forked from mia/Aegisub
65 lines
2.1 KiB
Lua
65 lines
2.1 KiB
Lua
function render_frame(f, t)
|
|
-- Some data
|
|
local basex, basey = 100, 100
|
|
local thetext = overlua_datastring or "OverLua R0xx0rz?"
|
|
|
|
-- Create a new blank surface to draw on
|
|
local surf = cairo.image_surface_create(f.width, f.height, "argb32")
|
|
-- And a context to go with it. Drawing happens through the context.
|
|
local c = surf.create_context()
|
|
|
|
-- The source video is 16:9 anamorphic, so create a scaling matrix
|
|
local scaling = cairo.matrix_create()
|
|
scaling.init_scale(f.width/853, f.height/480)
|
|
-- And set it for the surface
|
|
c.set_matrix(scaling)
|
|
|
|
-- Create a surface of the video frame...
|
|
local fs = f.create_cairo_surface()
|
|
-- .. and blur it a bit
|
|
raster.gaussian_blur(fs, 2)
|
|
-- Then create a pattern from it, that can be used for filling shapes with
|
|
local fspattern = cairo.pattern_create_for_surface(fs)
|
|
-- Also apply the scaling matrix to the pattern
|
|
fspattern.set_matrix(scaling)
|
|
|
|
-- Prepare a few things
|
|
c.select_font_face("Gill Sans Std UltraBold", "", "bold")
|
|
c.set_font_size(42)
|
|
c.set_line_width(4)
|
|
c.set_line_join("round")
|
|
|
|
-- First stroke the text a bit above and to the left of main
|
|
c.move_to(basex-2, basey-2)
|
|
c.set_source_rgba(0.8, 0.8, 1, 0.8)
|
|
c.text_path(thetext)
|
|
c.stroke()
|
|
|
|
-- Then a bit below and to the right, so it overlaps the first stroking a bit
|
|
c.move_to(basex+2, basey+2)
|
|
c.set_source_rgba(0.4, 0.4, 0.5, 0.8)
|
|
c.text_path(thetext)
|
|
c.stroke()
|
|
|
|
-- And blur them both together, also softening the border
|
|
raster.gaussian_blur(surf, 3)
|
|
|
|
-- Now prepare the main text fill and the real location
|
|
c.move_to(basex, basey)
|
|
c.text_path(thetext)
|
|
-- First a thing black outline
|
|
c.set_source_rgba(0, 0, 0, 1)
|
|
c.set_line_width(2)
|
|
c.stroke_preserve() -- _preserve version to keep the outline
|
|
-- Then use the blurred video frame as fill source
|
|
c.set_source(fspattern)
|
|
c.fill_preserve()
|
|
-- And create a very dark colour
|
|
-- Adding this on top of the first fill will create a reddening effect
|
|
c.set_source_rgba(0.1, 0, 0, 1)
|
|
c.set_operator("add")
|
|
c.fill()
|
|
|
|
-- Finally draw the surface onto the video
|
|
f.overlay_cairo_surface(surf, 0, 0)
|
|
end
|