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image_util.cpp
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image_util.cpp
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/*****************************************************************************
*
* This file is part of Mapnik (c++ mapping toolkit)
*
* Copyright (C) 2015 Artem Pavlenko
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
*****************************************************************************/
// mapnik
#include <mapnik/image_util.hpp>
#include <mapnik/image_util_jpeg.hpp>
#include <mapnik/image_util_png.hpp>
#include <mapnik/image_util_tiff.hpp>
#include <mapnik/image_util_webp.hpp>
#include <mapnik/image.hpp>
#include <mapnik/image_any.hpp>
#include <mapnik/image_view_any.hpp>
#include <mapnik/image_view.hpp>
#include <mapnik/palette.hpp>
#include <mapnik/color.hpp>
#include <mapnik/box2d.hpp>
#include <mapnik/util/variant.hpp>
#include <mapnik/debug.hpp>
#include <mapnik/safe_cast.hpp>
#ifdef SSE_MATH
#include <mapnik/sse.hpp>
#endif
// agg
#include "agg_rendering_buffer.h"
#include "agg_pixfmt_rgba.h"
#include "agg_color_rgba.h"
// stl
#include <string>
#include <fstream>
#include <sstream>
#include <algorithm>
namespace mapnik
{
template <typename T>
MAPNIK_DECL std::string save_to_string(T const& image,
std::string const& type,
rgba_palette const& palette)
{
std::ostringstream ss(std::ios::out|std::ios::binary);
save_to_stream(image, ss, type, palette);
return ss.str();
}
template <typename T>
MAPNIK_DECL std::string save_to_string(T const& image,
std::string const& type)
{
std::ostringstream ss(std::ios::out|std::ios::binary);
save_to_stream(image, ss, type);
return ss.str();
}
template <typename T>
MAPNIK_DECL void save_to_file(T const& image,
std::string const& filename,
std::string const& type,
rgba_palette const& palette)
{
std::ofstream file (filename.c_str(), std::ios::out| std::ios::trunc|std::ios::binary);
if (file)
{
save_to_stream<T>(image, file, type, palette);
}
else throw image_writer_exception("Could not write file to " + filename );
}
template <typename T>
MAPNIK_DECL void save_to_file(T const& image,
std::string const& filename,
std::string const& type)
{
std::ofstream file (filename.c_str(), std::ios::out| std::ios::trunc|std::ios::binary);
if (file)
{
save_to_stream<T>(image, file, type);
}
else throw image_writer_exception("Could not write file to " + filename );
}
template <typename T>
MAPNIK_DECL void save_to_stream(T const& image,
std::ostream & stream,
std::string const& type,
rgba_palette const& palette)
{
if (stream && image.width() > 0 && image.height() > 0)
{
std::string t = type;
std::transform(t.begin(), t.end(), t.begin(), ::tolower);
if (t == "png" || boost::algorithm::starts_with(t, "png"))
{
png_saver_pal visitor(stream, t, palette);
mapnik::util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "tif"))
{
throw image_writer_exception("palettes are not currently supported when writing to tiff format (yet)");
}
else if (boost::algorithm::starts_with(t, "jpeg"))
{
throw image_writer_exception("palettes are not currently supported when writing to jpeg format");
}
else throw image_writer_exception("unknown file type: " + type);
}
else throw image_writer_exception("Could not write to empty stream" );
}
// This can be removed once image_any and image_view_any are the only
// items using this template
template <>
MAPNIK_DECL void save_to_stream<image_rgba8>(image_rgba8 const& image,
std::ostream & stream,
std::string const& type,
rgba_palette const& palette)
{
if (stream && image.width() > 0 && image.height() > 0)
{
std::string t = type;
std::transform(t.begin(), t.end(), t.begin(), ::tolower);
if (t == "png" || boost::algorithm::starts_with(t, "png"))
{
png_saver_pal visitor(stream, t, palette);
visitor(image);
//mapnik::util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "tif"))
{
throw image_writer_exception("palettes are not currently supported when writing to tiff format (yet)");
}
else if (boost::algorithm::starts_with(t, "jpeg"))
{
throw image_writer_exception("palettes are not currently supported when writing to jpeg format");
}
else throw image_writer_exception("unknown file type: " + type);
}
else throw image_writer_exception("Could not write to empty stream" );
}
// This can be removed once image_any and image_view_any are the only
// items using this template
template <>
MAPNIK_DECL void save_to_stream<image_view_rgba8>(image_view_rgba8 const& image,
std::ostream & stream,
std::string const& type,
rgba_palette const& palette)
{
if (stream && image.width() > 0 && image.height() > 0)
{
std::string t = type;
std::transform(t.begin(), t.end(), t.begin(), ::tolower);
if (t == "png" || boost::algorithm::starts_with(t, "png"))
{
png_saver_pal visitor(stream, t, palette);
visitor(image);
//mapnik::util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "tif"))
{
throw image_writer_exception("palettes are not currently supported when writing to tiff format (yet)");
}
else if (boost::algorithm::starts_with(t, "jpeg"))
{
throw image_writer_exception("palettes are not currently supported when writing to jpeg format");
}
else throw image_writer_exception("unknown file type: " + type);
}
else throw image_writer_exception("Could not write to empty stream" );
}
template <typename T>
MAPNIK_DECL void save_to_stream(T const& image,
std::ostream & stream,
std::string const& type)
{
if (stream && image.width() > 0 && image.height() > 0)
{
std::string t = type;
std::transform(t.begin(), t.end(), t.begin(), ::tolower);
if (t == "png" || boost::algorithm::starts_with(t, "png"))
{
png_saver visitor(stream, t);
util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "tif"))
{
tiff_saver visitor(stream, t);
util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "jpeg"))
{
jpeg_saver visitor(stream, t);
util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "webp"))
{
webp_saver visitor(stream, t);
util::apply_visitor(visitor, image);
}
else throw image_writer_exception("unknown file type: " + type);
}
else throw image_writer_exception("Could not write to empty stream" );
}
// This can be removed once image_any and image_view_any are the only
// items using this template
template <>
MAPNIK_DECL void save_to_stream<image_rgba8>(image_rgba8 const& image,
std::ostream & stream,
std::string const& type)
{
if (stream && image.width() > 0 && image.height() > 0)
{
std::string t = type;
std::transform(t.begin(), t.end(), t.begin(), ::tolower);
if (t == "png" || boost::algorithm::starts_with(t, "png"))
{
png_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "tif"))
{
tiff_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "jpeg"))
{
jpeg_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "webp"))
{
webp_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else throw image_writer_exception("unknown file type: " + type);
}
else throw image_writer_exception("Could not write to empty stream" );
}
// This can be removed once image_any and image_view_any are the only
// items using this template
template <>
MAPNIK_DECL void save_to_stream<image_view_rgba8>(image_view_rgba8 const& image,
std::ostream & stream,
std::string const& type)
{
if (stream && image.width() > 0 && image.height() > 0)
{
std::string t = type;
std::transform(t.begin(), t.end(), t.begin(), ::tolower);
if (t == "png" || boost::algorithm::starts_with(t, "png"))
{
png_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "tif"))
{
tiff_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "jpeg"))
{
jpeg_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else if (boost::algorithm::starts_with(t, "webp"))
{
webp_saver visitor(stream, t);
visitor(image);
//util::apply_visitor(visitor, image);
}
else throw image_writer_exception("unknown file type: " + type);
}
else throw image_writer_exception("Could not write to empty stream" );
}
template <typename T>
MAPNIK_DECL void save_to_file(T const& image, std::string const& filename)
{
boost::optional<std::string> type = type_from_filename(filename);
if (type)
{
save_to_file<T>(image, filename, *type);
}
else throw image_writer_exception("Could not write file to " + filename );
}
template <typename T>
MAPNIK_DECL void save_to_file(T const& image, std::string const& filename, rgba_palette const& palette)
{
boost::optional<std::string> type = type_from_filename(filename);
if (type)
{
save_to_file<T>(image, filename, *type, palette);
}
else throw image_writer_exception("Could not write file to " + filename );
}
// image_rgba8
template MAPNIK_DECL void save_to_file<image_rgba8>(image_rgba8 const&,
std::string const&,
std::string const&);
template MAPNIK_DECL void save_to_file<image_rgba8>(image_rgba8 const&,
std::string const&,
std::string const&,
rgba_palette const& palette);
template MAPNIK_DECL void save_to_file<image_rgba8>(image_rgba8 const&,
std::string const&);
template MAPNIK_DECL void save_to_file<image_rgba8>(image_rgba8 const&,
std::string const&,
rgba_palette const& palette);
template MAPNIK_DECL std::string save_to_string<image_rgba8>(image_rgba8 const&,
std::string const&);
template MAPNIK_DECL std::string save_to_string<image_rgba8>(image_rgba8 const&,
std::string const&,
rgba_palette const& palette);
// image_view_any
template MAPNIK_DECL void save_to_file<image_view_any> (image_view_any const&,
std::string const&,
std::string const&);
template MAPNIK_DECL void save_to_file<image_view_any> (image_view_any const&,
std::string const&,
std::string const&,
rgba_palette const& palette);
template MAPNIK_DECL void save_to_file<image_view_any> (image_view_any const&,
std::string const&);
template MAPNIK_DECL void save_to_file<image_view_any> (image_view_any const&,
std::string const&,
rgba_palette const& palette);
template MAPNIK_DECL std::string save_to_string<image_view_rgba8> (image_view_rgba8 const&,
std::string const&);
template MAPNIK_DECL std::string save_to_string<image_view_rgba8> (image_view_rgba8 const&,
std::string const&,
rgba_palette const& palette);
template MAPNIK_DECL std::string save_to_string<image_view_any> (image_view_any const&,
std::string const&);
template MAPNIK_DECL std::string save_to_string<image_view_any> (image_view_any const&,
std::string const&,
rgba_palette const& palette);
// image_any
template MAPNIK_DECL void save_to_file<image_any>(image_any const&,
std::string const&,
std::string const&);
template MAPNIK_DECL void save_to_file<image_any>(image_any const&,
std::string const&,
std::string const&,
rgba_palette const& palette);
template MAPNIK_DECL void save_to_file<image_any>(image_any const&,
std::string const&);
template MAPNIK_DECL void save_to_file<image_any>(image_any const&,
std::string const&,
rgba_palette const& palette);
template MAPNIK_DECL std::string save_to_string<image_any>(image_any const&,
std::string const&);
template MAPNIK_DECL std::string save_to_string<image_any>(image_any const&,
std::string const&,
rgba_palette const& palette);
namespace detail {
struct is_solid_visitor
{
bool operator() (image_view_null const&) const
{
return true;
}
bool operator() (image_null const&) const
{
return true;
}
template <typename T>
bool operator() (T const & data) const
{
using pixel_type = typename T::pixel_type;
if (data.width() > 0 && data.height() > 0)
{
pixel_type const* first_row = data.get_row(0);
pixel_type const first_pixel = first_row[0];
for (std::size_t y = 0; y < data.height(); ++y)
{
pixel_type const * row = data.get_row(y);
for (std::size_t x = 0; x < data.width(); ++x)
{
if (first_pixel != row[x])
{
return false;
}
}
}
}
return true;
}
};
} // end detail ns
MAPNIK_DECL bool is_solid(image_any const& image)
{
return util::apply_visitor(detail::is_solid_visitor(), image);
}
MAPNIK_DECL bool is_solid(image_view_any const& image)
{
return util::apply_visitor(detail::is_solid_visitor(), image);
}
template <typename T>
MAPNIK_DECL bool is_solid(T const& image)
{
detail::is_solid_visitor visitor;
return visitor(image);
}
template MAPNIK_DECL bool is_solid(image_null const&);
template MAPNIK_DECL bool is_solid(image_rgba8 const&);
template MAPNIK_DECL bool is_solid(image_gray8 const&);
template MAPNIK_DECL bool is_solid(image_gray8s const&);
template MAPNIK_DECL bool is_solid(image_gray16 const&);
template MAPNIK_DECL bool is_solid(image_gray16s const&);
template MAPNIK_DECL bool is_solid(image_gray32 const&);
template MAPNIK_DECL bool is_solid(image_gray32s const&);
template MAPNIK_DECL bool is_solid(image_gray32f const&);
template MAPNIK_DECL bool is_solid(image_gray64 const&);
template MAPNIK_DECL bool is_solid(image_gray64s const&);
template MAPNIK_DECL bool is_solid(image_gray64f const&);
template MAPNIK_DECL bool is_solid(image_view_null const&);
template MAPNIK_DECL bool is_solid(image_view_rgba8 const&);
template MAPNIK_DECL bool is_solid(image_view_gray8 const&);
template MAPNIK_DECL bool is_solid(image_view_gray8s const&);
template MAPNIK_DECL bool is_solid(image_view_gray16 const&);
template MAPNIK_DECL bool is_solid(image_view_gray16s const&);
template MAPNIK_DECL bool is_solid(image_view_gray32 const&);
template MAPNIK_DECL bool is_solid(image_view_gray32s const&);
template MAPNIK_DECL bool is_solid(image_view_gray32f const&);
template MAPNIK_DECL bool is_solid(image_view_gray64 const&);
template MAPNIK_DECL bool is_solid(image_view_gray64s const&);
template MAPNIK_DECL bool is_solid(image_view_gray64f const&);
namespace detail {
struct premultiply_visitor
{
bool operator() (image_rgba8 & data) const
{
if (!data.get_premultiplied())
{
agg::rendering_buffer buffer(data.bytes(),safe_cast<unsigned>(data.width()),safe_cast<unsigned>(data.height()),safe_cast<int>(data.row_size()));
agg::pixfmt_rgba32 pixf(buffer);
pixf.premultiply();
data.set_premultiplied(true);
return true;
}
return false;
}
template <typename T>
bool operator() (T &) const
{
return false;
}
};
struct demultiply_visitor
{
bool operator() (image_rgba8 & data) const
{
if (data.get_premultiplied())
{
agg::rendering_buffer buffer(data.bytes(),safe_cast<unsigned>(data.width()),safe_cast<unsigned>(data.height()),safe_cast<int>(data.row_size()));
agg::pixfmt_rgba32_pre pixf(buffer);
pixf.demultiply();
data.set_premultiplied(false);
return true;
}
return false;
}
template <typename T>
bool operator() (T &) const
{
return false;
}
};
struct set_premultiplied_visitor
{
set_premultiplied_visitor(bool status)
: status_(status) {}
template <typename T>
void operator() (T & data) const
{
data.set_premultiplied(status_);
}
private:
bool const status_;
};
} // end detail ns
MAPNIK_DECL bool premultiply_alpha(image_any & image)
{
return util::apply_visitor(detail::premultiply_visitor(), image);
}
template <typename T>
MAPNIK_DECL bool premultiply_alpha(T & image)
{
detail::premultiply_visitor visit;
return visit(image);
}
template MAPNIK_DECL bool premultiply_alpha(image_rgba8 &);
template MAPNIK_DECL bool premultiply_alpha(image_gray8 &);
template MAPNIK_DECL bool premultiply_alpha(image_gray8s &);
template MAPNIK_DECL bool premultiply_alpha(image_gray16 &);
template MAPNIK_DECL bool premultiply_alpha(image_gray16s &);
template MAPNIK_DECL bool premultiply_alpha(image_gray32 &);
template MAPNIK_DECL bool premultiply_alpha(image_gray32s &);
template MAPNIK_DECL bool premultiply_alpha(image_gray32f &);
template MAPNIK_DECL bool premultiply_alpha(image_gray64 &);
template MAPNIK_DECL bool premultiply_alpha(image_gray64s &);
template MAPNIK_DECL bool premultiply_alpha(image_gray64f &);
MAPNIK_DECL bool demultiply_alpha(image_any & image)
{
return util::apply_visitor(detail::demultiply_visitor(), image);
}
template <typename T>
MAPNIK_DECL bool demultiply_alpha(T & image)
{
detail::demultiply_visitor visit;
return visit(image);
}
template MAPNIK_DECL bool demultiply_alpha(image_rgba8 &);
template MAPNIK_DECL bool demultiply_alpha(image_gray8 &);
template MAPNIK_DECL bool demultiply_alpha(image_gray8s &);
template MAPNIK_DECL bool demultiply_alpha(image_gray16 &);
template MAPNIK_DECL bool demultiply_alpha(image_gray16s &);
template MAPNIK_DECL bool demultiply_alpha(image_gray32 &);
template MAPNIK_DECL bool demultiply_alpha(image_gray32s &);
template MAPNIK_DECL bool demultiply_alpha(image_gray32f &);
template MAPNIK_DECL bool demultiply_alpha(image_gray64 &);
template MAPNIK_DECL bool demultiply_alpha(image_gray64s &);
template MAPNIK_DECL bool demultiply_alpha(image_gray64f &);
MAPNIK_DECL void set_premultiplied_alpha(image_any & image, bool status)
{
util::apply_visitor(detail::set_premultiplied_visitor(status), image);
}
template <typename T>
MAPNIK_DECL void set_premultiplied_alpha(T & image, bool status)
{
detail::set_premultiplied_visitor visit(status);
visit(image);
}
template MAPNIK_DECL void set_premultiplied_alpha(image_rgba8 &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray8 &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray8s &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray16 &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray16s &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray32 &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray32s &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray32f &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray64 &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray64s &, bool);
template MAPNIK_DECL void set_premultiplied_alpha(image_gray64f &, bool);
namespace detail {
namespace {
template <typename T>
inline T clamp(T d, T min, T max)
{
T const t = d < min ? min : d;
return t > max ? max : t;
}
}
struct visitor_apply_opacity
{
visitor_apply_opacity(float opacity)
: opacity_(clamp(opacity, 0.0f, 1.0f)) {}
void operator() (image_rgba8 & data) const
{
using pixel_type = image_rgba8::pixel_type;
for (std::size_t y = 0; y < data.height(); ++y)
{
pixel_type* row_to = data.get_row(y);
for (std::size_t x = 0; x < data.width(); ++x)
{
pixel_type rgba = row_to[x];
pixel_type a = static_cast<pixel_type>(((rgba >> 24u) & 0xff) * opacity_);
pixel_type r = rgba & 0xff;
pixel_type g = (rgba >> 8u ) & 0xff;
pixel_type b = (rgba >> 16u) & 0xff;
row_to[x] = (a << 24u) | (b << 16u) | (g << 8u) | (r) ;
}
}
}
template <typename T>
void operator() (T & data) const
{
throw std::runtime_error("Error: apply_opacity with " + std::string(typeid(data).name()) + " is not supported");
}
private:
float const opacity_;
};
} // end detail ns
MAPNIK_DECL void apply_opacity(image_any & data, float opacity)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
util::apply_visitor(detail::visitor_apply_opacity(opacity), data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template <typename T>
MAPNIK_DECL void apply_opacity(T & data, float opacity)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
detail::visitor_apply_opacity visit(opacity);
visit(data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template MAPNIK_DECL void apply_opacity(image_rgba8 &, float);
template MAPNIK_DECL void apply_opacity(image_gray8 &, float);
template MAPNIK_DECL void apply_opacity(image_gray8s &, float);
template MAPNIK_DECL void apply_opacity(image_gray16 &, float);
template MAPNIK_DECL void apply_opacity(image_gray16s &, float);
template MAPNIK_DECL void apply_opacity(image_gray32 &, float);
template MAPNIK_DECL void apply_opacity(image_gray32s &, float);
template MAPNIK_DECL void apply_opacity(image_gray32f &, float);
template MAPNIK_DECL void apply_opacity(image_gray64 &, float);
template MAPNIK_DECL void apply_opacity(image_gray64s &, float);
template MAPNIK_DECL void apply_opacity(image_gray64f &, float);
namespace detail {
struct visitor_set_grayscale_to_alpha
{
void operator() (image_rgba8 & data) const
{
using pixel_type = image_rgba8::pixel_type;
for (std::size_t y = 0; y < data.height(); ++y)
{
pixel_type* row_from = data.get_row(y);
for (std::size_t x = 0; x < data.width(); ++x)
{
pixel_type rgba = row_from[x];
pixel_type r = rgba & 0xff;
pixel_type g = (rgba >> 8u) & 0xff;
pixel_type b = (rgba >> 16u) & 0xff;
// magic numbers for grayscale
pixel_type a = static_cast<pixel_type>(std::ceil((r * .3) + (g * .59) + (b * .11)));
row_from[x] = (a << 24u) | (255 << 16u) | (255 << 8u) | (255u) ;
}
}
}
template <typename T>
void operator() (T & data) const
{
MAPNIK_LOG_WARN(image_util) << "Warning: set_grayscale_to_alpha with " + std::string(typeid(data).name()) + " is not supported, image was not modified";
}
};
struct visitor_set_grayscale_to_alpha_c
{
visitor_set_grayscale_to_alpha_c(color const& c)
: c_(c) {}
void operator() (image_rgba8 & data) const
{
using pixel_type = image_rgba8::pixel_type;
for (std::size_t y = 0; y < data.height(); ++y)
{
pixel_type* row_from = data.get_row(y);
for (std::size_t x = 0; x < data.width(); ++x)
{
pixel_type rgba = row_from[x];
pixel_type r = rgba & 0xff;
pixel_type g = (rgba >> 8 ) & 0xff;
pixel_type b = (rgba >> 16) & 0xff;
// magic numbers for grayscale
pixel_type a = static_cast<pixel_type>(std::ceil((r * .3) + (g * .59) + (b * .11)));
row_from[x] = static_cast<unsigned>(a << 24u) |
static_cast<unsigned>(c_.blue() << 16u) |
static_cast<unsigned>(c_.green() << 8u) |
static_cast<unsigned>(c_.red() );
}
}
}
template <typename T>
void operator() (T & data) const
{
MAPNIK_LOG_WARN(image_util) << "Warning: set_grayscale_to_alpha with " + std::string(typeid(data).name()) + " is not supported, image was not modified";
}
private:
color const& c_;
};
} // end detail ns
MAPNIK_DECL void set_grayscale_to_alpha(image_any & data)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
util::apply_visitor(detail::visitor_set_grayscale_to_alpha(), data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template <typename T>
MAPNIK_DECL void set_grayscale_to_alpha(T & data)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
detail::visitor_set_grayscale_to_alpha visit;
visit(data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template MAPNIK_DECL void set_grayscale_to_alpha(image_rgba8 &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray8 &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray8s &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray16 &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray16s &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray32 &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray32s &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray32f &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray64 &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray64s &);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray64f &);
MAPNIK_DECL void set_grayscale_to_alpha(image_any & data, color const& c)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
util::apply_visitor(detail::visitor_set_grayscale_to_alpha_c(c), data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template <typename T>
MAPNIK_DECL void set_grayscale_to_alpha(T & data, color const& c)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
detail::visitor_set_grayscale_to_alpha_c visit(c);
visit(data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template MAPNIK_DECL void set_grayscale_to_alpha(image_rgba8 &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray8 &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray8s &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray16 &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray16s &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray32 &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray32s &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray32f &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray64 &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray64s &, color const&);
template MAPNIK_DECL void set_grayscale_to_alpha(image_gray64f &, color const&);
namespace detail {
struct visitor_set_color_to_alpha
{
visitor_set_color_to_alpha(color const& c)
: c_(c) {}
void operator() (image_rgba8 & data) const
{
using pixel_type = image_rgba8::pixel_type;
for (std::size_t y = 0; y < data.height(); ++y)
{
pixel_type* row_from = data.get_row(y);
for (std::size_t x = 0; x < data.width(); ++x)
{
pixel_type rgba = row_from[x];
pixel_type r = rgba & 0xff;
pixel_type g = (rgba >> 8 ) & 0xff;
pixel_type b = (rgba >> 16) & 0xff;
if (r == c_.red() && g == c_.green() && b == c_.blue())
{
row_from[x] = 0;
}
}
}
}
template <typename T>
void operator() (T & data) const
{
throw std::runtime_error("Error: set_color_to_alpha with " + std::string(typeid(data).name()) + " is not supported");
}
private:
color const& c_;
};
} // end detail ns
MAPNIK_DECL void set_color_to_alpha (image_any & data, color const& c)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
util::apply_visitor(detail::visitor_set_color_to_alpha(c), data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template <typename T>
MAPNIK_DECL void set_color_to_alpha(T & data, color const& c)
{
// Prior to calling the data must not be premultiplied
bool remultiply = mapnik::demultiply_alpha(data);
detail::visitor_set_color_to_alpha visit(c);
visit(data);
if (remultiply)
{
mapnik::premultiply_alpha(data);
}
}
template MAPNIK_DECL void set_color_to_alpha(image_rgba8 &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray8 &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray8s &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray16 &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray16s &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray32 &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray32s &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray32f &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray64 &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray64s &, color const&);
template MAPNIK_DECL void set_color_to_alpha(image_gray64f &, color const&);
namespace detail {
template <typename T1>
struct visitor_fill
{
visitor_fill(T1 const& val)
: val_(val) {}
template <typename T2>
void operator() (T2 & data) const
{
using pixel_type = typename T2::pixel_type;
data.set(safe_cast<pixel_type>(val_));
}
private:
T1 const& val_;
};
template<>
struct visitor_fill<color>
{
visitor_fill(color const& val)
: val_(val) {}
void operator() (image_rgba8 & data) const
{
using pixel_type = image_rgba8::pixel_type;
pixel_type val = static_cast<pixel_type>(val_.rgba());
data.set(val);
data.set_premultiplied(val_.get_premultiplied());
}
template <typename T2>
void operator() (T2 & data) const
{
using pixel_type = typename T2::pixel_type;
pixel_type val = static_cast<pixel_type>(val_.rgba());
data.set(val);
}
private:
color const& val_;
};
} // end detail ns
template <typename T>
MAPNIK_DECL void fill (image_any & data, T const& val)
{
util::apply_visitor(detail::visitor_fill<T>(val), data);
}
template MAPNIK_DECL void fill(image_any &, color const&);
template MAPNIK_DECL void fill(image_any &, uint64_t const&);
template MAPNIK_DECL void fill(image_any &, int64_t const&);
template MAPNIK_DECL void fill(image_any &, uint32_t const&);
template MAPNIK_DECL void fill(image_any &, int32_t const&);
template MAPNIK_DECL void fill(image_any &, uint16_t const&);
template MAPNIK_DECL void fill(image_any &, int16_t const&);
template MAPNIK_DECL void fill(image_any &, uint8_t const&);
template MAPNIK_DECL void fill(image_any &, int8_t const&);
template MAPNIK_DECL void fill(image_any &, float const&);
template MAPNIK_DECL void fill(image_any &, double const&);
template <typename T>
MAPNIK_DECL void fill (image_rgba8 & data, T const& val)
{
detail::visitor_fill<T> visitor(val);
return visitor(data);