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
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
|
// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package x11driver
import (
"image"
"image/color"
"image/draw"
"log"
"sync"
"unsafe"
"github.com/jezek/xgb"
"github.com/jezek/xgb/render"
"github.com/jezek/xgb/shm"
"github.com/jezek/xgb/xproto"
"golang.org/x/exp/shiny/driver/internal/swizzle"
)
type bufferUploader interface {
upload(xd xproto.Drawable, xg xproto.Gcontext, depth uint8, dp image.Point, sr image.Rectangle)
}
type bufferImpl struct {
s *screenImpl
addr unsafe.Pointer
buf []byte
rgba image.RGBA
size image.Point
xs shm.Seg
mu sync.Mutex
nUpload uint32
released bool
cleanedUp bool
}
func (b *bufferImpl) degenerate() bool { return b.size.X == 0 || b.size.Y == 0 }
func (b *bufferImpl) Size() image.Point { return b.size }
func (b *bufferImpl) Bounds() image.Rectangle { return image.Rectangle{Max: b.size} }
func (b *bufferImpl) RGBA() *image.RGBA { return &b.rgba }
func (b *bufferImpl) preUpload() {
// Check that the program hasn't tried to modify the rgba field via the
// pointer returned by the bufferImpl.RGBA method. This check doesn't catch
// 100% of all cases; it simply tries to detect some invalid uses of a
// screen.Buffer such as:
// *buffer.RGBA() = anotherImageRGBA
if len(b.buf) != 0 && len(b.rgba.Pix) != 0 && &b.buf[0] != &b.rgba.Pix[0] {
panic("x11driver: invalid Buffer.RGBA modification")
}
b.mu.Lock()
defer b.mu.Unlock()
if b.released {
panic("x11driver: Buffer.Upload called after Buffer.Release")
}
if b.nUpload == 0 {
swizzle.BGRA(b.buf)
}
b.nUpload++
}
func (b *bufferImpl) postUpload() {
b.mu.Lock()
defer b.mu.Unlock()
b.nUpload--
if b.nUpload != 0 {
return
}
if b.released {
go b.cleanUp()
} else {
swizzle.BGRA(b.buf)
}
}
func (b *bufferImpl) Release() {
b.mu.Lock()
defer b.mu.Unlock()
if !b.released && b.nUpload == 0 {
go b.cleanUp()
}
b.released = true
}
func (b *bufferImpl) cleanUp() {
b.mu.Lock()
if b.cleanedUp {
b.mu.Unlock()
panic("x11driver: Buffer clean-up occurred twice")
}
b.cleanedUp = true
b.mu.Unlock()
b.s.mu.Lock()
delete(b.s.buffers, b.xs)
b.s.mu.Unlock()
if b.degenerate() {
return
}
shm.Detach(b.s.xc, b.xs)
if err := shmClose(b.addr); err != nil {
log.Printf("x11driver: shmClose: %v", err)
}
}
func (b *bufferImpl) upload(xd xproto.Drawable, xg xproto.Gcontext, depth uint8, dp image.Point, sr image.Rectangle) {
originalSRMin := sr.Min
sr = sr.Intersect(b.Bounds())
if sr.Empty() {
return
}
dp = dp.Add(sr.Min.Sub(originalSRMin))
b.preUpload()
b.s.mu.Lock()
b.s.nPendingUploads++
b.s.mu.Unlock()
cookie := shm.PutImage(
b.s.xc, xd, xg,
uint16(b.size.X), uint16(b.size.Y), // TotalWidth, TotalHeight,
uint16(sr.Min.X), uint16(sr.Min.Y), // SrcX, SrcY,
uint16(sr.Dx()), uint16(sr.Dy()), // SrcWidth, SrcHeight,
int16(dp.X), int16(dp.Y), // DstX, DstY,
depth, xproto.ImageFormatZPixmap,
1, b.xs, 0, // 1 means send a completion event, 0 means a zero offset.
)
completion := make(chan struct{})
b.s.mu.Lock()
b.s.uploads[cookie.Sequence] = completion
b.s.nPendingUploads--
b.s.handleCompletions()
b.s.mu.Unlock()
<-completion
b.postUpload()
}
func fill(xc *xgb.Conn, xp render.Picture, dr image.Rectangle, src color.Color, op draw.Op) {
r, g, b, a := src.RGBA()
c := render.Color{
Red: uint16(r),
Green: uint16(g),
Blue: uint16(b),
Alpha: uint16(a),
}
x, y := dr.Min.X, dr.Min.Y
if x < -0x8000 || 0x7fff < x || y < -0x8000 || 0x7fff < y {
return
}
dx, dy := dr.Dx(), dr.Dy()
if dx < 0 || 0xffff < dx || dy < 0 || 0xffff < dy {
return
}
render.FillRectangles(xc, renderOp(op), xp, c, []xproto.Rectangle{{
X: int16(x),
Y: int16(y),
Width: uint16(dx),
Height: uint16(dy),
}})
}
|
