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#include <mapbox/geometry/box.hpp>
#include <mbgl/storage/resource.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/token.hpp>
#include <mbgl/util/url.hpp>
#include <cmath>
namespace mbgl {
static std::string getQuadKey(int32_t x, int32_t y, int8_t z) {
std::string quadKey;
quadKey.reserve(z);
int32_t mask;
for (int8_t i = z; i > 0; i--) {
mask = 1 << (i - 1);
quadKey += '0' + ((x & mask ? 1 : 0) + (y & mask ? 2 : 0));
}
return quadKey;
}
static mapbox::geometry::point<double> getMercCoord(int32_t x, int32_t y, int8_t z) {
double resolution = (util::M2PI * util::EARTH_RADIUS_M / 256) / std::pow(2.0f, z);
return {
x * resolution - util::M2PI * util::EARTH_RADIUS_M / 2,
y * resolution - util::M2PI * util::EARTH_RADIUS_M / 2,
};
}
static std::string getTileBBox(int32_t x, int32_t y, int8_t z) {
// Alter the y for the Google/OSM tile scheme.
y = std::pow(2.0f, z) - y - 1;
auto min = getMercCoord(x * 256, y * 256, z);
auto max = getMercCoord((x + 1) * 256, (y + 1) * 256, z);
return (util::toString(min.x) + "," + util::toString(min.y) + "," +
util::toString(max.x) + "," + util::toString(max.y));
}
Resource Resource::style(const std::string& url) {
return Resource {
Resource::Kind::Style,
url
};
}
Resource Resource::source(const std::string& url) {
return Resource {
Resource::Kind::Source,
url
};
}
Resource Resource::image(const std::string& url) {
return Resource {
Resource::Kind::Image,
url
};
}
Resource Resource::spriteImage(const std::string& base, float pixelRatio) {
return Resource {
Resource::Kind::SpriteImage,
base + (pixelRatio > 1 ? "@2x" : "") + ".png"
};
}
Resource Resource::spriteJSON(const std::string& base, float pixelRatio) {
return Resource {
Resource::Kind::SpriteJSON,
base + (pixelRatio > 1 ? "@2x" : "") + ".json"
};
}
Resource Resource::glyphs(const std::string& urlTemplate, const FontStack& fontStack, const std::pair<uint16_t, uint16_t>& glyphRange) {
return Resource {
Resource::Kind::Glyphs,
util::replaceTokens(urlTemplate, [&](const std::string& token) {
if (token == "fontstack") {
return util::percentEncode(fontStackToString(fontStack));
} else if (token == "range") {
return util::toString(glyphRange.first) + "-" + util::toString(glyphRange.second);
} else {
return std::string();
}
})
};
}
Resource Resource::tile(const std::string& urlTemplate,
float pixelRatio,
int32_t x,
int32_t y,
int8_t z,
Tileset::Scheme scheme,
LoadingMethod loadingMethod) {
bool supportsRatio = urlTemplate.find("{ratio}") != std::string::npos;
if (scheme == Tileset::Scheme::TMS) {
y = (1 << z) - y - 1;
}
return Resource {
Resource::Kind::Tile,
util::replaceTokens(urlTemplate, [&](const std::string& token) {
if (token == "z") {
return util::toString(z);
} else if (token == "x") {
return util::toString(x);
} else if (token == "y") {
return util::toString(y);
} else if (token == "quadkey") {
return getQuadKey(x, y, z);
} else if (token == "bbox-epsg-3857") {
return getTileBBox(x, y, z);
} else if (token == "prefix") {
std::string prefix{ 2 };
prefix[0] = "0123456789abcdef"[x % 16];
prefix[1] = "0123456789abcdef"[y % 16];
return prefix;
} else if (token == "ratio") {
return std::string(pixelRatio > 1.0 ? "@2x" : "");
} else {
return std::string();
}
}),
Resource::TileData {
urlTemplate,
uint8_t(supportsRatio && pixelRatio > 1.0 ? 2 : 1),
x,
y,
z
},
loadingMethod
};
}
} // namespace mbgl
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