mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
91 lines
2.8 KiB
Go
91 lines
2.8 KiB
Go
// Copyright 2014 Hajime Hoshi
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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 ebitenutil
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import (
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/internal/assets"
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"image"
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"image/color"
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"math"
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)
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type debugPrintState struct {
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textImage *ebiten.Image
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debugPrintRenderTarget *ebiten.Image
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y int
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}
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var defaultDebugPrintState = new(debugPrintState)
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func DebugPrint(r *ebiten.Image, str string) {
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defaultDebugPrintState.DebugPrint(r, str)
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}
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func (d *debugPrintState) drawText(rt *ebiten.Image, str string, x, y int, c color.Color) {
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parts := []ebiten.ImagePart{}
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locationX, locationY := 0, 0
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for _, c := range str {
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if c == '\n' {
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locationX = 0
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locationY += assets.TextImageCharHeight
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continue
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}
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code := int(c)
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const xCharNum = assets.TextImageWidth / assets.TextImageCharWidth
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srcX := (code % xCharNum) * assets.TextImageCharWidth
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srcY := (code / xCharNum) * assets.TextImageCharHeight
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dst := image.Rect(locationX, locationY, locationX+assets.TextImageCharWidth, locationY+assets.TextImageCharHeight)
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src := image.Rect(srcX, srcY, srcX+assets.TextImageCharWidth, srcY+assets.TextImageCharHeight)
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parts = append(parts, ebiten.ImagePart{Dst: dst, Src: src})
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locationX += assets.TextImageCharWidth
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}
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cc := color.NRGBA64Model.Convert(c).(color.NRGBA64)
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r := float64(cc.R) / math.MaxUint16
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g := float64(cc.G) / math.MaxUint16
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b := float64(cc.B) / math.MaxUint16
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a := float64(cc.A) / math.MaxUint16
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rt.DrawImage(d.textImage, &ebiten.DrawImageOptions{
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Parts: parts,
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GeoM: ebiten.TranslateGeo(float64(x+1), float64(y)),
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ColorM: ebiten.ScaleColor(r, g, b, a),
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})
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}
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// DebugPrint prints the given text str on the given image r.
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func (d *debugPrintState) DebugPrint(r *ebiten.Image, str string) error {
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if d.textImage == nil {
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img, err := assets.TextImage()
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if err != nil {
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return err
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}
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d.textImage, err = ebiten.NewImageFromImage(img, ebiten.FilterNearest)
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if err != nil {
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return err
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}
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}
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if d.debugPrintRenderTarget == nil {
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width, height := 256, 256
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var err error
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d.debugPrintRenderTarget, err = ebiten.NewImage(width, height, ebiten.FilterNearest)
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if err != nil {
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return err
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}
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}
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d.drawText(r, str, 1, d.y+1, color.NRGBA{0x00, 0x00, 0x00, 0x80})
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d.drawText(r, str, 0, d.y, color.NRGBA{0xff, 0xff, 0xff, 0xff})
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return nil
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}
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