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#include <mbgl/sprite/sprite_parser.hpp>
#include <mbgl/style/image.hpp>
#include <mbgl/style/image_impl.hpp>
#include <mbgl/util/exception.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/util/image.hpp>
#include <mbgl/util/rapidjson.hpp>
#include <mbgl/util/string.hpp>
#include <algorithm>
#include <cmath>
#include <limits>
namespace mbgl {
std::unique_ptr<style::Image> createStyleImage(const std::string& id,
const PremultipliedImage& image,
const int32_t srcX,
const int32_t srcY,
const int32_t width,
const int32_t height,
const double ratio,
const bool sdf,
style::ImageStretches&& stretchX,
style::ImageStretches&& stretchY,
const optional<style::ImageContent>& content) {
// Disallow invalid parameter configurations.
if (width <= 0 || height <= 0 || width > 1024 || height > 1024 || ratio <= 0 || ratio > 10 || srcX < 0 ||
srcY < 0 || srcX >= static_cast<int32_t>(image.size.width) || srcY >= static_cast<int32_t>(image.size.height) ||
srcX + width > static_cast<int32_t>(image.size.width) ||
srcY + height > static_cast<int32_t>(image.size.height)) {
Log::Error(Event::Sprite,
"Can't create image with invalid metrics: %dx%d@%d,%d in %ux%u@%sx sprite",
width,
height,
srcX,
srcY,
image.size.width,
image.size.height,
util::toString(ratio).c_str());
return nullptr;
}
const Size size(static_cast<uint32_t>(width), static_cast<uint32_t>(height));
PremultipliedImage dstImage(size);
// Copy from the source image into our individual sprite image
PremultipliedImage::copy(image, dstImage, {static_cast<uint32_t>(srcX), static_cast<uint32_t>(srcY)}, {0, 0}, size);
try {
return std::make_unique<style::Image>(
id, std::move(dstImage), ratio, sdf, std::move(stretchX), std::move(stretchY), content);
} catch (const util::StyleImageException& ex) {
Log::Error(Event::Sprite, "Can't create image with invalid metadata: %s", ex.what());
return nullptr;
}
}
namespace {
uint16_t getUInt16(const JSValue& value, const char* property, const char* name, const uint16_t def = 0) {
if (value.HasMember(property)) {
auto& v = value[property];
if (v.IsUint() && v.GetUint() <= std::numeric_limits<uint16_t>::max()) {
return v.GetUint();
} else {
Log::Warning(Event::Sprite,
"Invalid sprite image '%s': value of '%s' must be an integer between 0 and 65535",
name,
property);
}
}
return def;
}
double getDouble(const JSValue& value, const char* property, const char* name, const double def = 0) {
if (value.HasMember(property)) {
auto& v = value[property];
if (v.IsNumber()) {
return v.GetDouble();
} else {
Log::Warning(Event::Sprite, "Invalid sprite image '%s': value of '%s' must be a number", name, property);
}
}
return def;
}
bool getBoolean(const JSValue& value, const char* property, const char* name, const bool def = false) {
if (value.HasMember(property)) {
auto& v = value[property];
if (v.IsBool()) {
return v.GetBool();
} else {
Log::Warning(Event::Sprite, "Invalid sprite image '%s': value of '%s' must be a boolean", name, property);
}
}
return def;
}
style::ImageStretches getStretches(const JSValue& value, const char* property, const char* name) {
style::ImageStretches stretches;
if (value.HasMember(property)) {
auto& v = value[property];
if (v.IsArray()) {
for (rapidjson::SizeType i = 0; i < v.Size(); ++i) {
const JSValue& stretch = v[i];
if (stretch.IsArray() && stretch.Size() == 2 && stretch[rapidjson::SizeType(0)].IsNumber() &&
stretch[rapidjson::SizeType(1)].IsNumber()) {
stretches.emplace_back(style::ImageStretch{stretch[rapidjson::SizeType(0)].GetFloat(),
stretch[rapidjson::SizeType(1)].GetFloat()});
} else {
Log::Warning(Event::Sprite,
"Invalid sprite image '%s': members of '%s' must be an array of two numbers",
name,
property);
}
}
} else {
Log::Warning(Event::Sprite, "Invalid sprite image '%s': value of '%s' must be an array", name, property);
}
}
return stretches;
}
optional<style::ImageContent> getContent(const JSValue& value, const char* property, const char* name) {
if (value.HasMember(property)) {
auto& content = value[property];
if (content.IsArray() && content.Size() == 4 && content[rapidjson::SizeType(0)].IsNumber() &&
content[rapidjson::SizeType(1)].IsNumber() && content[rapidjson::SizeType(2)].IsNumber() &&
content[rapidjson::SizeType(3)].IsNumber()) {
return style::ImageContent{content[rapidjson::SizeType(0)].GetFloat(),
content[rapidjson::SizeType(1)].GetFloat(),
content[rapidjson::SizeType(2)].GetFloat(),
content[rapidjson::SizeType(3)].GetFloat()};
} else {
Log::Warning(Event::Sprite,
"Invalid sprite image '%s': value of '%s' must be an array of four numbers",
name,
property);
}
}
return nullopt;
}
} // namespace
std::vector<Immutable<style::Image::Impl>> parseSprite(const std::string& encodedImage, const std::string& json) {
const PremultipliedImage raster = decodeImage(encodedImage);
JSDocument doc;
doc.Parse<0>(json.c_str());
if (doc.HasParseError()) {
throw std::runtime_error("Failed to parse JSON: " + formatJSONParseError(doc));
}
if (!doc.IsObject()) {
throw std::runtime_error("Sprite JSON root must be an object");
}
const auto& properties = doc.GetObject();
std::vector<Immutable<style::Image::Impl>> images;
images.reserve(properties.MemberCount());
for (const auto& property : properties) {
const std::string name = {property.name.GetString(), property.name.GetStringLength()};
const JSValue& value = property.value;
if (value.IsObject()) {
const uint16_t x = getUInt16(value, "x", name.c_str(), 0);
const uint16_t y = getUInt16(value, "y", name.c_str(), 0);
const uint16_t width = getUInt16(value, "width", name.c_str(), 0);
const uint16_t height = getUInt16(value, "height", name.c_str(), 0);
const double pixelRatio = getDouble(value, "pixelRatio", name.c_str(), 1);
const bool sdf = getBoolean(value, "sdf", name.c_str(), false);
style::ImageStretches stretchX = getStretches(value, "stretchX", name.c_str());
style::ImageStretches stretchY = getStretches(value, "stretchY", name.c_str());
optional<style::ImageContent> content = getContent(value, "content", name.c_str());
auto image = createStyleImage(
name, raster, x, y, width, height, pixelRatio, sdf, std::move(stretchX), std::move(stretchY), content);
if (image) {
images.push_back(std::move(image->baseImpl));
}
}
}
assert([&images] {
std::sort(images.begin(), images.end());
return std::unique(images.begin(), images.end()) == images.end();
}());
return images;
}
} // namespace mbgl
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