Re: SkiaSharp and wmf

[Brian Osman]

Skia does support GIF (src/codec/SkGifCodec.cpp), so I think the problem is just that we don't support WMF. Unfortunately, I don't see any good solution - WMF support appears to be very difficult to find - even WIC doesn't support it.

On Fri, Jul 20, 2018 at 5:22 AM 'Amy Harris' via skia-discuss <skia-d...@googlegroups.com> wrote:

Hi

I'm trying to open a WMF file using SkiaSharp in order to save it as a png. It reads into the SKMemoryStream object with no issues, but when reading sourceStream into the SKCodec object, the SKCodec object is returned null. I know Skia doesn't handle WMFs but it also doesn't handle GIFs, and those files can be read by the SKCodec object with no errors. Can anyone assist?

private static byte[] ConvertObsoleteFileType(byte[] imageData, out string newExtension)
    {
        using (SKMemoryStream sourceStream = new SKMemoryStream(imageData))
        {
            newExtension = ".png";

            using (SKCodec codec = SKCodec.Create(sourceStream))
            {
                sourceStream.Seek(0);

                using (SKImage image = SKImage.FromEncodedData(SKData.Create(sourceStream)))
                {
                    using (SKSurface surface = SKSurface.Create(codec.Info.ColorSpace.IsSrgb ? new SKImageInfo(image.Width, image.Height) : new SKImageInfo(image.Width, image.Height, SKImageInfo.PlatformColorType, SKAlphaType.Premul, SKColorSpace.CreateSrgb())))
                    {
                        using (SKPaint paint = new SKPaint())
                        {
                            // High quality without antialiasing
                            paint.IsAntialias = true;
                            paint.FilterQuality = SKFilterQuality.High;

                            // Draw the bitmap to fill the surface
                            surface.Canvas.Clear(SKColors.White);
                            surface.Canvas.DrawImage(image, new SKRect(0, 0, image.Width, image.Height), paint);
                            surface.Canvas.Flush();

                            using (SKImage newImage = surface.Snapshot())
                            {
                                using (SKData newImageData = newImage.Encode(SKEncodedImageFormat.Png, 100))
                                {
                                    return newImageData.ToArray();
                                }
                            }
                        }
                    }
                }
            }
        }
    }

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[Matthew Leibowitz]

Skia supports READING .gif files.

Keep in mind that skia supports READING many raster formats, but can only WRITE to a few, such as .png, .webp, .jpeg