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examples/screencopy: use libpng

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This commit is contained in:
emersion 2018-06-30 23:16:53 +01:00
parent dbb01cbcd0
commit a7a96d7644
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GPG Key ID: 0FDE7BE0E88F5E48
2 changed files with 58 additions and 59 deletions
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6
examples/meson.build
View File

@ -1,6 +1,8 @@
threads = dependency('threads')
wayland_cursor = dependency('wayland-cursor')
libpng = dependency('libpng', required: false)
# These versions correspond to ffmpeg 4.0
libavutil = dependency('libavutil', version: '>=56.14.100', required: false)
libavcodec = dependency('libavcodec', version: '>=58.18.100', required: false)
@ -57,8 +59,10 @@ if libavutil.found() and libavcodec.found() and libavformat.found()
)
endif
if libpng.found()
executable(
'screencopy',
'screencopy.c',
dependencies: [wayland_client, wlr_protos, wlroots]
dependencies: [wayland_client, wlr_protos, wlroots, libpng]
)
endif

101
examples/screencopy.c
View File

@ -26,6 +26,7 @@
#include <errno.h>
#include <fcntl.h>
#include <limits.h>
#include <png.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
@ -37,6 +38,11 @@
#include <wayland-client-protocol.h>
#include "wlr-screencopy-unstable-v1-client-protocol.h"
struct format {
enum wl_shm_format wl_format;
bool is_bgr;
};
static struct wl_shm *shm = NULL;
static struct zwlr_screencopy_manager_v1 *screencopy_manager = NULL;
static struct wl_output *output = NULL;
@ -50,16 +56,13 @@ static struct {
} buffer;
bool buffer_copy_done = false;
// wl_shm_format describes little-endian formats, ImageMagick uses big-endian
// formats.
static const struct {
enum wl_shm_format wl_format;
char *str_format;
} formats[] = {
{WL_SHM_FORMAT_XRGB8888, "BGRA"},
{WL_SHM_FORMAT_ARGB8888, "BGRA"},
{WL_SHM_FORMAT_XBGR8888, "RGBA"},
{WL_SHM_FORMAT_ABGR8888, "RGBA"},
// 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[] = {
{WL_SHM_FORMAT_XRGB8888, true},
{WL_SHM_FORMAT_ARGB8888, true},
{WL_SHM_FORMAT_XBGR8888, false},
{WL_SHM_FORMAT_ABGR8888, false},
};
static int backingfile(off_t size) {
@ -156,8 +159,8 @@ static void handle_global(void *data, struct wl_registry *registry,
output = wl_registry_bind(registry, name, &wl_output_interface, 1);
} else if (strcmp(interface, wl_shm_interface.name) == 0) {
shm = wl_registry_bind(registry, name, &wl_shm_interface, 1);
} else if (strcmp(interface, zwlr_screencopy_manager_v1_interface.name)
== 0) {
} else if (strcmp(interface,
zwlr_screencopy_manager_v1_interface.name) == 0) {
screencopy_manager = wl_registry_bind(registry, name,
&zwlr_screencopy_manager_v1_interface, 1);
}
@ -174,64 +177,56 @@ static const struct wl_registry_listener registry_listener = {
};
static void write_image(char *filename, enum wl_shm_format wl_fmt, int width,
int height, int stride, bool y_invert, void *data) {
char size[10 + 1 + 10 + 2 + 1]; // int32_t are max 10 digits
sprintf(size, "%dx%d+0", width, height);
const char *fmt_str = NULL;
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].wl_format == wl_fmt) {
fmt_str = formats[i].str_format;
fmt = &formats[i];
break;
}
}
if (fmt_str == NULL) {
if (fmt == NULL) {
fprintf(stderr, "unsupported format %"PRIu32"\n", wl_fmt);
exit(EXIT_FAILURE);
}
char convert[strlen(fmt_str) + 3];
memcpy(convert, fmt_str, strlen(fmt_str) + 1);
strcat(convert, ":-");
int fd[2];
if (pipe(fd) != 0) {
fprintf(stderr, "cannot create pipe: %s\n", strerror(errno));
FILE *f = fopen(filename, "wb");
if (f == NULL) {
fprintf(stderr, "failed to open output file\n");
exit(EXIT_FAILURE);
}
pid_t child = fork();
if (child < 0) {
fprintf(stderr, "fork() failed\n");
exit(EXIT_FAILURE);
} else if (child != 0) {
close(fd[0]);
if (write(fd[1], data, stride * height) < 0) {
fprintf(stderr, "write() failed: %s\n", strerror(errno));
exit(EXIT_FAILURE);
}
close(fd[1]);
waitpid(child, NULL, 0);
} else {
close(fd[1]);
if (dup2(fd[0], 0) != 0) {
fprintf(stderr, "cannot dup the pipe\n");
exit(EXIT_FAILURE);
}
close(fd[0]);
png_structp png =
png_create_write_struct(PNG_LIBPNG_VER_STRING, NULL, NULL, NULL);
png_infop info = png_create_info_struct(png);
char *argv[11] = {"convert", "-depth", "8", "-size", size, convert,
"-alpha", "opaque", filename, NULL};
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) {
argv[8] = "-flip";
argv[9] = filename;
argv[10] = NULL;
row = data + (height - i - 1) * stride;
} else {
row = data + i * stride;
}
png_write_row(png, row);
}
execvp("convert", argv);
png_write_end(png, NULL);
fprintf(stderr, "cannot execute convert\n");
exit(EXIT_FAILURE);
}
png_destroy_write_struct(&png, &info);
fclose(f);
}
int main(int argc, char *argv[]) {