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feat: replace Minecraft logo with LCRE logo at 80% scale

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Replace MenuTitle and MenuTitleSmall bitmaps in skinHDWin.swf and
skinWin.swf with the custom LCRE (Legacy Console Edition Revelations)
logo, scaled to 80% within the original bitmap canvas to avoid
occlusion by the load/join menu.

Add ReplaceLogo.java and ExtractFromArc.java tools for SWF bitmap
replacement and arc file extraction. Keep original arc as .bak.
This commit is contained in:
itsRevela 2026-03-29 19:00:50 -05:00
parent b8cfd62cdf
commit 4a8291f6cc
4 changed files with 166 additions and 0 deletions
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Minecraft.Client/Common/Media/MediaWindows64.arc
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Minecraft.Client/Common/Media/MediaWindows64.arc.bak Normal file
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tools/ExtractFromArc.java Normal file
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import java.io.*;
import java.nio.file.*;
public class ExtractFromArc {
public static void main(String[] args) throws Exception {
if (args.length < 3) {
System.out.println("Usage: ExtractFromArc <arc_file> <filename> <output_path>");
System.exit(1);
}
String arcPath = args[0];
String target = args[1];
String outPath = args[2];
DataInputStream dis = new DataInputStream(new FileInputStream(arcPath));
int numFiles = dis.readInt();
int foundOffset = -1, foundSize = -1;
for (int i = 0; i < numFiles; i++) {
String name = dis.readUTF();
int offset = dis.readInt();
int size = dis.readInt();
if (name.startsWith("*")) name = name.substring(1);
if (name.equals(target)) {
foundOffset = offset;
foundSize = size;
}
}
dis.close();
if (foundOffset == -1) {
System.err.println("File not found in archive: " + target);
System.exit(1);
}
RandomAccessFile raf = new RandomAccessFile(arcPath, "r");
raf.seek(foundOffset);
byte[] data = new byte[foundSize];
raf.readFully(data);
raf.close();
Files.write(Paths.get(outPath), data);
System.out.println("Extracted " + target + " (" + foundSize + " bytes) -> " + outPath);
}
}

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tools/ReplaceLogo.java Normal file
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import com.jpexs.decompiler.flash.SWF;
import com.jpexs.decompiler.flash.tags.*;
import com.jpexs.decompiler.flash.tags.base.*;
import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.awt.*;
import java.io.*;
import java.util.*;
/**
* Replaces MenuTitle and MenuTitleSmall bitmaps in a skin SWF
* with a custom logo image, then saves the modified SWF.
*
* Usage: ReplaceLogo <skin.swf> <logo.png> <output.swf> [scale]
*
* Optional scale parameter (0.0-1.0) shrinks the logo within the bitmap
* canvas, adding transparent padding. Default is 1.0 (fill canvas).
*
* Finds bitmaps by symbol name (MenuTitle, MenuTitleSmall) rather than
* hardcoded IDs, so it works with both skinHDWin.swf and skinWin.swf.
*/
public class ReplaceLogo {
public static void main(String[] args) throws Exception {
if (args.length < 3) {
System.out.println("Usage: ReplaceLogo <skin.swf> <logo.png> <output.swf>");
System.exit(1);
}
String swfPath = args[0];
String logoPath = args[1];
String outputPath = args[2];
double extraScale = (args.length >= 4) ? Double.parseDouble(args[3]) : 1.0;
System.out.println("Loading SWF: " + swfPath);
SWF swf = new SWF(new FileInputStream(swfPath), false);
System.out.println("Loading logo: " + logoPath);
BufferedImage logoOriginal = ImageIO.read(new File(logoPath));
System.out.println("Logo dimensions: " + logoOriginal.getWidth() + "x" + logoOriginal.getHeight());
System.out.println("Extra scale: " + extraScale);
// Build symbol name map from SymbolClass tags
Map<Integer, String> symbolNames = new HashMap<>();
for (Tag tag : swf.getTags()) {
if (tag instanceof SymbolClassTag) {
SymbolClassTag sym = (SymbolClassTag) tag;
for (int i = 0; i < sym.tags.size(); i++) {
symbolNames.put(sym.tags.get(i), sym.names.get(i));
}
}
}
// Find and replace MenuTitle / MenuTitleSmall bitmaps by symbol name
Set<String> targetNames = Set.of("MenuTitle", "MenuTitleSmall");
int replaced = 0;
for (Tag tag : swf.getTags()) {
if (tag instanceof DefineBitsLossless2Tag) {
DefineBitsLossless2Tag bmp = (DefineBitsLossless2Tag) tag;
String symName = symbolNames.getOrDefault(bmp.characterID, "");
if (targetNames.contains(symName)) {
int targetW = bmp.bitmapWidth;
int targetH = bmp.bitmapHeight;
System.out.println("Replacing " + symName + " (id=" + bmp.characterID + ", " + targetW + "x" + targetH + ")");
// Scale logo to fit within target dimensions, maintaining aspect ratio
// Then apply extra scale factor to shrink within the canvas
int fitW = (int) Math.round(targetW * extraScale);
int fitH = (int) Math.round(targetH * extraScale);
BufferedImage scaled = scaleToFit(logoOriginal, fitW, fitH);
// Create target-sized image with transparency, center the scaled logo
BufferedImage target = new BufferedImage(targetW, targetH, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = target.createGraphics();
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
int xOff = (targetW - scaled.getWidth()) / 2;
int yOff = (targetH - scaled.getHeight()) / 2;
g.drawImage(scaled, xOff, yOff, null);
g.dispose();
// Convert BufferedImage to PNG bytes for FFDec setImage()
ByteArrayOutputStream baos = new ByteArrayOutputStream();
ImageIO.write(target, "PNG", baos);
bmp.setImage(baos.toByteArray());
System.out.println(" Replaced with " + scaled.getWidth() + "x" + scaled.getHeight() + " (centered in " + targetW + "x" + targetH + ")");
replaced++;
}
}
}
if (replaced == 0) {
System.err.println("ERROR: No logo bitmaps found to replace!");
System.exit(1);
}
System.out.println("Saving modified SWF: " + outputPath);
try (FileOutputStream fos = new FileOutputStream(outputPath)) {
swf.saveTo(fos);
}
System.out.println("Done! Replaced " + replaced + " bitmaps.");
}
static BufferedImage scaleToFit(BufferedImage src, int maxW, int maxH) {
double scaleX = (double) maxW / src.getWidth();
double scaleY = (double) maxH / src.getHeight();
double scale = Math.min(scaleX, scaleY);
int newW = (int) Math.round(src.getWidth() * scale);
int newH = (int) Math.round(src.getHeight() * scale);
BufferedImage result = new BufferedImage(newW, newH, BufferedImage.TYPE_INT_ARGB);
Graphics2D g = result.createGraphics();
g.setRenderingHint(RenderingHints.KEY_INTERPOLATION, RenderingHints.VALUE_INTERPOLATION_BICUBIC);
g.setRenderingHint(RenderingHints.KEY_ANTIALIASING, RenderingHints.VALUE_ANTIALIAS_ON);
g.drawImage(src, 0, 0, newW, newH, null);
g.dispose();
return result;
}
}