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#include <mbgl/text/quads.hpp>
#include <mbgl/text/shaping.hpp>
#include <mbgl/geometry/anchor.hpp>
#include <mbgl/layer/symbol_layer.hpp>
#include <mbgl/util/math.hpp>
#include <cassert>
namespace mbgl {
const float globalMinScale = 0.5f; // underscale by 1 zoom level
SymbolQuads getIconQuads(Anchor& anchor, const PositionedIcon& shapedIcon,
const std::vector<Coordinate>& line, const SymbolLayoutProperties& layout,
const bool alongLine) {
const float border = 1.0;
auto left = shapedIcon.left - border;
auto right = left + shapedIcon.image.w;
auto top = shapedIcon.top - border;
auto bottom = top + shapedIcon.image.h;
vec2<float> tl{left, top};
vec2<float> tr{right, top};
vec2<float> br{right, bottom};
vec2<float> bl{left, bottom};
float angle = layout.icon.rotate * M_PI / 180.0f;
if (alongLine) {
assert(static_cast<unsigned int>(anchor.segment) < line.size());
const Coordinate &prev= line[anchor.segment];
if (anchor.y == prev.y && anchor.x == prev.x &&
static_cast<unsigned int>(anchor.segment + 1) < line.size()) {
const Coordinate &next= line[anchor.segment + 1];
angle += std::atan2(anchor.y - next.y, anchor.x - next.x) + M_PI;
} else {
angle += std::atan2(anchor.y - prev.y, anchor.x - prev.x);
}
}
if (angle) {
// Compute the transformation matrix.
float angle_sin = std::sin(angle);
float angle_cos = std::cos(angle);
std::array<float, 4> matrix = {{angle_cos, -angle_sin, angle_sin, angle_cos}};
tl = tl.matMul(matrix);
tr = tr.matMul(matrix);
bl = bl.matMul(matrix);
br = br.matMul(matrix);
}
SymbolQuads quads;
quads.emplace_back(tl, tr, bl, br, shapedIcon.image, 0, anchor, globalMinScale, std::numeric_limits<float>::infinity());
return quads;
}
struct GlyphInstance {
explicit GlyphInstance(const vec2<float> &anchorPoint_) : anchorPoint(anchorPoint_) {}
explicit GlyphInstance(const vec2<float> &anchorPoint_, float offset_, float minScale_, float maxScale_,
float angle_)
: anchorPoint(anchorPoint_), offset(offset_), minScale(minScale_), maxScale(maxScale_), angle(angle_) {}
const vec2<float> anchorPoint;
const float offset = 0.0f;
const float minScale = globalMinScale;
const float maxScale = std::numeric_limits<float>::infinity();
const float angle = 0.0f;
};
typedef std::vector<GlyphInstance> GlyphInstances;
void getSegmentGlyphs(std::back_insert_iterator<GlyphInstances> glyphs, Anchor &anchor,
float offset, const std::vector<Coordinate> &line, int segment, bool forward) {
const bool upsideDown = !forward;
if (offset < 0)
forward = !forward;
if (forward)
segment++;
assert((int)line.size() > segment);
vec2<float> end = line[segment];
vec2<float> newAnchorPoint = anchor;
float prevscale = std::numeric_limits<float>::infinity();
offset = std::fabs(offset);
const float placementScale = anchor.scale;
while (true) {
const float dist = util::dist<float>(newAnchorPoint, end);
const float scale = offset / dist;
float angle = std::atan2(end.y - newAnchorPoint.y, end.x - newAnchorPoint.x);
if (!forward)
angle += M_PI;
if (upsideDown)
angle += M_PI;
glyphs = GlyphInstance{
/* anchor */ newAnchorPoint,
/* offset */ static_cast<float>(upsideDown ? M_PI : 0.0),
/* minScale */ scale,
/* maxScale */ prevscale,
/* angle */ static_cast<float>(std::fmod((angle + 2.0 * M_PI), (2.0 * M_PI)))};
if (scale <= placementScale)
break;
newAnchorPoint = end;
// skip duplicate nodes
while (newAnchorPoint == end) {
segment += forward ? 1 : -1;
if ((int)line.size() <= segment || segment < 0) {
anchor.scale = scale;
return;
}
end = line[segment];
}
vec2<float> normal = util::normal<float>(newAnchorPoint, end) * dist;
newAnchorPoint = newAnchorPoint - normal;
prevscale = scale;
}
}
SymbolQuads getGlyphQuads(Anchor& anchor, const Shaping& shapedText,
const float boxScale, const std::vector<Coordinate>& line, const SymbolLayoutProperties& layout,
const bool alongLine, const GlyphPositions& face) {
const float textRotate = layout.text.rotate * M_PI / 180;
const bool keepUpright = layout.text.keepUpright;
SymbolQuads quads;
for (const PositionedGlyph &positionedGlyph: shapedText.positionedGlyphs) {
auto face_it = face.find(positionedGlyph.glyph);
if (face_it == face.end())
continue;
const Glyph &glyph = face_it->second;
const Rect<uint16_t> &rect = glyph.rect;
if (!glyph)
continue;
if (!rect.hasArea())
continue;
const float centerX = (positionedGlyph.x + glyph.metrics.advance / 2.0f) * boxScale;
GlyphInstances glyphInstances;
if (alongLine) {
getSegmentGlyphs(std::back_inserter(glyphInstances), anchor, centerX, line, anchor.segment, true);
if (keepUpright)
getSegmentGlyphs(std::back_inserter(glyphInstances), anchor, centerX, line, anchor.segment, false);
} else {
glyphInstances.emplace_back(GlyphInstance{anchor});
}
// The rects have an addditional buffer that is not included in their size;
const float glyphPadding = 1.0f;
const float rectBuffer = 3.0f + glyphPadding;
const float x1 = positionedGlyph.x + glyph.metrics.left - rectBuffer;
const float y1 = positionedGlyph.y - glyph.metrics.top - rectBuffer;
const float x2 = x1 + rect.w;
const float y2 = y1 + rect.h;
const vec2<float> otl{x1, y1};
const vec2<float> otr{x2, y1};
const vec2<float> obl{x1, y2};
const vec2<float> obr{x2, y2};
for (const GlyphInstance &instance : glyphInstances) {
vec2<float> tl = otl;
vec2<float> tr = otr;
vec2<float> bl = obl;
vec2<float> br = obr;
const float angle = instance.angle + textRotate;
if (angle) {
// Compute the transformation matrix.
float angle_sin = std::sin(angle);
float angle_cos = std::cos(angle);
std::array<float, 4> matrix = {{angle_cos, -angle_sin, angle_sin, angle_cos}};
tl = tl.matMul(matrix);
tr = tr.matMul(matrix);
bl = bl.matMul(matrix);
br = br.matMul(matrix);
}
// Prevent label from extending past the end of the line
const float glyphMinScale = std::max(instance.minScale, anchor.scale);
const float glyphAngle = std::fmod((anchor.angle + textRotate + instance.offset + 2 * M_PI), (2 * M_PI));
quads.emplace_back(tl, tr, bl, br, rect, glyphAngle, instance.anchorPoint, glyphMinScale, instance.maxScale);
}
}
return quads;
}
} // namespace mbgl
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