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graphics: make N a transient usage-hints bitmask

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Change the graphics protocol N key from a boolean into a usage-hints
bitmask. Define the first bit as a transient hint, allowing the terminal
to treat the image data as short-lived and apply optimizations such as
skipping disk cache writes.

Propagate the transient hint through frame coalescing and composition, so
a composed frame is transient if any contributing frame is transient.
This commit is contained in:
Matsumoto Kotaro
2026-06-19 13:18:41 +09:00
parent cc2d7a1789
commit 89946ebc07
8 changed files with 54 additions and 28 deletions
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3
kitty_tests/parser.py
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@@ -920,7 +920,7 @@ class TestParser(BaseTest):
k.setdefault(f, b'\0')
for f in ('format more id data_sz data_offset width height x_offset y_offset data_height data_width cursor_movement'
' num_cells num_lines cell_x_offset cell_y_offset z_index placement_id image_number quiet unicode_placement'
' parent_id parent_placement_id offset_from_parent_x offset_from_parent_y'
' parent_id parent_placement_id usage_hints offset_from_parent_x offset_from_parent_y'
).split():
k.setdefault(f, 0)
p = k.pop('payload', '')
@@ -943,6 +943,7 @@ class TestParser(BaseTest):
t('a=t,t=d,s=100,z=-9', payload='X', action='t', transmission_type='d', data_width=100, z_index=-9)
t('a=t,t=d,s=100,z=9', payload='payload', action='t', transmission_type='d', data_width=100, z_index=9)
t('a=t,t=d,s=100,z=9,q=2', action='t', transmission_type='d', data_width=100, z_index=9, quiet=2)
t('N=1', usage_hints=1)
e(',s=1', 'Malformed GraphicsCommand control block, invalid key character: 0x2c')
e('W=1', 'Malformed GraphicsCommand control block, invalid key character: 0x57')
e('1=1', 'Malformed GraphicsCommand control block, invalid key character: 0x31')