1 files changed, 120 insertions, 0 deletions
diff --git a/indra/llimage/llimagedxt.h b/indra/llimage/llimagedxt.h
new file mode 100644
index 0000000000..88d28a2958
--- /dev/null
+++ b/indra/llimage/llimagedxt.h
@@ -0,0 +1,120 @@
+/** 
+ * @file llimagedxt.h
+ *
+ * Copyright (c) 2001-$CurrentYear$, Linden Research, Inc.
+ * $License$
+ */
+
+#ifndef LL_LLIMAGEDXT_H
+#define LL_LLIMAGEDXT_H
+
+#include "llimage.h"
+
+// This class decodes and encodes LL DXT files (which may unclude uncompressed RGB or RGBA mipped data)
+
+class LLImageDXT : public LLImageFormatted
+{
+public:
+	enum EFileFormat
+	{ 
+		FORMAT_UNKNOWN = 0,
+		FORMAT_I8 = 1,
+		FORMAT_A8,
+		FORMAT_RGB8,
+		FORMAT_RGBA8,
+		FORMAT_DXT1,
+		FORMAT_DXT2,
+		FORMAT_DXT3,
+		FORMAT_DXT4,
+		FORMAT_DXT5,
+		FORMAT_DXR1,
+		FORMAT_DXR2,
+		FORMAT_DXR3,
+		FORMAT_DXR4,
+		FORMAT_DXR5,
+		FORMAT_NOFILE = 0xff,
+	};
+	
+	struct dxtfile_header_old_t
+	{
+		S32 format;
+		S32 maxlevel;
+		S32 maxwidth;
+		S32 maxheight;
+	};
+
+	struct dxtfile_header_t
+	{
+		S32 fourcc;
+		// begin DDSURFACEDESC2 struct
+		S32 header_size; // size of the header
+		S32 flags; // flags - unused
+		S32 maxheight;
+		S32 maxwidth;
+		S32 image_size; // size of the compressed image
+		S32 depth;
+		S32 num_mips;
+		S32 reserved[11];
+		struct pixel_format
+		{
+			S32 struct_size; // size of this structure
+			S32 flags;
+			S32 fourcc;
+			S32 bit_count;
+			S32 r_mask;
+			S32 g_mask;
+			S32 b_mask;
+			S32 a_mask;
+		} pixel_fmt;
+		S32 caps[4];
+		S32 reserved2;
+	};
+
+protected:
+	/*virtual*/ ~LLImageDXT();
+	
+public:
+	LLImageDXT();
+
+	/*virtual*/ BOOL updateData();
+
+	/*virtual*/ BOOL decode(LLImageRaw* raw_image, F32 time=0.0);
+				BOOL encode(const LLImageRaw* raw_image, F32 time, bool explicit_mips);
+	/*virtual*/ BOOL encode(const LLImageRaw* raw_image, F32 time=0.0);
+
+	/*virtual*/ BOOL requestDecodedData(LLPointer<LLImageRaw>& raw, S32 discard=-1, F32 decode_time=0.0);
+	/*virtual*/ void releaseDecodedData();
+	
+	/*virtual*/ S32 calcHeaderSize();
+	/*virtual*/ S32 calcDataSize(S32 discard_level = 0);
+
+	void setFormat();
+	S32 getMipOffset(S32 discard);
+	
+	EFileFormat getFileFormat() { return mFileFormat; }
+	bool isCompressed() { return (mFileFormat >= FORMAT_DXT1 && mFileFormat <= FORMAT_DXR5); }
+
+	bool convertToDXR(); // convert from DXT to DXR
+	
+	static void checkMinWidthHeight(EFileFormat format, S32& width, S32& height);
+	static S32 formatBits(EFileFormat format);
+	static S32 formatBytes(EFileFormat format, S32 width, S32 height);
+	static S32 formatOffset(EFileFormat format, S32 width, S32 height, S32 max_width, S32 max_height);
+	static S32 formatComponents(EFileFormat format);
+	
+	static EFileFormat getFormat(S32 fourcc);
+	static S32 getFourCC(EFileFormat format);
+
+	static void calcDiscardWidthHeight(S32 discard_level, EFileFormat format, S32& width, S32& height);
+	static S32 calcNumMips(S32 width, S32 height);
+
+private:
+	static void extractMip(const U8 *indata, U8* mipdata, int width, int height,
+						   int mip_width, int mip_height, EFileFormat format);
+	
+private:
+	EFileFormat mFileFormat;
+	S32 mHeaderSize;
+};
+
+#endif