1

#ifndef RENDER_MULTI_H

     2

#define RENDER_MULTI_H

     3

     4

#include <event2/util.h>

     5

#include <event2/buffer.h>

     6

     7

#include "render.h"

     8

#include "remote_pool.h"

     9

    10

/*

    11

 * Execute a given render_t operate across multiple remote render nodes, and aggregate the results into a single PNG stream locally

    12

 */

    13

    14

struct render_multi;

    15

    16

// how many nodes can be involved in a render operation at most

    17

#define RENDER_MULTI_NODES_MAX 2

    18

    19

/*

    20

 * Execute the given render operation on multiple nodes from the given remote pool, streaming back the result in PNG format via the given callbacks

    21

 *

    22

 * The behaviour of the callbacks is mostly the same as for render_remote.h

    23

 */

    24

struct render_multi *render_multi (

    25

        struct render *render_ctx,               // what to render

    26

        struct remote_pool *pool_info,    // what render pool to use

    27

        void (*cb_sent)(void *arg),

    28

        void (*cb_data)(struct evbuffer *buf, void *arg),

    29

        void (*cb_done)(void *arg),

    30

        void (*cb_fail)(void *arg),

    31

        void *cb_arg

    32

);

    33

    34

void render_multi_cancel (struct render_multi *ctx);

    35

    36

void render_multi_set_recv (struct render_multi *ctx, size_t recv_threshold, size_t unread_buffer);

    37

    38

int render_multi_flush (struct render_multi *ctx);

    39

    40

void render_multi_free (struct render_multi *ctx);

    41

    42

#endif /* RENDER_MULTI_H */