Camera1 shim: If there's no flash, the keys need to be null.

Previously, we set FLASH_MODE_OFF for FLASH_MODE when a flash unit
isn't available.  However, per the API documentation, the key has to
be null instead.

- Make sure that the flash mode and supported flash mode keys are null
  if there's no flash unit on start
- Don't set flash mode in later setParameters calls if there is no
  flash unit
- Map NULL value for flash mode key to FLASH_MODE_OFF for internal
  consistency.

Bug: 17660716
Change-Id: I3033682f0b882b8c2004114e2afef31662caebda

1 files changed, 13 insertions, 10 deletions

diff --git a/services/camera/libcameraservice/api1/client2/Parameters.cpp b/services/camera/libcameraservice/api1/client2/Parameters.cpp
index aa9d746..9818c96 100644
--- a/services/camera/libcameraservice/api1/client2/Parameters.cpp
+++ b/services/camera/libcameraservice/api1/client2/Parameters.cpp
@@ -643,11 +643,10 @@ status_t Parameters::initialize(const CameraMetadata *info, int deviceVersion) {
         params.set(CameraParameters::KEY_SUPPORTED_FLASH_MODES,
                 supportedFlashModes);
     } else {
-        flashMode = Parameters::FLASH_MODE_OFF;
-        params.set(CameraParameters::KEY_FLASH_MODE,
-                CameraParameters::FLASH_MODE_OFF);
-        params.set(CameraParameters::KEY_SUPPORTED_FLASH_MODES,
-                CameraParameters::FLASH_MODE_OFF);
+        // No flash means null flash mode and supported flash modes keys, so
+        // remove them just to be safe
+        params.remove(CameraParameters::KEY_FLASH_MODE);
+        params.remove(CameraParameters::KEY_SUPPORTED_FLASH_MODES);
     }
 
     camera_metadata_ro_entry_t minFocusDistance =
@@ -1617,7 +1616,9 @@ status_t Parameters::set(const String8& paramString) {
     if (validatedParams.flashMode != flashMode) {
         camera_metadata_ro_entry_t flashAvailable =
             staticInfo(ANDROID_FLASH_INFO_AVAILABLE, 1, 1);
-        if (!flashAvailable.data.u8[0] &&
+        bool isFlashAvailable =
+                flashAvailable.data.u8[0] == ANDROID_FLASH_INFO_AVAILABLE_TRUE;
+        if (!isFlashAvailable &&
                 validatedParams.flashMode != Parameters::FLASH_MODE_OFF) {
             ALOGE("%s: Requested flash mode \"%s\" is not supported: "
                     "No flash on device", __FUNCTION__,
@@ -1642,9 +1643,11 @@ status_t Parameters::set(const String8& paramString) {
                     newParams.get(CameraParameters::KEY_FLASH_MODE));
             return BAD_VALUE;
         }
-        // Update in case of override
-        newParams.set(CameraParameters::KEY_FLASH_MODE,
-                flashModeEnumToString(validatedParams.flashMode));
+        // Update in case of override, but only if flash is supported
+        if (isFlashAvailable) {
+            newParams.set(CameraParameters::KEY_FLASH_MODE,
+                    flashModeEnumToString(validatedParams.flashMode));
+        }
     }
 
     // WHITE_BALANCE
@@ -2386,7 +2389,7 @@ Parameters::Parameters::flashMode_t Parameters::flashModeStringToEnum(
         const char *flashMode) {
     return
         !flashMode ?
-            Parameters::FLASH_MODE_INVALID :
+            Parameters::FLASH_MODE_OFF :
         !strcmp(flashMode, CameraParameters::FLASH_MODE_OFF) ?
             Parameters::FLASH_MODE_OFF :
         !strcmp(flashMode, CameraParameters::FLASH_MODE_AUTO) ?