[Mesa-dev] [PATCH 03/30] intel/isl: Add a helper for determining if a color is 0/1

[Jason Ekstrand]

---
 src/intel/isl/isl.c | 19 +++++++++++++++++++
 src/intel/isl/isl.h |  4 ++++
 2 files changed, 23 insertions(+)

diff --git a/src/intel/isl/isl.c b/src/intel/isl/isl.c
index 321850e..4eec2fd 100644
--- a/src/intel/isl/isl.c
+++ b/src/intel/isl/isl.c
@@ -267,6 +267,25 @@ isl_tiling_get_info(const struct isl_device *dev,
    return true;
 }
 
+bool
+isl_color_value_is_zero_one(union isl_color_value value,
+                            enum isl_format format)
+{
+   if (isl_format_has_int_channel(format)) {
+      for (unsigned i = 0; i < 4; i++) {
+         if (value.u32[i] != 0 && value.u32[i] != 1)
+            return false;
+      }
+   } else {
+      for (unsigned i = 0; i < 4; i++) {
+         if (value.f32[i] != 0.0f && value.f32[i] != 1.0f)
+            return false;
+      }
+   }
+
+   return true;
+}
+
 /**
  * @param[out] tiling is set only on success
  */
diff --git a/src/intel/isl/isl.h b/src/intel/isl/isl.h
index acc9e77..b9d8fa8 100644
--- a/src/intel/isl/isl.h
+++ b/src/intel/isl/isl.h
@@ -1370,6 +1370,10 @@ isl_extent4d(uint32_t width, uint32_t height, uint32_t depth,
    return e;
 }
 
+bool isl_color_value_is_zero_one(union isl_color_value value,
+                                 enum isl_format format);
+
+
 #define isl_surf_init(dev, surf, ...) \
    isl_surf_init_s((dev), (surf), \
                    &(struct isl_surf_init_info) {  __VA_ARGS__ });
-- 
2.5.0.400.gff86faf