author | Lennard de Rijk <ljvderijk@gmail.com> |
Fri, 23 Jan 2009 11:36:55 +0000 | |
changeset 916 | f18c0a56da8b |
parent 686 | df109be0567c |
child 1278 | a7766286a7be |
permissions | -rwxr-xr-x |
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#!/usr/bin/env python |
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# |
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# Copyright 2007 Google Inc. |
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# |
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# Licensed under the Apache License, Version 2.0 (the "License"); |
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# you may not use this file except in compliance with the License. |
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# You may obtain a copy of the License at |
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# |
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# http://www.apache.org/licenses/LICENSE-2.0 |
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# |
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# Unless required by applicable law or agreed to in writing, software |
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# distributed under the License is distributed on an "AS IS" BASIS, |
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
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# See the License for the specific language governing permissions and |
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# limitations under the License. |
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# |
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"""Stub version of the images API.""" |
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import logging |
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import StringIO |
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import PIL |
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from PIL import _imaging |
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from PIL import Image |
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from google.appengine.api import apiproxy_stub |
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from google.appengine.api import images |
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from google.appengine.api.images import images_service_pb |
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from google.appengine.runtime import apiproxy_errors |
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class ImagesServiceStub(apiproxy_stub.APIProxyStub): |
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"""Stub version of images API to be used with the dev_appserver.""" |
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def __init__(self, service_name='images'): |
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"""Preloads PIL to load all modules in the unhardened environment. |
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Args: |
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service_name: Service name expected for all calls. |
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""" |
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super(ImagesServiceStub, self).__init__(service_name) |
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Image.init() |
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def _Dynamic_Transform(self, request, response): |
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"""Trivial implementation of ImagesService::Transform. |
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Based off documentation of the PIL library at |
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http://www.pythonware.com/library/pil/handbook/index.htm |
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Args: |
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request: ImagesTransformRequest, contains image request info. |
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response: ImagesTransformResponse, contains transformed image. |
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""" |
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image = request.image().content() |
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if not image: |
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raise apiproxy_errors.ApplicationError( |
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images_service_pb.ImagesServiceError.NOT_IMAGE) |
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image = StringIO.StringIO(image) |
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try: |
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original_image = Image.open(image) |
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except IOError: |
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raise apiproxy_errors.ApplicationError( |
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images_service_pb.ImagesServiceError.BAD_IMAGE_DATA) |
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img_format = original_image.format |
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if img_format not in ("BMP", "GIF", "ICO", "JPEG", "PNG", "TIFF"): |
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raise apiproxy_errors.ApplicationError( |
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images_service_pb.ImagesServiceError.NOT_IMAGE) |
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|
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new_image = self._ProcessTransforms(original_image, |
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request.transform_list()) |
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response_value = self._EncodeImage(new_image, request.output()) |
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response.mutable_image().set_content(response_value) |
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def _EncodeImage(self, image, output_encoding): |
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"""Encode the given image and return it in string form. |
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|
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Args: |
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image: PIL Image object, image to encode. |
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output_encoding: ImagesTransformRequest.OutputSettings object. |
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|
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Returns: |
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str with encoded image information in given encoding format. |
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""" |
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image_string = StringIO.StringIO() |
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image_encoding = "PNG" |
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if (output_encoding.mime_type() == images_service_pb.OutputSettings.JPEG): |
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image_encoding = "JPEG" |
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image = image.convert("RGB") |
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image.save(image_string, image_encoding) |
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return image_string.getvalue() |
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def _ValidateCropArg(self, arg): |
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"""Check an argument for the Crop transform. |
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Args: |
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arg: float, argument to Crop transform to check. |
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Raises: |
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apiproxy_errors.ApplicationError on problem with argument. |
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""" |
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if not isinstance(arg, float): |
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raise apiproxy_errors.ApplicationError( |
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114 |
images_service_pb.ImagesServiceError.BAD_TRANSFORM_DATA) |
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|
115 |
|
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|
116 |
if not (0 <= arg <= 1.0): |
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117 |
raise apiproxy_errors.ApplicationError( |
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118 |
images_service_pb.ImagesServiceError.BAD_TRANSFORM_DATA) |
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119 |
|
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120 |
def _CalculateNewDimensions(self, |
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121 |
current_width, |
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122 |
current_height, |
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123 |
req_width, |
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124 |
req_height): |
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125 |
"""Get new resize dimensions keeping the current aspect ratio. |
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126 |
|
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127 |
This uses the more restricting of the two requested values to determine |
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128 |
the new ratio. |
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129 |
|
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130 |
Args: |
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131 |
current_width: int, current width of the image. |
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132 |
current_height: int, current height of the image. |
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133 |
req_width: int, requested new width of the image. |
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134 |
req_height: int, requested new height of the image. |
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135 |
|
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|
136 |
Returns: |
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137 |
tuple (width, height) which are both ints of the new ratio. |
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|
138 |
""" |
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|
139 |
|
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140 |
width_ratio = float(req_width) / current_width |
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141 |
height_ratio = float(req_height) / current_height |
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142 |
|
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143 |
if req_width == 0 or (width_ratio > height_ratio and req_height != 0): |
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144 |
return int(height_ratio * current_width), req_height |
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145 |
else: |
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146 |
return req_width, int(width_ratio * current_height) |
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147 |
|
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148 |
def _Resize(self, image, transform): |
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"""Use PIL to resize the given image with the given transform. |
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150 |
|
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151 |
Args: |
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152 |
image: PIL.Image.Image object to resize. |
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153 |
transform: images_service_pb.Transform to use when resizing. |
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|
154 |
|
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155 |
Returns: |
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156 |
PIL.Image.Image with transforms performed on it. |
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|
157 |
|
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|
158 |
Raises: |
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159 |
BadRequestError if the resize data given is bad. |
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160 |
""" |
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161 |
width = 0 |
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162 |
height = 0 |
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|
163 |
|
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|
164 |
if transform.has_width(): |
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165 |
width = transform.width() |
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|
166 |
if width < 0 or 4000 < width: |
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|
167 |
raise apiproxy_errors.ApplicationError( |
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|
168 |
images_service_pb.ImagesServiceError.BAD_TRANSFORM_DATA) |
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|
169 |
|
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|
170 |
if transform.has_height(): |
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|
171 |
height = transform.height() |
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|
172 |
if height < 0 or 4000 < height: |
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|
173 |
raise apiproxy_errors.ApplicationError( |
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|
174 |
images_service_pb.ImagesServiceError.BAD_TRANSFORM_DATA) |
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|
175 |
|
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|
176 |
current_width, current_height = image.size |
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|
177 |
new_width, new_height = self._CalculateNewDimensions(current_width, |
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|
178 |
current_height, |
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|
179 |
width, |
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|
180 |
height) |
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|
181 |
|
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|
182 |
return image.resize((new_width, new_height), Image.ANTIALIAS) |
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|
183 |
|
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|
184 |
def _Rotate(self, image, transform): |
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|
185 |
"""Use PIL to rotate the given image with the given transform. |
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|
186 |
|
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changeset
|
187 |
Args: |
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|
188 |
image: PIL.Image.Image object to rotate. |
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|
189 |
transform: images_service_pb.Transform to use when rotating. |
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changeset
|
190 |
|
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diff
changeset
|
191 |
Returns: |
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parents:
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changeset
|
192 |
PIL.Image.Image with transforms performed on it. |
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changeset
|
193 |
|
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changeset
|
194 |
Raises: |
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|
195 |
BadRequestError if the rotate data given is bad. |
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|
196 |
""" |
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|
197 |
degrees = transform.rotate() |
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|
198 |
if degrees < 0 or degrees % 90 != 0: |
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|
199 |
raise apiproxy_errors.ApplicationError( |
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|
200 |
images_service_pb.ImagesServiceError.BAD_TRANSFORM_DATA) |
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|
201 |
degrees %= 360 |
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changeset
|
202 |
|
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changeset
|
203 |
degrees = 360 - degrees |
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|
204 |
return image.rotate(degrees) |
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changeset
|
205 |
|
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|
206 |
def _Crop(self, image, transform): |
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|
207 |
"""Use PIL to crop the given image with the given transform. |
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changeset
|
208 |
|
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|
209 |
Args: |
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|
210 |
image: PIL.Image.Image object to crop. |
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parents:
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changeset
|
211 |
transform: images_service_pb.Transform to use when cropping. |
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changeset
|
212 |
|
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changeset
|
213 |
Returns: |
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parents:
diff
changeset
|
214 |
PIL.Image.Image with transforms performed on it. |
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
215 |
|
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Todd Larsen <tlarsen@google.com>
parents:
diff
changeset
|
216 |
Raises: |
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|
217 |
BadRequestError if the crop data given is bad. |
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|
218 |
""" |
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|
219 |
left_x = 0.0 |
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|
220 |
top_y = 0.0 |
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|
221 |
right_x = 1.0 |
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|
222 |
bottom_y = 1.0 |
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changeset
|
223 |
|
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|
224 |
if transform.has_crop_left_x(): |
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|
225 |
left_x = transform.crop_left_x() |
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|
226 |
self._ValidateCropArg(left_x) |
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|
227 |
|
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changeset
|
228 |
if transform.has_crop_top_y(): |
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top_y = transform.crop_top_y() |
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self._ValidateCropArg(top_y) |
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|
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if transform.has_crop_right_x(): |
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right_x = transform.crop_right_x() |
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self._ValidateCropArg(right_x) |
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|
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if transform.has_crop_bottom_y(): |
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bottom_y = transform.crop_bottom_y() |
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self._ValidateCropArg(bottom_y) |
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|
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width, height = image.size |
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|
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box = (int(transform.crop_left_x() * width), |
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int(transform.crop_top_y() * height), |
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int(transform.crop_right_x() * width), |
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int(transform.crop_bottom_y() * height)) |
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|
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return image.crop(box) |
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|
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def _CheckTransformCount(self, transform_map, req_transform): |
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"""Check that the requested transform hasn't already been set in map. |
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|
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Args: |
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transform_map: {images_service_pb.ImagesServiceTransform: boolean}, map |
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to use to determine if the requested transform has been called. |
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req_transform: images_service_pb.ImagesServiceTransform, the requested |
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transform. |
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|
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Raises: |
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BadRequestError if we are passed more than one of the same type of |
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transform. |
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""" |
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if req_transform in transform_map: |
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raise apiproxy_errors.ApplicationError( |
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images_service_pb.ImagesServiceError.BAD_TRANSFORM_DATA) |
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transform_map[req_transform] = True |
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|
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def _ProcessTransforms(self, image, transforms): |
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"""Execute PIL operations based on transform values. |
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269 |
|
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270 |
Args: |
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image: PIL.Image.Image instance, image to manipulate. |
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trasnforms: list of ImagesTransformRequest.Transform objects. |
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273 |
|
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274 |
Returns: |
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PIL.Image.Image with transforms performed on it. |
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276 |
|
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277 |
Raises: |
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278 |
BadRequestError if we are passed more than one of the same type of |
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279 |
transform. |
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280 |
""" |
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281 |
new_image = image |
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282 |
transform_map = {} |
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283 |
for transform in transforms: |
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284 |
if transform.has_width() or transform.has_height(): |
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285 |
self._CheckTransformCount( |
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286 |
transform_map, |
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287 |
images_service_pb.ImagesServiceTransform.RESIZE |
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|
288 |
) |
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|
289 |
|
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290 |
new_image = self._Resize(new_image, transform) |
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291 |
|
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292 |
elif transform.has_rotate(): |
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293 |
self._CheckTransformCount( |
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|
294 |
transform_map, |
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295 |
images_service_pb.ImagesServiceTransform.ROTATE |
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|
296 |
) |
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|
297 |
|
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298 |
new_image = self._Rotate(new_image, transform) |
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299 |
|
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300 |
elif transform.has_horizontal_flip(): |
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301 |
self._CheckTransformCount( |
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|
302 |
transform_map, |
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303 |
images_service_pb.ImagesServiceTransform.HORIZONTAL_FLIP |
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|
304 |
) |
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|
305 |
|
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|
306 |
new_image = new_image.transpose(Image.FLIP_LEFT_RIGHT) |
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|
307 |
|
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|
308 |
elif transform.has_vertical_flip(): |
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|
309 |
self._CheckTransformCount( |
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|
310 |
transform_map, |
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|
311 |
images_service_pb.ImagesServiceTransform.VERTICAL_FLIP |
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|
312 |
) |
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|
313 |
|
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|
314 |
new_image = new_image.transpose(Image.FLIP_TOP_BOTTOM) |
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|
315 |
|
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|
316 |
elif (transform.has_crop_left_x() or |
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|
317 |
transform.has_crop_top_y() or |
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|
318 |
transform.has_crop_right_x() or |
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|
319 |
transform.has_crop_bottom_y()): |
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|
320 |
self._CheckTransformCount( |
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|
321 |
transform_map, |
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|
322 |
images_service_pb.ImagesServiceTransform.CROP |
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|
323 |
) |
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|
324 |
|
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|
325 |
new_image = self._Crop(new_image, transform) |
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|
326 |
|
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|
327 |
elif transform.has_autolevels(): |
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|
328 |
self._CheckTransformCount( |
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|
329 |
transform_map, |
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|
330 |
images_service_pb.ImagesServiceTransform.IM_FEELING_LUCKY |
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|
331 |
) |
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|
332 |
logging.info("I'm Feeling Lucky autolevels will be visible once this " |
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|
333 |
"application is deployed.") |
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|
334 |
else: |
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|
335 |
logging.warn("Found no transformations found to perform.") |
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|
336 |
|
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337 |
return new_image |