summaryrefslogtreecommitdiffstats
path: root/src/shell-screenshot.c
diff options
context:
space:
mode:
Diffstat (limited to 'src/shell-screenshot.c')
-rw-r--r--src/shell-screenshot.c780
1 files changed, 780 insertions, 0 deletions
diff --git a/src/shell-screenshot.c b/src/shell-screenshot.c
new file mode 100644
index 0000000..135ac55
--- /dev/null
+++ b/src/shell-screenshot.c
@@ -0,0 +1,780 @@
+/* -*- 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-cursor-tracker.h>
+#include <st/st.h>
+
+#include "shell-global.h"
+#include "shell-screenshot.h"
+#include "shell-util.h"
+
+typedef enum _ShellScreenshotFlag
+{
+ SHELL_SCREENSHOT_FLAG_NONE,
+ SHELL_SCREENSHOT_FLAG_INCLUDE_CURSOR,
+} ShellScreenshotFlag;
+
+typedef enum _ShellScreenshotMode
+{
+ SHELL_SCREENSHOT_SCREEN,
+ SHELL_SCREENSHOT_WINDOW,
+ SHELL_SCREENSHOT_AREA,
+} ShellScreenshotMode;
+
+typedef struct _ShellScreenshotPrivate ShellScreenshotPrivate;
+
+struct _ShellScreenshot
+{
+ GObject parent_instance;
+
+ ShellScreenshotPrivate *priv;
+};
+
+struct _ShellScreenshotPrivate
+{
+ ShellGlobal *global;
+
+ GOutputStream *stream;
+ ShellScreenshotFlag flags;
+ ShellScreenshotMode mode;
+
+ GDateTime *datetime;
+
+ cairo_surface_t *image;
+ cairo_rectangle_int_t screenshot_area;
+
+ gboolean include_frame;
+};
+
+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
+on_screenshot_written (GObject *source,
+ GAsyncResult *task,
+ 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_object (&priv->stream);
+ g_clear_pointer (&priv->datetime, g_date_time_unref);
+}
+
+static void
+write_screenshot_thread (GTask *result,
+ gpointer object,
+ gpointer task_data,
+ GCancellable *cancellable)
+{
+ ShellScreenshot *screenshot = SHELL_SCREENSHOT (object);
+ ShellScreenshotPrivate *priv;
+ g_autoptr (GOutputStream) stream = NULL;
+ g_autoptr(GdkPixbuf) pixbuf = NULL;
+ g_autofree char *creation_time = NULL;
+ GError *error = NULL;
+
+ g_assert (screenshot != NULL);
+
+ priv = screenshot->priv;
+
+ stream = g_object_ref (priv->stream);
+
+ 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");
+
+ gdk_pixbuf_save_to_stream (pixbuf, stream, "png", NULL, &error,
+ "tEXt::Software", "gnome-screenshot",
+ "tEXt::Creation Time", creation_time,
+ NULL);
+
+ if (error)
+ g_task_return_error (result, error);
+ else
+ g_task_return_boolean (result, TRUE);
+}
+
+static void
+do_grab_screenshot (ShellScreenshot *screenshot,
+ int x,
+ int y,
+ int width,
+ int height,
+ ShellScreenshotFlag flags)
+{
+ ShellScreenshotPrivate *priv = screenshot->priv;
+ ClutterStage *stage = shell_global_get_stage (priv->global);
+ cairo_rectangle_int_t screenshot_rect = { x, y, width, height };
+ int image_width;
+ int image_height;
+ float scale;
+ cairo_surface_t *image;
+ ClutterPaintFlag paint_flags = CLUTTER_PAINT_FLAG_NONE;
+ g_autoptr (GError) error = NULL;
+
+ clutter_stage_get_capture_final_size (stage, &screenshot_rect,
+ &image_width,
+ &image_height,
+ &scale);
+ image = cairo_image_surface_create (CAIRO_FORMAT_ARGB32,
+ image_width, image_height);
+
+ if (flags & SHELL_SCREENSHOT_FLAG_INCLUDE_CURSOR)
+ paint_flags |= CLUTTER_PAINT_FLAG_FORCE_CURSORS;
+ else
+ paint_flags |= CLUTTER_PAINT_FLAG_NO_CURSORS;
+ if (!clutter_stage_paint_to_buffer (stage, &screenshot_rect, scale,
+ cairo_image_surface_get_data (image),
+ cairo_image_surface_get_stride (image),
+ CLUTTER_CAIRO_FORMAT_ARGB32,
+ paint_flags,
+ &error))
+ {
+ cairo_surface_destroy (image);
+ g_warning ("Failed to take screenshot: %s", error->message);
+ return;
+ }
+
+ priv->image = image;
+
+ priv->datetime = g_date_time_new_now_local ();
+}
+
+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 (ShellScreenshot *screenshot,
+ ShellScreenshotFlag flags,
+ GTask *result)
+{
+ ShellScreenshotPrivate *priv = screenshot->priv;
+ MetaDisplay *display;
+ int width, height;
+ GTask *task;
+
+ display = shell_global_get_display (priv->global);
+ meta_display_get_size (display, &width, &height);
+
+ do_grab_screenshot (screenshot,
+ 0, 0, width, height,
+ flags);
+
+ priv->screenshot_area.x = 0;
+ priv->screenshot_area.y = 0;
+ priv->screenshot_area.width = width;
+ priv->screenshot_area.height = height;
+
+ 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 (ShellScreenshot *screenshot,
+ ShellScreenshotFlag flags,
+ GTask *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;
+ MetaRectangle rect;
+
+ 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 = rect;
+
+ priv->image = meta_window_actor_get_image (META_WINDOW_ACTOR (window_actor),
+ NULL);
+
+ if (!priv->image)
+ {
+ g_task_report_new_error (screenshot, on_screenshot_written, result, NULL,
+ G_IO_ERROR, G_IO_ERROR_FAILED,
+ "Capturing window failed");
+ return;
+ }
+
+ priv->datetime = g_date_time_new_now_local ();
+
+ if (flags & SHELL_SCREENSHOT_FLAG_INCLUDE_CURSOR)
+ {
+ if (meta_window_get_client_type (window) == META_WINDOW_CLIENT_TYPE_WAYLAND)
+ {
+ float resource_scale;
+ resource_scale = clutter_actor_get_resource_scale (window_actor);
+
+ cairo_surface_set_device_scale (priv->image, resource_scale, resource_scale);
+ }
+
+ draw_cursor_image (priv->image, priv->screenshot_area);
+ }
+
+ task = g_task_new (screenshot, NULL, on_screenshot_written, result);
+ g_task_run_in_thread (task, write_screenshot_thread);
+ g_object_unref (task);
+}
+
+static gboolean
+finish_screenshot (ShellScreenshot *screenshot,
+ GAsyncResult *result,
+ cairo_rectangle_int_t **area,
+ GError **error)
+{
+ ShellScreenshotPrivate *priv = screenshot->priv;
+
+ if (!g_task_propagate_boolean (G_TASK (result), error))
+ return FALSE;
+
+ if (area)
+ *area = &priv->screenshot_area;
+
+ return TRUE;
+}
+
+static void
+on_after_paint (ClutterStage *stage,
+ ClutterStageView *view,
+ GTask *result)
+{
+ ShellScreenshot *screenshot = g_task_get_task_data (result);
+ ShellScreenshotPrivate *priv = screenshot->priv;
+ MetaDisplay *display = shell_global_get_display (priv->global);
+ GTask *task;
+
+ g_signal_handlers_disconnect_by_func (stage, on_after_paint, result);
+
+ if (priv->mode == SHELL_SCREENSHOT_AREA)
+ {
+ do_grab_screenshot (screenshot,
+ priv->screenshot_area.x,
+ priv->screenshot_area.y,
+ priv->screenshot_area.width,
+ priv->screenshot_area.height,
+ priv->flags);
+
+ task = g_task_new (screenshot, NULL, on_screenshot_written, result);
+ g_task_run_in_thread (task, write_screenshot_thread);
+ }
+ else
+ {
+ grab_screenshot (screenshot, priv->flags, result);
+ }
+
+ meta_enable_unredirect_for_display (display);
+}
+
+/**
+ * shell_screenshot_screenshot:
+ * @screenshot: the #ShellScreenshot
+ * @include_cursor: Whether to include the cursor or not
+ * @stream: The stream 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 @stream as png image.
+ *
+ */
+void
+shell_screenshot_screenshot (ShellScreenshot *screenshot,
+ gboolean include_cursor,
+ GOutputStream *stream,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ ShellScreenshotPrivate *priv;
+ GTask *result;
+ ShellScreenshotFlag flags;
+
+ g_return_if_fail (SHELL_IS_SCREENSHOT (screenshot));
+ g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
+
+ priv = screenshot->priv;
+
+ if (priv->stream != 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);
+ g_task_set_task_data (result, screenshot, NULL);
+
+ priv->stream = g_object_ref (stream);
+
+ flags = SHELL_SCREENSHOT_FLAG_NONE;
+ if (include_cursor)
+ flags |= SHELL_SCREENSHOT_FLAG_INCLUDE_CURSOR;
+
+ if (meta_is_wayland_compositor ())
+ {
+ grab_screenshot (screenshot, flags, result);
+ }
+ else
+ {
+ MetaDisplay *display = shell_global_get_display (priv->global);
+ ClutterStage *stage = shell_global_get_stage (priv->global);
+
+ meta_disable_unredirect_for_display (display);
+ clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
+ priv->flags = flags;
+ priv->mode = SHELL_SCREENSHOT_SCREEN;
+ g_signal_connect (stage, "after-paint",
+ G_CALLBACK (on_after_paint), result);
+ }
+}
+
+/**
+ * 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
+ * @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,
+ GError **error)
+{
+ g_return_val_if_fail (SHELL_IS_SCREENSHOT (screenshot), FALSE);
+ g_return_val_if_fail (G_IS_TASK (result), FALSE);
+ g_return_val_if_fail (g_async_result_is_tagged (result,
+ shell_screenshot_screenshot),
+ FALSE);
+ return finish_screenshot (screenshot, result, area, 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
+ * @stream: The stream 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 @stream as png image.
+ *
+ */
+void
+shell_screenshot_screenshot_area (ShellScreenshot *screenshot,
+ int x,
+ int y,
+ int width,
+ int height,
+ GOutputStream *stream,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ ShellScreenshotPrivate *priv;
+ GTask *result;
+ g_autoptr (GTask) task = NULL;
+
+ g_return_if_fail (SHELL_IS_SCREENSHOT (screenshot));
+ g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
+
+ priv = screenshot->priv;
+
+ if (priv->stream != 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);
+ g_task_set_task_data (result, screenshot, NULL);
+
+ priv->stream = g_object_ref (stream);
+ priv->screenshot_area.x = x;
+ priv->screenshot_area.y = y;
+ priv->screenshot_area.width = width;
+ priv->screenshot_area.height = height;
+
+
+ if (meta_is_wayland_compositor ())
+ {
+ do_grab_screenshot (screenshot,
+ priv->screenshot_area.x,
+ priv->screenshot_area.y,
+ priv->screenshot_area.width,
+ priv->screenshot_area.height,
+ SHELL_SCREENSHOT_FLAG_NONE);
+
+ task = g_task_new (screenshot, NULL, on_screenshot_written, result);
+ g_task_run_in_thread (task, write_screenshot_thread);
+ }
+ else
+ {
+ MetaDisplay *display = shell_global_get_display (priv->global);
+ ClutterStage *stage = shell_global_get_stage (priv->global);
+
+ meta_disable_unredirect_for_display (display);
+ clutter_actor_queue_redraw (CLUTTER_ACTOR (stage));
+ priv->flags = SHELL_SCREENSHOT_FLAG_NONE;
+ priv->mode = SHELL_SCREENSHOT_AREA;
+ g_signal_connect (stage, "after-paint",
+ G_CALLBACK (on_after_paint), result);
+ }
+}
+
+/**
+ * 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
+ * @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,
+ GError **error)
+{
+ g_return_val_if_fail (SHELL_IS_SCREENSHOT (screenshot), FALSE);
+ g_return_val_if_fail (G_IS_TASK (result), FALSE);
+ g_return_val_if_fail (g_async_result_is_tagged (result,
+ shell_screenshot_screenshot_area),
+ FALSE);
+ return finish_screenshot (screenshot, result, area, 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
+ * @stream: The stream 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 @stream as png image.
+ *
+ */
+void
+shell_screenshot_screenshot_window (ShellScreenshot *screenshot,
+ gboolean include_frame,
+ gboolean include_cursor,
+ GOutputStream *stream,
+ GAsyncReadyCallback callback,
+ gpointer user_data)
+{
+ ShellScreenshotPrivate *priv;
+ MetaDisplay *display;
+ MetaWindow *window;
+ GTask *result;
+
+ g_return_if_fail (SHELL_IS_SCREENSHOT (screenshot));
+ g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
+
+ priv = screenshot->priv;
+ display = shell_global_get_display (priv->global);
+ window = meta_display_get_focus_window (display);
+
+ if (priv->stream != 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->stream = g_object_ref (stream);
+ priv->include_frame = include_frame;
+
+ grab_window_screenshot (screenshot, include_cursor, result);
+}
+
+/**
+ * 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
+ * @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,
+ GError **error)
+{
+ g_return_val_if_fail (SHELL_IS_SCREENSHOT (screenshot), FALSE);
+ g_return_val_if_fail (G_IS_TASK (result), FALSE);
+ g_return_val_if_fail (g_async_result_is_tagged (result,
+ shell_screenshot_screenshot_window),
+ FALSE);
+ return finish_screenshot (screenshot, result, area, 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;
+ g_autoptr (GTask) result = NULL;
+
+ g_return_if_fail (SHELL_IS_SCREENSHOT (screenshot));
+
+ result = g_task_new (screenshot, NULL, callback, user_data);
+ g_task_set_source_tag (result, shell_screenshot_pick_color);
+
+ priv = screenshot->priv;
+
+ priv->screenshot_area.x = x;
+ priv->screenshot_area.y = y;
+ priv->screenshot_area.width = 1;
+ priv->screenshot_area.height = 1;
+
+ do_grab_screenshot (screenshot,
+ priv->screenshot_area.x,
+ priv->screenshot_area.y,
+ 1,
+ 1,
+ SHELL_SCREENSHOT_FLAG_NONE);
+
+ g_task_return_boolean (result, TRUE);
+}
+
+#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;
+
+ g_return_val_if_fail (SHELL_IS_SCREENSHOT (screenshot), FALSE);
+ g_return_val_if_fail (G_IS_TASK (result), FALSE);
+ g_return_val_if_fail (color != NULL, FALSE);
+ 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;
+
+ priv = screenshot->priv;
+
+ /* 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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-11-22 03:26:11 +0000