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/* SPDX-License-Identifier: GPL-2.0-or-later
* Copyright 2021 Blender Foundation. */
/** \file
* \ingroup draw_engine
*/
#pragma once
#include "BKE_image.h"
#include "BKE_image_partial_update.hh"
struct PartialImageUpdater {
struct PartialUpdateUser *user;
const struct Image *image;
/**
* \brief Ensure that there is a partial update user for the given image.
*/
void ensure_image(const Image *new_image)
{
if (!is_valid(new_image)) {
free();
create(new_image);
}
}
virtual ~PartialImageUpdater()
{
free();
}
private:
/**
* \brief check if the partial update user can still be used for the given image.
*
* When switching to a different image the partial update user should be recreated.
*/
bool is_valid(const Image *new_image) const
{
if (image != new_image) {
return false;
}
return user != nullptr;
}
void create(const Image *new_image)
{
BLI_assert(user == nullptr);
user = BKE_image_partial_update_create(new_image);
image = new_image;
}
void free()
{
if (user != nullptr) {
BKE_image_partial_update_free(user);
user = nullptr;
image = nullptr;
}
}
};
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