kistaro/apgbpal
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parsing

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This commit is contained in:
Kistaro Windrider 2023-12-09 20:50:15 -08:00
parent 44ac333501
commit e3443d57f5
Signed by: kistaro
SSH Key Fingerprint: SHA256:TBE2ynfmJqsAf0CP6gsflA0q5X5wD5fVKWPsZ7eVUg8
1 changed files with 87 additions and 3 deletions
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88
apgbpal.go
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@ -1,5 +1,11 @@
package main
import (
"fmt"
"strings"
"log"
)
type RGBA struct {
R byte
G byte
@ -11,6 +17,45 @@ func (c RGBA) Bytes() [4]byte {
return [4]byte {c.R, c.G, cB, c.A}
}
func HexByteAt(str string, index int) (byte, error) {
if len(string) < index + 2 {
return 0, fmt.Errorf("no hex byte at %d in too short string %q", index, str)
}
big, err := strconv.ParseUint(str[index:index+1], 16, 8)
if err != nil {
return 0, fmt.Errorf("can't parse hex byte at %d in string %q: %w", index, str, err)
}
return byte(big), nil
}
func MustParseRGBA(str string) RGBA {
s := strings.TrimSpace(str)
s = strings.ToLower(s)
s, _ = strings.CutPrefix(s, "#")
var ret RGBA
switch len(s) {
case 6:
ret.A = 0xFF
case 8:
var err error
ret.A, err = HexByteAt(s, 6)
if err != nil {
log.Fatalf("can't parse alpha channel: %v", err)
}
default:
log.Fatalf("%q is not an RGBA value: wrong length after trimming", str)
}
if ret.R, err := HexByteAt(s, 0); err != nil {
log.Fatalf("can't parse red channel: %v", err)
}
if ret.G, err := HexByteAt(s, 2); err != nil {
log.Fatalf("can't parse green channel: %v", err)
}
if ret.B, err := HexByteAt(s, 4); err != nil {
log.Fatalf("can't parse blue channel: %v", err)
}
}
type BGPal [4]RGBA
func (b BGPal) Bytes() [20]byte {
@ -28,6 +73,20 @@ func (b BGPal) Bytes() [20]byte {
return ret
}
func MustParseBGPal(strs []string) BGPal {
if len(strs) != 4 {
log.Fatalf("MustParseBGPal requires length 4, got %d", len(strs))
}
var ret BGPal
for i := 0; i < 4; i++ {
ret[i], err := MustParseRGBA(strs[i])
if err != nil {
log.Fatalf("MustParseBGPal can't parse at %d: %v", i, err)
}
}
return ret
}
type OBJPal [3]RGBA
func (o OBJPal) Bytes(indexchar byte) [18]byte {
@ -47,12 +106,37 @@ func (o OBJPal) Bytes(indexchar byte) [18]byte {
return ret
}
func MustParseOBJPal {
if len(strs) != 3 {
log.Fatalf("MustParseObjPal requires length 3, got %d", len(strs))
}
var ret OBJPal
for i := 0; i < 3; i++ {
ret[i], err := MustParseRGBA(strs[i])
if err != nil {
log.Fatalf("MustParseOBJPal can't parse at %d: %v", i, err)
}
}
return ret
}
type APGBPal struct {
BG BGPal
OBJ0 OBJPal
OBJ1 OBJPal
OBJ2 OBJPal
}
func (a APGBPal) Bytes() [56]byte {
var ret [56]byte
for i, b := range a.BG.Bytes() {
ret[i] = b
}
for i, b := range a.OBJ0.Bytes('0') {
ret[i+20] = b
}
for i, b := range a.OBJ1.Bytes('1') {
ret[i+38] = b
}
return ret
}