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bitmap_image.hpp
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bitmap_image.hpp
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/*
*****************************************************************************
* *
* Platform Independent *
* Bitmap Image Reader Writer Library *
* *
* Author: Arash Partow - 2002 *
* URL: http://partow.net/programming/bitmap/index.html *
* *
* Note: This library only supports 24-bits per pixel bitmap format files. *
* *
* Copyright notice: *
* Free use of the Platform Independent Bitmap Image Reader Writer Library *
* is permitted under the guidelines and in accordance with the most current *
* version of the MIT License. *
* http://www.opensource.org/licenses/MIT *
* *
*****************************************************************************
*/
#ifndef INCLUDE_BITMAP_IMAGE_HPP
#define INCLUDE_BITMAP_IMAGE_HPP
#include <algorithm>
#include <cmath>
#include <cstdlib>
#include <cstring>
#include <fstream>
#include <iostream>
#include <iterator>
#include <limits>
#include <string>
#include <vector>
class bitmap_image
{
public:
enum channel_mode {
rgb_mode = 0,
bgr_mode = 1
};
enum color_plane {
blue_plane = 0,
green_plane = 1,
red_plane = 2
};
struct rgb_t
{
unsigned char red;
unsigned char green;
unsigned char blue;
};
bitmap_image()
: file_name_(""),
width_ (0),
height_ (0),
row_increment_ (0),
bytes_per_pixel_(3),
channel_mode_(bgr_mode)
{}
bitmap_image(const std::string& filename)
: file_name_(filename),
width_ (0),
height_ (0),
row_increment_ (0),
bytes_per_pixel_(0),
channel_mode_(bgr_mode)
{
load_bitmap();
}
bitmap_image(const unsigned int width, const unsigned int height)
: file_name_(""),
width_ (width ),
height_(height),
row_increment_ (0),
bytes_per_pixel_(3),
channel_mode_(bgr_mode)
{
create_bitmap();
}
bitmap_image(const bitmap_image& image)
: file_name_(image.file_name_),
width_ (image.width_ ),
height_ (image.height_ ),
row_increment_ (0),
bytes_per_pixel_(3),
channel_mode_(bgr_mode)
{
create_bitmap();
data_ = image.data_;
}
bitmap_image& operator=(const bitmap_image& image)
{
if (this != &image)
{
file_name_ = image.file_name_;
bytes_per_pixel_ = image.bytes_per_pixel_;
width_ = image.width_;
height_ = image.height_;
row_increment_ = 0;
channel_mode_ = image.channel_mode_;
create_bitmap();
data_ = image.data_;
}
return *this;
}
inline bool operator!()
{
return (data_.size() == 0) ||
(width_ == 0) ||
(height_ == 0) ||
(row_increment_ == 0);
}
inline void clear(const unsigned char v = 0x00)
{
std::fill(data_.begin(), data_.end(), v);
}
inline unsigned char red_channel(const unsigned int x, const unsigned int y) const
{
return data_[(y * row_increment_) + (x * bytes_per_pixel_ + 2)];
}
inline unsigned char green_channel(const unsigned int x, const unsigned int y) const
{
return data_[(y * row_increment_) + (x * bytes_per_pixel_ + 1)];
}
inline unsigned char blue_channel (const unsigned int x, const unsigned int y) const
{
return data_[(y * row_increment_) + (x * bytes_per_pixel_ + 0)];
}
inline void red_channel(const unsigned int x, const unsigned int y, const unsigned char value)
{
data_[(y * row_increment_) + (x * bytes_per_pixel_ + 2)] = value;
}
inline void green_channel(const unsigned int x, const unsigned int y, const unsigned char value)
{
data_[(y * row_increment_) + (x * bytes_per_pixel_ + 1)] = value;
}
inline void blue_channel (const unsigned int x, const unsigned int y, const unsigned char value)
{
data_[(y * row_increment_) + (x * bytes_per_pixel_ + 0)] = value;
}
inline unsigned char* row(unsigned int row_index) const
{
return const_cast<unsigned char*>(&data_[(row_index * row_increment_)]);
}
inline void get_pixel(const unsigned int x, const unsigned int y,
unsigned char& red,
unsigned char& green,
unsigned char& blue) const
{
const unsigned int y_offset = y * row_increment_;
const unsigned int x_offset = x * bytes_per_pixel_;
const unsigned int offset = y_offset + x_offset;
blue = data_[offset + 0];
green = data_[offset + 1];
red = data_[offset + 2];
}
template <typename RGB>
inline void get_pixel(const unsigned int x, const unsigned int y, RGB& colour) const
{
get_pixel(x, y, colour.red, colour.green, colour.blue);
}
inline rgb_t get_pixel(const unsigned int x, const unsigned int y) const
{
rgb_t colour;
get_pixel(x, y, colour.red, colour.green, colour.blue);
return colour;
}
inline void set_pixel(const unsigned int x, const unsigned int y,
const unsigned char red,
const unsigned char green,
const unsigned char blue)
{
const unsigned int y_offset = y * row_increment_;
const unsigned int x_offset = x * bytes_per_pixel_;
const unsigned int offset = y_offset + x_offset;
data_[offset + 0] = blue;
data_[offset + 1] = green;
data_[offset + 2] = red;
}
template <typename RGB>
inline void set_pixel(const unsigned int x, const unsigned int y, const RGB& colour)
{
set_pixel(x, y, colour.red, colour.green, colour.blue);
}
inline bool copy_from(const bitmap_image& image)
{
if (
(image.height_ != height_) ||
(image.width_ != width_ )
)
{
return false;
}
data_ = image.data_;
return true;
}
inline bool copy_from(const bitmap_image& source_image,
const unsigned int& x_offset,
const unsigned int& y_offset)
{
if ((x_offset + source_image.width_ ) > width_ ) { return false; }
if ((y_offset + source_image.height_) > height_) { return false; }
for (unsigned int y = 0; y < source_image.height_; ++y)
{
unsigned char* itr1 = row(y + y_offset) + x_offset * bytes_per_pixel_;
const unsigned char* itr2 = source_image.row(y);
const unsigned char* itr2_end = itr2 + source_image.width_ * bytes_per_pixel_;
std::copy(itr2, itr2_end, itr1);
}
return true;
}
inline bool region(const unsigned int& x ,
const unsigned int& y ,
const unsigned int& width ,
const unsigned int& height,
bitmap_image& dest_image ) const
{
if ((x + width ) > width_ ) { return false; }
if ((y + height) > height_) { return false; }
if (
(dest_image.width_ < width_ ) ||
(dest_image.height_ < height_)
)
{
dest_image.setwidth_height(width,height);
}
for (unsigned int r = 0; r < height; ++r)
{
unsigned char* itr1 = row(r + y) + x * bytes_per_pixel_;
unsigned char* itr1_end = itr1 + (width * bytes_per_pixel_);
unsigned char* itr2 = dest_image.row(r);
std::copy(itr1, itr1_end, itr2);
}
return true;
}
inline bool roi_from_center(const unsigned int& cx ,
const unsigned int& cy ,
const unsigned int& width ,
const unsigned int& height,
bitmap_image& dest_image ) const
{
return region(cx - (width / 2), cy - (height / 2),
width, height,
dest_image);
}
inline bool set_region(const unsigned int& x ,
const unsigned int& y ,
const unsigned int& width ,
const unsigned int& height,
const unsigned char& value )
{
if ((x + width ) > width_ ) { return false; }
if ((y + height) > height_) { return false; }
for (unsigned int r = 0; r < height; ++r)
{
unsigned char* itr = row(r + y) + x * bytes_per_pixel_;
unsigned char* itr_end = itr + (width * bytes_per_pixel_);
std::fill(itr, itr_end, value);
}
return true;
}
inline bool set_region(const unsigned int& x ,
const unsigned int& y ,
const unsigned int& width ,
const unsigned int& height,
const color_plane color ,
const unsigned char& value )
{
if ((x + width ) > width_ ) { return false; }
if ((y + height) > height_) { return false; }
const unsigned int color_plane_offset = offset(color);
for (unsigned int r = 0; r < height; ++r)
{
unsigned char* itr = row(r + y) + x * bytes_per_pixel_ + color_plane_offset;
unsigned char* itr_end = itr + (width * bytes_per_pixel_);
while (itr != itr_end)
{
*itr = value;
itr += bytes_per_pixel_;
}
}
return true;
}
inline bool set_region(const unsigned int& x ,
const unsigned int& y ,
const unsigned int& width ,
const unsigned int& height,
const unsigned char& red ,
const unsigned char& green ,
const unsigned char& blue )
{
if ((x + width ) > width_ ) { return false; }
if ((y + height) > height_) { return false; }
for (unsigned int r = 0; r < height; ++r)
{
unsigned char* itr = row(r + y) + x * bytes_per_pixel_;
unsigned char* itr_end = itr + (width * bytes_per_pixel_);
while (itr != itr_end)
{
*(itr++) = blue;
*(itr++) = green;
*(itr++) = red;
}
}
return true;
}
void reflective_image(bitmap_image& image, const bool include_diagnols = false)
{
image.setwidth_height(3 * width_, 3 * height_, true);
image.copy_from(*this, width_, height_);
vertical_flip();
image.copy_from(*this, width_, 0);
image.copy_from(*this, width_, 2 * height_);
vertical_flip();
horizontal_flip();
image.copy_from(*this, 0, height_);
image.copy_from(*this, 2 * width_, height_);
horizontal_flip();
if (include_diagnols)
{
bitmap_image tile = *this;
tile.vertical_flip();
tile.horizontal_flip();
image.copy_from(tile, 0, 0);
image.copy_from(tile, 2 * width_, 0);
image.copy_from(tile, 2 * width_, 2 * height_);
image.copy_from(tile, 0 , 2 * height_);
}
}
inline unsigned int width() const
{
return width_;
}
inline unsigned int height() const
{
return height_;
}
inline unsigned int bytes_per_pixel() const
{
return bytes_per_pixel_;
}
inline unsigned int pixel_count() const
{
return width_ * height_;
}
inline void setwidth_height(const unsigned int width,
const unsigned int height,
const bool clear = false)
{
data_.clear();
width_ = width;
height_ = height;
create_bitmap();
if (clear)
{
std::fill(data_.begin(), data_.end(), static_cast<unsigned char>(0x00));
}
}
void save_image(const std::string& file_name) const
{
std::ofstream stream(file_name.c_str(),std::ios::binary);
if (!stream)
{
std::cerr << "bitmap_image::save_image(): Error - Could not open file "
<< file_name << " for writing!" << std::endl;
return;
}
bitmap_information_header bih;
bih.width = width_;
bih.height = height_;
bih.bit_count = static_cast<unsigned short>(bytes_per_pixel_ << 3);
bih.clr_important = 0;
bih.clr_used = 0;
bih.compression = 0;
bih.planes = 1;
bih.size = bih.struct_size();
bih.x_pels_per_meter = 0;
bih.y_pels_per_meter = 0;
bih.size_image = (((bih.width * bytes_per_pixel_) + 3) & 0x0000FFFC) * bih.height;
bitmap_file_header bfh;
bfh.type = 19778;
bfh.size = bfh.struct_size() + bih.struct_size() + bih.size_image;
bfh.reserved1 = 0;
bfh.reserved2 = 0;
bfh.off_bits = bih.struct_size() + bfh.struct_size();
write_bfh(stream,bfh);
write_bih(stream,bih);
unsigned int padding = (4 - ((3 * width_) % 4)) % 4;
char padding_data[4] = { 0x00, 0x00, 0x00, 0x00 };
for (unsigned int i = 0; i < height_; ++i)
{
const unsigned char* data_ptr = &data_[(row_increment_ * (height_ - i - 1))];
stream.write(reinterpret_cast<const char*>(data_ptr), sizeof(unsigned char) * bytes_per_pixel_ * width_);
stream.write(padding_data,padding);
}
stream.close();
}
inline void set_all_ith_bits_low(const unsigned int bitr_index)
{
unsigned char mask = static_cast<unsigned char>(~(1 << bitr_index));
for (unsigned char* itr = data(); itr != end(); ++itr)
{
*itr &= mask;
}
}
inline void set_all_ith_bits_high(const unsigned int bitr_index)
{
unsigned char mask = static_cast<unsigned char>(1 << bitr_index);
for (unsigned char* itr = data(); itr != end(); ++itr)
{
*itr |= mask;
}
}
inline void set_all_ith_channels(const unsigned int& channel, const unsigned char& value)
{
for (unsigned char* itr = (data() + channel); itr < end(); itr += bytes_per_pixel_)
{
*itr = value;
}
}
inline void set_channel(const color_plane color,const unsigned char& value)
{
for (unsigned char* itr = (data() + offset(color)); itr < end(); itr += bytes_per_pixel_)
{
*itr = value;
}
}
inline void ror_channel(const color_plane color, const unsigned int& ror)
{
for (unsigned char* itr = (data() + offset(color)); itr < end(); itr += bytes_per_pixel_)
{
*itr = static_cast<unsigned char>(((*itr) >> ror) | ((*itr) << (8 - ror)));
}
}
inline void set_all_channels(const unsigned char& value)
{
for (unsigned char* itr = data(); itr < end(); )
{
*(itr++) = value;
}
}
inline void set_all_channels(const unsigned char& r_value,
const unsigned char& g_value,
const unsigned char& b_value)
{
for (unsigned char* itr = (data() + 0); itr < end(); itr += bytes_per_pixel_)
{
*(itr + 0) = b_value;
*(itr + 1) = g_value;
*(itr + 2) = r_value;
}
}
inline void invert_color_planes()
{
for (unsigned char* itr = data(); itr < end(); *itr = ~(*itr), ++itr);
}
inline void add_to_color_plane(const color_plane color, const unsigned char& value)
{
for (unsigned char* itr = (data() + offset(color)); itr < end(); itr += bytes_per_pixel_)
{
(*itr) += value;
}
}
inline void convert_to_grayscale()
{
double r_scaler = 0.299;
double g_scaler = 0.587;
double b_scaler = 0.114;
if (rgb_mode == channel_mode_)
{
std::swap(r_scaler, b_scaler);
}
for (unsigned char* itr = data(); itr < end(); )
{
unsigned char gray_value = static_cast<unsigned char>
(
(r_scaler * (*(itr + 2))) +
(g_scaler * (*(itr + 1))) +
(b_scaler * (*(itr + 0)))
);
*(itr++) = gray_value;
*(itr++) = gray_value;
*(itr++) = gray_value;
}
}
inline const unsigned char* data() const
{
return data_.data();
}
inline unsigned char* data()
{
return const_cast<unsigned char*>(data_.data());
}
inline void bgr_to_rgb()
{
if ((bgr_mode == channel_mode_) && (3 == bytes_per_pixel_))
{
reverse_channels();
channel_mode_ = rgb_mode;
}
}
inline void rgb_to_bgr()
{
if ((rgb_mode == channel_mode_) && (3 == bytes_per_pixel_))
{
reverse_channels();
channel_mode_ = bgr_mode;
}
}
inline void reverse()
{
unsigned char* itr1 = data();
unsigned char* itr2 = end() - bytes_per_pixel_;
while (itr1 < itr2)
{
for (std::size_t i = 0; i < bytes_per_pixel_; ++i)
{
unsigned char* citr1 = itr1 + i;
unsigned char* citr2 = itr2 + i;
std::swap(*citr1,*citr2);
}
itr1 += bytes_per_pixel_;
itr2 -= bytes_per_pixel_;
}
}
inline void horizontal_flip()
{
for (unsigned int y = 0; y < height_; ++y)
{
unsigned char* itr1 = row(y);
unsigned char* itr2 = itr1 + row_increment_ - bytes_per_pixel_;
while (itr1 < itr2)
{
for (unsigned int i = 0; i < bytes_per_pixel_; ++i)
{
unsigned char* p1 = (itr1 + i);
unsigned char* p2 = (itr2 + i);
std::swap(*p1,*p2);
}
itr1 += bytes_per_pixel_;
itr2 -= bytes_per_pixel_;
}
}
}
inline void vertical_flip()
{
for (unsigned int y = 0; y < (height_ / 2); ++y)
{
unsigned char* itr1 = row(y);
unsigned char* itr2 = row(height_ - y - 1);
for (std::size_t x = 0; x < row_increment_; ++x)
{
std::swap(*(itr1 + x),*(itr2 + x));
}
}
}
inline void export_color_plane(const color_plane color, unsigned char* image)
{
for (unsigned char* itr = (data() + offset(color)); itr < end(); ++image, itr += bytes_per_pixel_)
{
(*image) = (*itr);
}
}
inline void export_color_plane(const color_plane color, bitmap_image& image)
{
if (
(width_ != image.width_ ) ||
(height_ != image.height_)
)
{
image.setwidth_height(width_,height_);
}
image.clear();
unsigned char* itr1 = (data() + offset(color));
unsigned char* itr1_end = end();
unsigned char* itr2 = (image.data() + offset(color));
while (itr1 < itr1_end)
{
(*itr2) = (*itr1);
itr1 += bytes_per_pixel_;
itr2 += bytes_per_pixel_;
}
}
inline void export_response_image(const color_plane color, double* response_image)
{
double* resp_itr = response_image;
for (unsigned char* itr = (data() + offset(color)); itr < end(); ++response_image, itr += bytes_per_pixel_)
{
*(resp_itr++) = (1.0 * (*itr)) / 256.0;
}
}
inline void export_gray_scale_response_image(double* response_image) const
{
double* resp_itr = response_image;
for (const unsigned char* itr = data(); itr < end(); itr += bytes_per_pixel_)
{
unsigned char gray_value = static_cast<unsigned char>
(
(0.299 * (*(itr + 2))) +
(0.587 * (*(itr + 1))) +
(0.114 * (*(itr + 0)))
);
*(resp_itr++) = (1.0 * gray_value) / 256.0;
}
}
inline void export_rgb(double* red, double* green, double* blue) const
{
if (bgr_mode != channel_mode_)
return;
for (const unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
(*blue ) = (1.0 * (*(itr++))) / 256.0;
(*green) = (1.0 * (*(itr++))) / 256.0;
(*red ) = (1.0 * (*(itr++))) / 256.0;
}
}
inline void export_rgb(float* red, float* green, float* blue) const
{
if (bgr_mode != channel_mode_)
return;
for (const unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
(*blue ) = (1.0f * (*(itr++))) / 256.0f;
(*green) = (1.0f * (*(itr++))) / 256.0f;
(*red ) = (1.0f * (*(itr++))) / 256.0f;
}
}
inline void export_rgb(unsigned char* red, unsigned char* green, unsigned char* blue) const
{
if (bgr_mode != channel_mode_)
return;
for (const unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
(*blue ) = *(itr++);
(*green) = *(itr++);
(*red ) = *(itr++);
}
}
inline void export_ycbcr(double* y, double* cb, double* cr) const
{
if (bgr_mode != channel_mode_)
return;
for (const unsigned char* itr = data(); itr < end(); ++y, ++cb, ++cr)
{
const double blue = (1.0 * (*(itr++)));
const double green = (1.0 * (*(itr++)));
const double red = (1.0 * (*(itr++)));
( *y) = clamp<double>( 16.0 + (1.0/256.0) * ( 65.738 * red + 129.057 * green + 25.064 * blue),1.0,254);
(*cb) = clamp<double>(128.0 + (1.0/256.0) * (- 37.945 * red - 74.494 * green + 112.439 * blue),1.0,254);
(*cr) = clamp<double>(128.0 + (1.0/256.0) * ( 112.439 * red - 94.154 * green - 18.285 * blue),1.0,254);
}
}
inline void export_rgb_normal(double* red, double* green, double* blue) const
{
if (bgr_mode != channel_mode_)
return;
for (const unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
(*blue ) = (1.0 * (*(itr++)));
(*green) = (1.0 * (*(itr++)));
(*red ) = (1.0 * (*(itr++)));
}
}
inline void export_rgb_normal(float* red, float* green, float* blue) const
{
if (bgr_mode != channel_mode_)
return;
for (const unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
(*blue ) = (1.0f * (*(itr++)));
(*green) = (1.0f * (*(itr++)));
(*red ) = (1.0f * (*(itr++)));
}
}
inline void import_rgb(double* red, double* green, double* blue)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
*(itr++) = static_cast<unsigned char>(256.0 * (*blue ));
*(itr++) = static_cast<unsigned char>(256.0 * (*green));
*(itr++) = static_cast<unsigned char>(256.0 * (*red ));
}
}
inline void import_rgb(float* red, float* green, float* blue)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
*(itr++) = static_cast<unsigned char>(256.0f * (*blue ));
*(itr++) = static_cast<unsigned char>(256.0f * (*green));
*(itr++) = static_cast<unsigned char>(256.0f * (*red ));
}
}
inline void import_rgb(unsigned char* red, unsigned char* green, unsigned char* blue)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
*(itr++) = (*blue );
*(itr++) = (*green);
*(itr++) = (*red );
}
}
inline void import_ycbcr(double* y, double* cb, double* cr)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++y, ++cb, ++cr)
{
double y_ = (*y);
double cb_ = (*cb);
double cr_ = (*cr);
*(itr++) = static_cast<unsigned char>(clamp((298.082 * y_ + 516.412 * cb_ ) / 256.0 - 276.836,0.0,255.0));
*(itr++) = static_cast<unsigned char>(clamp((298.082 * y_ - 100.291 * cb_ - 208.120 * cr_ ) / 256.0 + 135.576,0.0,255.0));
*(itr++) = static_cast<unsigned char>(clamp((298.082 * y_ + 408.583 * cr_ ) / 256.0 - 222.921,0.0,255.0));
}
}
inline void import_gray_scale_clamped(double* gray)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++gray)
{
unsigned char c = static_cast<unsigned char>(clamp<double>(256.0 * (*gray),0.0,255.0));
*(itr + 0) = c;
*(itr + 1) = c;
*(itr + 2) = c;
itr += 3;
}
}
inline void import_rgb_clamped(double* red, double* green, double* blue)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
*(itr++) = static_cast<unsigned char>(clamp<double>(256.0 * (*blue ),0.0,255.0));
*(itr++) = static_cast<unsigned char>(clamp<double>(256.0 * (*green),0.0,255.0));
*(itr++) = static_cast<unsigned char>(clamp<double>(256.0 * (*red ),0.0,255.0));
}
}
inline void import_rgb_clamped(float* red, float* green, float* blue)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
*(itr++) = static_cast<unsigned char>(clamp<double>(256.0f * (*blue ),0.0,255.0));
*(itr++) = static_cast<unsigned char>(clamp<double>(256.0f * (*green),0.0,255.0));
*(itr++) = static_cast<unsigned char>(clamp<double>(256.0f * (*red ),0.0,255.0));
}
}
inline void import_rgb_normal(double* red, double* green, double* blue)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
*(itr++) = static_cast<unsigned char>(*blue );
*(itr++) = static_cast<unsigned char>(*green);
*(itr++) = static_cast<unsigned char>(*red );
}
}
inline void import_rgb_normal(float* red, float* green, float* blue)
{
if (bgr_mode != channel_mode_)
return;
for (unsigned char* itr = data(); itr < end(); ++red, ++green, ++blue)
{
*(itr++) = static_cast<unsigned char>(*blue );
*(itr++) = static_cast<unsigned char>(*green);
*(itr++) = static_cast<unsigned char>(*red );
}
}
inline void subsample(bitmap_image& dest) const
{
/*
Half sub-sample of original image.
*/
unsigned int w = 0;
unsigned int h = 0;
bool odd_width = false;
bool odd_height = false;
if (0 == (width_ % 2))
w = width_ / 2;
else
{
w = 1 + (width_ / 2);
odd_width = true;
}
if (0 == (height_ % 2))
h = height_ / 2;
else
{
h = 1 + (height_ / 2);
odd_height = true;
}
unsigned int horizontal_upper = (odd_width) ? (w - 1) : w;
unsigned int vertical_upper = (odd_height) ? (h - 1) : h;
dest.setwidth_height(w,h);
dest.clear();
unsigned char* s_itr[3];
const unsigned char* itr1[3];
const unsigned char* itr2[3];
s_itr[0] = dest.data() + 0;
s_itr[1] = dest.data() + 1;
s_itr[2] = dest.data() + 2;
itr1[0] = data() + 0;
itr1[1] = data() + 1;
itr1[2] = data() + 2;
itr2[0] = data() + row_increment_ + 0;
itr2[1] = data() + row_increment_ + 1;
itr2[2] = data() + row_increment_ + 2;
unsigned int total = 0;
for (unsigned int j = 0; j < vertical_upper; ++j)
{
for (unsigned int i = 0; i < horizontal_upper; ++i)
{
for (unsigned int k = 0; k < bytes_per_pixel_; s_itr[k] += bytes_per_pixel_, ++k)
{
total = 0;
total += *(itr1[k]);
total += *(itr1[k]);
total += *(itr2[k]);
total += *(itr2[k]);
itr1[k] += bytes_per_pixel_;
itr1[k] += bytes_per_pixel_;