Convert some Agg array_view to pybind11

This only does the simple ones that are not shared with the path
extension. Those more complex ones will be done separately.

Author: QuLogic

src/_backend_agg.h

@@ -10,6 +10,7 @@
 
 #include <cmath>
 #include <algorithm>
+#include <functional>
 
 #include "agg_alpha_mask_u8.h"
 #include "agg_conv_curve.h"
@@ -732,7 +733,7 @@ inline void RendererAgg::draw_text_image(GCAgg &gc, ImageArray &image, int x, in
     rendererBase.reset_clipping(true);
     if (angle != 0.0) {
         agg::rendering_buffer srcbuf(
-                image.data(), (unsigned)image.shape(1),
+                image.mutable_data(0, 0), (unsigned)image.shape(1),
                 (unsigned)image.shape(0), (unsigned)image.shape(1));
         agg::pixfmt_gray8 pixf_img(srcbuf);
 
@@ -832,8 +833,9 @@ inline void RendererAgg::draw_image(GCAgg &gc,
     bool has_clippath = render_clippath(gc.clippath.path, gc.clippath.trans, gc.snap_mode);
 
     agg::rendering_buffer buffer;
-    buffer.attach(
-        image.data(), (unsigned)image.shape(1), (unsigned)image.shape(0), -(int)image.shape(1) * 4);
+    buffer.attach(image.mutable_data(0, 0, 0),
+                  (unsigned)image.shape(1), (unsigned)image.shape(0),
+                  -(int)image.shape(1) * 4);
     pixfmt pixf(buffer);
 
     if (has_clippath) {
@@ -1249,8 +1251,8 @@ inline void RendererAgg::draw_gouraud_triangles(GCAgg &gc,
     bool has_clippath = render_clippath(gc.clippath.path, gc.clippath.trans, gc.snap_mode);
 
     for (int i = 0; i < points.shape(0); ++i) {
-        typename PointArray::sub_t point = points.subarray(i);
-        typename ColorArray::sub_t color = colors.subarray(i);
+        auto point = std::bind(points, i, std::placeholders::_1, std::placeholders::_2);
+        auto color = std::bind(colors, i, std::placeholders::_1, std::placeholders::_2);
 
         _draw_gouraud_triangle(point, color, trans, has_clippath);
     }

src/_backend_agg_wrapper.cpp

@@ -59,17 +59,14 @@ PyRendererAgg_draw_path(RendererAgg *self,
 
 static void
 PyRendererAgg_draw_text_image(RendererAgg *self,
-                              py::array_t<agg::int8u, py::array::c_style> image_obj,
+                              py::array_t<agg::int8u, py::array::c_style | py::array::forcecast> image_obj,
                               double x,
                               double y,
                               double angle,
                               GCAgg &gc)
 {
-    numpy::array_view<agg::int8u, 2> image;
-
-    if (!image.converter_contiguous(image_obj.ptr(), &image)) {
-        throw py::error_already_set();
-    }
+    // 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);
 }
@@ -98,13 +95,10 @@ PyRendererAgg_draw_image(RendererAgg *self,
                          GCAgg &gc,
                          double x,
                          double y,
-                         py::array_t<agg::int8u, py::array::c_style> image_obj)
+                         py::array_t<agg::int8u, py::array::c_style | py::array::forcecast> image_obj)
 {
-    numpy::array_view<agg::int8u, 3> image;
-
-    if (!image.set(image_obj.ptr())) {
-        throw py::error_already_set();
-    }
+    // 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);
@@ -179,21 +173,18 @@ PyRendererAgg_draw_quad_mesh(RendererAgg *self,
                              agg::trans_affine master_transform,
                              unsigned int mesh_width,
                              unsigned int mesh_height,
-                             py::object coordinates_obj,
+                             py::array_t<double, py::array::c_style | py::array::forcecast> coordinates_obj,
                              py::object offsets_obj,
                              agg::trans_affine offset_trans,
                              py::object facecolors_obj,
                              bool antialiased,
                              py::object edgecolors_obj)
 {
-    numpy::array_view<const double, 3> coordinates;
     numpy::array_view<const double, 2> offsets;
     numpy::array_view<const double, 2> facecolors;
     numpy::array_view<const double, 2> edgecolors;
 
-    if (!coordinates.converter(coordinates_obj.ptr(), &coordinates)) {
-        throw py::error_already_set();
-    }
+    auto coordinates = coordinates_obj.mutable_unchecked<3>();
     if (!convert_points(offsets_obj.ptr(), &offsets)) {
         throw py::error_already_set();
     }
@@ -219,19 +210,12 @@ PyRendererAgg_draw_quad_mesh(RendererAgg *self,
 static void
 PyRendererAgg_draw_gouraud_triangles(RendererAgg *self,
                                      GCAgg &gc,
-                                     py::object points_obj,
-                                     py::object colors_obj,
+                                     py::array_t<double> points_obj,
+                                     py::array_t<double> colors_obj,
                                      agg::trans_affine trans)
 {
-    numpy::array_view<const double, 3> points;
-    numpy::array_view<const double, 3> colors;
-
-    if (!points.converter(points_obj.ptr(), &points)) {
-        throw py::error_already_set();
-    }
-    if (!colors.converter(colors_obj.ptr(), &colors)) {
-        throw py::error_already_set();
-    }
+    auto points = points_obj.unchecked<3>();
+    auto colors = colors_obj.unchecked<3>();
 
     self->draw_gouraud_triangles(gc, points, colors, trans);
 }