markus / KCOM / Common / ImageSourceHelper.cs @ 82fd7a58
이력 | 보기 | 이력해설 | 다운로드 (6.8 KB)
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using System; |
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using System.Collections.Generic; |
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using System.Linq; |
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using System.Text; |
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using System.Threading.Tasks; |
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using System.Windows.Media; |
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using System.Windows.Media.Imaging; |
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namespace KCOM.Common |
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{
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public static class ImageSourceHelper |
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{
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public static async System.Threading.Tasks.Task<BitmapImage> GetDownloadImageAsync(Uri uri, double pageWidth, double pageHeight) |
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{
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System.Net.Http.HttpClient httpClient = null; |
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System.IO.Stream responseStream = null; |
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System.IO.MemoryStream memoryStream = null; |
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BitmapImage image = null; |
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try |
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{
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using (httpClient = new System.Net.Http.HttpClient()) |
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{
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using (responseStream = await httpClient.GetStreamAsync(uri)) |
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{
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using (memoryStream = new System.IO.MemoryStream()) |
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{
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System.Diagnostics.Debug.WriteLine("이미지 다운로드");
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await responseStream.CopyToAsync(memoryStream); |
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image = new BitmapImage(); |
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image.BeginInit(); |
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image.CacheOption = BitmapCacheOption.OnLoad; |
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image.StreamSource = memoryStream; |
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image.DecodePixelWidth = (int)pageWidth; |
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image.DecodePixelHeight = (int)pageHeight; |
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image.EndInit(); |
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image.Freeze(); |
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return image; |
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} |
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} |
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} |
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} |
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catch (Exception ex) |
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{
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throw new Exception("Image Load Error ", ex);
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} |
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finally |
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{
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httpClient?.Dispose(); |
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responseStream?.Dispose(); |
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memoryStream?.Dispose(); |
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image = null; |
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} |
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} |
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public static byte[] CopyPixels(BitmapSource image) |
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{
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byte[] result = new byte[image.PixelWidth * image.PixelHeight * 4]; |
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image.CopyPixels(result, image.PixelWidth * 4, 0); |
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return result; |
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} |
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public static byte[] SetBrightness(int brightness, byte[] pixels) |
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{
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for (int i = 0; i < pixels.Length / 4; ++i) |
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{
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byte b = pixels[i * 4]; |
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byte g = pixels[i * 4 + 1]; |
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byte r = pixels[i * 4 + 2]; |
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byte a = pixels[i * 4 + 3]; |
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if (r != 255 || g != 255 || b != 255 || a == 255) |
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{
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b = (byte)(b + brightness); |
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g = (byte)(g + brightness); |
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r = (byte)(r + brightness); |
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///a = (byte)(a + brightness); |
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if (r < 0) r = 1; |
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if (r > 255) r = 255; |
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if (g < 0) g = 1; |
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if (g > 255) g = 255; |
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if (b < 0) b = 1; |
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if (b > 255) b = 255; |
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pixels[i * 4] = b; |
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pixels[i * 4 + 1] = g; |
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pixels[i * 4 + 2] = r; |
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} |
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} |
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return pixels; |
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} |
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public static byte[] SetBrightnessAndContrast(int brightness,double contrast, byte[] pixels) |
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{
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if (contrast < -100) contrast = -100; |
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if (contrast > 100) contrast = 100; |
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contrast = (100.0 + contrast) / 100.0; |
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contrast *= contrast; |
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for (int i = 0; i < pixels.Length / 4; ++i) |
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{
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byte b = pixels[i * 4]; |
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byte g = pixels[i * 4 + 1]; |
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byte r = pixels[i * 4 + 2]; |
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byte a = pixels[i * 4 + 3]; |
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if (r != 255 || g != 255 || b != 255 || a == 255) |
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{
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b = (byte)(b + brightness); |
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g = (byte)(g + brightness); |
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r = (byte)(r + brightness); |
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///a = (byte)(a + brightness); |
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if (r < 0) r = 1; |
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if (r > 255) r = 255; |
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if (g < 0) g = 1; |
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if (g > 255) g = 255; |
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if (b < 0) b = 1; |
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if (b > 255) b = 255; |
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double pR = r / 255.0; |
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pR -= 0.5; |
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pR *= contrast; |
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pR += 0.5; |
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pR *= 255; |
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if (pR < 0) pR = 0; |
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if (pR > 255) pR = 255; |
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double pG = g / 255.0; |
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pG -= 0.5; |
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pG *= contrast; |
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pG += 0.5; |
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pG *= 255; |
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if (pG < 0) pG = 0; |
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if (pG > 255) pG = 255; |
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double pB = b / 255.0; |
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pB -= 0.5; |
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pB *= contrast; |
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pB += 0.5; |
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pB *= 255; |
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if (pB < 0) pB = 0; |
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if (pB > 255) pB = 255; |
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pixels[i * 4] = (byte)pB; |
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pixels[i * 4 + 1] = (byte)pG; |
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pixels[i * 4 + 2] = (byte)pR; |
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} |
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} |
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return pixels; |
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} |
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public static byte[] SetContrast(double contrast, byte[] pixels) |
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{
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if (contrast < -100) contrast = -100; |
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if (contrast > 100) contrast = 100; |
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contrast = (100.0 + contrast) / 100.0; |
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contrast *= contrast; |
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for (int i = 0; i < pixels.Length / 4; ++i) |
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{
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byte b = pixels[i * 4]; |
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byte g = pixels[i * 4 + 1]; |
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byte r = pixels[i * 4 + 2]; |
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byte a = pixels[i * 4 + 3]; |
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if (r != 255 || g != 255 || b != 255 || a == 255) |
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{
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double pR = r / 255.0; |
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pR -= 0.5; |
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pR *= contrast; |
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pR += 0.5; |
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pR *= 255; |
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if (pR < 0) pR = 0; |
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if (pR > 255) pR = 255; |
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double pG = g / 255.0; |
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pG -= 0.5; |
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pG *= contrast; |
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pG += 0.5; |
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pG *= 255; |
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if (pG < 0) pG = 0; |
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if (pG > 255) pG = 255; |
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double pB = b / 255.0; |
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pB -= 0.5; |
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pB *= contrast; |
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pB += 0.5; |
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pB *= 255; |
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if (pB < 0) pB = 0; |
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if (pB > 255) pB = 255; |
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pixels[i * 4] = (byte)pB; |
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pixels[i * 4 + 1] = (byte)pG; |
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pixels[i * 4 + 2] = (byte)pR; |
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} |
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} |
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return pixels; |
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} |
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} |
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} |
