gfxdraw_test.py

import unittest
import pygame
import pygame.gfxdraw
from pygame.locals import *
from pygame.tests.test_utils import SurfaceSubclass


def intensity(c, i):
    """Return color c changed by intensity i

    For 0 <= i <= 127 the color is a shade, with 0 being black, 127 being the
    unaltered color.

    For 128 <= i <= 255 the color is a tint, with 255 being white, 128 the
    unaltered color.

    """
    r, g, b = c[0:3]
    if 0 <= i <= 127:
        # Darken
        return ((r * i) // 127, (g * i) // 127, (b * i) // 127)
    # Lighten
    return (
        r + ((255 - r) * (255 - i)) // 127,
        g + ((255 - g) * (255 - i)) // 127,
        b + ((255 - b) * (255 - i)) // 127,
    )


class GfxdrawDefaultTest(unittest.TestCase):
    is_started = False

    foreground_color = (128, 64, 8)
    background_color = (255, 255, 255)

    def make_palette(base_color):
        """Return color palette that is various intensities of base_color"""
        # Need this function for Python 3.x so the base_color
        # is within the scope of the list comprehension.
        return [intensity(base_color, i) for i in range(0, 256)]

    default_palette = make_palette(foreground_color)

    default_size = (100, 100)

    def check_at(self, surf, posn, color):
        sc = surf.get_at(posn)
        fail_msg = "%s != %s at %s, bitsize: %i, flags: %i, masks: %s" % (
            sc,
            color,
            posn,
            surf.get_bitsize(),
            surf.get_flags(),
            surf.get_masks(),
        )
        self.assertEqual(sc, color, fail_msg)

    def check_not_at(self, surf, posn, color):
        sc = surf.get_at(posn)
        fail_msg = "%s != %s at %s, bitsize: %i, flags: %i, masks: %s" % (
            sc,
            color,
            posn,
            surf.get_bitsize(),
            surf.get_flags(),
            surf.get_masks(),
        )
        self.assertNotEqual(sc, color, fail_msg)

    @classmethod
    def setUpClass(cls):
        # Necessary for Surface.set_palette.
        pygame.init()
        pygame.display.set_mode((1, 1))

    @classmethod
    def tearDownClass(cls):
        pygame.quit()

    def setUp(self):
        # This makes sure pygame is always initialized before each test (in
        # case a test calls pygame.quit()).
        if not pygame.get_init():
            pygame.init()

        Surface = pygame.Surface
        size = self.default_size
        palette = self.default_palette
        if not self.is_started:
            # Create test surfaces
            self.surfaces = [
                Surface(size, 0, 8),
                Surface(size, SRCALPHA, 16),
                Surface(size, SRCALPHA, 32),
            ]
            self.surfaces[0].set_palette(palette)
            nonpalette_fmts = (
                # (8, (0xe0, 0x1c, 0x3, 0x0)),
                (12, (0xF00, 0xF0, 0xF, 0x0)),
                (15, (0x7C00, 0x3E0, 0x1F, 0x0)),
                (15, (0x1F, 0x3E0, 0x7C00, 0x0)),
                (16, (0xF00, 0xF0, 0xF, 0xF000)),
                (16, (0xF000, 0xF00, 0xF0, 0xF)),
                (16, (0xF, 0xF0, 0xF00, 0xF000)),
                (16, (0xF0, 0xF00, 0xF000, 0xF)),
                (16, (0x7C00, 0x3E0, 0x1F, 0x8000)),
                (16, (0xF800, 0x7C0, 0x3E, 0x1)),
                (16, (0x1F, 0x3E0, 0x7C00, 0x8000)),
                (16, (0x3E, 0x7C0, 0xF800, 0x1)),
                (16, (0xF800, 0x7E0, 0x1F, 0x0)),
                (16, (0x1F, 0x7E0, 0xF800, 0x0)),
                (24, (0xFF, 0xFF00, 0xFF0000, 0x0)),
                (24, (0xFF0000, 0xFF00, 0xFF, 0x0)),
                (32, (0xFF0000, 0xFF00, 0xFF, 0x0)),
                (32, (0xFF000000, 0xFF0000, 0xFF00, 0x0)),
                (32, (0xFF, 0xFF00, 0xFF0000, 0x0)),
                (32, (0xFF00, 0xFF0000, 0xFF000000, 0x0)),
                (32, (0xFF0000, 0xFF00, 0xFF, 0xFF000000)),
                (32, (0xFF000000, 0xFF0000, 0xFF00, 0xFF)),
                (32, (0xFF, 0xFF00, 0xFF0000, 0xFF000000)),
                (32, (0xFF00, 0xFF0000, 0xFF000000, 0xFF)),
            )
            for bitsize, masks in nonpalette_fmts:
                self.surfaces.append(Surface(size, 0, bitsize, masks))
        for surf in self.surfaces:
            surf.fill(self.background_color)

    def test_gfxdraw__subclassed_surface(self):
        """Ensure pygame.gfxdraw works on subclassed surfaces."""
        surface = SurfaceSubclass((11, 13), SRCALPHA, 32)
        surface.fill(pygame.Color("blue"))
        expected_color = pygame.Color("red")
        x, y = 1, 2

        pygame.gfxdraw.pixel(surface, x, y, expected_color)

        self.assertEqual(surface.get_at((x, y)), expected_color)

    def test_pixel(self):
        """pixel(surface, x, y, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.pixel(surf, 2, 2, fg)
            for x in range(1, 4):
                for y in range(1, 4):
                    if x == 2 and y == 2:
                        self.check_at(surf, (x, y), fg_adjusted)
                    else:
                        self.check_at(surf, (x, y), bg_adjusted)

    def test_hline(self):
        """hline(surface, x1, x2, y, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        startx = 10
        stopx = 80
        y = 50
        fg_test_points = [(startx, y), (stopx, y), ((stopx - startx) // 2, y)]
        bg_test_points = [
            (startx - 1, y),
            (stopx + 1, y),
            (startx, y - 1),
            (startx, y + 1),
            (stopx, y - 1),
            (stopx, y + 1),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.hline(surf, startx, stopx, y, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_vline(self):
        """vline(surface, x, y1, y2, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 50
        starty = 10
        stopy = 80
        fg_test_points = [(x, starty), (x, stopy), (x, (stopy - starty) // 2)]
        bg_test_points = [
            (x, starty - 1),
            (x, stopy + 1),
            (x - 1, starty),
            (x + 1, starty),
            (x - 1, stopy),
            (x + 1, stopy),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.vline(surf, x, starty, stopy, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_rectangle(self):
        """rectangle(surface, rect, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        rect = pygame.Rect(10, 15, 55, 62)
        rect_tuple = tuple(rect)
        fg_test_points = [
            rect.topleft,
            (rect.right - 1, rect.top),
            (rect.left, rect.bottom - 1),
            (rect.right - 1, rect.bottom - 1),
        ]
        bg_test_points = [
            (rect.left - 1, rect.top - 1),
            (rect.left + 1, rect.top + 1),
            (rect.right, rect.top - 1),
            (rect.right - 2, rect.top + 1),
            (rect.left - 1, rect.bottom),
            (rect.left + 1, rect.bottom - 2),
            (rect.right, rect.bottom),
            (rect.right - 2, rect.bottom - 2),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.rectangle(surf, rect, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)
            surf.fill(bg)
            pygame.gfxdraw.rectangle(surf, rect_tuple, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_box(self):
        """box(surface, rect, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        rect = pygame.Rect(10, 15, 55, 62)
        rect_tuple = tuple(rect)
        fg_test_points = [
            rect.topleft,
            (rect.left + 1, rect.top + 1),
            (rect.right - 1, rect.top),
            (rect.right - 2, rect.top + 1),
            (rect.left, rect.bottom - 1),
            (rect.left + 1, rect.bottom - 2),
            (rect.right - 1, rect.bottom - 1),
            (rect.right - 2, rect.bottom - 2),
        ]
        bg_test_points = [
            (rect.left - 1, rect.top - 1),
            (rect.right, rect.top - 1),
            (rect.left - 1, rect.bottom),
            (rect.right, rect.bottom),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.box(surf, rect, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)
            surf.fill(bg)
            pygame.gfxdraw.box(surf, rect_tuple, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_line(self):
        """line(surface, x1, y1, x2, y2, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x1 = 10
        y1 = 15
        x2 = 92
        y2 = 77
        fg_test_points = [(x1, y1), (x2, y2)]
        bg_test_points = [
            (x1 - 1, y1),
            (x1, y1 - 1),
            (x1 - 1, y1 - 1),
            (x2 + 1, y2),
            (x2, y2 + 1),
            (x2 + 1, y2 + 1),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.line(surf, x1, y1, x2, y2, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_circle(self):
        """circle(surface, x, y, r, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        r = 30
        fg_test_points = [(x, y - r), (x, y + r), (x - r, y), (x + r, y)]
        bg_test_points = [
            (x, y),
            (x, y - r + 1),
            (x, y - r - 1),
            (x, y + r + 1),
            (x, y + r - 1),
            (x - r - 1, y),
            (x - r + 1, y),
            (x + r + 1, y),
            (x + r - 1, y),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.circle(surf, x, y, r, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_arc(self):
        """arc(surface, x, y, r, start, end, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        r = 30
        start = 0  # +x direction, but not (x + r, y) (?)
        end = 90  # -y direction, including (x, y + r)
        fg_test_points = [(x, y + r), (x + r, y + 1)]
        bg_test_points = [
            (x, y),
            (x, y - r),
            (x - r, y),
            (x, y + r + 1),
            (x, y + r - 1),
            (x - 1, y + r),
            (x + r + 1, y),
            (x + r - 1, y),
            (x + r, y),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.arc(surf, x, y, r, start, end, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_aacircle(self):
        """aacircle(surface, x, y, r, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        r = 30
        fg_test_points = [(x, y - r), (x, y + r), (x - r, y), (x + r, y)]
        bg_test_points = [
            (x, y),
            (x, y - r + 1),
            (x, y - r - 1),
            (x, y + r + 1),
            (x, y + r - 1),
            (x - r - 1, y),
            (x - r + 1, y),
            (x + r + 1, y),
            (x + r - 1, y),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.aacircle(surf, x, y, r, fg)
            for posn in fg_test_points:
                self.check_not_at(surf, posn, bg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_filled_circle(self):
        """filled_circle(surface, x, y, r, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        r = 30
        fg_test_points = [
            (x, y - r),
            (x, y - r + 1),
            (x, y + r),
            (x, y + r - 1),
            (x - r, y),
            (x - r + 1, y),
            (x + r, y),
            (x + r - 1, y),
            (x, y),
        ]
        bg_test_points = [
            (x, y - r - 1),
            (x, y + r + 1),
            (x - r - 1, y),
            (x + r + 1, y),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.filled_circle(surf, x, y, r, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_ellipse(self):
        """ellipse(surface, x, y, rx, ry, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        rx = 30
        ry = 35
        fg_test_points = [(x, y - ry), (x, y + ry), (x - rx, y), (x + rx, y)]
        bg_test_points = [
            (x, y),
            (x, y - ry + 1),
            (x, y - ry - 1),
            (x, y + ry + 1),
            (x, y + ry - 1),
            (x - rx - 1, y),
            (x - rx + 1, y),
            (x + rx + 1, y),
            (x + rx - 1, y),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.ellipse(surf, x, y, rx, ry, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_aaellipse(self):
        """aaellipse(surface, x, y, rx, ry, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        rx = 30
        ry = 35
        fg_test_points = [(x, y - ry), (x, y + ry), (x - rx, y), (x + rx, y)]
        bg_test_points = [
            (x, y),
            (x, y - ry + 1),
            (x, y - ry - 1),
            (x, y + ry + 1),
            (x, y + ry - 1),
            (x - rx - 1, y),
            (x - rx + 1, y),
            (x + rx + 1, y),
            (x + rx - 1, y),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.aaellipse(surf, x, y, rx, ry, fg)
            for posn in fg_test_points:
                self.check_not_at(surf, posn, bg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_filled_ellipse(self):
        """filled_ellipse(surface, x, y, rx, ry, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        rx = 30
        ry = 35
        fg_test_points = [
            (x, y - ry),
            (x, y - ry + 1),
            (x, y + ry),
            (x, y + ry - 1),
            (x - rx, y),
            (x - rx + 1, y),
            (x + rx, y),
            (x + rx - 1, y),
            (x, y),
        ]
        bg_test_points = [
            (x, y - ry - 1),
            (x, y + ry + 1),
            (x - rx - 1, y),
            (x + rx + 1, y),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.filled_ellipse(surf, x, y, rx, ry, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_pie(self):
        """pie(surface, x, y, r, start, end, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x = 45
        y = 40
        r = 30
        start = 0  # +x direction, including (x + r, y)
        end = 90  # -y direction, but not (x, y + r) (?)
        fg_test_points = [(x, y), (x + 1, y), (x, y + 1), (x + r, y)]
        bg_test_points = [
            (x - 1, y),
            (x, y - 1),
            (x - 1, y - 1),
            (x + 1, y + 1),
            (x + r + 1, y),
            (x + r, y - 1),
            (x, y + r + 1),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.pie(surf, x, y, r, start, end, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_trigon(self):
        """trigon(surface, x1, y1, x2, y2, x3, y3, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x1 = 10
        y1 = 15
        x2 = 92
        y2 = 77
        x3 = 20
        y3 = 60
        fg_test_points = [(x1, y1), (x2, y2), (x3, y3)]
        bg_test_points = [
            (x1 - 1, y1 - 1),
            (x2 + 1, y2 + 1),
            (x3 - 1, y3 + 1),
            (x1 + 10, y1 + 30),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.trigon(surf, x1, y1, x2, y2, x3, y3, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_aatrigon(self):
        """aatrigon(surface, x1, y1, x2, y2, x3, y3, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x1 = 10
        y1 = 15
        x2 = 92
        y2 = 77
        x3 = 20
        y3 = 60
        fg_test_points = [(x1, y1), (x2, y2), (x3, y3)]
        bg_test_points = [
            (x1 - 1, y1 - 1),
            (x2 + 1, y2 + 1),
            (x3 - 1, y3 + 1),
            (x1 + 10, y1 + 30),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.aatrigon(surf, x1, y1, x2, y2, x3, y3, fg)
            for posn in fg_test_points:
                self.check_not_at(surf, posn, bg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_aatrigon__with_horizontal_edge(self):
        """Ensure aatrigon draws horizontal edges correctly.

        This test creates 2 surfaces and draws an aatrigon on each. The pixels
        on each surface are compared to ensure they are the same. The only
        difference between the 2 aatrigons is the order the points are drawn.
        The order of the points should have no impact on the final drawing.

        Related to pygame-ce issue #506.
        """
        bg_color = pygame.Color("white")
        line_color = pygame.Color("black")
        width, height = 11, 10
        expected_surface = pygame.Surface((width, height), 0, 32)
        expected_surface.fill(bg_color)
        surface = pygame.Surface((width, height), 0, 32)
        surface.fill(bg_color)

        x1, y1 = width - 1, 0
        x2, y2 = (width - 1) // 2, height - 1
        x3, y3 = 0, 0

        # The points in this order draw as expected.
        pygame.gfxdraw.aatrigon(expected_surface, x1, y1, x2, y2, x3, y3, line_color)

        # The points in reverse order fail to draw the horizontal edge along
        # the top.
        pygame.gfxdraw.aatrigon(surface, x3, y3, x2, y2, x1, y1, line_color)

        # The surfaces are locked for a possible speed up of pixel access.
        expected_surface.lock()
        surface.lock()
        for x in range(width):
            for y in range(height):
                self.assertEqual(
                    expected_surface.get_at((x, y)),
                    surface.get_at((x, y)),
                    f"pos=({x}, {y})",
                )

        surface.unlock()
        expected_surface.unlock()

    def test_filled_trigon(self):
        """filled_trigon(surface, x1, y1, x2, y2, x3, y3, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        x1 = 10
        y1 = 15
        x2 = 92
        y2 = 77
        x3 = 20
        y3 = 60
        fg_test_points = [(x1, y1), (x2, y2), (x3, y3), (x1 + 10, y1 + 30)]
        bg_test_points = [(x1 - 1, y1 - 1), (x2 + 1, y2 + 1), (x3 - 1, y3 + 1)]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.filled_trigon(surf, x1, y1, x2, y2, x3, y3, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_polygon(self):
        """polygon(surface, points, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        points = [(10, 80), (10, 15), (92, 25), (92, 80)]
        fg_test_points = points + [
            (points[0][0], points[0][1] - 1),
            (points[0][0] + 1, points[0][1]),
            (points[3][0] - 1, points[3][1]),
            (points[3][0], points[3][1] - 1),
            (points[2][0], points[2][1] + 1),
        ]
        bg_test_points = [
            (points[0][0] - 1, points[0][1]),
            (points[0][0], points[0][1] + 1),
            (points[0][0] - 1, points[0][1] + 1),
            (points[0][0] + 1, points[0][1] - 1),
            (points[3][0] + 1, points[3][1]),
            (points[3][0], points[3][1] + 1),
            (points[3][0] + 1, points[3][1] + 1),
            (points[3][0] - 1, points[3][1] - 1),
            (points[2][0] + 1, points[2][1]),
            (points[2][0] - 1, points[2][1] + 1),
            (points[1][0] - 1, points[1][1]),
            (points[1][0], points[1][1] - 1),
            (points[1][0] - 1, points[1][1] - 1),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.polygon(surf, points, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_aapolygon(self):
        """aapolygon(surface, points, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        points = [(10, 80), (10, 15), (92, 25), (92, 80)]
        fg_test_points = points
        bg_test_points = [
            (points[0][0] - 1, points[0][1]),
            (points[0][0], points[0][1] + 1),
            (points[0][0] - 1, points[0][1] + 1),
            (points[0][0] + 1, points[0][1] - 1),
            (points[3][0] + 1, points[3][1]),
            (points[3][0], points[3][1] + 1),
            (points[3][0] + 1, points[3][1] + 1),
            (points[3][0] - 1, points[3][1] - 1),
            (points[2][0] + 1, points[2][1]),
            (points[2][0] - 1, points[2][1] + 1),
            (points[1][0] - 1, points[1][1]),
            (points[1][0], points[1][1] - 1),
            (points[1][0] - 1, points[1][1] - 1),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.aapolygon(surf, points, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_not_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_aapolygon__with_horizontal_edge(self):
        """Ensure aapolygon draws horizontal edges correctly.

        This test creates 2 surfaces and draws a polygon on each. The pixels
        on each surface are compared to ensure they are the same. The only
        difference between the 2 polygons is that one is drawn using
        aapolygon() and the other using multiple line() calls. They should
        produce the same final drawing.

        Related to pygame-ce issue #506.
        """
        bg_color = pygame.Color("white")
        line_color = pygame.Color("black")
        width, height = 11, 10
        expected_surface = pygame.Surface((width, height), 0, 32)
        expected_surface.fill(bg_color)
        surface = pygame.Surface((width, height), 0, 32)
        surface.fill(bg_color)

        points = ((0, 0), (0, height - 1), (width - 1, height - 1), (width - 1, 0))

        # The points are used to draw the expected aapolygon using the line()
        # function.
        for (x1, y1), (x2, y2) in zip(points, points[1:] + points[:1]):
            pygame.gfxdraw.line(expected_surface, x1, y1, x2, y2, line_color)

        # The points in this order fail to draw the horizontal edge along
        # the top.
        pygame.gfxdraw.aapolygon(surface, points, line_color)

        # The surfaces are locked for a possible speed up of pixel access.
        expected_surface.lock()
        surface.lock()
        for x in range(width):
            for y in range(height):
                self.assertEqual(
                    expected_surface.get_at((x, y)),
                    surface.get_at((x, y)),
                    f"pos=({x}, {y})",
                )

        surface.unlock()
        expected_surface.unlock()

    def test_filled_polygon(self):
        """filled_polygon(surface, points, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        points = [(10, 80), (10, 15), (92, 25), (92, 80)]
        fg_test_points = points + [
            (points[0][0], points[0][1] - 1),
            (points[0][0] + 1, points[0][1]),
            (points[0][0] + 1, points[0][1] - 1),
            (points[3][0] - 1, points[3][1]),
            (points[3][0], points[3][1] - 1),
            (points[3][0] - 1, points[3][1] - 1),
            (points[2][0], points[2][1] + 1),
            (points[2][0] - 1, points[2][1] + 1),
        ]
        bg_test_points = [
            (points[0][0] - 1, points[0][1]),
            (points[0][0], points[0][1] + 1),
            (points[0][0] - 1, points[0][1] + 1),
            (points[3][0] + 1, points[3][1]),
            (points[3][0], points[3][1] + 1),
            (points[3][0] + 1, points[3][1] + 1),
            (points[2][0] + 1, points[2][1]),
            (points[1][0] - 1, points[1][1]),
            (points[1][0], points[1][1] - 1),
            (points[1][0] - 1, points[1][1] - 1),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.filled_polygon(surf, points, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

    def test_textured_polygon(self):
        """textured_polygon(surface, points, texture, tx, ty): return None"""
        w, h = self.default_size
        fg = self.foreground_color
        bg = self.background_color
        tx = 0
        ty = 0
        texture = pygame.Surface((w + tx, h + ty), 0, 24)
        texture.fill(fg, (0, 0, w, h))
        points = [(10, 80), (10, 15), (92, 25), (92, 80)]
        # Don't know how to really check this as boarder points may
        # or may not be included in the textured polygon.
        fg_test_points = [(points[1][0] + 30, points[1][1] + 40)]
        bg_test_points = [
            (points[0][0] - 1, points[0][1]),
            (points[0][0], points[0][1] + 1),
            (points[0][0] - 1, points[0][1] + 1),
            (points[3][0] + 1, points[3][1]),
            (points[3][0], points[3][1] + 1),
            (points[3][0] + 1, points[3][1] + 1),
            (points[2][0] + 1, points[2][1]),
            (points[1][0] - 1, points[1][1]),
            (points[1][0], points[1][1] - 1),
            (points[1][0] - 1, points[1][1] - 1),
        ]
        for surf in self.surfaces[1:]:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.textured_polygon(surf, points, texture, -tx, -ty)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)

        # Alpha blit to 8 bits-per-pixel surface forbidden.
        texture = pygame.Surface(self.default_size, SRCALPHA, 32)
        self.assertRaises(
            ValueError,
            pygame.gfxdraw.textured_polygon,
            self.surfaces[0],
            points,
            texture,
            0,
            0,
        )

    def test_bezier(self):
        """bezier(surface, points, steps, color): return None"""
        fg = self.foreground_color
        bg = self.background_color
        points = [(10, 50), (25, 15), (60, 80), (92, 30)]
        fg_test_points = [points[0], points[3]]
        bg_test_points = [
            (points[0][0] - 1, points[0][1]),
            (points[3][0] + 1, points[3][1]),
            (points[1][0], points[1][1] + 3),
            (points[2][0], points[2][1] - 3),
        ]
        for surf in self.surfaces:
            fg_adjusted = surf.unmap_rgb(surf.map_rgb(fg))
            bg_adjusted = surf.unmap_rgb(surf.map_rgb(bg))
            pygame.gfxdraw.bezier(surf, points, 30, fg)
            for posn in fg_test_points:
                self.check_at(surf, posn, fg_adjusted)
            for posn in bg_test_points:
                self.check_at(surf, posn, bg_adjusted)


if __name__ == "__main__":
    unittest.main()