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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/painter.hpp>
#include <mbgl/renderer/render_tile.hpp>
#include <mbgl/renderer/sources/render_image_source.hpp>
#include <mbgl/renderer/tile_parameters.hpp>
#include <mbgl/util/tile_coordinate.hpp>
#include <mbgl/util/tile_cover.hpp>
namespace mbgl {
using namespace style;
RenderImageSource::RenderImageSource(Immutable<style::ImageSource::Impl> impl_)
: RenderSource(impl_), shouldRender(false) {
}
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(Painter& painter) {
if (!isLoaded()) {
return;
}
matrices.clear();
for (size_t i = 0; i < tileIds.size(); i++) {
mat4 matrix;
matrix::identity(matrix);
painter.state.matrixFor(matrix, tileIds[i]);
matrix::multiply(matrix, painter.projMatrix, matrix);
matrices.push_back(matrix);
}
if (bucket->needsUpload() && shouldRender) {
bucket->upload(painter.context);
}
}
void RenderImageSource::finishRender(Painter& painter) {
if (!isLoaded() || !shouldRender) {
return;
}
for (auto matrix : matrices) {
painter.renderTileDebug(matrix);
}
}
std::unordered_map<std::string, std::vector<Feature>>
RenderImageSource::queryRenderedFeatures(const ScreenLineString&,
const TransformState&,
const RenderStyle&,
const RenderedQueryOptions&) const {
return {};
}
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) {
std::swap(baseImpl, baseImpl_);
enabled = needsRendering;
auto transformState = parameters.transformState;
auto size = transformState.getSize();
double viewportHeight = size.height;
auto coords = impl().getCoordinates();
// Compute the screen coordinates at wrap=0 for the given LatLng
ScreenCoordinate nePixel = { -INFINITY, -INFINITY };
ScreenCoordinate swPixel = { INFINITY, INFINITY };
for (LatLng latLng : coords) {
ScreenCoordinate pixel = transformState.latLngToScreenCoordinate(latLng);
swPixel.x = std::min(swPixel.x, pixel.x);
nePixel.x = std::max(nePixel.x, pixel.x);
swPixel.y = std::min(swPixel.y, viewportHeight - pixel.y);
nePixel.y = std::max(nePixel.y, viewportHeight - pixel.y);
}
double width = nePixel.x - swPixel.x;
double height = nePixel.y - swPixel.y;
// Don't bother drawing the ImageSource unless it occupies >4 screen pixels
shouldRender = (width * height > 4);
if (!shouldRender) {
return;
}
// Calculate the optimum zoom level to determine the tile ids to use for transforms
double minScale = INFINITY;
if (width > 0 || height > 0) {
double scaleX = double(size.width) / width;
double scaleY = double(size.height) / height;
minScale = util::min(scaleX, scaleY);
}
double zoom = transformState.getZoom() + util::log2(minScale);
zoom = util::clamp(zoom, transformState.getMinZoom(), transformState.getMaxZoom());
auto imageBounds = LatLngBounds::hull(coords[0], coords[1]);
imageBounds.extend(coords[2]);
imageBounds.extend(coords[3]);
auto tileCover = util::tileCover(imageBounds, ::floor(zoom));
tileIds.clear();
tileIds.push_back(tileCover[0]);
// 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 });
}
}
// Calculate Geometry Coordinates based on tile cover at ideal zoom
GeometryCoordinates geomCoords;
for (auto latLng : coords) {
auto tc = TileCoordinate::fromLatLng(0, latLng);
auto gc = TileCoordinate::toGeometryCoordinate(tileIds[0], tc.p);
geomCoords.push_back(gc);
}
const UnassociatedImage& image = impl().getImage();
if (!image.valid()) {
return;
}
if (!bucket || image != bucket->image) {
bucket = std::make_unique<RasterBucket>(image.clone());
} else {
bucket->clear();
}
// 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 }, { 32767, 0 }));
bucket->vertices.emplace_back(
RasterProgram::layoutVertex({ geomCoords[3].x, geomCoords[3].y }, { 0, 32767 }));
bucket->vertices.emplace_back(
RasterProgram::layoutVertex({ geomCoords[2].x, geomCoords[2].y }, { 32767, 32767 }));
bucket->indices.emplace_back(0, 1, 2);
bucket->indices.emplace_back(1, 2, 3);
bucket->segments.emplace_back(gl::SegmentInfo{ 0, 0, 4, 6 });
}
void RenderImageSource::render(Painter& painter,
PaintParameters& parameters,
const RenderLayer& layer) {
if (isLoaded() && !bucket->needsUpload() && shouldRender) {
for (auto matrix : matrices) {
bucket->render(painter, parameters, layer, matrix);
}
}
}
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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