mirror of
https://github.com/koreader/koreader.git
synced 2025-08-10 00:52:38 +00:00
81f99e4921
* origin/master:
using font module for getting fonts (commit f95231d789)
Password input, handling for broken documents
factored pages count out, better error and password handling
factored pages counter out of document struct
make muPDF cache size configurable from Lua
add XPS and CBZ support (muPDF provides this)
fixed bug for odd rendering widths
refactored muPDF integration to use strictly the fitz.h API
forgot Makefile change when factoring out drawcontext
fix a Lua 5.0 syntax that was deprecated in 5.1
separate DC out of pdf.c and djvu.c (cleanup)
removed obsolete page rotation handling, closes #70
allow easier customization of toolchain for libdjvu
fix: remove page number checking in displaying TOC
fix: handle LPGBCK and LPGFWD in selectmenu
103 lines
3.3 KiB
Lua
103 lines
3.3 KiB
Lua
glyphcache_max_memsize = 256*1024 -- 256kB glyphcache
|
|
glyphcache_current_memsize = 0
|
|
glyphcache = {}
|
|
glyphcache_max_age = 4096
|
|
function glyphCacheClaim(size)
|
|
if(size > glyphcache_max_memsize) then
|
|
error("too much memory claimed")
|
|
return false
|
|
end
|
|
while glyphcache_current_memsize + size > glyphcache_max_memsize do
|
|
for k, _ in pairs(glyphcache) do
|
|
if glyphcache[k].age > 0 then
|
|
glyphcache[k].age = glyphcache[k].age - 1
|
|
else
|
|
glyphcache_current_memsize = glyphcache_current_memsize - glyphcache[k].size
|
|
glyphcache[k] = nil
|
|
end
|
|
end
|
|
end
|
|
glyphcache_current_memsize = glyphcache_current_memsize + size
|
|
return true
|
|
end
|
|
function getGlyph(face, facehash, charcode)
|
|
local hash = glyphCacheHash(facehash, charcode)
|
|
if glyphcache[hash] == nil then
|
|
local glyph = face:renderGlyph(charcode)
|
|
local size = glyph.bb:getWidth() * glyph.bb:getHeight() / 2 + 32
|
|
glyphCacheClaim(size);
|
|
glyphcache[hash] = {
|
|
age = glyphcache_max_age,
|
|
size = size,
|
|
g = glyph
|
|
}
|
|
else
|
|
glyphcache[hash].age = glyphcache_max_age
|
|
end
|
|
return glyphcache[hash].g
|
|
end
|
|
function glyphCacheHash(face, charcode)
|
|
return face..'_'..charcode;
|
|
end
|
|
function clearGlyphCache()
|
|
glyphcache = {}
|
|
end
|
|
|
|
function sizeUtf8Text(face, facehash, text, kerning)
|
|
if text == nil then
|
|
print("# sizeUtf8Text called without text");
|
|
return
|
|
end
|
|
-- may still need more adaptive pen placement when kerning,
|
|
-- see: http://freetype.org/freetype2/docs/glyphs/glyphs-4.html
|
|
local pen_x = 0
|
|
local prevcharcode = 0
|
|
for uchar in string.gfind(text, "([%z\1-\127\194-\244][\128-\191]*)") do
|
|
if pen_x < buffer:getWidth() then
|
|
local charcode = util.utf8charcode(uchar)
|
|
local glyph = getglyph(face, facehash, charcode)
|
|
if kerning and prevcharcode then
|
|
local kern = face:getKerning(prevcharcode, charcode)
|
|
pen_x = pen_x + kern
|
|
print("prev:"..string.char(prevcharcode+10).." curr:"..string.char(charcode).." kern:"..kern)
|
|
buffer:addblitFrom(glyph.bb, x + pen_x + glyph.l, y - glyph.t, 0, 0, glyph.bb:getWidth(), glyph.bb:getHeight())
|
|
else
|
|
print("curr:"..string.char(charcode))
|
|
buffer:blitFrom(glyph.bb, x + pen_x + glyph.l, y - glyph.t, 0, 0, glyph.bb:getWidth(), glyph.bb:getHeight())
|
|
end
|
|
pen_x = pen_x + glyph.ax
|
|
prevcharcode = charcode
|
|
end
|
|
end
|
|
return pen_x
|
|
end
|
|
|
|
function renderUtf8Text(buffer, x, y, face, facehash, text, kerning)
|
|
if text == nil then
|
|
print("# renderUtf8Text called without text");
|
|
return
|
|
end
|
|
-- may still need more adaptive pen placement when kerning,
|
|
-- see: http://freetype.org/freetype2/docs/glyphs/glyphs-4.html
|
|
local pen_x = 0
|
|
local prevcharcode = 0
|
|
for uchar in string.gfind(text, "([%z\1-\127\194-\244][\128-\191]*)") do
|
|
if pen_x < buffer:getWidth() then
|
|
local charcode = util.utf8charcode(uchar)
|
|
local glyph = getGlyph(face, facehash, charcode)
|
|
if kerning and prevcharcode then
|
|
local kern = face:getKerning(prevcharcode, charcode)
|
|
pen_x = pen_x + kern
|
|
--print("prev:"..prevcharcode.." curr:"..charcode.." kern:"..kern)
|
|
buffer:addblitFrom(glyph.bb, x + pen_x + glyph.l, y - glyph.t, 0, 0, glyph.bb:getWidth(), glyph.bb:getHeight())
|
|
else
|
|
--print(" curr:"..charcode)
|
|
buffer:blitFrom(glyph.bb, x + pen_x + glyph.l, y - glyph.t, 0, 0, glyph.bb:getWidth(), glyph.bb:getHeight())
|
|
end
|
|
pen_x = pen_x + glyph.ax
|
|
prevcharcode = charcode
|
|
end
|
|
end
|
|
return pen_x
|
|
end
|