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ebitenutil: Improve DebugPrint speed by not using color matrices

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This commit is contained in:
Hajime Hoshi 2018-03-05 02:08:44 +09:00
parent 8d98f297f2
commit 64abc79dc2
2 changed files with 25 additions and 16 deletions
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39
ebitenutil/debugprint.go
View File

@ -16,17 +16,35 @@ package ebitenutil
import (
"image"
"image/color"
"github.com/hajimehoshi/ebiten"
"github.com/hajimehoshi/ebiten/ebitenutil/internal/assets"
)
var debugPrintTextImage *ebiten.Image
var (
debugPrintTextImage *ebiten.Image
debugPrintTextShadowImage *ebiten.Image
)
func init() {
img := assets.CreateTextImage()
debugPrintTextImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
// Using color matrices for shadow color is not efficient.
// Instead, use a different image, that shares the same texture in highly possibility.
s := img.Bounds().Size()
for j := 0; j < s.Y; j++ {
for i := 0; i < s.X; i++ {
idx := (img.Stride)*j + 4*i
if img.Pix[idx+3] != 0 {
img.Pix[idx] = 0
img.Pix[idx+1] = 0
img.Pix[idx+2] = 0
img.Pix[idx+3] = 0x80
}
}
}
debugPrintTextShadowImage, _ = ebiten.NewImageFromImage(img, ebiten.FilterDefault)
}
// DebugPrint draws the string str on the image.
@ -35,22 +53,13 @@ func init() {
//
// DebugPrint always returns nil as of 1.5.0-alpha.
func DebugPrint(image *ebiten.Image, str string) error {
drawDebugText(image, str, 1, 1, color.NRGBA{0x00, 0x00, 0x00, 0x80})
drawDebugText(image, str, 0, 0, color.NRGBA{0xff, 0xff, 0xff, 0xff})
drawDebugText(image, str, 1, 1, debugPrintTextShadowImage)
drawDebugText(image, str, 0, 0, debugPrintTextImage)
return nil
}
func drawDebugText(rt *ebiten.Image, str string, ox, oy int, c color.Color) {
func drawDebugText(rt *ebiten.Image, str string, ox, oy int, src *ebiten.Image) {
op := &ebiten.DrawImageOptions{}
ur, ug, ub, ua := c.RGBA()
if ua == 0 {
return
}
r := float64(ur) / float64(ua)
g := float64(ug) / float64(ua)
b := float64(ub) / float64(ua)
a := float64(ua) / 0xffff
op.ColorM.Scale(r, g, b, a)
x := 0
y := 0
w, _ := debugPrintTextImage.Size()
@ -72,7 +81,7 @@ func drawDebugText(rt *ebiten.Image, str string, ox, oy int, c color.Color) {
op.GeoM.Reset()
op.GeoM.Translate(float64(x), float64(y))
op.GeoM.Translate(float64(ox+1), float64(oy))
_ = rt.DrawImage(debugPrintTextImage, op)
_ = rt.DrawImage(src, op)
x += cw
}
}

2
ebitenutil/internal/assets/assets.go
View File

@ -34,7 +34,7 @@ const (
CharHeight = 16
)
func CreateTextImage() image.Image {
func CreateTextImage() *image.RGBA {
s, err := gzip.NewReader(bytes.NewReader(compressedTextRGBA))
if err != nil {
panic(fmt.Sprintf("assets: gzip.NewReader failed: %v", err))