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render: Allow cells to bleed into their neighbor

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This patch adds a `confined` flag to each cell to track if the last
rendered glyph bled into it's right neighbor.  To keep things simple,
bleeding into any other neighbor cell than the immediate right one is
not allowed.  This should cover most use cases.

Before rendering a row we now do a prepass and mark all cells unclean
that are affected by a bleeding neighbor.  If there are consecutive
bleeding cells, the whole group must be re-rendered even if only a
single cell has changed.

The patch also deprecates both old overflowing glyph options
*allow-overflowing-double-width-glyphs* and *pua-double-width* in favor
of a single new one named *overflowing-glyphs*.
This commit is contained in:
Timur Celik 2021-06-15 11:45:27 +02:00
parent 9211ee694c
commit 91801ae55d
6 changed files with 71 additions and 75 deletions
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3
config.h
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@ -245,7 +245,7 @@ struct config {
struct {
enum fcft_scaling_filter fcft_filter;
bool allow_overflowing_double_width_glyphs;
bool overflowing_glyphs;
bool grapheme_shaping;
enum {GRAPHEME_WIDTH_WCSWIDTH, GRAPHEME_WIDTH_DOUBLE} grapheme_width_method;
bool render_timer_osd;
@ -256,7 +256,6 @@ struct config {
off_t max_shm_pool_size;
float box_drawing_base_thickness;
bool box_drawing_solid_shades;
bool pua_double_width;
} tweak;
user_notifications_t notifications;