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#include <mbgl/map/transform_state.hpp>
#include <mbgl/math/log2.hpp>
#include <mbgl/renderer/buckets/raster_bucket.hpp>
#include <mbgl/renderer/paint_parameters.hpp>
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/renderer/sources/render_image_source.hpp>
#include <mbgl/renderer/tile_parameters.hpp>
#include <mbgl/renderer/render_static_data.hpp>
#include <mbgl/programs/programs.hpp>
#include <mbgl/util/tile_coordinate.hpp>
#include <mbgl/util/tile_cover.hpp>
#include <mbgl/util/logging.hpp>
#include <mbgl/util/constants.hpp>
namespace mbgl {
using namespace style;
RenderImageSource::RenderImageSource(Immutable<style::ImageSource::Impl> impl_)
: RenderSource(impl_) {
}
RenderImageSource::~RenderImageSource() = default;
const style::ImageSource::Impl& RenderImageSource::impl() const {
return static_cast<const style::ImageSource::Impl&>(*baseImpl);
}
bool RenderImageSource::isLoaded() const {
return !!bucket;
}
void RenderImageSource::startRender(PaintParameters& parameters) {
if (!isLoaded()) {
return;
}
matrices.clear();
for (size_t i = 0; i < tileIds.size(); i++) {
mat4 matrix;
matrix::identity(matrix);
parameters.state.matrixFor(matrix, tileIds[i]);
matrix::multiply(matrix, parameters.alignedProjMatrix, matrix);
matrices.push_back(matrix);
}
if (bucket->needsUpload()) {
bucket->upload(parameters.context);
}
}
void RenderImageSource::finishRender(PaintParameters& parameters) {
if (!isLoaded() || !(parameters.debugOptions & MapDebugOptions::TileBorders)) {
return;
}
static const style::Properties<>::PossiblyEvaluated properties {};
static const DebugProgram::PaintPropertyBinders paintAttributeData(properties, 0);
auto& programInstance = parameters.programs.debug;
for (auto matrix : matrices) {
programInstance.draw(
parameters.context,
gl::LineStrip { 4.0f * parameters.pixelRatio },
gl::DepthMode::disabled(),
gl::StencilMode::disabled(),
gl::ColorMode::unblended(),
parameters.staticData.tileBorderIndexBuffer,
parameters.staticData.tileBorderSegments,
programInstance.computeAllUniformValues(
DebugProgram::UniformValues {
uniforms::u_matrix::Value{ matrix },
uniforms::u_color::Value{ Color::red() }
},
paintAttributeData,
properties,
parameters.state.getZoom()
),
programInstance.computeAllAttributeBindings(
parameters.staticData.tileVertexBuffer,
paintAttributeData,
properties
),
"image"
);
}
}
std::unordered_map<std::string, std::vector<Feature>>
RenderImageSource::queryRenderedFeatures(const ScreenLineString&,
const TransformState&,
const std::vector<const RenderLayer*>&,
const RenderedQueryOptions&,
const mat4&) const {
return std::unordered_map<std::string, std::vector<Feature>> {};
}
std::vector<Feature> RenderImageSource::querySourceFeatures(const SourceQueryOptions&) const {
return {};
}
void RenderImageSource::update(Immutable<style::Source::Impl> baseImpl_,
const std::vector<Immutable<Layer::Impl>>&,
const bool needsRendering,
const bool,
const TileParameters& parameters) {
enabled = needsRendering;
if (!needsRendering) {
return;
}
auto transformState = parameters.transformState;
std::swap(baseImpl, baseImpl_);
auto coords = impl().getCoordinates();
std::shared_ptr<PremultipliedImage> image = impl().getImage();
if (!image || !image->valid()) {
enabled = false;
return;
}
// Compute the z0 tile coordinates for the given LatLngs
TileCoordinatePoint nePoint = { -INFINITY, -INFINITY };
TileCoordinatePoint swPoint = { INFINITY, INFINITY };
std::vector<TileCoordinatePoint> tileCoordinates;
for (LatLng latLng : coords) {
auto point = TileCoordinate::fromLatLng(0, latLng).p;
tileCoordinates.push_back(point);
swPoint.x = std::min(swPoint.x, point.x);
nePoint.x = std::max(nePoint.x, point.x);
swPoint.y = std::min(swPoint.y, point.y);
nePoint.y = std::max(nePoint.y, point.y);
}
// Calculate the optimum zoom level to determine the tile ids to use for transforms
auto dx = nePoint.x - swPoint.x;
auto dy = nePoint.y - swPoint.y;
auto dMax = std::max(dx, dy);
double zoom = std::max(0.0, std::floor(-util::log2(dMax)));
// Only enable if the long side of the image is > 2 pixels. Resulting in a
// display of at least 2 x 1 px image
// A tile coordinate unit represents the length of one tile (tileSize) at a given zoom.
// To convert a tile coordinate to pixels, multiply by tileSize.
// Here dMax is in z0 tile units, so we also scale by 2^z to match current zoom.
enabled = dMax * std::pow(2.0, transformState.getZoom()) * util::tileSize > 2.0;
if (!enabled) {
return;
}
auto imageBounds = LatLngBounds::hull(coords[0], coords[1]);
imageBounds.extend(coords[2]);
imageBounds.extend(coords[3]);
auto tileCover = util::tileCover(imageBounds, zoom);
tileIds.clear();
tileIds.push_back(tileCover[0]);
bool hasVisibleTile = false;
// Add additional wrapped tile ids if neccessary
auto idealTiles = util::tileCover(transformState, transformState.getZoom());
for (auto tile : idealTiles) {
if (tile.wrap != 0 && tileCover[0].canonical.isChildOf(tile.canonical)) {
tileIds.push_back({ tile.wrap, tileCover[0].canonical });
hasVisibleTile = true;
}
else if (!hasVisibleTile) {
for (auto coveringTile: tileCover) {
if(coveringTile.canonical == tile.canonical ||
coveringTile.canonical.isChildOf(tile.canonical) ||
tile.canonical.isChildOf(coveringTile.canonical)) {
hasVisibleTile = true;
}
}
}
}
enabled = hasVisibleTile;
if (!enabled) {
return;
}
// Calculate Geometry Coordinates based on tile cover at ideal zoom
GeometryCoordinates geomCoords;
for (auto tileCoords : tileCoordinates) {
auto gc = TileCoordinate::toGeometryCoordinate(tileIds[0], tileCoords);
geomCoords.push_back(gc);
}
if (!bucket) {
bucket = std::make_unique<RasterBucket>(image);
} else {
bucket->clear();
if (image != bucket->image) {
bucket->setImage(image);
}
}
// Set Bucket Vertices, Indices, and segments
bucket->vertices.emplace_back(
RasterProgram::layoutVertex({ geomCoords[0].x, geomCoords[0].y }, { 0, 0 }));
bucket->vertices.emplace_back(
RasterProgram::layoutVertex({ geomCoords[1].x, geomCoords[1].y }, { util::EXTENT, 0 }));
bucket->vertices.emplace_back(
RasterProgram::layoutVertex({ geomCoords[3].x, geomCoords[3].y }, { 0, util::EXTENT }));
bucket->vertices.emplace_back(
RasterProgram::layoutVertex({ geomCoords[2].x, geomCoords[2].y }, { util::EXTENT, util::EXTENT }));
bucket->indices.emplace_back(0, 1, 2);
bucket->indices.emplace_back(1, 2, 3);
bucket->segments.emplace_back(0, 0, 4, 6);
}
void RenderImageSource::dumpDebugLogs() const {
Log::Info(Event::General, "RenderImageSource::id: %s", impl().id.c_str());
Log::Info(Event::General, "RenderImageSource::loaded: %s", isLoaded() ? "yes" : "no");
}
} // namespace mbgl
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