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TextBoxWidget: allow showing bits of text in bold

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Allow for embedding "tags" (invalid Unicode codepoints)
in the text string to trigger some text formatting:
for now only bolding some parts of text is possible.

Use it with fulltext search "all results" to highlight the
matched word (instead of the previously used brackets).
This commit is contained in:
poire-z
2024-01-15 16:30:14 +01:00
parent 487e5f667a
commit 43d36b2ea9
4 changed files with 71 additions and 8 deletions
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14
frontend/ui/rendertext.lua
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@@ -289,17 +289,25 @@ end
-- @int glyph index
-- @bool[opt=false] bold whether the glyph should be artificially boldened
-- @treturn glyph
function RenderText:getGlyphByIndex(face, glyphindex, bold)
function RenderText:getGlyphByIndex(face, glyphindex, bold, bolder)
if face.is_real_bold then
bold = false -- don't embolden glyphs already bold
end
local hash = "xglyph|"..face.hash.."|"..glyphindex.."|"..(bold and 1 or 0)
local hash = "xglyph|"..face.hash.."|"..glyphindex.."|"..(bold and 1 or 0)..(bolder and "x" or "")
local glyph = GlyphCache:check(hash)
if glyph then
-- cache hit
return glyph
end
local rendered_glyph = face.ftsize:renderGlyphByIndex(glyphindex, bold and face.embolden_half_strength)
local embolden_strength
if bold or bolder then
embolden_strength = face.embolden_half_strength
if bolder then
-- Even if not bold, get it bolder than the strength we'd use for bold
embolden_strength = embolden_strength * 1.5
end
end
local rendered_glyph = face.ftsize:renderGlyphByIndex(glyphindex, embolden_strength)
if not rendered_glyph then
logger.warn("error rendering glyph (glyphindex=", glyphindex, ") for face", face)
return