142 lines
4.0 KiB
C++
142 lines
4.0 KiB
C++
/**
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* @file llimagedxt.h
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*
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* $LicenseInfo:firstyear=2001&license=viewerlgpl$
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* Second Life Viewer Source Code
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* Copyright (C) 2010, Linden Research, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation;
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* version 2.1 of the License only.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*
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* Linden Research, Inc., 945 Battery Street, San Francisco, CA 94111 USA
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* $/LicenseInfo$
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*/
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#ifndef LL_LLIMAGEDXT_H
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#define LL_LLIMAGEDXT_H
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#include "llimage.h"
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#include "llpointer.h"
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// This class decodes and encodes LL DXT files (which may unclude uncompressed RGB or RGBA mipped data)
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class LLImageDXT : public LLImageFormatted
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{
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public:
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enum EFileFormat
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{
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FORMAT_UNKNOWN = 0,
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FORMAT_I8 = 1,
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FORMAT_A8,
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FORMAT_RGB8,
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FORMAT_RGBA8,
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FORMAT_DXT1,
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FORMAT_DXT2,
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FORMAT_DXT3,
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FORMAT_DXT4,
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FORMAT_DXT5,
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FORMAT_DXR1,
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FORMAT_DXR2,
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FORMAT_DXR3,
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FORMAT_DXR4,
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FORMAT_DXR5,
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FORMAT_NOFILE = 0xff,
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};
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struct dxtfile_header_old_t
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{
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S32 format;
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S32 maxlevel;
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S32 maxwidth;
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S32 maxheight;
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};
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struct dxtfile_header_t
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{
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S32 fourcc;
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// begin DDSURFACEDESC2 struct
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S32 header_size; // size of the header
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S32 flags; // flags - unused
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S32 maxheight;
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S32 maxwidth;
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S32 image_size; // size of the compressed image
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S32 depth;
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S32 num_mips;
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S32 reserved[11];
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struct pixel_format
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{
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S32 struct_size; // size of this structure
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S32 flags;
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S32 fourcc;
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S32 bit_count;
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S32 r_mask;
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S32 g_mask;
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S32 b_mask;
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S32 a_mask;
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} pixel_fmt;
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S32 caps[4];
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S32 reserved2;
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};
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protected:
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/*virtual*/ ~LLImageDXT();
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private:
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bool encodeDXT(const LLImageRaw* raw_image, F32 decode_time, bool explicit_mips);
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public:
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LLImageDXT();
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/*virtual*/ std::string getExtension() { return std::string("dxt"); }
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/*virtual*/ bool updateData();
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/*virtual*/ bool decode(LLImageRaw* raw_image, F32 decode_time);
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/*virtual*/ bool encode(const LLImageRaw* raw_image, F32 encode_time);
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/*virtual*/ S32 calcHeaderSize();
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/*virtual*/ S32 calcDataSize(S32 discard_level = 0);
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bool getMipData(LLPointer<LLImageRaw>& raw, S32 discard=-1);
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void setFormat();
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S32 getMipOffset(S32 discard);
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EFileFormat getFileFormat() { return mFileFormat; }
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bool isCompressed() { return (mFileFormat >= FORMAT_DXT1 && mFileFormat <= FORMAT_DXR5); }
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bool convertToDXR(); // convert from DXT to DXR
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static void checkMinWidthHeight(EFileFormat format, S32& width, S32& height);
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static S32 formatBits(EFileFormat format);
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static S32 formatBytes(EFileFormat format, S32 width, S32 height);
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static S32 formatOffset(EFileFormat format, S32 width, S32 height, S32 max_width, S32 max_height);
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static S32 formatComponents(EFileFormat format);
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static EFileFormat getFormat(S32 fourcc);
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static S32 getFourCC(EFileFormat format);
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static void calcDiscardWidthHeight(S32 discard_level, EFileFormat format, S32& width, S32& height);
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static S32 calcNumMips(S32 width, S32 height);
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private:
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static void extractMip(const U8 *indata, U8* mipdata, int width, int height,
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int mip_width, int mip_height, EFileFormat format);
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private:
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EFileFormat mFileFormat;
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S32 mHeaderSize;
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};
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#endif
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