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GUI_MEMDEV_Rotate abnormal with alpha picture

Question asked by Angus Shi on Aug 5, 2019
Latest reply on Aug 6, 2019 by soledad

We want to develop analog clock on LPC54608. But when we rotate alpha needle picture by GUI_MEMDEV_Rotate API , it can't display anything. When we modified the alpha value to non zero(not 0x00 or 0xFF) in picture GUI_BITMAP data array, It can be displayed, but with shadows, How can we rotate a alpha needle picture?

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