ebiten/imageimpl.go

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// Copyright 2016 Hajime Hoshi
//
// 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 ebiten
import (
"errors"
"fmt"
"image"
"image/color"
"runtime"
"sync"
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"github.com/hajimehoshi/ebiten/internal/graphics"
"github.com/hajimehoshi/ebiten/internal/opengl"
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"github.com/hajimehoshi/ebiten/internal/restorable"
)
type imageImpl struct {
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restorable *restorable.Image
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m sync.Mutex
}
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func checkSize(width, height int) error {
if width <= 0 {
return fmt.Errorf("ebiten: width must be more than 0")
}
if height <= 0 {
return fmt.Errorf("ebiten: height must be more than 0")
}
if width > graphics.ImageMaxSize {
return fmt.Errorf("ebiten: width must be less than or equal to %d", graphics.ImageMaxSize)
}
if height > graphics.ImageMaxSize {
return fmt.Errorf("ebiten: height must be less than or equal to %d", graphics.ImageMaxSize)
}
return nil
}
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func newImageImpl(width, height int, filter Filter, volatile bool) (*imageImpl, error) {
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if err := checkSize(width, height); err != nil {
return nil, err
}
img, err := restorable.NewImage(width, height, glFilter(filter), volatile)
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if err != nil {
return nil, err
}
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i := &imageImpl{
restorable: img,
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}
runtime.SetFinalizer(i, (*imageImpl).Dispose)
return i, nil
}
func newImageImplFromImage(source image.Image, filter Filter) (*imageImpl, error) {
size := source.Bounds().Size()
w, h := size.X, size.Y
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if err := checkSize(w, h); err != nil {
return nil, err
}
// Don't lock while manipulating an image.Image interface.
// It is necessary to copy the source image since the actual construction of
// an image is delayed and we can't expect the source image is not modified
// until the construction.
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rgbaImg := graphics.CopyImage(source)
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img, err := restorable.NewImageFromImage(rgbaImg, w, h, glFilter(filter))
if err != nil {
return nil, err
}
i := &imageImpl{
restorable: img,
}
runtime.SetFinalizer(i, (*imageImpl).Dispose)
return i, nil
}
func newScreenImageImpl(width, height int) (*imageImpl, error) {
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if err := checkSize(width, height); err != nil {
return nil, err
}
img, err := restorable.NewScreenFramebufferImage(width, height)
if err != nil {
return nil, err
}
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i := &imageImpl{
restorable: img,
}
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runtime.SetFinalizer(i, (*imageImpl).Dispose)
return i, nil
}
func (i *imageImpl) Fill(clr color.Color) error {
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i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return errors.New("ebiten: image is already disposed")
}
rgba := color.RGBAModel.Convert(clr).(color.RGBA)
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if err := i.restorable.Fill(rgba); err != nil {
return err
}
return nil
}
func (i *imageImpl) clearIfVolatile() error {
i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return nil
}
if err := i.restorable.ClearIfVolatile(); err != nil {
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return err
}
return nil
}
func (i *imageImpl) DrawImage(image *Image, options *DrawImageOptions) error {
// Calculate vertices before locking because the user can do anything in
// options.ImageParts interface without deadlock (e.g. Call Image functions).
if options == nil {
options = &DrawImageOptions{}
}
parts := options.ImageParts
if parts == nil {
// Check options.Parts for backward-compatibility.
dparts := options.Parts
if dparts != nil {
parts = imageParts(dparts)
} else {
w, h := image.impl.restorable.Size()
parts = &wholeImage{w, h}
}
}
w, h := image.impl.restorable.Size()
vs := vertices(parts, w, h, &options.GeoM.impl)
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if len(vs) == 0 {
return nil
}
if i == image.impl {
return errors.New("ebiten: Image.DrawImage: image should be different from the receiver")
}
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i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return errors.New("ebiten: image is already disposed")
}
mode := opengl.CompositeMode(options.CompositeMode)
if err := i.restorable.DrawImage(image.impl.restorable, vs, options.ColorM.impl, mode); err != nil {
return err
}
return nil
}
func (i *imageImpl) At(x, y int, context *opengl.Context) color.Color {
if context == nil {
panic("ebiten: At can't be called when the GL context is not initialized (this panic happens as of version 1.4.0-alpha)")
}
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i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return color.Transparent
}
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clr, err := i.restorable.At(x, y, context)
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if err != nil {
panic(err)
}
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return clr
}
func (i *imageImpl) resolveStalePixels(context *opengl.Context) error {
i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return nil
}
if err := i.restorable.ReadPixelsFromVRAMIfStale(context); err != nil {
return err
}
return nil
}
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func (i *imageImpl) resetPixelsIfDependingOn(target *imageImpl, context *opengl.Context) error {
i.m.Lock()
defer i.m.Unlock()
if i == target {
return nil
}
if i.restorable == nil {
return nil
}
if target.isDisposed() {
return errors.New("ebiten: target is already disposed")
}
// target is an image that is about to be tried mutating.
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// If pixels object is related to that image, the pixels must be reset.
i.restorable.MakeStaleIfDependingOn(target.restorable)
return nil
}
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func (i *imageImpl) hasDependency() bool {
i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return false
}
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return i.restorable.HasDependency()
}
func (i *imageImpl) restore(context *opengl.Context) error {
i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return nil
}
if err := i.restorable.Restore(context); err != nil {
return err
}
return nil
}
func (i *imageImpl) Dispose() error {
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i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return errors.New("ebiten: image is already disposed")
}
if err := i.restorable.Dispose(); err != nil {
return err
}
i.restorable = nil
runtime.SetFinalizer(i, nil)
return nil
}
func (i *imageImpl) ReplacePixels(p []uint8) error {
w, h := i.restorable.Size()
if l := 4 * w * h; len(p) != l {
return fmt.Errorf("ebiten: p's length must be %d", l)
}
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i.m.Lock()
defer i.m.Unlock()
if i.restorable == nil {
return errors.New("ebiten: image is already disposed")
}
w2, h2 := graphics.NextPowerOf2Int(w), graphics.NextPowerOf2Int(h)
pix := make([]uint8, 4*w2*h2)
for j := 0; j < h; j++ {
copy(pix[j*w2*4:], p[j*w*4:(j+1)*w*4])
}
if err := i.restorable.ReplacePixels(pix); err != nil {
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return err
}
return nil
}
func (i *imageImpl) isDisposed() bool {
i.m.Lock()
defer i.m.Unlock()
return i.restorable == nil
}
func (i *imageImpl) isInvalidated(context *opengl.Context) bool {
i.m.Lock()
defer i.m.Unlock()
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return i.restorable.IsInvalidated(context)
}