90 lines
3.4 KiB
Go
90 lines
3.4 KiB
Go
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// Copyright 2014 Hajime Hoshi
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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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//
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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 ebiten
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import (
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"github.com/hajimehoshi/ebiten/v2/internal/driver"
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)
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// Filter represents the type of texture filter to be used when an image is maginified or minified.
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type Filter int
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const (
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// FilterNearest represents nearest (crisp-edged) filter
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FilterNearest Filter = Filter(driver.FilterNearest)
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// FilterLinear represents linear filter
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FilterLinear Filter = Filter(driver.FilterLinear)
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// filterScreen represents a special filter for screen. Inner usage only.
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//
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// Some parameters like a color matrix or color vertex values can be ignored when filterScreen is used.
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filterScreen Filter = Filter(driver.FilterScreen)
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)
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// CompositeMode represents Porter-Duff composition mode.
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type CompositeMode int
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// This name convention follows CSS compositing: https://drafts.fxtf.org/compositing-2/.
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//
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// In the comments,
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// c_src, c_dst and c_out represent alpha-premultiplied RGB values of source, destination and output respectively. α_src and α_dst represent alpha values of source and destination respectively.
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const (
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// Regular alpha blending
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// c_out = c_src + c_dst × (1 - α_src)
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CompositeModeSourceOver CompositeMode = CompositeMode(driver.CompositeModeSourceOver)
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// c_out = 0
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CompositeModeClear CompositeMode = CompositeMode(driver.CompositeModeClear)
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// c_out = c_src
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CompositeModeCopy CompositeMode = CompositeMode(driver.CompositeModeCopy)
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// c_out = c_dst
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CompositeModeDestination CompositeMode = CompositeMode(driver.CompositeModeDestination)
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// c_out = c_src × (1 - α_dst) + c_dst
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CompositeModeDestinationOver CompositeMode = CompositeMode(driver.CompositeModeDestinationOver)
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// c_out = c_src × α_dst
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CompositeModeSourceIn CompositeMode = CompositeMode(driver.CompositeModeSourceIn)
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// c_out = c_dst × α_src
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CompositeModeDestinationIn CompositeMode = CompositeMode(driver.CompositeModeDestinationIn)
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// c_out = c_src × (1 - α_dst)
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CompositeModeSourceOut CompositeMode = CompositeMode(driver.CompositeModeSourceOut)
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// c_out = c_dst × (1 - α_src)
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CompositeModeDestinationOut CompositeMode = CompositeMode(driver.CompositeModeDestinationOut)
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// c_out = c_src × α_dst + c_dst × (1 - α_src)
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CompositeModeSourceAtop CompositeMode = CompositeMode(driver.CompositeModeSourceAtop)
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// c_out = c_src × (1 - α_dst) + c_dst × α_src
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CompositeModeDestinationAtop CompositeMode = CompositeMode(driver.CompositeModeDestinationAtop)
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// c_out = c_src × (1 - α_dst) + c_dst × (1 - α_src)
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CompositeModeXor CompositeMode = CompositeMode(driver.CompositeModeXor)
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// Sum of source and destination (a.k.a. 'plus' or 'additive')
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// c_out = c_src + c_dst
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CompositeModeLighter CompositeMode = CompositeMode(driver.CompositeModeLighter)
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// The product of source and destination (a.k.a 'multiply blend mode')
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// c_out = c_src * c_dst
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CompositeModeMultiply CompositeMode = CompositeMode(driver.CompositeModeMultiply)
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)
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