| // 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" |
| "log" |
| "sync" |
| "unsafe" |
| |
| "github.com/BurntSushi/xgb/shm" |
| |
| "golang.org/x/exp/shiny/driver/internal/swizzle" |
| ) |
| |
| 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) Size() image.Point { return b.size } |
| func (b *bufferImpl) RGBA() *image.RGBA { return &b.rgba } |
| |
| func (b *bufferImpl) preUpload() { |
| b.mu.Lock() |
| if b.released { |
| b.mu.Unlock() |
| panic("x11driver: Buffer.Upload called after Buffer.Release") |
| } |
| needsSwizzle := b.nUpload == 0 |
| b.nUpload++ |
| b.mu.Unlock() |
| |
| if needsSwizzle { |
| swizzle.BGRA(b.buf) |
| } |
| } |
| |
| func (b *bufferImpl) postUpload() { |
| b.mu.Lock() |
| b.nUpload-- |
| more := b.nUpload != 0 |
| released := b.released |
| b.mu.Unlock() |
| |
| if more { |
| return |
| } |
| if released { |
| b.cleanUp() |
| } else { |
| swizzle.BGRA(b.buf) |
| } |
| } |
| |
| func (b *bufferImpl) Release() { |
| b.mu.Lock() |
| cleanUp := !b.released && b.nUpload == 0 |
| b.released = true |
| b.mu.Unlock() |
| |
| if cleanUp { |
| b.cleanUp() |
| } |
| } |
| |
| func (b *bufferImpl) cleanUp() { |
| b.mu.Lock() |
| alreadyCleanedUp := b.cleanedUp |
| b.cleanedUp = true |
| b.mu.Unlock() |
| |
| if alreadyCleanedUp { |
| panic("x11driver: Buffer clean-up occurred twice") |
| } |
| |
| b.s.mu.Lock() |
| delete(b.s.buffers, b.xs) |
| b.s.mu.Unlock() |
| |
| shm.Detach(b.s.xc, b.xs) |
| if err := shmClose(b.addr); err != nil { |
| log.Printf("x11driver: shmClose: %v", err) |
| } |
| } |