imagequant/Attributes.go

99 lines
2.1 KiB
Go

package imagequant
import (
"errors"
)
/*
#include "libimagequant.h"
*/
import "C"
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
}
const (
COLORS_MIN = 2
COLORS_MAX = 256
)
func (this *Attributes) SetMaxColors(colors int) error {
return translateError(C.liq_set_max_colors(this.p, C.int(colors)))
}
func (this *Attributes) GetMaxColors() int {
return int(C.liq_get_max_colors(this.p))
}
const (
QUALITY_MIN = 0
QUALITY_MAX = 100
)
func (this *Attributes) SetQuality(minimum, maximum int) error {
return translateError(C.liq_set_quality(this.p, C.int(minimum), C.int(maximum)))
}
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))
}
const (
SPEED_SLOWEST = 1
SPEED_DEFAULT = 3
SPEED_FASTEST = 10
)
func (this *Attributes) SetSpeed(speed int) error {
return translateError(C.liq_set_speed(this.p, C.int(speed)))
}
func (this *Attributes) GetSpeed() int {
return int(C.liq_get_speed(this.p))
}
func (this *Attributes) SetMinOpacity(min int) error {
return translateError(C.liq_set_min_opacity(this.p, C.int(min)))
}
func (this *Attributes) GetMinOpacity() int {
return int(C.liq_get_min_opacity(this.p))
}
func (this *Attributes) SetMinPosterization(bits int) error {
return translateError(C.liq_set_min_posterization(this.p, C.int(bits)))
}
func (this *Attributes) GetMinPosterization() int {
return int(C.liq_get_min_posterization(this.p))
}
func (this *Attributes) SetLastIndexTransparent(is_last int) {
C.liq_set_last_index_transparent(this.p, C.int(is_last))
}
func (this *Attributes) CreateHistogram() *Histogram {
ptr := C.liq_histogram_create(this.p)
return &Histogram{p: ptr}
}
// Free memory. Callers must not use this object after Release has been called.
func (this *Attributes) Release() {
C.liq_attr_destroy(this.p)
}