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@ -21,7 +21,7 @@ namespace ImageProcessor.Imaging.Formats |
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using System.Runtime.InteropServices; |
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using System.Text; |
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using ImageProcessor.Core.Common.Exceptions; |
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using ImageProcessor.Common.Exceptions; |
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/// <summary>
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/// Provides the necessary information to support webp images.
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@ -163,6 +163,10 @@ namespace ImageProcessor.Imaging.Formats |
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memoryStream.Position = stream.Position = 0; |
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} |
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} |
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else |
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{ |
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throw new ImageFormatException("Unable to encode WebP image."); |
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} |
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return image; |
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} |
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@ -183,36 +187,52 @@ namespace ImageProcessor.Imaging.Formats |
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IntPtr ptrData = pinnedWebP.AddrOfPinnedObject(); |
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uint dataSize = (uint)webpData.Length; |
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Bitmap bitmap = null; |
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BitmapData bitmapData = null; |
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IntPtr outputBuffer = IntPtr.Zero; |
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int width; |
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int height; |
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if (WebPGetInfo(ptrData, dataSize, out width, out height) != 1) |
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{ |
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throw new ImageFormatException("WebP image is corrupted."); |
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throw new ImageFormatException("WebP image header is corrupted."); |
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} |
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// Create a BitmapData and Lock all pixels to be written
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Bitmap bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb); |
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BitmapData bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.WriteOnly, bitmap.PixelFormat); |
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try |
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{ |
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// Create a BitmapData and Lock all pixels to be written
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bitmap = new Bitmap(width, height, PixelFormat.Format32bppArgb); |
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bitmapData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.WriteOnly, bitmap.PixelFormat); |
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// Allocate memory for uncompress image
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int outputBufferSize = bitmapData.Stride * height; |
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IntPtr outputBuffer = Marshal.AllocHGlobal(outputBufferSize); |
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// Allocate memory for uncompress image
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int outputBufferSize = bitmapData.Stride * height; |
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outputBuffer = Marshal.AllocHGlobal(outputBufferSize); |
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// Uncompress the image
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outputBuffer = WebPDecodeBGRAInto(ptrData, dataSize, outputBuffer, outputBufferSize, bitmapData.Stride); |
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// Uncompress the image
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outputBuffer = WebPDecodeBGRAInto(ptrData, dataSize, outputBuffer, outputBufferSize, bitmapData.Stride); |
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// Write image to bitmap using Marshal
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byte[] buffer = new byte[outputBufferSize]; |
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Marshal.Copy(outputBuffer, buffer, 0, outputBufferSize); |
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Marshal.Copy(buffer, 0, bitmapData.Scan0, outputBufferSize); |
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if (bitmapData.Scan0 != outputBuffer) |
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{ |
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throw new ImageFormatException("Failed to decode WebP image with error " + (long)outputBuffer); |
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} |
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// Unlock the pixels
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bitmap.UnlockBits(bitmapData); |
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// Write image to bitmap using Marshal
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byte[] buffer = new byte[outputBufferSize]; |
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Marshal.Copy(outputBuffer, buffer, 0, outputBufferSize); |
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Marshal.Copy(buffer, 0, bitmapData.Scan0, outputBufferSize); |
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} |
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finally |
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{ |
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// Unlock the pixels
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if (bitmap != null) |
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{ |
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bitmap.UnlockBits(bitmapData); |
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} |
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// Free memory
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pinnedWebP.Free(); |
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Marshal.FreeHGlobal(outputBuffer); |
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// Free memory
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pinnedWebP.Free(); |
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Marshal.FreeHGlobal(outputBuffer); |
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} |
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return bitmap; |
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} |
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@ -235,29 +255,34 @@ namespace ImageProcessor.Imaging.Formats |
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private static bool EncodeLossly(Bitmap bitmap, int quality, out byte[] webpData) |
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{ |
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webpData = null; |
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BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb); |
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IntPtr unmanagedData = IntPtr.Zero; |
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bool encoded; |
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try |
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{ |
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BitmapData bmpData = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, PixelFormat.Format32bppArgb); |
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IntPtr unmanagedData; |
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// Attempt to lossy encode the image.
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int size = WebPEncodeBGRA(bmpData.Scan0, bitmap.Width, bitmap.Height, bmpData.Stride, quality, out unmanagedData); |
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// Copy image compress data to output array
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webpData = new byte[size]; |
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Marshal.Copy(unmanagedData, webpData, 0, size); |
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encoded = true; |
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} |
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catch |
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{ |
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encoded = false; |
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} |
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finally |
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{ |
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// Unlock the pixels
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bitmap.UnlockBits(bmpData); |
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// Free memory
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WebPFree(unmanagedData); |
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return true; |
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} |
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catch |
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{ |
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return false; |
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} |
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return encoded; |
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} |
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/// <summary>
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@ -335,13 +360,13 @@ namespace ImageProcessor.Imaging.Formats |
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/// <summary>
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/// Frees the unmanaged memory.
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/// </summary>
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/// <param name="p">
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/// <param name="pointer">
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/// The pointer.
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/// </param>
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/// <returns>
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/// 1 if success, otherwise error code returned in the case of (a) error(s).
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/// </returns>
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[DllImport("libwebp.dll", CallingConvention = CallingConvention.Cdecl)] |
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private static extern int WebPFree(IntPtr p); |
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private static extern int WebPFree(IntPtr pointer); |
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} |
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} |
James South
12 years ago