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internal/atlas: bug fix: wrong logic to create a new mask with edges

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* Fixed wrong operator orders
 * Cleared an allocated region explicitlly

Closes #2089
This commit is contained in:
Hajime Hoshi 2022-05-08 23:05:05 +09:00
parent 9cfa84ddaa
commit faf1e7350d
1 changed files with 8 additions and 4 deletions
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12
internal/atlas/image.go
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@ -570,21 +570,25 @@ func (i *Image) replacePixels(pix []byte, mask []byte) {
if mask != nil {
origMask := mask
mask = theTemporaryBytes.alloc((pw*ph-1)/8 + 1)
// Clear the allocated region explicitly (#2089).
for i := range mask {
mask[i] = 0
}
for i := 0; i < pw; i++ {
// Top edge
idx := i
mask[idx/8] |= 1 << idx % 8
mask[idx/8] |= 1 << (idx % 8)
// Bottom edge
idx = (ph-1)*pw + i
mask[idx/8] |= 1 << idx % 8
mask[idx/8] |= 1 << (idx % 8)
}
for j := 1; j < ph-1; j++ {
// Left edge
idx := j * pw
mask[idx/8] |= 1 << idx % 8
mask[idx/8] |= 1 << (idx % 8)
// Right edge
idx = j*pw + pw - 1
mask[idx/8] |= 1 << idx % 8
mask[idx/8] |= 1 << (idx % 8)
// Content
for i := 1; i < pw-1; i++ {