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Added a flag to decoded block to check if it contains any transparent colors. Useful to establish a fast path in transparent rendering if it does not.

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This commit is contained in:
Sascha L. Teichmann 2014-10-25 11:20:51 +02:00
parent 1acfd26e80
commit eaa3949b10
2 changed files with 31 additions and 18 deletions
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6
common/block.go
View File

@ -48,6 +48,7 @@ type (
AirId int32
IgnoreId int32
AirOnly bool
Transparent bool
IndexMap map[int32]int32
}
)
@ -138,6 +139,7 @@ func NewDecodedBlock(data []byte, colors *Colors) (db *DecodedBlock, err error)
airId, ignoreId := int32(-1), int32(-1)
indexMap := make(map[int32]int32)
var airOnly bool
var transparent bool
if version >= 22 {
offset++
numMappings := int(binary.BigEndian.Uint16(data[offset:]))
@ -157,6 +159,9 @@ func NewDecodedBlock(data []byte, colors *Colors) (db *DecodedBlock, err error)
default:
if index, found := colors.NameIndex[name]; found {
indexMap[nodeId] = index
if colors.IsTransparent(index) {
transparent = true
}
} else {
log.Printf("Missing color entry for %s.", name)
}
@ -171,6 +176,7 @@ func NewDecodedBlock(data []byte, colors *Colors) (db *DecodedBlock, err error)
AirId: airId,
IgnoreId: ignoreId,
AirOnly: airOnly,
Transparent: transparent,
IndexMap: indexMap}
return

15
common/colors.go
View File

@ -16,7 +16,7 @@ import (
type Colors struct {
Colors []color.RGBA
NameIndex map[string]int32
Transparent int
NumTransparent int32
}
type namedColor struct {
@ -24,6 +24,10 @@ type namedColor struct {
color color.RGBA
}
func (colors *Colors) IsTransparent(index int32) bool {
return index < colors.NumTransparent
}
type sortByAlpha []namedColor
func (colors sortByAlpha) Less(i, j int) bool {
@ -70,14 +74,17 @@ func ParseColors(filename string) (colors *Colors, err error) {
cs := make([]color.RGBA, len(cols))
nameIndex := make(map[string]int32, len(cols))
transparent := 0
numTransparent := int32(0)
for i, nc := range cols {
if nc.color.A < 0xff {
transparent++
numTransparent++
}
cs[i] = nc.color
nameIndex[nc.name] = int32(i)
}
colors = &Colors{Colors: cs, NameIndex: nameIndex, Transparent: transparent}
colors = &Colors{
Colors: cs,
NameIndex: nameIndex,
NumTransparent: numTransparent}
return
}