ebiten/internal/pixels/pixels.go

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// Copyright 2016 The Ebiten Authors
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//
// 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.
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package pixels
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import (
"errors"
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"image"
"image/color"
"github.com/hajimehoshi/ebiten/internal/graphics"
"github.com/hajimehoshi/ebiten/internal/graphics/opengl"
)
type drawImageHistoryItem struct {
image *graphics.Image
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vertices []int16
geom graphics.Matrix
colorm graphics.Matrix
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mode opengl.CompositeMode
}
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// Pixels represents pixels of an image for restoring when GL context is lost.
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type Pixels struct {
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// basePixels and baseColor are exclusive.
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basePixels []uint8
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baseColor color.Color
drawImageHistory []*drawImageHistoryItem
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stale bool
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}
func (p *Pixels) IsStale() bool {
return p.stale
}
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func (p *Pixels) MakeStale() {
p.basePixels = nil
p.baseColor = nil
p.drawImageHistory = nil
p.stale = true
}
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func (p *Pixels) Clear() {
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p.basePixels = nil
p.baseColor = nil
p.drawImageHistory = nil
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p.stale = false
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}
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func (p *Pixels) Fill(clr color.Color) {
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p.basePixels = nil
p.baseColor = clr
p.drawImageHistory = nil
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p.stale = false
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}
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func (p *Pixels) ReplacePixels(pixels []uint8) {
if p.basePixels == nil {
p.basePixels = make([]uint8, len(pixels))
}
copy(p.basePixels, pixels)
p.baseColor = nil
p.drawImageHistory = nil
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p.stale = false
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}
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func (p *Pixels) AppendDrawImageHistory(image *graphics.Image, vertices []int16, geom graphics.Matrix, colorm graphics.Matrix, mode opengl.CompositeMode) {
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if p.stale {
return
}
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// All images must be resolved and not stale each after frame.
// So we don't have to care if image is stale or not here.
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item := &drawImageHistoryItem{
image: image,
vertices: vertices,
geom: geom,
colorm: colorm,
mode: mode,
}
p.drawImageHistory = append(p.drawImageHistory, item)
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}
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// At returns a color value at idx.
//
// Note that this must not be called until context is available.
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// This means Pixels members must match with acutal state in VRAM.
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func (p *Pixels) At(idx int, image *graphics.Image, context *opengl.Context) (color.Color, error) {
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if p.basePixels == nil || p.drawImageHistory != nil || p.stale {
if err := p.readPixelsFromVRAM(image, context); err != nil {
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return nil, err
}
}
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r, g, b, a := p.basePixels[idx], p.basePixels[idx+1], p.basePixels[idx+2], p.basePixels[idx+3]
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return color.RGBA{r, g, b, a}, nil
}
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func (p *Pixels) DependsOn(target *graphics.Image) bool {
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if p.stale {
return false
}
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// TODO: Performance is bad when drawImageHistory is too many.
for _, c := range p.drawImageHistory {
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if c.image == target {
return true
}
}
return false
}
func (p *Pixels) readPixelsFromVRAM(image *graphics.Image, context *opengl.Context) error {
var err error
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p.basePixels, err = image.Pixels(context)
if err != nil {
return err
}
p.baseColor = nil
p.drawImageHistory = nil
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p.stale = false
return nil
}
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func (p *Pixels) ReadPixelsFromVRAMIfStale(image *graphics.Image, context *opengl.Context) error {
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if !p.stale {
return nil
}
return p.readPixelsFromVRAM(image, context)
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}
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func (p *Pixels) HasDependency() bool {
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if p.stale {
return false
}
return p.drawImageHistory != nil
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}
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// CreateImage restores *graphics.Image from the pixels using its state.
func (p *Pixels) CreateImage(context *opengl.Context, width, height int, filter opengl.Filter) (*graphics.Image, error) {
if p.stale {
return nil, errors.New("pixels: pixels must not be stale when restoring")
}
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img := image.NewRGBA(image.Rect(0, 0, width, height))
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if p.basePixels != nil {
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for j := 0; j < height; j++ {
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copy(img.Pix[j*img.Stride:], p.basePixels[j*width*4:(j+1)*width*4])
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}
}
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gimg, err := graphics.NewImageFromImage(img, filter)
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if err != nil {
return nil, err
}
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if p.baseColor != nil {
if p.basePixels != nil {
panic("not reach")
}
if err := gimg.Fill(p.baseColor); err != nil {
return nil, err
}
}
for _, c := range p.drawImageHistory {
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// c.image.impl must be already restored.
/*if c.image.impl.hasHistory() {
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panic("not reach")
}*/
if err := gimg.DrawImage(c.image, c.vertices, c.geom, c.colorm, c.mode); err != nil {
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return nil, err
}
}
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p.basePixels, err = gimg.Pixels(context)
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if err != nil {
return nil, err
}
p.baseColor = nil
p.drawImageHistory = nil
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p.stale = false
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return gimg, nil
}