inline void boost::gil::rescale(const SrcView& src, const DstView& dst, const Filter& filter)
{
typedef typename SrcView::value_type src_pixel_t;
typedef typename gil::detail::create_accum_pixel_type<src_pixel_t>::type accum_pixel_t;
// construct weights tables
detail::weight_table horizontal_weights;
horizontal_weights.reset(filter, src.width(), dst.width());
detail::weight_table vertical_weights;
vertical_weights.reset(filter, src.height(), dst.height());
// allocate intermediary pixels row
std::vector<accum_pixel_t> intermediate_row( src.width() );
typedef typename DstView::coord_t coord_t;
coord_t const src_width = src.width();
coord_t const dst_height = dst.height();
for (coord_t y=0; y<dst_height; y++)
{
// create the intermediate row by vertically sampling the source image pixels
detail::weight_table::const_iterator const vtable_begin = vertical_weights.begin() + y;
detail::weight_table::const_iterator const vtable_end = vtable_begin + 1;
for (coord_t x=0; x<src_width; x++)
{
detail::rescale_line<accum_pixel_t>(
src.col_begin(x)
, intermediate_row.begin() + x
, vtable_begin
, vtable_end
);
}
// scale horizontally the intermediate row into the destination row
detail::weight_table::const_iterator const htable_begin = horizontal_weights.begin();
detail::weight_table::const_iterator const htable_end = horizontal_weights.end();
detail::rescale_line<accum_pixel_t>(
intermediate_row.begin()
, dst.row_begin(y)
, htable_begin
, htable_end
);
}
}
void blur(const SrcView& src, const DstView& dst) {
typedef typename channel_type<DstView>::type dst_channel_t;
int max_x = src.width() - 1;
int width = src.width();
for (int y=1; y<src.height()-1; ++y) {
typename SrcView::x_iterator src_it = src.row_begin(y);
typename DstView::x_iterator dst_it = dst.row_begin(y);
for (int x=1; x < max_x; ++x) {
for (int c=0; c< num_channels<rgb8_view_t>::value; ++c) {
dst_it[x][c] =
src_it[x-1-width][c] / 16 +
src_it[x-width][c] / 8 +
src_it[x-1-width][c] / 16 +
src_it[x-1][c] / 8 +
src_it[x][c] / 4 +
src_it[x-1][c] / 8 +
src_it[x-1+width][c] / 16 +
src_it[x+width][c] / 8 +
src_it[x-1+width][c] / 16;
}
}
}
}
void sobel_xy(const SrcView& src, const DstView& dst) {
typedef typename channel_type<DstView>::type dst_channel_t;
int max_x = src.width() - 1;
int width = src.width();
for (int y=1; y<src.height()-1; ++y) {
typename SrcView::x_iterator src_it = src.row_begin(y);
typename DstView::x_iterator dst_it = dst.row_begin(y);
for (int x=1; x < max_x; ++x) {
for (int c=0; c< num_channels<rgb8_view_t>::value; ++c) {
dst_channel_t srcPlus1 = src_it[x+width][c]; //TODO should be replaced by line length
dst_channel_t srcMinus1 = src_it[x-width][c];
dst_channel_t sobelY = (srcPlus1 > srcMinus1) ?
srcPlus1 - srcMinus1 :
srcMinus1 - srcPlus1;
srcPlus1 = src_it[x+1][c];
srcMinus1 = src_it[x-1][c];
dst_channel_t sobelX = (srcPlus1 > srcMinus1) ?
srcPlus1 - srcMinus1 :
srcMinus1 - srcPlus1;
dst_it[x][c] = max(sobelX, sobelY);
}
}
}
}
inline void boost::gil::rescale_rows(const SrcView& src, const DstView& dst, const Filter& filter)
{
typedef typename SrcView::value_type src_pixel_t;
typedef typename gil::detail::create_accum_pixel_type<src_pixel_t>::type accum_pixel_t;
if (src.width() != dst.width())
{
throw std::runtime_error("rescale_rows: width of source and destination views must match");
}
detail::weight_table weights;
weights.reset(filter, src.height(), dst.height());
detail::weight_table::const_iterator const table_begin = weights.begin();
detail::weight_table::const_iterator const table_end = weights.end();
typedef typename DstView::coord_t coord_t;
coord_t const width = dst.width();
for (coord_t x=0; x<width; x++)
{
detail::rescale_line<accum_pixel_t>(
src.col_begin(x)
, dst.col_begin(x)
, table_begin
, table_end
);
}
}
bool sample(nearest_neighbor_sampler, const SrcView& src, const point2<F>& p, DstP& result) {
typename SrcView::point_t center(iround(p));
if (center.x>=0 && center.y>=0 && center.x<src.width() && center.y<src.height()) {
result=src(center.x,center.y);
return true;
}
return false;
}
bool sample(nearest_neighbor_sampler, const SrcView& src, const point2<F>& p, DstP& result) {
///modif Adrien pour 64 bits : ptrdiff au lieu d'int
point2<std::ptrdiff_t> center(iround(p));
if (center.x>=0 && center.y>=0 && center.x<src.width() && center.y<src.height()) {
result=src(center.x,center.y);
return true;
}
return false;
}
bool sample(bilinear_sampler, const SrcView& src, const point2<F>& p, DstP& result) {
typedef typename SrcView::value_type SrcP;
///modif
point2<std::ptrdiff_t> p0(ifloor(p)); // the closest integer coordinate top left from p
point2<F> frac(p.x-p0.x, p.y-p0.y);
if (p0.x < 0 || p0.y < 0 || p0.x>=src.width() || p0.y>=src.height()) return false;
pixel<F,devicen_layout_t<num_channels<SrcView>::value> > mp(0); // suboptimal
typename SrcView::xy_locator loc=src.xy_at(p0.x,p0.y);
if (p0.x+1<src.width()) {
if (p0.y+1<src.height()) {
// most common case - inside the image, not on the last row or column
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(*loc, (1-frac.x)*(1-frac.y),mp);
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(loc.x()[1], frac.x *(1-frac.y),mp);
++loc.y();
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(*loc, (1-frac.x)* frac.y ,mp);
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(loc.x()[1], frac.x * frac.y ,mp);
} else {
// on the last row, but not the bottom-right corner pixel
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(*loc, (1-frac.x),mp);
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(loc.x()[1], frac.x ,mp);
}
} else {
if (p0.y+1<src.height()) {
// on the last column, but not the bottom-right corner pixel
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(*loc, (1-frac.y),mp);
++loc.y();
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(*loc, frac.y ,mp);
} else {
// the bottom-right corner pixel
detail::add_dst_mul_src<SrcP,F,pixel<F,devicen_layout_t<num_channels<SrcView>::value> > >()(*loc,1,mp);
}
}
// Convert from floating point average value to the source type
SrcP src_result;
cast_pixel(mp,src_result);
color_convert(src_result, result);
return true;
}
void x_gradient(const SrcView& src, const DstView& dst) {
typedef typename channel_type<DstView>::type dst_channel_t;
for (int y=0; y<src.height(); ++y) {
typename SrcView::x_iterator src_it = src.row_begin(y);
typename DstView::x_iterator dst_it = dst.row_begin(y);
for (int x=1; x<src.width()-1; ++x)
static_transform(src_it[x-1], src_it[x+1], dst_it[x],
halfdiff_cast_channels<dst_channel_t>());
}
}
void x_gradient(const SrcView& src, const DstView& dst) {
int max_x = src.width()-1;
for (int y=0; y<src.height(); ++y) {
typename SrcView::x_iterator src_it = src.row_begin(y);
typename DstView::x_iterator dst_it = dst.row_begin(y);
for (int x=1; x < max_x; ++x) {
for (int c=0; c< num_channels<rgb8_view_t>::value; ++c) {
dst_it[x][c] = (src_it[x+1][c] - src_it[x-1][c])/2;
}
}
}
}
void grayToRgbView(const SrcView& src, const DstView& dst) {
typedef typename channel_type<DstView>::type dst_channel_t;
int width = src.width();
for (int y=0; y< src.height(); ++y) {
typename SrcView::x_iterator src_it = src.row_begin(y);
typename DstView::x_iterator dst_it = dst.row_begin(y);
for (int x=0; x < width; ++x) {
dst_channel_t grayValue = (dst_channel_t) src_it[x];
for (int c=0; c< num_channels<rgb8_view_t>::value; ++c) {
dst_it[x][c] = grayValue;
}
}
}
}
void rgbToGrayView(const SrcView& src, const DstView& dst) {
typedef typename channel_type<DstView>::type dst_channel_t;
int width = src.width();
for (int y=0; y< src.height(); ++y) {
typename SrcView::x_iterator src_it = src.row_begin(y);
typename DstView::x_iterator dst_it = dst.row_begin(y);
for (int x=0; x < width; ++x) {
int combination = 0;
for (int c=0; c< num_channels<rgb8_view_t>::value; ++c) {
combination += src_it[x][c] * RGB_TO_GRAY_INT[c];
}
dst_it[x] = (dst_channel_t) (combination / 100);
}
}
}
void sobel_x(const SrcView& src, const DstView& dst) {
typedef typename channel_type<DstView>::type dst_channel_t;
int max_x = src.width()-1;
for (int y=0; y<src.height(); ++y) {
typename SrcView::x_iterator src_it = src.row_begin(y);
typename DstView::x_iterator dst_it = dst.row_begin(y);
for (int x=1; x < max_x; ++x) {
for (int c=0; c< num_channels<rgb8_view_t>::value; ++c) {
dst_channel_t srcPlus1 = src_it[x+1][c];
dst_channel_t srcMinus1 = src_it[x-1][c];
dst_it[x][c] = (srcPlus1 > srcMinus1) ?
srcPlus1 - srcMinus1 :
srcMinus1 - srcPlus1;
}
}
}
}