import os
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import io
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import math
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from .tasks import TaskNestedView
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from rest_framework import exceptions
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from app.models.task import assets_directory_path
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from PIL import Image, ImageDraw, ImageOps
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from django.http import HttpResponse
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from .tasks import download_file_response
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from .common import hex2rgb
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import numpy as np
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def normalize(img):
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"""
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Linear normalization
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http://en.wikipedia.org/wiki/Normalization_%28image_processing%29
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"""
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arr = np.array(img).astype('float')
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minval = arr.min()
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maxval = arr.max()
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if minval != maxval:
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arr -= minval
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arr *= (255.0/(maxval-minval))
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return Image.fromarray(arr)
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class Thumbnail(TaskNestedView):
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def get(self, request, pk=None, project_pk=None, image_filename=""):
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"""
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Generate a thumbnail on the fly for a particular task's image
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"""
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task = self.get_and_check_task(request, pk)
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image_path = task.get_image_path(image_filename)
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if not os.path.isfile(image_path):
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raise exceptions.NotFound()
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try:
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thumb_size = int(self.request.query_params.get('size', 512))
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if thumb_size < 1:
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raise ValueError()
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quality = int(self.request.query_params.get('quality', 75))
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if quality < 0 or quality > 100:
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raise ValueError()
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center_x = float(self.request.query_params.get('center_x', '0.5'))
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center_y = float(self.request.query_params.get('center_y', '0.5'))
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if center_x < -0.5 or center_x > 1.5 or center_y < -0.5 or center_y > 1.5:
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raise ValueError()
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draw_points = self.request.query_params.getlist('draw_point')
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point_colors = self.request.query_params.getlist('point_color')
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point_radiuses = self.request.query_params.getlist('point_radius')
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points = []
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i = 0
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for p in draw_points:
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coords = list(map(float, p.split(",")))
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if len(coords) != 2:
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raise ValueError()
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points.append({
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'x': coords[0],
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'y': coords[1],
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'color': hex2rgb(point_colors[i]) if i < len(point_colors) else (255, 255, 255),
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'radius': float(point_radiuses[i]) if i < len(point_radiuses) else 1.0,
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})
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i += 1
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zoom = float(self.request.query_params.get('zoom', '1'))
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if zoom < 0.1 or zoom > 10:
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raise ValueError()
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except ValueError:
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raise exceptions.ValidationError("Invalid query parameters")
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with Image.open(image_path) as img:
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if img.mode != 'RGB':
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img = normalize(img)
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img = img.convert('RGB')
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w, h = img.size
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thumb_size = min(max(w, h), thumb_size)
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# Move image center
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if center_x != 0.5 or center_y != 0.5:
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img = img.crop((
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w * (center_x - 0.5),
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h * (center_y - 0.5),
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w * (center_x + 0.5),
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h * (center_y + 0.5)
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))
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# Scale
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scale_factor = 1
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off_x = 0
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off_y = 0
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if zoom != 1:
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scale_factor = (2 ** (zoom - 1))
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off_x = w / 2.0 - w / scale_factor / 2.0
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off_y = h / 2.0 - h / scale_factor / 2.0
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win = img.crop((off_x, off_y,
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off_x + (w / scale_factor),
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off_y + (h / scale_factor)
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))
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img = ImageOps.scale(win, scale_factor, Image.NEAREST)
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sw, sh = w * scale_factor, h * scale_factor
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# Draw points
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for p in points:
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d = ImageDraw.Draw(img)
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r = p['radius'] * max(w, h) / 100.0
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sx = (p['x'] + (0.5 - center_x)) * sw
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sy = (p['y'] + (0.5 - center_y)) * sh
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x = sx - off_x * scale_factor
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y = sy - off_y * scale_factor
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d.ellipse([(x - r, y - r),
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(x + r, y + r)], outline=p['color'], width=int(max(1.0, math.floor(r / 3.0))))
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img.thumbnail((thumb_size, thumb_size))
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output = io.BytesIO()
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img.save(output, format='JPEG', quality=quality, progressive=True)
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res = HttpResponse(content_type="image/jpeg")
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res['Content-Disposition'] = 'inline'
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res.write(output.getvalue())
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output.close()
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return res
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class ImageDownload(TaskNestedView):
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def get(self, request, pk=None, project_pk=None, image_filename=""):
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"""
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Download a task's image
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"""
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task = self.get_and_check_task(request, pk)
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image_path = task.get_image_path(image_filename)
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if not os.path.isfile(image_path):
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raise exceptions.NotFound()
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return download_file_response(request, image_path, 'attachment')
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