commit c59c0f8a42652603da7f89e3270897cb685fe76b
author Anuj Phogat <anuj.phogat@gmail.com> Thu Jun 11 16:48:26 2015 -0700
committer Anuj Phogat <anuj.phogat@gmail.com> Fri Jul 24 10:48:58 2015 -0700
tree 3a02959f53682d65f20e73d118a8c39459b1dfed
parent 9fff00d387cacf7820c344324820cab764541762

mesa: Add a helper function _mesa_need_luminance_to_rgb_conversion()

Cc: <mesa-stable@lists.freedesktop.org>
Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>

src/mesa/main/readpix.c

diff --git a/src/mesa/main/readpix.c b/src/mesa/main/readpix.c
index 25a0987..ac46f7e 100644
--- a/src/mesa/main/readpix.c
+++ b/src/mesa/main/readpix.c
@@ -60,6 +60,24 @@
            format == GL_LUMINANCE_ALPHA_INTEGER_EXT);
 }
 
+/**
+ * Return true if the conversion L,I to RGB conversion is needed.
+ */
+GLboolean
+_mesa_need_luminance_to_rgb_conversion(GLenum srcBaseFormat,
+                                       GLenum dstBaseFormat)
+{
+   return (srcBaseFormat == GL_LUMINANCE ||
+           srcBaseFormat == GL_LUMINANCE_ALPHA ||
+           srcBaseFormat == GL_INTENSITY) &&
+          (dstBaseFormat == GL_GREEN ||
+           dstBaseFormat == GL_BLUE ||
+           dstBaseFormat == GL_RG ||
+           dstBaseFormat == GL_RGB ||
+           dstBaseFormat == GL_BGR ||
+           dstBaseFormat == GL_RGBA ||
+           dstBaseFormat == GL_BGRA);
+}
 
 /**
  * Return transfer op flags for this ReadPixels operation.