Previously content handler debugging features were accessed by global
variables. This allows the setting of debugging parameters via a
content API giving per content control over debugging features.
Currently only used by the html content handler to toggle global
redraw debugging.
The frontends previously had to use an html renderer API to get the
encoding of a content. This also required the explicit checking of the
contents type rather than using the existing content API to abstract
this knowledge.
This cleans up this header and moves the functionality into more
useful places while reducing the include complexity but only pulling
in whats required.
Update the API which allows frontends to acquire the page features
(images, link urls or form elements) present at the given coordinates
within a browser window.
By making this an explicit browser_window API and using the browser.h
header for the associated data structure with a more appropriate API
naming the usage is much more obvious and contained.
Additionally the link url is now passed around as a nsurl stopping it
being converted from nsurl to text and back again several times.
The netsurf core is driven from numerous operation tables most of
which are now set through a common netsurf_register() interface. The
font and plotting interfaces are currently separate and unlike all the
other operation tables are modified for differing contexts.
This change moves the font operations alongside all the other
operations table and remove unnecessary interaction with the renderers
font internals. Further this also removes the need for css internals
to be visible in frontends.
Values returned by nscss_len2px are actually libcss fixed-points,
so convert the result to pixels. Also reduce the amount by which
the top of descendant bboxes are extended to 3/4 of the text
height, which is the maximum possible amount that the text can
protrude above the box when line-height is reduced.
Prevent leaking of table cell borders that happend when doing
border-collapse: collapse;
Error was do to cell->columns being treated as number of extra
columns spanned minus 1, rather than number of columns spanned.
Track row group that spans belong to, and compare with current
cell's row group to decide whether the previous span affects
current cell's start column.
