surface_test.py 文件源码

def test_fill_blend_rgba(self):
        destinations = [self._make_surface(8),
                        self._make_surface(16),
                        self._make_surface(16, srcalpha=True),
                        self._make_surface(24),
                        self._make_surface(32),
                        self._make_surface(32, srcalpha=True)]
        blend = [('BLEND_RGBA_ADD', (0, 25, 100, 255),
                  lambda a, b: min(a + b, 255)),
                 ('BLEND_RGBA_SUB', (0, 25, 100, 255),
                  lambda a, b: max(a - b, 0)),
                 ('BLEND_RGBA_MULT', (0, 7, 100, 255),
                  lambda a, b: (a * b) // 256),
                 ('BLEND_RGBA_MIN', (0, 255, 0, 255), min),
                 ('BLEND_RGBA_MAX', (0, 255, 0, 255), max)]

        for dst in destinations:
            dst_palette = [dst.unmap_rgb(dst.map_rgb(c))
                           for c in self._test_palette]
            for blend_name, fill_color, op in blend:
                fc = dst.unmap_rgb(dst.map_rgb(fill_color))
                self._fill_surface(dst)
                p = []
                for dc in dst_palette:
                    c = [op(dc[i], fc[i]) for i in range(4)]
                    if not dst.get_masks()[3]:
                        c[3] = 255
                    c = dst.unmap_rgb(dst.map_rgb(c))
                    p.append(c)
                dst.fill(fill_color, special_flags=getattr(pygame, blend_name))
                self._assert_surface(dst, p, ", %s" % blend_name)