110 lines
2.4 KiB
C
110 lines
2.4 KiB
C
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//========= Copyright Valve Corporation, All rights reserved. ============//
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//
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// Purpose:
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//
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//=============================================================================//
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#ifndef S3TC_DECODE_H
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#define S3TC_DECODE_H
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#ifdef _WIN32
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#pragma once
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#endif
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#include "bitmap/imageformat.h"
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enum ImageFormat;
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class S3RGBA
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{
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public:
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unsigned char b, g, r, a;
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};
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class S3PaletteIndex
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{
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public:
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unsigned char m_AlphaIndex;
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unsigned char m_ColorIndex;
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};
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#define MAX_S3TC_BLOCK_BYTES 16
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S3PaletteIndex S3TC_GetPixelPaletteIndex( ImageFormat format, const char *pS3Block, int x, int y );
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void S3TC_SetPixelPaletteIndex( ImageFormat format, char *pS3Block, int x, int y, S3PaletteIndex iPaletteIndex );
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// Note: width, x, and y are in texels, not S3 blocks.
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S3PaletteIndex S3TC_GetPaletteIndex(
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unsigned char *pFaceData,
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ImageFormat format,
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int imageWidth,
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int x,
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int y );
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// Note: width, x, and y are in texels, not S3 blocks.
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void S3TC_SetPaletteIndex(
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unsigned char *pFaceData,
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ImageFormat format,
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int imageWidth,
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int x,
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int y,
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S3PaletteIndex paletteIndex );
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const char* S3TC_GetBlock(
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const void *pCompressed,
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ImageFormat format,
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int nBlocksWide, // How many blocks wide is the image (pixels wide / 4).
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int xBlock,
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int yBlock );
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char* S3TC_GetBlock(
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void *pCompressed,
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ImageFormat format,
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int nBlocksWide, // How many blocks wide is the image (pixels wide / 4).
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int xBlock,
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int yBlock );
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// Merge the two palettes and copy the colors
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void S3TC_MergeBlocks(
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char **blocks,
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S3RGBA **pOriginals, // Original RGBA colors in the texture. This allows it to avoid doubly compressing.
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int nBlocks,
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int lPitch, // (in BYTES)
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ImageFormat format
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);
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// Convert an RGB565 color to RGBA8888.
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inline S3RGBA S3TC_RGBAFrom565( unsigned short color, unsigned char alphaValue=255 )
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{
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S3RGBA ret;
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ret.a = alphaValue;
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ret.r = (unsigned char)( (color >> 11) << 3 );
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ret.g = (unsigned char)( ((color >> 5) & 0x3F) << 2 );
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ret.b = (unsigned char)( (color & 0x1F) << 3 );
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return ret;
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}
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// Blend from one color to another..
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inline S3RGBA S3TC_RGBABlend( const S3RGBA &a, const S3RGBA &b, int aMul, int bMul, int div )
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{
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S3RGBA ret;
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ret.r = (unsigned char)(( (int)a.r * aMul + (int)b.r * bMul ) / div );
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ret.g = (unsigned char)(( (int)a.g * aMul + (int)b.g * bMul ) / div );
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ret.b = (unsigned char)(( (int)a.b * aMul + (int)b.b * bMul ) / div );
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ret.a = (unsigned char)(( (int)a.a * aMul + (int)b.a * bMul ) / div );
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return ret;
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}
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#endif // S3TC_DECODE_H
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