTask *result,
gpointer object,
gpointer task_data,
GCancellable *cancellable)
{
cairo_status_t status;
GOutputStream *stream;
ShellScreenshot *screenshot = SHELL_SCREENSHOT (object);
ShellScreenshotPrivate *priv;
char *creation_time;
g_assert (screenshot != NULL);
priv = screenshot->priv;
stream = prepare_write_stream (priv->filename,
&priv->filename_used);
if (stream == NULL)
status = CAIRO_STATUS_FILE_NOT_FOUND;
else
{
GdkPixbuf *pixbuf;
pixbuf = gdk_pixbuf_get_from_surface (priv->image,
0, 0,
cairo_image_surface_get_width (priv->image),
cairo_image_surface_get_height (priv->image));
creation_time = g_date_time_format (priv->datetime, "%c");
if (!creation_time)
creation_time = g_date_time_format (priv->datetime, "%FT%T%z");
if (gdk_pixbuf_save_to_stream (pixbuf, stream, "png", NULL, NULL,
"tEXt::Software", "gnome-screenshot",
"tEXt::Creation Time", creation_time,
NULL))
status = CAIRO_STATUS_SUCCESS;
else
status = CAIRO_STATUS_WRITE_ERROR;
g_object_unref (pixbuf);
g_free (creation_time);
}
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g_task_return_boolean (result, status == CAIRO_STATUS_SUCCESS);
g_clear_object (&stream);
}
static void
do_grab_screenshot (ShellScreenshot *screenshot,
ClutterStage *stage,
int x,
int y,
int width,
int height)
{
ShellScreenshotPrivate *priv = screenshot->priv;
cairo_rectangle_int_t screenshot_rect = { x, y, width, height };
ClutterCapture *captures;
int n_captures;
int i;
if (!clutter_stage_capture (stage, FALSE,
&screenshot_rect,
&captures,
&n_captures))
return;
if (n_captures == 1)
priv->image = cairo_surface_reference (captures[0].image);
else
{
float target_scale;
clutter_stage_get_capture_final_size (stage, &screenshot_rect,
&width, &height, &target_scale);
priv->image = shell_util_composite_capture_images (captures,
n_captures,
x, y,
width, height,
target_scale);
}
priv->datetime = g_date_time_new_now_local ();
for (i = 0; i < n_captures; i++)
cairo_surface_destroy (captures[i].image);
g_free (captures);
}
static gboolean
should_draw_cursor_image (ShellScreenshotMode mode)
{
if (mode == SHELL_SCREENSHOT_WINDOW || !meta_is_wayland_compositor ())
{
StSettings *settings = st_settings_get ();
gboolean magnifier_active = FALSE;
g_object_get (settings, "magnifier-active", &magnifier_active, NULL);
if (!magnifier_active)
return TRUE;
}
return FALSE;
}
static void
draw_cursor_image (cairo_surface_t *surface,
cairo_rectangle_int_t area)
{
CoglTexture *texture;
int width, height;
int stride;
guint8 *data;
MetaDisplay *display;
MetaCursorTracker *tracker;
cairo_surface_t *cursor_surface;
cairo_region_t *screenshot_region;
cairo_t *cr;
int x, y;
int xhot, yhot;
double xscale, yscale;
display = shell_global_get_display (shell_global_get ());
tracker = meta_cursor_tracker_get_for_display (display);
texture = meta_cursor_tracker_get_sprite (tracker);
if (!texture)
return;
screenshot_region = cairo_region_create_rectangle (&area);
meta_cursor_tracker_get_pointer (tracker, &x, &y, NULL);
if (!cairo_region_contains_point (screenshot_region, x, y))
{
cairo_region_destroy (screenshot_region);
return;
}
meta_cursor_tracker_get_hot (tracker, &xhot, &yhot);
width = cogl_texture_get_width (texture);
height = cogl_texture_get_height (texture);
stride = 4 * width;
data = g_new (guint8, stride * height);
cogl_texture_get_data (texture, CLUTTER_CAIRO_FORMAT_ARGB32, stride, data);
/* FIXME: cairo-gl? */
cursor_surface = cairo_image_surface_create_for_data (data,
CAIRO_FORMAT_ARGB32,
width, height,
stride);
cairo_surface_get_device_scale (surface, &xscale, &yscale);
if (xscale != 1.0 || yscale != 1.0)
{
int monitor;
float monitor_scale;
MetaRectangle cursor_rect = {
.x = x, .y = y, .width = width, .height = height
};
monitor = meta_display_get_monitor_index_for_rect (display, &cursor_rect);
monitor_scale = meta_display_get_monitor_scale (display, monitor);
cairo_surface_set_device_scale (cursor_surface, monitor_scale, monitor_scale);
}
cr = cairo_create (surface);
cairo_set_source_surface (cr,
cursor_surface,
x - xhot - area.x,
y - yhot - area.y);
cairo_paint (cr);
cairo_destroy (cr);
cairo_surface_destroy (cursor_surface);
cairo_region_destroy (screenshot_region);
g_free (data);
}
static void
grab_screenshot (ClutterActor *stage,
GTask *result)
{
MetaDisplay *display;
int width, height;
ShellScreenshot *screenshot = g_task_get_source_object (result);
ShellScreenshotPrivate *priv = screenshot->priv;
GTask *task;
display = shell_global_get_display (priv->global);
meta_display_get_size (display, &width, &height);
do_grab_screenshot (screenshot, CLUTTER_STAGE (stage), 0, 0, width, height);
if (meta_display_get_n_monitors (display) > 1)
{
cairo_region_t *screen_region = cairo_region_create ();
cairo_region_t *stage_region;
MetaRectangle monitor_rect;
cairo_rectangle_int_t stage_rect;
int i;
cairo_t *cr;
for (i = meta_display_get_n_monitors (display) - 1; i >= 0; i--)
{
meta_display_get_monitor_geometry (display, i, &monitor_rect);
cairo_region_union_rectangle (screen_region,
(const cairo_rectangle_int_t *) &monitor_rect);
}
stage_rect.x = 0;
stage_rect.y = 0;
stage_rect.width = width;
stage_rect.height = height;
stage_region = cairo_region_create_rectangle ((const cairo_rectangle_int_t *) &stage_rect);
cairo_region_xor (stage_region, screen_region);
cairo_region_destroy (screen_region);
cr = cairo_create (priv->image);
for (i = 0; i < cairo_region_num_rectangles (stage_region); i++)
{
cairo_rectangle_int_t rect;
cairo_region_get_rectangle (stage_region, i, &rect);
cairo_rectangle (cr, (double) rect.x, (double) rect.y, (double) rect.width, (double) rect.height);
cairo_fill (cr);
}
cairo_destroy (cr);
cairo_region_destroy (stage_region);
}
priv->screenshot_area.x = 0;
priv->screenshot_area.y = 0;
priv->screenshot_area.width = width;
priv->screenshot_area.height = height;
if (priv->include_cursor)
draw_cursor_image (priv->image, priv->screenshot_area);
g_signal_handlers_disconnect_by_func (stage, grab_screenshot, result);
task = g_task_new (screenshot, NULL, on_screenshot_written, result);
g_task_run_in_thread (task, write_screenshot_thread);
g_object_unref (task);
}
static void
grab_area_screenshot (ClutterActor *stage,
GTask *result)
{
ShellScreenshot *screenshot = g_task_get_source_object (result);
ShellScreenshotPrivate *priv = screenshot->priv;
GTask *task;
do_grab_screenshot (screenshot,
CLUTTER_STAGE (stage),
priv->screenshot_area.x,
priv->screenshot_area.y,
priv->screenshot_area.width,
priv->screenshot_area.height);
g_signal_handlers_disconnect_by_func (stage, grab_area_screenshot, result);
task = g_task_new (screenshot, NULL, on_screenshot_written, result);
g_task_run_in_thread (task, write_screenshot_thread);
g_object_unref (task);
}
static void
grab_window_screenshot (ClutterActor *stage,
GTask *result)
{
ShellScreenshot *screenshot = g_task_get_source_object (result);
ShellScreenshotPrivate *priv = screenshot->priv;
GTask *task;
MetaDisplay *display = shell_global_get_display (priv->global);
MetaWindow *window = meta_display_get_focus_window (display);
ClutterActor *window_actor;
gfloat actor_x, actor_y;
MetaShapedTexture *stex;
MetaRectangle rect;
cairo_rectangle_int_t clip;
window_actor = CLUTTER_ACTOR (meta_window_get_compositor_private (window));
clutter_actor_get_position (window_actor, &actor_x, &actor_y);
meta_window_get_frame_rect (window, &rect);
if (!priv->include_frame)
meta_window_frame_rect_to_client_rect (window, &rect, &rect);
priv->screenshot_area.x = rect.x;
priv->screenshot_area.y = rect.y;
clip.x = rect.x - (gint) actor_x;
clip.y = rect.y - (gint) actor_y;
clip.width = priv->screenshot_area.width = rect.width;
clip.height = priv->screenshot_area.height = rect.height;
stex = META_SHAPED_TEXTURE (meta_window_actor_get_texture (META_WINDOW_ACTOR (window_actor)));
priv->image = meta_shaped_texture_get_image (stex, &clip);
priv->datetime = g_date_time_new_now_local ();
if (priv->include_cursor)
{
if (meta_window_get_client_type (window) == META_WINDOW_CLIENT_TYPE_WAYLAND)
{
float resource_scale;
if (!clutter_actor_get_resource_scale (window_actor, &resource_scale))
resource_scale = 1.0f;
cairo_surface_set_device_scale (priv->image, resource_scale, resource_scale);
}
draw_cursor_image (priv->image, priv->screenshot_area);
}
g_signal_handlers_disconnect_by_func (stage, grab_window_screenshot, result);
task = g_task_new (screenshot, NULL, on_screenshot_written, result);
g_task_run_in_thread (task, write_screenshot_thread);
g_object_unref (task);
}
static void
grab_pixel (ClutterActor *stage,
GTask *result)
{
ShellScreenshot *screenshot = g_task_get_source_object (result);
ShellScreenshotPrivate *priv = screenshot->priv;
do_grab_screenshot (screenshot,
CLUTTER_STAGE (stage),
priv->screenshot_area.x,
priv->screenshot_area.y,
1,
1);
meta_enable_unredirect_for_display (shell_global_get_display (priv->global));
g_signal_handlers_disconnect_by_func (stage, grab_pixel, result);
g_task_return_boolean (result, TRUE);
g_object_unref (result);
}
static gboolean
finish_screenshot (ShellScreenshot *screenshot,
GAsyncResult *result,
cairo_rectangle_int_t **area,
const char **filename_used,
GError **error)
{
ShellScreenshotPrivate *priv = screenshot->priv;
if (!g_task_propagate_boolean (G_TASK (result), error))
return FALSE;
if (area)
*area = &priv->screenshot_area;
if (filename_used)
*filename_used = priv->filename_used;
return TRUE;
}
/**
* shell_screenshot_screenshot:
* @screenshot: the #ShellScreenshot
* @include_cursor: Whether to include the cursor or not
* @filename: The filename for the screenshot
* @callback: (scope async): function to call returning success or failure
* of the async grabbing
* @user_data: the data to pass to callback function
*
* Takes a screenshot of the whole screen
* in @filename as png image.
*
*/
void
shell_screenshot_screenshot (ShellScreenshot *screenshot,
gboolean include_cursor,
const char *filename,
GAsyncReadyCallback callback,
gpointer user_data)
{
ClutterActor *stage;
ShellScreenshotPrivate *priv = screenshot->priv;
const char *paint_signal;
GTask *result;
if (priv->filename != NULL) {
if (callback)
g_task_report_new_error (screenshot,
callback,
user_data,
shell_screenshot_screenshot,
G_IO_ERROR,
G_IO_ERROR_PENDING,
"Only one screenshot operation at a time "
"is permitted");
return;
}
result = g_task_new (screenshot, NULL, callback, user_data);
g_task_set_source_tag (result, shell_screenshot_screenshot);
priv->filename = g_strdup (filename);
priv->include_cursor = FALSE;
stage = CLUTTER_ACTOR (shell_global_get_stage (priv->global));
paint_signal = "actors-painted";
meta_disable_unredirect_for_display (shell_global_get_display (priv->global));
if (include_cursor)
{
if (should_draw_cursor_image (SHELL_SCREENSHOT_SCREEN))
priv->include_cursor = TRUE;
else
paint_signal = "paint";
}
g_signal_connect_after (stage, paint_signal, G_CALLBACK (grab_screenshot), result);
clutter_actor_queue_redraw (stage);
}
/**
* shell_screenshot_screenshot_finish:
* @screenshot: the #ShellScreenshot
* @result: the #GAsyncResult that was provided to the callback
* @area: (out) (transfer none): the area that was grabbed in screen coordinates
* @filename_used: (out) (transfer none): the name of the file the screenshot
* was written to
* @error: #GError for error reporting
*
* Finish the asynchronous operation started by shell_screenshot_screenshot()
* and obtain its result.
*
* Returns: whether the operation was successful
*
*/
gboolean
shell_screenshot_screenshot_finish (ShellScreenshot *screenshot,
GAsyncResult *result,
cairo_rectangle_int_t **area,
const char **filename_used,
GError **error)
{
g_return_val_if_fail (g_async_result_is_tagged (result,
shell_screenshot_screenshot),
FALSE);
return finish_screenshot (screenshot, result, area, filename_used, error);
}
/**
* shell_screenshot_screenshot_area:
* @screenshot: the #ShellScreenshot
* @x: The X coordinate of the area
* @y: The Y coordinate of the area
* @width: The width of the area
* @height: The height of the area
* @filename: The filename for the screenshot
* @callback: (scope async): function to call returning success or failure
* of the async grabbing
* @user_data: the data to pass to callback function
*
* Takes a screenshot of the passed in area and saves it
* in @filename as png image.
*
*/
void
shell_screenshot_screenshot_area (ShellScreenshot *screenshot,
int x,
int y,
int width,
int height,
const char *filename,
GAsyncReadyCallback callback,
gpointer user_data)
{
ClutterActor *stage;
ShellScreenshotPrivate *priv = screenshot->priv;
GTask *result;
if (priv->filename != NULL) {
if (callback)
g_task_report_new_error (screenshot,
callback,
NULL,
shell_screenshot_screenshot_area,
G_IO_ERROR,
G_IO_ERROR_PENDING,
"Only one screenshot operation at a time "
"is permitted");
return;
}
result = g_task_new (screenshot, NULL, callback, user_data);
g_task_set_source_tag (result, shell_screenshot_screenshot_area);
priv->filename = g_strdup (filename);
priv->screenshot_area.x = x;
priv->screenshot_area.y = y;
priv->screenshot_area.width = width;
priv->screenshot_area.height = height;
stage = CLUTTER_ACTOR (shell_global_get_stage (priv->global));
meta_disable_unredirect_for_display (shell_global_get_display (shell_global_get ()));
g_signal_connect_after (stage, "actors-painted", G_CALLBACK (grab_area_screenshot), result);
clutter_actor_queue_redraw (stage);
}
/**
* shell_screenshot_screenshot_area_finish:
* @screenshot: the #ShellScreenshot
* @result: the #GAsyncResult that was provided to the callback
* @area: (out) (transfer none): the area that was grabbed in screen coordinates
* @filename_used: (out) (transfer none): the name of the file the screenshot
* was written to
* @error: #GError for error reporting
*
* Finish the asynchronous operation started by shell_screenshot_screenshot_area()
* and obtain its result.
*
* Returns: whether the operation was successful
*
*/
gboolean
shell_screenshot_screenshot_area_finish (ShellScreenshot *screenshot,
GAsyncResult *result,
cairo_rectangle_int_t **area,
const char **filename_used,
GError **error)
{
g_return_val_if_fail (g_async_result_is_tagged (result,
shell_screenshot_screenshot_area),
FALSE);
return finish_screenshot (screenshot, result, area, filename_used, error);
}
/**
* shell_screenshot_screenshot_window:
* @screenshot: the #ShellScreenshot
* @include_frame: Whether to include the frame or not
* @include_cursor: Whether to include the cursor or not
* @filename: The filename for the screenshot
* @callback: (scope async): function to call returning success or failure
* of the async grabbing
* @user_data: the data to pass to callback function
*
* Takes a screenshot of the focused window (optionally omitting the frame)
* in @filename as png image.
*
*/
void
shell_screenshot_screenshot_window (ShellScreenshot *screenshot,
gboolean include_frame,
gboolean include_cursor,
const char *filename,
GAsyncReadyCallback callback,
gpointer user_data)
{
ShellScreenshotPrivate *priv = screenshot->priv;
MetaDisplay *display = shell_global_get_display (priv->global);
ClutterActor *stage;
MetaWindow *window = meta_display_get_focus_window (display);
GTask *result;
if (priv->filename != NULL || !window) {
if (callback)
g_task_report_new_error (screenshot,
callback,
NULL,
shell_screenshot_screenshot_window,
G_IO_ERROR,
G_IO_ERROR_PENDING,
"Only one screenshot operation at a time "
"is permitted");
return;
}
result = g_task_new (screenshot, NULL, callback, user_data);
g_task_set_source_tag (result, shell_screenshot_screenshot_window);
priv->filename = g_strdup (filename);
priv->include_frame = include_frame;
priv->include_cursor = include_cursor &&
should_draw_cursor_image (SHELL_SCREENSHOT_WINDOW);
stage = CLUTTER_ACTOR (shell_global_get_stage (priv->global));
meta_disable_unredirect_for_display (shell_global_get_display (shell_global_get ()));
g_signal_connect_after (stage, "actors-painted", G_CALLBACK (grab_window_screenshot), result);
clutter_actor_queue_redraw (stage);
}
/**
* shell_screenshot_screenshot_window_finish:
* @screenshot: the #ShellScreenshot
* @result: the #GAsyncResult that was provided to the callback
* @area: (out) (transfer none): the area that was grabbed in screen coordinates
* @filename_used: (out) (transfer none): the name of the file the screenshot
* was written to
* @error: #GError for error reporting
*
* Finish the asynchronous operation started by shell_screenshot_screenshot_window()
* and obtain its result.
*
* Returns: whether the operation was successful
*
*/
gboolean
shell_screenshot_screenshot_window_finish (ShellScreenshot *screenshot,
GAsyncResult *result,
cairo_rectangle_int_t **area,
const char **filename_used,
GError **error)
{
g_return_val_if_fail (g_async_result_is_tagged (result,
shell_screenshot_screenshot_window),
FALSE);
return finish_screenshot (screenshot, result, area, filename_used, error);
}
/**
* shell_screenshot_pick_color:
* @screenshot: the #ShellScreenshot
* @x: The X coordinate to pick
* @y: The Y coordinate to pick
* @callback: (scope async): function to call returning success or failure
* of the async grabbing
*
* Picks the pixel at @x, @y and returns its color as #ClutterColor.
*
*/
void
shell_screenshot_pick_color (ShellScreenshot *screenshot,
int x,
int y,
GAsyncReadyCallback callback,
gpointer user_data)
{
ShellScreenshotPrivate *priv = screenshot->priv;
MetaDisplay *display = shell_global_get_display (priv->global);
ClutterActor *stage;
GTask *result;
result = g_task_new (screenshot, NULL, callback, user_data);
g_task_set_source_tag (result, shell_screenshot_pick_color);
priv->screenshot_area.x = x;
priv->screenshot_area.y = y;
priv->screenshot_area.width = 1;
priv->screenshot_area.height = 1;
stage = CLUTTER_ACTOR (shell_global_get_stage (priv->global));
meta_disable_unredirect_for_display (display);
g_signal_connect_after (stage, "actors-painted", G_CALLBACK (grab_pixel), result);
clutter_actor_queue_redraw (stage);
}
#if G_BYTE_ORDER == G_LITTLE_ENDIAN
#define INDEX_A 3
#define INDEX_R 2
#define INDEX_G 1
#define INDEX_B 0
#else
#define INDEX_A 0
#define INDEX_R 1
#define INDEX_G 2
#define INDEX_B 3
#endif
/**
* shell_screenshot_pick_color_finish:
* @screenshot: the #ShellScreenshot
* @result: the #GAsyncResult that was provided to the callback
* @color: (out caller-allocates): the picked color
* @error: #GError for error reporting
*
* Finish the asynchronous operation started by shell_screenshot_pick_color()
* and obtain its result.
*
* Returns: whether the operation was successful
*
*/
gboolean
shell_screenshot_pick_color_finish (ShellScreenshot *screenshot,
GAsyncResult *result,
ClutterColor *color,
GError **error)
{
ShellScreenshotPrivate *priv = screenshot->priv;
g_return_val_if_fail (g_async_result_is_tagged (result,
shell_screenshot_pick_color),
FALSE);
if (!g_task_propagate_boolean (G_TASK (result), error))
return FALSE;
/* protect against mutter changing the format used for stage captures */
g_assert (cairo_image_surface_get_format (priv->image) == CAIRO_FORMAT_ARGB32);
if (color)
{
uint8_t *data = cairo_image_surface_get_data (priv->image);
color->alpha = data[INDEX_A];
color->red = data[INDEX_R];
color->green = data[INDEX_G];
color->blue = data[INDEX_B];
}
return TRUE;
}
#undef INDEX_A
#undef INDEX_R
#undef INDEX_G
#undef INDEX_B
ShellScreenshot *
shell_screenshot_new (void)
{
return g_object_new (SHELL_TYPE_SCREENSHOT, NULL);
}