diff options
| author | Brian Paul <[email protected]> | 2000-09-14 23:13:51 +0000 |
|---|---|---|
| committer | Brian Paul <[email protected]> | 2000-09-14 23:13:51 +0000 |
| commit | 64a23a0f9c6a08f6118f6488c191a079c43245a2 (patch) | |
| tree | dd1a4220c65492a7ae7e37166144cf47185e9cb8 /src/mesa/main/image.c | |
| parent | 23316033db12a4d0df10a7d9dbe51b409856a3ac (diff) | |
updated comments
Diffstat (limited to 'src/mesa/main/image.c')
| -rw-r--r-- | src/mesa/main/image.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/src/mesa/main/image.c b/src/mesa/main/image.c index 4b08c065c4c..2d4f3014e21 100644 --- a/src/mesa/main/image.c +++ b/src/mesa/main/image.c @@ -1,4 +1,4 @@ -/* $Id: image.c,v 1.40 2000/09/12 21:10:25 brianp Exp $ */ +/* $Id: image.c,v 1.41 2000/09/14 23:13:51 brianp Exp $ */ /* * Mesa 3-D graphics library @@ -63,6 +63,11 @@ const struct gl_pixelstore_attrib _mesa_native_packing = { /* * Flip the 8 bits in each byte of the given array. + * + * XXX try this trick to flip bytes someday: + * v = ((v & 0x55555555) << 1) | ((v >> 1) & 0x55555555); + * v = ((v & 0x33333333) << 2) | ((v >> 2) & 0x33333333); + * v = ((v & 0x0f0f0f0f) << 4) | ((v >> 4) & 0x0f0f0f0f); */ static void flip_bytes( GLubyte *p, GLuint n ) @@ -70,7 +75,7 @@ flip_bytes( GLubyte *p, GLuint n ) register GLuint i, a, b; for (i=0;i<n;i++) { - b = (GLuint) p[i]; + b = (GLuint) p[i]; /* words are often faster than bytes */ a = ((b & 0x01) << 7) | ((b & 0x02) << 5) | ((b & 0x04) << 3) | |