def __init__(self, font, size=(256,256)):
self.font = font
self.packingY = 0
self.packingX = 0
self.lineHeight = 0
self.size = size
self.surface = pygame.Surface(size)
self.texture = Texture()
self.textureDirty = True
# To avoid mipmaps blending glyhps together, we have to
# leave a gap between glyphs equal to the number of mipmap levels we have.
self.gap = (int(math.log(size[0]) / math.log(2)),
int(math.log(size[1]) / math.log(2)))
class FontPage:
"""A collection of glyphs rendered to one texture"""
def __init__(self, font, size=(256,256)):
self.font = font
self.packingY = 0
self.packingX = 0
self.lineHeight = 0
self.size = size
self.surface = pygame.Surface(size)
self.texture = Texture()
self.textureDirty = True
# To avoid mipmaps blending glyhps together, we have to
# leave a gap between glyphs equal to the number of mipmap levels we have.
self.gap = (int(math.log(size[0]) / math.log(2)),
int(math.log(size[1]) / math.log(2)))
def updateTexture(self):
"""If necessary, update the texture from the surface"""
if not self.textureDirty:
return
self.texture.loadSurface(self.surface, monochrome=True)
self.textureDirty = False
def allocRect(self, size):
"""Allocate space for a rectangle of the given size on the texture.
Return a point indicating the top-left corner of the allocated
rectangle, or None if there is no room.
This implementation simply packs top-down left-to-right in rows.
"""
if size[0] > self.size[0]:
return None
if self.packingX + size[0] + self.gap[0] > self.size[0]:
# Next line
self.packingX = 0
self.packingY += self.lineHeight
self.lineHeight = 0
if self.packingY + size[1] > self.size[1]:
return None
if size[1] + self.gap[1] > self.lineHeight:
self.lineHeight = size[1] + self.gap[1]
allocated = (self.packingX, self.packingY)
self.packingX += size[0] + self.gap[0]
return allocated
def pack(self, char):
"""Pack the glyph for the given character into our texture, return a Glyph.
If there isn't enough room, return None.
"""
# Size the glyph and allocate space for it
glyphSize = self.font.size(char)
allocated = self.allocRect(glyphSize)
if not allocated:
return None
# Render the character and create a Glyph
self.surface.blit(self.font.render(char, True, (255,255,255), (0,0,0)), allocated)
self.textureDirty = True
return Glyph((allocated[0], allocated[1], glyphSize[0], glyphSize[1]), self)
