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#include <assert.h>
#include <drm_fourcc.h>
#include <stdbool.h>
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
#include <wlr/render/drm_format_set.h>
#include <wlr/util/log.h>
#include "render/drm_format_set.h"
void wlr_drm_format_set_finish(struct wlr_drm_format_set *set) {
for (size_t i = 0; i < set->len; ++i) {
free(set->formats[i]);
}
free(set->formats);
set->len = 0;
set->cap = 0;
set->formats = NULL;
}
static struct wlr_drm_format **format_set_get_ref(struct wlr_drm_format_set *set,
uint32_t format) {
for (size_t i = 0; i < set->len; ++i) {
if (set->formats[i]->format == format) {
return &set->formats[i];
}
}
return NULL;
}
const struct wlr_drm_format *wlr_drm_format_set_get(
const struct wlr_drm_format_set *set, uint32_t format) {
struct wlr_drm_format **ptr =
format_set_get_ref((struct wlr_drm_format_set *)set, format);
return ptr ? *ptr : NULL;
}
bool wlr_drm_format_set_has(const struct wlr_drm_format_set *set,
uint32_t format, uint64_t modifier) {
const struct wlr_drm_format *fmt = wlr_drm_format_set_get(set, format);
if (!fmt) {
return false;
}
if (modifier == DRM_FORMAT_MOD_INVALID) {
return true;
}
for (size_t i = 0; i < fmt->len; ++i) {
if (fmt->modifiers[i] == modifier) {
return true;
}
}
return false;
}
bool wlr_drm_format_set_add(struct wlr_drm_format_set *set, uint32_t format,
uint64_t modifier) {
assert(format != DRM_FORMAT_INVALID);
struct wlr_drm_format **ptr = format_set_get_ref(set, format);
if (ptr) {
return wlr_drm_format_add(ptr, modifier);
}
struct wlr_drm_format *fmt = wlr_drm_format_create(format);
if (!fmt) {
return false;
}
if (!wlr_drm_format_add(&fmt, modifier)) {
return false;
}
if (set->len == set->cap) {
size_t new = set->cap ? set->cap * 2 : 4;
struct wlr_drm_format **tmp = realloc(set->formats,
sizeof(*fmt) + sizeof(fmt->modifiers[0]) * new);
if (!tmp) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
free(fmt);
return false;
}
set->cap = new;
set->formats = tmp;
}
set->formats[set->len++] = fmt;
return true;
}
struct wlr_drm_format *wlr_drm_format_create(uint32_t format) {
size_t cap = 4;
struct wlr_drm_format *fmt =
calloc(1, sizeof(*fmt) + sizeof(fmt->modifiers[0]) * cap);
if (!fmt) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
fmt->format = format;
fmt->cap = cap;
return fmt;
}
bool wlr_drm_format_add(struct wlr_drm_format **fmt_ptr, uint64_t modifier) {
struct wlr_drm_format *fmt = *fmt_ptr;
if (modifier == DRM_FORMAT_MOD_INVALID) {
return true;
}
for (size_t i = 0; i < fmt->len; ++i) {
if (fmt->modifiers[i] == modifier) {
return true;
}
}
if (fmt->len == fmt->cap) {
size_t cap = fmt->cap ? fmt->cap * 2 : 4;
fmt = realloc(fmt, sizeof(*fmt) + sizeof(fmt->modifiers[0]) * cap);
if (!fmt) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return false;
}
fmt->cap = cap;
*fmt_ptr = fmt;
}
fmt->modifiers[fmt->len++] = modifier;
return true;
}
struct wlr_drm_format *wlr_drm_format_dup(const struct wlr_drm_format *format) {
assert(format->len <= format->cap);
size_t format_size = sizeof(struct wlr_drm_format) +
format->cap * sizeof(format->modifiers[0]);
struct wlr_drm_format *duped_format = malloc(format_size);
if (duped_format == NULL) {
return NULL;
}
memcpy(duped_format, format, format_size);
return duped_format;
}
struct wlr_drm_format *wlr_drm_format_intersect(
const struct wlr_drm_format *a, const struct wlr_drm_format *b) {
assert(a->format == b->format);
// Special case: if a format only supports LINEAR and the other doesn't
// support any modifier, force LINEAR. This will force the allocator to
// create a buffer with a LINEAR layout instead of an implicit modifier.
if (a->len == 0 && b->len == 1 && b->modifiers[0] == DRM_FORMAT_MOD_LINEAR) {
return wlr_drm_format_dup(b);
}
if (b->len == 0 && a->len == 1 && a->modifiers[0] == DRM_FORMAT_MOD_LINEAR) {
return wlr_drm_format_dup(a);
}
size_t format_cap = a->len < b->len ? a->len : b->len;
size_t format_size = sizeof(struct wlr_drm_format) +
format_cap * sizeof(a->modifiers[0]);
struct wlr_drm_format *format = calloc(1, format_size);
if (format == NULL) {
wlr_log_errno(WLR_ERROR, "Allocation failed");
return NULL;
}
format->format = a->format;
format->cap = format_cap;
for (size_t i = 0; i < a->len; i++) {
for (size_t j = 0; j < b->len; j++) {
if (a->modifiers[i] == b->modifiers[j]) {
assert(format->len < format->cap);
format->modifiers[format->len] = a->modifiers[i];
format->len++;
break;
}
}
}
// If both formats support modifiers, but the intersection is empty, then
// the formats aren't compatible with each other
if (format->len == 0 && a->len > 0 && b->len > 0) {
free(format);
return NULL;
}
return format;
}
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