#include "stdlib.h"

#include "shared-module/vectorio/__init__.h"

#include "shared-bindings/vectorio/VectorShape.h"

#include "py/misc.h"

#include "py/runtime.h"

#include "shared-bindings/time/__init__.h"

#include "shared-bindings/displayio/ColorConverter.h"

#include "shared-bindings/displayio/Palette.h"

#include "shared-bindings/vectorio/Circle.h"

#include "shared-bindings/vectorio/Polygon.h"

#include "shared-bindings/vectorio/Rectangle.h"

#define VECTORIO_SHAPE_DEBUG(...) (void)0

#define VECTORIO_SHAPE_PIXEL_DEBUG(...) (void)0

#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) \

(u32 & 0x80000000 ? '1' : '0'), \

(u32 & 0x40000000 ? '1' : '0'), \

(u32 & 0x20000000 ? '1' : '0'), \

(u32 & 0x10000000 ? '1' : '0'), \

(u32 & 0x8000000 ? '1' : '0'), \

(u32 & 0x4000000 ? '1' : '0'), \

(u32 & 0x2000000 ? '1' : '0'), \

(u32 & 0x1000000 ? '1' : '0'), \

(u32 & 0x800000 ? '1' : '0'), \

(u32 & 0x400000 ? '1' : '0'), \

(u32 & 0x200000 ? '1' : '0'), \

(u32 & 0x100000 ? '1' : '0'), \

(u32 & 0x80000 ? '1' : '0'), \

(u32 & 0x40000 ? '1' : '0'), \

(u32 & 0x20000 ? '1' : '0'), \

(u32 & 0x10000 ? '1' : '0'), \

(u32 & 0x8000 ? '1' : '0'), \

(u32 & 0x4000 ? '1' : '0'), \

(u32 & 0x2000 ? '1' : '0'), \

(u32 & 0x1000 ? '1' : '0'), \

(u32 & 0x800 ? '1' : '0'), \

(u32 & 0x400 ? '1' : '0'), \

(u32 & 0x200 ? '1' : '0'), \

(u32 & 0x100 ? '1' : '0'), \

(u32 & 0x80 ? '1' : '0'), \

(u32 & 0x40 ? '1' : '0'), \

(u32 & 0x20 ? '1' : '0'), \

(u32 & 0x10 ? '1' : '0'), \

(u32 & 0x8 ? '1' : '0'), \

(u32 & 0x4 ? '1' : '0'), \

(u32 & 0x2 ? '1' : '0'), \

(u32 & 0x1 ? '1' : '0')

static void short_bound_check(mp_int_t i, qstr name) {

mp_arg_validate_int_range(i, SHRT_MIN, SHRT_MAX, name);

}

inline __attribute__((always_inline))

static void area_transpose(displayio_area_t *to_transpose) {

int16_t swap = to_transpose->y1;

to_transpose->y1 = to_transpose->x1;

to_transpose->x1 = swap;

swap = to_transpose->y2;

to_transpose->y2 = to_transpose->x2;

to_transpose->x2 = swap;

}

inline __attribute__((always_inline))

static void _get_screen_area(vectorio_vector_shape_t *self, displayio_area_t *out_area) {

VECTORIO_SHAPE_DEBUG("%p get_screen_area (%3d,%3d) tform:{x:%d y:%d dx:%d dy:%d scl:%d w:%d h:%d mx:%d my:%d tr:%d}", self, self->x, self->y,

self->absolute_transform->x, self->absolute_transform->y, self->absolute_transform->dx, self->absolute_transform->dy, self->absolute_transform->scale,

self->absolute_transform->width, self->absolute_transform->height, self->absolute_transform->mirror_x, self->absolute_transform->mirror_y, self->absolute_transform->transpose_xy

);

self->ishape.get_area(self->ishape.shape, out_area);

VECTORIO_SHAPE_DEBUG(" in:{(%5d,%5d), (%5d,%5d)}", out_area->x1, out_area->y1, out_area->x2, out_area->y2);

int16_t x;

int16_t y;

if (self->absolute_transform->transpose_xy) {

x = self->absolute_transform->x + self->absolute_transform->dx * self->y;

y = self->absolute_transform->y + self->absolute_transform->dy * self->x;

if (self->absolute_transform->dx < 1) {

out_area->y1 = out_area->y1 * -1 + 1;

out_area->y2 = out_area->y2 * -1 + 1;

}

if (self->absolute_transform->dy < 1) {

out_area->x1 = out_area->x1 * -1 + 1;

out_area->x2 = out_area->x2 * -1 + 1;

}

area_transpose(out_area);

} else {

x = self->absolute_transform->x + self->absolute_transform->dx * self->x;

y = self->absolute_transform->y + self->absolute_transform->dy * self->y;

if (self->absolute_transform->dx < 1) {

out_area->x1 = out_area->x1 * -1 + 1;

out_area->x2 = out_area->x2 * -1 + 1;

}

if (self->absolute_transform->dy < 1) {

out_area->y1 = out_area->y1 * -1 + 1;

out_area->y2 = out_area->y2 * -1 + 1;

}

}

displayio_area_canon(out_area);

displayio_area_shift(out_area, x, y);

VECTORIO_SHAPE_DEBUG(" out:{(%5d,%5d), (%5d,%5d)}\n", out_area->x1, out_area->y1, out_area->x2, out_area->y2);

}

static void screen_to_shape_coordinates(vectorio_vector_shape_t *self, uint16_t x, uint16_t y, int16_t *out_shape_x, int16_t *out_shape_y) {

if (self->absolute_transform->transpose_xy) {

*out_shape_x = y - self->absolute_transform->y - self->absolute_transform->dy * self->x;

*out_shape_y = x - self->absolute_transform->x - self->absolute_transform->dx * self->y;

VECTORIO_SHAPE_PIXEL_DEBUG(" a(%3d, %3d)", *out_shape_x, *out_shape_y);

if (self->absolute_transform->dx < 1) {

*out_shape_y *= -1;

}

if (self->absolute_transform->dy < 1) {

*out_shape_x *= -1;

}

VECTORIO_SHAPE_PIXEL_DEBUG(" b(%3d, %3d)", *out_shape_x, *out_shape_y);

} else {

*out_shape_x = x - self->absolute_transform->x - self->absolute_transform->dx * self->x;

*out_shape_y = y - self->absolute_transform->y - self->absolute_transform->dy * self->y;

VECTORIO_SHAPE_PIXEL_DEBUG(" a(%3d, %3d)", *out_shape_x, *out_shape_y);

if (self->absolute_transform->dx < 1) {

*out_shape_x *= -1;

}

if (self->absolute_transform->dy < 1) {

*out_shape_y *= -1;

}

VECTORIO_SHAPE_PIXEL_DEBUG(" b(%3d, %3d)", *out_shape_x, *out_shape_y);

// It's mirrored via dx. Maybe we need to add support for also separately mirroring?

// if (self->absolute_transform->mirror_x) {

// pixel_to_get_x = (shape_area.x2 - shape_area.x1) - (pixel_to_get_x - shape_area.x1) + shape_area.x1 - 1;

// }

// if (self->absolute_transform->mirror_y) {

// pixel_to_get_y = (shape_area.y2 - shape_area.y1) - (pixel_to_get_y - shape_area.y1) + +shape_area.y1 - 1;

// }

}

}

static void check_bounds_and_set_x(vectorio_vector_shape_t *self, mp_int_t x) {

short_bound_check(x, MP_QSTR_x);

self->x = x;

}

static void check_bounds_and_set_y(vectorio_vector_shape_t *self, mp_int_t y) {

short_bound_check(y, MP_QSTR_y);

self->y = y;

}

bool vectorio_vector_shape_get_dirty_area(vectorio_vector_shape_t *self, displayio_area_t *out_area) {

out_area->x1 = out_area->x2;

displayio_area_union(

&self->ephemeral_dirty_area,

&self->current_area,

out_area

);

return true; // For now just always redraw.

}

void common_hal_vectorio_vector_shape_set_dirty(void *vector_shape) {

vectorio_vector_shape_t *self = vector_shape;

// In screen space. Need to offset the shape space.

displayio_area_t current_area;

_get_screen_area(self, &current_area);

VECTORIO_SHAPE_DEBUG("%p shape_dirty new:{(%3d,%3d), (%3d,%3d)} dirty:{(%3d,%3d), (%3d,%3d)}",

self,

current_area.x1, current_area.y1, current_area.x2, current_area.y2,

self->ephemeral_dirty_area.x1, self->ephemeral_dirty_area.y1, self->ephemeral_dirty_area.x2, self->ephemeral_dirty_area.y2);

bool moved = !displayio_area_equal(&current_area, &self->current_area);

if (moved) {

displayio_area_union(&self->current_area, &self->ephemeral_dirty_area, &self->ephemeral_dirty_area);

VECTORIO_SHAPE_DEBUG(" stale:{(%3d,%3d), (%3d,%3d)} -> expanded:{(%3d,%3d), (%3d,%3d)}\n",

self->current_area.x1, self->current_area.y1, self->current_area.x2, self->current_area.y2,

self->ephemeral_dirty_area.x1, self->ephemeral_dirty_area.y1, self->ephemeral_dirty_area.x2, self->ephemeral_dirty_area.y2);

// Dirty area tracks the shape's footprint between draws. It's reset on refresh finish.

displayio_area_copy(&current_area, &self->current_area);

}

self->current_area_dirty = true;

}

void common_hal_vectorio_vector_shape_construct(vectorio_vector_shape_t *self,

vectorio_ishape_t ishape,

mp_obj_t pixel_shader, int32_t x, int32_t y) {

VECTORIO_SHAPE_DEBUG("%p vector_shape_construct x:%3d, y:%3d\n", self, x, y);

check_bounds_and_set_x(self, x);

check_bounds_and_set_y(self, y);

self->pixel_shader = pixel_shader;

self->ishape = ishape;

self->absolute_transform = &null_transform; // Critical to have a valid transform before getting screen area.

self->ephemeral_dirty_area.x1 = self->ephemeral_dirty_area.x2; // Cheat to set area to 0

self->ephemeral_dirty_area.next = NULL;

self->current_area_dirty = true;

_get_screen_area(self, &self->current_area);

}

bool common_hal_vectorio_vector_shape_contains(vectorio_vector_shape_t *self, mp_int_t x, mp_int_t y) {

VECTORIO_SHAPE_DEBUG("%p contains(%d, %d)", self);

short_bound_check(x, MP_QSTR_x);

short_bound_check(y, MP_QSTR_y);

int16_t shape_x;

int16_t shape_y;

screen_to_shape_coordinates(self, x, y, &shape_x, &shape_y);

bool shape_contains_coordinates = 0 != self->ishape.get_pixel(self->ishape.shape, shape_x, shape_y);

return shape_contains_coordinates;

}

mp_int_t common_hal_vectorio_vector_shape_get_x(vectorio_vector_shape_t *self) {

VECTORIO_SHAPE_DEBUG("%p get_x\n", self);

return self->x;

}

void common_hal_vectorio_vector_shape_set_x(vectorio_vector_shape_t *self, mp_int_t x) {

VECTORIO_SHAPE_DEBUG("%p set_x %d\n", self, x);

if (self->x == x) {

return;

}

check_bounds_and_set_x(self, x);

common_hal_vectorio_vector_shape_set_dirty(self);

}

mp_int_t common_hal_vectorio_vector_shape_get_y(vectorio_vector_shape_t *self) {

VECTORIO_SHAPE_DEBUG("%p get_y\n", self);

return self->y;

}

void common_hal_vectorio_vector_shape_set_y(vectorio_vector_shape_t *self, mp_int_t y) {

VECTORIO_SHAPE_DEBUG("%p set_y %d\n", self, y);

if (self->y == y) {

return;

}

check_bounds_and_set_y(self, y);

common_hal_vectorio_vector_shape_set_dirty(self);

}

mp_obj_tuple_t *common_hal_vectorio_vector_shape_get_location(vectorio_vector_shape_t *self) {

VECTORIO_SHAPE_DEBUG("%p get_location\n", self);

mp_obj_tuple_t *pair = MP_OBJ_TO_PTR(mp_obj_new_tuple(2, NULL));

pair->items[0] = mp_obj_new_int((mp_int_t)self->x);

pair->items[1] = mp_obj_new_int((mp_int_t)self->y);

return pair;

}

void common_hal_vectorio_vector_shape_set_location(vectorio_vector_shape_t *self, mp_obj_t xy) {

VECTORIO_SHAPE_DEBUG("%p set_location\n", self);

size_t tuple_len = 0;

mp_obj_t *tuple_items;

mp_obj_tuple_get(xy, &tuple_len, &tuple_items);

mp_arg_validate_length(tuple_len, 2, MP_QSTR_location);

mp_int_t x = mp_arg_validate_type_int(tuple_items[0], MP_QSTR_x);

mp_int_t y = mp_arg_validate_type_int(tuple_items[1], MP_QSTR_y);

bool dirty = false;

if (self->x != x) {

check_bounds_and_set_x(self, x);

dirty = true;

}

if (self->y != y) {

check_bounds_and_set_y(self, y);

dirty = true;

}

if (dirty) {

common_hal_vectorio_vector_shape_set_dirty(self);

}

}

mp_int_t common_hal_vectorio_vector_shape_get_hidden(vectorio_vector_shape_t *self) {

VECTORIO_SHAPE_DEBUG("%p get_hidden\n", self);

return self->hidden;

}

void common_hal_vectorio_vector_shape_set_hidden(vectorio_vector_shape_t *self, bool hidden) {

VECTORIO_SHAPE_DEBUG("%p set_hidden %d\n", self, x);

self->hidden = hidden;

common_hal_vectorio_vector_shape_set_dirty(self);

}

mp_obj_t common_hal_vectorio_vector_shape_get_pixel_shader(vectorio_vector_shape_t *self) {

VECTORIO_SHAPE_DEBUG("%p get_pixel_shader\n", self);

return self->pixel_shader;

}

void common_hal_vectorio_vector_shape_set_pixel_shader(vectorio_vector_shape_t *self, mp_obj_t pixel_shader) {

VECTORIO_SHAPE_DEBUG("%p set_pixel_shader\n", self);

self->pixel_shader = pixel_shader;

common_hal_vectorio_vector_shape_set_dirty(self);

}

bool vectorio_vector_shape_fill_area(vectorio_vector_shape_t *self, const _displayio_colorspace_t *colorspace, const displayio_area_t *area, uint32_t *mask, uint32_t *buffer) {

// Shape areas are relative to 0,0. This will allow rotation about a known axis.

// The consequence is that the area reported by the shape itself is _relative_ to 0,0.

// To make it relative to the VectorShape position, we must shift it.

// Pixels are drawn on the screen_area (shifted) coordinate space, while pixels are _determined_ from

// the shape_area (unshifted) space.

#ifdef VECTORIO_PERF

uint64_t start = common_hal_time_monotonic_ns();

uint64_t pixel_time = 0;

#endif

if (self->hidden) {

return false;

}

VECTORIO_SHAPE_DEBUG("%p fill_area: fill: {(%5d,%5d), (%5d,%5d)}",

self,

area->x1, area->y1, area->x2, area->y2

);

displayio_area_t overlap;

if (!displayio_area_compute_overlap(area, &self->current_area, &overlap)) {

VECTORIO_SHAPE_DEBUG(" no overlap\n");

return false;

}

VECTORIO_SHAPE_DEBUG(", overlap: {(%3d,%3d), (%3d,%3d)}", overlap.x1, overlap.y1, overlap.x2, overlap.y2);

bool full_coverage = displayio_area_equal(area, &overlap);

uint8_t pixels_per_byte = 8 / colorspace->depth;

VECTORIO_SHAPE_DEBUG(" xy:(%3d %3d) tform:{x:%d y:%d dx:%d dy:%d scl:%d w:%d h:%d mx:%d my:%d tr:%d}",

self->x, self->y,

self->absolute_transform->x, self->absolute_transform->y, self->absolute_transform->dx, self->absolute_transform->dy, self->absolute_transform->scale,

self->absolute_transform->width, self->absolute_transform->height, self->absolute_transform->mirror_x, self->absolute_transform->mirror_y, self->absolute_transform->transpose_xy

);

uint16_t linestride_px = displayio_area_width(area);

uint16_t line_dirty_offset_px = (overlap.y1 - area->y1) * linestride_px;

uint16_t column_dirty_offset_px = overlap.x1 - area->x1;

VECTORIO_SHAPE_DEBUG(", linestride:%3d line_offset:%3d col_offset:%3d depth:%2d ppb:%2d shape:%s",

linestride_px, line_dirty_offset_px, column_dirty_offset_px, colorspace->depth, pixels_per_byte, mp_obj_get_type_str(self->ishape.shape));

displayio_input_pixel_t input_pixel;

displayio_output_pixel_t output_pixel;

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) {

mask_start_px += column_dirty_offset_px;

for (input_pixel.x = overlap.x1; input_pixel.x < overlap.x2; ++input_pixel.x) {

// Check the mask first to see if the pixel has already been set.

uint16_t pixel_index = mask_start_px + (input_pixel.x - overlap.x1);

uint32_t *mask_doubleword = &(mask[pixel_index / 32]);

uint8_t mask_bit = pixel_index % 32;

VECTORIO_SHAPE_PIXEL_DEBUG("\n%p pixel_index: %5u mask_bit: %2u mask: "U32_TO_BINARY_FMT, self, pixel_index, mask_bit, U32_TO_BINARY(*mask_doubleword));

if ((*mask_doubleword & (1u << mask_bit)) != 0) {

VECTORIO_SHAPE_PIXEL_DEBUG(" masked");

continue;

}

output_pixel.pixel = 0;

// Cast input screen coordinates to shape coordinates to pick the pixel to draw

int16_t pixel_to_get_x;

int16_t pixel_to_get_y;

screen_to_shape_coordinates(self, input_pixel.x, input_pixel.y, &pixel_to_get_x, &pixel_to_get_y);

VECTORIO_SHAPE_PIXEL_DEBUG(" get_pixel %p (%3d, %3d) -> ( %3d, %3d )", self->ishape.shape, input_pixel.x, input_pixel.y, pixel_to_get_x, pixel_to_get_y);

#ifdef VECTORIO_PERF

uint64_t pre_pixel = common_hal_time_monotonic_ns();

#endif

input_pixel.pixel = self->ishape.get_pixel(self->ishape.shape, pixel_to_get_x, pixel_to_get_y);

#ifdef VECTORIO_PERF

uint64_t post_pixel = common_hal_time_monotonic_ns();

pixel_time += post_pixel - pre_pixel;

#endif

VECTORIO_SHAPE_PIXEL_DEBUG(" -> %d", input_pixel.pixel);

// vectorio shapes use 0 to mean "area is not covered."

// We can skip all the rest of the work for this pixel if it's not currently covered by the shape.

if (input_pixel.pixel == 0) {

VECTORIO_SHAPE_PIXEL_DEBUG(" (encountered transparent pixel; input area is not fully covered)");

full_coverage = false;

} else {

// Pixel is not transparent. Let's pull the pixel value index down to 0-base for more error-resistant palettes.

input_pixel.pixel -= 1;

output_pixel.opaque = true;

if (self->pixel_shader == mp_const_none) {

output_pixel.pixel = input_pixel.pixel;

} else if (mp_obj_is_type(self->pixel_shader, &displayio_palette_type)) {

displayio_palette_get_color(self->pixel_shader, colorspace, &input_pixel, &output_pixel);

} else if (mp_obj_is_type(self->pixel_shader, &displayio_colorconverter_type)) {

displayio_colorconverter_convert(self->pixel_shader, colorspace, &input_pixel, &output_pixel);

}

// We double-check this to fast-path the case when a pixel is not covered by the shape & not call the color converter unnecessarily.

if (!output_pixel.opaque) {

VECTORIO_SHAPE_PIXEL_DEBUG(" (encountered transparent pixel from colorconverter; input area is not fully covered)");

full_coverage = false;

}

*mask_doubleword |= 1u << mask_bit;

if (colorspace->depth == 16) {

VECTORIO_SHAPE_PIXEL_DEBUG(" buffer = %04x 16", output_pixel.pixel);

*(((uint16_t *)buffer) + pixel_index) = output_pixel.pixel;

} else if (colorspace->depth == 32) {

VECTORIO_SHAPE_PIXEL_DEBUG(" buffer = %04x 32", output_pixel.pixel);

*(((uint32_t *)buffer) + pixel_index) = output_pixel.pixel;

} else if (colorspace->depth == 8) {

VECTORIO_SHAPE_PIXEL_DEBUG(" buffer = %02x 8", output_pixel.pixel);

*(((uint8_t *)buffer) + pixel_index) = output_pixel.pixel;

} else if (colorspace->depth < 8) {

// Reorder the offsets to pack multiple rows into a byte (meaning they share a column).

if (!colorspace->pixels_in_byte_share_row) {

uint16_t row = pixel_index / linestride_px;

uint16_t col = pixel_index % linestride_px;

pixel_index = col * pixels_per_byte + (row / pixels_per_byte) * pixels_per_byte * linestride_px + row % pixels_per_byte;

}

uint8_t shift = (pixel_index % pixels_per_byte) * colorspace->depth;

if (colorspace->reverse_pixels_in_byte) {

// Reverse the shift by subtracting it from the leftmost shift.

shift = (pixels_per_byte - 1) * colorspace->depth - shift;

}

VECTORIO_SHAPE_PIXEL_DEBUG(" buffer = %2d %d", output_pixel.pixel, colorspace->depth);

((uint8_t *)buffer)[pixel_index / pixels_per_byte] |= output_pixel.pixel << shift;

}

}

}

mask_start_px += linestride_px - column_dirty_offset_px;

}

#ifdef VECTORIO_PERF

uint64_t end = common_hal_time_monotonic_ns();

uint32_t pixels = (overlap.x2 - overlap.x1) * (overlap.y2 - overlap.y1);

VECTORIO_PERF("draw %16s -> shape:{%4dpx, %4.1fms,%9.1fpps fill} shape_pixels:{%6.1fus total, %4.1fus/px}\n",

mp_obj_get_type_str(self->ishape.shape),

(overlap.x2 - overlap.x1) * (overlap.y2 - overlap.y1),

(double)((end - start) / 1000000.0),

(double)(MAX(1, pixels * (1000000000.0 / (end - start)))),

(double)(pixel_time / 1000.0),

(double)(pixel_time / 1000.0 / pixels)

);

#endif

VECTORIO_SHAPE_DEBUG(" -> pixels:%4d\n", (overlap.x2 - overlap.x1) * (overlap.y2 - overlap.y1));

return full_coverage;

}

void vectorio_vector_shape_finish_refresh(vectorio_vector_shape_t *self) {

if (displayio_area_empty(&self->ephemeral_dirty_area) && !self->current_area_dirty) {

return;

}

VECTORIO_SHAPE_DEBUG("%p finish_refresh was:{(%3d,%3d), (%3d,%3d)}\n", self, self->ephemeral_dirty_area.x1, self->ephemeral_dirty_area.y1, self->ephemeral_dirty_area.x2, self->ephemeral_dirty_area.y2);

// Reset dirty area to nothing

self->ephemeral_dirty_area.x1 = self->ephemeral_dirty_area.x2; // Cheat to set area to empty

self->ephemeral_dirty_area.next = NULL;

self->current_area_dirty = false; // We don't clear current area so we can remember what to clean up if we move

self->current_area.next = NULL;

VECTORIO_SHAPE_DEBUG("%p finish_refresh now:{(%3d,%3d), (%3d,%3d)}\n", self, self->ephemeral_dirty_area.x1, self->ephemeral_dirty_area.y1, self->ephemeral_dirty_area.x2, self->ephemeral_dirty_area.y2);

if (mp_obj_is_type(self->pixel_shader, &displayio_palette_type)) {

displayio_palette_finish_refresh(self->pixel_shader);

} else if (mp_obj_is_type(self->pixel_shader, &displayio_colorconverter_type)) {

displayio_colorconverter_finish_refresh(self->pixel_shader);

}

}

displayio_area_t *vectorio_vector_shape_get_refresh_areas(vectorio_vector_shape_t *self, displayio_area_t *tail) {

if (self->current_area_dirty

|| (mp_obj_is_type(self->pixel_shader, &displayio_palette_type) && displayio_palette_needs_refresh(self->pixel_shader))

|| (mp_obj_is_type(self->pixel_shader, &displayio_colorconverter_type) && displayio_colorconverter_needs_refresh(self->pixel_shader))

) {

if (!displayio_area_empty(&self->ephemeral_dirty_area)) {

// Both are dirty, check if we should combine the areas or draw separately

// Draws as few pixels as possible both when animations move short distances and large distances.

// The display core implementation currently doesn't combine areas to reduce redrawing of masked areas. If it does,

// this could be simplified to just return the 2 possibly overlapping areas.

displayio_area_t area_swap;

displayio_area_compute_overlap(&self->ephemeral_dirty_area, &self->current_area, &area_swap);

uint32_t overlap_size = displayio_area_size(&area_swap);

displayio_area_union(&self->ephemeral_dirty_area, &self->current_area, &area_swap); // Leave area_swap as the union area for later.

uint32_t union_size = displayio_area_size(&area_swap);

uint32_t current_size = displayio_area_size(&self->current_area);

uint32_t dirty_size = displayio_area_size(&self->ephemeral_dirty_area);

VECTORIO_SHAPE_DEBUG("%p get_refresh_area: dirty{(%3d,%3d), (%3d,%3d)} + current{(%3d,%3d), (%3d,%3d)} = union{(%3d,%3d), (%3d,%3d)}: union%d - dirty%d - curr%d + overlap%d = excluded%d : ", self,

self->ephemeral_dirty_area.x1, self->ephemeral_dirty_area.y1, self->ephemeral_dirty_area.x2, self->ephemeral_dirty_area.y2,

self->current_area.x1, self->current_area.y1, self->current_area.x2, self->current_area.y2,

area_swap.x1, area_swap.y1, area_swap.x2, area_swap.y2,

union_size, dirty_size, current_size, overlap_size, (int32_t)union_size - dirty_size - current_size + overlap_size

);

if ((int32_t)union_size - dirty_size - current_size + overlap_size <= MIN(dirty_size, current_size)) {

// The excluded / non-overlapping area from the disjoint dirty and current areas is smaller

// than the smallest area we need to draw. Redrawing the overlapping area would cost more

// than just drawing the union disjoint area once.

VECTORIO_SHAPE_DEBUG("combining to take disjoint area\n");

displayio_area_copy(&area_swap, &self->ephemeral_dirty_area);

} else {

// The excluded area between the 2 dirty areas is larger than the smallest dirty area. It would be

// more costly to combine these areas than possibly redraw some overlap.

VECTORIO_SHAPE_DEBUG("excluded area too large, drawing separate area\n");

self->current_area.next = tail;

tail = &self->current_area;

}

self->ephemeral_dirty_area.next = tail;

tail = &self->ephemeral_dirty_area;

} else {

self->current_area.next = tail;

tail = &self->current_area;

VECTORIO_SHAPE_DEBUG("%p get_refresh_area: redrawing current: {(%3d,%3d), (%3d,%3d)}\n", self, self->current_area.x1, self->current_area.y1, self->current_area.x2, self->current_area.y2);

}

} else if (!displayio_area_empty(&self->ephemeral_dirty_area)) {

self->ephemeral_dirty_area.next = tail;

tail = &self->ephemeral_dirty_area;

VECTORIO_SHAPE_DEBUG("%p get_refresh_area redrawing dirty: {(%3d,%3d), (%3d,%3d)}\n", self, self->ephemeral_dirty_area.x1, self->ephemeral_dirty_area.y1, self->ephemeral_dirty_area.x2, self->ephemeral_dirty_area.y2);

}

return tail;

}

void vectorio_vector_shape_update_transform(vectorio_vector_shape_t *self, displayio_buffer_transform_t *group_transform) {

self->absolute_transform = group_transform == NULL ? &null_transform : group_transform;

common_hal_vectorio_vector_shape_set_dirty(self);

}