/// <summary>
/// Convert a PDF/raster into something we can easily display with
/// native .NET stuff...
/// </summary>
/// <param name="a_szImage">file to convert</param>
/// <returns>a byte array we can turn into a bitmap</returns>
public static byte[] ConvertPdfToTiffOrJpeg(string a_szImage)
{
long lWidth;
long lHeight;
long lResolution;
byte[] abStripData;
byte[] abImage = null;
// Do the conversion...
PdfRasterReader.Reader.PdfRasterReaderPixelFormat rasterreaderpixelformat;
PdfRasterReader.Reader.PdfRasterReaderCompression rasterreadercompression;
PdfRasterReader.Reader pdfRasRd = new PdfRasterReader.Reader();
int decoder = pdfRasRd.decoder_create(PdfRasterReader.Reader.PdfRasterConst.PDFRASREAD_API_LEVEL, a_szImage);
lWidth = pdfRasRd.decoder_get_width(decoder);
lHeight = pdfRasRd.decoder_get_height(decoder);
lResolution = (long)pdfRasRd.decoder_get_yresolution(decoder);
rasterreaderpixelformat = pdfRasRd.decoder_get_pixelformat(decoder);
rasterreadercompression = pdfRasRd.decoder_get_compression(decoder);
abStripData = pdfRasRd.decoder_read_strips(decoder);
pdfRasRd.decoder_destroy(decoder);
AddImageHeader(out abImage, abStripData, rasterreaderpixelformat, rasterreadercompression, lResolution, lWidth, lHeight);
// Spit back the result...
return(abImage);
}
/// <summary>
/// Check if a file is a valid PDF/raster...
/// </summary>
/// <param name="a_szPdf">file to check</param>
/// <param name="a_szError">text if we hit an error</param>
/// <returns>true if it's a valid PDF/raster file</returns>
public static bool ValidPdfRaster(string a_szPdf, out string a_szError)
{
int iDecoder;
byte[] abStripData;
PdfRasterReader.Reader pdfRasRd;
string szFunction = "";
// Hope for the best...
a_szError = "";
// The class throws errors, so get the mitt ready...
try
{
szFunction = "new PdfRasterReader.Reader()";
pdfRasRd = new PdfRasterReader.Reader();
szFunction = "pdfRasRd.decoder_create()";
iDecoder = pdfRasRd.decoder_create(PdfRasterReader.Reader.PdfRasterConst.PDFRASREAD_API_LEVEL, a_szPdf);
szFunction = "pdfRasRd.decoder_get_compression()";
pdfRasRd.decoder_get_compression(iDecoder);
szFunction = "pdfRasRd.decoder_get_height()";
pdfRasRd.decoder_get_height(iDecoder);
szFunction = "pdfRasRd.decoder_get_page_count()";
pdfRasRd.decoder_get_page_count(iDecoder);
szFunction = "pdfRasRd.decoder_get_pixelformat()";
pdfRasRd.decoder_get_pixelformat(iDecoder);
szFunction = "pdfRasRd.decoder_get_width()";
pdfRasRd.decoder_get_width(iDecoder);
szFunction = "pdfRasRd.decoder_get_xresolution()";
pdfRasRd.decoder_get_xresolution(iDecoder);
szFunction = "pdfRasRd.decoder_get_yresolution()";
pdfRasRd.decoder_get_yresolution(iDecoder);
szFunction = "pdfRasRd.decoder_read_strips()";
abStripData = pdfRasRd.decoder_read_strips(iDecoder);
szFunction = "pdfRasRd.decoder_destroy()";
pdfRasRd.decoder_destroy(iDecoder);
}
catch (Exception exception)
{
a_szError = szFunction + ": " + exception.Message;
return(false);
}
// We almost made it...
if (abStripData == null)
{
a_szError = "pdfRasRd.decoder_read_strips(): error reading strip data";
return(false);
}
// Success...
return(true);
}
/// <summary>
/// Create a thumbnail from a PDF/raster file...
/// </summary>
/// <param name="a_szPdf">source</param>
/// <param name="a_szThumbnailFile">destination</param>
/// <returns>true on success</returns>
public static bool CreatePdfRasterThumbnail
(
string a_szPdf,
string a_szThumbnailFile
)
{
int hh;
int ssww;
int ddww;
bool blSuccess;
long lWidth;
long lHeight;
long lResolution;
byte[] abImage;
byte[] abStripData;
Bitmap bitmap;
BitmapData bitmapdata;
// Convert the image to a thumbnail...
PdfRasterReader.Reader.PdfRasterReaderPixelFormat rasterreaderpixelformat;
PdfRasterReader.Reader.PdfRasterReaderCompression rasterreadercompression;
PdfRasterReader.Reader pdfRasRd = new PdfRasterReader.Reader();
int decoder = pdfRasRd.decoder_create(PdfRasterReader.Reader.PdfRasterConst.PDFRASREAD_API_LEVEL, a_szPdf);
lWidth = pdfRasRd.decoder_get_width(decoder);
lHeight = pdfRasRd.decoder_get_height(decoder);
lResolution = (long)pdfRasRd.decoder_get_yresolution(decoder);
rasterreaderpixelformat = pdfRasRd.decoder_get_pixelformat(decoder);
rasterreadercompression = pdfRasRd.decoder_get_compression(decoder);
abStripData = pdfRasRd.decoder_read_strips(decoder);
pdfRasRd.decoder_destroy(decoder);
PdfRaster.AddImageHeader(out abImage, abStripData, rasterreaderpixelformat, rasterreadercompression, lResolution, lWidth, lHeight);
using (var memorystream = new MemoryStream(abImage))
{
// Get the thumbnail, fix so all thumbnails have the same height
// we'd like to preserve the aspect ratio (that's the tricky bit)...
bitmap = new Bitmap(memorystream);
Image imageThumbnail = FixedSize(bitmap, 64, 64);
bitmap = new Bitmap(imageThumbnail);
// Convert it from 32bit rgb to 24bit rgb, this is a shame, because
// it would be nice to keep an alpha channel, but so it goes...
bitmapdata = bitmap.LockBits(new Rectangle(0, 0, bitmap.Width, bitmap.Height), ImageLockMode.ReadOnly, bitmap.PixelFormat);
byte[] abImageBgr = new byte[bitmapdata.Stride * bitmap.Height];
System.Runtime.InteropServices.Marshal.Copy(bitmapdata.Scan0, abImageBgr, 0, abImageBgr.Length);
int iNewStride = (bitmapdata.Stride - (bitmapdata.Stride / 4)); // lose the A from BGRA
iNewStride = (iNewStride + 3) & ~3; // align the new stride on a 4-byte boundary
abImage = new byte[iNewStride * bitmapdata.Height];
for (hh = 0; hh < bitmapdata.Height; hh++)
{
long lSsRow = (hh * bitmapdata.Stride);
long lDdRow = (hh * iNewStride);
for (ssww = ddww = 0; ssww < bitmapdata.Stride; ddww += 3, ssww += 4)
{
abImage[lDdRow + ddww + 0] = (byte)abImageBgr[lSsRow + ssww + 2]; // R
abImage[lDdRow + ddww + 1] = (byte)abImageBgr[lSsRow + ssww + 1]; // G
abImage[lDdRow + ddww + 2] = (byte)abImageBgr[lSsRow + ssww + 0]; // B
}
}
// PDF/raster it...
blSuccess = PdfRaster.CreatePdfRaster(a_szThumbnailFile, "", abImage, 0, "rgb24", "none", (int)bitmap.HorizontalResolution, bitmap.Width, bitmap.Height);
}
// All done...
return(blSuccess);
}
