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102 lines
3.1 KiB
Go
102 lines
3.1 KiB
Go
// 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/internal/affine"
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)
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// ColorMDim is a dimension of a ColorM.
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const ColorMDim = affine.ColorMDim
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// A ColorM represents a matrix to transform coloring when rendering an image.
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//
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// A ColorM is applied to the source alpha color
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// while an Image's pixels' format is alpha premultiplied.
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// Before applying a matrix, a color is un-multiplied, and after applying the matrix,
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// the color is multiplied again.
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//
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// The initial value is identity.
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type ColorM struct {
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impl affine.ColorM
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}
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// Concat multiplies a color matrix with the other color matrix.
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// This is same as muptiplying the matrix other and the matrix c in this order.
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func (c *ColorM) Concat(other ColorM) {
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c.impl.Concat(other.impl)
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}
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// Add is deprecated as of 1.5.0-alpha.
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// Note that this doesn't make sense as an operation for affine matrices.
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func (c *ColorM) Add(other ColorM) {
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c.impl.Add(other.impl)
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}
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// Scale scales the matrix by (r, g, b, a).
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func (c *ColorM) Scale(r, g, b, a float64) {
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c.impl.Scale(r, g, b, a)
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}
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// Translate translates the matrix by (r, g, b, a).
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func (c *ColorM) Translate(r, g, b, a float64) {
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c.impl.Translate(r, g, b, a)
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}
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// RotateHue rotates the hue.
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func (c *ColorM) RotateHue(theta float64) {
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c.impl.RotateHue(theta)
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}
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// ChangeHSV changes HSV (Hue-Saturation-Value) values.
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// hueTheta is a radian value to ratate hue.
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// saturationScale is a value to scale saturation.
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// valueScale is a value to scale value (a.k.a. brightness).
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//
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// This conversion uses RGB to/from YCrCb conversion.
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func (c *ColorM) ChangeHSV(hueTheta float64, saturationScale float64, valueScale float64) {
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c.impl.ChangeHSV(hueTheta, saturationScale, valueScale)
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}
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// Element returns a value of a matrix at (i, j).
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func (c *ColorM) Element(i, j int) float64 {
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return c.impl.UnsafeElements()[i*affine.ColorMDim+j]
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}
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// SetElement sets an element at (i, j).
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func (c *ColorM) SetElement(i, j int, value float64) {
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c.impl.SetElement(i, j, value)
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}
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// Monochrome returns a color matrix to make an image monochrome.
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func Monochrome() ColorM {
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return ColorM{affine.Monochrome()}
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}
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// ScaleColor is deprecated as of 1.2.0-alpha. Use Scale instead.
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func ScaleColor(r, g, b, a float64) ColorM {
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return ColorM{affine.ScaleColor(r, g, b, a)}
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}
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// TranslateColor is deprecated as of 1.2.0-alpha. Use Translate instead.
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func TranslateColor(r, g, b, a float64) ColorM {
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return ColorM{affine.TranslateColor(r, g, b, a)}
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}
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// RotateHue is deprecated as of 1.2.0-alpha. Use RotateHue member function instead.
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func RotateHue(theta float64) ColorM {
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return ColorM{affine.RotateHue(theta)}
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}
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