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graphics: Bug fix: Concurrent-safe check in (*Image).At

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This commit is contained in:
Hajime Hoshi 2016-05-12 11:36:09 +09:00
parent 9d569e3e49
commit f1f3bcc257
2 changed files with 19 additions and 18 deletions
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11
image.go
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@ -63,10 +63,6 @@ func (t *delayedImageTasks) exec() error {
return nil
}
func (t *delayedImageTasks) isExecCalled() bool {
t.execCalled
}
// Image represents an image.
// The pixel format is alpha-premultiplied.
// Image implements image.Image.
@ -203,12 +199,11 @@ func (i *Image) ColorModel() color.Model {
//
// This function is concurrent-safe.
func (i *Image) At(x, y int) color.Color {
// TODO: What if At is called internaly (like from image parts?)
imageM.Lock()
defer imageM.Unlock()
if !theDelayedImageTasks.isExecCalled() {
if !currentRunContext.isRunning() {
panic("ebiten: At can't be called when the GL context is not initialized (this panic happens as of version 1.4.0-alpha)")
}
imageM.Lock()
defer imageM.Unlock()
if i.isDisposed() {
return color.Transparent
}

26
run.go
View File

@ -23,12 +23,12 @@ import (
)
type runContext struct {
isRunning bool
running bool
fps float64
newScreenWidth int
newScreenHeight int
newScreenScale int
isRunningSlowly bool
runningSlowly bool
m sync.RWMutex
}
@ -37,19 +37,25 @@ var currentRunContext runContext
func (c *runContext) startRunning() {
c.m.Lock()
defer c.m.Unlock()
c.isRunning = true
c.running = true
}
func (c *runContext) isRunning() bool {
c.m.Lock()
defer c.m.Unlock()
return c.running
}
func (c *runContext) endRunning() {
c.m.Lock()
defer c.m.Unlock()
c.isRunning = false
c.running = false
}
func (c *runContext) FPS() float64 {
c.m.RLock()
defer c.m.RUnlock()
if !c.isRunning {
if !c.running {
// TODO: Should panic here?
return 0
}
@ -65,17 +71,17 @@ func (c *runContext) updateFPS(fps float64) {
func (c *runContext) IsRunningSlowly() bool {
c.m.RLock()
defer c.m.RUnlock()
if !c.isRunning {
if !c.running {
// TODO: Should panic here?
return false
}
return c.isRunningSlowly
return c.runningSlowly
}
func (c *runContext) setRunningSlowly(isRunningSlowly bool) {
c.m.Lock()
defer c.m.Unlock()
c.isRunningSlowly = isRunningSlowly
c.runningSlowly = isRunningSlowly
}
func (c *runContext) updateScreenSize(g *graphicsContext) error {
@ -108,7 +114,7 @@ func (c *runContext) updateScreenSize(g *graphicsContext) error {
func (c *runContext) SetScreenSize(width, height int) error {
c.m.Lock()
defer c.m.Unlock()
if !c.isRunning {
if !c.running {
return errors.New("ebiten: SetScreenSize must be called during Run")
}
if width <= 0 || height <= 0 {
@ -122,7 +128,7 @@ func (c *runContext) SetScreenSize(width, height int) error {
func (c *runContext) SetScreenScale(scale int) error {
c.m.Lock()
defer c.m.Unlock()
if !c.isRunning {
if !c.running {
return errors.New("ebiten: SetScreenScale must be called during Run")
}
if scale <= 0 {