/**
* PDF images are handles as inline, not XObject streams...
*/
void PDF_PLOTTER::PlotImage( const wxImage & aImage, const wxPoint& aPos,
double aScaleFactor )
{
wxASSERT( workFile );
wxSize pix_size( aImage.GetWidth(), aImage.GetHeight() );
// Requested size (in IUs)
DPOINT drawsize( aScaleFactor * pix_size.x,
aScaleFactor * pix_size.y );
// calculate the bitmap start position
wxPoint start( aPos.x - drawsize.x / 2,
aPos.y + drawsize.y / 2);
DPOINT dev_start = userToDeviceCoordinates( start );
/* PDF has an uhm... simplified coordinate system handling. There is
*one* operator to do everything (the PS concat equivalent). At least
they kept the matrix stack to save restore environments. Also images
are always emitted at the origin with a size of 1x1 user units.
What we need to do is:
1) save the CTM end estabilish the new one
2) plot the image
3) restore the CTM
4) profit
*/
fprintf( workFile, "q %g 0 0 %g %g %g cm\n", // Step 1
userToDeviceSize( drawsize.x ),
userToDeviceSize( drawsize.y ),
dev_start.x, dev_start.y );
/* An inline image is a cross between a dictionary and a stream.
A real ugly construct (compared with the elegance of the PDF
format). Also it accepts some 'abbreviations', which is stupid
since the content stream is usually compressed anyway... */
fprintf( workFile,
"BI\n"
" /BPC 8\n"
" /CS %s\n"
" /W %d\n"
" /H %d\n"
"ID\n", colorMode ? "/RGB" : "/G", pix_size.x, pix_size.y );
/* Here comes the stream (in binary!). I *could* have hex or ascii84
encoded it, but who cares? I'll go through zlib anyway */
for( int y = 0; y < pix_size.y; y++ )
{
for( int x = 0; x < pix_size.x; x++ )
{
unsigned char r = aImage.GetRed( x, y ) & 0xFF;
unsigned char g = aImage.GetGreen( x, y ) & 0xFF;
unsigned char b = aImage.GetBlue( x, y ) & 0xFF;
// As usual these days, stdio buffering has to suffeeeeerrrr
if( colorMode )
{
putc( r, workFile );
putc( g, workFile );
putc( b, workFile );
}
else
{
// Grayscale conversion
putc( (r + g + b) / 3, workFile );
}
}
}
fputs( "EI Q\n", workFile ); // Finish step 2 and do step 3
}
/**
* Postscript-likes at the moment are the only plot engines supporting bitmaps...
*/
void PS_PLOTTER::PlotImage( const wxImage & aImage, const wxPoint& aPos,
double aScaleFactor )
{
wxSize pix_size; // size of the bitmap in pixels
pix_size.x = aImage.GetWidth();
pix_size.y = aImage.GetHeight();
DPOINT drawsize( aScaleFactor * pix_size.x,
aScaleFactor * pix_size.y ); // requested size of image
// calculate the bottom left corner position of bitmap
wxPoint start = aPos;
start.x -= drawsize.x / 2; // left
start.y += drawsize.y / 2; // bottom (Y axis reversed)
// calculate the top right corner position of bitmap
wxPoint end;
end.x = start.x + drawsize.x;
end.y = start.y - drawsize.y;
fprintf( outputFile, "/origstate save def\n" );
fprintf( outputFile, "/pix %d string def\n", pix_size.x );
// Locate lower-left corner of image
DPOINT start_dev = userToDeviceCoordinates( start );
fprintf( outputFile, "%g %g translate\n", start_dev.x, start_dev.y );
// Map image size to device
DPOINT end_dev = userToDeviceCoordinates( end );
fprintf( outputFile, "%g %g scale\n",
std::abs(end_dev.x - start_dev.x), std::abs(end_dev.y - start_dev.y));
// Dimensions of source image (in pixels
fprintf( outputFile, "%d %d 8", pix_size.x, pix_size.y );
// Map unit square to source
fprintf( outputFile, " [%d 0 0 %d 0 %d]\n", pix_size.x, -pix_size.y , pix_size.y);
// include image data in ps file
fprintf( outputFile, "{currentfile pix readhexstring pop}\n" );
if( colorMode )
fputs( "false 3 colorimage\n", outputFile );
else
fputs( "image\n", outputFile );
// Single data source, 3 colors, Output RGB data (hexadecimal)
// (or the same downscaled to gray)
int jj = 0;
for( int yy = 0; yy < pix_size.y; yy ++ )
{
for( int xx = 0; xx < pix_size.x; xx++, jj++ )
{
if( jj >= 16 )
{
jj = 0;
fprintf( outputFile, "\n");
}
int red, green, blue;
red = aImage.GetRed( xx, yy) & 0xFF;
green = aImage.GetGreen( xx, yy) & 0xFF;
blue = aImage.GetBlue( xx, yy) & 0xFF;
if( colorMode )
fprintf( outputFile, "%2.2X%2.2X%2.2X", red, green, blue );
else
fprintf( outputFile, "%2.2X", (red + green + blue) / 3 );
}
}
fprintf( outputFile, "\n");
fprintf( outputFile, "origstate restore\n" );
}
