238 lines
8.2 KiB
Python
238 lines
8.2 KiB
Python
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# -*- coding: utf-8 -*-
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# Copyright (c) 2016 Richard Hull and contributors
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# See LICENSE.rst for details.
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import os
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import sys
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import atexit
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import logging
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from PIL import Image
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from oled.device import device
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from oled.serial import noop
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logger = logging.getLogger(__name__)
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class emulator(device):
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"""
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Base class for emulated OLED driver classes
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"""
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def __init__(self, width, height, rotate, mode, transform, scale):
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super(emulator, self).__init__(serial_interface=noop())
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try:
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import pygame
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except:
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raise RuntimeError("Emulator requires pygame to be installed")
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self._pygame = pygame
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self.capabilities(width, height, rotate, mode)
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self.scale = 1 if transform == "none" else scale
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self._transform = getattr(transformer(pygame, width, height, scale),
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"none" if scale == 1 else transform)
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def cleanup(self):
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pass
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def to_surface(self, image):
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"""
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Converts a :py:mod:`PIL.Image` into a :class:`pygame.Surface`,
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transforming it according to the ``transform`` and ``scale``
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constructor arguments.
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"""
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im = image.convert("RGB")
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mode = im.mode
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size = im.size
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data = im.tobytes()
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del im
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surface = self._pygame.image.fromstring(data, size, mode)
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return self._transform(surface)
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class capture(emulator):
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"""
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Pseudo-device that acts like an OLED display, except that it writes
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the image to a numbered PNG file when the :func:`display` method
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is called.
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While the capability of an OLED device is monochrome, there is no
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limitation here, and hence supports 24-bit color depth.
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"""
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def __init__(self, width=128, height=64, rotate=0, mode="RGB",
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transform="scale2x", scale=2, file_template="oled_{0:06}.png",
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**kwargs):
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super(capture, self).__init__(width, height, rotate, mode, transform, scale)
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self._count = 0
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self._file_template = file_template
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def display(self, image):
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"""
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Takes a :py:mod:`PIL.Image` and dumps it to a numbered PNG file.
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"""
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assert(image.size == self.size)
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self._count += 1
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filename = self._file_template.format(self._count)
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image = self.preprocess(image)
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surface = self.to_surface(image)
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logger.debug("Writing: {0}".format(filename))
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self._pygame.image.save(surface, filename)
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class gifanim(emulator):
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"""
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Pseudo-device that acts like an OLED display, except that it collects
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the images when the :func:`display` method is called, and on exit,
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assembles them into an animated GIF image.
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While the capability of an OLED device is monochrome, there is no
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limitation here, and hence supports 24-bit color depth, albeit with
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an indexed color palette.
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"""
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def __init__(self, width=128, height=64, rotate=0, mode="RGB",
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transform="scale2x", scale=2, filename="oled_anim.gif",
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duration=0.01, loop=0, max_frames=None, **kwargs):
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super(gifanim, self).__init__(width, height, rotate, mode, transform, scale)
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self._images = []
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self._count = 0
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self._max_frames = max_frames
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self._filename = filename
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self._loop = loop
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self._duration = duration
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atexit.register(self.write_animation)
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def display(self, image):
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"""
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Takes an image, scales it according to the nominated transform, and
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stores it for later building into an animated GIF.
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"""
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assert(image.size == self.size)
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image = self.preprocess(image)
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surface = self.to_surface(image)
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rawbytes = self._pygame.image.tostring(surface, "RGB", False)
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im = Image.frombytes("RGB", (self._w * self.scale, self._h * self.scale), rawbytes)
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self._images.append(im)
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self._count += 1
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logger.debug("Recording frame: {0}".format(self._count))
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if self._max_frames and self._count >= self._max_frames:
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sys.exit(0)
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def write_animation(self):
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logger.debug("Please wait... building animated GIF")
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with open(self._filename, "w+b") as fp:
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self._images[0].save(fp, save_all=True, loop=self._loop,
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duration=int(self._duration * 1000),
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append_images=self._images[1:],
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format="GIF")
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logger.debug("Wrote {0} frames to file: {1} ({2} bytes)".format(
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len(self._images), self._filename, os.stat(self._filename).st_size))
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class pygame(emulator):
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"""
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Pseudo-device that acts like an OLED display, except that it renders
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to an displayed window. The frame rate is limited to 60FPS (much faster
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than a Raspberry Pi can acheive, but this can be overridden as necessary).
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While the capability of an OLED device is monochrome, there is no
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limitation here, and hence supports 24-bit color depth.
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:mod:`pygame` is used to render the emulated display window, and it's
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event loop is checked to see if the ESC key was pressed or the window
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was dismissed: if so :func:`sys.exit()` is called.
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"""
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def __init__(self, width=128, height=64, rotate=0, mode="RGB", transform="scale2x",
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scale=2, frame_rate=60, **kwargs):
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super(pygame, self).__init__(width, height, rotate, mode, transform, scale)
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self._pygame.init()
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self._pygame.font.init()
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self._pygame.display.set_caption("OLED Emulator")
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self._clock = self._pygame.time.Clock()
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self._fps = frame_rate
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self._screen = self._pygame.display.set_mode((width * self.scale, height * self.scale))
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self._screen.fill((0, 0, 0))
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self._pygame.display.flip()
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def _abort(self):
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keystate = self._pygame.key.get_pressed()
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return keystate[self._pygame.K_ESCAPE] or self._pygame.event.peek(self._pygame.QUIT)
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def display(self, image):
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"""
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Takes a :py:mod:`PIL.Image` and renders it to a pygame display surface.
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"""
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assert(image.size == self.size)
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image = self.preprocess(image)
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self._clock.tick(self._fps)
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self._pygame.event.pump()
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if self._abort():
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self._pygame.quit()
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sys.exit()
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surface = self.to_surface(image)
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self._screen.blit(surface, (0, 0))
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self._pygame.display.flip()
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class dummy(emulator):
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"""
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Pseudo-device that acts like an OLED display, except that it does nothing
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other than retain a copy of the displayed image. It is mostly useful for
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testing. While the capability of an OLED device is monochrome, there is no
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limitation here, and hence supports 24-bit color depth.
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"""
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def __init__(self, width=128, height=64, rotate=0, mode="RGB", transform="scale2x",
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scale=2, **kwargs):
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super(dummy, self).__init__(width, height, rotate, mode, transform, scale)
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self.image = None
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def display(self, image):
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"""
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Takes a :py:mod:`PIL.Image` and makes a copy of it for later
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use/inspection.
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"""
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assert(image.size == self.size)
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self.image = self.preprocess(image).copy()
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class transformer(object):
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"""
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Helper class used to dispatch transformation operations.
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"""
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def __init__(self, pygame, width, height, scale):
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self._pygame = pygame
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self._output_size = (width * scale, height * scale)
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self.scale = scale
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def none(self, surface):
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"""
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No-op transform - used when ``scale`` = 1
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"""
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return surface
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def scale2x(self, surface):
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"""
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Scales using the AdvanceMAME Scale2X algorithm which does a
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'jaggie-less' scale of bitmap graphics.
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"""
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assert(self.scale == 2)
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return self._pygame.transform.scale2x(surface)
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def smoothscale(self, surface):
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"""
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Smooth scaling using MMX or SSE extensions if available
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"""
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return self._pygame.transform.smoothscale(surface, self._output_size)
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def identity(self, surface):
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"""
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Fast scale operation that does not sample the results
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"""
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return self._pygame.transform.scale(surface, self._output_size)
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