156 lines
No EOL
4.1 KiB
Python
156 lines
No EOL
4.1 KiB
Python
import os
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import pygame
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from OpenGL.GL import *
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class TextureFile(object):
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def __init__(self):
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self.id = None
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self.filename = None
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self.h = None
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self.w = None
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def load(self, filename):
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self.filename = filename
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img = files.mgr.png(filename)
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texid = glGenTextures(1)
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print "Generated texture id %s" % (texid,)
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self.id = texid
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imgdata = pygame.image.tostring(img, "RGBA")
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imgr = img.get_rect()
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self.h = imgr.h
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self.w = imgr.w
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dimension = GL_TEXTURE_2D
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glBindTexture(dimension, texid)
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glTexImage2D(dimension, 0, GL_RGBA8, imgr.w, imgr.h, 0, GL_RGBA, GL_UNSIGNED_BYTE, imgdata)
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glBindTexture(dimension, 0)
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class TexFont(object):
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def __init__(self):
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self.image = None
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self.start = None
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self.end = None
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self.rows = None
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self.cols = None
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self.charheight = None
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self.charwidth = None
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self.texwidth = None
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self.texheight = None
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self.gltex = None
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self.monospace = False
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self.charsizes = []
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@staticmethod
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def new(fontdir, fontname):
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tf = TexFont()
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tf.load_definition(os.path.join(fontdir, "%s.tfd" % (fontname,)))
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tf.load_texture(os.path.join(fontdir, "%s.png" % (fontname,)))
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return tf
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def mapchar(self, char):
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"""
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Maps a char to an index.
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Takes a character either as ascii ordinal number or as a 1-length string.
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Returns the index of that character in this texture font.
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If the character is not valid in this texture font, the index number will
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instead reference the last character in the font, which is usually a
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symbol for unknown characters (either totally blank or a box.)
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"""
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if isinstance(char, basestring):
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char = ord(char)
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if char >= self.start and char < self.end:
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return self.end - self.start - 1
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else:
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return char - self.start
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def get_coordinates(self, idx):
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"""
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Maps an index to their x, y coordinates in the texture.
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Invalid indexes will be mapped to the last character in the font.
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"""
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if idx < 0 or idx >= (self.end - self.start):
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idx = (self.end - self.start - 1)
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xp1 = (idx % self.cols) * self.charwidth
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yp1 = (idx // self.cols) * self.charheight
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if self.monospace:
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xp2 = xp + self.charwidth
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yp2 = yp + self.charheight
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else:
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xp2 = xp + self.charsizes[idx][0]
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yp2 = yp + self.charsizes[idx][1]
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xtc1 = (float(xp1) + 0.0) / self.texwidth
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ytc1 = (float(yp1) + 0.0) / self.texheight
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xtc2 = (float(xp2) - 1.0) / self.texwidth
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ytc2 = (float(yp2) - 1.0) / self.texheight
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return (xtc1, ytc1, xtc2, ytc2)
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def load_definition(self, deffile):
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"""
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Loads a texture font definition (.tfd).
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These simple datafiles are generated by fontmaker.py to provide character
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spacing information about the associated texture font.
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This should be called before load_texture.
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"""
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dd = open(deffile, 'r')
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if dd.readline() != "fontheader\n":
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raise ValueError('"%s" is not a font definition file' % (deffile,))
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def nextline(dd):
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return [int(x) for x in dd.readline().rstrip().split(',')]
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self.start, self.end = nextline(dd)
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self.charwidth, self.charheight = nextline(dd)
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self.cols, self.rows = nextline(dd)
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self.texwidth, self.texheight = nextline(dd)
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assert dd.readline() == "charsizes\n"
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self.charsizes = [None] * (self.end - self.start)
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monospace = True
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monoheight = True
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for i in xrange(0, (self.end - self.start)):
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x, y = nextline(dd)
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if x != self.charwidth:
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monospace = False
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if y != self.charheight:
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monoheight = False
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self.charsizes[i] = (x, y)
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"not yet capable of dealing properly with fonts of variable height"
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assert monoheight
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self.monospace = monospace
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def load_texture(self, texfile):
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"""
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Loads a texture image (.png)
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The PNG image should contain 32-bit color with alpha channel. The image
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will be loaded as an OpenGL texture.
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This function must be called after load_definition.
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"""
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tf = TextureFile()
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tf.load(texfile)
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self.gltex = tf
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assert self.gltex.w == self.texwidth
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assert self.gltex.h == self.texheight
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