Mercurial > boomslang

annotate pyntnclick/resources.py @ 638:d1ec9e739e23 pyntnclick

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Make TextWidget work (probably)
author Stefano Rivera <stefano@rivera.za.net>
date Sun, 12 Feb 2012 01:27:53 +0200
parents 85153f422522
children 43b49f1de828
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1 # -*- test-case-name: pyntnclick.tests.test_resources -*-
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2
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3 import os
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4 from pkg_resources import resource_filename
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5
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6 import pygame
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7
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8
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9 class ResourceNotFound(Exception):
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10 pass
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12
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13 class Resources(object):
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14 """Resource loader and manager.
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15
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16 The `CONVERT_ALPHA` flag allows alpha conversions to be disabled so that
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17 images may be loaded without having a display initialised. This is useful
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18 in unit tests, for example.
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19 """
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20
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21 DEFAULT_RESOURCE_MODULE = "pyntnclick.data"
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22 CONVERT_ALPHA = True
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23
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24 def __init__(self, resource_module, language=None):
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25 self.resource_module = resource_module
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26 self.language = language
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27 self._image_cache = {}
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28 self._font_cache = {}
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29 self._transformed_image_cache = {}
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30
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31 def get_resource_path(self, *resource_path_fragments):
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32 """Find the resource in one of a number of different places.
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33
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34 The following directories are searched, in order:
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35
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36 * <resource_module>/<lang>/
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37 * <resource_module>/
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38 * <default_resource_module>/<lang>/
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39 * <default_resource_module>/
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40
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41 If the `language` attribute is `None`, the paths with <lang> in them
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42 are skipped.
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43 """
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44 resource_name = '/'.join(resource_path_fragments)
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45 resource_name = os.path.join(*resource_name.split('/'))
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46 for path in self.get_paths(resource_name):
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47 if os.path.isfile(path):
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48 return path
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49 raise ResourceNotFound(resource_name)
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50
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51 def get_paths(self, resource_path):
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52 """Get list of resource paths to search.
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53 """
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54 paths = []
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55 for module in [self.resource_module, self.DEFAULT_RESOURCE_MODULE]:
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56 if self.language:
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57 fn = os.path.join(self.language, resource_path)
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58 paths.append(resource_filename(module, fn))
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59 paths.append(resource_filename(module, resource_path))
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60 return paths
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61
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62 def get_image(self, *image_name_fragments, **kw):
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63 """Load an image and optionally apply mutators.
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64
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65 All positional params end up in `image_name_fragments` and are joined
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66 with the path separator.
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67
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68 Two keyword parameters are also accepted:
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69
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70 * `transforms` may contain transforms, which modify an image in-place
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71 to apply various effects.
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72
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73 * `basedir` defaults to 'images', but may be overridden to load images
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74 from other places. ('icons', for example.)
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75 """
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76
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77 transforms = kw.get('transforms', ())
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78 basedir = kw.get('basedir', 'images')
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79
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80 image_path = self.get_resource_path(basedir, *image_name_fragments)
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81
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82 key = (image_path, transforms)
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83 if key in self._transformed_image_cache:
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84 # We already have this cached, so shortcut the whole process.
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85 return self._transformed_image_cache[key]
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86
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87 if image_path not in self._image_cache:
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88 image = pygame.image.load(image_path)
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89 if self.CONVERT_ALPHA:
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90 image = image.convert_alpha(pygame.display.get_surface())
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91 self._image_cache[image_path] = image
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92 image = self._image_cache[image_path]
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93
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94 # Apply any transforms we're given.
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95 for transform in transforms:
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96 image = transform(image)
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97 self._transformed_image_cache[key] = image
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98
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99 return image
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100
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101 def get_font(self, file_name, font_size, basedir=None):
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102 """Load a a font, cached if possible."""
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103 if basedir is None:
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104 basedir = 'fonts'
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105 key = (basedir, file_name, font_size)
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106 if key not in self._font_cache:
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107 fontfn = self.get_resource_path(basedir, file_name)
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108 self._font_cache[key] = pygame.font.Font(fontfn, font_size)
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109 return self._font_cache[key]