void CompressImage( u8 const* rgb, u8 a, 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 = rgb + 3*( width*sy + sx );
for( int i = 0; i < 3; ++i )
*targetPixel++ = *sourcePixel++;
*targetPixel++ = a;
// 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 Compress( u8 const* rgba, void* block, int flags )
{
// compress with full mask
CompressMasked( rgba, 0xffff, block, flags );
}
void CompressImage( u8 const* rgba, int width, int height, void* blocks, int flags, ProgressFn progressFn )
{
// fix any bad flags
flags = FixFlags( flags );
// initialise the block output
u8* targetBlock = reinterpret_cast< u8* >( blocks );
int bytesPerBlock = ( ( flags & kDxt1 ) != 0 ) ? 8 : 16;
int progress = 0;
if (progressFn != NULL)
{
progressFn(0, height);
}
// loop over blocks
#ifdef SQUISH_USE_OPENMP
#pragma omp parallel for shared(progress)
#endif
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
int blockNum = (((width + 3) / 4) * (y / 4)) + (x / 4);
u8* outputBlock = targetBlock + (bytesPerBlock * blockNum);
CompressMasked( sourceRgba, mask, outputBlock, flags );
}
#ifdef SQUISH_USE_OPENMP
#pragma omp atomic
#endif
progress += 4;
if (progressFn != NULL)
{
progressFn(progress, height);
}
}
if (progressFn != NULL)
{
progressFn(height, height);
}
}
