Mesa (master): mesa: add MAX_PIXEL_BYTES define

[Brian Paul]

Module: Mesa
Branch: master
Commit: db247dd7b37e22bf9545d8cb8360e06d68e50912
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=db247dd7b37e22bf9545d8cb8360e06d68e50912

Author: Brian Paul <brianp at vmware.com>
Date:   Mon Dec  5 20:40:48 2011 -0700

mesa: add MAX_PIXEL_BYTES define

In a few places we need to allocate space for some number of generic
pixels.  Use this new define instead of a magic number like 16 or
4 * sizeof(GLuint).

Reviewed-by: Jose Fonseca <jfonseca at vmware.com>
Reviewed-by: Eric Anholt <eric at anholt.net>

---

 src/mesa/main/formats.c |    2 ++
 src/mesa/main/formats.h |    8 ++++++++
 2 files changed, 10 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/formats.c b/src/mesa/main/formats.c
index 595da77..1f83a53 100644
--- a/src/mesa/main/formats.c
+++ b/src/mesa/main/formats.c
@@ -1553,6 +1553,8 @@ _mesa_get_format_bytes(gl_format format)
 {
    const struct gl_format_info *info = _mesa_get_format_info(format);
    ASSERT(info->BytesPerBlock);
+   ASSERT(info->BytesPerBlock <= MAX_PIXEL_BYTES ||
+          _mesa_is_format_compressed(format));
    return info->BytesPerBlock;
 }
 
diff --git a/src/mesa/main/formats.h b/src/mesa/main/formats.h
index 3960f02..e6b429d 100644
--- a/src/mesa/main/formats.h
+++ b/src/mesa/main/formats.h
@@ -47,6 +47,14 @@ extern "C" {
 
 
 /**
+ * Max number of bytes for any non-compressed pixel format below, or for
+ * intermediate pixel storage in Mesa.  This should never be less than
+ * 16.  Maybe 32 someday?
+ */
+#define MAX_PIXEL_BYTES 16
+
+
+/**
  * Mesa texture/renderbuffer image formats.
  */
 typedef enum