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When generating shaded tiles draw to pix buffer directly instead of calling Set() for each pixel. Set resize filter for generating pyramid tiles to Lanczos3 because of better visual results.

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This commit is contained in:
Sascha L. Teichmann 2014-09-16 00:08:31 +02:00
parent 0850b69028
commit 90bfc225b8
2 changed files with 17 additions and 7 deletions
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2
cmd/mtseeder/pyramid.go
View File

@ -169,7 +169,7 @@ func fuseTile(scratch *image.RGBA, job *pyramidJob) (err error) {
draw.Draw(scratch, r, img, sr.Min, draw.Src)
}
resized := resize.Resize(256, 256, scratch, resize.Bicubic)
resized := resize.Resize(256, 256, scratch, resize.Lanczos3)
var outFile *os.File
if outFile, err = os.Create(job.dst); err != nil {

22
common/renderer.go
View File

@ -346,11 +346,20 @@ func (r *Renderer) CreateShadedImage(
stride := pw - width
istride := image.Stride + 4*width
iofs := image.PixOffset(0, height-1)
pix := image.Pix
for z := height - 1; z >= 0; z-- {
for x := 0; x < width; x++ {
colIdx := r.cBuffer[ofs]
if colIdx < 0 || colIdx >= numCols {
image.Set(x, z, background)
pix[iofs] = background.R
pix[iofs+1] = background.G
pix[iofs+2] = background.B
pix[iofs+3] = 0xff
} else {
var y, y1, y2 int32
y = r.yBuffer[ofs]
@ -369,15 +378,16 @@ func (r *Renderer) CreateShadedImage(
d = 36
}
col := colors[colIdx]
image.Set(x, z, color.RGBA{
R: safeColor(int32(col.R) + d),
G: safeColor(int32(col.G) + d),
B: safeColor(int32(col.B) + d),
A: 0xff})
pix[iofs] = safeColor(int32(col.R) + d)
pix[iofs+1] = safeColor(int32(col.G) + d)
pix[iofs+2] = safeColor(int32(col.B) + d)
pix[iofs+3] = 0xff
}
iofs += 4
ofs++
}
ofs += stride
iofs -= istride
}
return image
}