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gnome-shell/src/shell-screenshot.c
LuK1337 1989a2f9f9 screenshot: Grab screenshot during paint on X11 for area type too 
Turns out that shell_screenshot_screenshot_area was affected
by the same issue that shell_screenshot_screenshot used to have.
Adapting code changes from commit id c09be8b0:
"screenshot: Grab screenshot during paint on X11" fixes it.

Part-of: <https://gitlab.gnome.org/GNOME/gnome-shell/-/merge_requests/1549>
2020-12-27 22:17:48 +00:00

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25 KiB
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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-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;
graphene_point_t point;
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, &point, NULL);
x = point.x;
y = point.y;
if (!cairo_region_contains_point (screenshot_region, point.x, point.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);
}
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