/// <summary> /// Decode caption from the input stream /// </summary> /// <returns>bitmap of the decoded caption</returns> public static Bitmap DecodeImage(PcsObject pcs, IList<OdsData> data, List<PaletteInfo> palettes) { if (pcs == null || data == null || data.Count == 0) return new Bitmap(1, 1); int w = data[0].Size.Width; int h = data[0].Size.Height; var bm = new FastBitmap(new Bitmap(w, h)); bm.LockImage(); BluRaySupPalette pal = DecodePalette(palettes); int index = 0; int ofs = 0; int xpos = 0; byte[] buf = data[0].Fragment.ImageBuffer; index = 0; do { int b = buf[index++] & 0xff; if (b == 0 && index < buf.Length) { b = buf[index++] & 0xff; if (b == 0) { // next line ofs = (ofs / w) * w; if (xpos < w) ofs += w; xpos = 0; } else { int size; if ((b & 0xC0) == 0x40) { if (index < buf.Length) { // 00 4x xx -> xxx zeroes size = ((b - 0x40) << 8) + (buf[index++] & 0xff); Color c = Color.FromArgb(pal.GetArgb(0)); for (int i = 0; i < size; i++) PutPixel(bm, ofs++, c); xpos += size; } } else if ((b & 0xC0) == 0x80) { if (index < buf.Length) { // 00 8x yy -> x times value y size = (b - 0x80); b = buf[index++] & 0xff; Color c = Color.FromArgb(pal.GetArgb(b)); for (int i = 0; i < size; i++) PutPixel(bm, ofs++, c); xpos += size; } } else if ((b & 0xC0) != 0) { if (index < buf.Length) { // 00 cx yy zz -> xyy times value z size = ((b - 0xC0) << 8) + (buf[index++] & 0xff); b = buf[index++] & 0xff; Color c = Color.FromArgb(pal.GetArgb(b)); for (int i = 0; i < size; i++) PutPixel(bm, ofs++, c); xpos += size; } } else { // 00 xx -> xx times 0 Color c = Color.FromArgb(pal.GetArgb(0)); for (int i = 0; i < b; i++) PutPixel(bm, ofs++, c); xpos += b; } } } else { PutPixel(bm, ofs++, b, pal); xpos++; } } while (index < buf.Length); bm.UnlockImage(); return bm.GetBitmap(); }
private static Bitmap CropBitmapAndUnlok(FastBitmap bmp, Color backgroundColor) { int y = 0; int x; Color c = backgroundColor; int backgroundArgb = backgroundColor.ToArgb(); // Crop top while (y < bmp.Height && IsBackgroundColor(c, backgroundArgb)) { c = bmp.GetPixel(0, y); if (IsBackgroundColor(c, backgroundArgb)) { for (x = 1; x < bmp.Width; x++) { c = bmp.GetPixelNext(); if (c.A != 0 && c.ToArgb() != backgroundArgb) break; } } if (IsBackgroundColor(c, backgroundArgb)) y++; } int minY = y; if (minY > 3) minY -= 3; else minY = 0; // Crop left x = 0; c = backgroundColor; while (x < bmp.Width && IsBackgroundColor(c, backgroundArgb)) { for (y = minY; y < bmp.Height; y++) { c = bmp.GetPixel(x, y); if (!IsBackgroundColor(c, backgroundArgb)) break; } if (IsBackgroundColor(c, backgroundArgb)) x++; } int minX = x; if (minX > 3) minX -= 3; else minX -= 0; // Crop bottom y = bmp.Height - 1; c = backgroundColor; while (y > minY && IsBackgroundColor(c, backgroundArgb)) { c = bmp.GetPixel(0, y); if (IsBackgroundColor(c, backgroundArgb)) { for (x = 1; x < bmp.Width; x++) { c = bmp.GetPixelNext(); if (!IsBackgroundColor(c, backgroundArgb)) break; } } if (IsBackgroundColor(c, backgroundArgb)) y--; } int maxY = y + 7; if (maxY >= bmp.Height) maxY = bmp.Height - 1; // Crop right x = bmp.Width - 1; c = backgroundColor; while (x > minX && IsBackgroundColor(c, backgroundArgb)) { for (y = minY; y < bmp.Height; y++) { c = bmp.GetPixel(x, y); if (!IsBackgroundColor(c, backgroundArgb)) break; } if (IsBackgroundColor(c, backgroundArgb)) x--; } int maxX = x + 7; if (maxX >= bmp.Width) maxX = bmp.Width - 1; bmp.UnlockImage(); Bitmap bmpImage = bmp.GetBitmap(); if (bmpImage.Width > 1 && bmpImage.Height > 1 && maxX - minX > 0 && maxY - minY > 0) { Bitmap bmpCrop = bmpImage.Clone(new Rectangle(minX, minY, maxX - minX, maxY - minY), bmpImage.PixelFormat); return bmpCrop; } return (Bitmap)bmpImage.Clone(); }