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examples: Add screencopy-dmabuf example

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master
Andri Yngvason 5 years ago committed by Simon Ser
parent ea83957ecc
commit e0d4f75172
2 changed files with 370 additions and 0 deletions
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8
examples/meson.build
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@ -127,6 +127,14 @@ clients = {
'dep': [libpng, rt],
'proto': ['wlr-screencopy-unstable-v1'],
},
'screencopy-dmabuf': {
'src': 'screencopy-dmabuf.c',
'dep': [libpng, rt, gbm, drm],
'proto': [
'wlr-screencopy-unstable-v1',
'linux-dmabuf-unstable-v1',
],
},
'toplevel-decoration': {
'src': 'toplevel-decoration.c',
'dep': wlroots,

362
examples/screencopy-dmabuf.c
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@ -0,0 +1,362 @@
/*
* Copyright © 2008 Kristian Høgsberg
* Copyright © 2020 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.
*/
#define _POSIX_C_SOURCE 200112L
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <png.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/mman.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/wait.h>
#include <unistd.h>
#include <assert.h>
#include <gbm.h>
#include <xf86drm.h>
#include <drm_fourcc.h>
#include <wayland-client-protocol.h>
#include "wlr-screencopy-unstable-v1-client-protocol.h"
#include "linux-dmabuf-unstable-v1-client-protocol.h"
struct format {
uint32_t format;
bool is_bgr;
};
static int drm_fd = -1;
static struct gbm_device *gbm_device = NULL;
static struct zwp_linux_dmabuf_v1 *dmabuf = NULL;
static struct zwlr_screencopy_manager_v1 *screencopy_manager = NULL;
static struct wl_output *output = NULL;
static struct {
struct gbm_bo *bo;
struct wl_buffer *wl_buffer;
int width, height;
uint32_t format;
bool y_invert;
} buffer;
bool buffer_copy_done = false;
static bool have_linux_dmabuf = false;
// wl_shm_format describes little-endian formats, libpng uses big-endian
// formats (so Wayland's ABGR is libpng's RGBA).
static const struct format formats[] = {
{DRM_FORMAT_XRGB8888, true},
{DRM_FORMAT_ARGB8888, true},
{DRM_FORMAT_XBGR8888, false},
{DRM_FORMAT_ABGR8888, false},
};
static bool find_render_node(char *node, size_t maxlen) {
bool r = false;
drmDevice *devices[64];
int n = drmGetDevices2(0, devices, sizeof(devices) / sizeof(devices[0]));
for (int i = 0; i < n; ++i) {
drmDevice *dev = devices[i];
if (!(dev->available_nodes & (1 << DRM_NODE_RENDER))) {
continue;
}
strncpy(node, dev->nodes[DRM_NODE_RENDER], maxlen);
node[maxlen - 1] = '\0';
r = true;
break;
}
drmFreeDevices(devices, n);
return r;
}
static void dmabuf_created(void *data,
struct zwp_linux_buffer_params_v1 *params,
struct wl_buffer *wl_buffer) {
buffer.wl_buffer = wl_buffer;
zwlr_screencopy_frame_v1_copy(data, buffer.wl_buffer);
}
static void dmabuf_failed(void *data,
struct zwp_linux_buffer_params_v1 *params) {
fprintf(stderr, "Failed to create dmabuf\n");
exit(EXIT_FAILURE);
}
static const struct zwp_linux_buffer_params_v1_listener params_listener = {
.created = dmabuf_created,
.failed = dmabuf_failed,
};
static void frame_handle_buffer(void *data,
struct zwlr_screencopy_frame_v1 *frame, uint32_t wl_format,
uint32_t width, uint32_t height, uint32_t stride) {
// Not implemented
}
static void frame_handle_linux_dmabuf(void *data,
struct zwlr_screencopy_frame_v1 *frame, uint32_t fourcc,
uint32_t width, uint32_t height) {
buffer.width = width;
buffer.height = height;
buffer.format = fourcc;
have_linux_dmabuf = true;
}
static void frame_handle_buffer_done(void *data,
struct zwlr_screencopy_frame_v1 *frame) {
assert(!buffer.bo);
if (!have_linux_dmabuf) {
fprintf(stderr, "linux-dmabuf is not supported\n");
exit(EXIT_FAILURE);
}
buffer.bo = gbm_bo_create(gbm_device, buffer.width, buffer.height,
buffer.format,
GBM_BO_USE_LINEAR | GBM_BO_USE_RENDERING);
if (buffer.bo == NULL) {
fprintf(stderr, "failed to create GBM buffer object\n");
exit(EXIT_FAILURE);
}
struct zwp_linux_buffer_params_v1 *params;
params = zwp_linux_dmabuf_v1_create_params(dmabuf);
assert(params);
int fd = gbm_bo_get_fd(buffer.bo);
uint32_t off = gbm_bo_get_offset(buffer.bo, 0);
uint32_t bo_stride = gbm_bo_get_stride(buffer.bo);
uint64_t mod = gbm_bo_get_modifier(buffer.bo);
zwp_linux_buffer_params_v1_add(params, fd, 0, off, bo_stride, mod >> 32,
mod & 0xffffffff);
zwp_linux_buffer_params_v1_add_listener(params, &params_listener, frame);
zwp_linux_buffer_params_v1_create(params, buffer.width, buffer.height,
buffer.format, /* flags */ 0);
}
static void frame_handle_flags(void *data,
struct zwlr_screencopy_frame_v1 *frame, uint32_t flags) {
buffer.y_invert = flags & ZWLR_SCREENCOPY_FRAME_V1_FLAGS_Y_INVERT;
}
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) {
buffer_copy_done = true;
}
static void frame_handle_failed(void *data,
struct zwlr_screencopy_frame_v1 *frame) {
fprintf(stderr, "failed to copy frame\n");
exit(EXIT_FAILURE);
}
static const struct zwlr_screencopy_frame_v1_listener frame_listener = {
.buffer = frame_handle_buffer,
.linux_dmabuf = frame_handle_linux_dmabuf,
.buffer_done = frame_handle_buffer_done,
.flags = frame_handle_flags,
.ready = frame_handle_ready,
.failed = frame_handle_failed,
};
static void dmabuf_format(void *data,
struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf, uint32_t format) {
// deprecated
}
static void dmabuf_modifier(void *data,
struct zwp_linux_dmabuf_v1 *zwp_linux_dmabuf, uint32_t format,
uint32_t modifier_hi, uint32_t modifier_lo) {
// TODO?
}
static const struct zwp_linux_dmabuf_v1_listener dmabuf_listener = {
.format = dmabuf_format,
.modifier = dmabuf_modifier,
};
static void handle_global(void *data, struct wl_registry *registry,
uint32_t name, const char *interface, uint32_t version) {
if (strcmp(interface, wl_output_interface.name) == 0 && output == NULL) {
output = wl_registry_bind(registry, name, &wl_output_interface, 1);
} else if (strcmp(interface, zwp_linux_dmabuf_v1_interface.name) == 0) {
dmabuf = wl_registry_bind(registry, name,
&zwp_linux_dmabuf_v1_interface, 3);
zwp_linux_dmabuf_v1_add_listener(dmabuf, &dmabuf_listener, data);
} else if (strcmp(interface,
zwlr_screencopy_manager_v1_interface.name) == 0) {
screencopy_manager = wl_registry_bind(registry, name,
&zwlr_screencopy_manager_v1_interface, 3);
}
}
static void handle_global_remove(void *data, struct wl_registry *registry,
uint32_t name) {
// Who cares?
}
static const struct wl_registry_listener registry_listener = {
.global = handle_global,
.global_remove = handle_global_remove,
};
static void write_image(char *filename, uint32_t format, int width,
int height, int stride, bool y_invert, png_bytep data) {
const struct format *fmt = NULL;
for (size_t i = 0; i < sizeof(formats) / sizeof(formats[0]); ++i) {
if (formats[i].format == format) {
fmt = &formats[i];
break;
}
}
if (fmt == NULL) {
fprintf(stderr, "unsupported format %"PRIu32"\n", format);
exit(EXIT_FAILURE);
}
FILE *f = fopen(filename, "wb");
if (f == NULL) {
fprintf(stderr, "failed to open output file\n");
exit(EXIT_FAILURE);
}
png_structp png =
png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
png_infop info = png_create_info_struct(png);
png_init_io(png, f);
png_set_IHDR(png, info, width, height, 8, PNG_COLOR_TYPE_RGBA,
PNG_INTERLACE_NONE, PNG_COMPRESSION_TYPE_DEFAULT,
PNG_FILTER_TYPE_DEFAULT);
if (fmt->is_bgr) {
png_set_bgr(png);
}
png_write_info(png, info);
for (size_t i = 0; i < (size_t)height; ++i) {
png_bytep row;
if (y_invert) {
row = data + (height - i - 1) * stride;
} else {
row = data + i * stride;
}
png_write_row(png, row);
}
png_write_end(png, NULL);
png_destroy_write_struct(&png, &info);
fclose(f);
}
int main(int argc, char *argv[]) {
char render_node[256];
if (!find_render_node(render_node, sizeof(render_node))) {
fprintf(stderr, "Failed to find a DRM render node\n");
return EXIT_FAILURE;
}
printf("Using render node: %s\n", render_node);
drm_fd = open(render_node, O_RDWR);
if (drm_fd < 0) {
fprintf(stderr, "Failed to open drm render node: %m\n");
return EXIT_FAILURE;
}
gbm_device = gbm_create_device(drm_fd);
if (!gbm_device) {
fprintf(stderr, "Failed to create gbm device\n");
return EXIT_FAILURE;
}
struct wl_display *display = wl_display_connect(NULL);
if (display == NULL) {
fprintf(stderr, "failed to create display: %m\n");
return EXIT_FAILURE;
}
struct wl_registry *registry = wl_display_get_registry(display);
wl_registry_add_listener(registry, &registry_listener, NULL);
wl_display_dispatch(display);
wl_display_roundtrip(display);
if (dmabuf == NULL) {
fprintf(stderr, "compositor is missing linux-dmabuf-unstable-v1\n");
return EXIT_FAILURE;
}
if (screencopy_manager == NULL) {
fprintf(stderr, "compositor doesn't support wlr-screencopy-unstable-v1\n");
return EXIT_FAILURE;
}
if (output == NULL) {
fprintf(stderr, "no output available\n");
return EXIT_FAILURE;
}
struct zwlr_screencopy_frame_v1 *frame =
zwlr_screencopy_manager_v1_capture_output(screencopy_manager, 0, output);
zwlr_screencopy_frame_v1_add_listener(frame, &frame_listener, NULL);
while (!buffer_copy_done && wl_display_dispatch(display) != -1) {
// This space is intentionally left blank
}
uint32_t stride = 0;
void *map_data = NULL;
void *data = gbm_bo_map(buffer.bo, 0, 0, buffer.width, buffer.height,
GBM_BO_TRANSFER_READ, &stride, &map_data);
if (!data) {
fprintf(stderr, "Failed to map gbm bo: %m\n");
return EXIT_FAILURE;
}
write_image("wayland-screenshot.png", buffer.format, buffer.width,
buffer.height, stride, !buffer.y_invert, data);
gbm_bo_unmap(buffer.bo, map_data);
gbm_bo_destroy(buffer.bo);
wl_buffer_destroy(buffer.wl_buffer);
gbm_device_destroy(gbm_device);
close(drm_fd);
return EXIT_SUCCESS;
}
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