// Returns all metadata keys from the currently loaded image.
func (self *Canvas) Metadata() map[string]string {
var n C.size_t
var i C.size_t
var value *C.char
var key *C.char
data := make(map[string]string)
cplist := C.CString("*")
properties := C.MagickGetImageProperties(self.wand, cplist, &n)
C.free(unsafe.Pointer(cplist))
for i = 0; i < n; i++ {
key = C.MagickGetPropertyName(properties, C.size_t(i))
value = C.MagickGetImageProperty(self.wand, key)
data[strings.Trim(C.GoString(key), " ")] = strings.Trim(C.GoString(value), " ")
C.MagickRelinquishMemory(unsafe.Pointer(value))
C.MagickRelinquishMemory(unsafe.Pointer(key))
}
return data
}
/* Implements direct to memory image formats. */
func (w *MagickWand) ImageBlob(length *uint) []byte {
blobPtr := unsafe.Pointer(C.MagickGetImageBlob(w.wand, (*C.size_t)(unsafe.Pointer(length))))
blob := C.GoBytes(blobPtr, C.int(int(*length)))
// need free blob memory
C.MagickRelinquishMemory(blobPtr)
return blob
}
func (img *Image) GetBytes() []byte {
size := 0
buf := C.MagickGetImageBlob(img.wand, (*C.size_t)(unsafe.Pointer(&size)))
defer C.MagickRelinquishMemory(unsafe.Pointer(buf))
return C.GoBytes(unsafe.Pointer(buf), C.int(size))
}
/*
WriteImageBlob() writes this image wand to Blob
*/
func (this *Image) WriteImageBlob() error {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "WriteImageBlob")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand == nil {
err = errors.New("error write image to blob:magickwand is nil")
return err
}
var sizep int = 0
blob := C.MagickWriteImageBlob(this.magickWand, (*C.size_t)(unsafe.Pointer(&sizep)))
if blob != nil {
defer C.free(unsafe.Pointer(blob))
} else {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err = errors.New(fmt.Sprintf("error write image to blob: %s (ExceptionType=%d)", C.GoString(descr), etype))
return err
}
this.Blob = C.GoBytes(unsafe.Pointer(blob), C.int(sizep))
return nil
}
/*
Sets the file or blob format (e.g. "BMP") to be used when a file or blob is read. Usually this is
not necessary because GraphicsMagick is able to auto-detect the format based on the file header
(or the file extension), but some formats do not use a unique header or the selection may be ambigious.
Use MagickSetImageFormat() to set the format to be used when a file or blob is to be written.
format: The file or blob format
*/
func (this *Image) SetFormat(format string) error {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "SetFormat")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand == nil {
err = errors.New("error set image format:magickwand is nil")
return err
}
var cs *C.char = C.CString(format)
defer C.free(unsafe.Pointer(cs))
status := C.MagickSetImageFormat(this.magickWand, cs)
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err = errors.New(fmt.Sprintf("error set image format: %s (ExceptionType = %d)", C.GoString(descr), etype))
return err
}
return nil
}
/*
Composite() composite one image onto another at the specified offset.
compositeImg: The composite image
x: The column offset of the composited image.
y: The row offset of the composited image.
*/
func (this *Image) Composite(compositeImg *Image, x int64, y int64) error {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "Composite")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand == nil {
err = errors.New("error composite image:magickwand is nil")
return err
}
if compositeImg.magickWand == nil {
err = errors.New("error composite image:composite image wand is nil")
return err
}
status := C.MagickCompositeImage(this.magickWand, compositeImg.magickWand, C.OverCompositeOp, C.long(x), C.long(y))
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err = errors.New(fmt.Sprintf("error composite image: %s (ExceptionType = %d)", C.GoString(descr), etype))
return err
}
return nil
}
// Returns the severity, reason, and description of any error that occurs
// when using other methods in this API.
func (p *PixelWand) Exception() (string, int) {
var severity C.ExceptionType
errPtr := C.PixelGetException(p.wand, &severity)
C.PixelClearException(p.wand)
err := C.GoString(errPtr)
C.MagickRelinquishMemory(unsafe.Pointer(errPtr))
return err, int(severity)
}
// Returns the latest error reported by the MagickWand API.
func (self *Canvas) Error() error {
var t C.ExceptionType
ptr := C.MagickGetException(self.wand, &t)
message := C.GoString(ptr)
C.MagickClearException(self.wand)
C.MagickRelinquishMemory(unsafe.Pointer(ptr))
return errors.New(message)
}
// Writes canvas to a file, returns true on success.
func (cv Canvas) GetImageBlob() []byte {
cv.Update()
var length C.size_t
data := C.MagickGetImageBlob(cv.wand, &length)
bin := C.GoBytes(unsafe.Pointer(data), C.int(length))
C.MagickRelinquishMemory(unsafe.Pointer(data))
return bin
}
// Public: export the current image into a blob. Also destroy the current wand
//
// Examples:
// im = NewMage()
// original, err := ioutil.ReadFile("test.jpg")
// success := im.ReadBlob(original)
// imageBytes := im.ExportBlob()
func (m *Mage) ExportBlob() []byte {
defer m.Destroy()
newSize := C.size_t(0)
C.MagickResetIterator(m.wand)
image := C.MagickGetImageBlob(m.wand, &newSize)
imagePointer := unsafe.Pointer(image)
defer C.MagickRelinquishMemory(imagePointer)
return C.GoBytes(imagePointer, C.int(newSize))
}
func (self *PixelIterator) Error() error {
var exception C.ExceptionType
ptr := C.PixelGetIteratorException(self.iterator, &exception)
message := C.GoString(ptr)
C.PixelClearIteratorException(self.iterator)
C.MagickRelinquishMemory(unsafe.Pointer(ptr))
return errors.New(message)
}
// Get image data as a byte array.
func (self *Canvas) GetImageBlob() ([]byte, error) {
var size C.size_t = 0
p := unsafe.Pointer(C.MagickGetImageBlob(self.wand, &size))
if size == 0 {
return nil, errors.New("Could not get image blob.")
}
blob := C.GoBytes(p, C.int(size))
C.MagickRelinquishMemory(p)
return blob, nil
}
//get image as byte array
func (self *Canvas) GetImageBlob() ([]byte, error) {
var imageSize C.size_t = 0
imageBlobPointer := unsafe.Pointer(C.MagickGetImageBlob(self.wand, &imageSize))
if imageSize == 0 {
return nil, fmt.Errorf("Could not get image blob \n")
}
goBlob := C.GoBytes(imageBlobPointer, C.int(imageSize))
C.MagickRelinquishMemory(imageBlobPointer)
return goBlob, nil
}
/*
Scale() scales the size of this image to the given dimensions.
columns: The number of columns in the scaled image.
rows: The number of rows in the scaled image
*/
func (this *Image) Scale(columns int64, rows int64) error {
if this.magickWand == nil {
return errors.New("error scale image:magickwand is nil")
}
status := C.MagickScaleImage(this.magickWand, C.ulong(columns), C.ulong(rows))
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
return errors.New(fmt.Sprintf("error scale image: %s (ExceptionType = %d)", C.GoString(descr), etype))
}
return nil
}
func (this *Image) Resize(width int64, height int64) error {
if this.magickWand == nil {
return errors.New("error resizing image:magickwand is nil")
}
status := C.MagickResizeImage(this.magickWand, C.ulong(width), C.ulong(height), C.CubicFilter, 0.5)
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
return errors.New(fmt.Sprintf("error resizing image: %s (ExceptionType = %d)", C.GoString(descr), etype))
}
return nil
}
/*
Strip() removes all profiles and text attributes from this image.
*/
func (this *Image) Strip() error {
if this.magickWand == nil {
return errors.New("error strip image:magickwand is nil")
}
status := C.MagickStripImage(this.magickWand)
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
return errors.New(fmt.Sprintf("error strip image: %s (ExceptionType = %d)", C.GoString(descr), etype))
}
return nil
}
/*
Sets the image quality factor, which determines compression options when saving the file
quality: The image quality
*/
func (this *Image) SetCompressionQuality(quality int) error {
if this.magickWand == nil {
return errors.New("error set image compression quality:magickwand is nil")
}
status := C.MagickSetCompressionQuality(this.magickWand, C.ulong(quality))
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
return errors.New(fmt.Sprintf("error set image compression quality: %s (ExceptionType = %d)", C.GoString(descr), etype))
}
return nil
}
/*
CreateWand() creates a new wand for this Image by using Blob data
*/
func (this *Image) CreateWand() error {
if this.magickWand != nil {
this.DestoryWand()
}
status := C.createWand(&this.magickWand, (*C.uchar)(unsafe.Pointer(&this.Blob[0])), C.size_t(len(this.Blob)))
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err := errors.New(fmt.Sprintf("error create magick wand: %s (ExceptionType = %d)", C.GoString(descr), etype))
this.DestoryWand()
return err
}
return nil
}
/*
Sets the file or blob format (e.g. "BMP") to be used when a file or blob is read. Usually this is
not necessary because GraphicsMagick is able to auto-detect the format based on the file header
(or the file extension), but some formats do not use a unique header or the selection may be ambigious.
Use MagickSetImageFormat() to set the format to be used when a file or blob is to be written.
format: The file or blob format
*/
func (this *Image) SetFormat(format string) error {
if this.magickWand == nil {
return errors.New("error set image format:magickwand is nil")
}
var cs *C.char = C.CString(format)
defer C.free(unsafe.Pointer(cs))
status := C.MagickSetFormat(this.magickWand, cs)
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
return errors.New(fmt.Sprintf("error set image format: %s (ExceptionType = %d)", C.GoString(descr), etype))
}
return nil
}
/*
WriteImageBlob() writes this image wand to Blob
*/
func (this *Image) WriteImageBlob() error {
if this.magickWand == nil {
return errors.New("error write image to blob:magickwand is nil")
}
var sizep int = 0
blob := C.MagickWriteImageBlob(this.magickWand, (*C.size_t)(unsafe.Pointer(&sizep)))
if blob != nil {
defer C.free(unsafe.Pointer(blob))
} else {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err := errors.New(fmt.Sprintf("error write image to blob: %s (ExceptionType=%d)", C.GoString(descr), etype))
return err
}
this.Blob = C.GoBytes(unsafe.Pointer(blob), C.int(sizep))
return nil
}
/*
Composite() composite one image onto another at the specified offset.
compositeImg: The composite image
x: The column offset of the composited image.
y: The row offset of the composited image.
*/
func (this *Image) Composite(compositeImg *Image, x int64, y int64) error {
if this.magickWand == nil {
return errors.New("error composite image:magickwand is nil")
}
if compositeImg.magickWand == nil {
return errors.New("error composite image:composite image wand is nil")
}
compositeImg.Dissolve(100)
status := C.MagickCompositeImage(this.magickWand, compositeImg.magickWand, C.OverCompositeOp, C.long(x), C.long(y))
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
return errors.New(fmt.Sprintf("error composite image: %s (ExceptionType = %d)", C.GoString(descr), etype))
}
return nil
}
/*
CreateWand() creates a new wand for this Image by using Blob data
*/
func (this *Image) CreateWand() error {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "CreateWand")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand != nil {
this.DestoryWand()
}
status := C.createWand(&this.magickWand, (*C.uchar)(unsafe.Pointer(&this.Blob[0])), C.size_t(len(this.Blob)))
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err = errors.New(fmt.Sprintf("error create magick wand: %s (ExceptionType = %d)", C.GoString(descr), etype))
this.DestoryWand()
return err
}
return nil
}
/*
GetFormat() return format of this image
*/
func (this *Image) GetFormat() (string, error) {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "GetFormat")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand == nil {
err = errors.New("error get image format:magickwand is nil")
return "", err
}
format := C.MagickGetImageFormat(this.magickWand)
if format == nil {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err = errors.New(fmt.Sprintf("error get image format: %s (ExceptionType = %d)", C.GoString(descr), etype))
return "", err
}
return C.GoString(format), nil
}
/*
Strip() removes all profiles and text attributes from this image.
*/
func (this *Image) Strip() error {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "Strip")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand == nil {
err = errors.New("error strip image:magickwand is nil")
return err
}
status := C.MagickStripImage(this.magickWand)
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err = errors.New(fmt.Sprintf("error strip image: %s (ExceptionType = %d)", C.GoString(descr), etype))
return err
}
return nil
}
/*
Resize() resizes the size of this image to the given dimensions.
width: width of the resized image
height: height of the resized image
*/
func (this *Image) Resize(width int64, height int64) error {
var err error = nil
tran := this.Cat.NewTransaction("GraphicsMagickCmd", "Resize")
defer func() {
tran.SetStatus(err)
tran.Complete()
}()
if this.magickWand == nil {
err = errors.New("error resizing image:magickwand is nil")
return err
}
status := C.MagickResizeImage(this.magickWand, C.ulong(width), C.ulong(height), C.CubicFilter, 0.5)
if status == 0 {
var etype int
descr := C.MagickGetException(this.magickWand, (*C.ExceptionType)(unsafe.Pointer(&etype)))
defer C.MagickRelinquishMemory(unsafe.Pointer(descr))
err = errors.New(fmt.Sprintf("error resizing image: %s (ExceptionType = %d)", C.GoString(descr), etype))
return err
}
return nil
}
// Relinquishes memory resources returned by such methods as MagickIdentifyImage(), MagickGetException(), etc
func (mw *MagickWand) relinquishMemory(ptr unsafe.Pointer) {
C.MagickRelinquishMemory(ptr)
}
// Implements direct to memory image formats. It returns the image as a blob
func (self Canvas) Blob(length *uint) []byte {
ptr := unsafe.Pointer(C.MagickGetImageBlob(self.wand, (*C.size_t)(unsafe.Pointer(length))))
data := C.GoBytes(ptr, C.int(*length))
C.MagickRelinquishMemory(ptr)
return data
}
// relinquishes memory resources returned by such methods as MagickIdentifyImage(), MagickGetException(), etc
func relinquishMemory(ptr unsafe.Pointer) {
if ptr != nil {
C.MagickRelinquishMemory(ptr)
}
}