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_backend_agg_wrapper.cpp
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287 lines (255 loc) · 10.5 KB
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#include <pybind11/pybind11.h>
#include <pybind11/numpy.h>
#include <pybind11/stl.h>
#include "mplutils.h"
#include "py_converters.h"
#include "_backend_agg.h"
namespace py = pybind11;
using namespace pybind11::literals;
/**********************************************************************
* BufferRegion
* */
/* TODO: This doesn't seem to be used internally. Remove? */
static void
PyBufferRegion_set_x(BufferRegion *self, int x)
{
self->get_rect().x1 = x;
}
static void
PyBufferRegion_set_y(BufferRegion *self, int y)
{
self->get_rect().y1 = y;
}
static py::object
PyBufferRegion_get_extents(BufferRegion *self)
{
agg::rect_i rect = self->get_rect();
return py::make_tuple(rect.x1, rect.y1, rect.x2, rect.y2);
}
/**********************************************************************
* RendererAgg
* */
static void
PyRendererAgg_draw_path(RendererAgg *self,
GCAgg &gc,
mpl::PathIterator path,
agg::trans_affine trans,
py::object rgbFace)
{
agg::rgba face = rgbFace.cast<agg::rgba>();
if (!rgbFace.is_none()) {
if (gc.forced_alpha || rgbFace.cast<py::sequence>().size() == 3) {
face.a = gc.alpha;
}
}
self->draw_path(gc, path, trans, face);
}
static void
PyRendererAgg_draw_text_image(RendererAgg *self,
py::array_t<agg::int8u, py::array::c_style | py::array::forcecast> image_obj,
std::variant<int, double> vx,
std::variant<int, double> vy,
double angle,
GCAgg &gc)
{
int x, y;
if (auto value = std::get_if<double>(&vx)) {
auto api = py::module_::import("matplotlib._api");
auto warn = api.attr("warn_deprecated");
warn("since"_a="3.10", "name"_a="x", "obj_type"_a="parameter as float",
"alternative"_a="int(x)");
x = static_cast<int>(*value);
} else if (auto value = std::get_if<int>(&vx)) {
x = *value;
} else {
throw std::runtime_error("Should not happen");
}
if (auto value = std::get_if<double>(&vy)) {
auto api = py::module_::import("matplotlib._api");
auto warn = api.attr("warn_deprecated");
warn("since"_a="3.10", "name"_a="y", "obj_type"_a="parameter as float",
"alternative"_a="int(y)");
y = static_cast<int>(*value);
} else if (auto value = std::get_if<int>(&vy)) {
y = *value;
} else {
throw std::runtime_error("Should not happen");
}
// TODO: This really shouldn't be mutable, but Agg's renderer buffers aren't const.
auto image = image_obj.mutable_unchecked<2>();
self->draw_text_image(gc, image, x, y, angle);
}
static void
PyRendererAgg_draw_markers(RendererAgg *self,
GCAgg &gc,
mpl::PathIterator marker_path,
agg::trans_affine marker_path_trans,
mpl::PathIterator path,
agg::trans_affine trans,
py::object rgbFace)
{
agg::rgba face = rgbFace.cast<agg::rgba>();
if (!rgbFace.is_none()) {
if (gc.forced_alpha || rgbFace.cast<py::sequence>().size() == 3) {
face.a = gc.alpha;
}
}
self->draw_markers(gc, marker_path, marker_path_trans, path, trans, face);
}
static void
PyRendererAgg_draw_image(RendererAgg *self,
GCAgg &gc,
double x,
double y,
py::array_t<agg::int8u, py::array::c_style | py::array::forcecast> image_obj)
{
// TODO: This really shouldn't be mutable, but Agg's renderer buffers aren't const.
auto image = image_obj.mutable_unchecked<3>();
x = mpl_round(x);
y = mpl_round(y);
gc.alpha = 1.0;
self->draw_image(gc, x, y, image);
}
static void
PyRendererAgg_draw_path_collection(RendererAgg *self,
GCAgg &gc,
agg::trans_affine master_transform,
mpl::PathGenerator paths,
py::array_t<double> transforms_obj,
py::array_t<double> offsets_obj,
agg::trans_affine offset_trans,
py::array_t<double> facecolors_obj,
py::array_t<double> edgecolors_obj,
py::array_t<double> linewidths_obj,
DashesVector dashes,
py::array_t<uint8_t> antialiaseds_obj,
py::object Py_UNUSED(ignored_obj),
// offset position is no longer used
py::object Py_UNUSED(offset_position_obj),
py::array_t<double> hatchcolors_obj)
{
auto transforms = convert_transforms(transforms_obj);
auto offsets = convert_points(offsets_obj);
auto facecolors = convert_colors(facecolors_obj);
auto edgecolors = convert_colors(edgecolors_obj);
auto hatchcolors = convert_colors(hatchcolors_obj);
auto linewidths = linewidths_obj.unchecked<1>();
auto antialiaseds = antialiaseds_obj.unchecked<1>();
self->draw_path_collection(gc,
master_transform,
paths,
transforms,
offsets,
offset_trans,
facecolors,
edgecolors,
linewidths,
dashes,
antialiaseds,
hatchcolors);
}
static void
PyRendererAgg_draw_quad_mesh(RendererAgg *self,
GCAgg &gc,
agg::trans_affine master_transform,
unsigned int mesh_width,
unsigned int mesh_height,
py::array_t<double, py::array::c_style | py::array::forcecast> coordinates_obj,
py::array_t<double> offsets_obj,
agg::trans_affine offset_trans,
py::array_t<double> facecolors_obj,
bool antialiased,
py::array_t<double> edgecolors_obj)
{
auto coordinates = coordinates_obj.mutable_unchecked<3>();
auto offsets = convert_points(offsets_obj);
auto facecolors = convert_colors(facecolors_obj);
auto edgecolors = convert_colors(edgecolors_obj);
self->draw_quad_mesh(gc,
master_transform,
mesh_width,
mesh_height,
coordinates,
offsets,
offset_trans,
facecolors,
antialiased,
edgecolors);
}
static void
PyRendererAgg_draw_gouraud_triangles(RendererAgg *self,
GCAgg &gc,
py::array_t<double> points_obj,
py::array_t<double> colors_obj,
agg::trans_affine trans)
{
auto points = points_obj.unchecked<3>();
auto colors = colors_obj.unchecked<3>();
self->draw_gouraud_triangles(gc, points, colors, trans);
}
PYBIND11_MODULE(_backend_agg, m, py::mod_gil_not_used())
{
py::class_<RendererAgg>(m, "RendererAgg", py::buffer_protocol())
.def(py::init<unsigned int, unsigned int, double>(),
"width"_a, "height"_a, "dpi"_a)
.def("draw_path", &PyRendererAgg_draw_path,
"gc"_a, "path"_a, "trans"_a, "face"_a = nullptr)
.def("draw_markers", &PyRendererAgg_draw_markers,
"gc"_a, "marker_path"_a, "marker_path_trans"_a, "path"_a, "trans"_a,
"face"_a = nullptr)
.def("draw_text_image", &PyRendererAgg_draw_text_image,
"image"_a, "x"_a, "y"_a, "angle"_a, "gc"_a)
.def("draw_image", &PyRendererAgg_draw_image,
"gc"_a, "x"_a, "y"_a, "image"_a)
.def("draw_path_collection", &PyRendererAgg_draw_path_collection,
"gc"_a, "master_transform"_a, "paths"_a, "transforms"_a, "offsets"_a,
"offset_trans"_a, "facecolors"_a, "edgecolors"_a, "linewidths"_a,
"dashes"_a, "antialiaseds"_a, "ignored"_a, "offset_position"_a,
py::kw_only(), "hatchcolors"_a = py::array_t<double>().reshape({0, 4}))
.def("draw_quad_mesh", &PyRendererAgg_draw_quad_mesh,
"gc"_a, "master_transform"_a, "mesh_width"_a, "mesh_height"_a,
"coordinates"_a, "offsets"_a, "offset_trans"_a, "facecolors"_a,
"antialiased"_a, "edgecolors"_a)
.def("draw_gouraud_triangles", &PyRendererAgg_draw_gouraud_triangles,
"gc"_a, "points"_a, "colors"_a, "trans"_a = nullptr)
.def("clear", &RendererAgg::clear)
.def("copy_from_bbox", &RendererAgg::copy_from_bbox,
"bbox"_a)
.def("restore_region",
py::overload_cast<BufferRegion&>(&RendererAgg::restore_region),
"region"_a)
.def("restore_region",
py::overload_cast<BufferRegion&, int, int, int, int, int, int>(&RendererAgg::restore_region),
"region"_a, "xx1"_a, "yy1"_a, "xx2"_a, "yy2"_a, "x"_a, "y"_a)
.def_buffer([](RendererAgg *renderer) -> py::buffer_info {
std::vector<py::ssize_t> shape {
static_cast<py::ssize_t>(renderer->get_height()),
static_cast<py::ssize_t>(renderer->get_width()),
4
};
std::vector<py::ssize_t> strides {
static_cast<py::ssize_t>(renderer->get_width() * 4),
4,
1
};
return py::buffer_info(renderer->pixBuffer, shape, strides);
});
py::class_<BufferRegion>(m, "BufferRegion", py::buffer_protocol())
// BufferRegion is not constructible from Python, thus no py::init is added.
.def("set_x", &PyBufferRegion_set_x)
.def("set_y", &PyBufferRegion_set_y)
.def("get_extents", &PyBufferRegion_get_extents)
.def_buffer([](BufferRegion *buffer) -> py::buffer_info {
std::vector<py::ssize_t> shape {
buffer->get_height(),
buffer->get_width(),
4
};
std::vector<py::ssize_t> strides {
buffer->get_width() * 4,
4,
1
};
return py::buffer_info(buffer->get_data(), shape, strides);
});
}
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