finish dc6 extractor, simplify decoder and palette code

formats/dat/dat.go

@@ -2,20 +2,30 @@ package dat
 
 import (
 	"encoding/binary"
+	imageColor "image/color"
 	"io"
-
-	"github.com/FooSoft/lazarus/math"
 )
 
 type Palette struct {
-	Colors [256]math.Color3b
+	Colors [256]imageColor.NRGBA
 }
 
-func NewFromReader(r io.Reader) (*Palette, error) {
+type color struct {
-	p := new(Palette)
+	B byte
-	if err := binary.Read(r, binary.LittleEndian, p); err != nil {
+	G byte
+	R byte
+}
+
+func NewFromReader(reader io.Reader) (*Palette, error) {
+	var colors [256]color
+	if err := binary.Read(reader, binary.LittleEndian, &colors); err != nil {
 		return nil, err
 	}
 
-	return p, nil
+	palette := new(Palette)
+	for i, color := range colors {
+		palette.Colors[i] = imageColor.NRGBA{color.R, color.G, color.B, 0xff}
+	}
+
+	return palette, nil
 }

formats/dc6/dc6.go

@@ -9,9 +9,9 @@ import (
 
 type fileHeader struct {
 	Version      uint32
-	UnusedFlags     uint32
+	_            uint32 // unused: flags
-	UnusedFormat    uint32
+	_            uint32 // unused: format
-	UnusedSkipColor uint32
+	_            uint32 // unused: skipColor
 	DirCount     uint32
 	FramesPerDir uint32
 }
@@ -22,8 +22,8 @@ type frameHeader struct {
 	Height  uint32
 	OffsetX uint32
 	OffsetY uint32
-	UnusedAllocSize uint32
+	_       uint32 // unused: allocSize
-	UnusedNextBlock uint32
+	_       uint32 // unused: nextBlock
 	Length  uint32
 }
 
@@ -51,10 +51,8 @@ func NewFromReader(reader io.ReadSeeker) (*Sprite, error) {
 		return nil, err
 	}
 
-	frameCount := int(fileHead.DirCount * fileHead.FramesPerDir)
-
 	var frameOffsets []uint32
-	for i := 0; i < frameCount; i++ {
+	for i := uint32(0); i < fileHead.DirCount*fileHead.FramesPerDir; i++ {
 		var frameOffset uint32
 		if err := binary.Read(reader, binary.LittleEndian, &frameOffset); err != nil {
 			return nil, err
@@ -65,9 +63,9 @@ func NewFromReader(reader io.ReadSeeker) (*Sprite, error) {
 
 	sprite.Directions = make([]Direction, fileHead.FramesPerDir)
 
-	for i := 0; i < frameCount; i++ {
+	for i, frameOffset := range frameOffsets {
 		var frameHead frameHeader
-		if _, err := reader.Seek(int64(frameOffsets[i]), io.SeekStart); err != nil {
+		if _, err := reader.Seek(int64(frameOffset), io.SeekStart); err != nil {
 			return nil, err
 		}
 
@@ -97,33 +95,36 @@ func NewFromReader(reader io.ReadSeeker) (*Sprite, error) {
 }
 
 func extractFrame(reader io.ReadSeeker, writer io.WriteSeeker, header frameHeader) error {
-	var (
+	var x, y uint32
-		x uint32
+	for readOffset := uint32(0); readOffset < header.Length; readOffset++ {
-		y = header.Height - 1
+		var chunk byte
-	)
+		if err := binary.Read(reader, binary.LittleEndian, &chunk); err != nil {
-
-	var offset uint32
-	for offset < header.Length {
-		var chunkSize byte
-		if err := binary.Read(reader, binary.LittleEndian, &chunkSize); err != nil {
 			return err
 		}
 
-		if chunkSize == 0x80 {
+		if chunk&0x80 > 0 {
-			x = 0
+			if skipLength := uint32(chunk & 0x7f); skipLength > 0 {
-			y--
+				x += skipLength
-		} else if (chunkSize & 0x80) != 0 {
-			x += uint32(chunkSize & 0x7f)
 			} else {
-			if _, err := writer.Seek(int64(header.Width*y+x), io.SeekStart); err != nil {
+				x = 0
+				y++
+			}
+
+		} else {
+			writeOffset := int64(header.Width*(header.Height-y-1) + x)
+			if header.Flip != 0 {
+				writeOffset = int64(header.Width*y + x)
+			}
+
+			if _, err := writer.Seek(writeOffset, io.SeekStart); err != nil {
 				return err
 			}
-			if _, err := io.CopyN(writer, reader, int64(chunkSize)); err != nil {
+			if _, err := io.CopyN(writer, reader, int64(chunk)); err != nil {
 				return err
 			}
 
-			offset += uint32(chunkSize)
+			readOffset += uint32(chunk)
-			x += uint32(chunkSize)
+			x += uint32(chunk)
 		}
 	}
 

math/color.go

@@ -1,5 +0,0 @@
-package math
-
-type Color3b struct {
-	R, G, B byte
-}

streaming/bytewriter.go

@@ -52,5 +52,6 @@ func (w *writer) Seek(offset int64, whence int) (int64, error) {
 		return int64(w.offset), errors.New("cannot seek past end of buffer")
 	}
 
+	w.offset = result
 	return int64(w.offset), nil
 }

tools/dc6/dc6.go

@@ -3,8 +3,11 @@ package main
 import (
 	"flag"
 	"fmt"
+	"image"
+	"image/png"
 	"os"
 	"path"
+	"path/filepath"
 
 	"github.com/FooSoft/lazarus/formats/dat"
 	"github.com/FooSoft/lazarus/formats/dc6"
@@ -28,40 +31,64 @@ func loadSprite(path string) (*dc6.Sprite, error) {
 	return dc6.NewFromReader(fp)
 }
 
-func extractSprite(palettePath, spritePath, targetDir string) error {
+func extractSprite(spritePath string, palette *dat.Palette, targetDir string) error {
-	_, err := loadPalette(palettePath)
+	sprite, err := loadSprite(spritePath)
 	if err != nil {
 		return err
 	}
 
-	_, err = loadSprite(spritePath)
+	for di, direction := range sprite.Directions {
+		for fi, frame := range direction.Frames {
+			img := image.NewNRGBA(image.Rect(0, 0, frame.Width, frame.Height))
+			for y := 0; y < frame.Height; y++ {
+				for x := 0; x < frame.Width; x++ {
+					img.Set(x, y, palette.Colors[frame.Data[y*frame.Width+x]])
+				}
+			}
+
+			basePath := filepath.Base(spritePath)
+			targetPath := fmt.Sprintf("%s_%d_%d.png", filepath.Join(targetDir, basePath), di, fi)
+
+			fp, err := os.Create(targetPath)
 			if err != nil {
 				return err
 			}
+			defer fp.Close()
+
+			if err := png.Encode(fp, img); err != nil {
+				return err
+			}
+		}
+	}
 
 	return nil
 }
 
 func main() {
-	var (
+	targetDir := flag.String("target", ".", "target directory")
-		targetDir = flag.String("target", ".", "target directory")
-	)
-
 	flag.Usage = func() {
-		fmt.Fprintf(os.Stderr, "Usage: %s [options] palette_file dc6_file\n", path.Base(os.Args[0]))
+		fmt.Fprintf(os.Stderr, "Usage: %s [options] palette_file [dc6_files]\n", path.Base(os.Args[0]))
 		fmt.Fprintf(os.Stderr, "Parameters:\n\n")
 		flag.PrintDefaults()
 	}
 
 	flag.Parse()
 
-	if flag.NArg() < 2 {
+	if flag.NArg() < 1 {
 		flag.Usage()
 		os.Exit(2)
 	}
 
-	if err := extractSprite(flag.Arg(0), flag.Arg(1), *targetDir); err != nil {
+	palette, err := loadPalette(flag.Arg(0))
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	for i := 1; i < flag.NArg(); i++ {
+		if err := extractSprite(flag.Arg(1), palette, *targetDir); err != nil {
 			fmt.Fprintln(os.Stderr, err)
 			os.Exit(1)
 		}
 	}
+}