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box-drawing: add infrastructure for rendering box drawing characters ourselves

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* ‘term’ struct contains an array of 160 fcft glyph pointers
* the glyph pointers are lazily allocated when we need to draw a box
  drawings character
* Filtering out box drawings characters is easy - they are (except
  unicode 13, which isn’t handled yet )all in a single range.
This commit is contained in:
Daniel Eklöf 2020-12-26 16:24:16 +01:00
parent 44b32104a7
commit 7acdb3a0dd
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7 changed files with 274 additions and 1 deletions
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9
stride.h Normal file
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#pragma once
#include <pixman.h>
static inline int
stride_for_format_and_width(pixman_format_code_t format, int width)
{
return (((PIXMAN_FORMAT_BPP(format) * width + 7) / 8 + 4 - 1) & -4);
}