diff options
Diffstat (limited to 'src/image/gif/writer.go')
| -rw-r--r-- | src/image/gif/writer.go | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/src/image/gif/writer.go b/src/image/gif/writer.go index 15cd40fad..49abde704 100644 --- a/src/image/gif/writer.go +++ b/src/image/gif/writer.go @@ -233,10 +233,20 @@ func (e *encoder) writeImageBlock(pm *image.Paletted, delay int) { e.writeByte(uint8(litWidth)) // LZW Minimum Code Size. lzww := lzw.NewWriter(blockWriter{e: e}, lzw.LSB, litWidth) - _, e.err = lzww.Write(pm.Pix) - if e.err != nil { - lzww.Close() - return + if dx := b.Dx(); dx == pm.Stride { + _, e.err = lzww.Write(pm.Pix) + if e.err != nil { + lzww.Close() + return + } + } else { + for i, y := 0, b.Min.Y; y < b.Max.Y; i, y = i+pm.Stride, y+1 { + _, e.err = lzww.Write(pm.Pix[i : i+dx]) + if e.err != nil { + lzww.Close() + return + } + } } lzww.Close() e.writeByte(0x00) // Block Terminator. |