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[libpng17] Exit loop over tRNS array once a transparent pixel is found
(performance report by PoChun Chang).
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@ -1357,12 +1357,18 @@ png_init_palette_transformations(png_structrp png_ptr)
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/* Ignore if all the entries are opaque (unlikely!) */
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for (i=0; i<png_ptr->num_trans; ++i)
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{
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if (png_ptr->trans_alpha[i] == 255)
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continue;
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else if (png_ptr->trans_alpha[i] == 0)
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input_has_transparency = 1;
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else
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{
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input_has_transparency = 1;
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input_has_alpha = 1;
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break;
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}
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}
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}
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/* If no alpha we can optimize. */
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