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image/gif: use internal/byteorder

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This commit is contained in:
apocelipes 2024-05-11 17:47:13 +08:00
parent 74a49188d3
commit 1ad3a5d0ed
1 changed files with 9 additions and 14 deletions
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23
src/image/gif/writer.go
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@ -13,6 +13,7 @@ import (
"image/color"
"image/color/palette"
"image/draw"
"internal/byteorder"
"io"
)
@ -33,12 +34,6 @@ func log2(x int) int {
return -1
}
// Little-endian.
func writeUint16(b []uint8, u uint16) {
b[0] = uint8(u)
b[1] = uint8(u >> 8)
}
// writer is a buffered writer.
type writer interface {
Flush() error
@ -151,8 +146,8 @@ func (e *encoder) writeHeader() {
}
// Logical screen width and height.
writeUint16(e.buf[0:2], uint16(e.g.Config.Width))
writeUint16(e.buf[2:4], uint16(e.g.Config.Height))
byteorder.LePutUint16(e.buf[0:2], uint16(e.g.Config.Width))
byteorder.LePutUint16(e.buf[2:4], uint16(e.g.Config.Height))
e.write(e.buf[:4])
if p, ok := e.g.Config.ColorModel.(color.Palette); ok && len(p) > 0 {
@ -190,7 +185,7 @@ func (e *encoder) writeHeader() {
}
e.buf[0] = 0x03 // Block Size.
e.buf[1] = 0x01 // Sub-block Index.
writeUint16(e.buf[2:4], uint16(e.g.LoopCount))
byteorder.LePutUint16(e.buf[2:4], uint16(e.g.LoopCount))
e.buf[4] = 0x00 // Block Terminator.
e.write(e.buf[:5])
}
@ -276,7 +271,7 @@ func (e *encoder) writeImageBlock(pm *image.Paletted, delay int, disposal byte)
} else {
e.buf[3] = 0x00 | disposal<<2
}
writeUint16(e.buf[4:6], uint16(delay)) // Delay Time (1/100ths of a second)
byteorder.LePutUint16(e.buf[4:6], uint16(delay)) // Delay Time (1/100ths of a second)
// Transparent color index.
if transparentIndex != -1 {
@ -288,10 +283,10 @@ func (e *encoder) writeImageBlock(pm *image.Paletted, delay int, disposal byte)
e.write(e.buf[:8])
}
e.buf[0] = sImageDescriptor
writeUint16(e.buf[1:3], uint16(b.Min.X))
writeUint16(e.buf[3:5], uint16(b.Min.Y))
writeUint16(e.buf[5:7], uint16(b.Dx()))
writeUint16(e.buf[7:9], uint16(b.Dy()))
byteorder.LePutUint16(e.buf[1:3], uint16(b.Min.X))
byteorder.LePutUint16(e.buf[3:5], uint16(b.Min.Y))
byteorder.LePutUint16(e.buf[5:7], uint16(b.Dx()))
byteorder.LePutUint16(e.buf[7:9], uint16(b.Dy()))
e.write(e.buf[:9])
// To determine whether or not this frame's palette is the same as the