This applies the font size inflation to reflow and painting of text
frames. However, it does not (by design) apply to intrinsic width
computation, since the inflation is itself a function of the containers
width, which can depend on the intrinsic width.
This implements computation of the font size inflation factor for a
given frame. Since Fennec does layout using a fake viewport whose width
represents a typical viewport width on the desktop and then allows users
to pan and zoom, fonts are not always readable even when zoomed. The
goal of this font size inflation is to ensure that when a block of text
is zoomed to fill the width of the device, the fonts are large enough to
read. We do this by increasing the font sizes in the page. Since this
increase is a function of the width of the text's container, the
inflation must be performed (in later patches in this series) after
style data computation and after intrinsic width computation.
The font size inflation factor does not vary *within* a block.
Since sync uses a whitelist (the services.sync.prefs.sync.* prefs) for
preferences (i.e., preferences are not synced by default), this patch
does not make any changes relating to sync, since we do not want the
inflation preferences synced across devices (since preferred settings
are likely to be device-specific).
This applies the font size inflation to reflow and painting of text
frames. However, it does not (by design) apply to intrinsic width
computation, since the inflation is itself a function of the containers
width, which can depend on the intrinsic width.
This implements computation of the font size inflation factor for a
given frame. Since Fennec does layout using a fake viewport whose width
represents a typical viewport width on the desktop and then allows users
to pan and zoom, fonts are not always readable even when zoomed. The
goal of this font size inflation is to ensure that when a block of text
is zoomed to fill the width of the device, the fonts are large enough to
read. We do this by increasing the font sizes in the page. Since this
increase is a function of the width of the text's container, the
inflation must be performed (in later patches in this series) after
style data computation and after intrinsic width computation.
The font size inflation factor does not vary *within* a block.
Since sync uses a whitelist (the services.sync.prefs.sync.* prefs) for
preferences (i.e., preferences are not synced by default), this patch
does not make any changes relating to sync, since we do not want the
inflation preferences synced across devices (since preferred settings
are likely to be device-specific).
When either the intrinsic width or the intrinsic height is 0, the
element does not have an intrinsic ratio, and thus the table that
ComputeAutoSizeWithIntrinsicDimensions is implementing technically
doesn't apply. However, it can quite straightforwardly produce the
correct results despite that, if we correctly apply the
min/max-width/height properties.
There was nothing wrong with SetFontFromStyle, except that it's just one
more API to think about (and one more API to audit and modify for font
inflation work to happen in bug 627842).
