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restorable: Bug fix: Image must be protected with locks (#567)
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@ -23,6 +23,7 @@ import (
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"github.com/hajimehoshi/ebiten/internal/affine"
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"github.com/hajimehoshi/ebiten/internal/graphics"
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"github.com/hajimehoshi/ebiten/internal/opengl"
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"github.com/hajimehoshi/ebiten/internal/sync"
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)
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// drawImageHistoryItem is an item for history of draw-image commands.
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@ -70,6 +71,8 @@ type Image struct {
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// screen indicates whether the image is used as an actual screen.
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screen bool
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m sync.Mutex
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}
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// NewImage creates an empty image with the given size.
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@ -131,6 +134,9 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
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// For this purpuse, images should remember which part of that is used for DrawImage.
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theImages.makeStaleIfDependingOn(i)
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i.m.Lock()
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defer i.m.Unlock()
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i.image.ReplacePixels(pixels, x, y, width, height)
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if x == 0 && y == 0 && width == w && height == h {
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@ -160,11 +166,16 @@ func (i *Image) ReplacePixels(pixels []byte, x, y, width, height int) {
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// DrawImage draws a given image img to the image.
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func (i *Image) DrawImage(img *Image, sx0, sy0, sx1, sy1 int, geom *affine.GeoM, colorm *affine.ColorM, mode opengl.CompositeMode, filter graphics.Filter) {
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vs := img.vertices(sx0, sy0, sx1, sy1, geom)
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w, h := img.Size()
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vs := vertices(w, h, sx0, sy0, sx1, sy1, geom)
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if vs == nil {
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return
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}
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theImages.makeStaleIfDependingOn(i)
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i.m.Lock()
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defer i.m.Unlock()
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if img.stale || img.volatile || i.screen || !IsRestoringEnabled() {
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i.makeStale()
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} else {
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@ -210,6 +221,10 @@ func (i *Image) At(x, y int) (color.RGBA, error) {
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if x < 0 || y < 0 || w <= x || h <= y {
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return color.RGBA{}, nil
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}
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i.m.Lock()
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defer i.m.Unlock()
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if err := graphics.FlushCommands(); err != nil {
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return color.RGBA{}, err
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}
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@ -225,6 +240,9 @@ func (i *Image) At(x, y int) (color.RGBA, error) {
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// makeStaleIfDependingOn makes the image stale if the image depends on target.
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func (i *Image) makeStaleIfDependingOn(target *Image) {
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i.m.Lock()
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defer i.m.Unlock()
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if i.stale {
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return
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}
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@ -250,6 +268,10 @@ func (i *Image) resolveStale() error {
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if !IsRestoringEnabled() {
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return nil
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}
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i.m.Lock()
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defer i.m.Unlock()
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if i.volatile {
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return nil
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}
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@ -274,6 +296,9 @@ func (i *Image) dependsOn(target *Image) bool {
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// dependingImages returns all images that is depended by the image.
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func (i *Image) dependingImages() map[*Image]struct{} {
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i.m.Lock()
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defer i.m.Unlock()
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r := map[*Image]struct{}{}
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for _, c := range i.drawImageHistory {
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r[c.image] = struct{}{}
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@ -283,6 +308,9 @@ func (i *Image) dependingImages() map[*Image]struct{} {
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// hasDependency returns a boolean value indicating whether the image depends on another image.
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func (i *Image) hasDependency() bool {
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i.m.Lock()
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defer i.m.Unlock()
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if i.stale {
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return false
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}
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@ -291,6 +319,9 @@ func (i *Image) hasDependency() bool {
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// Restore restores *graphics.Image from the pixels using its state.
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func (i *Image) restore() error {
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i.m.Lock()
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defer i.m.Unlock()
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w, h := i.image.Size()
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if i.screen {
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// The screen image should also be recreated because framebuffer might
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@ -348,6 +379,10 @@ func (i *Image) restore() error {
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// After disposing, calling the function of the image causes unexpected results.
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func (i *Image) Dispose() {
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theImages.remove(i)
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i.m.Lock()
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defer i.m.Unlock()
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i.image.Dispose()
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i.image = nil
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i.basePixels = nil
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@ -364,9 +399,12 @@ func (i *Image) IsInvalidated() (bool, error) {
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if err := graphics.FlushCommands(); err != nil {
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return false, err
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}
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if !IsRestoringEnabled() {
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return false, nil
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}
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i.m.Lock()
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defer i.m.Unlock()
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return i.image.IsInvalidated(), nil
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}
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@ -43,7 +43,7 @@ func (v *verticesBackend) get() []float32 {
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return s
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}
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func (i *Image) vertices(sx0, sy0, sx1, sy1 int, geo *affine.GeoM) []float32 {
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func vertices(width, height int, sx0, sy0, sx1, sy1 int, geo *affine.GeoM) []float32 {
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if sx0 >= sx1 || sy0 >= sy1 {
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return nil
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}
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@ -58,7 +58,6 @@ func (i *Image) vertices(sx0, sy0, sx1, sy1 int, geo *affine.GeoM) []float32 {
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// it really feels like we should be able to cache this computation
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// but it may not matter.
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width, height := i.Size()
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w := 1
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h := 1
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for w < width {
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