/// <summary>
/// Converts a System.Drawing.Bitmap to a DirectX 11 texture object.
/// </summary>
/// <param name="device">Device on which the resource should be created.</param>
/// <param name="bitmap">The source bitmap.</param>
internal static D3D11.ID3D11Texture2D LoadTextureFromBitmap(EngineDevice device, GDI.Bitmap bitmap)
{
device.EnsureNotNull(nameof(device));
bitmap.EnsureNotNull(nameof(bitmap));
return(LoadTextureFromBitmap(device, bitmap, 1));
}
/// <summary>
/// Calculate a difference between two pictures
/// </summary>
/// <param name="bitmapLeft">The first bitmap for the comparison.</param>
/// <param name="bitmapRight">The second bitmap for the comparison.</param>
/// <returns>Difference of both bitmaps in percent</returns>
public static float CalculatePercentageDifference(GDI.Bitmap bitmapLeft, GDI.Bitmap bitmapRight)
{
bitmapLeft.EnsureNotNull(nameof(bitmapLeft));
bitmapRight.EnsureNotNull(nameof(bitmapRight));
if (bitmapLeft.Size != bitmapRight.Size)
{
throw new SeeingSharpException("Both bitmaps musst have the same size!");
}
var totalDiffPercent = 0M;
var lockRect = new GDI.Rectangle(
new GDI.Point(0, 0),
bitmapLeft.Size);
var dataLeft = bitmapLeft.LockBits(lockRect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
var dataRight = bitmapRight.LockBits(lockRect, ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
try
{
unsafe
{
var dataLeftP = (byte *)dataLeft.Scan0.ToPointer();
var dataRightP = (byte *)dataRight.Scan0.ToPointer();
decimal pixelCount = lockRect.Width * lockRect.Height;
for (var loopY = 0; loopY < lockRect.Height; loopY++)
{
for (var loopX = 0; loopX < lockRect.Width; loopX++)
{
// Calculate the memory location of the current pixel
var currentLoc = loopY * lockRect.Height * 4 + loopX * 4;
// Get the maximum difference on this pixel on one color channel
var diffA = Math.Abs(dataLeftP[currentLoc] - dataRightP[currentLoc]);
var diffR = Math.Abs(dataLeftP[currentLoc + 1] - dataRightP[currentLoc + 1]);
var diffG = Math.Abs(dataLeftP[currentLoc + 2] - dataRightP[currentLoc + 2]);
var diffB = Math.Abs(dataLeftP[currentLoc + 3] - dataRightP[currentLoc + 3]);
var maxDiff = Math.Max(diffA, Math.Max(diffR, Math.Max(diffG, diffB)));
if (maxDiff > MAX_PER_PIXEL_DIFF)
{
maxDiff = MAX_PER_PIXEL_DIFF;
}
// Calculate the difference factor on this pixel and add it to the total difference value
var pixelDiffPercent =
maxDiff / MAX_PER_PIXEL_DIFF_DEC;
totalDiffPercent += pixelDiffPercent / pixelCount;
}
}
}
}
finally
{
bitmapLeft.UnlockBits(dataLeft);
bitmapRight.UnlockBits(dataRight);
}
return((float)totalDiffPercent);
}
/// <summary>
/// Converts a System.Drawing.Bitmap to a DirectX 11 texture object.
/// </summary>
/// <param name="device">Device on which the resource should be created.</param>
/// <param name="bitmap">The source bitmap.</param>
/// <param name="mipLevels">Total count of levels for mipmapping.</param>
internal static D3D11.ID3D11Texture2D LoadTextureFromBitmap(EngineDevice device, GDI.Bitmap bitmap, int mipLevels)
{
device.EnsureNotNull(nameof(device));
bitmap.EnsureNotNull(nameof(bitmap));
mipLevels.EnsurePositiveOrZero(nameof(mipLevels));
D3D11.ID3D11Texture2D?result = null;
// Lock bitmap so it can be accessed for texture loading
var bitmapData = bitmap.LockBits(
new GDI.Rectangle(0, 0, bitmap.Width, bitmap.Height),
ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb);
try
{
// Open a reading stream for bitmap memory
var dataRectangle = new D3D11.SubresourceData(bitmapData.Scan0, bitmap.Width * 4);
// Load the texture
result = device.Internals.DeviceD3D11_1.CreateTexture2D(
new D3D11.Texture2DDescription
{
BindFlags = D3D11.BindFlags.ShaderResource | D3D11.BindFlags.RenderTarget,
CpuAccessFlags = D3D11.CpuAccessFlags.None,
Format = GraphicsHelper.Internals.DEFAULT_TEXTURE_FORMAT,
OptionFlags = D3D11.ResourceOptionFlags.None | D3D11.ResourceOptionFlags.GenerateMips,
MipLevels = 0,
Usage = D3D11.ResourceUsage.Default,
Width = bitmap.Width,
Height = bitmap.Height,
ArraySize = 1,
SampleDescription = new SampleDescription(1, 0)
},
new[]
{
dataRectangle, dataRectangle, dataRectangle, dataRectangle,
dataRectangle, dataRectangle, dataRectangle, dataRectangle,
dataRectangle, dataRectangle, dataRectangle, dataRectangle
});
// Workaround for now... auto generate mip-levels
using var shaderResourceView = device.Internals.DeviceD3D11_1.CreateShaderResourceView(result);
device.Internals.DeviceImmediateContextD3D11.GenerateMips(shaderResourceView);
}
finally
{
// Free bitmap-access resources
bitmap.UnlockBits(bitmapData);
}
return(result);
}
