質問編集履歴
2
タイトルを変更
test
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@@ -1 +1 @@
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UWP InkCanvas アニメーションGIFの書き込みについて
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UWP InkCanvas アニメーションGIFのバイナリ書き込みをすると背景が黒くなることについて
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test
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File without changes
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コードを追加
test
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File without changes
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test
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@@ -4,338 +4,524 @@
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どなたかご教授ください。お願いします。
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以下ファイル書き込みコードの一部です。
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```C#
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//アニメーションGif(isfメタデータの)を書き出す
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public async void Write(StorageFile file, UInt16 delayTime)
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{
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IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.ReadWrite);
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MemoryStream memoryStream = new MemoryStream();
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BinaryWriter binaryWriter = new BinaryWriter(fileStream.AsStream());
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bool hasGlobalColorTable = false; //グローバルカラーテーブルがあるか
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int colorTableSize = 0; //カラーテーブルのサイズ
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//アプリケーションで指定したファイルのリアルタイム更新を遅延
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//Prevent updates to the file until updates are
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//finalized with call to CompleteUpdatesAsync.
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CachedFileManager.DeferUpdates(file);
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for (int i = 0; i < sketchBook.Count; i++)
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{
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//InkCanvasからすべてのstrokeを取得
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IReadOnlyList<InkStroke> strokes = sketchBook[i].InkPresenter.StrokeContainer.GetStrokes();
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if (strokes.Count >= 0)
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{
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IRandomAccessStream fileStream = await file.OpenAsync(FileAccessMode.ReadWrite);
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//メモリに保存
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await sketchBook[i].InkPresenter.StrokeContainer.SaveAsync(memoryStream.AsOutputStream());
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//
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//メモリの位置を0にする
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//finalized with call to CompleteUpdatesAsync.
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memoryStream.Position = 0;
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f
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if (i == 0)
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{
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//Header読み込み、書き込み
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//GIF89a
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byte[] header = ReadBytes(memoryStream, 6);
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binaryWriter.Write(header);
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//
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//Logical Screen Descriptor読み込み
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-
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byte[] screenDescriptor = ReadBytes(memoryStream, 7);
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//Gif画像全体のサイズを設定
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UInt16 width, height;
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width = (UInt16)sketchBook[i].ActualWidth;
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height = (UInt16)sketchBook[i].ActualHeight;
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byte[] widthBytes = BitConverter.GetBytes(width);
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byte[] heightBytes = BitConverter.GetBytes(height);
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screenDescriptor[0] = widthBytes[0];
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screenDescriptor[1] = widthBytes[1];
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screenDescriptor[2] = heightBytes[0];
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screenDescriptor[3] = heightBytes[1];
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//背景色
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screenDescriptor[5] = 0xFF;
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//Global Color Tableがあるか
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if (s
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if ((screenDescriptor[4] & 0x80) != 0)
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{
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//メモリに保存
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await sketchBook[i].InkPresenter.StrokeContainer.SaveAsync(memoryStream.AsOutputStream());
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//メモリの位置を0にする
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memoryStream.Position = 0;
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if (i == 0)
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{
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-
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//Header読み込み、書き込み
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//GIF89a
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byte[] header = ReadBytes(memoryStream, 6);
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binaryWriter.Write(header);
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//Logical Screen Descriptor読み込み
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byte[] screenDescriptor = ReadBytes(memoryStream, 7);
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//Gif画像全体のサイズを設定
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UInt16 width, height;
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width = (UInt16)sketchBook[i].ActualWidth;
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height = (UInt16)sketchBook[i].ActualHeight;
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byte[] widthBytes = BitConverter.GetBytes(width);
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byte[] heightBytes = BitConverter.GetBytes(height);
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screenDescriptor[0] = widthBytes[0];
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screenDescriptor[1] = widthBytes[1];
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screenDescriptor[2] = heightBytes[0];
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screenDescriptor[3] = heightBytes[1];
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//背景色
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screenDescriptor[5] = 0xFF;
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//Global Color Tableがあるか
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if ((screenDescriptor[4] & 0x80) != 0)
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{
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//Color Tableのサイズを取得
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colorTableSize = screenDescriptor[4] & 0x07;
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hasGlobalColorTable = true;
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}
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else
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{
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hasGlobalColorTable = false;
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}
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//Global Color Tableを使わない
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//広域配色表フラグと広域配色表の寸法を消す
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screenDescriptor[4] = (byte)(screenDescriptor[4] & 0x78);
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//Logical Screen Descriptor書き込み
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binaryWriter.Write(screenDescriptor);
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//Application Extensionを追加
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binaryWriter.Write(GetApplicationExtension(0));
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}
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else
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{
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//HeaderとLogical Screen Descriptorをスキップ
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memoryStream.Position = 6 + 7;
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}
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//Graphics Control Extension読み込み、書き込み
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byte[] graphicsControlExtension = ReadBytes(memoryStream, 8);
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binaryWriter.Write(GetGraphicControlExtension(delayTime));
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byte[] colorTable = null;
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if (hasGlobalColorTable)
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-
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{
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-
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//Color Tableを取得、3はRGB
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colorTable = ReadBytes(memoryStream, (int)Math.Pow(2, colorTableSize + 1) * 3);
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-
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}
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-
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//Image Descriptor読み込み
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-
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byte[] imageDescriptor = ReadBytes(memoryStream, 10);
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-
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198
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-
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//位置の設定
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-
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byte[] xBytes = BitConverter.GetBytes((UInt16)sketchBook[i].InkPresenter.StrokeContainer.BoundingRect.X);
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202
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-
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203
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byte[] yBytes = BitConverter.GetBytes((UInt16)sketchBook[i].InkPresenter.StrokeContainer.BoundingRect.Y);
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imageDescriptor[1] = xBytes[0];
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imageDescriptor[2] = xBytes[1];
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imageDescriptor[3] = yBytes[0];
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imageDescriptor[4] = yBytes[1];
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if (!hasGlobalColorTable)
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-
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{
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-
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//Local Color Tableを持っているか
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-
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if ((imageDescriptor[9] & 0x80) == 0)
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throw new Exception("Not found local color table.");
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224
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-
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225
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226
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227
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//Color Tableのサイズを取得
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228
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-
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229
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colorTableSize = imageDescriptor[9] & 7;
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230
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-
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231
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232
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233
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//Color Tableを取得
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234
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-
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235
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colorTable = ReadBytes(memoryStream, (int)Math.Pow(2, colorTableSize + 1) * 3);
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236
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-
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237
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}
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238
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-
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239
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-
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240
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-
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241
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//狭域配色表フラグ (Local Color Table Flag)と狭域配色表の寸法を追加
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242
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-
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243
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imageDescriptor[9] = (byte)(imageDescriptor[9] | 0x80 | colorTableSize);
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244
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-
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245
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-
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246
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-
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247
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//Image Descriptor書き込み
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248
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-
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249
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binaryWriter.Write(imageDescriptor);
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250
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-
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251
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-
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252
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-
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253
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//Local Color Table書き込み
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254
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255
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binaryWriter.Write(colorTable);
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256
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-
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257
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-
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258
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259
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//Image Data読み込み、書き込み(終了部0x3Bは書き込まない)
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260
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-
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261
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byte[] imageDataBytes = ReadBytes(memoryStream, (int)(memoryStream.Length - memoryStream.Position - 1));
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262
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-
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263
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binaryWriter.Write(imageDataBytes);
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264
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-
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265
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266
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267
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//0x3Bを読み飛ばし
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268
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-
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269
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-
byte[] end = ReadBytes(memoryStream, 1);
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270
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-
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271
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-
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272
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-
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273
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-
if (i == sketchBook.Count - 1)
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274
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-
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275
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{
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276
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-
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277
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//終了部(Trailer)書き込み
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278
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-
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279
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-
binaryWriter.Write((byte)0x3B);
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280
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-
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281
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-
}
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282
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-
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283
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-
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284
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-
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285
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-
//MemoryStreamをリセット
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286
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-
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287
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-
memoryStream.SetLength(0);
|
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288
124
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289
125
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}
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|
290
126
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127
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+
else
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128
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+
|
|
129
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+
{
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130
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+
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131
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+
hasGlobalColorTable = false;
|
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132
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+
|
|
133
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+
}
|
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134
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+
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135
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+
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136
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+
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137
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+
//Global Color Tableを使わない
|
|
138
|
+
|
|
139
|
+
//広域配色表フラグと広域配色表の寸法を消す
|
|
140
|
+
|
|
141
|
+
screenDescriptor[4] = (byte)(screenDescriptor[4] & 0x78);
|
|
142
|
+
|
|
143
|
+
|
|
144
|
+
|
|
145
|
+
//Logical Screen Descriptor書き込み
|
|
146
|
+
|
|
147
|
+
binaryWriter.Write(screenDescriptor);
|
|
148
|
+
|
|
149
|
+
|
|
150
|
+
|
|
151
|
+
//Application Extensionを追加
|
|
152
|
+
|
|
153
|
+
binaryWriter.Write(GetApplicationExtension(0));
|
|
154
|
+
|
|
291
155
|
}
|
|
292
156
|
|
|
293
|
-
|
|
294
|
-
|
|
295
|
-
//指定したファイルの更新を開始
|
|
296
|
-
|
|
297
|
-
//Finalize write so other apps can update file.
|
|
298
|
-
|
|
299
|
-
Windows.Storage.Provider.FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
|
|
300
|
-
|
|
301
|
-
|
|
302
|
-
|
|
303
|
-
|
|
157
|
+
else
|
|
304
|
-
|
|
305
|
-
if (status == Windows.Storage.Provider.FileUpdateStatus.Complete)
|
|
306
158
|
|
|
307
159
|
{
|
|
308
160
|
|
|
161
|
+
//HeaderとLogical Screen Descriptorをスキップ
|
|
162
|
+
|
|
163
|
+
memoryStream.Position = 6 + 7;
|
|
164
|
+
|
|
309
165
|
}
|
|
310
166
|
|
|
167
|
+
|
|
168
|
+
|
|
311
|
-
//
|
|
169
|
+
//Graphics Control Extension読み込み、書き込み
|
|
170
|
+
|
|
312
|
-
|
|
171
|
+
byte[] graphicsControlExtension = ReadBytes(memoryStream, 8);
|
|
172
|
+
|
|
173
|
+
binaryWriter.Write(GetGraphicControlExtension(delayTime));
|
|
174
|
+
|
|
175
|
+
|
|
176
|
+
|
|
313
|
-
el
|
|
177
|
+
byte[] colorTable = null;
|
|
178
|
+
|
|
179
|
+
if (hasGlobalColorTable)
|
|
314
180
|
|
|
315
181
|
{
|
|
316
182
|
|
|
183
|
+
//Color Tableを取得、3はRGB
|
|
184
|
+
|
|
185
|
+
colorTable = ReadBytes(memoryStream, (int)Math.Pow(2, colorTableSize + 1) * 3);
|
|
186
|
+
|
|
317
187
|
}
|
|
318
188
|
|
|
319
189
|
|
|
320
190
|
|
|
191
|
+
//Image Descriptor読み込み
|
|
192
|
+
|
|
193
|
+
byte[] imageDescriptor = ReadBytes(memoryStream, 10);
|
|
194
|
+
|
|
195
|
+
|
|
196
|
+
|
|
197
|
+
//位置の設定
|
|
198
|
+
|
|
199
|
+
byte[] xBytes = BitConverter.GetBytes((UInt16)sketchBook[i].InkPresenter.StrokeContainer.BoundingRect.X);
|
|
200
|
+
|
|
201
|
+
byte[] yBytes = BitConverter.GetBytes((UInt16)sketchBook[i].InkPresenter.StrokeContainer.BoundingRect.Y);
|
|
202
|
+
|
|
203
|
+
imageDescriptor[1] = xBytes[0];
|
|
204
|
+
|
|
205
|
+
imageDescriptor[2] = xBytes[1];
|
|
206
|
+
|
|
207
|
+
imageDescriptor[3] = yBytes[0];
|
|
208
|
+
|
|
209
|
+
imageDescriptor[4] = yBytes[1];
|
|
210
|
+
|
|
211
|
+
|
|
212
|
+
|
|
213
|
+
if (!hasGlobalColorTable)
|
|
214
|
+
|
|
215
|
+
{
|
|
216
|
+
|
|
217
|
+
//Local Color Tableを持っているか
|
|
218
|
+
|
|
219
|
+
if ((imageDescriptor[9] & 0x80) == 0)
|
|
220
|
+
|
|
221
|
+
throw new Exception("Not found local color table.");
|
|
222
|
+
|
|
223
|
+
|
|
224
|
+
|
|
225
|
+
//Color Tableのサイズを取得
|
|
226
|
+
|
|
227
|
+
colorTableSize = imageDescriptor[9] & 7;
|
|
228
|
+
|
|
229
|
+
|
|
230
|
+
|
|
231
|
+
//Color Tableを取得
|
|
232
|
+
|
|
233
|
+
colorTable = ReadBytes(memoryStream, (int)Math.Pow(2, colorTableSize + 1) * 3);
|
|
234
|
+
|
|
235
|
+
}
|
|
236
|
+
|
|
237
|
+
|
|
238
|
+
|
|
239
|
+
//狭域配色表フラグ (Local Color Table Flag)と狭域配色表の寸法を追加
|
|
240
|
+
|
|
241
|
+
imageDescriptor[9] = (byte)(imageDescriptor[9] | 0x80 | colorTableSize);
|
|
242
|
+
|
|
243
|
+
|
|
244
|
+
|
|
245
|
+
//Image Descriptor書き込み
|
|
246
|
+
|
|
321
|
-
a
|
|
247
|
+
binaryWriter.Write(imageDescriptor);
|
|
248
|
+
|
|
249
|
+
|
|
250
|
+
|
|
322
|
-
|
|
251
|
+
//Local Color Table書き込み
|
|
252
|
+
|
|
323
|
-
|
|
253
|
+
binaryWriter.Write(colorTable);
|
|
254
|
+
|
|
255
|
+
|
|
256
|
+
|
|
324
|
-
|
|
257
|
+
//Image Data読み込み、書き込み(終了部0x3Bは書き込まない)
|
|
258
|
+
|
|
259
|
+
byte[] imageDataBytes = ReadBytes(memoryStream, (int)(memoryStream.Length - memoryStream.Position - 1));
|
|
260
|
+
|
|
325
|
-
a
|
|
261
|
+
binaryWriter.Write(imageDataBytes);
|
|
262
|
+
|
|
263
|
+
|
|
264
|
+
|
|
326
|
-
|
|
265
|
+
//0x3Bを読み飛ばし
|
|
266
|
+
|
|
327
|
-
|
|
267
|
+
byte[] end = ReadBytes(memoryStream, 1);
|
|
268
|
+
|
|
269
|
+
|
|
270
|
+
|
|
328
|
-
|
|
271
|
+
if (i == sketchBook.Count - 1)
|
|
272
|
+
|
|
273
|
+
{
|
|
274
|
+
|
|
275
|
+
//終了部(Trailer)書き込み
|
|
276
|
+
|
|
277
|
+
binaryWriter.Write((byte)0x3B);
|
|
278
|
+
|
|
279
|
+
}
|
|
280
|
+
|
|
281
|
+
|
|
282
|
+
|
|
283
|
+
//MemoryStreamをリセット
|
|
284
|
+
|
|
329
|
-
memoryStream.
|
|
285
|
+
memoryStream.SetLength(0);
|
|
330
|
-
|
|
331
|
-
|
|
332
|
-
|
|
333
|
-
binaryWriter.Dispose();
|
|
334
|
-
|
|
335
|
-
|
|
336
|
-
|
|
337
|
-
fileStream.Dispose();
|
|
338
286
|
|
|
339
287
|
}
|
|
340
288
|
|
|
289
|
+
}
|
|
290
|
+
|
|
291
|
+
|
|
292
|
+
|
|
293
|
+
//指定したファイルの更新を開始
|
|
294
|
+
|
|
295
|
+
//Finalize write so other apps can update file.
|
|
296
|
+
|
|
297
|
+
Windows.Storage.Provider.FileUpdateStatus status = await CachedFileManager.CompleteUpdatesAsync(file);
|
|
298
|
+
|
|
299
|
+
|
|
300
|
+
|
|
301
|
+
//ファイルが保存されたとき
|
|
302
|
+
|
|
303
|
+
if (status == Windows.Storage.Provider.FileUpdateStatus.Complete)
|
|
304
|
+
|
|
305
|
+
{
|
|
306
|
+
|
|
307
|
+
}
|
|
308
|
+
|
|
309
|
+
//ファイルが正常に保存されなかったとき
|
|
310
|
+
|
|
311
|
+
else
|
|
312
|
+
|
|
313
|
+
{
|
|
314
|
+
|
|
315
|
+
}
|
|
316
|
+
|
|
317
|
+
|
|
318
|
+
|
|
319
|
+
await memoryStream.FlushAsync();
|
|
320
|
+
|
|
321
|
+
|
|
322
|
+
|
|
323
|
+
await fileStream.FlushAsync();
|
|
324
|
+
|
|
325
|
+
|
|
326
|
+
|
|
327
|
+
memoryStream.Dispose();
|
|
328
|
+
|
|
329
|
+
|
|
330
|
+
|
|
331
|
+
binaryWriter.Dispose();
|
|
332
|
+
|
|
333
|
+
|
|
334
|
+
|
|
335
|
+
fileStream.Dispose();
|
|
336
|
+
|
|
337
|
+
}
|
|
338
|
+
|
|
339
|
+
|
|
340
|
+
|
|
341
|
+
//MemoryStreamの現在の位置から指定されたサイズのバイト配列を読み込む
|
|
342
|
+
|
|
343
|
+
//memoryStream : 読み取るMemoryStream
|
|
344
|
+
|
|
345
|
+
//count : 読み取るバイトのサイズ
|
|
346
|
+
|
|
347
|
+
//戻り値 : 読み取れたバイト配列
|
|
348
|
+
|
|
349
|
+
static byte[] ReadBytes(MemoryStream memoryStream, int count)
|
|
350
|
+
|
|
351
|
+
{
|
|
352
|
+
|
|
353
|
+
byte[] bytes = new byte[count];
|
|
354
|
+
|
|
355
|
+
memoryStream.Read(bytes, 0, count);
|
|
356
|
+
|
|
357
|
+
return bytes;
|
|
358
|
+
|
|
359
|
+
}
|
|
360
|
+
|
|
361
|
+
|
|
362
|
+
|
|
363
|
+
//Netscape Application Extensionブロックを返す
|
|
364
|
+
|
|
365
|
+
//loopCount : 繰り返す回数、0で無限
|
|
366
|
+
|
|
367
|
+
//戻り値 : Netscape Application Extensionブロックのbyte配列
|
|
368
|
+
|
|
369
|
+
static byte[] GetApplicationExtension(UInt16 loopCount)
|
|
370
|
+
|
|
371
|
+
{
|
|
372
|
+
|
|
373
|
+
byte[] block = new byte[19];
|
|
374
|
+
|
|
375
|
+
|
|
376
|
+
|
|
377
|
+
//拡張導入符(Extension Introducer)
|
|
378
|
+
|
|
379
|
+
block[0] = 0x21;
|
|
380
|
+
|
|
381
|
+
|
|
382
|
+
|
|
383
|
+
//アプリケーション拡張ラベル(Application Extension Label)
|
|
384
|
+
|
|
385
|
+
block[1] = 0xFF;
|
|
386
|
+
|
|
387
|
+
|
|
388
|
+
|
|
389
|
+
//ブロック寸法(Block Size)
|
|
390
|
+
|
|
391
|
+
block[2] = 0x0B;
|
|
392
|
+
|
|
393
|
+
|
|
394
|
+
|
|
395
|
+
//アプリケーション識別名(Application Identifier)
|
|
396
|
+
|
|
397
|
+
block[3] = (byte)'N';
|
|
398
|
+
|
|
399
|
+
block[4] = (byte)'E';
|
|
400
|
+
|
|
401
|
+
block[5] = (byte)'T';
|
|
402
|
+
|
|
403
|
+
block[6] = (byte)'S';
|
|
404
|
+
|
|
405
|
+
block[7] = (byte)'C';
|
|
406
|
+
|
|
407
|
+
block[8] = (byte)'A';
|
|
408
|
+
|
|
409
|
+
block[9] = (byte)'P';
|
|
410
|
+
|
|
411
|
+
block[10] = (byte)'E';
|
|
412
|
+
|
|
413
|
+
|
|
414
|
+
|
|
415
|
+
//アプリケーション確証符号(Application Authentication Code)
|
|
416
|
+
|
|
417
|
+
block[11] = (byte)'2';
|
|
418
|
+
|
|
419
|
+
block[12] = (byte)'.';
|
|
420
|
+
|
|
421
|
+
block[13] = (byte)'0';
|
|
422
|
+
|
|
423
|
+
|
|
424
|
+
|
|
425
|
+
//データ副ブロック寸法(Data Sub-block Size)
|
|
426
|
+
|
|
427
|
+
block[14] = 0x03;
|
|
428
|
+
|
|
429
|
+
|
|
430
|
+
|
|
431
|
+
//詰め込み欄[ネットスケープ拡張コード(Netscape Extension Code)]
|
|
432
|
+
|
|
433
|
+
block[15] = 0x01;
|
|
434
|
+
|
|
435
|
+
|
|
436
|
+
|
|
437
|
+
//繰り返し回数(Loop Count)
|
|
438
|
+
|
|
439
|
+
byte[] loopCountBytes = BitConverter.GetBytes(loopCount);
|
|
440
|
+
|
|
441
|
+
block[16] = loopCountBytes[0];
|
|
442
|
+
|
|
443
|
+
block[17] = loopCountBytes[1];
|
|
444
|
+
|
|
445
|
+
|
|
446
|
+
|
|
447
|
+
//ブロック終了符(Block Terminator)
|
|
448
|
+
|
|
449
|
+
block[18] = (byte)0x00;
|
|
450
|
+
|
|
451
|
+
|
|
452
|
+
|
|
453
|
+
return block;
|
|
454
|
+
|
|
455
|
+
}
|
|
456
|
+
|
|
457
|
+
|
|
458
|
+
|
|
459
|
+
//Graphic Control Extensionブロックを返す
|
|
460
|
+
|
|
461
|
+
//delayTime : 遅延時間(100分の1秒単位)
|
|
462
|
+
|
|
463
|
+
//戻り値 : Graphic Control Extensionブロックのbyte配列
|
|
464
|
+
|
|
465
|
+
static byte[] GetGraphicControlExtension(UInt16 delayTime)
|
|
466
|
+
|
|
467
|
+
{
|
|
468
|
+
|
|
469
|
+
byte[] block = new byte[8];
|
|
470
|
+
|
|
471
|
+
|
|
472
|
+
|
|
473
|
+
//拡張導入符(Extension Introducer)
|
|
474
|
+
|
|
475
|
+
block[0] = 0x21;
|
|
476
|
+
|
|
477
|
+
|
|
478
|
+
|
|
479
|
+
//グラフィック制御ラベル(Graphic Control Label)
|
|
480
|
+
|
|
481
|
+
block[1] = 0xF9;
|
|
482
|
+
|
|
483
|
+
|
|
484
|
+
|
|
485
|
+
//ブロック寸法(Block Size, Byte Size)
|
|
486
|
+
|
|
487
|
+
block[2] = 0x04;
|
|
488
|
+
|
|
489
|
+
|
|
490
|
+
|
|
491
|
+
//詰め込み欄(Packed Field)
|
|
492
|
+
|
|
493
|
+
//透過色指標を使う時は+1
|
|
494
|
+
|
|
495
|
+
//消去方法 : そのまま残す+4、背景色でつぶす+8、直前の画像に戻す+12
|
|
496
|
+
|
|
497
|
+
block[3] = 0x00 + 8;
|
|
498
|
+
|
|
499
|
+
|
|
500
|
+
|
|
501
|
+
//遅延時間(Delay Time)
|
|
502
|
+
|
|
503
|
+
byte[] delayTimeBytes = BitConverter.GetBytes(delayTime);
|
|
504
|
+
|
|
505
|
+
block[4] = delayTimeBytes[0];
|
|
506
|
+
|
|
507
|
+
block[5] = delayTimeBytes[1];
|
|
508
|
+
|
|
509
|
+
|
|
510
|
+
|
|
511
|
+
//透過色指標 (Transparency Index, Transparent Color Index)
|
|
512
|
+
|
|
513
|
+
block[6] = 0xFF;
|
|
514
|
+
|
|
515
|
+
|
|
516
|
+
|
|
517
|
+
//ブロック終了符 (Block Terminator)
|
|
518
|
+
|
|
519
|
+
block[7] = 0x00;
|
|
520
|
+
|
|
521
|
+
|
|
522
|
+
|
|
523
|
+
return block;
|
|
524
|
+
|
|
525
|
+
}
|
|
526
|
+
|
|
341
527
|
```
|