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#include <mbgl/sprite/sprite_parser.hpp>
#include <mbgl/sprite/sprite_image.hpp>
#include <mbgl/platform/log.hpp>
#include <mbgl/util/image.hpp>
#include <mbgl/util/rapidjson.hpp>
#include <cmath>
#include <limits>
#include <sstream>
namespace mbgl {
SpriteImagePtr createSpriteImage(const PremultipliedImage& image,
const uint16_t srcX,
const uint16_t srcY,
const uint16_t width,
const uint16_t height,
const double ratio,
const bool sdf) {
// Disallow invalid parameter configurations.
if (width <= 0 || height <= 0 || width > 1024 || height > 1024 ||
ratio <= 0 || ratio > 10 ||
srcX + width > image.width || srcY + height > image.height) {
Log::Error(Event::Sprite, "Can't create sprite with invalid metrics");
return nullptr;
}
PremultipliedImage dstImage(width, height);
auto srcData = reinterpret_cast<const uint32_t*>(image.data.get());
auto dstData = reinterpret_cast<uint32_t*>(dstImage.data.get());
// Copy from the source image into our individual sprite image
for (uint16_t y = 0; y < height; ++y) {
const auto dstRow = y * width;
const auto srcRow = (y + srcY) * image.width + srcX;
for (uint16_t x = 0; x < width; ++x) {
dstData[dstRow + x] = srcData[srcRow + x];
}
}
return std::make_unique<const SpriteImage>(std::move(dstImage), ratio, sdf);
}
namespace {
uint16_t getUInt16(const JSValue& value, const char* name, const uint16_t def = 0) {
if (value.HasMember(name)) {
auto& v = value[name];
if (v.IsUint() && v.GetUint() <= std::numeric_limits<uint16_t>::max()) {
return v.GetUint();
} else {
Log::Warning(Event::Sprite, "Value of '%s' must be an integer between 0 and 65535",
name);
}
}
return def;
}
double getDouble(const JSValue& value, const char* name, const double def = 0) {
if (value.HasMember(name)) {
auto& v = value[name];
if (v.IsNumber()) {
return v.GetDouble();
} else {
Log::Warning(Event::Sprite, "Value of '%s' must be a number", name);
}
}
return def;
}
bool getBoolean(const JSValue& value, const char* name, const bool def = false) {
if (value.HasMember(name)) {
auto& v = value[name];
if (v.IsBool()) {
return v.GetBool();
} else {
Log::Warning(Event::Sprite, "Value of '%s' must be a boolean", name);
}
}
return def;
}
} // namespace
SpriteParseResult parseSprite(const std::string& image, const std::string& json) {
Sprites sprites;
PremultipliedImage raster;
try {
raster = decodeImage(image);
} catch (...) {
return std::current_exception();
}
JSDocument doc;
doc.Parse<0>(json.c_str());
if (doc.HasParseError()) {
std::stringstream message;
message << "Failed to parse JSON: " << rapidjson::GetParseError_En(doc.GetParseError()) << " at offset " << doc.GetErrorOffset();
return std::make_exception_ptr(std::runtime_error(message.str()));
} else if (!doc.IsObject()) {
return std::make_exception_ptr(std::runtime_error("Sprite JSON root must be an object"));
} else {
for (const auto& property : doc.GetObject()) {
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", 0);
const uint16_t y = getUInt16(value, "y", 0);
const uint16_t width = getUInt16(value, "width", 0);
const uint16_t height = getUInt16(value, "height", 0);
const double pixelRatio = getDouble(value, "pixelRatio", 1);
const bool sdf = getBoolean(value, "sdf", false);
auto sprite = createSpriteImage(raster, x, y, width, height, pixelRatio, sdf);
if (sprite) {
sprites.emplace(name, sprite);
}
}
}
}
return sprites;
}
} // namespace mbgl
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