cell-sdl3/camera.c

#include "cell.h"
#include <SDL3/SDL.h>
#include "sdl.h"

// Camera position enum to string
static const char *camera_position_to_string(SDL_CameraPosition pos) {
  switch (pos) {
    case SDL_CAMERA_POSITION_FRONT_FACING: return "front";
    case SDL_CAMERA_POSITION_BACK_FACING: return "back";
    default: return "unknown";
  }
} 

// SDL_Camera class
void SDL_Camera_free(JSRuntime *rt, SDL_Camera *camera) {
  if (camera) SDL_CloseCamera(camera);
}

QJSCLASS(SDL_Camera,)

// SDL_GetNumCameraDrivers() -> number
JSC_CCALL(camera_get_num_drivers,
  return JS_NewInt32(js, SDL_GetNumCameraDrivers());
)

// SDL_GetCameraDriver(index) -> string
JSC_CCALL(camera_get_driver,
  int index;
  JS_ToInt32(js, &index, argv[0]);
  const char *name = SDL_GetCameraDriver(index);
  return name ? JS_NewString(js, name) : JS_NULL;
)

// SDL_GetCurrentCameraDriver() -> string
JSC_CCALL(camera_get_current_driver,
  const char *name = SDL_GetCurrentCameraDriver();
  return name ? JS_NewString(js, name) : JS_NULL;
)

// SDL_GetCameras() -> array of camera IDs
JSC_CCALL(camera_get_cameras,
  int count = 0;
  SDL_CameraID *cameras = SDL_GetCameras(&count);
  if (!cameras) return JS_NewArray(js);
  
  JSValue arr = JS_NewArray(js);
  for (int i = 0; i < count; i++) {
    JS_SetPropertyUint32(js, arr, i, JS_NewUint32(js, cameras[i]));
  }
  SDL_free(cameras);
  return arr;
)

// SDL_GetCameraSupportedFormats(id) -> array of format objects
JSC_CCALL(camera_get_supported_formats,
  uint32_t id;
  JS_ToUint32(js, &id, argv[0]);
  
  int count = 0;
  SDL_CameraSpec **specs = SDL_GetCameraSupportedFormats(id, &count);
  if (!specs) return JS_NewArray(js);
  
  JSValue arr = JS_NewArray(js);
  for (int i = 0; i < count; i++) {
    SDL_CameraSpec *spec = specs[i];
    JSValue obj = JS_NewObject(js);
    JS_SetPropertyStr(js, obj, "format", SDL_PixelFormat2js(js, spec->format));
    JS_SetPropertyStr(js, obj, "width", JS_NewInt32(js, spec->width));
    JS_SetPropertyStr(js, obj, "height", JS_NewInt32(js, spec->height));
    JS_SetPropertyStr(js, obj, "framerate_numerator", JS_NewInt32(js, spec->framerate_numerator));
    JS_SetPropertyStr(js, obj, "framerate_denominator", JS_NewInt32(js, spec->framerate_denominator));
    JS_SetPropertyUint32(js, arr, i, obj);
  }
  SDL_free(specs);
  return arr;
)

// SDL_GetCameraName(id) -> string
JSC_CCALL(camera_get_name,
  uint32_t id;
  JS_ToUint32(js, &id, argv[0]);
  const char *name = SDL_GetCameraName(id);
  return name ? JS_NewString(js, name) : JS_NULL;
)

// SDL_GetCameraPosition(id) -> string
JSC_CCALL(camera_get_position,
  uint32_t id;
  JS_ToUint32(js, &id, argv[0]);
  SDL_CameraPosition pos = SDL_GetCameraPosition(id);
  return JS_NewString(js, camera_position_to_string(pos));
)

// SDL_OpenCamera(id, spec) -> Camera object
JSC_CCALL(camera_open,
  uint32_t id;
  JS_ToUint32(js, &id, argv[0]);
  
  SDL_CameraSpec spec_val, *spec = NULL;
  if (argc > 1 && !JS_IsNull(argv[1])) {
    JSValue format_val = JS_GetPropertyStr(js, argv[1], "format");
    spec_val.format = js2SDL_PixelFormat(js, format_val);
    JS_FreeValue(js, format_val);
    
    JS_GETATOM(js, spec_val.width, argv[1], width, number);
    JS_GETATOM(js, spec_val.height, argv[1], height, number);
    JS_GETATOM(js, spec_val.framerate_numerator, argv[1], framerate_numerator, number);
    JS_GETATOM(js, spec_val.framerate_denominator, argv[1], framerate_denominator, number);
    spec = &spec_val;
  }
  
  SDL_Camera *camera = SDL_OpenCamera(id, spec);
  if (!camera) return JS_NULL;
  return SDL_Camera2js(js, camera);
)

// Camera instance methods
JSC_CCALL(camera_get_permission_state,
  SDL_Camera *camera = js2SDL_Camera(js, self);
  return JS_NewInt32(js, SDL_GetCameraPermissionState(camera));
)

JSC_CCALL(camera_get_id,
  SDL_Camera *camera = js2SDL_Camera(js, self);
  return JS_NewUint32(js, SDL_GetCameraID(camera));
)

JSC_CCALL(camera_get_format,
  SDL_Camera *camera = js2SDL_Camera(js, self);
  SDL_CameraSpec spec;
  if (!SDL_GetCameraFormat(camera, &spec)) return JS_NULL;
  
  JSValue obj = JS_NewObject(js);
  JS_SetPropertyStr(js, obj, "format", SDL_PixelFormat2js(js, spec.format));
  JS_SetPropertyStr(js, obj, "width", JS_NewInt32(js, spec.width));
  JS_SetPropertyStr(js, obj, "height", JS_NewInt32(js, spec.height));
  JS_SetPropertyStr(js, obj, "framerate_numerator", JS_NewInt32(js, spec.framerate_numerator));
  JS_SetPropertyStr(js, obj, "framerate_denominator", JS_NewInt32(js, spec.framerate_denominator));
  return obj;
)

JSC_CCALL(camera_acquire_frame,
  SDL_Camera *camera = js2SDL_Camera(js, self);
  Uint64 timestamp;
  SDL_Surface *surface = SDL_AcquireCameraFrame(camera, &timestamp);
  if (!surface) return JS_NULL;
  
  JSValue obj = JS_NewObject(js);
  JS_SetPropertyStr(js, obj, "surface", SDL_Surface2js(js, surface));
  JS_SetPropertyStr(js, obj, "timestamp", JS_NewInt64(js, timestamp));
  return obj;
)

JSC_CCALL(camera_release_frame,
  SDL_Camera *camera = js2SDL_Camera(js, self);
  SDL_Surface *surface = js2SDL_Surface(js, argv[0]);
  SDL_ReleaseCameraFrame(camera, surface);
  return JS_NULL;
)

JSC_CCALL(camera_close,
  SDL_Camera *camera = js2SDL_Camera(js, self);
  SDL_CloseCamera(camera);
  return JS_NULL;
)

static const JSCFunctionListEntry js_SDL_Camera_funcs[] = {
  MIST_FUNC_DEF(camera, get_permission_state, 0),
  MIST_FUNC_DEF(camera, get_id, 0),
  MIST_FUNC_DEF(camera, get_format, 0),
  MIST_FUNC_DEF(camera, acquire_frame, 0),
  MIST_FUNC_DEF(camera, release_frame, 1),
  MIST_FUNC_DEF(camera, close, 0),
};

static const JSCFunctionListEntry js_camera_funcs[] = {
  MIST_FUNC_DEF(camera, get_num_drivers, 0),
  MIST_FUNC_DEF(camera, get_driver, 1),
  MIST_FUNC_DEF(camera, get_current_driver, 0),
  MIST_FUNC_DEF(camera, get_cameras, 0),
  MIST_FUNC_DEF(camera, get_supported_formats, 1),
  MIST_FUNC_DEF(camera, get_name, 1),
  MIST_FUNC_DEF(camera, get_position, 1),
  MIST_FUNC_DEF(camera, open, 2),
};

CELL_USE_INIT(
  SDL_Init(SDL_INIT_CAMERA);
  QJSCLASSPREP_FUNCS(SDL_Camera);
  
  JSValue ret = JS_NewObject(js);
  JS_SetPropertyFunctionList(js, ret, js_camera_funcs, countof(js_camera_funcs));
  
  return ret;
)