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weston/libweston/color.c

351 lines
8.9 KiB

/*
* Copyright 2019 Sebastian Wick
* Copyright 2021 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 <libweston/libweston.h>
#include <assert.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <sys/mman.h>
#include <errno.h>
#include <string.h>
#include "color.h"
#include "libweston-internal.h"
/**
* Increase reference count of the color profile object
*
* \param cprof The color profile. NULL is accepted too.
* \return cprof.
*/
WL_EXPORT struct weston_color_profile *
weston_color_profile_ref(struct weston_color_profile *cprof)
{
/* NULL is a valid color space: sRGB */
if (!cprof)
return NULL;
assert(cprof->ref_count > 0);
cprof->ref_count++;
return cprof;
}
/**
* Decrease reference count and potentially destroy the color profile object
*
* \param cprof The color profile. NULL is accepted too.
*/
WL_EXPORT void
weston_color_profile_unref(struct weston_color_profile *cprof)
{
if (!cprof)
return;
assert(cprof->ref_count > 0);
if (--cprof->ref_count > 0)
return;
cprof->cm->destroy_color_profile(cprof);
}
/**
* Get color profile description
*
* A description of the profile is meant for human readable logs.
*
* \param cprof The color profile, NULL is accepted too.
* \returns The color profile description, valid as long as the
* color profile itself is.
*/
WL_EXPORT const char *
weston_color_profile_get_description(struct weston_color_profile *cprof)
{
if (cprof)
return cprof->description;
else
return "built-in default sRGB SDR profile";
}
/**
* Initializes a newly allocated color profile object
*
* This is used only by color managers. They sub-class weston_color_profile.
*
* The reference count starts at 1.
*
* To destroy a weston_color_profile, use weston_color_profile_unref().
*/
WL_EXPORT void
weston_color_profile_init(struct weston_color_profile *cprof,
struct weston_color_manager *cm)
{
cprof->cm = cm;
cprof->ref_count = 1;
}
/**
* Increase reference count of the color transform object
*
* \param xform The color transform. NULL is accepted too.
* \return xform.
*/
WL_EXPORT struct weston_color_transform *
weston_color_transform_ref(struct weston_color_transform *xform)
{
/* NULL is a valid color transform: identity */
if (!xform)
return NULL;
assert(xform->ref_count > 0);
xform->ref_count++;
return xform;
}
/**
* Decrease and potentially destroy the color transform object
*
* \param xform The color transform. NULL is accepted too.
*/
WL_EXPORT void
weston_color_transform_unref(struct weston_color_transform *xform)
{
if (!xform)
return;
assert(xform->ref_count > 0);
if (--xform->ref_count > 0)
return;
wl_signal_emit(&xform->destroy_signal, xform);
xform->cm->destroy_color_transform(xform);
}
/**
* Initializes a newly allocated color transform object
*
* This is used only by color managers. They sub-class weston_color_transform.
*
* The reference count starts at 1.
*
* To destroy a weston_color_transform, use weston_color_transfor_unref().
*/
WL_EXPORT void
weston_color_transform_init(struct weston_color_transform *xform,
struct weston_color_manager *cm)
{
xform->cm = cm;
xform->ref_count = 1;
wl_signal_init(&xform->destroy_signal);
}
/** Deep copy */
void
weston_surface_color_transform_copy(struct weston_surface_color_transform *dst,
const struct weston_surface_color_transform *src)
{
*dst = *src;
dst->transform = weston_color_transform_ref(src->transform);
}
/** Unref contents */
void
weston_surface_color_transform_fini(struct weston_surface_color_transform *surf_xform)
{
weston_color_transform_unref(surf_xform->transform);
surf_xform->transform = NULL;
surf_xform->identity_pipeline = false;
}
/**
* Ensure that the surface's color transformation for the given output is
* populated in the paint nodes for all the views.
*
* Creates the color transformation description if necessary by calling
* into the color manager.
*
* \param pnode Paint node defining the surface and the output. All
* paint nodes with the same surface and output will be ensured.
*/
void
weston_paint_node_ensure_color_transform(struct weston_paint_node *pnode)
{
struct weston_surface *surface = pnode->surface;
struct weston_output *output = pnode->output;
struct weston_color_manager *cm = surface->compositor->color_manager;
struct weston_surface_color_transform surf_xform = {};
struct weston_paint_node *it;
bool ok;
/*
* Invariant: all paint nodes with the same surface+output have the
* same surf_xform state.
*/
if (pnode->surf_xform_valid)
return;
ok = cm->get_surface_color_transform(cm, surface, output, &surf_xform);
wl_list_for_each(it, &surface->paint_node_list, surface_link) {
if (it->output == output) {
assert(it->surf_xform_valid == false);
assert(it->surf_xform.transform == NULL);
weston_surface_color_transform_copy(&it->surf_xform,
&surf_xform);
it->surf_xform_valid = ok;
}
}
weston_surface_color_transform_fini(&surf_xform);
if (!ok) {
if (surface->resource)
wl_resource_post_no_memory(surface->resource);
weston_log("Failed to create color transformation for a surface.\n");
}
}
/**
* Load ICC profile file
*
* Loads an ICC profile file, ensures it is fit for use, and returns a
* new reference to the weston_color_profile. Use weston_color_profile_unref()
* to free it.
*
* \param compositor The compositor instance, identifies the color manager.
* \param path Path to the ICC file to be open()'d.
* \return A color profile reference, or NULL on failure.
*
* Error messages are printed to libweston log.
*
* This function is not meant for loading profiles on behalf of Wayland
* clients.
*/
WL_EXPORT struct weston_color_profile *
weston_compositor_load_icc_file(struct weston_compositor *compositor,
const char *path)
{
struct weston_color_manager *cm = compositor->color_manager;
struct weston_color_profile *cprof = NULL;
int fd;
struct stat icc_stat;
void *icc_data;
size_t len;
char *errmsg = NULL;
fd = open(path, O_RDONLY);
if (fd == -1) {
weston_log("Error: Cannot open ICC profile \"%s\" for reading: %s\n",
path, strerror(errno));
return NULL;
}
if (fstat(fd, &icc_stat) != 0) {
weston_log("Error: Cannot fstat ICC profile \"%s\": %s\n",
path, strerror(errno));
goto out_close;
}
len = icc_stat.st_size;
if (len < 1) {
weston_log("Error: ICC profile \"%s\" has no size.\n", path);
goto out_close;
}
icc_data = mmap(NULL, len, PROT_READ, MAP_PRIVATE, fd, 0);
if (icc_data == MAP_FAILED) {
weston_log("Error: Cannot mmap ICC profile \"%s\": %s\n",
path, strerror(errno));
goto out_close;
}
if (!cm->get_color_profile_from_icc(cm, icc_data, len,
path, &cprof, &errmsg)) {
weston_log("Error: loading ICC profile \"%s\" failed: %s\n",
path, errmsg);
free(errmsg);
}
munmap(icc_data, len);
out_close:
close(fd);
return cprof;
}
/** Get a string naming the EOTF mode
*
* \internal
*/
WL_EXPORT const char *
weston_eotf_mode_to_str(enum weston_eotf_mode e)
{
switch (e) {
case WESTON_EOTF_MODE_NONE: return "(none)";
case WESTON_EOTF_MODE_SDR: return "SDR";
case WESTON_EOTF_MODE_TRADITIONAL_HDR: return "traditional gamma HDR";
case WESTON_EOTF_MODE_ST2084: return "ST2084";
case WESTON_EOTF_MODE_HLG: return "HLG";
}
return "???";
}
/** A list of EOTF modes as a string
*
* \param eotf_mask Bitwise-or'd enum weston_eotf_mode values.
* \return Comma separated names of the listed EOTF modes. Must be free()'d by
* the caller.
*/
WL_EXPORT char *
weston_eotf_mask_to_str(uint32_t eotf_mask)
{
FILE *fp;
char *str = NULL;
size_t size = 0;
unsigned i;
const char *sep = "";
fp = open_memstream(&str, &size);
if (!fp)
return NULL;
for (i = 0; eotf_mask; i++) {
uint32_t bitmask = 1u << i;
if (eotf_mask & bitmask) {
fprintf(fp, "%s%s", sep,
weston_eotf_mode_to_str(bitmask));
sep = ", ";
}
eotf_mask &= ~bitmask;
}
fclose(fp);
return str;
}