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https://bitbucket.org/s_l_teichmann/mtsatellite
synced 2024-11-10 12:10:23 +01:00
Sort transparent colors from colors.txt to front of lookup table. Makes it easier
to determine if a color index corresponds to a transparent color.
This commit is contained in:
parent
e4baf66fb9
commit
1c530a2ce7
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@ -9,12 +9,33 @@ import (
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"fmt"
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"image/color"
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"os"
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"sort"
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"strings"
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)
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type Colors struct {
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Colors []color.RGBA
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NameIndex map[string]int32
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Colors []color.RGBA
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NameIndex map[string]int32
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Transparent int
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}
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type namedColor struct {
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name string
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color color.RGBA
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}
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type sortByAlpha []namedColor
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func (colors sortByAlpha) Less(i, j int) bool {
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return colors[i].color.A < colors[j].color.A
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}
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func (colors sortByAlpha) Len() int {
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return len(colors)
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}
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func (colors sortByAlpha) Swap(i, j int) {
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colors[i], colors[j] = colors[j], colors[i]
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}
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func ParseColors(filename string) (colors *Colors, err error) {
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@ -25,8 +46,7 @@ func ParseColors(filename string) (colors *Colors, err error) {
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}
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defer file.Close()
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nameIndex := make(map[string]int32)
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cols := make([]color.RGBA, 0, 2200)
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cols := make([]namedColor, 0, 2200)
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scanner := bufio.NewScanner(file)
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for scanner.Scan() {
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@ -38,12 +58,26 @@ func ParseColors(filename string) (colors *Colors, err error) {
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var name string
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if n, _ := fmt.Sscanf(
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line, "%s %d %d %d %d", &name, &c.R, &c.G, &c.B, &c.A); n > 0 {
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idx := int32(len(cols))
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cols = append(cols, c)
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nameIndex[name] = idx
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cols = append(cols, namedColor{name: name, color: c})
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}
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}
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err = scanner.Err()
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colors = &Colors{Colors: cols, NameIndex: nameIndex}
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// Sort transparent colors to front. Makes it easier to figure out
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// if an index corresponds to a transparent color (i < Transparent).
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sort.Sort(sortByAlpha(cols))
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cs := make([]color.RGBA, len(cols))
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nameIndex := make(map[string]int32, len(cols))
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transparent := 0
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for i, nc := range cols {
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if nc.color.A < 0xff {
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transparent++
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}
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cs[i] = nc.color
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nameIndex[nc.name] = int32(i)
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}
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colors = &Colors{Colors: cs, NameIndex: nameIndex, Transparent: transparent}
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return
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}
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