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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 srcWidth,
const uint16_t srcHeight,
const double ratio,
const bool sdf) {
// Disallow invalid parameter configurations.
if (srcWidth == 0 || srcHeight == 0 || ratio <= 0 || ratio > 10 || srcWidth > 1024 ||
srcHeight > 1024) {
Log::Warning(Event::Sprite, "Can't create sprite with invalid metrics");
return nullptr;
}
const uint16_t width = std::ceil(double(srcWidth) / ratio);
const uint16_t dstWidth = std::ceil(width * ratio);
assert(dstWidth >= srcWidth);
const uint16_t height = std::ceil(double(srcHeight) / ratio);
const uint16_t dstHeight = std::ceil(height * ratio);
assert(dstHeight >= srcHeight);
std::string data(dstWidth * dstHeight * 4, '\0');
auto srcData = reinterpret_cast<const uint32_t*>(image.data.get());
auto dstData = reinterpret_cast<uint32_t*>(const_cast<char*>(data.data()));
const int32_t maxX = std::min(uint32_t(image.width), uint32_t(srcWidth + srcX)) - srcX;
assert(maxX <= int32_t(image.width));
const int32_t maxY = std::min(uint32_t(image.height), uint32_t(srcHeight + srcY)) - srcY;
assert(maxY <= int32_t(image.height));
// Copy from the source image into our individual sprite image
for (uint16_t y = 0; y < maxY; ++y) {
const auto dstRow = y * dstWidth;
const auto srcRow = (y + srcY) * image.width + srcX;
for (uint16_t x = 0; x < maxX; ++x) {
dstData[dstRow + x] = srcData[srcRow + x];
}
}
return std::make_unique<const SpriteImage>(width, height, ratio, std::move(data), sdf);
}
namespace {
inline 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;
}
inline 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;
}
inline 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::string("Could not parse sprite image");
}
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 message.str();
} else if (!doc.IsObject()) {
return std::string("Sprite JSON root must be an object");
} else {
for (JSValue::ConstMemberIterator itr = doc.MemberBegin(); itr != doc.MemberEnd(); ++itr) {
const std::string name = { itr->name.GetString(), itr->name.GetStringLength() };
const JSValue& value = itr->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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