diff options
Diffstat (limited to 'examples/screencopy.c')
| -rw-r--r-- | examples/screencopy.c | 56 |
1 files changed, 41 insertions, 15 deletions
diff --git a/examples/screencopy.c b/examples/screencopy.c index 7be06d68..dc1984e6 100644 --- a/examples/screencopy.c +++ b/examples/screencopy.c @@ -44,11 +44,24 @@ static struct wl_output *output = NULL; static struct { struct wl_buffer *wl_buffer; void *data; + enum wl_shm_format format; int width, height, stride; bool y_invert; } 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"}, +}; + static int backingfile(off_t size) { char template[] = "/tmp/wlroots-shared-XXXXXX"; int fd = mkstemp(template); @@ -69,9 +82,8 @@ static int backingfile(off_t size) { return fd; } -static struct wl_buffer *create_shm_buffer(int width, int height, - int *stride_out, void **data_out) { - int stride = width * 4; +static struct wl_buffer *create_shm_buffer(enum wl_shm_format fmt, + int width, int height, int stride, void **data_out) { int size = stride * height; int fd = backingfile(size); @@ -90,21 +102,22 @@ static struct wl_buffer *create_shm_buffer(int width, int height, struct wl_shm_pool *pool = wl_shm_create_pool(shm, fd, size); close(fd); struct wl_buffer *buffer = wl_shm_pool_create_buffer(pool, 0, width, height, - stride, WL_SHM_FORMAT_XRGB8888); + stride, fmt); wl_shm_pool_destroy(pool); *data_out = data; - *stride_out = stride; return buffer; } static void frame_handle_buffer(void *data, - struct zwlr_screencopy_frame_v1 *frame, uint32_t width, uint32_t height, - uint32_t format, uint32_t stride) { + struct zwlr_screencopy_frame_v1 *frame, uint32_t format, + uint32_t width, uint32_t height, uint32_t stride) { + buffer.format = format; buffer.width = width; buffer.height = height; + buffer.stride = stride; buffer.wl_buffer = - create_shm_buffer(width, height, &buffer.stride, &buffer.data); + create_shm_buffer(format, width, height, stride, &buffer.data); if (buffer.wl_buffer == NULL) { fprintf(stderr, "failed to create buffer\n"); exit(EXIT_FAILURE); @@ -160,11 +173,26 @@ static const struct wl_registry_listener registry_listener = { .global_remove = handle_global_remove, }; -static void write_image(char *filename, int width, int height, int stride, - bool y_invert, void *data) { +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; + 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; + break; + } + } + if (fmt_str == 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)); @@ -191,9 +219,7 @@ static void write_image(char *filename, int width, int height, int stride, } close(fd[0]); - // We requested WL_SHM_FORMAT_XRGB8888 in little endian, so that's BGRA - // in big endian. - char *argv[11] = {"convert", "-depth", "8", "-size", size, "bgra:-", + char *argv[11] = {"convert", "-depth", "8", "-size", size, convert, "-alpha", "opaque", filename, NULL}; if (y_invert) { argv[8] = "-flip"; @@ -241,8 +267,8 @@ int main(int argc, char *argv[]) { // This space is intentionally left blank } - write_image("wayland-screenshot.png", buffer.width, buffer.height, - buffer.stride, buffer.y_invert, buffer.data); + write_image("wayland-screenshot.png", buffer.format, buffer.width, + buffer.height, buffer.stride, buffer.y_invert, buffer.data); wl_buffer_destroy(buffer.wl_buffer); return EXIT_SUCCESS; |