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webp.go
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webp.go
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package lilliput
// #cgo CFLAGS: -msse -msse2 -msse3 -msse4.1 -msse4.2 -mavx
// #cgo darwin CFLAGS: -I${SRCDIR}/deps/osx/include
// #cgo linux CFLAGS: -I${SRCDIR}/deps/linux/include
// #cgo CXXFLAGS: -std=c++11
// #cgo darwin CXXFLAGS: -I${SRCDIR}/deps/osx/include
// #cgo linux CXXFLAGS: -I${SRCDIR}/deps/linux/include
// #cgo LDFLAGS: -lopencv_core -lopencv_imgproc -lwebp -lwebpmux
// #cgo darwin LDFLAGS: -L${SRCDIR}/deps/osx/lib -L${SRCDIR}/deps/osx/share/OpenCV/3rdparty/lib
// #cgo linux LDFLAGS: -L${SRCDIR}/deps/linux/lib -L${SRCDIR}/deps/linux/share/OpenCV/3rdparty/lib
// #include "webp.hpp"
import "C"
import (
"io"
"time"
"unsafe"
)
type webpDecoder struct {
decoder C.webp_decoder
mat C.opencv_mat
buf []byte
}
type webpEncoder struct {
encoder C.webp_encoder
dstBuf []byte
icc []byte
}
func newWebpDecoder(buf []byte) (*webpDecoder, error) {
mat := C.opencv_mat_create_from_data(C.int(len(buf)), 1, C.CV_8U, unsafe.Pointer(&buf[0]), C.size_t(len(buf)))
if mat == nil {
return nil, ErrBufTooSmall
}
decoder := C.webp_decoder_create(mat)
if decoder == nil {
return nil, ErrInvalidImage
}
return &webpDecoder{
decoder: decoder,
mat: mat,
buf: buf,
}, nil
}
func (d *webpDecoder) Header() (*ImageHeader, error) {
return &ImageHeader{
width: int(C.webp_decoder_get_width(d.decoder)),
height: int(C.webp_decoder_get_height(d.decoder)),
pixelType: PixelType(C.webp_decoder_get_pixel_type(d.decoder)),
orientation: OrientationTopLeft,
numFrames: 1,
contentLength: len(d.buf),
}, nil
}
func (d *webpDecoder) Close() {
C.webp_decoder_release(d.decoder)
C.opencv_mat_release(d.mat)
d.buf = nil
}
func (d *webpDecoder) Description() string {
return "WEBP"
}
func (d *webpDecoder) Duration() time.Duration {
return time.Duration(0)
}
func (d *webpDecoder) HasSubtitles() bool {
return false
}
func (d *webpDecoder) IsStreamable() bool {
return false
}
func (d *webpDecoder) ICC() []byte {
iccDst := make([]byte, 8192)
iccLength := C.webp_decoder_get_icc(d.decoder, unsafe.Pointer(&iccDst[0]), C.size_t(cap(iccDst)))
return iccDst[:iccLength]
}
func (d *webpDecoder) DecodeTo(f *Framebuffer) error {
if f == nil {
return io.EOF
}
h, err := d.Header()
if err != nil {
return err
}
err = f.resizeMat(h.Width(), h.Height(), h.PixelType())
if err != nil {
return err
}
ret := C.webp_decoder_decode(d.decoder, f.mat)
if !ret {
return ErrDecodingFailed
}
return nil
}
func (d *webpDecoder) SkipFrame() error {
return ErrSkipNotSupported
}
func newWebpEncoder(decodedBy Decoder, dstBuf []byte) (*webpEncoder, error) {
dstBuf = dstBuf[:1]
icc := decodedBy.ICC()
var enc C.webp_encoder
if len(icc) > 0 {
enc = C.webp_encoder_create(unsafe.Pointer(&dstBuf[0]), C.size_t(cap(dstBuf)), unsafe.Pointer(&icc[0]), C.size_t(len(icc)))
} else {
enc = C.webp_encoder_create(unsafe.Pointer(&dstBuf[0]), C.size_t(cap(dstBuf)), nil, 0)
}
if enc == nil {
return nil, ErrBufTooSmall
}
return &webpEncoder{
encoder: enc,
dstBuf: dstBuf,
icc: icc,
}, nil
}
func (e *webpEncoder) Encode(f *Framebuffer, opt map[int]int) ([]byte, error) {
if f == nil {
return nil, io.EOF
}
var optList []C.int
var firstOpt *C.int
for k, v := range opt {
optList = append(optList, C.int(k))
optList = append(optList, C.int(v))
}
if len(optList) > 0 {
firstOpt = (*C.int)(unsafe.Pointer(&optList[0]))
}
length := C.webp_encoder_write(e.encoder, f.mat, firstOpt, C.size_t(len(optList)))
if length == 0 {
return nil, ErrInvalidImage
}
return e.dstBuf[:length], nil
}
func (e *webpEncoder) Close() {
C.webp_encoder_release(e.encoder)
}