mirror of
https://github.com/hajimehoshi/ebiten.git
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143 lines
4.2 KiB
Go
143 lines
4.2 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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"fmt"
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"image/color"
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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 straight 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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_ [0]func() // Marks as non-comparable.
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}
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// String returns a string representation of ColorM.
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func (c *ColorM) String() string {
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b, t := c.impl.UnsafeElements()
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return fmt.Sprintf("[[%f, %f, %f, %f, %f], [%f, %f, %f, %f, %f], [%f, %f, %f, %f, %f], [%f, %f, %f, %f, %f]]",
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b[0], b[4], b[8], b[12], t[0],
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b[1], b[5], b[9], b[13], t[1],
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b[2], b[6], b[10], b[14], t[2],
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b[3], b[7], b[11], b[15], t[3])
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}
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// Reset resets the ColorM as identity.
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func (c *ColorM) Reset() {
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c.impl = nil
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}
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// Apply pre-multiplies a vector (r, g, b, a, 1) by the matrix
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// where r, g, b, and a are clr's values in straight-alpha format.
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// In other words, Apply calculates ColorM * (r, g, b, a, 1)^T.
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func (c *ColorM) Apply(clr color.Color) color.Color {
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return c.impl.Apply(clr)
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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 = 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 = 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 = c.impl.Scale(float32(r), float32(g), float32(b), float32(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 = c.impl.Translate(float32(r), float32(g), float32(b), float32(a))
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}
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// RotateHue rotates the hue.
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// theta represents rotating angle in radian.
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func (c *ColorM) RotateHue(theta float64) {
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c.ChangeHSV(theta, 1, 1)
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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 rotate 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 = c.impl.ChangeHSV(hueTheta, float32(saturationScale), float32(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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b, t := c.impl.UnsafeElements()
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if j < ColorMDim-1 {
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return float64(b[i+j*(ColorMDim-1)])
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}
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return float64(t[i])
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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, element float64) {
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c.impl = c.impl.SetElement(i, j, float32(element))
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}
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// Monochrome is deprecated as of 1.6.0-alpha. Use ChangeHSV(0, 0, 1) instead.
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func Monochrome() ColorM {
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c := ColorM{}
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c.ChangeHSV(0, 0, 1)
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return c
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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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c := ColorM{}
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c.Scale(r, g, b, a)
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return c
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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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c := ColorM{}
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c.Translate(r, g, b, a)
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return c
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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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c := ColorM{}
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c.RotateHue(theta)
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return c
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}
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