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gr: clamp rgb values

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This commit is contained in:
Josef Heinen 2019-01-24 20:37:33 +01:00
parent 42aa7d8d55
commit fef45dfc30
1 changed files with 5 additions and 5 deletions
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10
src/backends/gr.jl
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@ -1182,13 +1182,13 @@ function gr_display(sp::Subplot{GRBackend}, w, h, viewport_canvas)
z = z[xinds, yinds]
xmin, xmax = ignorenan_extrema(series[:x]); ymin, ymax = ignorenan_extrema(series[:y])
if eltype(z) <: Colors.AbstractGray
grey = round.(UInt8, float(z) * 255)
grey = round.(UInt8, clamp.(float(z) * 255, 0, 255))
rgba = map(c -> UInt32( 0xff000000 + UInt(c)<<16 + UInt(c)<<8 + UInt(c) ), grey)
else
rgba = map(c -> UInt32( round(UInt, alpha(c) * 255) << 24 +
round(UInt, blue(c) * 255) << 16 +
round(UInt, green(c) * 255) << 8 +
round(UInt, red(c) * 255) ), z)
rgba = map(c -> UInt32( round(UInt, clamp(alpha(c) * 255, 0, 255)) << 24 +
round(UInt, clamp(blue(c) * 255, 0, 255)) << 16 +
round(UInt, clamp(green(c) * 255, 0, 255)) << 8 +
round(UInt, clamp(red(c) * 255, 0, 255)) ), z)
end
GR.drawimage(xmin, xmax, ymax, ymin, w, h, rgba)
end