Changed: Allow to extract interface elements with build_interface

--HG--
branch : develop

code/nel/tools/3d/build_interface/main.cpp

@@ -210,6 +210,7 @@ int main(int argc, char **argv)
 
 	args.setDescription("Build a huge interface texture from several small elements to optimize video memory usage.");
 	args.addArg("s", "subset", "existing_uv_txt_name", "Build a subset of an existing interface definition while preserving the existing texture ids, to support freeing up VRAM by switching to the subset without rebuilding the entire interface.");
+	args.addArg("x", "extract", "", "Extract all interface elements from <output_filename> to <input_path>.");
 	args.addAdditionalArg("output_filename", "PNG or TGA file to generate", true);
 	args.addAdditionalArg("input_path", "Path that containts interfaces elements", false);
 
@@ -225,6 +226,9 @@ int main(int argc, char **argv)
 		existingUVfilename = args.getArg("s").front();
 	}
 
+	// extract all interface elements
+	bool extractElements = args.haveArg("x");
+
 	std::vector<std::string> inputDirs = args.getAdditionalArg("input_path");
 
 	string fmtName = args.getAdditionalArg("output_filename").front();
@@ -232,6 +236,111 @@ int main(int argc, char **argv)
 	// append PNG extension if no one provided
 	if (fmtName.rfind('.') == string::npos) fmtName += ".png";
 
+	if (extractElements)
+	{
+		if (inputDirs.empty())
+		{
+			outString(toString("ERROR: No input directories specified"));
+			return -1;
+		}
+
+		// name of UV file
+		existingUVfilename = fmtName.substr(0, fmtName.rfind('.'));
+		existingUVfilename += ".txt";
+
+		// Load existing UV file
+		CIFile iFile;
+		string filename = CPath::lookup(existingUVfilename, false);
+
+		if (filename.empty() || !iFile.open(filename))
+		{
+			outString(toString("ERROR: Unable to open %s", existingUVfilename.c_str()));
+			return -1;
+		}
+
+		// Load existing bitmap file
+		CIFile bitmapFile;
+
+		if (!bitmapFile.open(fmtName))
+		{
+			outString(toString("ERROR: Unable to open %s", fmtName.c_str()));
+			return -1;
+		}
+
+		// load bitmap
+		CBitmap textureBitmap;
+		uint8 colors = textureBitmap.load(bitmapFile);
+
+		// file already loaded in memory, close it
+		bitmapFile.close();
+
+		if (colors != 32)
+		{
+			outString(toString("ERROR: %s is not a RGBA bitmap", existingUVfilename.c_str()));
+			return -1;
+		}
+
+		// make sure transparent pixels are black
+		textureBitmap.makeTransparentPixelsBlack();
+
+		float textureWidth = (float)textureBitmap.getWidth();
+		float textureHeight = (float)textureBitmap.getHeight();
+
+		char bufTmp[256], tgaName[256];
+		string sTGAname;
+		float uvMinU, uvMinV, uvMaxU, uvMaxV;
+		while (!iFile.eof())
+		{
+			iFile.getline(bufTmp, 256);
+
+			if (sscanf(bufTmp, "%s %f %f %f %f", tgaName, &uvMinU, &uvMinV, &uvMaxU, &uvMaxV) != 5)
+			{
+				nlwarning("Can't parse %s", bufTmp);
+				continue;
+			}
+
+			float xf = uvMinU * textureWidth;
+			float yf = uvMinV * textureHeight;
+			float widthf = (uvMaxU - uvMinU) * textureWidth;
+			float heightf = (uvMaxV - uvMinV) * textureHeight;
+
+			uint x = (uint)xf;
+			uint y = (uint)yf;
+			uint width = (uint)widthf;
+			uint height = (uint)heightf;
+
+			if ((float)x != xf || (float)y != yf || (float)width != widthf || (float)height != heightf)
+			{
+				nlwarning("Wrong round");
+			}
+
+			if (width && height)
+			{
+				// create bitmap
+				CBitmap bitmap;
+				bitmap.resize(width, height);
+				bitmap.blit(textureBitmap, x, y, width, height, 0, 0);
+
+				sTGAname = inputDirs.front() + "/" + tgaName;
+
+				if (writeFileDependingOnFilename(sTGAname, bitmap))
+				{
+					outString(toString("Writing file %s", sTGAname.c_str()));
+				}
+				else
+				{
+					outString(toString("Unable to writing file %s", sTGAname.c_str()));
+				}
+			}
+			else
+			{
+				outString(toString("Bitmap with wrong size"));
+			}
+		}
+
+		return 0;
+	}
+
 	vector<string> AllMapNames;
 	vector<string>::iterator it = inputDirs.begin(), itEnd = inputDirs.end();