DXR is a code search and navigation tool aimed at making sense of large projects. It supports full-text and regex searches as well as structural queries.

Implementation

Mercurial (d1ed7de67f5a)

VCS Links

Line Code
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236
/*
 * Copyright (C) 2013-2014 Mozilla Foundation
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#ifndef DOM_CAMERA_GONKCAMERAPARAMETERS_H
#define DOM_CAMERA_GONKCAMERAPARAMETERS_H

#include <math.h>
#include "camera/CameraParameters.h"
#include "nsTArray.h"
#include "nsString.h"
#include "AutoRwLock.h"
#include "nsPrintfCString.h"
#include "nsClassHashtable.h"
#include "ICameraControl.h"

namespace mozilla {

class GonkCameraParameters
{
public:
  GonkCameraParameters();
  virtual ~GonkCameraParameters();

  // IMPORTANT: This class is read and written by multiple threads --
  // ALL public methods must hold mLock, for either reading or writing,
  // for the life of their operation. Not doing so was the cause of
  // bug 928856, which was -painful- to track down.
  //
  // Return values:
  //  - see return values for GetTranslated() and SetTranslated() below.
  template<class T> nsresult
  Set(uint32_t aKey, const T& aValue)
  {
    RwLockAutoEnterWrite lock(mLock);
    nsresult rv = SetTranslated(aKey, aValue);
    mDirty = mDirty || NS_SUCCEEDED(rv);
    return rv;
  }

  template<class T> nsresult
  Get(uint32_t aKey, T& aValue)
  {
    RwLockAutoEnterRead lock(mLock);
    return GetTranslated(aKey, aValue);
  }

  bool
  TestAndClearDirtyFlag()
  {
    bool dirty;

    RwLockAutoEnterWrite lock(mLock);
    dirty = mDirty;
    mDirty = false;
    return dirty;
  }

  android::String8
  Flatten() const
  {
    RwLockAutoEnterRead lock(mLock);
    return mParams.flatten();
  }

  nsresult
  Unflatten(const android::String8& aFlatParameters)
  {
    RwLockAutoEnterWrite lock(mLock);
    mParams.unflatten(aFlatParameters);
    if (mInitialized) {
      return NS_OK;
    }

    // We call Initialize() once when the parameter set is first loaded,
    // to set up any constant values this class requires internally,
    // e.g. the exposure compensation step and limits.
    return Initialize();
  }

protected:
  PRRWLock* mLock;
  bool mDirty;
  bool mInitialized;

  // Required internal properties
  double mExposureCompensationStep;
  int32_t mExposureCompensationMinIndex;
  int32_t mExposureCompensationMaxIndex;
  nsTArray<int> mZoomRatios;
  nsTArray<nsString> mIsoModes;
  nsTArray<nsString> mSceneModes;
  nsClassHashtable<nsStringHashKey, nsCString> mIsoModeMap;

  // This subclass of android::CameraParameters just gives
  // all of the AOSP getters and setters the same signature.
  class Parameters : public android::CameraParameters
  {
  public:
    using android::CameraParameters::set;
    using android::CameraParameters::get;
    using android::CameraParameters::TRUE;
    using android::CameraParameters::FALSE;

    void set(const char* aKey, float aValue)      { setFloat(aKey, aValue); }
    void set(const char* aKey, double aValue)     { setFloat(aKey, aValue); }
    void set(const char* aKey, bool aValue)       { set(aKey, aValue ? TRUE : FALSE); }
    void get(const char* aKey, float& aRet)       { aRet = getFloat(aKey); }
    void get(const char* aKey, double& aRet)      { aRet = getFloat(aKey); }
    void get(const char* aKey, const char*& aRet) { aRet = get(aKey); }
    void get(const char* aKey, int& aRet)         { aRet = getInt(aKey); }
    void get(const char* aKey, bool& aRet)        { aRet = strcmp(get(aKey), FALSE); }

    static const char* GetTextKey(uint32_t aKey);
  };

  Parameters mParams;

  // The *Impl() templates handle converting the parameter keys from
  // their enum values to string types, if necessary. These are the
  // bottom layer accessors to mParams.
  //
  // Return values:
  //  - NS_OK on success;
  //  - NS_ERROR_NOT_IMPLEMENTED if the numeric 'aKey' value is invalid.
  template<typename T> nsresult
  SetImpl(uint32_t aKey, const T& aValue)
  {
    const char* key = Parameters::GetTextKey(aKey);
    NS_ENSURE_TRUE(key, NS_ERROR_NOT_IMPLEMENTED);

    mParams.set(key, aValue);
    return NS_OK;
  }

  template<typename T> nsresult
  GetImpl(uint32_t aKey, T& aValue)
  {
    const char* key = Parameters::GetTextKey(aKey);
    NS_ENSURE_TRUE(key, NS_ERROR_NOT_IMPLEMENTED);

    mParams.get(key, aValue);
    return NS_OK;
  }

  template<class T> nsresult
  SetImpl(const char* aKey, const T& aValue)
  {
    mParams.set(aKey, aValue);
    return NS_OK;
  }

  template<class T> nsresult
  GetImpl(const char* aKey, T& aValue)
  {
    mParams.get(aKey, aValue);
    return NS_OK;
  }

  // The *Translated() functions allow us to handle special cases;
  // for example, where the thumbnail size setting is exposed as an
  // ICameraControl::Size object, but is handled by the AOSP layer
  // as two separate parameters.
  //
  // Return values:
  //  - NS_OK on success;
  //  - NS_ERROR_INVALID_ARG if 'aValue' contains an invalid value;
  //  - NS_ERROR_NOT_IMPLEMENTED if 'aKey' is invalid;
  //  - NS_ERROR_NOT_AVAILABLE if the getter fails to retrieve a valid value,
  //      or if a setter fails because it requires one or more values that
  //      could not be retrieved;
  //  - NS_ERROR_FAILURE on unexpected internal failures.
  nsresult SetTranslated(uint32_t aKey, const nsAString& aValue);
  nsresult GetTranslated(uint32_t aKey, nsAString& aValue);
  nsresult SetTranslated(uint32_t aKey, const ICameraControl::Size& aSize);
  nsresult GetTranslated(uint32_t aKey, ICameraControl::Size& aSize);
  nsresult GetTranslated(uint32_t aKey, nsTArray<ICameraControl::Size>& aSizes);
  nsresult SetTranslated(uint32_t aKey, const nsTArray<ICameraControl::Region>& aRegions);
  nsresult GetTranslated(uint32_t aKey, nsTArray<ICameraControl::Region>& aRegions);
  nsresult SetTranslated(uint32_t aKey, const ICameraControl::Position& aPosition);
  nsresult SetTranslated(uint32_t aKey, const int64_t& aValue);
  nsresult GetTranslated(uint32_t aKey, int64_t& aValue);
  nsresult SetTranslated(uint32_t aKey, const double& aValue);
  nsresult GetTranslated(uint32_t aKey, double& aValue);
  nsresult SetTranslated(uint32_t aKey, const int& aValue);
  nsresult GetTranslated(uint32_t aKey, int& aValue);
  nsresult SetTranslated(uint32_t aKey, const uint32_t& aValue);
  nsresult GetTranslated(uint32_t aKey, uint32_t& aValue);
  nsresult SetTranslated(uint32_t aKey, const bool& aValue);
  nsresult GetTranslated(uint32_t aKey, bool& aValue);
  nsresult GetTranslated(uint32_t aKey, nsTArray<nsString>& aValues);
  nsresult GetTranslated(uint32_t aKey, nsTArray<double>& aValues);

  // Converts a string of multiple, comma-separated values into an array
  // of the appropriate type.
  //
  // Return values:
  //  - NS_OK on success;
  //  - NS_ERROR_NOT_IMPLEMENTED if 'aKey' is invalid;
  //  - NS_ERROR_NOT_AVAILABLE if a valid value could not be returned.
  template<class T> nsresult GetListAsArray(uint32_t aKey, nsTArray<T>& aArray);

  // Converts ISO values (e.g., "auto", "hjr", "100", "200", etc.) to and from
  // values understood by Gonk (e.g., "auto", "ISO_HJR", "ISO100", "ISO200",
  // respectively).
  //
  // Return values:
  //  - NS_OK on success;
  //  - NS_ERROR_INVALID_ARG if the 'aIso' argument is not a valid form.
  nsresult MapIsoToGonk(const nsAString& aIso, nsACString& aIsoOut);
  nsresult MapIsoFromGonk(const char* aIso, nsAString& aIsoOut);

  // Call once to initialize local cached values used in translating other
  // arguments between Gecko and Gonk. Always returns NS_OK.
  nsresult Initialize();

  // Returns true if we're a memory-constrained platform that requires
  // certain features to be disabled; returns false otherwise.
  static bool IsLowMemoryPlatform();
};

} // namespace mozilla

#endif // DOM_CAMERA_GONKCAMERAPARAMETERS_H