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symbol_layout.cpp
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symbol_layout.cpp
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#include <mbgl/layout/symbol_layout.hpp>
#include <mbgl/layout/merge_lines.hpp>
#include <mbgl/layout/clip_lines.hpp>
#include <mbgl/renderer/bucket_parameters.hpp>
#include <mbgl/renderer/layers/render_symbol_layer.hpp>
#include <mbgl/renderer/image_atlas.hpp>
#include <mbgl/text/get_anchors.hpp>
#include <mbgl/text/shaping.hpp>
#include <mbgl/util/utf.hpp>
#include <mbgl/util/constants.hpp>
#include <mbgl/util/string.hpp>
#include <mbgl/util/i18n.hpp>
#include <mbgl/util/platform.hpp>
#include <mbgl/tile/geometry_tile_data.hpp>
#include <mbgl/tile/tile.hpp>
#include <mapbox/polylabel.hpp>
namespace mbgl {
using namespace style;
template <class Property>
static bool has(const style::SymbolLayoutProperties::PossiblyEvaluated& layout) {
return layout.get<Property>().match(
[] (const typename Property::Type& t) { return !t.empty(); },
[] (const auto&) { return true; }
);
}
namespace {
expression::Value sectionOptionsToValue(const SectionOptions& options) {
std::unordered_map<std::string, expression::Value> result;
// TODO: Data driven properties that can be overridden on per section basis.
// TextOpacity
// TextHaloColor
// TextHaloWidth
// TextHaloBlur
if (options.textColor) {
result.emplace(expression::kFormattedSectionTextColor, *options.textColor);
}
return result;
}
inline const SymbolLayerProperties& toSymbolLayerProperties(const Immutable<LayerProperties>& layer) {
return static_cast<const SymbolLayerProperties&>(*layer);
}
inline Immutable<style::SymbolLayoutProperties::PossiblyEvaluated> createLayout(const SymbolLayoutProperties::Unevaluated& unevaluated, float zoom) {
auto layout = makeMutable<style::SymbolLayoutProperties::PossiblyEvaluated>(unevaluated.evaluate(PropertyEvaluationParameters(zoom)));
if (layout->get<IconRotationAlignment>() == AlignmentType::Auto) {
if (layout->get<SymbolPlacement>() != SymbolPlacementType::Point) {
layout->get<IconRotationAlignment>() = AlignmentType::Map;
} else {
layout->get<IconRotationAlignment>() = AlignmentType::Viewport;
}
}
if (layout->get<TextRotationAlignment>() == AlignmentType::Auto) {
if (layout->get<SymbolPlacement>() != SymbolPlacementType::Point) {
layout->get<TextRotationAlignment>() = AlignmentType::Map;
} else {
layout->get<TextRotationAlignment>() = AlignmentType::Viewport;
}
}
// If unspecified `*-pitch-alignment` inherits `*-rotation-alignment`
if (layout->get<TextPitchAlignment>() == AlignmentType::Auto) {
layout->get<TextPitchAlignment>() = layout->get<TextRotationAlignment>();
}
if (layout->get<IconPitchAlignment>() == AlignmentType::Auto) {
layout->get<IconPitchAlignment>() = layout->get<IconRotationAlignment>();
}
return std::move(layout);
}
} // namespace
SymbolLayout::SymbolLayout(const BucketParameters& parameters,
const std::vector<Immutable<style::LayerProperties>>& layers,
std::unique_ptr<GeometryTileLayer> sourceLayer_,
const LayoutParameters& layoutParameters)
: bucketLeaderID(layers.front()->baseImpl->id),
sourceLayer(std::move(sourceLayer_)),
overscaling(parameters.tileID.overscaleFactor()),
zoom(parameters.tileID.overscaledZ),
canonicalID(parameters.tileID.canonical),
mode(parameters.mode),
pixelRatio(parameters.pixelRatio),
tileSize(util::tileSize * overscaling),
tilePixelRatio(float(util::EXTENT) / tileSize),
layout(createLayout(toSymbolLayerProperties(layers.at(0)).layerImpl().layout, zoom)) {
const SymbolLayer::Impl& leader = toSymbolLayerProperties(layers.at(0)).layerImpl();
textSize = leader.layout.get<TextSize>();
iconSize = leader.layout.get<IconSize>();
textRadialOffset = leader.layout.get<TextRadialOffset>();
const bool hasText = has<TextField>(*layout) && has<TextFont>(*layout);
const bool hasIcon = has<IconImage>(*layout);
if (!hasText && !hasIcon) {
return;
}
const bool hasSymbolSortKey = !leader.layout.get<SymbolSortKey>().isUndefined();
const auto symbolZOrder = layout->get<SymbolZOrder>();
sortFeaturesByKey = symbolZOrder != SymbolZOrderType::ViewportY && hasSymbolSortKey;
const bool zOrderByViewportY = symbolZOrder == SymbolZOrderType::ViewportY || (symbolZOrder == SymbolZOrderType::Auto && !sortFeaturesByKey);
sortFeaturesByY = zOrderByViewportY && (layout->get<TextAllowOverlap>() || layout->get<IconAllowOverlap>() ||
layout->get<TextIgnorePlacement>() || layout->get<IconIgnorePlacement>());
if (layout->get<SymbolPlacement>() == SymbolPlacementType::Point) {
auto modes = layout->get<TextWritingMode>();
// Remove duplicates and preserve order.
std::set<style::TextWritingModeType> seen;
auto end = std::remove_if(modes.begin(),
modes.end(),
[&seen, this](const auto& placementMode) {
allowVerticalPlacement = allowVerticalPlacement || placementMode == style::TextWritingModeType::Vertical;
return !seen.insert(placementMode).second;
});
modes.erase(end, modes.end());
placementModes = std::move(modes);
}
for (const auto& layer : layers) {
layerPaintProperties.emplace(layer->baseImpl->id, layer);
}
// Determine glyph dependencies
const size_t featureCount = sourceLayer->featureCount();
for (size_t i = 0; i < featureCount; ++i) {
auto feature = sourceLayer->getFeature(i);
if (!leader.filter(expression::EvaluationContext(this->zoom, feature.get())
.withCanonicalTileID(¶meters.tileID.canonical)))
continue;
SymbolFeature ft(std::move(feature));
ft.index = i;
if (hasText) {
auto formatted = layout->evaluate<TextField>(zoom, ft, layoutParameters.availableImages, canonicalID);
auto textTransform = layout->evaluate<TextTransform>(zoom, ft, canonicalID);
FontStack baseFontStack = layout->evaluate<TextFont>(zoom, ft, canonicalID);
ft.formattedText = TaggedString();
for (const auto & section : formatted.sections) {
if (!section.image) {
std::string u8string = section.text;
if (textTransform == TextTransformType::Uppercase) {
u8string = platform::uppercase(u8string);
} else if (textTransform == TextTransformType::Lowercase) {
u8string = platform::lowercase(u8string);
}
ft.formattedText->addTextSection(applyArabicShaping(util::convertUTF8ToUTF16(u8string)),
section.fontScale ? *section.fontScale : 1.0,
section.fontStack ? *section.fontStack : baseFontStack,
section.textColor);
} else {
layoutParameters.imageDependencies.emplace(section.image->id(), ImageType::Icon);
ft.formattedText->addImageSection(section.image->id());
}
}
const bool canVerticalizeText = layout->get<TextRotationAlignment>() == AlignmentType::Map
&& layout->get<SymbolPlacement>() != SymbolPlacementType::Point
&& ft.formattedText->allowsVerticalWritingMode();
// Loop through all characters of this text and collect unique codepoints.
for (std::size_t j = 0; j < ft.formattedText->length(); j++) {
const auto& section = formatted.sections[ft.formattedText->getSectionIndex(j)];
if (section.image) continue;
const auto& sectionFontStack = section.fontStack;
GlyphIDs& dependencies =
layoutParameters.glyphDependencies[sectionFontStack ? *sectionFontStack : baseFontStack];
char16_t codePoint = ft.formattedText->getCharCodeAt(j);
dependencies.insert(codePoint);
if (canVerticalizeText || (allowVerticalPlacement && ft.formattedText->allowsVerticalWritingMode())) {
if (char16_t verticalChr = util::i18n::verticalizePunctuation(codePoint)) {
dependencies.insert(verticalChr);
}
}
}
}
if (hasIcon) {
ft.icon = layout->evaluate<IconImage>(zoom, ft, layoutParameters.availableImages, canonicalID);
layoutParameters.imageDependencies.emplace(ft.icon->id(), ImageType::Icon);
}
if (ft.formattedText || ft.icon) {
if (sortFeaturesByKey) {
ft.sortKey = layout->evaluate<SymbolSortKey>(zoom, ft, canonicalID);
const auto lowerBound = std::lower_bound(features.begin(), features.end(), ft);
features.insert(lowerBound, std::move(ft));
} else {
features.push_back(std::move(ft));
}
}
}
if (layout->get<SymbolPlacement>() == SymbolPlacementType::Line) {
util::mergeLines(features);
}
}
bool SymbolLayout::hasDependencies() const {
return !features.empty();
}
bool SymbolLayout::hasSymbolInstances() const {
return !symbolInstances.empty();
}
namespace {
// The radial offset is to the edge of the text box
// In the horizontal direction, the edge of the text box is where glyphs start
// But in the vertical direction, the glyphs appear to "start" at the baseline
// We don't actually load baseline data, but we assume an offset of ONE_EM - 17
// (see "yOffset" in shaping.js)
const float baselineOffset = 7.0f;
// We don't care which shaping we get because this is used for collision purposes
// and all the justifications have the same collision box.
const Shaping& getDefaultHorizontalShaping(const ShapedTextOrientations& shapedTextOrientations) {
if (shapedTextOrientations.right) return shapedTextOrientations.right;
if (shapedTextOrientations.center) return shapedTextOrientations.center;
if (shapedTextOrientations.left) return shapedTextOrientations.left;
return shapedTextOrientations.horizontal;
}
Shaping& shapingForTextJustifyType(ShapedTextOrientations& shapedTextOrientations, style::TextJustifyType type) {
switch(type) {
case style::TextJustifyType::Right: return shapedTextOrientations.right;
case style::TextJustifyType::Left: return shapedTextOrientations.left;
case style::TextJustifyType::Center: return shapedTextOrientations.center;
default:
assert(false);
return shapedTextOrientations.horizontal;
}
}
std::array<float, 2> evaluateRadialOffset(style::SymbolAnchorType anchor, float radialOffset) {
std::array<float, 2> result{{0.0f, 0.0f}};
if (radialOffset < 0.0f) radialOffset = 0.0f; // Ignore negative offset.
// solve for r where r^2 + r^2 = radialOffset^2
const float sqrt2 = 1.41421356237f;
const float hypotenuse = radialOffset / sqrt2;
switch (anchor) {
case SymbolAnchorType::TopRight:
case SymbolAnchorType::TopLeft:
result[1] = hypotenuse - baselineOffset;
break;
case SymbolAnchorType::BottomRight:
case SymbolAnchorType::BottomLeft:
result[1] = -hypotenuse + baselineOffset;
break;
case SymbolAnchorType::Bottom:
result[1] = -radialOffset + baselineOffset;
break;
case SymbolAnchorType::Top:
result[1] = radialOffset - baselineOffset;
break;
default:
break;
}
switch (anchor) {
case SymbolAnchorType::TopRight:
case SymbolAnchorType::BottomRight:
result[0] = -hypotenuse;
break;
case SymbolAnchorType::TopLeft:
case SymbolAnchorType::BottomLeft:
result[0] = hypotenuse;
break;
case SymbolAnchorType::Left:
result[0] = radialOffset;
break;
case SymbolAnchorType::Right:
result[0] = -radialOffset;
break;
default:
break;
}
return result;
}
} // namespace
// static
std::array<float, 2> SymbolLayout::evaluateVariableOffset(style::SymbolAnchorType anchor, std::array<float, 2> offset) {
if (offset[1] == INVALID_OFFSET_VALUE) {
return evaluateRadialOffset(anchor, offset[0]);
}
std::array<float, 2> result{{0.0f, 0.0f}};
offset[0] = std::abs(offset[0]);
offset[1] = std::abs(offset[1]);
switch (anchor) {
case SymbolAnchorType::TopRight:
case SymbolAnchorType::TopLeft:
case SymbolAnchorType::Top:
result[1] = offset[1] - baselineOffset;
break;
case SymbolAnchorType::BottomRight:
case SymbolAnchorType::BottomLeft:
case SymbolAnchorType::Bottom:
result[1] = -offset[1] + baselineOffset;
break;
case SymbolAnchorType::Center:
case SymbolAnchorType::Left:
case SymbolAnchorType::Right:
break;
}
switch (anchor) {
case SymbolAnchorType::TopRight:
case SymbolAnchorType::BottomRight:
case SymbolAnchorType::Right:
result[0] = -offset[0];
break;
case SymbolAnchorType::TopLeft:
case SymbolAnchorType::BottomLeft:
case SymbolAnchorType::Left:
result[0] = offset[0];
break;
case SymbolAnchorType::Center:
case SymbolAnchorType::Top:
case SymbolAnchorType::Bottom:
break;
}
return result;
}
void SymbolLayout::prepareSymbols(const GlyphMap& glyphMap,
const GlyphPositions& glyphPositions,
const ImageMap& imageMap,
const ImagePositions& imagePositions) {
const bool isPointPlacement = layout->get<SymbolPlacement>() == SymbolPlacementType::Point;
const bool textAlongLine = layout->get<TextRotationAlignment>() == AlignmentType::Map && !isPointPlacement;
for (auto it = features.begin(); it != features.end(); ++it) {
auto& feature = *it;
if (feature.geometry.empty()) continue;
ShapedTextOrientations shapedTextOrientations;
optional<PositionedIcon> shapedIcon;
std::array<float, 2> textOffset{{0.0f, 0.0f}};
const float layoutTextSize = layout->evaluate<TextSize>(zoom + 1, feature, canonicalID);
const float layoutTextSizeAtBucketZoomLevel = layout->evaluate<TextSize>(zoom, feature, canonicalID);
const float layoutIconSize = layout->evaluate<IconSize>(zoom + 1, feature, canonicalID);
// if feature has text, shape the text
if (feature.formattedText && layoutTextSize > 0.0f) {
const float lineHeight = layout->get<TextLineHeight>() * util::ONE_EM;
const float spacing = util::i18n::allowsLetterSpacing(feature.formattedText->rawText())
? layout->evaluate<TextLetterSpacing>(zoom, feature, canonicalID) * util::ONE_EM
: 0.0f;
auto applyShaping = [&](const TaggedString& formattedText,
WritingModeType writingMode,
SymbolAnchorType textAnchor,
TextJustifyType textJustify) {
const Shaping result = getShaping(
/* string */ formattedText,
/* maxWidth: ems */
isPointPlacement ? layout->evaluate<TextMaxWidth>(zoom, feature, canonicalID) * util::ONE_EM : 0.0f,
/* ems */ lineHeight,
textAnchor,
textJustify,
/* ems */ spacing,
/* translate */ textOffset,
/* writingMode */ writingMode,
/* bidirectional algorithm object */ bidi,
glyphMap,
/* glyphs */ glyphPositions,
/* images */ imagePositions,
layoutTextSize,
layoutTextSizeAtBucketZoomLevel,
allowVerticalPlacement);
return result;
};
const std::vector<style::TextVariableAnchorType> variableTextAnchor =
layout->evaluate<TextVariableAnchor>(zoom, feature, canonicalID);
const SymbolAnchorType textAnchor = layout->evaluate<TextAnchor>(zoom, feature, canonicalID);
if (variableTextAnchor.empty()) {
// Layers with variable anchors use the `text-radial-offset` property and the [x, y] offset vector
// is calculated at placement time instead of layout time
const float radialOffset = layout->evaluate<TextRadialOffset>(zoom, feature, canonicalID);
if (radialOffset > 0.0f) {
// The style spec says don't use `text-offset` and `text-radial-offset` together
// but doesn't actually specify what happens if you use both. We go with the radial offset.
textOffset = evaluateRadialOffset(textAnchor, radialOffset * util::ONE_EM);
} else {
textOffset = {{layout->evaluate<TextOffset>(zoom, feature, canonicalID)[0] * util::ONE_EM,
layout->evaluate<TextOffset>(zoom, feature, canonicalID)[1] * util::ONE_EM}};
}
}
TextJustifyType textJustify =
textAlongLine ? TextJustifyType::Center : layout->evaluate<TextJustify>(zoom, feature, canonicalID);
const auto addVerticalShapingForPointLabelIfNeeded = [&] {
if (allowVerticalPlacement && feature.formattedText->allowsVerticalWritingMode()) {
feature.formattedText->verticalizePunctuation();
// Vertical POI label placement is meant to be used for scripts that support vertical
// writing mode, thus, default style::TextJustifyType::Left justification is used. If Latin
// scripts would need to be supported, this should take into account other justifications.
shapedTextOrientations.vertical = applyShaping(*feature.formattedText, WritingModeType::Vertical, textAnchor, style::TextJustifyType::Left);
}
};
// If this layer uses text-variable-anchor, generate shapings for all justification possibilities.
if (!textAlongLine && !variableTextAnchor.empty()) {
std::vector<TextJustifyType> justifications;
if (textJustify != TextJustifyType::Auto) {
justifications.push_back(textJustify);
} else {
for (auto anchor : variableTextAnchor) {
justifications.push_back(getAnchorJustification(anchor));
}
}
for (TextJustifyType justification: justifications) {
Shaping& shapingForJustification = shapingForTextJustifyType(shapedTextOrientations, justification);
if (shapingForJustification) {
continue;
}
// If using text-variable-anchor for the layer, we use a center anchor for all shapings and apply
// the offsets for the anchor in the placement step.
Shaping shaping = applyShaping(*feature.formattedText, WritingModeType::Horizontal, SymbolAnchorType::Center, justification);
if (shaping) {
shapingForJustification = std::move(shaping);
if (shapingForJustification.positionedLines.size() == 1u) {
shapedTextOrientations.singleLine = true;
break;
}
}
}
// Vertical point label shaping if allowVerticalPlacement is enabled.
addVerticalShapingForPointLabelIfNeeded();
} else {
if (textJustify == TextJustifyType::Auto) {
textJustify = getAnchorJustification(textAnchor);
}
// Horizontal point or line label.
Shaping shaping = applyShaping(*feature.formattedText, WritingModeType::Horizontal, textAnchor, textJustify);
if (shaping) {
shapedTextOrientations.horizontal = std::move(shaping);
}
// Vertical point label shaping if allowVerticalPlacement is enabled.
addVerticalShapingForPointLabelIfNeeded();
// Verticalized line label.
if (textAlongLine && feature.formattedText->allowsVerticalWritingMode()) {
feature.formattedText->verticalizePunctuation();
shapedTextOrientations.vertical = applyShaping(*feature.formattedText, WritingModeType::Vertical, textAnchor, textJustify);
}
}
}
// if feature has icon, get sprite atlas position
SymbolContent iconType{SymbolContent::None};
if (feature.icon) {
auto image = imageMap.find(feature.icon->id());
if (image != imageMap.end()) {
iconType = SymbolContent::IconRGBA;
shapedIcon = PositionedIcon::shapeIcon(imagePositions.at(feature.icon->id()),
layout->evaluate<IconOffset>(zoom, feature, canonicalID),
layout->evaluate<IconAnchor>(zoom, feature, canonicalID));
if (image->second->sdf) {
iconType = SymbolContent::IconSDF;
}
if (image->second->pixelRatio != pixelRatio) {
iconsNeedLinear = true;
} else if (layout->get<IconRotate>().constantOr(1) != 0) {
iconsNeedLinear = true;
}
}
}
// if either shapedText or icon position is present, add the feature
const Shaping& defaultShaping = getDefaultHorizontalShaping(shapedTextOrientations);
iconsInText = defaultShaping ? defaultShaping.iconsInText : false;
if (defaultShaping || shapedIcon) {
addFeature(std::distance(features.begin(), it),
feature,
shapedTextOrientations,
std::move(shapedIcon),
imageMap,
textOffset,
layoutTextSize,
layoutIconSize,
iconType);
}
feature.geometry.clear();
}
compareText.clear();
}
void SymbolLayout::addFeature(const std::size_t layoutFeatureIndex,
const SymbolFeature& feature,
const ShapedTextOrientations& shapedTextOrientations,
optional<PositionedIcon> shapedIcon,
const ImageMap& imageMap,
std::array<float, 2> textOffset,
float layoutTextSize,
float layoutIconSize,
const SymbolContent iconType) {
const float minScale = 0.5f;
const float glyphSize = 24.0f;
const std::array<float, 2> iconOffset = layout->evaluate<IconOffset>(zoom, feature, canonicalID);
// To reduce the number of labels that jump around when zooming we need
// to use a text-size value that is the same for all zoom levels.
// This calculates text-size at a high zoom level so that all tiles can
// use the same value when calculating anchor positions.
const float textMaxSize = layout->evaluate<TextSize>(18, feature, canonicalID);
const float fontScale = layoutTextSize / glyphSize;
const float textBoxScale = tilePixelRatio * fontScale;
const float textMaxBoxScale = tilePixelRatio * textMaxSize / glyphSize;
const float iconBoxScale = tilePixelRatio * layoutIconSize;
const float symbolSpacing = tilePixelRatio * layout->get<SymbolSpacing>();
const float textPadding = layout->get<TextPadding>() * tilePixelRatio;
const float iconPadding = layout->get<IconPadding>() * tilePixelRatio;
const float textMaxAngle = layout->get<TextMaxAngle>() * util::DEG2RAD;
const float iconRotation = layout->evaluate<IconRotate>(zoom, feature, canonicalID);
const float textRotation = layout->evaluate<TextRotate>(zoom, feature, canonicalID);
std::array<float, 2> variableTextOffset;
if (!textRadialOffset.isUndefined()) {
variableTextOffset = {
{layout->evaluate<TextRadialOffset>(zoom, feature, canonicalID) * util::ONE_EM, INVALID_OFFSET_VALUE}};
} else {
variableTextOffset = {{layout->evaluate<TextOffset>(zoom, feature, canonicalID)[0] * util::ONE_EM,
layout->evaluate<TextOffset>(zoom, feature, canonicalID)[1] * util::ONE_EM}};
}
const SymbolPlacementType textPlacement = layout->get<TextRotationAlignment>() != AlignmentType::Map
? SymbolPlacementType::Point
: layout->get<SymbolPlacement>();
const float textRepeatDistance = symbolSpacing / 2;
const auto evaluatedLayoutProperties = layout->evaluate(zoom, feature);
IndexedSubfeature indexedFeature(feature.index, sourceLayer->getName(), bucketLeaderID, symbolInstances.size());
const auto iconTextFit = evaluatedLayoutProperties.get<style::IconTextFit>();
const bool hasIconTextFit = iconTextFit != IconTextFitType::None;
// Adjust shaped icon size when icon-text-fit is used.
optional<PositionedIcon> verticallyShapedIcon;
if (shapedIcon && hasIconTextFit) {
// Create vertically shaped icon for vertical writing mode if needed.
if (allowVerticalPlacement && shapedTextOrientations.vertical) {
verticallyShapedIcon = shapedIcon;
verticallyShapedIcon->fitIconToText(
shapedTextOrientations.vertical, iconTextFit, layout->get<IconTextFitPadding>(), iconOffset, fontScale);
}
const auto& shapedText = getDefaultHorizontalShaping(shapedTextOrientations);
if (shapedText) {
shapedIcon->fitIconToText(
shapedText, iconTextFit, layout->get<IconTextFitPadding>(), iconOffset, fontScale);
}
}
auto addSymbolInstance = [&](Anchor& anchor, std::shared_ptr<SymbolInstanceSharedData> sharedData) {
assert(sharedData);
const bool anchorInsideTile = anchor.point.x >= 0 && anchor.point.x < util::EXTENT && anchor.point.y >= 0 &&
anchor.point.y < util::EXTENT;
if (mode == MapMode::Tile || anchorInsideTile) {
// For static/continuous rendering, only add symbols anchored within this tile:
// neighboring symbols will be added as part of the neighboring tiles.
// In tiled rendering mode, add all symbols in the buffers so that we can:
// (1) render symbols that overlap into this tile
// (2) approximate collision detection effects from neighboring symbols
symbolInstances.emplace_back(anchor,
std::move(sharedData),
shapedTextOrientations,
shapedIcon,
verticallyShapedIcon,
textBoxScale,
textPadding,
textPlacement,
textOffset,
iconBoxScale,
iconPadding,
iconOffset,
indexedFeature,
layoutFeatureIndex,
feature.index,
feature.formattedText ? feature.formattedText->rawText() : std::u16string(),
overscaling,
iconRotation,
textRotation,
variableTextOffset,
allowVerticalPlacement,
iconType);
if (sortFeaturesByKey) {
if (!sortKeyRanges.empty() && sortKeyRanges.back().sortKey == feature.sortKey) {
sortKeyRanges.back().end = symbolInstances.size();
} else {
sortKeyRanges.push_back({feature.sortKey, symbolInstances.size() - 1, symbolInstances.size()});
}
}
}
};
const auto createSymbolInstanceSharedData = [&](GeometryCoordinates line) {
return std::make_shared<SymbolInstanceSharedData>(std::move(line),
shapedTextOrientations,
shapedIcon,
verticallyShapedIcon,
evaluatedLayoutProperties,
textPlacement,
textOffset,
imageMap,
iconRotation,
iconType,
hasIconTextFit,
allowVerticalPlacement);
};
const auto& type = feature.getType();
if (layout->get<SymbolPlacement>() == SymbolPlacementType::Line) {
auto clippedLines = util::clipLines(feature.geometry, 0, 0, util::EXTENT, util::EXTENT);
for (auto& line : clippedLines) {
Anchors anchors = getAnchors(line,
symbolSpacing,
textMaxAngle,
(shapedTextOrientations.vertical ?: getDefaultHorizontalShaping(shapedTextOrientations)).left,
(shapedTextOrientations.vertical ?: getDefaultHorizontalShaping(shapedTextOrientations)).right,
(shapedIcon ? shapedIcon->left() : 0),
(shapedIcon ? shapedIcon->right() : 0),
glyphSize,
textMaxBoxScale,
overscaling);
auto sharedData = createSymbolInstanceSharedData(std::move(line));
for (auto& anchor : anchors) {
if (!feature.formattedText || !anchorIsTooClose(feature.formattedText->rawText(), textRepeatDistance, anchor)) {
addSymbolInstance(anchor, sharedData);
}
}
}
} else if (layout->get<SymbolPlacement>() == SymbolPlacementType::LineCenter) {
// No clipping, multiple lines per feature are allowed
// "lines" with only one point are ignored as in clipLines
for (const auto& line : feature.geometry) {
if (line.size() > 1) {
optional<Anchor> anchor = getCenterAnchor(line,
textMaxAngle,
(shapedTextOrientations.vertical ?: getDefaultHorizontalShaping(shapedTextOrientations)).left,
(shapedTextOrientations.vertical ?: getDefaultHorizontalShaping(shapedTextOrientations)).right,
(shapedIcon ? shapedIcon->left() : 0),
(shapedIcon ? shapedIcon->right() : 0),
glyphSize,
textMaxBoxScale);
if (anchor) {
addSymbolInstance(*anchor, createSymbolInstanceSharedData(line));
}
}
}
} else if (type == FeatureType::Polygon) {
for (const auto& polygon : classifyRings(feature.geometry)) {
Polygon<double> poly;
for (const auto& ring : polygon) {
LinearRing<double> r;
for (const auto& p : ring) {
r.push_back(convertPoint<double>(p));
}
poly.push_back(r);
}
// 1 pixel worth of precision, in tile coordinates
auto poi = mapbox::polylabel(poly, double(util::EXTENT / util::tileSize));
Anchor anchor(poi.x, poi.y, 0, minScale);
addSymbolInstance(anchor, createSymbolInstanceSharedData(polygon[0]));
}
} else if (type == FeatureType::LineString) {
for (const auto& line : feature.geometry) {
Anchor anchor(line[0].x, line[0].y, 0, minScale);
addSymbolInstance(anchor, createSymbolInstanceSharedData(line));
}
} else if (type == FeatureType::Point) {
for (const auto& points : feature.geometry) {
for (const auto& point : points) {
Anchor anchor(point.x, point.y, 0, minScale);
addSymbolInstance(anchor, createSymbolInstanceSharedData({point}));
}
}
}
}
bool SymbolLayout::anchorIsTooClose(const std::u16string& text, const float repeatDistance, const Anchor& anchor) {
if (compareText.find(text) == compareText.end()) {
compareText.emplace(text, Anchors());
} else {
const auto& otherAnchors = compareText.find(text)->second;
for (const Anchor& otherAnchor : otherAnchors) {
if (util::dist<float>(anchor.point, otherAnchor.point) < repeatDistance) {
return true;
}
}
}
compareText[text].push_back(anchor);
return false;
}
// Analog of `addToLineVertexArray` in JS. This version doesn't need to build up a line array like the
// JS version does, but it uses the same logic to calculate tile distances.
std::vector<float> SymbolLayout::calculateTileDistances(const GeometryCoordinates& line, const Anchor& anchor) {
std::vector<float> tileDistances(line.size());
if (anchor.segment) {
std::size_t segment = *anchor.segment;
assert(segment < line.size());
auto sumForwardLength = (segment + 1 < line.size()) ? util::dist<float>(anchor.point, line[segment + 1]) : .0f;
auto sumBackwardLength = util::dist<float>(anchor.point, line[segment]);
for (std::size_t i = segment + 1; i < line.size(); ++i) {
tileDistances[i] = sumForwardLength;
if (i < line.size() - 1) {
sumForwardLength += util::dist<float>(line[i + 1], line[i]);
}
}
for (std::size_t i = segment;; --i) {
tileDistances[i] = sumBackwardLength;
if (i != 0u) {
sumBackwardLength += util::dist<float>(line[i - 1], line[i]);
} else {
break; // Add break to avoid unsigned integer overflow when i==0
}
}
}
return tileDistances;
}
void SymbolLayout::createBucket(const ImagePositions&,
std::unique_ptr<FeatureIndex>&,
std::unordered_map<std::string, LayerRenderData>& renderData,
const bool firstLoad,
const bool showCollisionBoxes,
const CanonicalTileID& canonical) {
auto bucket = std::make_shared<SymbolBucket>(layout,
layerPaintProperties,
textSize,
iconSize,
zoom,
iconsNeedLinear,
sortFeaturesByY,
bucketLeaderID,
std::move(symbolInstances),
std::move(sortKeyRanges),
tilePixelRatio,
allowVerticalPlacement,
std::move(placementModes),
iconsInText);
for (SymbolInstance &symbolInstance : bucket->symbolInstances) {
const bool hasText = symbolInstance.hasText();
const bool hasIcon = symbolInstance.hasIcon();
const bool singleLine = symbolInstance.singleLine;
const auto& feature = features.at(symbolInstance.layoutFeatureIndex);
// Insert final placement into collision tree and add glyphs/icons to buffers
// Process icon first, so that text symbols would have reference to iconIndex which
// is used when dynamic vertices for icon-text-fit image have to be updated.
if (hasIcon) {
const Range<float> sizeData = bucket->iconSizeBinder->getVertexSizeData(feature);
auto& iconBuffer = symbolInstance.hasSdfIcon() ? bucket->sdfIcon : bucket->icon;
const auto placeIcon = [&](const SymbolQuads& iconQuads, auto& index, const WritingModeType writingMode) {
iconBuffer.placedSymbols.emplace_back(symbolInstance.anchor.point,
symbolInstance.anchor.segment.value_or(0u),
sizeData.min,
sizeData.max,
symbolInstance.iconOffset,
writingMode,
symbolInstance.line(),
std::vector<float>());
index = iconBuffer.placedSymbols.size() - 1;
PlacedSymbol& iconSymbol = iconBuffer.placedSymbols.back();
iconSymbol.angle = (allowVerticalPlacement && writingMode == WritingModeType::Vertical) ? M_PI_2 : 0;
iconSymbol.vertexStartIndex =
addSymbols(iconBuffer, sizeData, iconQuads, symbolInstance.anchor, iconSymbol, feature.sortKey);
};
placeIcon(*symbolInstance.iconQuads(), symbolInstance.placedIconIndex, WritingModeType::None);
if (symbolInstance.verticalIconQuads()) {
placeIcon(*symbolInstance.verticalIconQuads(),
symbolInstance.placedVerticalIconIndex,
WritingModeType::Vertical);
}
for (auto& pair : bucket->paintProperties) {
pair.second.iconBinders.populateVertexVectors(
feature, iconBuffer.vertices.elements(), symbolInstance.dataFeatureIndex, {}, {}, canonical);
}
}
if (hasText && feature.formattedText) {
optional<std::size_t> lastAddedSection;
if (singleLine) {
optional<std::size_t> placedTextIndex;
lastAddedSection = addSymbolGlyphQuads(*bucket,
symbolInstance,
feature,
symbolInstance.writingModes,
placedTextIndex,
symbolInstance.rightJustifiedGlyphQuads(),
canonical,
lastAddedSection);
symbolInstance.placedRightTextIndex = placedTextIndex;
symbolInstance.placedCenterTextIndex = placedTextIndex;
symbolInstance.placedLeftTextIndex = placedTextIndex;
} else {
if (symbolInstance.rightJustifiedGlyphQuadsSize) {
lastAddedSection = addSymbolGlyphQuads(*bucket,
symbolInstance,
feature,
symbolInstance.writingModes,
symbolInstance.placedRightTextIndex,
symbolInstance.rightJustifiedGlyphQuads(),
canonical,
lastAddedSection);
}
if (symbolInstance.centerJustifiedGlyphQuadsSize) {
lastAddedSection = addSymbolGlyphQuads(*bucket,
symbolInstance,
feature,
symbolInstance.writingModes,
symbolInstance.placedCenterTextIndex,
symbolInstance.centerJustifiedGlyphQuads(),
canonical,
lastAddedSection);
}
if (symbolInstance.leftJustifiedGlyphQuadsSize) {
lastAddedSection = addSymbolGlyphQuads(*bucket,
symbolInstance,
feature,
symbolInstance.writingModes,
symbolInstance.placedLeftTextIndex,
symbolInstance.leftJustifiedGlyphQuads(),
canonical,
lastAddedSection);
}
}
if (symbolInstance.writingModes & WritingModeType::Vertical && symbolInstance.verticalGlyphQuadsSize) {
lastAddedSection = addSymbolGlyphQuads(*bucket,
symbolInstance,
feature,
WritingModeType::Vertical,
symbolInstance.placedVerticalTextIndex,
symbolInstance.verticalGlyphQuads(),
canonical,
lastAddedSection);
}
assert(lastAddedSection); // True, as hasText == true;
updatePaintPropertiesForSection(*bucket, feature, *lastAddedSection, canonical);
}
symbolInstance.releaseSharedData();
}
if (showCollisionBoxes) {
addToDebugBuffers(*bucket);
}
if (bucket->hasData()){
for (const auto& pair : layerPaintProperties) {
if (!firstLoad) {
bucket->justReloaded = true;
}
renderData.emplace(pair.first, LayerRenderData{bucket, pair.second});
}
}
}
void SymbolLayout::updatePaintPropertiesForSection(SymbolBucket& bucket,
const SymbolFeature& feature,
std::size_t sectionIndex,
const CanonicalTileID& canonical) {
const auto& formattedSection = sectionOptionsToValue((*feature.formattedText).sectionAt(sectionIndex));
for (auto& pair : bucket.paintProperties) {
pair.second.textBinders.populateVertexVectors(
feature, bucket.text.vertices.elements(), feature.index, {}, {}, canonical, formattedSection);
}
}
std::size_t SymbolLayout::addSymbolGlyphQuads(SymbolBucket& bucket,
SymbolInstance& symbolInstance,
const SymbolFeature& feature,
WritingModeType writingMode,
optional<size_t>& placedIndex,
const SymbolQuads& glyphQuads,
const CanonicalTileID& canonical,
optional<std::size_t> lastAddedSection) {
const Range<float> sizeData = bucket.textSizeBinder->getVertexSizeData(feature);
const bool hasFormatSectionOverrides = bucket.hasFormatSectionOverrides();
const auto& placedIconIndex = writingMode == WritingModeType::Vertical ? symbolInstance.placedVerticalIconIndex : symbolInstance.placedIconIndex;
bucket.text.placedSymbols.emplace_back(symbolInstance.anchor.point,
symbolInstance.anchor.segment.value_or(0u),
sizeData.min,
sizeData.max,
symbolInstance.textOffset,
writingMode,
symbolInstance.line(),
calculateTileDistances(symbolInstance.line(), symbolInstance.anchor),
placedIconIndex);
placedIndex = bucket.text.placedSymbols.size() - 1;
PlacedSymbol& placedSymbol = bucket.text.placedSymbols.back();
placedSymbol.angle = (allowVerticalPlacement && writingMode == WritingModeType::Vertical) ? M_PI_2 : 0;
bool firstSymbol = true;
for (const auto& symbolQuad : glyphQuads) {
if (hasFormatSectionOverrides) {
if (lastAddedSection && *lastAddedSection != symbolQuad.sectionIndex) {
updatePaintPropertiesForSection(bucket, feature, *lastAddedSection, canonical);
}
lastAddedSection = symbolQuad.sectionIndex;
}
size_t index = addSymbol(bucket.text, sizeData, symbolQuad, symbolInstance.anchor, placedSymbol, feature.sortKey);
if (firstSymbol) {
placedSymbol.vertexStartIndex = index;
firstSymbol = false;
}
}
return lastAddedSection ? *lastAddedSection : 0u;
}
size_t SymbolLayout::addSymbol(SymbolBucket::Buffer& buffer,
const Range<float> sizeData,
const SymbolQuad& symbol,
const Anchor& labelAnchor,
PlacedSymbol& placedSymbol,
float sortKey) {
constexpr const uint16_t vertexLength = 4;
const auto &tl = symbol.tl;
const auto &tr = symbol.tr;
const auto &bl = symbol.bl;
const auto &br = symbol.br;
const auto &tex = symbol.tex;
const auto& pixelOffsetTL = symbol.pixelOffsetTL;
const auto& pixelOffsetBR = symbol.pixelOffsetBR;
const auto& minFontScale = symbol.minFontScale;
if (buffer.segments.empty() ||
buffer.segments.back().vertexLength + vertexLength > std::numeric_limits<uint16_t>::max() ||
std::fabs(buffer.segments.back().sortKey - sortKey) > std::numeric_limits<float>::epsilon()) {
buffer.segments.emplace_back(buffer.vertices.elements(), buffer.triangles.elements(), 0ul, 0ul, sortKey);
}
// We're generating triangle fans, so we always start with the first
// coordinate in this polygon.
auto& segment = buffer.segments.back();
assert(segment.vertexLength <= std::numeric_limits<uint16_t>::max());
uint16_t index = segment.vertexLength;
// coordinates (2 triangles)
buffer.vertices.emplace_back(SymbolSDFIconProgram::layoutVertex(labelAnchor.point,
tl,
symbol.glyphOffset.y,
tex.x,
tex.y,
sizeData,
symbol.isSDF,
pixelOffsetTL,
minFontScale));
buffer.vertices.emplace_back(SymbolSDFIconProgram::layoutVertex(labelAnchor.point,
tr,
symbol.glyphOffset.y,
tex.x + tex.w,
tex.y,
sizeData,
symbol.isSDF,
{pixelOffsetBR.x, pixelOffsetTL.y},
minFontScale));
buffer.vertices.emplace_back(SymbolSDFIconProgram::layoutVertex(labelAnchor.point,
bl,
symbol.glyphOffset.y,
tex.x,
tex.y + tex.h,
sizeData,