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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package swizzle provides functions for converting between RGBA pixel
// formats.
package swizzle // import "golang.org/x/exp/shiny/driver/internal/swizzle"
// BGRA converts a pixel buffer between Go's RGBA and other systems' BGRA byte
// orders.
//
// It panics if the input slice length is not a multiple of 4.
func BGRA(p []byte) {
if len(p)%4 != 0 {
panic("input slice length is not a multiple of 4")
}
// Use asm code for 16- or 4-byte chunks, if supported.
if useBGRA16 {
n := len(p) &^ (16 - 1)
bgra16(p[:n])
p = p[n:]
} else if useBGRA4 {
bgra4(p)
return
}
for i := 0; i < len(p); i += 4 {
p[i+0], p[i+2] = p[i+2], p[i+0]
}
}
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