fix rotation and mirroring

now works with all vector shapes, even those with internal reference locations
that are negative. All shape locations are anchored to their 0,0 but they can
display pixels from negative coordinates if the shape's location on the screen
would have room for it.

Author: kvc0

shared-module/vectorio/VectorShape.c

@@ -14,17 +14,17 @@
 #include "shared-bindings/vectorio/Rectangle.h"
 
 // Lifecycle actions.
-// #define VECTORIO_SHAPE_DEBUG(...) (void)0
-#define VECTORIO_SHAPE_DEBUG(...) mp_printf(&mp_plat_print, __VA_ARGS__)
+#define VECTORIO_SHAPE_DEBUG(...) (void)0
+// #define VECTORIO_SHAPE_DEBUG(...) mp_printf(&mp_plat_print, __VA_ARGS__)
 
 
 // Used in both logging and ifdefs, for extra variables
 // #define VECTORIO_PERF(...) mp_printf(&mp_plat_print, __VA_ARGS__)
 
 
 // Really verbose.
-// #define VECTORIO_SHAPE_PIXEL_DEBUG(...) (void)0
-#define VECTORIO_SHAPE_PIXEL_DEBUG(...) mp_printf(&mp_plat_print, __VA_ARGS__)
+#define VECTORIO_SHAPE_PIXEL_DEBUG(...) (void)0
+// #define VECTORIO_SHAPE_PIXEL_DEBUG(...) mp_printf(&mp_plat_print, __VA_ARGS__)
 
 #define U32_TO_BINARY_FMT "%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c"
 #define U32_TO_BINARY(u32)  \
@@ -244,15 +244,8 @@ bool vectorio_vector_shape_fill_area(vectorio_vector_shape_t *self, const _displ
     displayio_input_pixel_t input_pixel;
     displayio_output_pixel_t output_pixel;
 
-    uint16_t width_px_indices;
-    uint16_t height_px_indices;
-    if (self->absolute_transform->transpose_xy) {
-        width_px_indices = displayio_area_height(&self->current_area) - 1;
-        height_px_indices = displayio_area_width(&self->current_area) - 1;
-    } else {
-        width_px_indices = displayio_area_width(&self->current_area) - 1;
-        height_px_indices = displayio_area_height(&self->current_area) - 1;
-    }
+    displayio_area_t shape_area;
+    self->ishape.get_area(self->ishape.shape, &shape_area);
 
     uint16_t mask_start_px = line_dirty_offset_px;
     for (input_pixel.y = overlap.y1; input_pixel.y < overlap.y2; ++input_pixel.y) {
@@ -275,22 +268,24 @@ bool vectorio_vector_shape_fill_area(vectorio_vector_shape_t *self, const _displ
             if (self->absolute_transform->transpose_xy) {
                 pixel_to_get_x = input_pixel.y - self->absolute_transform->y - self->absolute_transform->dy * self->x;
                 pixel_to_get_y = input_pixel.x - self->absolute_transform->x - self->absolute_transform->dx * self->y;
+                VECTORIO_SHAPE_PIXEL_DEBUG(" a(%3d, %3d)", pixel_to_get_x, pixel_to_get_y);
 
                 if (self->absolute_transform->mirror_x) {
-                    pixel_to_get_y = height_px_indices - pixel_to_get_y;
+                    pixel_to_get_y = shape_area.y2 - 1 - (pixel_to_get_y - shape_area.y1);
                 }
                 if (self->absolute_transform->mirror_y) {
-                    pixel_to_get_x = width_px_indices - pixel_to_get_x;
+                    pixel_to_get_x = shape_area.x2 - 1 - (pixel_to_get_x - shape_area.x1);
                 }
             } else {
                 pixel_to_get_x = input_pixel.x - self->absolute_transform->x - self->absolute_transform->dx * self->x;
                 pixel_to_get_y = input_pixel.y - self->absolute_transform->y - self->absolute_transform->dy * self->y;
+                VECTORIO_SHAPE_PIXEL_DEBUG(" a(%3d, %3d)", pixel_to_get_x, pixel_to_get_y);
 
                 if (self->absolute_transform->mirror_x) {
-                    pixel_to_get_x = width_px_indices - pixel_to_get_x;
+                    pixel_to_get_x = shape_area.x2 - 1 - (pixel_to_get_x - shape_area.x1);
                 }
                 if (self->absolute_transform->mirror_y) {
-                    pixel_to_get_y = height_px_indices - pixel_to_get_y;
+                    pixel_to_get_y = shape_area.y2 - 1 - (pixel_to_get_y - shape_area.y1);
                 }
             }