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Switch to ext-image-* protocols

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This commit is contained in:
Kirill Primak
2026-04-12 11:59:52 +03:00
parent 3189f7c769
commit 435de1c6b6
8 changed files with 139 additions and 292 deletions
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4
README.md
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@@ -1,7 +1,7 @@
# dulcepan
A screenshot tool for Wayland compositors. Requires wlr-screencopy-unstable-v1
support.
A screenshot tool for Wayland compositors. Requires ext-image-capture-source-v1
and ext-image-copy-capture-v1 support.
Discuss in [#eclairs on Libera.Chat].

2
meson.build
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@@ -43,7 +43,7 @@ add_project_arguments(cc.get_supported_arguments([
m = cc.find_library('m')
wayland_client = dependency('wayland-client')
wayland_protos = dependency('wayland-protocols')
wayland_protos = dependency('wayland-protocols', version: '>=1.37')
cairo = dependency('cairo')
pixman = dependency('pixman-1')

11
protocols/meson.build
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@@ -14,12 +14,17 @@ wayland_scanner_client = generator(
)
client_protocols = [
wl_protocol_dir / 'stable/tablet/tablet-v2.xml', # cursor-shape dependency
# cursor-shape-v1 dependency
wl_protocol_dir / 'stable/tablet/tablet-v2.xml',
wl_protocol_dir / 'stable/viewporter/viewporter.xml',
wl_protocol_dir / 'stable/xdg-shell/xdg-shell.xml', # layer-shell dependency
# wlr-layer-shell-unstable-v1 dependency
wl_protocol_dir / 'stable/xdg-shell/xdg-shell.xml',
wl_protocol_dir / 'staging/cursor-shape/cursor-shape-v1.xml',
# ext-image-capture-source-v1 dependency
wl_protocol_dir / 'staging/ext-foreign-toplevel-list/ext-foreign-toplevel-list-v1.xml',
wl_protocol_dir / 'staging/ext-image-capture-source/ext-image-capture-source-v1.xml',
wl_protocol_dir / 'staging/ext-image-copy-capture/ext-image-copy-capture-v1.xml',
'wlr-layer-shell-unstable-v1.xml',
'wlr-screencopy-unstable-v1.xml',
]
client_protos_src = []

232
protocols/wlr-screencopy-unstable-v1.xml
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@@ -1,232 +0,0 @@
<?xml version="1.0" encoding="UTF-8"?>
<protocol name="wlr_screencopy_unstable_v1">
<copyright>
Copyright © 2018 Simon Ser
Copyright © 2019 Andri Yngvason
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice (including the next
paragraph) shall be included in all copies or substantial portions of the
Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
</copyright>
<description summary="screen content capturing on client buffers">
This protocol allows clients to ask the compositor to copy part of the
screen content to a client buffer.
Warning! The protocol described in this file is experimental and
backward incompatible changes may be made. Backward compatible changes
may be added together with the corresponding interface version bump.
Backward incompatible changes are done by bumping the version number in
the protocol and interface names and resetting the interface version.
Once the protocol is to be declared stable, the 'z' prefix and the
version number in the protocol and interface names are removed and the
interface version number is reset.
</description>
<interface name="zwlr_screencopy_manager_v1" version="3">
<description summary="manager to inform clients and begin capturing">
This object is a manager which offers requests to start capturing from a
source.
</description>
<request name="capture_output">
<description summary="capture an output">
Capture the next frame of an entire output.
</description>
<arg name="frame" type="new_id" interface="zwlr_screencopy_frame_v1"/>
<arg name="overlay_cursor" type="int"
summary="composite cursor onto the frame"/>
<arg name="output" type="object" interface="wl_output"/>
</request>
<request name="capture_output_region">
<description summary="capture an output's region">
Capture the next frame of an output's region.
The region is given in output logical coordinates, see
xdg_output.logical_size. The region will be clipped to the output's
extents.
</description>
<arg name="frame" type="new_id" interface="zwlr_screencopy_frame_v1"/>
<arg name="overlay_cursor" type="int"
summary="composite cursor onto the frame"/>
<arg name="output" type="object" interface="wl_output"/>
<arg name="x" type="int"/>
<arg name="y" type="int"/>
<arg name="width" type="int"/>
<arg name="height" type="int"/>
</request>
<request name="destroy" type="destructor">
<description summary="destroy the manager">
All objects created by the manager will still remain valid, until their
appropriate destroy request has been called.
</description>
</request>
</interface>
<interface name="zwlr_screencopy_frame_v1" version="3">
<description summary="a frame ready for copy">
This object represents a single frame.
When created, a series of buffer events will be sent, each representing a
supported buffer type. The "buffer_done" event is sent afterwards to
indicate that all supported buffer types have been enumerated. The client
will then be able to send a "copy" request. If the capture is successful,
the compositor will send a "flags" followed by a "ready" event.
For objects version 2 or lower, wl_shm buffers are always supported, ie.
the "buffer" event is guaranteed to be sent.
If the capture failed, the "failed" event is sent. This can happen anytime
before the "ready" event.
Once either a "ready" or a "failed" event is received, the client should
destroy the frame.
</description>
<event name="buffer">
<description summary="wl_shm buffer information">
Provides information about wl_shm buffer parameters that need to be
used for this frame. This event is sent once after the frame is created
if wl_shm buffers are supported.
</description>
<arg name="format" type="uint" enum="wl_shm.format" summary="buffer format"/>
<arg name="width" type="uint" summary="buffer width"/>
<arg name="height" type="uint" summary="buffer height"/>
<arg name="stride" type="uint" summary="buffer stride"/>
</event>
<request name="copy">
<description summary="copy the frame">
Copy the frame to the supplied buffer. The buffer must have a the
correct size, see zwlr_screencopy_frame_v1.buffer and
zwlr_screencopy_frame_v1.linux_dmabuf. The buffer needs to have a
supported format.
If the frame is successfully copied, a "flags" and a "ready" events are
sent. Otherwise, a "failed" event is sent.
</description>
<arg name="buffer" type="object" interface="wl_buffer"/>
</request>
<enum name="error">
<entry name="already_used" value="0"
summary="the object has already been used to copy a wl_buffer"/>
<entry name="invalid_buffer" value="1"
summary="buffer attributes are invalid"/>
</enum>
<enum name="flags" bitfield="true">
<entry name="y_invert" value="1" summary="contents are y-inverted"/>
</enum>
<event name="flags">
<description summary="frame flags">
Provides flags about the frame. This event is sent once before the
"ready" event.
</description>
<arg name="flags" type="uint" enum="flags" summary="frame flags"/>
</event>
<event name="ready">
<description summary="indicates frame is available for reading">
Called as soon as the frame is copied, indicating it is available
for reading. This event includes the time at which presentation happened
at.
The timestamp is expressed as tv_sec_hi, tv_sec_lo, tv_nsec triples,
each component being an unsigned 32-bit value. Whole seconds are in
tv_sec which is a 64-bit value combined from tv_sec_hi and tv_sec_lo,
and the additional fractional part in tv_nsec as nanoseconds. Hence,
for valid timestamps tv_nsec must be in [0, 999999999]. The seconds part
may have an arbitrary offset at start.
After receiving this event, the client should destroy the object.
</description>
<arg name="tv_sec_hi" type="uint"
summary="high 32 bits of the seconds part of the timestamp"/>
<arg name="tv_sec_lo" type="uint"
summary="low 32 bits of the seconds part of the timestamp"/>
<arg name="tv_nsec" type="uint"
summary="nanoseconds part of the timestamp"/>
</event>
<event name="failed">
<description summary="frame copy failed">
This event indicates that the attempted frame copy has failed.
After receiving this event, the client should destroy the object.
</description>
</event>
<request name="destroy" type="destructor">
<description summary="delete this object, used or not">
Destroys the frame. This request can be sent at any time by the client.
</description>
</request>
<!-- Version 2 additions -->
<request name="copy_with_damage" since="2">
<description summary="copy the frame when it's damaged">
Same as copy, except it waits until there is damage to copy.
</description>
<arg name="buffer" type="object" interface="wl_buffer"/>
</request>
<event name="damage" since="2">
<description summary="carries the coordinates of the damaged region">
This event is sent right before the ready event when copy_with_damage is
requested. It may be generated multiple times for each copy_with_damage
request.
The arguments describe a box around an area that has changed since the
last copy request that was derived from the current screencopy manager
instance.
The union of all regions received between the call to copy_with_damage
and a ready event is the total damage since the prior ready event.
</description>
<arg name="x" type="uint" summary="damaged x coordinates"/>
<arg name="y" type="uint" summary="damaged y coordinates"/>
<arg name="width" type="uint" summary="current width"/>
<arg name="height" type="uint" summary="current height"/>
</event>
<!-- Version 3 additions -->
<event name="linux_dmabuf" since="3">
<description summary="linux-dmabuf buffer information">
Provides information about linux-dmabuf buffer parameters that need to
be used for this frame. This event is sent once after the frame is
created if linux-dmabuf buffers are supported.
</description>
<arg name="format" type="uint" summary="fourcc pixel format"/>
<arg name="width" type="uint" summary="buffer width"/>
<arg name="height" type="uint" summary="buffer height"/>
</event>
<event name="buffer_done" since="3">
<description summary="all buffer types reported">
This event is sent once after all buffer events have been sent.
The client should proceed to create a buffer of one of the supported
types, and send a "copy" request.
</description>
</event>
</interface>
</protocol>

21
src/dulcepan.h
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@@ -6,6 +6,7 @@
#include <stdbool.h>
#include <stddef.h>
#include <stdnoreturn.h>
#include <wayland-client-protocol.h>
#include <wayland-util.h>
#include <xkbcommon/xkbcommon.h>
@@ -60,17 +61,19 @@ struct dp_output {
struct wl_callback *redraw_callback;
bool needs_redraw;
struct zwlr_screencopy_frame_v1 *frame;
bool has_frame;
// XXX: this is completely untested
bool y_invert;
struct ext_image_capture_source_v1 *source;
struct ext_image_copy_capture_session_v1 *session;
struct ext_image_copy_capture_frame_v1 *frame;
enum wl_shm_format frame_format;
bool has_frame_format;
struct wl_buffer *frame_buffer;
int32_t frame_stride;
uint32_t frame_format;
void *frame_data;
size_t frame_size;
bool captured;
// wl_buffer is NULL if uninitialized
struct dp_buffer swapchain[DP_SWAPCHAIN_LEN];
@@ -186,7 +189,9 @@ struct dp_state {
struct wp_viewporter *viewporter;
struct wl_shm *shm;
struct zwlr_layer_shell_v1 *layer_shell;
struct zwlr_screencopy_manager_v1 *screencopy_manager;
struct ext_output_image_capture_source_manager_v1 *output_image_capture_source_manager;
struct ext_image_copy_capture_manager_v1 *image_copy_capture_manager;
// Optional
struct wp_cursor_shape_manager_v1 *cursor_shape_manager;
@@ -242,6 +247,8 @@ void dp_select_notify_pointer_position(
void dp_select_toggle_whole(struct dp_selection *selection, struct dp_output *output);
bool dp_format_supported(enum wl_shm_format format);
void dp_save(struct dp_state *state);
void dp_log_error(const char *fmt, ...);

22
src/main.c
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@@ -8,9 +8,10 @@
#include "cursor-shape-v1-protocol.h"
#include "dulcepan.h"
#include "ext-image-capture-source-v1-protocol.h"
#include "ext-image-copy-capture-v1-protocol.h"
#include "viewporter-protocol.h"
#include "wlr-layer-shell-unstable-v1-protocol.h"
#include "wlr-screencopy-unstable-v1-protocol.h"
static void registry_handle_global(void *data, struct wl_registry *registry, uint32_t name,
const char *interface, uint32_t version) {
@@ -27,9 +28,12 @@ static void registry_handle_global(void *data, struct wl_registry *registry, uin
state->shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
} else if (strcmp(interface, zwlr_layer_shell_v1_interface.name) == 0) {
state->layer_shell = wl_registry_bind(registry, name, &zwlr_layer_shell_v1_interface, 1);
} else if (strcmp(interface, zwlr_screencopy_manager_v1_interface.name) == 0) {
state->screencopy_manager =
wl_registry_bind(registry, name, &zwlr_screencopy_manager_v1_interface, 1);
} else if (strcmp(interface, ext_output_image_capture_source_manager_v1_interface.name) == 0) {
state->output_image_capture_source_manager = wl_registry_bind(
registry, name, &ext_output_image_capture_source_manager_v1_interface, 1);
} else if (strcmp(interface, ext_image_copy_capture_manager_v1_interface.name) == 0) {
state->image_copy_capture_manager =
wl_registry_bind(registry, name, &ext_image_copy_capture_manager_v1_interface, 1);
} else if (strcmp(interface, wp_cursor_shape_manager_v1_interface.name) == 0) {
state->cursor_shape_manager =
wl_registry_bind(registry, name, &wp_cursor_shape_manager_v1_interface, 1);
@@ -88,8 +92,10 @@ static void run(struct dp_state *state) {
dp_log_fatal("The compositor has no wl_shm");
} else if (state->layer_shell == NULL) {
dp_log_fatal("The compositor has no zwlr_layer_shell_v1");
} else if (state->screencopy_manager == NULL) {
dp_log_fatal("The compositor has no zwlr_screencopy_manager_v1");
} else if (state->output_image_capture_source_manager == NULL) {
dp_log_fatal("The compositor has no ext_output_image_capture_source_manager_v1");
} else if (state->image_copy_capture_manager == NULL) {
dp_log_fatal("The compositor has no ext_image_copy_capture_manager_v1");
}
if (wl_list_empty(&state->outputs)) {
@@ -148,7 +154,9 @@ static void run(struct dp_state *state) {
wp_viewporter_destroy(state->viewporter);
wl_shm_destroy(state->shm);
zwlr_layer_shell_v1_destroy(state->layer_shell);
zwlr_screencopy_manager_v1_destroy(state->screencopy_manager);
ext_output_image_capture_source_manager_v1_destroy(state->output_image_capture_source_manager);
ext_image_copy_capture_manager_v1_destroy(state->image_copy_capture_manager);
if (state->cursor_shape_manager) {
wp_cursor_shape_manager_v1_destroy(state->cursor_shape_manager);

129
src/output.c
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@@ -5,14 +5,17 @@
#include <wayland-client-protocol.h>
#include "dulcepan.h"
#include "ext-image-capture-source-v1-protocol.h"
#include "ext-image-copy-capture-v1-protocol.h"
#include "viewporter-protocol.h"
#include "wlr-layer-shell-unstable-v1-protocol.h"
#include "wlr-screencopy-unstable-v1-protocol.h"
// Initialiation flow:
// - Wait for mode+transform info
// - Wait for done, compute transformed size
// - Prepare surfaces, get a frame, wait for it to be ready
// - Wait for the output configuration, compute transformed size
// - Create a source, a session, and a frame
// - Create and prepare surfaces
// - Wait for the session information, capture the frame
// - Wait for the frame
// - Commit the main surface, wait for a configure event
// - Save effective size, put the frame buffer on the main surface
// - The output is initialized
@@ -21,7 +24,7 @@ static void layer_surface_handle_configure(void *data, struct zwlr_layer_surface
uint32_t serial, uint32_t width, uint32_t height) {
struct dp_output *output = data;
if (!output->has_frame) {
if (!output->captured) {
// Ignore configures that came too early
return;
}
@@ -51,10 +54,6 @@ static void layer_surface_handle_configure(void *data, struct zwlr_layer_surface
wp_viewport_set_destination(
output->select_viewport, output->effective_width, output->effective_height);
if (output->y_invert) {
wl_surface_set_buffer_transform(output->main_surface, WL_OUTPUT_TRANSFORM_FLIPPED_180);
}
wl_surface_attach(output->main_surface, output->frame_buffer, 0, 0);
wl_surface_commit(output->main_surface);
@@ -71,54 +70,100 @@ static const struct zwlr_layer_surface_v1_listener layer_surface_listener = {
.closed = layer_surface_handle_closed,
};
static void frame_handle_buffer(void *data, struct zwlr_screencopy_frame_v1 *frame, uint32_t format,
uint32_t width, uint32_t height, uint32_t stride) {
static void session_handle_buffer_size(void *data,
struct ext_image_copy_capture_session_v1 *session, uint32_t width, uint32_t height) {
struct dp_output *output = data;
if (output->frame_buffer != NULL) {
wl_buffer_destroy(output->frame_buffer);
}
if ((int32_t)width != output->width || (int32_t)height != output->height) {
dp_log_fatal("Output/buffer size mismatch: mode=%" PRIi32 "x%" PRIi32 ", buffer=%" PRIu32
"x%" PRIu32,
output->width, output->height, width, height);
}
output->frame_format = format;
output->frame_stride = (int)stride;
output->frame_buffer = dp_buffer_create(output->state, output->width, output->height,
output->frame_stride, output->frame_format, &output->frame_data, &output->frame_size);
zwlr_screencopy_frame_v1_copy(output->frame, output->frame_buffer);
}
static void frame_handle_flags(void *data, struct zwlr_screencopy_frame_v1 *frame, uint32_t flags) {
static void session_handle_shm_format(
void *data, struct ext_image_copy_capture_session_v1 *session, uint32_t format) {
struct dp_output *output = data;
if ((flags & ZWLR_SCREENCOPY_FRAME_V1_FLAGS_Y_INVERT) != 0) {
output->y_invert = true;
if (!output->has_frame_format && dp_format_supported(format)) {
output->frame_format = format;
output->has_frame_format = true;
}
}
static void frame_handle_ready(void *data, struct zwlr_screencopy_frame_v1 *frame,
uint32_t tv_sec_hi, uint32_t tv_sec_lo, uint32_t tv_nsec) {
static void session_handle_dmabuf_device(
void *data, struct ext_image_copy_capture_session_v1 *session, struct wl_array *device) {
// Ignored
}
static void session_handle_dmabuf_format(void *data,
struct ext_image_copy_capture_session_v1 *session, uint32_t format,
struct wl_array *modifiers) {
// Ignored
}
static void session_handle_done(void *data, struct ext_image_copy_capture_session_v1 *session) {
struct dp_output *output = data;
if (!output->has_frame_format) {
dp_log_fatal("Output %s: no suitable SHM format", output->name);
}
output->frame_buffer = dp_buffer_create(output->state, output->width, output->height,
output->width * 4, output->frame_format, &output->frame_data, &output->frame_size);
ext_image_copy_capture_frame_v1_attach_buffer(output->frame, output->frame_buffer);
ext_image_copy_capture_frame_v1_capture(output->frame);
}
static void session_handle_stopped(void *data, struct ext_image_copy_capture_session_v1 *session) {
// Ignored
}
static const struct ext_image_copy_capture_session_v1_listener session_listener = {
.buffer_size = session_handle_buffer_size,
.shm_format = session_handle_shm_format,
.dmabuf_device = session_handle_dmabuf_device,
.dmabuf_format = session_handle_dmabuf_format,
.done = session_handle_done,
.stopped = session_handle_stopped,
};
static void frame_handle_transform(
void *data, struct ext_image_copy_capture_frame_v1 *frame, uint32_t transform) {
// Ignored
}
static void frame_handle_damage(void *data, struct ext_image_copy_capture_frame_v1 *frame,
int32_t x, int32_t y, int32_t width, int32_t height) {
// Ignored
}
static void frame_handle_presentation_time(void *data,
struct ext_image_copy_capture_frame_v1 *frame, uint32_t tv_sec_hi, uint32_t tv_sec_lo,
uint32_t tv_nsec) {
// Ignored
}
static void frame_handle_ready(void *data, struct ext_image_copy_capture_frame_v1 *frame) {
struct dp_output *output = data;
zwlr_screencopy_frame_v1_destroy(output->frame);
ext_image_copy_capture_frame_v1_destroy(output->frame);
output->frame = NULL;
output->has_frame = true;
output->captured = true;
wl_surface_commit(output->main_surface);
}
static void frame_handle_failed(void *data, struct zwlr_screencopy_frame_v1 *frame) {
static void frame_handle_failed(
void *data, struct ext_image_copy_capture_frame_v1 *frame, uint32_t reason) {
// Shouldn't happen?
struct dp_output *output = data;
dp_log_fatal("Output %s: failed to copy a frame", output->name);
dp_log_fatal("Output %s: failed to capture a frame, reason %" PRIu32, output->name, reason);
}
static const struct zwlr_screencopy_frame_v1_listener frame_listener = {
.buffer = frame_handle_buffer,
.flags = frame_handle_flags,
static const struct ext_image_copy_capture_frame_v1_listener frame_listener = {
.transform = frame_handle_transform,
.damage = frame_handle_damage,
.presentation_time = frame_handle_presentation_time,
.ready = frame_handle_ready,
.failed = frame_handle_failed,
};
@@ -201,9 +246,16 @@ static void output_handle_done(void *data, struct wl_output *wl_output) {
struct dp_state *state = output->state;
output->frame = zwlr_screencopy_manager_v1_capture_output(
state->screencopy_manager, state->show_cursors, output->wl_output);
zwlr_screencopy_frame_v1_add_listener(output->frame, &frame_listener, output);
output->source = ext_output_image_capture_source_manager_v1_create_source(
state->output_image_capture_source_manager, output->wl_output);
output->session =
ext_image_copy_capture_manager_v1_create_session(state->image_copy_capture_manager,
output->source, EXT_IMAGE_COPY_CAPTURE_MANAGER_V1_OPTIONS_PAINT_CURSORS);
ext_image_copy_capture_session_v1_add_listener(output->session, &session_listener, output);
output->frame = ext_image_copy_capture_session_v1_create_frame(output->session);
ext_image_copy_capture_frame_v1_add_listener(output->frame, &frame_listener, output);
output->main_surface = wl_compositor_create_surface(state->compositor);
output->main_layer_surface = zwlr_layer_shell_v1_get_layer_surface(state->layer_shell,
@@ -459,6 +511,9 @@ void dp_output_destroy(struct dp_output *output) {
}
}
ext_image_copy_capture_session_v1_destroy(output->session);
ext_image_capture_source_v1_destroy(output->source);
wl_subsurface_destroy(output->select_subsurface);
wp_viewport_destroy(output->select_viewport);
wl_surface_destroy(output->select_surface);

10
src/save.c
View File

@@ -58,7 +58,7 @@ static pixman_format_code_t shm_to_pixman(enum wl_shm_format shm_format) {
return formats[i].pixman;
}
}
dp_log_fatal("failed to get a matching Pixman format for wl_shm format");
return 0;
}
static void write_png(FILE *fp, pixman_image_t *image, int width, int height, int level) {
@@ -106,6 +106,10 @@ static void write_ppm(FILE *fp, pixman_image_t *image, int width, int height) {
}
}
bool dp_format_supported(enum wl_shm_format format) {
return shm_to_pixman(format) != 0;
}
void dp_save(struct dp_state *state) {
struct dp_selection *selection = &state->selection;
struct dp_output *output = selection->output;
@@ -117,14 +121,14 @@ void dp_save(struct dp_state *state) {
pixman_format_code_t pixman_format = shm_to_pixman(output->frame_format);
pixman_image_t *frame_image = pixman_image_create_bits(
pixman_format, output->width, output->height, output->frame_data, output->frame_stride);
pixman_format, output->width, output->height, output->frame_data, output->width * 4);
static const pixman_fixed_t cosines[] = {pixman_fixed_1, 0, -pixman_fixed_1, 0};
pixman_fixed_t scale_x = (output->transform & WL_OUTPUT_TRANSFORM_FLIPPED) != 0
? -pixman_fixed_1
: pixman_fixed_1;
pixman_fixed_t scale_y = output->y_invert ? -pixman_fixed_1 : pixman_fixed_1;
pixman_fixed_t scale_y = pixman_fixed_1;
struct pixman_transform frame_transform;
pixman_transform_init_identity(&frame_transform);