Add basic line drawing command

Add basic line drawing command

and clean up tabs in the file.

BUG=
R=travisg@google.com

Committed: db1ff1983d7af9b6aea5876e2ec6eb517bbff0ac

[cpu_(ooo_6.6-7.5), 2015-10-17 01:15:22]

cpu@chromium.org changed reviewers:
+ travisg@google.com

[cpu_(ooo_6.6-7.5), 2015-10-17 01:15:55]

Not sure why some functions look all green, outside the draw_line I only changed
tabs for spaces.

[travisg, 2015-10-17 01:21:47]

lgtm except for the formatting nits.

https://codereview.chromium.org/1411033002/diff/1/lib/gfx/gfx.c
File lib/gfx/gfx.c (right):

https://codereview.chromium.org/1411033002/diff/1/lib/gfx/gfx.c#newcode274
lib/gfx/gfx.c:274: if (dxabs >= dyabs) {
indents are 2 on this line.

https://codereview.chromium.org/1411033002/diff/1/lib/gfx/gfx.c#newcode285
lib/gfx/gfx.c:285: } else {
same here

[cpu_(ooo_6.6-7.5), 2015-10-17 01:30:37]

done, pushing in a minute once I try different targets.

[scottmg, 2015-10-17 01:31:20]

scottmg@chromium.org changed reviewers:
+ scottmg@chromium.org

[scottmg, 2015-10-17 01:31:21]

https://codereview.chromium.org/1411033002/diff/1/lib/gfx/gfx.c
File lib/gfx/gfx.c (right):

https://codereview.chromium.org/1411033002/diff/1/lib/gfx/gfx.c#newcode268
lib/gfx/gfx.c:268: uint x = dyabs >> 1;
these lines could probably use a comment (assuming x/y switch is intentional)

https://codereview.chromium.org/1411033002/diff/1/lib/gfx/gfx.c#newcode276
lib/gfx/gfx.c:276: for(uint i = 0; i < dxabs; i++) {
space before (, and below

[cpu_(ooo_6.6-7.5), 2015-10-17 01:45:38]

Committed patchset #2 (id:20001) manually as
db1ff1983d7af9b6aea5876e2ec6eb517bbff0ac (presubmit successful).