board_view_provider.c

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#include <stdint.h>
#include <unistd.h>
 
#include "board_view.h"
#include "board_view_provider_internal.h"
 
#ifdef __APPLE__

RA8_INTERNAL static int internal_provider_fd(void* info)
{
  return (int)((intptr_t)info - 1);
}

RA8_INTERNAL static size_t
internal_provider_read(void* info, void* buffer, off_t position, size_t count)
{
  return board_view_read_rgb888_fd(internal_provider_fd(info), position, buffer, count);
}

RA8_INTERNAL static void internal_provider_release(void* info)
{
  (void)close(internal_provider_fd(info));
}
 
CGDataProviderRef priv_board_view_provider_create(int snapshot_fd, size_t provider_bytes)
{
  if ((snapshot_fd < 0) || (provider_bytes == 0U)) {
    if (snapshot_fd >= 0) {
      (void)close(snapshot_fd);
    }
    return nullptr;
  }
  const CGDataProviderDirectCallbacks callbacks = {
    .version            = 0U,
    .getBytePointer     = nullptr,
    .releaseBytePointer = nullptr,
    .getBytesAtPosition = internal_provider_read,
    .releaseInfo        = internal_provider_release,
  };
  CGDataProviderRef provider =
    CGDataProviderCreateDirect((void*)(intptr_t)(snapshot_fd + 1), provider_bytes, &callbacks);
  if (provider == nullptr) {
    (void)close(snapshot_fd);
  }
  return provider;
}
#else
CGDataProviderRef priv_board_view_provider_create(int snapshot_fd, size_t provider_bytes)
{
  (void)provider_bytes;
  if (snapshot_fd >= 0) {
    (void)close(snapshot_fd);
  }
  return nullptr;
}
#endif