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71 lines
2.7 KiB
Go
71 lines
2.7 KiB
Go
// Copyright 2024 The Hugo Authors. All rights reserved.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package images
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import (
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"image"
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"image/draw"
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"github.com/disintegration/gift"
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"github.com/makeworld-the-better-one/dither/v2"
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)
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var _ gift.Filter = (*ditherFilter)(nil)
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type ditherFilter struct {
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ditherer *dither.Ditherer
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}
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var ditherMethodsErrorDiffusion = map[string]dither.ErrorDiffusionMatrix{
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"atkinson": dither.Atkinson,
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"burkes": dither.Burkes,
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"falsefloydsteinberg": dither.FalseFloydSteinberg,
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"floydsteinberg": dither.FloydSteinberg,
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"jarvisjudiceninke": dither.JarvisJudiceNinke,
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"sierra": dither.Sierra,
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"sierra2": dither.Sierra2,
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"sierra2_4a": dither.Sierra2_4A,
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"sierra3": dither.Sierra3,
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"sierralite": dither.SierraLite,
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"simple2d": dither.Simple2D,
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"stevenpigeon": dither.StevenPigeon,
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"stucki": dither.Stucki,
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"tworowsierra": dither.TwoRowSierra,
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}
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var ditherMethodsOrdered = map[string]dither.OrderedDitherMatrix{
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"clustereddot4x4": dither.ClusteredDot4x4,
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"clustereddot6x6": dither.ClusteredDot6x6,
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"clustereddot6x6_2": dither.ClusteredDot6x6_2,
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"clustereddot6x6_3": dither.ClusteredDot6x6_3,
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"clustereddot8x8": dither.ClusteredDot8x8,
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"clustereddotdiagonal16x16": dither.ClusteredDotDiagonal16x16,
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"clustereddotdiagonal6x6": dither.ClusteredDotDiagonal6x6,
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"clustereddotdiagonal8x8": dither.ClusteredDotDiagonal8x8,
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"clustereddotdiagonal8x8_2": dither.ClusteredDotDiagonal8x8_2,
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"clustereddotdiagonal8x8_3": dither.ClusteredDotDiagonal8x8_3,
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"clustereddothorizontalline": dither.ClusteredDotHorizontalLine,
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"clustereddotspiral5x5": dither.ClusteredDotSpiral5x5,
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"clustereddotverticalline": dither.ClusteredDotVerticalLine,
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"horizontal3x5": dither.Horizontal3x5,
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"vertical5x3": dither.Vertical5x3,
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}
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func (f ditherFilter) Draw(dst draw.Image, src image.Image, options *gift.Options) {
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gift.New().Draw(dst, f.ditherer.Dither(src))
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}
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func (f ditherFilter) Bounds(srcBounds image.Rectangle) image.Rectangle {
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return image.Rect(0, 0, srcBounds.Dx(), srcBounds.Dy())
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}
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