llimagedxt.h
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- /**
- * @file llimagedxt.h
- *
- * $LicenseInfo:firstyear=2001&license=viewergpl$
- *
- * Copyright (c) 2001-2010, Linden Research, Inc.
- *
- * Second Life Viewer Source Code
- * The source code in this file ("Source Code") is provided by Linden Lab
- * to you under the terms of the GNU General Public License, version 2.0
- * ("GPL"), unless you have obtained a separate licensing agreement
- * ("Other License"), formally executed by you and Linden Lab. Terms of
- * the GPL can be found in doc/GPL-license.txt in this distribution, or
- * online at http://secondlifegrid.net/programs/open_source/licensing/gplv2
- *
- * There are special exceptions to the terms and conditions of the GPL as
- * it is applied to this Source Code. View the full text of the exception
- * in the file doc/FLOSS-exception.txt in this software distribution, or
- * online at
- * http://secondlifegrid.net/programs/open_source/licensing/flossexception
- *
- * By copying, modifying or distributing this software, you acknowledge
- * that you have read and understood your obligations described above,
- * and agree to abide by those obligations.
- *
- * ALL LINDEN LAB SOURCE CODE IS PROVIDED "AS IS." LINDEN LAB MAKES NO
- * WARRANTIES, EXPRESS, IMPLIED OR OTHERWISE, REGARDING ITS ACCURACY,
- * COMPLETENESS OR PERFORMANCE.
- * $/LicenseInfo$
- */
- #ifndef LL_LLIMAGEDXT_H
- #define LL_LLIMAGEDXT_H
- #include "llimage.h"
- #include "llpointer.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();
- private:
- BOOL encodeDXT(const LLImageRaw* raw_image, F32 decode_time, bool explicit_mips);
-
- public:
- LLImageDXT();
- /*virtual*/ std::string getExtension() { return std::string("dxt"); }
- /*virtual*/ BOOL updateData();
- /*virtual*/ BOOL decode(LLImageRaw* raw_image, F32 decode_time);
- /*virtual*/ BOOL encode(const LLImageRaw* raw_image, F32 encode_time);
- /*virtual*/ S32 calcHeaderSize();
- /*virtual*/ S32 calcDataSize(S32 discard_level = 0);
- BOOL getMipData(LLPointer<LLImageRaw>& raw, S32 discard=-1);
-
- 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