mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-30 21:58:53 +01:00
113 lines
2.4 KiB
Go
113 lines
2.4 KiB
Go
// Copyright 2019 The Ebiten Authors
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package restorable
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import (
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"fmt"
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"image"
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"github.com/hajimehoshi/ebiten/internal/graphicscommand"
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)
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type rectToPixels struct {
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m map[image.Rectangle][]byte
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lastR image.Rectangle
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lastPix []byte
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}
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func (rtp *rectToPixels) addOrReplace(pixels []byte, x, y, width, height int) {
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if len(pixels) != 4*width*height {
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panic(fmt.Sprintf("restorable: len(pixels) must be %d but %d", 4*width*height, len(pixels)))
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}
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if rtp.m == nil {
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rtp.m = map[image.Rectangle][]byte{}
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}
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newr := image.Rect(x, y, x+width, y+height)
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for r := range rtp.m {
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if r == newr {
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// Replace the region.
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rtp.m[r] = pixels
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if r == rtp.lastR {
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rtp.lastPix = pixels
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}
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return
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}
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if r.Overlaps(newr) {
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panic(fmt.Sprintf("restorable: region (%#v) conflicted with the other region (%#v)", newr, r))
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}
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}
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// Add the region.
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rtp.m[newr] = pixels
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if newr == rtp.lastR {
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rtp.lastPix = pixels
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}
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}
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func (rtp *rectToPixels) remove(x, y, width, height int) {
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if rtp.m == nil {
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return
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}
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newr := image.Rect(x, y, x+width, y+height)
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for r := range rtp.m {
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if r == newr {
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delete(rtp.m, r)
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return
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}
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}
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}
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func (rtp *rectToPixels) at(i, j int) (byte, byte, byte, byte, bool) {
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if rtp.m == nil {
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return 0, 0, 0, 0, false
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}
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var pix []byte
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var r *image.Rectangle
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if pt := image.Pt(i, j); pt.In(rtp.lastR) {
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r = &rtp.lastR
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pix = rtp.lastPix
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} else {
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for rr := range rtp.m {
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if pt.In(rr) {
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r = &rr
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rtp.lastR = rr
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pix = rtp.m[rr]
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rtp.lastPix = pix
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break
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}
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}
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}
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if r == nil {
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return 0, 0, 0, 0, false
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}
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idx := 4 * ((j-r.Min.Y)*r.Dx() + (i - r.Min.X))
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return pix[idx], pix[idx+1], pix[idx+2], pix[idx+3], true
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}
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func (rtp *rectToPixels) apply(img *graphicscommand.Image) {
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// TODO: Isn't this too heavy? Can we merge the operations?
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for r, pix := range rtp.m {
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img.ReplacePixels(pix, r.Min.X, r.Min.Y, r.Dx(), r.Dy())
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}
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}
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