mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-11-10 13:07:26 +01:00
91 lines
2.4 KiB
Go
91 lines
2.4 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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"image"
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"image/color"
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"math"
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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil/internal/assets"
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)
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type debugPrintState struct {
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textImage *ebiten.Image
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}
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var defaultDebugPrintState = &debugPrintState{}
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// DebugPrint draws the string str on the image.
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//
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// The available runes are in U+0000 to U+00FF, which is C0 Controls and Basic Latin and C1 Controls and Latin-1 Supplement.
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//
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// DebugPrint always returns nil as of 1.5.0-alpha.
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func DebugPrint(image *ebiten.Image, str string) error {
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defaultDebugPrintState.DebugPrint(image, str)
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return nil
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}
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func (d *debugPrintState) drawText(rt *ebiten.Image, str string, ox, oy int, c color.Color) {
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op := &ebiten.DrawImageOptions{}
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ur, ug, ub, ua := c.RGBA()
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const max = math.MaxUint16
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r := float64(ur) / max
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g := float64(ug) / max
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b := float64(ub) / max
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a := float64(ua) / max
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if 0 < a {
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r /= a
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g /= a
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b /= a
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}
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op.ColorM.Scale(r, g, b, a)
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x := 0
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y := 0
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w, _ := d.textImage.Size()
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for _, c := range str {
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const (
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cw = assets.CharWidth
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ch = assets.CharHeight
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)
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if c == '\n' {
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x = 0
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y += ch
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continue
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}
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n := w / cw
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sx := (int(c) % n) * cw
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sy := (int(c) / n) * ch
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r := image.Rect(sx, sy, sx+cw, sy+ch)
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op.SourceRect = &r
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op.GeoM.Reset()
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op.GeoM.Translate(float64(x), float64(y))
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op.GeoM.Translate(float64(ox+1), float64(oy))
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_ = rt.DrawImage(d.textImage, op)
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x += cw
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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) {
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if d.textImage == nil {
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img := assets.CreateTextImage()
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d.textImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterNearest)
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}
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d.drawText(r, str, 1, 1, color.NRGBA{0x00, 0x00, 0x00, 0x80})
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d.drawText(r, str, 0, 0, color.NRGBA{0xff, 0xff, 0xff, 0xff})
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}
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