author | Tero Marttila <terom@paivola.fi> |
Mon, 15 Sep 2014 00:49:15 +0300 | |
changeset 144 | 5b2b866ad0a3 |
parent 140 | a3bbecbd31e7 |
child 165 | 1dc09e81a4e2 |
permissions | -rw-r--r-- |
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pngtile.tile: separate Application dedicated to PNG serving
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""" |
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pngtile.tile: separate Application dedicated to PNG serving
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Raw tile handling. |
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pngtile.tile: separate Application dedicated to PNG serving
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""" |
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from pngtile.application import BaseApplication |
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from werkzeug import Request, Response, exceptions |
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|
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import pypngtile |
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|
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## Coordinates |
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# width of a tile |
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TILE_SIZE = 256 |
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|
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# maximum zoom out |
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MAX_ZOOM = 4 |
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|
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# max. output resolution to allow |
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MAX_PIXELS = 1920 * 1200 |
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|
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def scale (val, zoom): |
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""" |
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Scale dimension by zoom factor |
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|
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zl > 0 -> bigger |
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zl < 0 -> smaller |
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""" |
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|
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if zoom > 0: |
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return val << zoom |
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|
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elif zoom < 0: |
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return val >> -zoom |
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|
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else: |
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return val |
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def scale_center (val, dim, zoom): |
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""" |
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Scale value about center by zoom. |
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""" |
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return scale(val, zoom) - dim / 2 |
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class TileApplication (BaseApplication): |
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def __init__ (self, **opts): |
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BaseApplication.__init__(self, **opts) |
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def render_region (self, request, image): |
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""" |
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Handle request for an image region |
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""" |
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|
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width = int(request.args['w']) |
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height = int(request.args['h']) |
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x = int(request.args['x']) |
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y = int(request.args['y']) |
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zoom = int(request.args.get('zoom', "0")) |
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# safety limit |
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if width * height > MAX_PIXELS: |
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raise exceptions.BadRequest("Image size: %d * %d > %d" % (width, height, MAX_PIXELS)) |
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if zoom > MAX_ZOOM: |
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raise exceptions.BadRequest("Image zoom: %d > %d" % (zoom, MAX_ZOOM)) |
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x = scale_center(x, width, zoom) |
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y = scale_center(y, height, zoom) |
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|
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try: |
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return image.tile_mem(width, height, x, y, zoom) |
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|
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except pypngtile.Error as error: |
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raise exceptions.BadRequest(str(error)) |
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def render_tile (self, request, image): |
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""" |
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Handle request for image tile |
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""" |
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width = TILE_SIZE |
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height = TILE_SIZE |
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x = int(request.args['x']) |
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y = int(request.args['y']) |
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zoom = int(request.args.get('zoom', "0")) |
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if zoom > MAX_ZOOM: |
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raise exceptions.BadRequest("Image zoom: %d > %d" % (zoom, MAX_ZOOM)) |
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x = scale(x * width, zoom) |
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y = scale(y * height, zoom) |
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|
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try: |
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return image.tile_mem(width, height, x, y, zoom) |
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|
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except pypngtile.Error as error: |
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raise exceptions.BadRequest(str(error)) |
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|
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def handle (self, request): |
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""" |
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Handle request for an image |
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""" |
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|
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try: |
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image, name = self.get_image(request.path) |
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except pypngtile.Error as error: |
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106 |
raise exceptions.BadRequest(str(error)) |
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|
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if 'w' in request.args and 'h' in request.args and 'x' in request.args and 'y' in request.args: |
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png = self.render_region(request, image) |
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|
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elif 'x' in request.args and 'y' in request.args: |
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png = self.render_tile(request, image) |
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|
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else: |
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raise exceptions.BadRequest("Unknown args") |
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|
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return Response(png, content_type='image/png') |