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affine: Revert ColorM implementation to use float64 array
This commit is contained in:
Hajime Hoshi
parent
4915531450
commit
edf336499c
@ -16,48 +16,11 @@ package affine
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import (
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"math"
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"github.com/hajimehoshi/ebiten/internal/endian"
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)
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// ColorMDim is a dimension of a ColorM.
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const ColorMDim = 5
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func uint64ToBytes(value uint64) []uint8 {
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result := make([]uint8, 8)
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if endian.IsLittle() {
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for i := 0; i < 8; i++ {
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result[i] = uint8(value)
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value >>= 8
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}
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} else {
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for i := 7; 0 <= i; i-- {
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result[i] = uint8(value)
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value >>= 8
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}
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}
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return result
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}
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func colorMValueString(values [ColorMDim - 1][ColorMDim]float64) string {
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b := make([]uint8, 0, (ColorMDim-1)*(ColorMDim)*8)
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for i := 0; i < ColorMDim-1; i++ {
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for j := 0; j < ColorMDim; j++ {
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b = append(b, uint64ToBytes(math.Float64bits(values[i][j]))...)
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}
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}
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return string(b)
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}
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var (
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colorMIdentityValue = colorMValueString([ColorMDim - 1][ColorMDim]float64{
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{1, 0, 0, 0, 0},
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{0, 1, 0, 0, 0},
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{0, 0, 1, 0, 0},
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{0, 0, 0, 1, 0},
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})
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)
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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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@ -67,22 +30,48 @@ var (
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//
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// The initial value is identity.
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type ColorM struct {
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// when values is empty, this matrix is identity.
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values string
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initialized bool
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es [(ColorMDim - 1) * (ColorMDim)]float64
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}
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func (c *ColorM) dim() int {
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return ColorMDim
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}
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func (c *ColorM) initialize() {
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c.initialized = true
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for i := 0; i < ColorMDim-1; i++ {
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c.es[i*ColorMDim+i] = 1
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}
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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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if !c.initialized {
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if i == j {
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return 1
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}
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return 0
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}
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return c.es[i*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, element float64) {
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if !c.initialized {
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c.initialize()
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}
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c.es[i*ColorMDim+j] = element
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}
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func (c *ColorM) Equals(other *ColorM) bool {
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if c.values == "" {
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c.values = colorMIdentityValue
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if !c.initialized {
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c.initialize()
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}
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if other.values == "" {
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other.values = colorMIdentityValue
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if !other.initialized {
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other.initialize()
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}
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return c.values == other.values
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return c.es == other.es
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}
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// Concat multiplies a color matrix with the other color matrix.
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@ -130,20 +119,22 @@ var (
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// Cr: [-0.5 - 0.5]
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rgbToYCbCr = ColorM{
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values: colorMValueString([ColorMDim - 1][ColorMDim]float64{
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{0.2990, 0.5870, 0.1140, 0, 0},
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{-0.1687, -0.3313, 0.5000, 0, 0},
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{0.5000, -0.4187, -0.0813, 0, 0},
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{0, 0, 0, 1, 0},
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}),
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initialized: true,
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es: [...]float64{
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0.2990, 0.5870, 0.1140, 0, 0,
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-0.1687, -0.3313, 0.5000, 0, 0,
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0.5000, -0.4187, -0.0813, 0, 0,
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0, 0, 0, 1, 0,
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},
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}
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yCbCrToRgb = ColorM{
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values: colorMValueString([ColorMDim - 1][ColorMDim]float64{
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{1, 0, 1.40200, 0, 0},
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{1, -0.34414, -0.71414, 0, 0},
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{1, 1.77200, 0, 0, 0},
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{0, 0, 0, 1, 0},
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}),
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initialized: true,
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es: [...]float64{
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1, 0, 1.40200, 0, 0,
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1, -0.34414, -0.71414, 0, 0,
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1, 1.77200, 0, 0, 0,
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0, 0, 0, 1, 0,
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},
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}
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)
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@ -157,12 +148,13 @@ func (c *ColorM) ChangeHSV(hueTheta float64, saturationScale float64, valueScale
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sin, cos := math.Sincos(hueTheta)
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c.Concat(rgbToYCbCr)
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c.Concat(ColorM{
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values: colorMValueString([ColorMDim - 1][ColorMDim]float64{
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{1, 0, 0, 0, 0},
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{0, cos, -sin, 0, 0},
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{0, sin, cos, 0, 0},
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{0, 0, 0, 1, 0},
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}),
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initialized: true,
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es: [...]float64{
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1, 0, 0, 0, 0,
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0, cos, -sin, 0, 0,
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0, sin, cos, 0, 0,
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0, 0, 0, 1, 0,
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},
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})
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s := saturationScale
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v := valueScale
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@ -184,24 +176,26 @@ func Monochrome() ColorM {
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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{
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values: colorMValueString([ColorMDim - 1][ColorMDim]float64{
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{r, 0, 0, 0, 0},
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{0, g, 0, 0, 0},
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{0, 0, b, 0, 0},
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{0, 0, 0, a, 0},
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}),
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initialized: true,
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es: [...]float64{
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r, 0, 0, 0, 0,
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0, g, 0, 0, 0,
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0, 0, b, 0, 0,
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0, 0, 0, a, 0,
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},
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}
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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{
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values: colorMValueString([ColorMDim - 1][ColorMDim]float64{
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{1, 0, 0, 0, r},
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{0, 1, 0, 0, g},
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{0, 0, 1, 0, b},
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{0, 0, 0, 1, a},
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}),
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initialized: true,
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es: [...]float64{
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1, 0, 0, 0, r,
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0, 1, 0, 0, g,
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0, 0, 1, 0, b,
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0, 0, 0, 1, a,
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},
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}
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}
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@ -1,46 +0,0 @@
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// Copyright 2016 The Ebiten Authors
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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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// +build js
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package affine
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import (
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"github.com/gopherjs/gopherjs/js"
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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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if c.values == "" {
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if i == j {
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return 1
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}
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return 0
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}
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a := js.NewArrayBuffer([]uint8(c.values))
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af64 := js.Global.Get("Float64Array").New(a)
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return af64.Index(i*ColorMDim + j).Float()
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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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if c.values == "" {
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c.values = colorMIdentityValue
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}
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a := js.NewArrayBuffer([]uint8(c.values))
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a8 := js.Global.Get("Uint8Array").New(a)
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af64 := js.Global.Get("Float64Array").New(a)
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af64.SetIndex(i*ColorMDim+j, value)
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c.values = string(a8.Interface().([]uint8))
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}
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@ -1,57 +0,0 @@
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// Copyright 2016 The Ebiten Authors
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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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// +build !js
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package affine
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import (
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"math"
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"github.com/hajimehoshi/ebiten/internal/endian"
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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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if c.values == "" {
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if i == j {
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return 1
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}
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return 0
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}
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offset := 8 * (i*ColorMDim + j)
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v := uint64(0)
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if endian.IsLittle() {
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for k := 7; 0 <= k; k-- {
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v <<= 8
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v += uint64(c.values[offset+k])
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}
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} else {
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for k := 0; k < 8; k++ {
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v <<= 8
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v += uint64(c.values[offset+k])
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}
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}
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return math.Float64frombits(v)
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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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if c.values == "" {
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c.values = colorMIdentityValue
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}
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b := uint64ToBytes(math.Float64bits(value))
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offset := 8 * (i*ColorMDim + j)
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c.values = c.values[:offset] + string(b) + c.values[offset+8:]
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}
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