34 lines
1.0 KiB
Go
34 lines
1.0 KiB
Go
//go:build !amd64 && !arm64
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package grdp
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import "encoding/binary"
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// bgr32BatchToRGBA converts n BGRA32 pixels (4 bytes each: B,G,R,X) to RGBA.
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func bgr32BatchToRGBA(dst []byte, src []byte, n int) {
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for i := range n {
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s := i * 4
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binary.LittleEndian.PutUint32(dst[s:],
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uint32(src[s+2])|uint32(src[s+1])<<8|uint32(src[s])<<16|0xFF000000)
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}
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}
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// rgb555BatchToRGBA converts n big-endian RGB555 pixels (src, 2 bytes each)
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// to RGBA (dst, 4 bytes each). n must be valid for the slice sizes.
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func rgb555BatchToRGBA(dst []byte, src []byte, n int) {
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for i := range n {
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d := binary.BigEndian.Uint16(src[i*2:])
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binary.LittleEndian.PutUint32(dst[i*4:],
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uint32((d&0x7C00)>>7)|uint32((d&0x03E0)>>2)<<8|uint32((d&0x001F)<<3)<<16|0xFF000000)
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}
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}
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// rgb565BatchToRGBA converts n big-endian RGB565 pixels to RGBA.
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func rgb565BatchToRGBA(dst []byte, src []byte, n int) {
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for i := range n {
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d := binary.BigEndian.Uint16(src[i*2:])
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binary.LittleEndian.PutUint32(dst[i*4:],
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uint32((d&0xF800)>>8)|uint32((d&0x07E0)>>3)<<8|uint32((d&0x001F)<<3)<<16|0xFF000000)
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}
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}
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