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Merge pull request #3912 from mapycz/fix-overviews

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GDAL: Fixes of overviews
This commit is contained in:
Artem Pavlenko 2018-07-02 09:49:46 +02:00 committed by GitHub
commit 9e3014494c
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GPG key ID: 4AEE18F83AFDEB23
4 changed files with 66 additions and 55 deletions
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111
plugins/input/gdal/gdal_featureset.cpp
View file

@ -124,6 +124,33 @@ feature_ptr gdal_featureset::next()
return feature_ptr();
}
void gdal_featureset::find_best_overview(int bandNumber,
int ideal_width,
int ideal_height,
int & current_width,
int & current_height) const
{
GDALRasterBand * band = dataset_.GetRasterBand(bandNumber);
int band_overviews = band->GetOverviewCount();
if (band_overviews > 0)
{
for (int b = 0; b < band_overviews; b++)
{
GDALRasterBand * overview = band->GetOverview(b);
int overview_width = overview->GetXSize();
int overview_height = overview->GetYSize();
if ((overview_width < current_width ||
overview_height < current_height) &&
ideal_width <= overview_width &&
ideal_height <= overview_height)
{
current_width = overview_width;
current_height = overview_height;
}
}
}
}
feature_ptr gdal_featureset::get_feature(mapnik::query const& q)
{
feature_ptr feature = feature_factory::create(ctx_,1);
@ -206,77 +233,55 @@ feature_ptr gdal_featureset::get_feature(mapnik::query const& q)
int im_width = width;
double im_offset_x = x_off;
double im_offset_y = y_off;
int current_width = (int)raster_width_;
int current_height = (int)raster_height_;
int current_width = static_cast<int>(raster_width_);
int current_height = static_cast<int>(raster_height_);
// loop through overviews -- snap up in resolution to closest overview
// if necessary we find an image size that most resembles
// the resolution of our output image.
const double width_res = std::get<0>(q.resolution());
const double height_res = std::get<1>(q.resolution());
const int ideal_raster_width = static_cast<int>(
std::floor(raster_extent_.width() *
width_res * filter_factor) + .5);
const int ideal_raster_height = static_cast<int>(
std::floor(raster_extent_.height() *
height_res * filter_factor) + .5);
// loop through overviews -- snap up in resolution to closest overview if necessary
// we find an image size that most resembles the resolution of our output image.
double width_res = std::get<0>(q.resolution());
double height_res = std::get<1>(q.resolution());
int res_adjusted_raster_width = static_cast<int>(std::floor(((double)raster_width_ * width_res) + .5));
int res_adjusted_raster_height = static_cast<int>(std::floor(((double)raster_height_ * height_res) + .5));
if (band_ > 0 && band_ < nbands_)
{
GDALRasterBand * band = dataset_.GetRasterBand(band_);
int band_overviews = band->GetOverviewCount();
if (band_overviews > 0)
{
for (int b = 0; b < band_overviews; b++)
{
GDALRasterBand * overview = band->GetOverview(b);
int overview_width = overview->GetXSize();
int overview_height = overview->GetYSize();
if ((overview_width < current_width || overview_height < current_height) &&
res_adjusted_raster_width <= overview_width &&
res_adjusted_raster_height <= overview_height)
{
current_width = overview_width;
current_height = overview_height;
}
}
}
find_best_overview(band_,
ideal_raster_width,
ideal_raster_height,
current_width,
current_height);
}
else
{
for (int i = 0; i < nbands_; ++i)
{
GDALRasterBand * band = dataset_.GetRasterBand(i + 1);
int band_overviews = band->GetOverviewCount();
if (band_overviews > 0)
{
for (int b = 0; b < band_overviews; b++)
{
GDALRasterBand * overview = band->GetOverview(b);
int overview_width = overview->GetXSize();
int overview_height = overview->GetYSize();
if ((overview_width < current_width || overview_height < current_height) &&
res_adjusted_raster_width <= overview_width &&
res_adjusted_raster_height <= overview_height)
{
current_width = overview_width;
current_height = overview_height;
}
}
}
find_best_overview(i + 1,
ideal_raster_width,
ideal_raster_height,
current_width,
current_height);
}
}
if (current_width != (int)raster_width_ || current_height != (int)raster_height_)
if (current_width != (int)raster_width_ ||
current_height != (int)raster_height_)
{
if (current_width != (int)raster_width_)
{
double ratio = (double)current_width / (double)raster_width_;
int adjusted_width = static_cast<int>(std::floor((ratio * im_width) + 0.5));
double adjusted_ratio = (double)adjusted_width / (double)im_width;
im_offset_x = adjusted_ratio * im_offset_x;
im_width = adjusted_width;
im_offset_x = std::floor(ratio * im_offset_x);
im_width = static_cast<int>(std::ceil(ratio * im_width));
}
if (current_height != (int)raster_height_)
{
double ratio = (double)current_height / (double)raster_height_;
int adjusted_height = static_cast<int>(std::floor((ratio * im_height) + 0.5));
double adjusted_ratio = (double)adjusted_height / (double)im_height;
im_offset_y = adjusted_ratio * im_offset_y;
im_height = adjusted_height;
im_offset_y = std::floor(ratio * im_offset_y);
im_height = static_cast<int>(std::ceil(ratio * im_height));
}
}

6
plugins/input/gdal/gdal_featureset.hpp
View file

@ -72,6 +72,12 @@ public:
mapnik::feature_ptr next();
private:
void find_best_overview(int bandNumber,
int ideal_width,
int ideal_height,
int & current_width,
int & current_height) const;
mapnik::feature_ptr get_feature(mapnik::query const& q);
mapnik::feature_ptr get_feature_at_point(mapnik::coord2d const& p);
GDALDataset & dataset_;

2
test/data

@ -1 +1 @@
Subproject commit 0c278955e867f9b88abb6bcd5a2aa3ee76e870c1
Subproject commit 049658fa104f368f78c3e8d9bddd50719492bcd5

2
test/data-visual

@ -1 +1 @@
Subproject commit 23034ae27fb0b00d202688865268a80d05065fcc
Subproject commit 574ad9bf84450708a7f8befa63dddbc0a377cfa5