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LibGfx/PNG: Collect tRNS (transparency chunk) info for all color types
The tRNS metadata is valid for color types 0, 2 and 3, so let's collect it in each of those cases. This ensures that we produce a bitmap with an alpha channel if needed.
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@ -834,6 +834,8 @@ static bool process_PLTE(ReadonlyBytes data, PNGLoadingContext& context)
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static bool process_tRNS(ReadonlyBytes data, PNGLoadingContext& context)
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{
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switch (context.color_type) {
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case 0:
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case 2:
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case 3:
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context.palette_transparency_data.append(data.data(), data.size());
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break;
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