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1 """ |
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2 Use of PIL to render the image formatting stuff |
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3 """ |
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4 |
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5 from PIL import Image, ImageDraw, ImageFont |
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6 |
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7 from cStringIO import StringIO |
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8 |
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9 class PILImageFormatter (object) : |
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10 """ |
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11 Implements the basic image-rendering operations on top of format_txt |
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12 """ |
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13 |
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14 # the font we load |
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15 font = None |
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16 |
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17 def _load_font (self) : |
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18 """ |
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19 Use the configured img_ttf_path for a TrueType font, or a default one |
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20 """ |
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21 |
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22 if self.font : |
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23 pass |
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24 |
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25 elif self.img_ttf_path : |
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26 # load truetype with configured size |
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27 self.font = ImageFont.truetype(self.img_ttf_path, self.img_font_size) |
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28 |
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29 else : |
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30 # default |
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31 self.font = ImageFont.load_default() |
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32 |
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33 return self.font |
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34 |
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35 def format_png (self, lines, **kwargs) : |
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36 # load font |
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37 font = self._load_font() |
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38 |
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39 # build list of plain-text line data |
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40 lines = list(data for line, data in self.format_txt(lines, **kwargs)) |
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41 |
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42 # lines sizes |
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43 line_sizes = [font.getsize(line) for line in lines] |
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44 |
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45 # figure out how wide/high the image will be |
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46 width = max(width for width, height in line_sizes) |
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47 height = sum(height for width, height in line_sizes) |
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48 |
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49 # create new B/W image |
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50 img = Image.new('L', (width, height), 0xff) |
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51 |
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52 # drawer |
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53 draw = ImageDraw.Draw(img) |
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54 |
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55 # starting offset |
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56 offset_y = 0 |
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57 |
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58 # draw the lines |
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59 for line, (width, height) in zip(lines, line_sizes) : |
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60 # draw |
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61 draw.text((0, offset_y), line, font=font) |
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62 |
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63 # next offset |
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64 offset_y += height |
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65 |
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66 # output buffer |
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67 buf = StringIO() |
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68 |
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69 # save |
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70 img.save(buf, 'png') |
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71 |
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72 # return data |
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73 return buf.getvalue() |
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74 |