func Resize(fpath, tpath string, typ, cols, rows int) error {
var mw *C.MagickWand = C.NewMagickWand()
var cfpath = C.CString(fpath)
var ctpath = C.CString(tpath)
var etype C.ExceptionType
defer func() {
C.free(unsafe.Pointer(cfpath))
C.free(unsafe.Pointer(ctpath))
}()
defer func() {
C.ClearMagickWand(mw)
C.DestroyMagickWand(mw)
}()
if C.MagickReadImage(mw, cfpath) == C.MagickFalse {
goto ERR
}
if C.scale(mw, C.int(typ), C.int(cols), C.int(rows)) == C.MagickFalse {
goto ERR
}
if C.MagickWriteImages(mw, ctpath, C.MagickTrue) == C.MagickFalse {
goto ERR
}
return nil
ERR:
etype = C.MagickGetExceptionType(mw)
return errors.New(C.GoString(C.MagickGetException(mw, &etype)))
}
/*
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 (w *MagickWand) Exception() (string, int) {
var severity C.ExceptionType
errPtr := C.MagickGetException(w.wand, &severity)
C.MagickClearException(w.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)
}
// Returns the kind, reason and description of any error that occurs when using other methods in this API
func (mw *MagickWand) GetLastError() error {
var et C.ExceptionType
csdescription := C.MagickGetException(mw.mw, &et)
defer mw.relinquishMemory(unsafe.Pointer(csdescription))
if ExceptionType(et) != EXCEPTION_UNDEFINED {
mw.clearException()
return &MagickWandException{ExceptionType(C.int(et)), C.GoString(csdescription)}
}
return nil
}
func (self *PixelIterator) Error() error {
var exception C.ExceptionType
ptr := C.MagickGetException(self.iterator, &exception)
message := C.GoString(ptr)
C.MagickClearException(self.iterator)
C.MagickRelinquishMemory(unsafe.Pointer(ptr))
return errors.New(message)
}
/*
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
}
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
}
/*
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
}
/*
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
}
/*
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
}
/*
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
}
/*
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
}
/*
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
}
// Returns the latest error reported by the MagickWand API.
func (self Canvas) Error() error {
var t C.ExceptionType
message := C.MagickGetException(self.wand, &t)
C.MagickClearException(self.wand)
return fmt.Errorf(C.GoString(message))
}