/** * @file llimagedxt.h * * $LicenseInfo:firstyear=2001&license=viewerlgpl$ * Second Life Viewer Source Code * Copyright (C) 2010, Linden Research, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; * version 2.1 of the License only. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA * * Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA * $/LicenseInfo$ */ #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