void SharpSquish_BlockAdvance(SharpSquishBlockAdvanceEventArgs e)
{
e.Cancel = _cancel;
progressBar1.Maximum = e.Blocks;
if (e.Current <= e.Blocks)
progressBar1.Value = e.Current;
else
progressBar1.Value = progressBar1.Maximum;
if ((e.Current - _last) > 60)
{
Application.DoEvents();
_last = e.Current;
}
}
/// <summary>
/// Compresses an image in memory.
/// </summary>
/// <param name="rgba">The pixels of the source.</param>
/// <param name="width">The width of the source image.</param>
/// <param name="height">The height of the source image.</param>
/// <param name="blocks">Storage for the compressed output.</param>
/// <param name="flags">Compression flags.</param>
public static unsafe void CompressImage(byte* rgba, int width, int height, byte* blocks, SquishFlags flags)
{
bool b_cancel = false;
// fix any bad flags
flags = FixFlags(flags);
// initialise the block output
byte* targetBlock = blocks;
int bytesPerBlock = BytesPerBlock(flags);
int current = 0, blocksCount = GetBlocksCount(width, height);
// 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
byte[] sourceRgba = new byte[16 * 4];
fixed (byte* fixSourceRgba = sourceRgba)
{
byte* targetPixel = fixSourceRgba;
//byte* 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
byte* 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(fixSourceRgba, mask, targetBlock, flags);
}
if (BlockAdvance != null)
{
SharpSquishBlockAdvanceEventArgs e = new SharpSquishBlockAdvanceEventArgs();
e.Current = current;
e.Blocks = blocksCount;
BlockAdvance(e);
if (e.Cancel)
{
b_cancel = true;
break;
}
}
// advance
targetBlock += bytesPerBlock;
current++;
}
if (b_cancel)
break;
}
}