/* wld: buffer.c
 *
 * Copyright (c) 2013, 2014 Michael Forney
 *
 * 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 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 "wld-private.h"

void buffer_initialize(struct buffer * buffer,
                       const struct wld_buffer_impl * impl,
                       uint32_t width, uint32_t height,
                       uint32_t format, uint32_t pitch)
{
    *((const struct wld_buffer_impl **) &buffer->base.impl) = impl;
    buffer->base.width = width;
    buffer->base.height = height;
    buffer->base.format = format;
    buffer->base.pitch = pitch;
    buffer->base.map = NULL;
    buffer->references = 1;
    buffer->map_references = 0;
    buffer->exporters = NULL;
    buffer->destructors = NULL;
    pixman_region32_init_rect(&buffer->base.damage, 0, 0, width, height);
}

EXPORT
bool wld_map(struct wld_buffer * base)
{
    struct buffer * buffer = (void *) base;

    if (buffer->map_references == 0 && !buffer->base.impl->map(buffer))
        return false;

    ++buffer->map_references;
    return true;
}

EXPORT
bool wld_unmap(struct wld_buffer * base)
{
    struct buffer * buffer = (void *) base;

    if (buffer->map_references == 0
        || (buffer->map_references == 1 && !buffer->base.impl->unmap(buffer)))
    {
        return false;
    }

    --buffer->map_references;
    return true;
}

EXPORT
bool wld_export(struct wld_buffer * base,
                uint32_t type, union wld_object * object)
{
    struct buffer * buffer = (void *) base;
    struct wld_exporter * exporter;

    for (exporter = buffer->exporters; exporter; exporter = exporter->next)
    {
        if (exporter->export(exporter, &buffer->base, type, object))
            return true;
    }

    return false;
}

EXPORT
void wld_buffer_add_exporter(struct wld_buffer * base,
                             struct wld_exporter * exporter)
{
    struct buffer * buffer = (void *) base;

    exporter->next = buffer->exporters;
    buffer->exporters = exporter;
}

EXPORT
void wld_buffer_add_destructor(struct wld_buffer * base,
                               struct wld_destructor * destructor)
{
    struct buffer * buffer = (void *) base;

    destructor->next = buffer->destructors;
    buffer->destructors = destructor;
}

EXPORT
void wld_buffer_reference(struct wld_buffer * base)
{
    struct buffer * buffer = (void *) base;

    ++buffer->references;
}

EXPORT
void wld_buffer_unreference(struct wld_buffer * base)
{
    struct buffer * buffer = (void *) base;
    struct wld_destructor * destructor, * next;

    if (--buffer->references > 0)
        return;

    pixman_region32_fini(&buffer->base.damage);

    for (destructor = buffer->destructors; destructor; destructor = next)
    {
        next = destructor->next;
        destructor->destroy(destructor);
    }

    if (buffer->map_references > 0)
        buffer->base.impl->unmap(buffer);

    buffer->base.impl->destroy(buffer);
}