private static void WriteBmpFrame(CommandLineOptions opts, ParseContext context, IcoFrame frame)
{
var encoding = opts.BitmapEncodingOverride ?? BmpUtil.GetIdealBitmapEncoding(frame.CookedData, hasIcoMask: true);
if (opts.MaskImagePath != null)
{
var maskSource = File.ReadAllBytes(opts.MaskImagePath);
using (var stream = new MemoryStream(maskSource))
{
var decoder = new SixLabors.ImageSharp.Formats.Bmp.BmpDecoder();
var mask = decoder.Decode <Rgba32>(new Configuration(), stream);
if (mask.Width != frame.CookedData.Width || mask.Height != frame.CookedData.Height)
{
Reporter.ErrorLine(
IcoErrorCode.BitmapMaskWrongDimensions,
$"The mask's dimentions {mask.Height}x{mask.Width} don't match "
+ $"the frame dimensions {frame.CookedData.Height}x{frame.CookedData.Width}.",
opts.MaskImagePath);
throw new ArgumentException();
}
for (var x = 0; x < mask.Width; x++)
{
for (var y = 0; y < mask.Height; y++)
{
if (mask[x, y].PackedValue != 0xffffffff && mask[x, y].PackedValue != 0x000000ff)
{
Reporter.ErrorLine(
IcoErrorCode.BitampMaskWrongColors,
$"The mask must be comprised entirely of black and white pixels (where black means transparent).",
opts.MaskImagePath);
throw new ArgumentException();
}
}
}
frame.Mask = BmpUtil.CreateMaskFromImage(mask, blackIsTransparent: true);
}
}
else
{
frame.Mask = BmpUtil.CreateMaskFromImage(frame.CookedData, blackIsTransparent: false);
}
frame.RawData = BmpEncoder.EncodeBitmap(context, encoding, BmpEncoder.Dialect.Ico, frame);
if (frame.RawData == null)
{
Reporter.ErrorLine(context.LastEncodeError, $"Cannot encode the source image as a bitmap of type: {encoding}. Try reducing the number of colors, or changing the bitmap encoding.", opts.SourceImagePath);
throw new ArgumentException();
}
frame.Encoding.ClaimedBitDepth = (uint)BmpUtil.GetBitDepthForPixelFormat(encoding);
frame.Encoding.ActualBitDepth = frame.Encoding.ClaimedBitDepth;
}
private static IcoFrame GetBestEncodingForFrame(ParseContext context, CommandLineOptions opts, IcoFrame source)
{
var result = new IcoFrameEncoding
{
ClaimedBitDepth = source.Encoding.ClaimedBitDepth,
ClaimedHeight = source.Encoding.ClaimedHeight,
ClaimedWidth = source.Encoding.ClaimedWidth,
ActualHeight = (uint)source.CookedData.Height,
ActualWidth = (uint)source.CookedData.Width,
};
byte[] png = null;
byte[] bitmap = null;
var policy = opts.BestFormatPolicy;
if (policy == BestFormatPolicy.Inherited)
{
policy = BestFormatPolicy.PreserveSource;
}
if (source.Encoding.ClaimedHeight == 16 &&
source.Encoding.ClaimedWidth == 16 &&
source.Encoding.ClaimedBitDepth == 32 &&
opts.BestFormatPolicy16x16x32 != BestFormatPolicy.Inherited)
{
policy = opts.BestFormatPolicy16x16x32;
}
if (source.Encoding.ClaimedHeight == 32 &&
source.Encoding.ClaimedWidth == 32 &&
source.Encoding.ClaimedBitDepth == 32 &&
opts.BestFormatPolicy32x32x32 != BestFormatPolicy.Inherited)
{
policy = opts.BestFormatPolicy32x32x32;
}
if (policy != BestFormatPolicy.AlwaysBmp &&
(source.Encoding.ClaimedBitDepth == 32 || opts.BestFormatPolicy == BestFormatPolicy.AlwaysPng))
{
png = EncodePng(source, context);
if (opts.PngToolPath != null)
{
png = ReprocessPngFile(png, context, opts);
}
}
if (opts.BestFormatPolicy != BestFormatPolicy.AlwaysPng)
{
foreach (var encoding in _allEncodings)
{
if (encoding == BitmapEncoding.Pixel_indexed2)
{
switch (opts.Emit2BitBitmaps)
{
case StrictnessPolicy.Compliant:
continue;
case StrictnessPolicy.PreserveSource:
if (source.Encoding.PixelFormat != BitmapEncoding.Pixel_indexed2)
{
continue;
}
break;
case StrictnessPolicy.Loose:
break;
}
}
if (encoding == BitmapEncoding.Pixel_rgb24)
{
switch (opts.Emit24BitBitmaps)
{
case StrictnessPolicy.Compliant:
continue;
case StrictnessPolicy.PreserveSource:
if (source.Encoding.PixelFormat != BitmapEncoding.Pixel_rgb24)
{
continue;
}
break;
case StrictnessPolicy.Loose:
break;
}
}
if (source.Encoding.PixelFormat != encoding)
{
if (!opts.AllowDownsample)
{
continue;
}
// Going to rgb15 can lose some color data, due to rounding. Avoid unless the source
// was already in rgb15.
if (encoding == BitmapEncoding.Pixel_rgb15)
{
continue;
}
// Don't lose the per-pixel alpha channel, if one was in the source.
if (source.Encoding.PixelFormat == BitmapEncoding.Pixel_argb32 && BmpUtil.IsAlphaSignificant(source))
{
continue;
}
}
bitmap = BmpEncoder.EncodeBitmap(context, encoding, BmpEncoder.Dialect.Ico, source);
if (bitmap != null)
{
result.PixelFormat = encoding;
break;
}
}
}
switch (opts.BestFormatPolicy)
{
case BestFormatPolicy.PreserveSource:
result.Type = source.Encoding.Type;
break;
case BestFormatPolicy.MinimizeStorage:
result.Type = (bitmap.Length < ((png?.Length ?? 0) + opts.PngSizePenalty))
? IcoEncodingType.Bitmap
: IcoEncodingType.Png;
break;
case BestFormatPolicy.PngLargeImages:
result.Type = (source.CookedData.Width >= opts.LargeImagePixelThreshold)
? IcoEncodingType.Png
: IcoEncodingType.Bitmap;
break;
case BestFormatPolicy.AlwaysPng:
result.Type = IcoEncodingType.Png;
break;
case BestFormatPolicy.AlwaysBmp:
result.Type = IcoEncodingType.Bitmap;
break;
default:
break;
}
if (png == null && result.Type == IcoEncodingType.Png)
{
result.Type = IcoEncodingType.Bitmap;
}
var finalData = (result.Type == IcoEncodingType.Bitmap) ? bitmap : png;
return(new IcoFrame {
Encoding = result, RawData = finalData
});
}