// Copyright 2016 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.

module media.mojom;

// Equivalent to idl MediaSettingsRange, arbitrary range representing the
// allowed variations of a Capability or an Option.
// https://w3c.github.io/mediacapture-image/#mediasettingsrange-section
struct Range {
  double max;
  double min;
  double current;
  double step;
};

// https://w3c.github.io/mediacapture-image/#meteringmode-section
enum MeteringMode { NONE, MANUAL, SINGLE_SHOT, CONTINUOUS };

// https://w3c.github.io/mediacapture-image/#redeyereduction-section
enum RedEyeReduction { NEVER, ALWAYS, CONTROLLABLE };

//  https://www.w3.org/TR/image-capture/#FillLightMode
enum FillLightMode { OFF, AUTO, FLASH };

// Equivalent to idl's MediaTrackCapabilities plus PhotoCapabilities and their
// associated settings.
struct PhotoState {
  // https://w3c.github.io/mediacapture-image/#mediatrackcapabilities-section
  // and https://w3c.github.io/mediacapture-image/#mediatracksettings-section
  array<MeteringMode> supported_white_balance_modes;
  MeteringMode current_white_balance_mode;
  array<MeteringMode> supported_exposure_modes;
  MeteringMode current_exposure_mode;
  array<MeteringMode> supported_focus_modes;
  MeteringMode current_focus_mode;
  array<Point2D> points_of_interest;

  Range exposure_compensation;
  Range color_temperature;
  Range iso;

  Range brightness;
  Range contrast;
  Range saturation;
  Range sharpness;

  Range zoom;

  bool supports_torch;
  bool torch;

  // https://w3c.github.io/mediacapture-image/##photocapabilities-section and
  // https://w3c.github.io/mediacapture-image/##photosettings-section
  RedEyeReduction red_eye_reduction;
  Range height;
  Range width;
  array<FillLightMode> fill_light_mode;
};

// Equivalent to idl Point2D.
// https://w3c.github.io/mediacapture-image/#point2d-section
// TODO(mcasas): use gfx::mojom::PointF after https://crbug.com/640049.
struct Point2D {
  float x;
  float y;
};

// Equivalent to idl PhotoSettings + MediaTrackSettings/MediaTrackConstraintSet.
// PODs cannot be nullable, i.e. uint32? bla doesn't work, use |has_bla| flags.
struct PhotoSettings {
  // https://w3c.github.io/mediacapture-image/#mediatracksettings-section and
  // https://w3c.github.io/mediacapture-image/#mediatrackconstraintset-section
  bool has_white_balance_mode;
  MeteringMode white_balance_mode;
  bool has_exposure_mode;
  MeteringMode exposure_mode;
  bool has_focus_mode;
  MeteringMode focus_mode;
  array<Point2D> points_of_interest;

  bool has_exposure_compensation;
  double exposure_compensation;
  bool has_color_temperature;
  double color_temperature;
  bool has_iso;
  double iso;

  bool has_brightness;
  double brightness;
  bool has_contrast;
  double contrast;
  bool has_saturation;
  double saturation;
  bool has_sharpness;
  double sharpness;

  bool has_zoom;
  double zoom;

  bool has_torch;
  bool torch;

  // https://w3c.github.io/mediacapture-image/##photosettings-section
  bool has_fill_light_mode;
  FillLightMode fill_light_mode;
  bool has_width;
  double width;
  bool has_height;
  double height;
  bool has_red_eye_reduction;
  bool red_eye_reduction;
};

// This is a mojo move-only equivalent of a Blob, i.e. MIME type and Data.
struct Blob {
  string mime_type;
  array<uint8> data;
};

// |source_id| is the renderer-side UUID identifier of the image capture device.
interface ImageCapture
{
    // Retrieves the image capture device capabilities and current settings.
    // https://www.w3.org/TR/image-capture/#dom-imagecapture-getphotocapabilities
    GetPhotoState(string source_id)
        => (PhotoState state);

    // Sets the |settings| on the associated video capture device.
    // https://www.w3.org/TR/image-capture/#dom-imagecapture-setoptions
    SetOptions(string source_id, PhotoSettings settings)
        => (bool success);

    // Takes a Photo from the given |source_id|, returning it encoded in |blob|
    // with the format specified in its |mime_type|.
    // https://www.w3.org/TR/image-capture/#dom-imagecapture-takephoto
    TakePhoto(string source_id)
        => (Blob blob);
};