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/*
* Copyright © 2015 Collabora, Ltd.
*
* 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.
*/
#include "config.h"
#include <stdlib.h>
#include <assert.h>
#include <ctype.h>
#include <string.h>
#include <errno.h>
#include <linux/input.h>
#include "compositor.h"
#include "file-util.h"
static char *
encode_PAM_comment_line(const char *comment)
{
size_t len = strlen(comment);
char *str = malloc(len + 2);
char *dst = str;
const char *src = comment;
const char *end = src + len;
*dst++ = '#';
*dst++ = ' ';
for (; src < end; src++, dst++) {
if (*src == '\n' || !isprint(*src))
*dst = '_';
else
*dst = *src;
}
return str;
}
/*
* PAM image format:
* http://en.wikipedia.org/wiki/Netpbm#PAM_graphics_format
* RGBA is in byte address order.
*
* ImageMagick 'convert' can convert a PAM image to a more common format.
* To view the image metadata: $ head -n7 image.pam
*/
static int
write_PAM_image_rgba(FILE *fp, int width, int height,
void *pixels, size_t size, const char *comment)
{
char *str;
int ret;
assert(size == (size_t)4 * width * height);
ret = fprintf(fp, "P7\nWIDTH %d\nHEIGHT %d\nDEPTH 4\nMAXVAL 255\n"
"TUPLTYPE RGB_ALPHA\n", width, height);
if (ret < 0)
return -1;
if (comment) {
str = encode_PAM_comment_line(comment);
ret = fprintf(fp, "%s\n", str);
free(str);
if (ret < 0)
return -1;
}
ret = fprintf(fp, "ENDHDR\n");
if (ret < 0)
return -1;
if (fwrite(pixels, 1, size, fp) != size)
return -1;
if (ferror(fp))
return -1;
return 0;
}
static uint32_t
unmult(uint32_t c, uint32_t a)
{
return (c * 255 + a / 2) / a;
}
static void
unpremultiply_and_swap_a8b8g8r8_to_PAMrgba(void *pixels, size_t size)
{
uint32_t *p = pixels;
uint32_t *end;
for (end = p + size / 4; p < end; p++) {
uint32_t v = *p;
uint32_t a;
a = (v & 0xff000000) >> 24;
if (a == 0) {
*p = 0;
} else {
uint8_t *dst = (uint8_t *)p;
dst[0] = unmult((v & 0x000000ff) >> 0, a);
dst[1] = unmult((v & 0x0000ff00) >> 8, a);
dst[2] = unmult((v & 0x00ff0000) >> 16, a);
dst[3] = a;
}
}
}
static void
trigger_binding(struct weston_keyboard *keyboard, uint32_t time, uint32_t key,
void *data)
{
const char *prefix = "surfaceshot-";
const char *suffix = ".pam";
char fname[1024];
struct weston_surface *surface;
struct weston_seat *seat = keyboard->seat;
int width, height;
char desc[512];
void *pixels;
const size_t bytespp = 4; /* PIXMAN_a8b8g8r8 */
size_t sz;
int ret;
FILE *fp;
if (seat->pointer_device_count == 0 ||
!seat->pointer ||
!seat->pointer->focus)
return;
surface = seat->pointer->focus->surface;
weston_surface_get_content_size(surface, &width, &height);
if (!surface->get_label ||
surface->get_label(surface, desc, sizeof(desc)) < 0)
snprintf(desc, sizeof(desc), "(unknown)");
weston_log("surface screenshot of %p: '%s', %dx%d\n",
surface, desc, width, height);
sz = width * bytespp * height;
if (sz == 0) {
weston_log("no content for %p\n", surface);
return;
}
pixels = malloc(sz);
if (!pixels) {
weston_log("%s: failed to malloc %zu B\n", __func__, sz);
return;
}
ret = weston_surface_copy_content(surface, pixels, sz,
0, 0, width, height);
if (ret < 0) {
weston_log("shooting surface %p failed\n", surface);
goto out;
}
unpremultiply_and_swap_a8b8g8r8_to_PAMrgba(pixels, sz);
fp = file_create_dated(prefix, suffix, fname, sizeof(fname));
if (!fp) {
const char *msg;
switch (errno) {
case ETIME:
msg = "failure in datetime formatting";
break;
default:
msg = strerror(errno);
}
weston_log("Cannot open '%s*%s' for writing: %s\n",
prefix, suffix, msg);
goto out;
}
ret = write_PAM_image_rgba(fp, width, height, pixels, sz, desc);
if (fclose(fp) != 0 || ret < 0)
weston_log("writing surface %p screenshot failed.\n", surface);
else
weston_log("successfully shot surface %p into '%s'\n",
surface, fname);
out:
free(pixels);
}
WL_EXPORT int
module_init(struct weston_compositor *ec,
int *argc, char *argv[])
{
weston_compositor_add_debug_binding(ec, KEY_H, trigger_binding, ec);
return 0;
}
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