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#include <llmr/style/style.hpp>
#include <llmr/resources/style.hpp>
using namespace llmr;
Style::Style() {
appliedClasses.insert("default");
}
void Style::reset() {
computed.fills.clear();
computed.strokes.clear();
}
void Style::load(const uint8_t *const data, uint32_t bytes) {
pbf style(data, bytes);
while (style.next()) {
if (style.tag == 1) { // bucket
buckets.insert(parseBucket(style.message()));
} else if (style.tag == 2) { // structure
layers.push_back(parseLayer(style.message()));
} else if (style.tag == 3) { // class
classes.insert(parseClass(style.message()));
} else {
style.skip();
}
}
}
std::pair<std::string, BucketDescription> Style::parseBucket(pbf data) {
BucketDescription bucket;
std::string name;
while (data.next()) {
if (data.tag == 1) { // name
name = data.string();
} else if (data.tag == 2) { // type
bucket.type = (BucketType)data.varint();
} else if (data.tag == 3) { // source_name
bucket.source_name = data.string();
} else if (data.tag == 4) { // source_layer
bucket.source_layer = data.string();
} else if (data.tag == 5) { // source_field
bucket.source_field = data.string();
} else if (data.tag == 6) { // source_value
bucket.source_value.emplace_back(parseValue(data.message()));
} else if (data.tag == 7) { // cap
bucket.cap = (CapType)data.varint();
} else if (data.tag == 8) { // join
bucket.join = (JoinType)data.varint();
} else if (data.tag == 9) { // font
bucket.font = data.string();
} else if (data.tag == 10) { // font_size
bucket.font_size = data.float32();
} else {
data.skip();
}
}
return { name, bucket };
}
LayerDescription Style::parseLayer(pbf data) {
LayerDescription layer;
while (data.next()) {
if (data.tag == 1) { // name
layer.name = data.string();
} else if (data.tag == 2) { // bucket_name
layer.bucket_name = data.string();
} else if (data.tag == 3) { // child_layer
layer.child_layer.emplace_back(parseLayer(data.message()));
} else {
data.skip();
}
}
return layer;
}
std::pair<std::string, ClassDescription> Style::parseClass(pbf data) {
ClassDescription klass;
std::string name;
while (data.next()) {
if (data.tag == 1) { // name
name = data.string();
} else if (data.tag == 2) { // fill_style
klass.fill.insert(parseFillClass(data.message()));
} else if (data.tag == 3) { // stroke_style
klass.stroke.insert(parseStrokeClass(data.message()));
} else {
data.skip();
}
}
return { name, klass };
}
std::pair<std::string, FillClass> Style::parseFillClass(pbf data) {
FillClass fill;
std::string name;
while (data.next()) {
if (data.tag == 1) { // name
name = data.string();
} else if (data.tag == 2) { // hidden
fill.hidden = parseProperty<bool>(data.message());
} else if (data.tag == 3) { // winding
fill.winding = (Winding)data.varint();
} else if (data.tag == 4) { // antialias
fill.antialias = parseProperty<bool>(data.message());
} else if (data.tag == 5) { // fill_color
fill.fill_color = parseColor(data);
if (fill.stroke_color[3] == std::numeric_limits<float>::infinity()) {
fill.stroke_color = fill.fill_color;
}
} else if (data.tag == 6) { // stroke_color
fill.stroke_color = parseColor(data);
} else if (data.tag == 7) { // opacity
fill.opacity = parseProperty<float>(data.message());
} else {
data.skip();
}
}
return { name, fill };
}
std::pair<std::string, StrokeClass> Style::parseStrokeClass(pbf data) {
StrokeClass stroke;
std::string name;
while (data.next()) {
if (data.tag == 1) { // name
name = data.string();
} else if (data.tag == 2) { // hidden
stroke.hidden = parseProperty<bool>(data.message());
} else if (data.tag == 3) { // color
stroke.color = parseColor(data);
} else if (data.tag == 4) { // width
stroke.width = parseProperty<float>(data.message());
} else if (data.tag == 5) { // opacity
stroke.offset = parseProperty<float>(data.message());
} else {
data.skip();
}
}
return { name, stroke };
}
Color Style::parseColor(pbf& data) {
uint32_t rgba = data.fixed<uint32_t, 4>();
return {{
(float)((rgba >> 24) & 0xFF) / 0xFF,
(float)((rgba >> 16) & 0xFF) / 0xFF,
(float)((rgba >> 8) & 0xFF) / 0xFF,
(float)((rgba >> 0) & 0xFF) / 0xFF
}};
}
template <typename T> FunctionProperty<T> Style::parseProperty(pbf data) {
FunctionProperty<T> property;
while (data.next()) {
if (data.tag == 1) { // function
switch((Property)data.varint()) {
case Property::Null: property.function = &functions::null; break;
case Property::Constant: property.function = &functions::constant; break;
default: property.function = &functions::null; break;
}
} else if (data.tag == 2) { // value
// read a packed float32
pbf floats = data.message();
while (floats) {
property.values.push_back(floats.float32());
}
} else {
data.skip();
}
}
return property;
}
void Style::cascade(float z) {
reset();
// Recalculate style
// Basic cascading
for (const auto& class_pair : classes) {
const std::string& class_name = class_pair.first;
const ClassDescription& sheetClass = class_pair.second;
// Not enabled
if (appliedClasses.find(class_name) == appliedClasses.end()) continue;
// Cascade fill classes
for (const auto& fill_pair : sheetClass.fill) {
const std::string& layer_name = fill_pair.first;
const llmr::FillClass& layer = fill_pair.second;
llmr::FillProperties& fill = computed.fills[layer_name];
fill.hidden = layer.hidden(z);
fill.winding = layer.winding;
fill.antialias = layer.antialias(z);
fill.fill_color = layer.fill_color;
fill.stroke_color = layer.stroke_color;
fill.opacity = layer.opacity(z);
}
// Cascade line classes
for (const auto& stroke_pair : sheetClass.stroke) {
const std::string& layer_name = stroke_pair.first;
const llmr::StrokeClass& layer = stroke_pair.second;
llmr::StrokeProperties& stroke = computed.strokes[layer_name];
stroke.hidden = layer.hidden(z);
stroke.width = layer.width(z);
stroke.offset = layer.offset(z);
stroke.color = layer.color;
}
}
}
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