/// <summary>
/// Updates the specified atlas with a given TexImage.
/// </summary>
/// <param name="atlas">The atlas.</param>
/// <param name="request">The request.</param>
/// <exception cref="TexLibraryException">The request texture name + request.Name + doesn't exist in this atlas.</exception>
private void Update(TexAtlas atlas, AtlasUpdateRequest request)
{
if (!atlas.Layout.TexList.ContainsKey(request.Name))
{
Log.Error("The given texture name " + request.Name + " doesn't exist in this atlas.");
throw new TextureToolsException("The given texture name " + request.Name + " doesn't exist in this atlas.");
}
TexAtlas.TexLayout.Position position = atlas.Layout.TexList[request.Name];
if (request.Texture.Width != position.Width || request.Texture.Height != position.Height)
{
Log.Error("The given texture must match the dimension of the one you want to update in the atlas.");
throw new TextureToolsException("The given texture must match the dimension of the one you want to update in the atlas.");
}
int mipmapCount = 0;
int w = position.Width;
int h = position.Height;
do
{
++mipmapCount;
w >>= 1;
h >>= 1;
}while (w >= 1 && h >= 1 && mipmapCount < atlas.MipmapCount);
w = position.Width;
h = position.Height;
int x = position.UOffset;
int y = position.VOffset;
long subImageData, atlasData;
int xOffset, yOffset;
for (int i = 0; i < mipmapCount; ++i)
{
xOffset = (int)((Decimal)x / atlas.SubImageArray[i].Width * atlas.SubImageArray[i].RowPitch);
yOffset = y * atlas.SubImageArray[i].RowPitch;
subImageData = request.Texture.SubImageArray[i].Data.ToInt64();
atlasData = atlas.SubImageArray[i].Data.ToInt64();
for (int j = 0; j < h; ++j)
{
Utilities.CopyMemory(new IntPtr(atlasData + j * atlas.SubImageArray[i].RowPitch + yOffset + xOffset), new IntPtr(subImageData + j * request.Texture.SubImageArray[i].RowPitch), request.Texture.SubImageArray[i].RowPitch);
}
w = w > 1 ? w >>= 1 : w;
h = h > 1 ? h >>= 1 : h;
x = x <= 1 ? 0 : x >>= 1;
y = y <= 1 ? 0 : y >>= 1;
}
}
/// <summary>
/// Extracts the specified texture from the atlas.
/// </summary>
/// <param name="atlas">The atlas.</param>
/// <param name="texture">The texture that will be filled.</param>
/// <param name="position">The position of the texture in the atlas.</param>
private void ExtractTexture(TexAtlas atlas, TexImage texture, TexAtlas.TexLayout.Position position, int minimumMipmapSize)
{
texture.Format = atlas.Format;
int x, y, w, h, rowPitch, slicePitch, mipmapCount, dataSize, offset;
dataSize = 0;
mipmapCount = 0;
w = position.Width;
h = position.Height;
do
{
Tools.ComputePitch(texture.Format, w, h, out rowPitch, out slicePitch);
dataSize += slicePitch;
++mipmapCount;
w >>= 1;
h >>= 1;
}while (w >= minimumMipmapSize && h >= minimumMipmapSize && mipmapCount < atlas.MipmapCount);
texture.MipmapCount = mipmapCount;
texture.SubImageArray = new TexImage.SubImage[mipmapCount];
texture.Data = Marshal.AllocHGlobal(dataSize);
texture.DataSize = dataSize;
texture.Width = position.Width;
texture.Height = position.Height;
long atlasData, textureData;
int xOffset, yOffset;
IntPtr destPtr, srcPtr;
w = position.Width;
h = position.Height;
x = position.UOffset;
y = position.VOffset;
offset = 0;
for (int i = 0; i < mipmapCount; ++i)
{
Tools.ComputePitch(texture.Format, w, h, out rowPitch, out slicePitch);
texture.SubImageArray[i] = new TexImage.SubImage();
texture.SubImageArray[i].Data = new IntPtr(texture.Data.ToInt64() + offset);
texture.SubImageArray[i].DataSize = slicePitch;
texture.SubImageArray[i].Width = w;
texture.SubImageArray[i].Height = h;
texture.SubImageArray[i].RowPitch = rowPitch;
texture.SubImageArray[i].SlicePitch = slicePitch;
atlasData = atlas.SubImageArray[i].Data.ToInt64();
textureData = texture.SubImageArray[i].Data.ToInt64();
xOffset = (int)((Decimal)x / atlas.SubImageArray[i].Width * atlas.SubImageArray[i].RowPitch);
yOffset = y * atlas.SubImageArray[i].RowPitch;
for (int j = 0; j < h; ++j)
{
srcPtr = new IntPtr(atlasData + j * atlas.SubImageArray[i].RowPitch + yOffset + xOffset);
destPtr = new IntPtr(textureData + j * rowPitch);
Utilities.CopyMemory(destPtr, srcPtr, rowPitch);
}
offset += slicePitch;
w = w > 1 ? w >>= 1 : w;
h = h > 1 ? h >>= 1 : h;
x = x <= 1 ? 0 : x >>= 1;
y = y <= 1 ? 0 : y >>= 1;
}
texture.RowPitch = texture.SubImageArray[0].RowPitch;
texture.SlicePitch = texture.SubImageArray[0].SlicePitch;
texture.DisposingLibrary = this;
}
