imagequant/imagequant.go

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package imagequant
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import (
"errors"
"unsafe"
)
/*
#cgo CFLAGS: -O3 -fno-math-errno -fopenmp -funroll-loops -fomit-frame-pointer -Wall -Wno-attributes -std=c99 -DNDEBUG -DUSE_SSE=1 -msse -fexcess-precision=fast
#cgo LDFLAGS: -fopenmp -static
#include "libimagequant.h"
*/
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import "C"
type ImageQuantErr int
var (
ErrOK = ImageQuantErr(C.LIQ_OK)
ErrQualityTooLow = ImageQuantErr(C.LIQ_QUALITY_TOO_LOW)
ErrValueOutOfRange = ImageQuantErr(C.LIQ_VALUE_OUT_OF_RANGE)
ErrOutOfMemory = ImageQuantErr(C.LIQ_OUT_OF_MEMORY)
ErrAborted = ImageQuantErr(C.LIQ_ABORTED)
ErrBitmapNotAvailable = ImageQuantErr(C.LIQ_BITMAP_NOT_AVAILABLE)
ErrBufferTooSmall = ImageQuantErr(C.LIQ_BUFFER_TOO_SMALL)
ErrInvalidPointer = ImageQuantErr(C.LIQ_INVALID_POINTER)
)
func GetLibraryVersion() int {
return int(C.liq_version())
}
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type Attributes struct {
p *C.struct_liq_attr
}
// Callers MUST call Release() on the returned object to free memory.
func NewAttributes() (*Attributes, error) {
pAttr := C.liq_attr_create()
if pAttr == nil { // nullptr
return nil, errors.New("Unsupported platform")
}
return &Attributes{p: pAttr}, nil
}
func (this *Attributes) SetMaxColors(colors int) ImageQuantErr {
ret := C.liq_set_max_colors(this.p, C.int(colors))
return ImageQuantErr(ret)
}
func (this *Attributes) GetMaxColors() int {
return int(C.liq_get_max_colors(this.p))
}
func (this *Attributes) SetQuality(minimum, maximum int) ImageQuantErr {
ret := C.liq_set_quality(this.p, C.int(minimum), C.int(maximum))
return ImageQuantErr(ret)
}
func (this *Attributes) GetMinQuality() int {
return int(C.liq_get_min_quality(this.p))
}
func (this *Attributes) GetMaxQuality() int {
return int(C.liq_get_max_quality(this.p))
}
// Free memory. Callers must not use this object after Release has been called.
func (this *Attributes) Release() {
C.liq_attr_destroy(this.p)
}
type Image struct {
p *C.struct_liq_image
}
// Callers MUST call Release() on the returned object to free memory.
func NewImage(attr *Attributes, rgba32data string, width, height int, gamma float64) *Image {
pImg := C.liq_image_create_rgba(attr.p, unsafe.Pointer(C.CString(rgba32data)), C.int(width), C.int(height), C.double(gamma))
return &Image{
p: pImg,
}
}
// Free memory. Callers must not use this object after Release has been called.
func (this *Image) Release() {
C.liq_image_destroy(this.p)
}