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