context
magick::estimate (const context& ctx)
{
double x_sample_factor = x_resolution_ / ctx.x_resolution ();
double y_sample_factor = y_resolution_ / ctx.y_resolution ();
context rv (ctx);
rv.width (ctx.width () * x_sample_factor);
rv.height (ctx.height () * y_sample_factor);
rv.resolution (x_resolution_, y_resolution_);
if (force_extent_)
{
rv.width (width_ * x_resolution_);
rv.height (height_ * y_resolution_);
}
if (image_format_)
{
/**/ if (image_format_ == "GIF" ) rv.content_type ("image/gif");
else if (image_format_ == "JPEG") rv.content_type ("image/jpeg");
else if (image_format_ == "PDF")
{
rv.content_type (bilevel_
? "image/x-portable-bitmap"
: "image/jpeg");
}
else if (image_format_ == "PNG" ) rv.content_type ("image/png");
else if (image_format_ == "PNM" )
{
rv.content_type ("image/x-portable-anymap");
}
else if (image_format_ == "TIFF") rv.content_type ("image/x-raster");
else
{
// internal error
}
}
else
{
rv.content_type ("image/x-raster");
}
if (bilevel_)
{
rv.depth (1);
}
return rv;
}
void
padding::eoi (const context& ctx)
{
context::size_type padding;
if (ctx_.width () >= ctx.width ())
{
padding = ctx_.scan_width () - ctx.scan_width ();
if (padding)
log::alert ("%1% padding octets remain") % padding;
ctx_.width (ctx.width (), padding);
}
else
{
log::alert
("%1% pixels inadvertently cropped when removing padding octets")
% (ctx.width () - ctx_.width ());
}
if (ctx_.height () >= ctx.height ())
{
padding = ctx_.scan_height () - ctx.scan_height ();
if (padding)
log::alert ("%1% padding scan lines remain") % padding;
ctx_.height (ctx.height (), padding);
}
else
{
log::alert
("%1% pixels inadvertently cropped when removing padding lines")
% (ctx.height () - ctx_.height ());
}
}
void
padding::boi (const context& ctx)
{
logic_error e
(_("padding only works with raster images of known size"));
if (!ctx.is_raster_image ())
BOOST_THROW_EXCEPTION (e);
if (0 != ctx.padding_octets ()
&& context::unknown_size == ctx.width ())
BOOST_THROW_EXCEPTION (e);
if (0 != ctx.padding_lines ()
&& context::unknown_size == ctx.height ())
BOOST_THROW_EXCEPTION (e);
w_padding_ = ctx.padding_octets ();
h_padding_ = ctx.padding_lines ();
scan_line_count_ = 0;
skip_ = 0;
ctx_ = ctx;
ctx_.width (ctx.width (), 0); // zap our padding settings
ctx_.height (ctx.height (), 0);
}
std::string
magick::arguments (const context& ctx)
{
using std::string;
string argv;
// Set up input data characteristics
argv += " -size " + geom_(ctx.width (), ctx.height ());
argv += " -depth " + lexical_cast< string > (ctx.depth ());
argv += " -density " + geom_(ctx.x_resolution (), ctx.y_resolution ());
argv += " -units PixelsPerInch";
if (ctx.is_raster_image ())
{
/**/ if (ctx.is_rgb ()) argv += " rgb:-";
else if (1 != ctx.depth ()) argv += " gray:-";
else argv += " mono:-";
}
else
argv += " -";
// Pass output resolutions so they can be embedded where supported
// by the data format.
argv += " -density " + geom_(ctx_.x_resolution (), ctx_.y_resolution ());
// Specify the "resampling" algorithm and parameters, if necessary.
if ( x_resolution_ != ctx.x_resolution ()
|| y_resolution_ != ctx.y_resolution ())
{
double x_sample_factor = x_resolution_ / ctx.x_resolution ();
double y_sample_factor = y_resolution_ / ctx.y_resolution ();
argv += " -scale " + geom_(ctx.width () * x_sample_factor,
ctx.height () * y_sample_factor) + "!";
}
if (force_extent_)
argv += " -extent " + geom_(width_ * x_resolution_,
height_ * y_resolution_);
if (color_correction_)
{
if (HAVE_IMAGE_MAGICK
&& !image_magick_version_before_("6.6.1-0"))
argv += " -color-matrix";
else
argv += " -recolor";
argv += " \"";
for (size_t i = 0; i < sizeof (cct_) / sizeof (*cct_); ++i)
argv += lexical_cast< string > (cct_[i]) + " ";
argv += "\"";
}
if (bilevel_)
{
// Thresholding an already thresholded image should be safe
argv += " -threshold " + lexical_cast< string > (threshold_) + "%";
if (image_format_ == "PNG")
{
argv += " -monochrome";
}
else
{
argv += " -type bilevel";
}
}
// Prevent GraphicsMagick from converting gray JPEG images to RGB
if (HAVE_GRAPHICS_MAGICK && !ctx.is_rgb ())
argv += " -colorspace gray";
if (image_format_)
{
/**/ if (image_format_ == "GIF" ) argv += " gif:-";
else if (image_format_ == "JPEG") argv += " jpeg:-";
else if (image_format_ == "PDF" )
{
if (!bilevel_) argv += " jpeg:-";
else argv += " pbm:-";
}
else if (image_format_ == "PNG" ) argv += " png:-";
else if (image_format_ == "PNM" ) argv += " pnm:-";
else if (image_format_ == "TIFF")
{
argv += " -depth " + lexical_cast< string > (ctx_.depth ());
/**/ if (ctx_.is_rgb ())
argv += " rgb:-";
else
{
if (HAVE_GRAPHICS_MAGICK
&& bilevel_)
argv += " mono:-";
else
argv += " gray:-";
}
}
else
{
argv += " -";
}
}
else
{
argv += " -depth " + lexical_cast< string > (ctx_.depth ());
/**/ if (ctx_.is_rgb ())
argv += " rgb:-";
else
{
if (HAVE_GRAPHICS_MAGICK
&& bilevel_)
argv += " mono:-";
else
argv += " gray:-";
}
}
return argv;
}
