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Speed up the RGBA->BGRA conversion (FS#1112) 

Signed-off-by: Uli Schlachter <psychon@znc.in>
This commit is contained in:
Poggles 2013-03-17 13:07:00 +00:00 committed by Uli Schlachter
parent 2b0398c59b
commit ed763b9ad3
1 changed files with 35 additions and 26 deletions
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61
lib/naughty.lua.in
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@ -23,6 +23,11 @@ local wibox = require("wibox")
local surface = require("gears.surface")
local cairo = require("lgi").cairo
local schar = string.char
local sbyte = string.byte
local tcat = table.concat
local tins = table.insert
--- Notification library
local naughty = {}
@ -535,40 +540,44 @@ if capi.dbus then
args.icon = icon
elseif hints.icon_data or hints.image_data then
if hints.icon_data == nil then hints.icon_data = hints.image_data end
-- icon_data is an array:
-- 1 -> width, 2 -> height, 3 -> rowstride, 4 -> has alpha
-- 5 -> bits per sample, 6 -> channels, 7 -> data
local width, height, rowstride = hints.icon_data[1], hints.icon_data[2], hints.icon_data[3]
local imgdata = ""
local format, bpp
-- If has alpha (ARGB32)
if hints.icon_data[6] == 4 then
format, bpp = cairo.Format.ARGB32, 4
-- If has not alpha (RGB24)
elseif hints.icon_data[6] == 3 then
format, bpp = cairo.Format.RGB24, 3
end
-- icon_data is an array:
-- 1 -> width
-- 2 -> height
-- 3 -> rowstride
-- 4 -> has alpha
-- 5 -> bits per sample
-- 6 -> channels
-- 7 -> data
local w, h, rowstride, _, _, channels, data = unpack(hints.icon_data)
local format = cairo.Format[channels == 4 and 'ARGB32' or 'RGB24']
-- Figure out some stride magic (cairo dictates rowstride)
local stride = cairo.Format.stride_for_width(format, width)
local append = string.format("%c", 0):rep(stride - 4 * width)
local stride = cairo.Format.stride_for_width(format, w)
local append = schar(0):rep(stride - 4 * w)
local offset = 0
-- Now convert each row on its own
for y = 1, height do
for i = 1 + offset, width * bpp + offset, bpp do
imgdata = imgdata .. hints.icon_data[7]:sub(i, i + 2):reverse()
if bpp == 4 then
imgdata = imgdata .. hints.icon_data[7]:sub(i + 3, i + 3)
else
imgdata = imgdata .. string.format("%c", 255)
end
local rows = {}
for y = 1, h do
local this_row = {}
for i = 1 + offset, w * channels + offset, channels do
local R, G, B, A = sbyte(data, i, i + channels - 1)
tins(this_row, schar(B, G, R, A or 255))
end
-- Handle rowstride, offset is stride for the input, append for output
tins(this_row, append)
tins(rows, tcat(this_row))
offset = offset + rowstride
imgdata = imgdata .. append
end
args.icon = cairo.ImageSurface.create_for_data(imgdata, format,
width, height, stride)
args.icon = cairo.ImageSurface.create_for_data(tcat(rows), format,
w, h, stride)
end
if replaces_id and replaces_id ~= "" and replaces_id ~= 0 then
args.replaces_id = replaces_id