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-rw-r--r--drivers/squish/squish.cpp239
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diff --git a/drivers/squish/squish.cpp b/drivers/squish/squish.cpp
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-/* -----------------------------------------------------------------------------
-
- Copyright (c) 2006 Simon Brown si@sjbrown.co.uk
-
- Permission is hereby granted, free of charge, to any person obtaining
- a copy of this software and associated documentation files (the
- "Software"), to deal in the Software without restriction, including
- without limitation the rights to use, copy, modify, merge, publish,
- distribute, sublicense, and/or sell copies of the Software, and to
- permit persons to whom the Software is furnished to do so, subject to
- the following conditions:
-
- The above copyright notice and this permission notice shall be included
- in all copies or substantial portions of the Software.
-
- THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
- OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
- MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
- IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY
- CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,
- TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE
- SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
-
- -------------------------------------------------------------------------- */
-
-#include "squish/squish.h"
-#include "colourset.h"
-#include "maths.h"
-#include "rangefit.h"
-#include "clusterfit.h"
-#include "colourblock.h"
-#include "alpha.h"
-#include "singlecolourfit.h"
-
-namespace squish {
-
-static int FixFlags( int flags )
-{
- // grab the flag bits
- int method = flags & ( kDxt1 | kDxt3 | kDxt5 );
- int fit = flags & ( kColourIterativeClusterFit | kColourClusterFit | kColourRangeFit );
- int metric = flags & ( kColourMetricPerceptual | kColourMetricUniform );
- int extra = flags & kWeightColourByAlpha;
-
- // set defaults
- if( method != kDxt3 && method != kDxt5 )
- method = kDxt1;
- if( fit != kColourRangeFit )
- fit = kColourClusterFit;
- if( metric != kColourMetricUniform )
- metric = kColourMetricPerceptual;
-
- // done
- return method | fit | metric | extra;
-}
-
-void Compress( u8 const* rgba, void* block, int flags )
-{
- // compress with full mask
- CompressMasked( rgba, 0xffff, block, flags );
-}
-
-void CompressMasked( u8 const* rgba, int mask, void* block, int flags )
-{
- // fix any bad flags
- flags = FixFlags( flags );
-
- // get the block locations
- void* colourBlock = block;
- void* alphaBock = block;
- if( ( flags & ( kDxt3 | kDxt5 ) ) != 0 )
- colourBlock = reinterpret_cast< u8* >( block ) + 8;
-
- // create the minimal point set
- ColourSet colours( rgba, mask, flags );
-
- // check the compression type and compress colour
- if( colours.GetCount() == 1 )
- {
- // always do a single colour fit
- SingleColourFit fit( &colours, flags );
- fit.Compress( colourBlock );
- }
- else if( ( flags & kColourRangeFit ) != 0 || colours.GetCount() == 0 )
- {
- // do a range fit
- RangeFit fit( &colours, flags );
- fit.Compress( colourBlock );
- }
- else
- {
- // default to a cluster fit (could be iterative or not)
- ClusterFit fit( &colours, flags );
- fit.Compress( colourBlock );
- }
-
- // compress alpha separately if necessary
- if( ( flags & kDxt3 ) != 0 )
- CompressAlphaDxt3( rgba, mask, alphaBock );
- else if( ( flags & kDxt5 ) != 0 )
- CompressAlphaDxt5( rgba, mask, alphaBock );
-}
-
-void Decompress( u8* rgba, void const* block, int flags )
-{
- // fix any bad flags
- flags = FixFlags( flags );
-
- // get the block locations
- void const* colourBlock = block;
- void const* alphaBock = block;
- if( ( flags & ( kDxt3 | kDxt5 ) ) != 0 )
- colourBlock = reinterpret_cast< u8 const* >( block ) + 8;
-
- // decompress colour
- DecompressColour( rgba, colourBlock, ( flags & kDxt1 ) != 0 );
-
- // decompress alpha separately if necessary
- if( ( flags & kDxt3 ) != 0 )
- DecompressAlphaDxt3( rgba, alphaBock );
- else if( ( flags & kDxt5 ) != 0 )
- DecompressAlphaDxt5( rgba, alphaBock );
-}
-
-int GetStorageRequirements( int width, int height, int flags )
-{
- // fix any bad flags
- flags = FixFlags( flags );
-
- // compute the storage requirements
- int blockcount = ( ( width + 3 )/4 ) * ( ( height + 3 )/4 );
- int blocksize = ( ( flags & kDxt1 ) != 0 ) ? 8 : 16;
- return blockcount*blocksize;
-}
-
-void CompressImage( u8 const* rgba, int width, int height, void* blocks, int flags )
-{
- // fix any bad flags
- flags = FixFlags( flags );
-
- // initialise the block output
- u8* targetBlock = reinterpret_cast< u8* >( blocks );
- int bytesPerBlock = ( ( flags & kDxt1 ) != 0 ) ? 8 : 16;
-
- // loop over blocks
- for( int y = 0; y < height; y += 4 )
- {
- for( int x = 0; x < width; x += 4 )
- {
- // build the 4x4 block of pixels
- u8 sourceRgba[16*4];
- u8* targetPixel = sourceRgba;
- int mask = 0;
- for( int py = 0; py < 4; ++py )
- {
- for( int px = 0; px < 4; ++px )
- {
- // get the source pixel in the image
- int sx = x + px;
- int sy = y + py;
-
- // enable if we're in the image
- if( sx < width && sy < height )
- {
- // copy the rgba value
- u8 const* sourcePixel = rgba + 4*( width*sy + sx );
- for( int i = 0; i < 4; ++i )
- *targetPixel++ = *sourcePixel++;
-
- // enable this pixel
- mask |= ( 1 << ( 4*py + px ) );
- }
- else
- {
- // skip this pixel as its outside the image
- targetPixel += 4;
- }
- }
- }
-
- // compress it into the output
- CompressMasked( sourceRgba, mask, targetBlock, flags );
-
- // advance
- targetBlock += bytesPerBlock;
- }
- }
-}
-
-void DecompressImage( u8* rgba, int width, int height, void const* blocks, int flags )
-{
- // fix any bad flags
- flags = FixFlags( flags );
-
- // initialise the block input
- u8 const* sourceBlock = reinterpret_cast< u8 const* >( blocks );
- int bytesPerBlock = ( ( flags & kDxt1 ) != 0 ) ? 8 : 16;
-
- // loop over blocks
- for( int y = 0; y < height; y += 4 )
- {
- for( int x = 0; x < width; x += 4 )
- {
- // decompress the block
- u8 targetRgba[4*16];
- Decompress( targetRgba, sourceBlock, flags );
-
- // write the decompressed pixels to the correct image locations
- u8 const* sourcePixel = targetRgba;
- for( int py = 0; py < 4; ++py )
- {
- for( int px = 0; px < 4; ++px )
- {
- // get the target location
- int sx = x + px;
- int sy = y + py;
- if( sx < width && sy < height )
- {
- u8* targetPixel = rgba + 4*( width*sy + sx );
-
- // copy the rgba value
- for( int i = 0; i < 4; ++i )
- *targetPixel++ = *sourcePixel++;
- }
- else
- {
- // skip this pixel as its outside the image
- sourcePixel += 4;
- }
- }
- }
-
- // advance
- sourceBlock += bytesPerBlock;
- }
- }
-}
-
-} // namespace squish
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