mirror of
https://github.com/hajimehoshi/ebiten.git
synced 2024-09-20 05:12:18 +02:00
118 lines
3.0 KiB
Go
118 lines
3.0 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/ebitenutil/internal/assets"
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"image/color"
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"math"
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"strings"
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)
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type debugPrintImageParts string
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func (f debugPrintImageParts) Len() int {
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return len(f)
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}
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func (f debugPrintImageParts) Dst(i int) (x0, y0, x1, y1 int) {
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cw, ch := assets.TextImageCharWidth, assets.TextImageCharHeight
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x := i - strings.LastIndex(string(f)[:i], "\n") - 1
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y := strings.Count(string(f)[:i], "\n")
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x *= cw
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y *= ch
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if x < 0 {
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return 0, 0, 0, 0
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}
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return x, y, x + cw, y + ch
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}
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func (f debugPrintImageParts) Src(i int) (x0, y0, x1, y1 int) {
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cw, ch := assets.TextImageCharWidth, assets.TextImageCharHeight
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const n = assets.TextImageWidth / assets.TextImageCharWidth
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code := int(f[i])
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if code == '\n' {
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return 0, 0, 0, 0
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}
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x := (code % n) * cw
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y := (code / n) * ch
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return x, y, x + cw, y + ch
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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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}
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var defaultDebugPrintState = &debugPrintState{}
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// DebugPrint draws the string str on the image.
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func DebugPrint(image *ebiten.Image, str string) error {
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return defaultDebugPrintState.DebugPrint(image, str)
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}
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func (d *debugPrintState) drawText(rt *ebiten.Image, str string, x, y int, c color.Color) error {
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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 := &ebiten.DrawImageOptions{
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ImageParts: debugPrintImageParts(str),
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}
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op.GeoM.Translate(float64(x+1), float64(y))
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op.ColorM.Scale(r, g, b, a)
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if err := rt.DrawImage(d.textImage, op); err != nil {
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return err
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}
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return nil
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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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if err := d.drawText(r, str, 1, 1, color.NRGBA{0x00, 0x00, 0x00, 0x80}); err != nil {
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return err
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}
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if err := d.drawText(r, str, 0, 0, color.NRGBA{0xff, 0xff, 0xff, 0xff}); err != nil {
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return err
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}
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return nil
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}
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