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/* */
/* Copyright 2012 Christoph Spiel */
/* */
/* This file is part of the VIGRA computer vision library. */
/* The VIGRA Website is */
/* http://hci.iwr.uni-heidelberg.de/vigra/ */
/* Please direct questions, bug reports, and contributions to */
/* ullrich.koethe@iwr.uni-heidelberg.de or */
/* vigra@informatik.uni-hamburg.de */
/* */
/* Permission is hereby granted, free of charge, to any person */
/* obtaining a copy of this software and associated documentation */
/* files (the "Software"), to deal in the Software without */
/* restriction, including without limitation the rights to use, */
/* copy, modify, merge, publish, distribute, sublicense, and/or */
/* sell copies of the Software, and to permit persons to whom the */
/* Software is furnished to do so, subject to the following */
/* conditions: */
/* */
/* The above copyright notice and this permission notice shall be */
/* included in all copies or substantial portions of the */
/* Software. */
/* */
/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND */
/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES */
/* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND */
/* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT */
/* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, */
/* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING */
/* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR */
/* OTHER DEALINGS IN THE SOFTWARE. */
/* */
/************************************************************************/
#ifndef VIGRA_IMPEXALPHA_HXX
#define VIGRA_IMPEXALPHA_HXX
#include <vector>
#include "imageinfo.hxx"
#include "impex.hxx"
#include "impexbase.hxx"
namespace vigra
{
/** \addtogroup VigraImpex
* @{
*/
namespace detail
{
template <class ValueType,
class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
void
read_image_band_and_alpha(Decoder* decoder,
ImageIterator image_iterator, ImageAccessor image_accessor,
AlphaIterator alpha_iterator, AlphaAccessor alpha_accessor)
{
typedef typename ImageIterator::row_iterator ImageRowIterator;
typedef typename AlphaIterator::row_iterator AlphaRowIterator;
vigra_precondition(decoder->getNumExtraBands() == 1,
"vigra::detail::read_image_band_and_alpha: expecting exactly one alpha band");
vigra_precondition(decoder->getNumBands() - decoder->getNumExtraBands() == 1,
"vigra::detail::read_image_band_and_alpha: expecting exactly one image band");
const unsigned width(decoder->getWidth());
const unsigned height(decoder->getHeight());
const unsigned offset(decoder->getOffset());
for (unsigned y = 0U; y != height; ++y)
{
decoder->nextScanline();
const ValueType* scanline0 = static_cast<const ValueType*>(decoder->currentScanlineOfBand(0));
const ValueType* scanline1 = static_cast<const ValueType*>(decoder->currentScanlineOfBand(1));
ImageRowIterator is(image_iterator.rowIterator());
const ImageRowIterator is_end(is + width);
AlphaRowIterator as(alpha_iterator.rowIterator());
while (is != is_end)
{
image_accessor.set(*scanline0, is);
scanline0 += offset;
++is;
alpha_accessor.set(*scanline1, as);
scanline1 += offset;
++as;
}
++image_iterator.y;
++alpha_iterator.y;
}
}
template <class ValueType,
class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
void
read_image_bands_and_alpha(Decoder* decoder,
ImageIterator image_iterator, ImageAccessor image_accessor,
AlphaIterator alpha_iterator, AlphaAccessor alpha_accessor)
{
typedef typename ImageIterator::row_iterator ImageRowIterator;
typedef typename AlphaIterator::row_iterator AlphaRowIterator;
vigra_precondition(decoder->getNumExtraBands() == 1,
"vigra::detail::read_image_bands_and_alpha: expecting exactly one alpha band");
vigra_precondition(decoder->getNumBands() - decoder->getNumExtraBands() == image_accessor.size(image_iterator),
"vigra::detail::read_image_bands_and_alpha: number of channels and image accessor do not match");
const unsigned width(decoder->getWidth());
const unsigned height(decoder->getHeight());
const unsigned offset(decoder->getOffset());
const unsigned accessor_size(image_accessor.size(image_iterator));
// OPTIMIZATION: Specialization for the most common case
// of an RGBA-image, i.e. three color channels plus one
// alpha channel.
if (accessor_size == 3U)
{
const ValueType* scanline_0;
const ValueType* scanline_1;
const ValueType* scanline_2;
const ValueType* scanline_3; // alpha
for (unsigned y = 0U; y != height; ++y)
{
decoder->nextScanline();
scanline_0 = static_cast<const ValueType*>(decoder->currentScanlineOfBand(0));
scanline_1 = static_cast<const ValueType*>(decoder->currentScanlineOfBand(1));
scanline_2 = static_cast<const ValueType*>(decoder->currentScanlineOfBand(2));
scanline_3 = static_cast<const ValueType*>(decoder->currentScanlineOfBand(3));
ImageRowIterator is(image_iterator.rowIterator());
const ImageRowIterator is_end(is + width);
AlphaRowIterator as(alpha_iterator.rowIterator());
while (is != is_end)
{
image_accessor.setComponent(*scanline_0, is, 0);
image_accessor.setComponent(*scanline_1, is, 1);
image_accessor.setComponent(*scanline_2, is, 2);
alpha_accessor.set(*scanline_3, as);
scanline_0 += offset;
scanline_1 += offset;
scanline_2 += offset;
scanline_3 += offset;
++is;
++as;
}
++image_iterator.y;
++alpha_iterator.y;
}
}
else
{
std::vector<const ValueType*> scanlines(accessor_size + 1U);
for (unsigned y = 0U; y != height; ++y)
{
decoder->nextScanline();
for (unsigned i = 0U; i != accessor_size + 1U; ++i)
{
scanlines[i] = static_cast<const ValueType*>(decoder->currentScanlineOfBand(i));
}
ImageRowIterator is(image_iterator.rowIterator());
const ImageRowIterator is_end(is + width);
AlphaRowIterator as(alpha_iterator.rowIterator());
while (is != is_end)
{
for (unsigned i = 0U; i != accessor_size; ++i)
{
image_accessor.setComponent(*scanlines[i], is, static_cast<int>(i));
scanlines[i] += offset;
}
++is;
alpha_accessor.set(*scanlines[accessor_size], as);
scanlines[accessor_size] += offset;
++as;
}
++image_iterator.y;
++alpha_iterator.y;
}
}
}
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
void
importImageAlpha(const ImageImportInfo& import_info,
ImageIterator image_iterator, ImageAccessor image_accessor,
AlphaIterator alpha_iterator, AlphaAccessor alpha_accessor,
/* isScalar? */ VigraTrueType)
{
VIGRA_UNIQUE_PTR<Decoder> decoder(vigra::decoder(import_info));
switch (pixel_t_of_string(decoder->getPixelType()))
{
case UNSIGNED_INT_8:
read_image_band_and_alpha<UInt8>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case UNSIGNED_INT_16:
read_image_band_and_alpha<UInt16>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case UNSIGNED_INT_32:
read_image_band_and_alpha<UInt32>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case SIGNED_INT_16:
read_image_band_and_alpha<Int16>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case SIGNED_INT_32:
read_image_band_and_alpha<Int32>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case IEEE_FLOAT_32:
read_image_band_and_alpha<float>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case IEEE_FLOAT_64:
read_image_band_and_alpha<double>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
default:
vigra_fail("vigra::detail::importImageAlpha<scalar>: not reached");
}
decoder->close();
}
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
void
importImageAlpha(const ImageImportInfo& import_info,
ImageIterator image_iterator, ImageAccessor image_accessor,
AlphaIterator alpha_iterator, AlphaAccessor alpha_accessor,
/* isScalar? */ VigraFalseType)
{
VIGRA_UNIQUE_PTR<Decoder> decoder(vigra::decoder(import_info));
switch (pixel_t_of_string(decoder->getPixelType()))
{
case UNSIGNED_INT_8:
read_image_bands_and_alpha<UInt8>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case UNSIGNED_INT_16:
read_image_bands_and_alpha<UInt16>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case UNSIGNED_INT_32:
read_image_bands_and_alpha<UInt32>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case SIGNED_INT_16:
read_image_bands_and_alpha<Int16>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case SIGNED_INT_32:
read_image_bands_and_alpha<Int32>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case IEEE_FLOAT_32:
read_image_bands_and_alpha<float>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
case IEEE_FLOAT_64:
read_image_bands_and_alpha<double>(decoder.get(),
image_iterator, image_accessor,
alpha_iterator, alpha_accessor);
break;
default:
vigra_fail("vigra::detail::importImageAlpha<non-scalar>: not reached");
}
decoder->close();
}
} // end namespace detail
/*!
* \brief Read the image specified by the given \ref
* vigra::ImageImportInfo object including its alpha channel.
*
* <B>Declarations</B>
*
* Pass arguments explicitly:
* \code
* namespace vigra {
* template <class ImageIterator, class ImageAccessor,
* class AlphaIterator, class AlphaAccessor>
* void
* importImageAlpha(const ImageImportInfo& importInfo,
* ImageIterator imageIterator, ImageAccessor imageAccessor,
* AlphaIterator alphaIterator, AlphaAccessor alphaAccessor)
* }
* \endcode
*
* Use argument objects in conjunction with \ref ArgumentObjectFactories :
* \code
* namespace vigra {
* template <class ImageIterator, class ImageAccessor,
* class AlphaIterator, class AlphaAccessor>
* void
* importImageAlpha(const ImageImportInfo& importInfo,
* const pair<ImageIterator, ImageAccessor>& image,
* const pair<AlphaIterator, AlphaAccessor>& alpha)
* }
* \endcode
*
* <B>Usage</B>
*
* <B>\#include \<vigra/impexalpha.hxx\></B>
*
* Namespace: vigra
* \code
* typedef UInt8 value_t;
* ImageImportInfo info("zorro.tif");
*
* if (info.isGrayscale())
* {
* BasicImage<value_t> alpha(info.size());
* BasicImage<value_t> image(info.size());
*
* importImageAlpha(info,
* image.upperLeft(), image.accessor(),
* alpha.upperLeft(), alpha.accessor());
* ...
* }
* else
* {
* BasicImage<value_t> alpha(info.size());
* BasicImage<vigra::RGBValue<value_t> > image(info.size());
*
* importImageAlpha(info,
* image.upperLeft(), image.accessor(),
* alpha.upperLeft(), alpha.accessor());
* ...
* }
* \endcode
*
* <B>Preconditions</B>
*
* - The same preconditions hold as for importImage(), however the
* only image formats that support alpha channels are
* + TIFF and
* + PNG.
* In particular, JPEG does <B>not</B> support alpha channels.
* - The alpha channel always is scalar-valued, i.e. comprises a
* single band.
*/
doxygen_overloaded_function(template <...> inline void importImageAlpha)
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
inline void
importImageAlpha(const ImageImportInfo& import_info,
ImageIterator image_iterator, ImageAccessor image_accessor,
AlphaIterator alpha_iterator, AlphaAccessor alpha_accessor)
{
typedef typename ImageAccessor::value_type ImageValueType;
typedef typename vigra::NumericTraits<ImageValueType>::isScalar is_scalar;
detail::importImageAlpha(import_info,
image_iterator, image_accessor,
alpha_iterator, alpha_accessor,
is_scalar());
}
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
inline void
importImageAlpha(const ImageImportInfo& import_info,
const vigra::pair<ImageIterator, ImageAccessor>& image,
const vigra::pair<AlphaIterator, AlphaAccessor>& alpha)
{
importImageAlpha(import_info,
image.first, image.second,
alpha.first, alpha.second);
}
namespace detail
{
template<class ValueType,
class ImageIterator, class ImageAccessor, class ImageScaler,
class AlphaIterator, class AlphaAccessor, class AlphaScaler>
void
write_image_band_and_alpha(Encoder* encoder,
ImageIterator image_upper_left, ImageIterator image_lower_right, ImageAccessor image_accessor,
const ImageScaler& image_scaler,
AlphaIterator alpha_upper_left, AlphaAccessor alpha_accessor,
const AlphaScaler& alpha_scaler)
{
typedef typename ImageIterator::row_iterator ImageRowIterator;
typedef typename ImageAccessor::value_type ImageValueType;
typedef typename AlphaIterator::row_iterator AlphaRowIterator;
typedef typename AlphaAccessor::value_type AlphaValueType;
typedef detail::RequiresExplicitCast<ValueType> explicit_cast;
vigra_precondition(image_lower_right.x >= image_upper_left.x,
"vigra::detail::write_image_band_and_alpha: negative width");
vigra_precondition(image_lower_right.y >= image_upper_left.y,
"vigra::detail::write_image_band_and_alpha: negative height");
const unsigned width(static_cast<unsigned>(image_lower_right.x - image_upper_left.x));
const unsigned height(static_cast<unsigned>(image_lower_right.y - image_upper_left.y));
encoder->setWidth(width);
encoder->setHeight(height);
encoder->setNumBands(1 + 1);
encoder->finalizeSettings();
const unsigned offset(encoder->getOffset()); // correct offset only _after_ finalizeSettings()
// IMPLEMENTATION NOTE: We avoid calling the default constructor
// to allow classes ImageIterator and AlphaIterator that do not
// define one.
ImageIterator image_iterator(image_upper_left);
AlphaIterator alpha_iterator(alpha_upper_left);
for (unsigned y = 0U; y != height; ++y)
{
ValueType* scanline0 = static_cast<ValueType*>(encoder->currentScanlineOfBand(0));
ValueType* scanline1 = static_cast<ValueType*>(encoder->currentScanlineOfBand(1));
ImageRowIterator is(image_iterator.rowIterator());
const ImageRowIterator is_end(is + width);
AlphaRowIterator as(alpha_iterator.rowIterator());
while (is != is_end)
{
*scanline0 = explicit_cast::cast(image_scaler(image_accessor(is)));
scanline0 += offset;
++is;
*scanline1 = explicit_cast::cast(alpha_scaler(alpha_accessor(as)));
scanline1 += offset;
++as;
}
encoder->nextScanline();
++image_iterator.y;
++alpha_iterator.y;
}
}
template<class ValueType,
class ImageIterator, class ImageAccessor, class ImageScaler,
class AlphaIterator, class AlphaAccessor, class AlphaScaler>
void
write_image_bands_and_alpha(Encoder* encoder,
ImageIterator image_upper_left, ImageIterator image_lower_right, ImageAccessor image_accessor,
const ImageScaler& image_scaler,
AlphaIterator alpha_upper_left, AlphaAccessor alpha_accessor,
const AlphaScaler& alpha_scaler)
{
typedef typename ImageIterator::row_iterator ImageRowIterator;
typedef typename AlphaIterator::row_iterator AlphaRowIterator;
typedef detail::RequiresExplicitCast<ValueType> explicit_cast;
vigra_precondition(image_lower_right.x >= image_upper_left.x,
"vigra::detail::write_image_bands_and_alpha: negative width");
vigra_precondition(image_lower_right.y >= image_upper_left.y,
"vigra::detail::write_image_bands_and_alpha: negative height");
const unsigned width(static_cast<unsigned>(image_lower_right.x - image_upper_left.x));
const unsigned height(static_cast<unsigned>(image_lower_right.y - image_upper_left.y));
const unsigned accessor_size(image_accessor.size(image_upper_left));
encoder->setWidth(width);
encoder->setHeight(height);
encoder->setNumBands(accessor_size + 1U);
encoder->finalizeSettings();
const unsigned offset(encoder->getOffset()); // correct offset only _after_ finalizeSettings()
// IMPLEMENTATION NOTE: We avoid calling the default constructor
// to allow classes ImageIterator and AlphaIterator that do not
// define one.
ImageIterator image_iterator(image_upper_left);
AlphaIterator alpha_iterator(alpha_upper_left);
// OPTIMIZATION: Specialization for the most common case
// of an RGBA-image, i.e. three color channels plus one
// alpha channel.
if (accessor_size == 3U)
{
ValueType* scanline_0;
ValueType* scanline_1;
ValueType* scanline_2;
ValueType* scanline_3; // alpha
for (unsigned y = 0U; y != height; ++y)
{
scanline_0 = static_cast<ValueType*>(encoder->currentScanlineOfBand(0));
scanline_1 = static_cast<ValueType*>(encoder->currentScanlineOfBand(1));
scanline_2 = static_cast<ValueType*>(encoder->currentScanlineOfBand(2));
scanline_3 = static_cast<ValueType*>(encoder->currentScanlineOfBand(3));
ImageRowIterator is(image_iterator.rowIterator());
const ImageRowIterator is_end(is + width);
AlphaRowIterator as(alpha_iterator.rowIterator());
while (is != is_end)
{
*scanline_0 = explicit_cast::cast(image_scaler(image_accessor.getComponent(is, 0)));
*scanline_1 = explicit_cast::cast(image_scaler(image_accessor.getComponent(is, 1)));
*scanline_2 = explicit_cast::cast(image_scaler(image_accessor.getComponent(is, 2)));
*scanline_3 = explicit_cast::cast(alpha_scaler(alpha_accessor(as)));
scanline_0 += offset;
scanline_1 += offset;
scanline_2 += offset;
scanline_3 += offset;
++is;
++as;
}
encoder->nextScanline();
++image_iterator.y;
++alpha_iterator.y;
}
}
else
{
std::vector<ValueType*> scanlines(accessor_size + 1U);
for (unsigned y = 0U; y != height; ++y)
{
for (unsigned i = 0U; i != accessor_size + 1U; ++i)
{
scanlines[i] = static_cast<ValueType*>(encoder->currentScanlineOfBand(i));
}
ImageRowIterator is(image_iterator.rowIterator());
const ImageRowIterator is_end(is + width);
AlphaRowIterator as(alpha_iterator.rowIterator());
while (is != is_end)
{
for (unsigned i = 0U; i != accessor_size; ++i)
{
*scanlines[i] = explicit_cast::cast(image_scaler(image_accessor.getComponent(is, static_cast<int>(i))));
scanlines[i] += offset;
}
++is;
*scanlines[accessor_size] = explicit_cast::cast(alpha_scaler(alpha_accessor(as)));
scanlines[accessor_size] += offset;
++as;
}
encoder->nextScanline();
++image_iterator.y;
++alpha_iterator.y;
}
}
}
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
void
exportImageAlpha(ImageIterator image_upper_left, ImageIterator image_lower_right, ImageAccessor image_accessor,
AlphaIterator alpha_upper_left, AlphaAccessor alpha_accessor,
const ImageExportInfo& export_info,
/* isScalar? */ VigraTrueType)
{
typedef typename ImageAccessor::value_type ImageValueType;
VIGRA_UNIQUE_PTR<Encoder> encoder(vigra::encoder(export_info));
std::string pixel_type(export_info.getPixelType());
const bool downcast(negotiatePixelType(encoder->getFileType(), TypeAsString<ImageValueType>::result(), pixel_type));
const pixel_t type(pixel_t_of_string(pixel_type));
encoder->setPixelType(pixel_type);
const range_t image_source_range(find_source_value_range(export_info,
image_upper_left, image_lower_right, image_accessor));
const range_t alpha_source_range(find_source_value_range(export_info,
alpha_upper_left,
alpha_upper_left + (image_lower_right - image_upper_left),
alpha_accessor));
const range_t destination_range(find_destination_value_range(export_info, type));
if ((downcast || export_info.hasForcedRangeMapping()) &&
(image_source_range.first != destination_range.first || image_source_range.second != destination_range.second ||
alpha_source_range.first != destination_range.first || alpha_source_range.second != destination_range.second))
{
const linear_transform image_rescaler(image_source_range, destination_range);
const linear_transform alpha_rescaler(alpha_source_range, destination_range);
switch (type)
{
case UNSIGNED_INT_8:
write_image_band_and_alpha<UInt8>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case UNSIGNED_INT_16:
write_image_band_and_alpha<UInt16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case UNSIGNED_INT_32:
write_image_band_and_alpha<UInt32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case SIGNED_INT_16:
write_image_band_and_alpha<Int16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case SIGNED_INT_32:
write_image_band_and_alpha<Int32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case IEEE_FLOAT_32:
write_image_band_and_alpha<float>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case IEEE_FLOAT_64:
write_image_band_and_alpha<double>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
default:
vigra_fail("vigra::detail::exportImageAlpha<scalar>: not reached");
}
}
else
{
switch (type)
{
case UNSIGNED_INT_8:
write_image_band_and_alpha<UInt8>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case UNSIGNED_INT_16:
write_image_band_and_alpha<UInt16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case UNSIGNED_INT_32:
write_image_band_and_alpha<UInt32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case SIGNED_INT_16:
write_image_band_and_alpha<Int16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case SIGNED_INT_32:
write_image_band_and_alpha<Int32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case IEEE_FLOAT_32:
write_image_band_and_alpha<float>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case IEEE_FLOAT_64:
write_image_band_and_alpha<double>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
default:
vigra_fail("vigra::detail::exportImageAlpha<scalar>: not reached");
}
}
encoder->close();
}
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
void
exportImageAlpha(ImageIterator image_upper_left, ImageIterator image_lower_right, ImageAccessor image_accessor,
AlphaIterator alpha_upper_left, AlphaAccessor alpha_accessor,
const ImageExportInfo& export_info,
/* isScalar? */ VigraFalseType)
{
typedef typename ImageAccessor::value_type ImageBaseType;
typedef typename ImageBaseType::value_type ImageValueType;
VIGRA_UNIQUE_PTR<Encoder> encoder(vigra::encoder(export_info));
std::string pixel_type(export_info.getPixelType());
const bool downcast(negotiatePixelType(encoder->getFileType(), TypeAsString<ImageValueType>::result(), pixel_type));
const pixel_t type(pixel_t_of_string(pixel_type));
encoder->setPixelType(pixel_type);
vigra_precondition(isBandNumberSupported(encoder->getFileType(), image_accessor.size(image_upper_left)),
"exportImageAlpha(): file format does not support requested number of bands (color channels)");
const range_t image_source_range(find_source_value_range(export_info,
image_upper_left, image_lower_right, image_accessor));
const range_t alpha_source_range(find_source_value_range(export_info,
alpha_upper_left,
alpha_upper_left + (image_lower_right - image_upper_left),
alpha_accessor));
const range_t destination_range(find_destination_value_range(export_info, pixel_t_of_string(pixel_type)));
if ((downcast || export_info.hasForcedRangeMapping()) &&
(image_source_range.first != destination_range.first || image_source_range.second != destination_range.second ||
alpha_source_range.first != destination_range.first || alpha_source_range.second != destination_range.second))
{
const linear_transform image_rescaler(image_source_range, destination_range);
const linear_transform alpha_rescaler(alpha_source_range, destination_range);
switch (type)
{
case UNSIGNED_INT_8:
write_image_bands_and_alpha<UInt8>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case UNSIGNED_INT_16:
write_image_bands_and_alpha<UInt16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case UNSIGNED_INT_32:
write_image_bands_and_alpha<UInt32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case SIGNED_INT_16:
write_image_bands_and_alpha<Int16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case SIGNED_INT_32:
write_image_bands_and_alpha<Int32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case IEEE_FLOAT_32:
write_image_bands_and_alpha<float>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
case IEEE_FLOAT_64:
write_image_bands_and_alpha<double>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, image_rescaler,
alpha_upper_left, alpha_accessor, alpha_rescaler);
break;
default:
vigra_fail("vigra::detail::exportImageAlpha<non-scalar>: not reached");
}
}
else
{
switch (type)
{
case UNSIGNED_INT_8:
write_image_bands_and_alpha<UInt8>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case UNSIGNED_INT_16:
write_image_bands_and_alpha<UInt16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case UNSIGNED_INT_32:
write_image_bands_and_alpha<UInt32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case SIGNED_INT_16:
write_image_bands_and_alpha<Int16>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case SIGNED_INT_32:
write_image_bands_and_alpha<Int32>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case IEEE_FLOAT_32:
write_image_bands_and_alpha<float>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
case IEEE_FLOAT_64:
write_image_bands_and_alpha<double>(encoder.get(),
image_upper_left, image_lower_right, image_accessor, identity(),
alpha_upper_left, alpha_accessor, identity());
break;
default:
vigra_fail("vigra::detail::exportImageAlpha<non-scalar>: not reached");
}
}
encoder->close();
}
} // end namespace detail
/*!
* \brief Write the image specified by the given \ref
* vigra::ImageExportInfo object including an alpha channel.
*
* <B>Declarations</B>
*
* Pass arguments explicitly:
* \code
* namespace vigra {
* template <class ImageIterator, class ImageAccessor,
* class AlphaIterator, class AlphaAccessor>
* void
* exportImageAlpha(ImageIterator imageUpperLeft, ImageIterator imageLowerRight, ImageAccessor imageAccessor,
* AlphaIterator alphaUpperLeft, AlphaAccessor alphaAccessor,
* const ImageExportInfo& exportInfo)
* }
* \endcode
*
* Use argument objects in conjunction with \ref ArgumentObjectFactories :
* \code
* namespace vigra {
* template <class ImageIterator, class ImageAccessor,
* class AlphaIterator, class AlphaAccessor>
* void
* exportImageAlpha(const triple<ImageIterator, ImageIterator, ImageAccessor>& image,
* const pair<AlphaIterator, AlphaAccessor>& alpha,
* const ImageExportInfo& exportInfo)
* }
* \endcode
*
* <B>Usage</B>
*
* <B>\#include \<vigra/impexalpha.hxx\></B>
*
* Namespace: vigra
* \code
* typedef UInt8 value_t;
* ImageExportInfo info("zorro.tif");
*
* if (info.isGrayscale())
* {
* BasicImage<value_t> alpha;
* BasicImage<value_t> image;
*
* ...
*
* exportImageAlpha(image.upperLeft(), image.lowerRight(), image.accessor(),
* alpha.upperLeft(), alpha.accessor(),
* info);
* }
* else
* {
* BasicImage<value_t> alpha;
* BasicImage<vigra::RGBValue<value_t> > image;
*
* ...
*
* exportImageAlpha(image.upperLeft(), image.lowerRight(), image.accessor(),
* alpha.upperLeft(), alpha.accessor(),
* info);
* }
* \endcode
*
* <B>Preconditions</B>
*
* - The same preconditions hold as for exportImage(), however the
* only image formats that support alpha channels are
* + TIFF and
* + PNG.
* In particular, JPEG does <B>not</B> support alpha channels.
* - The alpha channel always is scalar-valued, i.e. comprises a
* single band.
*/
doxygen_overloaded_function(template <...> inline void exportImageAlpha)
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
inline void
exportImageAlpha(ImageIterator image_upper_left, ImageIterator image_lower_right, ImageAccessor image_accessor,
AlphaIterator alpha_upper_left, AlphaAccessor alpha_accessor,
const ImageExportInfo& export_info)
{
typedef typename ImageAccessor::value_type ImageValueType;
typedef typename vigra::NumericTraits<ImageValueType>::isScalar is_scalar;
try
{
detail::exportImageAlpha(image_upper_left, image_lower_right, image_accessor,
alpha_upper_left, alpha_accessor,
export_info,
is_scalar());
}
catch (Encoder::TIFFCompressionException&)
{
ImageExportInfo info(export_info);
info.setCompression("");
detail::exportImageAlpha(image_upper_left, image_lower_right, image_accessor,
alpha_upper_left, alpha_accessor,
info,
is_scalar());
}
}
template <class ImageIterator, class ImageAccessor,
class AlphaIterator, class AlphaAccessor>
inline void
exportImageAlpha(const vigra::triple<ImageIterator, ImageIterator, ImageAccessor>& image,
const vigra::pair<AlphaIterator, AlphaAccessor>& alpha,
const ImageExportInfo& export_info)
{
exportImageAlpha(image.first, image.second, image.third,
alpha.first, alpha.second,
export_info);
}
/** @} */
} // end namespace vigra
#endif // VIGRA_IMPEXALPHA_HXX
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