commit f1812e0b56773537760c9ae8ea45cee5ac902118
author Steve Pfetsch <spfetsch@google.com> Wed Jan 13 17:20:17 2016 -0800
committer Steve Pfetsch <spfetsch@google.com> Thu Jan 14 16:19:42 2016 -0800
tree 7c854d2dabf3f4b74860cba9d47d204a40026237
parent ed83eaacc5d4f68d6ae25c9e7c15c292e8d4b6eb

Enable color temperature developer setting

Add a switch in Developer Settings to enable "cool" color temperature
mode.

Bug: 26110238
Change-Id: I669ae4ddf58d6654b154692afc7d0689227617b2

msm8994/libhwcomposer/hwc.cpp

diff --git a/msm8994/libhwcomposer/hwc.cpp b/msm8994/libhwcomposer/hwc.cpp
index fc0842b..1e5a8a4 100644
--- a/msm8994/libhwcomposer/hwc.cpp
+++ b/msm8994/libhwcomposer/hwc.cpp
@@ -249,6 +249,34 @@
     }
 }
 
+static void hwc_configure_color_temp(hwc_composer_device_1* dev) {
+    hwc_context_t* ctx = (hwc_context_t*)(dev);
+    char value[PROPERTY_VALUE_MAX];
+    bool cool;
+
+    property_get("persist.sys.debug.color_temp", value, "x");
+    cool = (value[0] == '1');
+
+    if ((value[0] == '0' || value[0] == '1') &&
+        cool != ctx->mCoolColorTemperatureEnabled) {
+        ctx->mCoolColorTemperatureEnabled = cool;
+
+        ALOGI("Color temperature change. Cool = %d", cool ? 1 : 0);
+
+        int fd = open("/sys/class/graphics/fb0/color_temp", O_WRONLY);
+        if (fd >= 0) {
+            if (cool)
+                write(fd, "1", 2);
+            else
+                write(fd, "0", 2);
+            close(fd);
+        } else {
+            ALOGE("Failed to open color_temp file with result=%d", fd);
+        }
+    }
+}
+
+
 static int hwc_prepare_primary(hwc_composer_device_1 *dev,
         hwc_display_contents_1_t *list) {
     ATRACE_CALL();
@@ -515,6 +543,9 @@
         return -EINVAL;
     }
 
+    // Configure the color temperature
+    hwc_configure_color_temp(dev);
+
     ALOGD_IF(POWER_MODE_DEBUG, "%s: Done setting mode %d on display %d",
             __FUNCTION__, mode, dpy);
     return ret;

msm8994/libhwcomposer/hwc_utils.cpp

diff --git a/msm8994/libhwcomposer/hwc_utils.cpp b/msm8994/libhwcomposer/hwc_utils.cpp
index 98c4166..3234d65 100644
--- a/msm8994/libhwcomposer/hwc_utils.cpp
+++ b/msm8994/libhwcomposer/hwc_utils.cpp
@@ -393,6 +393,8 @@
     // Initializing boot anim completed check to false
     ctx->mDefaultModeApplied = false;
 
+    ctx->mCoolColorTemperatureEnabled = false;
+
     // Initialize gpu perfomance hint related parameters
     property_get("sys.hwc.gpu_perf_mode", value, "0");
 #ifdef QCOM_BSP

msm8994/libhwcomposer/hwc_utils.h

diff --git a/msm8994/libhwcomposer/hwc_utils.h b/msm8994/libhwcomposer/hwc_utils.h
index c9f35e5..2e4b3f4 100644
--- a/msm8994/libhwcomposer/hwc_utils.h
+++ b/msm8994/libhwcomposer/hwc_utils.h
@@ -683,6 +683,8 @@
     bool mDefaultModeApplied;
     //Manages color modes
     qhwc::ColorMode *mColorMode;
+    // Indicates whether cool color temperature is enabled.
+    bool mCoolColorTemperatureEnabled;
 };
 
 namespace qhwc {