/
pixelrecords.go
146 lines (131 loc) · 3.45 KB
/
pixelrecords.go
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
// Copyright 2019 The Ebiten Authors
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package restorable
import (
"fmt"
"image"
"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
)
type pixelsRecord struct {
rect image.Rectangle
pix []byte
}
func (p *pixelsRecord) readPixels(pixels []byte, region image.Rectangle, imageWidth, imageHeight int) {
r := p.rect.Intersect(region.Intersect(image.Rect(0, 0, imageWidth, imageHeight)))
if r.Empty() {
return
}
dstBaseX := r.Min.X - region.Min.X
dstBaseY := r.Min.Y - region.Min.Y
lineWidth := 4 * r.Dx()
if p.pix != nil {
srcBaseX := r.Min.X - p.rect.Min.X
srcBaseY := r.Min.Y - p.rect.Min.Y
for j := 0; j < r.Dy(); j++ {
dstX := 4 * ((dstBaseY+j)*region.Dx() + dstBaseX)
srcX := 4 * ((srcBaseY+j)*p.rect.Dx() + srcBaseX)
copy(pixels[dstX:dstX+lineWidth], p.pix[srcX:srcX+lineWidth])
}
} else {
for j := 0; j < r.Dy(); j++ {
dstX := 4 * ((dstBaseY+j)*region.Dx() + dstBaseX)
for i := 0; i < lineWidth; i++ {
pixels[i+dstX] = 0
}
}
}
}
type pixelsRecords struct {
records []*pixelsRecord
}
func (pr *pixelsRecords) addOrReplace(pixels []byte, region image.Rectangle) {
if len(pixels) != 4*region.Dx()*region.Dy() {
msg := fmt.Sprintf("restorable: len(pixels) must be 4*%d*%d = %d but %d", region.Dx(), region.Dy(), 4*region.Dx()*region.Dy(), len(pixels))
if pixels == nil {
msg += " (nil)"
}
panic(msg)
}
// Remove or update the duplicated records first.
var n int
for _, r := range pr.records {
if r.rect.In(region) {
continue
}
pr.records[n] = r
n++
}
for i := n; i < len(pr.records); i++ {
pr.records[i] = nil
}
pr.records = pr.records[:n]
// Add the new record.
pr.records = append(pr.records, &pixelsRecord{
rect: region,
pix: pixels,
})
}
func (pr *pixelsRecords) clear(region image.Rectangle) {
if region.Empty() {
return
}
var n int
var needsClear bool
for _, r := range pr.records {
if r.rect.In(region) {
continue
}
if r.rect.Overlaps(region) {
needsClear = true
}
pr.records[n] = r
n++
}
for i := n; i < len(pr.records); i++ {
pr.records[i] = nil
}
pr.records = pr.records[:n]
if needsClear {
pr.records = append(pr.records, &pixelsRecord{
rect: region,
})
}
}
func (pr *pixelsRecords) readPixels(pixels []byte, region image.Rectangle, imageWidth, imageHeight int) {
for i := range pixels {
pixels[i] = 0
}
for _, r := range pr.records {
r.readPixels(pixels, region, imageWidth, imageHeight)
}
}
func (pr *pixelsRecords) apply(img *graphicscommand.Image) {
// TODO: Isn't this too heavy? Can we merge the operations?
for _, r := range pr.records {
if r.pix != nil {
img.WritePixels(r.pix, r.rect)
} else {
img.WritePixels(make([]byte, 4*r.rect.Dx()*r.rect.Dy()), r.rect)
}
}
}
func (pr *pixelsRecords) appendRegions(regions []image.Rectangle) []image.Rectangle {
for _, r := range pr.records {
if r.rect.Empty() {
continue
}
regions = append(regions, r.rect)
}
return regions
}