mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-13 22:47:26 +01:00
139 lines
3.4 KiB
Go
139 lines
3.4 KiB
Go
// Copyright 2019 The Ebiten Authors
|
|
//
|
|
// 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 restorable
|
|
|
|
import (
|
|
"fmt"
|
|
"image"
|
|
|
|
"github.com/hajimehoshi/ebiten/v2/internal/graphicscommand"
|
|
)
|
|
|
|
type pixelsRecord struct {
|
|
rect image.Rectangle
|
|
pix []byte
|
|
}
|
|
|
|
func (p *pixelsRecord) clearIfOverlapped(rect image.Rectangle) {
|
|
r := p.rect.Intersect(rect)
|
|
ox := r.Min.X - p.rect.Min.X
|
|
oy := r.Min.Y - p.rect.Min.Y
|
|
w := p.rect.Dx()
|
|
for j := 0; j < r.Dy(); j++ {
|
|
for i := 0; i < r.Dx(); i++ {
|
|
idx := 4 * ((oy+j)*w + ox + i)
|
|
p.pix[idx] = 0
|
|
p.pix[idx+1] = 0
|
|
p.pix[idx+2] = 0
|
|
p.pix[idx+3] = 0
|
|
}
|
|
}
|
|
}
|
|
|
|
func (p *pixelsRecord) readPixels(pixels []byte, x, y, width, height, imageWidth, imageHeight int) {
|
|
r := p.rect.Intersect(image.Rect(x, y, x+width, y+height)).Intersect(image.Rect(0, 0, imageWidth, imageHeight))
|
|
if r.Empty() {
|
|
return
|
|
}
|
|
|
|
dstBaseX := r.Min.X - x
|
|
dstBaseY := r.Min.Y - y
|
|
srcBaseX := r.Min.X - p.rect.Min.X
|
|
srcBaseY := r.Min.Y - p.rect.Min.Y
|
|
lineWidth := 4 * r.Dx()
|
|
for j := 0; j < r.Dy(); j++ {
|
|
dstX := 4 * ((dstBaseY+j)*width + dstBaseX)
|
|
srcX := 4 * ((srcBaseY+j)*p.rect.Dx() + srcBaseX)
|
|
copy(pixels[dstX:dstX+lineWidth], p.pix[srcX:srcX+lineWidth])
|
|
}
|
|
}
|
|
|
|
type pixelsRecords struct {
|
|
records []*pixelsRecord
|
|
}
|
|
|
|
func (pr *pixelsRecords) addOrReplace(pixels []byte, x, y, width, height int) {
|
|
if len(pixels) != 4*width*height {
|
|
msg := fmt.Sprintf("restorable: len(pixels) must be 4*%d*%d = %d but %d", width, height, 4*width*height, len(pixels))
|
|
if pixels == nil {
|
|
msg += " (nil)"
|
|
}
|
|
panic(msg)
|
|
}
|
|
|
|
rect := image.Rect(x, y, x+width, y+height)
|
|
|
|
// Remove or update the duplicated records first.
|
|
var n int
|
|
for _, r := range pr.records {
|
|
if r.rect.In(rect) {
|
|
continue
|
|
}
|
|
pr.records[n] = r
|
|
n++
|
|
}
|
|
for i := n; i < len(pr.records); i++ {
|
|
pr.records[i] = nil
|
|
}
|
|
pr.records = pr.records[:n]
|
|
|
|
// Add the new record.
|
|
pr.records = append(pr.records, &pixelsRecord{
|
|
rect: rect,
|
|
pix: pixels,
|
|
})
|
|
}
|
|
|
|
func (pr *pixelsRecords) clear(x, y, width, height int) {
|
|
newr := image.Rect(x, y, x+width, y+height)
|
|
var n int
|
|
for _, r := range pr.records {
|
|
if r.rect.In(newr) {
|
|
continue
|
|
}
|
|
r.clearIfOverlapped(newr)
|
|
pr.records[n] = r
|
|
n++
|
|
}
|
|
for i := n; i < len(pr.records); i++ {
|
|
pr.records[i] = nil
|
|
}
|
|
pr.records = pr.records[:n]
|
|
}
|
|
|
|
func (pr *pixelsRecords) readPixels(pixels []byte, x, y, width, height, imageWidth, imageHeight int) {
|
|
for i := range pixels {
|
|
pixels[i] = 0
|
|
}
|
|
for _, r := range pr.records {
|
|
r.readPixels(pixels, x, y, width, height, imageWidth, imageHeight)
|
|
}
|
|
}
|
|
|
|
func (pr *pixelsRecords) apply(img *graphicscommand.Image) {
|
|
// TODO: Isn't this too heavy? Can we merge the operations?
|
|
for _, r := range pr.records {
|
|
img.WritePixels(r.pix, r.rect.Min.X, r.rect.Min.Y, r.rect.Dx(), r.rect.Dy())
|
|
}
|
|
}
|
|
|
|
func (pr *pixelsRecords) region() image.Rectangle {
|
|
var rect image.Rectangle
|
|
for _, r := range pr.records {
|
|
rect = rect.Union(r.rect)
|
|
}
|
|
return rect
|
|
}
|