Report

Report/uml/pma-alpha-blending.puml

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+@startuml
+title PMA alpha blending в blendPixelAtBuffer
+
+start
+:Input dst pixel, src PMA pixel,\ntransform opacity;
+if (pixel outside buffer?) then (yes)
+  stop
+endif
+
+if (replace_mode?) then (yes)
+  :dst = src;
+  stop
+endif
+
+:a = (src.a / 255) * opacity;
+:inv_a = 1 - a;
+:src_rgb = src.rgb * opacity;
+
+:dst.r = clamp(src_r + inv_a * dst.r);
+:dst.g = clamp(src_g + inv_a * dst.g);
+:dst.b = clamp(src_b + inv_a * dst.b);
+:dst.a = clamp(a*255 + inv_a * dst.a);
+
+:Store dst pixel;
+stop
+
+@enduml