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74 lines
2.1 KiB
74 lines
2.1 KiB
// Package webp provides an interface to libwebp library to decoding/encoding
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// WebP image.
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package webp
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/*
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#cgo LDFLAGS: -lwebp -lm
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#include <stdlib.h>
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#include <webp/encode.h>
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*/
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import "C"
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// ColorSpace represents encoding color space in WebP
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type ColorSpace int
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const (
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// YUV420 specifies YUV4:2:0
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YUV420 ColorSpace = C.WEBP_YUV420
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// YUV420A specifies YUV4:2:0 with alpha channel
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YUV420A ColorSpace = C.WEBP_YUV420A
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)
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// ImageHint corresponds to C.WebPImageHint.
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type ImageHint int
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const (
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HintDefault ImageHint = C.WEBP_HINT_DEFAULT
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HintPicture ImageHint = C.WEBP_HINT_PICTURE
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HintPhoto ImageHint = C.WEBP_HINT_PHOTO
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HintGraph ImageHint = C.WEBP_HINT_GRAPH
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HintLast ImageHint = C.WEBP_HINT_LAST
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)
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// Preset corresponds to C.WebPPreset.
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type Preset int
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const (
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// PresetDefault corresponds to WEBP_PRESET_DEFAULT, for default preset.
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PresetDefault Preset = C.WEBP_PRESET_DEFAULT
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// PresetPicture corresponds to WEBP_PRESET_PICTURE, for digital picture, like portrait, inner shot
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PresetPicture Preset = C.WEBP_PRESET_PICTURE
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// PresetPhoto corresponds to WEBP_PRESET_PHOTO, for outdoor photograph, with natural lighting
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PresetPhoto Preset = C.WEBP_PRESET_PHOTO
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// PresetDrawing corresponds to WEBP_PRESET_DRAWING, for hand or line drawing, with high-contrast details
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PresetDrawing Preset = C.WEBP_PRESET_DRAWING
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// PresetIcon corresponds to WEBP_PRESET_ICON, for small-sized colorful images
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PresetIcon Preset = C.WEBP_PRESET_ICON
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// PresetText corresponds to WEBP_PRESET_TEXT, for text-like
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PresetText Preset = C.WEBP_PRESET_TEXT
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)
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// FilterType corresponds to filter types in compression parameters.
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type FilterType int
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const (
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// SimpleFilter (=0, default)
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SimpleFilter FilterType = iota
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// StrongFilter (=1)
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StrongFilter
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)
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// Preprocessing corresponds to preprocessing filter parameter.
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type Preprocessing int
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const (
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// PreprocessingNone specifies to disable preprocessing filter.
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PreprocessingNone = 0
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// PreprocessingSegmentSmooth specifies segment-smooth filter.
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PreprocessingSegmentSmooth = 1
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//PreprocessingPseudoRandomDithering specifies pseudo-random dithering filter.
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PreprocessingPseudoRandomDithering = 2
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)
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