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graphics: Avoid using subslicing

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This commit is contained in:
Hajime Hoshi 2016-10-25 02:05:45 +09:00
parent ebf7f0df00
commit 69e83fa759
1 changed files with 6 additions and 2 deletions
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8
imageparts.go
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@ -124,12 +124,16 @@ func vertices(parts ImageParts, width, height int, geo *GeoM) []uint8 {
for j := 0; j < 4; j++ {
offset := totalSize*n + oneSize*j
if endian.IsLittle() {
for k, v := range vs[4*j : 4*j+4] {
// Subslicing like vs[4*j:4*j+4] is slow on browsers.
// Don't do this.
for k := 0; k < 4; k++ {
v := vs[4*j+k]
vertices[offset+2*k] = uint8(v)
vertices[offset+2*k+1] = uint8(v >> 8)
}
} else {
for k, v := range vs[4*j : 4*j+4] {
for k := 0; k < 4; k++ {
v := vs[4*j+k]
vertices[offset+2*k] = uint8(v >> 8)
vertices[offset+2*k+1] = uint8(v)
}