mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-12-26 19:58:54 +01:00
92 lines
2.4 KiB
Go
92 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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"github.com/hajimehoshi/ebiten"
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"github.com/hajimehoshi/ebiten/ebitenutil/internal/assets"
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)
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var (
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debugPrintTextImage *ebiten.Image
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debugPrintTextShadowImage *ebiten.Image
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)
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func init() {
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img := assets.CreateTextImage()
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debugPrintTextImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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// Using color matrices for shadow color is not efficient.
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// Instead, use a different image, that shares the same texture in highly possibility.
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s := img.Bounds().Size()
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for j := 0; j < s.Y; j++ {
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for i := 0; i < s.X; i++ {
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idx := (img.Stride)*j + 4*i
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if img.Pix[idx+3] != 0 {
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img.Pix[idx] = 0
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img.Pix[idx+1] = 0
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img.Pix[idx+2] = 0
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img.Pix[idx+3] = 0x80
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}
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}
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}
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debugPrintTextShadowImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
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}
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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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drawDebugText(image, str, 1, 1, debugPrintTextShadowImage)
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drawDebugText(image, str, 0, 0, debugPrintTextImage)
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return nil
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}
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func drawDebugText(rt *ebiten.Image, str string, ox, oy int, src *ebiten.Image) {
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op := &ebiten.DrawImageOptions{}
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x := 0
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y := 0
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w, _ := debugPrintTextImage.Size()
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var r image.Rectangle
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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.Min.X = sx
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r.Min.Y = sy
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r.Max.X = sx + cw
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r.Max.Y = 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(src, op)
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x += cw
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}
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}
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