[Mesa-dev] [PATCH 1/2] util: add util_format_is_luminance/intensity/rgb(), etc

[Brian Paul]

From: Brian Paul <brianp at vmware.com>

---
 src/gallium/auxiliary/util/u_format.c |   77 +++++++++++++++++++++++++++++++++
 src/gallium/auxiliary/util/u_format.h |   16 +++++++
 2 files changed, 93 insertions(+), 0 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_format.c b/src/gallium/auxiliary/util/u_format.c
index 34922ab..2bd3737 100644
--- a/src/gallium/auxiliary/util/u_format.c
+++ b/src/gallium/auxiliary/util/u_format.c
@@ -67,6 +67,83 @@ util_format_is_float(enum pipe_format format)
 }
 
 
+/** Test if the format contains RGB, but not alpha */
+boolean
+util_format_is_rgb(enum pipe_format format)
+{
+   const struct util_format_description *desc =
+      util_format_description(format);
+
+   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
+        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
+       desc->nr_channels == 4 &&
+       desc->swizzle[0] <= UTIL_FORMAT_SWIZZLE_W &&
+       desc->swizzle[1] <= UTIL_FORMAT_SWIZZLE_W &&
+       desc->swizzle[2] <= UTIL_FORMAT_SWIZZLE_W &&
+       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_1) {
+      return TRUE;
+   }
+   return FALSE;
+}
+
+
+boolean
+util_format_is_luminance(enum pipe_format format)
+{
+   const struct util_format_description *desc =
+      util_format_description(format);
+
+   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
+        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
+       desc->nr_channels == 1 &&
+       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_1) {
+      return TRUE;
+   }
+   return FALSE;
+}
+
+
+boolean
+util_format_is_luminance_alpha(enum pipe_format format)
+{
+   const struct util_format_description *desc =
+      util_format_description(format);
+
+   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
+        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
+       desc->nr_channels == 2 &&
+       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_Y) {
+      return TRUE;
+   }
+   return FALSE;
+}
+
+
+boolean
+util_format_is_intensity(enum pipe_format format)
+{
+   const struct util_format_description *desc =
+      util_format_description(format);
+
+   if ((desc->colorspace == UTIL_FORMAT_COLORSPACE_RGB ||
+        desc->colorspace == UTIL_FORMAT_COLORSPACE_SRGB) &&
+       desc->nr_channels == 1 &&
+       desc->swizzle[0] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[1] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[2] == UTIL_FORMAT_SWIZZLE_X &&
+       desc->swizzle[3] == UTIL_FORMAT_SWIZZLE_X) {
+      return TRUE;
+   }
+   return FALSE;
+}
+
+
 boolean
 util_format_is_supported(enum pipe_format format, unsigned bind)
 {
diff --git a/src/gallium/auxiliary/util/u_format.h b/src/gallium/auxiliary/util/u_format.h
index 3527103..957d1f7 100644
--- a/src/gallium/auxiliary/util/u_format.h
+++ b/src/gallium/auxiliary/util/u_format.h
@@ -477,6 +477,22 @@ boolean
 util_format_is_float(enum pipe_format format);
 
 
+boolean
+util_format_is_rgb(enum pipe_format format);
+
+
+boolean
+util_format_is_luminance(enum pipe_format format);
+
+
+boolean
+util_format_is_luminance_alpha(enum pipe_format format);
+
+
+boolean
+util_format_is_intensity(enum pipe_format format);
+
+
 /**
  * Whether the src format can be blitted to destation format with a simple
  * memcpy.
-- 
1.7.3.4