[qcms] Add API to get parametric gamma curve data

third_party/qcms/src/transform_util.c

Index: third_party/qcms/src/transform_util.c
diff --git a/third_party/qcms/src/transform_util.c b/third_party/qcms/src/transform_util.c
index e60744742c393fdba7c68293066a47b1e2a0269d..c27a152d8abc6de4371a93db969abd174268cc43 100644
--- a/third_party/qcms/src/transform_util.c
+++ b/third_party/qcms/src/transform_util.c
@@ -637,3 +637,37 @@ void build_output_lut(struct curveType *trc,
         }
 
 }
+
+size_t qcms_profile_get_parametric_curve(qcms_profile *profile, qcms_trc_channel channel, float data[7])
+{
+    static const uint32_t COUNT_TO_LENGTH[5] = {1, 3, 4, 5, 7};
+    struct curveType *curve = NULL;
+    size_t size;
+
+    if (profile->color_space != RGB_SIGNATURE)
+        return 0;
+
+    switch(channel) {
+    case QCMS_TRC_RED:
+        curve = profile->redTRC;
+        break;
+    case QCMS_TRC_GREEN:
+        curve = profile->greenTRC;
+        break;
+    case QCMS_TRC_BLUE:
+        curve = profile->blueTRC;
+        break;
+    default:
+        return 0;
+    }
+
+    if (!curve || curve->type != PARAMETRIC_CURVE_TYPE)
+        return 0;
+
+    size = COUNT_TO_LENGTH[curve->count];
+
+    if (data)
+        memcpy(data, curve->parameter, size * sizeof(float));
+
+    return size;
+}