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heroes-renaissance/pyglet/image/__init__.py

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initial version
2008-11-23 20:07:47 +00:00
# ----------------------------------------------------------------------------
# pyglet
# Copyright (c) 2006-2008 Alex Holkner
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
# * Redistributions of source code must retain the above copyright
# notice, this list of conditions and the following disclaimer.
# * Redistributions in binary form must reproduce the above copyright
# notice, this list of conditions and the following disclaimer in
# the documentation and/or other materials provided with the
# distribution.
# * Neither the name of pyglet nor the names of its
# contributors may be used to endorse or promote products
# derived from this software without specific prior written
# permission.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
# POSSIBILITY OF SUCH DAMAGE.
# ----------------------------------------------------------------------------
'''Image load, capture and high-level texture functions.
Only basic functionality is described here; for full reference see the
accompanying documentation.
To load an image::
from pyglet import image
pic = image.load('picture.png')
The supported image file types include PNG, BMP, GIF, JPG, and many more,
somewhat depending on the operating system. To load an image from a file-like
object instead of a filename::
pic = image.load('hint.jpg', file=fileobj)
The hint helps the module locate an appropriate decoder to use based on the
file extension. It is optional.
Once loaded, images can be used directly by most other modules of pyglet. All
images have a width and height you can access::
width, height = pic.width, pic.height
You can extract a region of an image (this keeps the original image intact;
the memory is shared efficiently)::
subimage = pic.get_region(x, y, width, height)
Remember that y-coordinates are always increasing upwards.
Drawing images
--------------
To draw an image at some point on the screen::
pic.blit(x, y, z)
This assumes an appropriate view transform and projection have been applied.
Some images have an intrinsic "anchor point": this is the point which will be
aligned to the ``x`` and ``y`` coordinates when the image is drawn. By
default the anchor point is the lower-left corner of the image. You can use
the anchor point to center an image at a given point, for example::
pic.anchor_x = pic.width // 2
pic.anchor_y = pic.height // 2
pic.blit(x, y, z)
Texture access
--------------
If you are using OpenGL directly, you can access the image as a texture::
texture = pic.get_texture()
(This is the most efficient way to obtain a texture; some images are
immediately loaded as textures, whereas others go through an intermediate
form). To use a texture with pyglet.gl::
from pyglet.gl import *
glEnable(texture.target) # typically target is GL_TEXTURE_2D
glBindTexture(texture.target, texture.id)
# ... draw with the texture
Pixel access
------------
To access raw pixel data of an image::
rawimage = pic.get_image_data()
(If the image has just been loaded this will be a very quick operation;
however if the image is a texture a relatively expensive readback operation
will occur). The pixels can be accessed as a string::
format = 'RGBA'
pitch = rawimage.width * len(format)
pixels = rawimage.get_data(format, pitch)
"format" strings consist of characters that give the byte order of each color
component. For example, if rawimage.format is 'RGBA', there are four color
components: red, green, blue and alpha, in that order. Other common format
strings are 'RGB', 'LA' (luminance, alpha) and 'I' (intensity).
The "pitch" of an image is the number of bytes in a row (this may validly be
more than the number required to make up the width of the image, it is common
to see this for word alignment). If "pitch" is negative the rows of the image
are ordered from top to bottom, otherwise they are ordered from bottom to top.
Retrieving data with the format and pitch given in `ImageData.format` and
`ImageData.pitch` avoids the need for data conversion (assuming you can make
use of the data in this arbitrary format).
'''
__docformat__ = 'restructuredtext'
__version__ = '$Id: __init__.py 2253 2008-09-10 23:57:35Z Alex.Holkner $'
import sys
import re
import warnings
import weakref
from ctypes import *
from math import ceil
from StringIO import StringIO
from pyglet import gl
from pyglet.gl import *
from pyglet.gl import gl_info
from pyglet import graphics
from pyglet.window import *
from pyglet.image import atlas
class ImageException(Exception):
pass
def load(filename, file=None, decoder=None):
'''Load an image from a file.
:note: You can make no assumptions about the return type; usually it will
be ImageData or CompressedImageData, but decoders are free to return
any subclass of AbstractImage.
:Parameters:
`filename` : str
Used to guess the image format, and to load the file if `file` is
unspecified.
`file` : file-like object or None
Source of image data in any supported format.
`decoder` : ImageDecoder or None
If unspecified, all decoders that are registered for the filename
extension are tried. If none succeed, the exception from the
first decoder is raised.
:rtype: AbstractImage
'''
if not file:
file = open(filename, 'rb')
if not hasattr(file, 'seek'):
file = StringIO(file.read())
if decoder:
return decoder.decode(file, filename)
else:
first_exception = None
for decoder in codecs.get_decoders(filename):
try:
image = decoder.decode(file, filename)
return image
except codecs.ImageDecodeException, e:
first_exception = first_exception or e
file.seek(0)
if not first_exception:
raise codecs.ImageDecodeException('No image decoders are available')
raise first_exception
def create(width, height, pattern=None):
'''Create an image optionally filled with the given pattern.
:note: You can make no assumptions about the return type; usually it will
be ImageData or CompressedImageData, but patterns are free to return
any subclass of AbstractImage.
:Parameters:
`width` : int
Width of image to create
`height` : int
Height of image to create
`pattern` : ImagePattern or None
Pattern to fill image with. If unspecified, the image will
intially be transparent.
:rtype: AbstractImage
'''
if not pattern:
pattern = SolidColorImagePattern()
return pattern.create_image(width, height)
class ImagePattern(object):
'''Abstract image creation class.'''
def create_image(width, height):
'''Create an image of the given size.
:Parameters:
`width` : int
Width of image to create
`height` : int
Height of image to create
:rtype: AbstractImage
'''
raise NotImplementedError('abstract')
class SolidColorImagePattern(ImagePattern):
'''Creates an image filled with a solid color.'''
def __init__(self, color=(0, 0, 0, 0)):
'''Create a solid image pattern with the given color.
:Parameters:
`color` : (int, int, int, int)
4-tuple of ints in range [0,255] giving RGBA components of
color to fill with.
'''
self.color = '%c%c%c%c' % color
def create_image(self, width, height):
data = self.color * width * height
return ImageData(width, height, 'RGBA', data)
class CheckerImagePattern(ImagePattern):
'''Create an image with a tileable checker image.
'''
def __init__(self, color1=(150,150,150,255), color2=(200,200,200,255)):
'''Initialise with the given colors.
:Parameters:
`color1` : (int, int, int, int)
4-tuple of ints in range [0,255] giving RGBA components of
color to fill with. This color appears in the top-left and
bottom-right corners of the image.
`color2` : (int, int, int, int)
4-tuple of ints in range [0,255] giving RGBA components of
color to fill with. This color appears in the top-right and
bottom-left corners of the image.
'''
self.color1 = '%c%c%c%c' % color1
self.color2 = '%c%c%c%c' % color2
def create_image(self, width, height):
hw = width/2
hh = height/2
row1 = self.color1 * hw + self.color2 * hw
row2 = self.color2 * hw + self.color1 * hw
data = row1 * hh + row2 * hh
return ImageData(width, height, 'RGBA', data)
class AbstractImage(object):
'''Abstract class representing an image.
:Ivariables:
`width` : int
Width of image
`height` : int
Height of image
`anchor_x` : int
X coordinate of anchor, relative to left edge of image data
`anchor_y` : int
Y coordinate of anchor, relative to bottom edge of image data
'''
anchor_x = 0
anchor_y = 0
def __init__(self, width, height):
self.width = width
self.height = height
def __repr__(self):
return '<%s %dx%d>' % (self.__class__.__name__, self.width, self.height)
def get_image_data(self):
'''Get an ImageData view of this image.
Changes to the returned instance may or may not be reflected in this
image.
:rtype: `ImageData`
:since: pyglet 1.1
'''
raise ImageException('Cannot retrieve image data for %r' % self)
image_data = property(lambda self: self.get_image_data(),
doc='''An `ImageData` view of this image.
Changes to the returned instance may or may not be reflected in this
image. Read-only.
:deprecated: Use `get_image_data`.
:type: `ImageData`
''')
def get_texture(self, rectangle=False):
'''A `Texture` view of this image.
By default, textures are created with dimensions that are powers of
two. Smaller images will return a `TextureRegion` that covers just
the image portion of the larger texture. This restriction is required
on older video cards, and for compressed textures, or where texture
repeat modes will be used, or where mipmapping is desired.
If the `rectangle` parameter is ``True``, this restriction is ignored
and a texture the size of the image may be created if the driver
supports the ``GL_ARB_texture_rectangle`` or
``GL_NV_texture_rectangle`` extensions. If the extensions are not
present or the image already is a texture, the `rectangle` parameter
is ignored.
Examine `Texture.target` to determine if the returned texture is a
rectangle (``GL_TEXTURE_RECTANGLE_ARB`` or
``GL_TEXTURE_RECTANGLE_NV``) or not (``GL_TEXTURE_2D``).
Changes to the returned instance may or may not be reflected in this
image.
:Parameters:
`rectangle` : bool
True if the texture can be created as a rectangle.
:rtype: `Texture`
:since: pyglet 1.1
'''
raise ImageException('Cannot retrieve texture for %r' % self)
texture = property(lambda self: self.get_texture(),
doc='''Get a `Texture` view of this image.
Changes to the returned instance may or may not be reflected in this
image.
:deprecated: Use `get_texture`.
:type: `Texture`
''')
def get_mipmapped_texture(self):
'''Retrieve a `Texture` instance with all mipmap levels filled in.
Requires that image dimensions be powers of 2.
:rtype: `Texture`
:since: pyglet 1.1
'''
raise ImageException('Cannot retrieve mipmapped texture for %r' % self)
mipmapped_texture = property(lambda self: self.get_mipmapped_texture(),
doc='''A Texture view of this image.
The returned Texture will have mipmaps filled in for all levels.
Requires that image dimensions be powers of 2. Read-only.
:deprecated: Use `get_mipmapped_texture`.
:type: `Texture`
''')
def get_region(self, x, y, width, height):
'''Retrieve a rectangular region of this image.
:Parameters:
`x` : int
Left edge of region.
`y` : int
Bottom edge of region.
`width` : int
Width of region.
`height` : int
Height of region.
:rtype: AbstractImage
'''
raise ImageException('Cannot get region for %r' % self)
def save(self, filename=None, file=None, encoder=None):
'''Save this image to a file.
:Parameters:
`filename` : str
Used to set the image file format, and to open the output file
if `file` is unspecified.
`file` : file-like object or None
File to write image data to.
`encoder` : ImageEncoder or None
If unspecified, all encoders matching the filename extension
are tried. If all fail, the exception from the first one
attempted is raised.
'''
if not file:
file = open(filename, 'wb')
if encoder:
encoder.encode(self, file, filename)
else:
first_exception = None
for encoder in codecs.get_encoders(filename):
try:
encoder.encode(self, file, filename)
return
except codecs.ImageDecodeException, e:
first_exception = first_exception or e
file.seek(0)
if not first_exception:
raise codecs.ImageEncodeException(
'No image encoders are available')
raise first_exception
def blit(self, x, y, z=0):
'''Draw this image to the active framebuffers.
The image will be drawn with the lower-left corner at
(``x -`` `anchor_x`, ``y -`` `anchor_y`, ``z``).
'''
raise ImageException('Cannot blit %r.' % self)
def blit_into(self, source, x, y, z):
'''Draw `source` on this image.
`source` will be copied into this image such that its anchor point
is aligned with the `x` and `y` parameters. If this image is a 3D
texture, the `z` coordinate gives the image slice to copy into.
Note that if `source` is larger than this image (or the positioning
would cause the copy to go out of bounds) then you must pass a
region of `source` to this method, typically using get_region().
'''
raise ImageException('Cannot blit images onto %r.' % self)
def blit_to_texture(self, target, level, x, y, z=0):
'''Draw this image on the currently bound texture at `target`.
This image is copied into the texture such that this image's anchor
point is aligned with the given `x` and `y` coordinates of the
destination texture. If the currently bound texture is a 3D texture,
the `z` coordinate gives the image slice to blit into.
'''
raise ImageException('Cannot blit %r to a texture.' % self)
class AbstractImageSequence(object):
'''Abstract sequence of images.
The sequence is useful for storing image animations or slices of a volume.
For efficient access, use the `texture_sequence` member. The class
also implements the sequence interface (`__len__`, `__getitem__`,
`__setitem__`).
'''
def get_texture_sequence(self):
'''Get a TextureSequence.
:rtype: `TextureSequence`
:since: pyglet 1.1
'''
raise NotImplementedError('abstract')
texture_sequence = property(lambda self: self.get_texture_sequence(),
doc='''Access this image sequence as a texture sequence.
:deprecated: Use `get_texture_sequence`
:type: `TextureSequence`
''')
def get_animation(self, period, loop=True):
'''Create an animation over this image sequence for the given constant
framerate.
:Parameters
`period` : float
Number of seconds to display each frame.
`loop` : bool
If True, the animation will loop continuously.
:rtype: `Animation`
:since: pyglet 1.1
'''
return Animation.from_image_sequence(self, period, loop)
def __getitem__(self, slice):
'''Retrieve a (list of) image.
:rtype: AbstractImage
'''
raise NotImplementedError('abstract')
def __setitem__(self, slice, image):
'''Replace one or more images in the sequence.
:Parameters:
`image` : `AbstractImage`
The replacement image. The actual instance may not be used,
depending on this implementation.
'''
raise NotImplementedError('abstract')
def __len__(self):
raise NotImplementedError('abstract')
def __iter__(self):
'''Iterate over the images in sequence.
:rtype: Iterator
:since: pyglet 1.1
'''
raise NotImplementedError('abstract')
class TextureSequence(AbstractImageSequence):
'''Interface for a sequence of textures.
Typical implementations store multiple `TextureRegion` s within one
`Texture` so as to minimise state changes.
'''
def get_texture_sequence(self):
return self
class UniformTextureSequence(TextureSequence):
'''Interface for a sequence of textures, each with the same dimensions.
:Ivariables:
`item_width` : int
Width of each texture in the sequence.
`item_height` : int
Height of each texture in the sequence.
'''
def _get_item_width(self):
raise NotImplementedError('abstract')
item_width = property(_get_item_width)
def _get_item_height(self):
raise NotImplementedError('abstract')
item_height = property(_get_item_height)
class ImageData(AbstractImage):
'''An image represented as a string of unsigned bytes.
:Ivariables:
`data` : str
Pixel data, encoded according to `format` and `pitch`.
`format` : str
The format string to use when reading or writing `data`.
`pitch` : int
Number of bytes per row. Negative values indicate a top-to-bottom
arrangement.
Setting the `format` and `pitch` instance variables and reading `data` is
deprecated; use `get_data` and `set_data` in new applications. (Reading
`format` and `pitch` to obtain the current encoding is not deprecated).
'''
_swap1_pattern = re.compile('(.)', re.DOTALL)
_swap2_pattern = re.compile('(.)(.)', re.DOTALL)
_swap3_pattern = re.compile('(.)(.)(.)', re.DOTALL)
_swap4_pattern = re.compile('(.)(.)(.)(.)', re.DOTALL)
_current_texture = None
_current_mipmap_texture = None
def __init__(self, width, height, format, data, pitch=None):
'''Initialise image data.
:Parameters:
`width` : int
Width of image data
`height` : int
Height of image data
`format` : str
A valid format string, such as 'RGB', 'RGBA', 'ARGB', etc.
`data` : sequence
String or array/list of bytes giving the decoded data.
`pitch` : int or None
If specified, the number of bytes per row. Negative values
indicate a top-to-bottom arrangement. Defaults to
``width * len(format)``.
'''
super(ImageData, self).__init__(width, height)
self._current_format = self._desired_format = format.upper()
self._current_data = data
if not pitch:
pitch = width * len(format)
self._current_pitch = self.pitch = pitch
self.mipmap_images = []
def __getstate__(self):
return {
'width': self.width,
'height': self.height,
'_current_data':
self.get_data(self._current_format, self._current_pitch),
'_current_format': self._current_format,
'_desired_format': self._desired_format,
'_current_pitch': self._current_pitch,
'pitch': self.pitch,
'mipmap_images': self.mipmap_images
}
def get_image_data(self):
return self
def _set_format(self, format):
self._desired_format = format.upper()
self._current_texture = None
format = property(lambda self: self._desired_format, _set_format,
doc='''Format string of the data. Read-write.
:type: str
''')
def _get_data(self):
if self._current_pitch != self.pitch or \
self._current_format != self.format:
self._current_data = self._convert(self.format, self.pitch)
self._current_format = self.format
self._current_pitch = self.pitch
self._ensure_string_data()
return self._current_data
def _set_data(self, data):
self._current_data = data
self._current_format = self.format
self._current_pitch = self.pitch
self._current_texture = None
self._current_mipmapped_texture = None
data = property(_get_data, _set_data,
doc='''The byte data of the image. Read-write.
:deprecated: Use `get_data` and `set_data`.
:type: sequence of bytes, or str
''')
def get_data(self, format, pitch):
'''Get the byte data of the image.
:Parameters:
`format` : str
Format string of the return data.
`pitch` : int
Number of bytes per row. Negative values indicate a
top-to-bottom arrangement.
:since: pyglet 1.1
:rtype: sequence of bytes, or str
'''
if format == self._current_format and pitch == self._current_pitch:
return self._current_data
return self._convert(format, pitch)
def set_data(self, format, pitch, data):
'''Set the byte data of the image.
:Parameters:
`format` : str
Format string of the return data.
`pitch` : int
Number of bytes per row. Negative values indicate a
top-to-bottom arrangement.
`data` : str or sequence of bytes
Image data.
:since: pyglet 1.1
'''
self._current_format = format
self._current_pitch = pitch
self._current_data = data
self._current_texture = None
self._current_mipmapped_texture = None
def set_mipmap_image(self, level, image):
'''Set a mipmap image for a particular level.
The mipmap image will be applied to textures obtained via
`get_mipmapped_texture`.
:Parameters:
`level` : int
Mipmap level to set image at, must be >= 1.
`image` : AbstractImage
Image to set. Must have correct dimensions for that mipmap
level (i.e., width >> level, height >> level)
'''
if level == 0:
raise ImageException(
'Cannot set mipmap image at level 0 (it is this image)')
if not _is_pow2(self.width) or not _is_pow2(self.height):
raise ImageException(
'Image dimensions must be powers of 2 to use mipmaps.')
# Check dimensions of mipmap
width, height = self.width, self.height
for i in range(level):
width >>= 1
height >>= 1
if width != image.width or height != image.height:
raise ImageException(
'Mipmap image has wrong dimensions for level %d' % level)
# Extend mipmap_images list to required level
self.mipmap_images += [None] * (level - len(self.mipmap_images))
self.mipmap_images[level - 1] = image
def create_texture(self, cls, rectangle=False):
'''Create a texture containing this image.
If the image's dimensions are not powers of 2, a TextureRegion of
a larger Texture will be returned that matches the dimensions of this
image.
:Parameters:
`cls` : class (subclass of Texture)
Class to construct.
`rectangle` : bool
``True`` if a rectangle can be created; see
`AbstractImage.get_texture`.
**Since:** pyglet 1.1
:rtype: cls or cls.region_class
'''
internalformat = self._get_internalformat(self.format)
texture = cls.create(self.width, self.height, internalformat, rectangle)
if self.anchor_x or self.anchor_y:
texture.anchor_x = self.anchor_x
texture.anchor_y = self.anchor_y
self.blit_to_texture(texture.target, texture.level,
self.anchor_x, self.anchor_y, 0, None)
return texture
def get_texture(self, rectangle=False):
if not self._current_texture:
self._current_texture = self.create_texture(Texture, rectangle)
return self._current_texture
def get_mipmapped_texture(self):
'''Return a Texture with mipmaps.
If `set_mipmap_image` has been called with at least one image, the set
of images defined will be used. Otherwise, mipmaps will be
automatically generated.
The texture dimensions must be powers of 2 to use mipmaps.
:rtype: `Texture`
:since: pyglet 1.1
'''
if self._current_mipmap_texture:
return self._current_mipmap_texture
if not _is_pow2(self.width) or not _is_pow2(self.height):
raise ImageException(
'Image dimensions must be powers of 2 to use mipmaps.')
texture = Texture.create_for_size(
GL_TEXTURE_2D, self.width, self.height)
if self.anchor_x or self.anchor_y:
texture.anchor_x = self.anchor_x
texture.anchor_y = self.anchor_y
internalformat = self._get_internalformat(self.format)
glBindTexture(texture.target, texture.id)
glTexParameteri(texture.target, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR)
if self.mipmap_images:
self.blit_to_texture(texture.target, texture.level,
self.anchor_x, self.anchor_y, 0, internalformat)
level = 0
for image in self.mipmap_images:
level += 1
if image:
image.blit_to_texture(texture.target, level,
self.anchor_x, self.anchor_y, 0, internalformat)
# TODO: should set base and max mipmap level if some mipmaps
# are missing.
elif gl_info.have_version(1, 4):
glTexParameteri(texture.target, GL_GENERATE_MIPMAP, GL_TRUE)
self.blit_to_texture(texture.target, texture.level,
self.anchor_x, self.anchor_y, 0, internalformat)
else:
raise NotImplementedError('TODO: gluBuild2DMipmaps')
self._current_mipmap_texture = texture
return texture
def get_region(self, x, y, width, height):
'''Retrieve a rectangular region of this image data.
:Parameters:
`x` : int
Left edge of region.
`y` : int
Bottom edge of region.
`width` : int
Width of region.
`height` : int
Height of region.
:rtype: ImageDataRegion
'''
return ImageDataRegion(x, y, width, height, self)
def blit(self, x, y, z=0, width=None, height=None):
self.get_texture().blit(x, y, z, width, height)
def blit_to_texture(self, target, level, x, y, z, internalformat=None):
'''Draw this image to to the currently bound texture at `target`.
This image's anchor point will be aligned to the given `x` and `y`
coordinates. If the currently bound texture is a 3D texture, the `z`
parameter gives the image slice to blit into.
If `internalformat` is specified, glTexImage is used to initialise
the texture; otherwise, glTexSubImage is used to update a region.
'''
x -= self.anchor_x
y -= self.anchor_y
data_format = self.format
data_pitch = abs(self._current_pitch)
# Determine pixel format from format string
matrix = None
format, type = self._get_gl_format_and_type(data_format)
if format is None:
if (len(data_format) in (3, 4) and
gl_info.have_extension('GL_ARB_imaging')):
# Construct a color matrix to convert to GL_RGBA
def component_column(component):
try:
pos = 'RGBA'.index(component)
return [0] * pos + [1] + [0] * (3 - pos)
except ValueError:
return [0, 0, 0, 0]
# pad to avoid index exceptions
lookup_format = data_format + 'XXX'
matrix = (component_column(lookup_format[0]) +
component_column(lookup_format[1]) +
component_column(lookup_format[2]) +
component_column(lookup_format[3]))
format = {
3: GL_RGB,
4: GL_RGBA}.get(len(data_format))
type = GL_UNSIGNED_BYTE
glMatrixMode(GL_COLOR)
glPushMatrix()
glLoadMatrixf((GLfloat * 16)(*matrix))
else:
# Need to convert data to a standard form
data_format = {
1: 'L',
2: 'LA',
3: 'RGB',
4: 'RGBA'}.get(len(data_format))
format, type = self._get_gl_format_and_type(data_format)
# Workaround: don't use GL_UNPACK_ROW_LENGTH
if gl.current_context._workaround_unpack_row_length:
data_pitch = self.width * len(data_format)
# Get data in required format (hopefully will be the same format it's
# already in, unless that's an obscure format, upside-down or the
# driver is old).
data = self._convert(data_format, data_pitch)
if data_pitch & 0x1:
alignment = 1
elif data_pitch & 0x2:
alignment = 2
else:
alignment = 4
row_length = data_pitch / len(data_format)
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT)
glPixelStorei(GL_UNPACK_ALIGNMENT, alignment)
glPixelStorei(GL_UNPACK_ROW_LENGTH, row_length)
self._apply_region_unpack()
if target == GL_TEXTURE_3D:
assert not internalformat
glTexSubImage3D(target, level,
x, y, z,
self.width, self.height, 1,
format, type,
data)
elif internalformat:
glTexImage2D(target, level,
internalformat,
self.width, self.height,
0,
format, type,
data)
else:
glTexSubImage2D(target, level,
x, y,
self.width, self.height,
format, type,
data)
glPopClientAttrib()
if matrix:
glPopMatrix()
glMatrixMode(GL_MODELVIEW)
# Flush image upload before data get GC'd.
glFlush()
def _apply_region_unpack(self):
pass
def _convert(self, format, pitch):
'''Return data in the desired format; does not alter this instance's
current format or pitch.
'''
if format == self._current_format and pitch == self._current_pitch:
return self._current_data
self._ensure_string_data()
data = self._current_data
current_pitch = self._current_pitch
current_format = self._current_format
sign_pitch = current_pitch / abs(current_pitch)
if format != self._current_format:
# Create replacement string, e.g. r'\4\1\2\3' to convert RGBA to
# ARGB
repl = ''
for c in format:
try:
idx = current_format.index(c) + 1
except ValueError:
idx = 1
repl += r'\%d' % idx
if len(current_format) == 1:
swap_pattern = self._swap1_pattern
elif len(current_format) == 2:
swap_pattern = self._swap2_pattern
elif len(current_format) == 3:
swap_pattern = self._swap3_pattern
elif len(current_format) == 4:
swap_pattern = self._swap4_pattern
else:
raise ImageException(
'Current image format is wider than 32 bits.')
packed_pitch = self.width * len(current_format)
if abs(self._current_pitch) != packed_pitch:
# Pitch is wider than pixel data, need to go row-by-row.
rows = re.findall(
'.' * abs(self._current_pitch), data, re.DOTALL)
rows = [swap_pattern.sub(repl, r[:packed_pitch]) for r in rows]
data = ''.join(rows)
else:
# Rows are tightly packed, apply regex over whole image.
data = swap_pattern.sub(repl, data)
# After conversion, rows will always be tightly packed
current_pitch = sign_pitch * (len(format) * self.width)
if pitch != current_pitch:
diff = abs(current_pitch) - abs(pitch)
if diff > 0:
# New pitch is shorter than old pitch, chop bytes off each row
pattern = re.compile(
'(%s)%s' % ('.' * abs(pitch), '.' * diff), re.DOTALL)
data = pattern.sub(r'\1', data)
elif diff < 0:
# New pitch is longer than old pitch, add '0' bytes to each row
pattern = re.compile(
'(%s)' % ('.' * abs(current_pitch)), re.DOTALL)
pad = '.' * -diff
data = pattern.sub(r'\1%s' % pad, data)
if current_pitch * pitch < 0:
# Pitch differs in sign, swap row order
rows = re.findall('.' * abs(pitch), data, re.DOTALL)
rows.reverse()
data = ''.join(rows)
return data
def _ensure_string_data(self):
if type(self._current_data) is not str:
buf = create_string_buffer(len(self._current_data))
memmove(buf, self._current_data, len(self._current_data))
self._current_data = buf.raw
def _get_gl_format_and_type(self, format):
if format == 'I':
return GL_LUMINANCE, GL_UNSIGNED_BYTE
elif format == 'L':
return GL_LUMINANCE, GL_UNSIGNED_BYTE
elif format == 'LA':
return GL_LUMINANCE_ALPHA, GL_UNSIGNED_BYTE
elif format == 'R':
return GL_RED, GL_UNSIGNED_BYTE
elif format == 'G':
return GL_GREEN, GL_UNSIGNED_BYTE
elif format == 'B':
return GL_BLUE, GL_UNSIGNED_BYTE
elif format == 'A':
return GL_ALPHA, GL_UNSIGNED_BYTE
elif format == 'RGB':
return GL_RGB, GL_UNSIGNED_BYTE
elif format == 'RGBA':
return GL_RGBA, GL_UNSIGNED_BYTE
elif (format == 'ARGB' and
gl_info.have_extension('GL_EXT_bgra') and
gl_info.have_extension('GL_APPLE_packed_pixels')):
return GL_BGRA, GL_UNSIGNED_INT_8_8_8_8_REV
elif (format == 'ABGR' and
gl_info.have_extension('GL_EXT_abgr')):
return GL_ABGR_EXT, GL_UNSIGNED_BYTE
elif (format == 'BGR' and
gl_info.have_extension('GL_EXT_bgra')):
return GL_BGR, GL_UNSIGNED_BYTE
elif (format == 'BGRA' and
gl_info.have_extension('GL_EXT_bgra')):
return GL_BGRA, GL_UNSIGNED_BYTE
return None, None
def _get_internalformat(self, format):
if len(format) == 4:
return GL_RGBA
elif len(format) == 3:
return GL_RGB
elif len(format) == 2:
return GL_LUMINANCE_ALPHA
elif format == 'A':
return GL_ALPHA
elif format == 'L':
return GL_LUMINANCE
elif format == 'I':
return GL_INTENSITY
return GL_RGBA
class ImageDataRegion(ImageData):
def __init__(self, x, y, width, height, image_data):
super(ImageDataRegion, self).__init__(width, height,
image_data._current_format, image_data._current_data,
image_data._current_pitch)
self.x = x
self.y = y
def __getstate__(self):
return {
'width': self.width,
'height': self.height,
'_current_data':
self.get_data(self._current_format, self._current_pitch),
'_current_format': self._current_format,
'_desired_format': self._desired_format,
'_current_pitch': self._current_pitch,
'pitch': self.pitch,
'mipmap_images': self.mipmap_images,
'x': self.x,
'y': self.y
}
def _get_data(self):
# Crop the data first
x1 = len(self._current_format) * self.x
x2 = len(self._current_format) * (self.x + self.width)
self._ensure_string_data()
data = self._convert(self._current_format, abs(self._current_pitch))
rows = re.findall('.' * abs(self._current_pitch), data, re.DOTALL)
rows = [row[x1:x2] for row in rows[self.y:self.y+self.height]]
self._current_data = ''.join(rows)
self._current_pitch = self.width * len(self._current_format)
self._current_texture = None
self.x = 0
self.y = 0
return super(ImageDataRegion, self)._get_data()
def _set_data(self, data):
self.x = 0
self.y = 0
super(ImageDataRegion, self)._set_data(data)
data = property(_get_data, _set_data)
def get_data(self, format, pitch):
x1 = len(self._current_format) * self.x
x2 = len(self._current_format) * (self.x + self.width)
self._ensure_string_data()
data = self._convert(self._current_format, abs(self._current_pitch))
rows = re.findall('.' * abs(self._current_pitch), data, re.DOTALL)
rows = [row[x1:x2] for row in rows[self.y:self.y+self.height]]
self._current_data = ''.join(rows)
self._current_pitch = self.width * len(self._current_format)
self._current_texture = None
self.x = 0
self.y = 0
return super(ImageDataRegion, self).get_data(format, pitch)
def _apply_region_unpack(self):
glPixelStorei(GL_UNPACK_SKIP_PIXELS, self.x)
glPixelStorei(GL_UNPACK_SKIP_ROWS, self.y)
def _ensure_string_data(self):
super(ImageDataRegion, self)._ensure_string_data()
def get_region(self, x, y, width, height):
x += self.x
y += self.y
return super(ImageDataRegion, self).get_region(x, y, width, height)
class CompressedImageData(AbstractImage):
'''Image representing some compressed data suitable for direct uploading
to driver.
'''
_current_texture = None
_current_mipmapped_texture = None
def __init__(self, width, height, gl_format, data,
extension=None, decoder=None):
'''Construct a CompressedImageData with the given compressed data.
:Parameters:
`width` : int
Width of image
`height` : int
Height of image
`gl_format` : int
GL constant giving format of compressed data; for example,
``GL_COMPRESSED_RGBA_S3TC_DXT5_EXT``.
`data` : sequence
String or array/list of bytes giving compressed image data.
`extension` : str or None
If specified, gives the name of a GL extension to check for
before creating a texture.
`decoder` : function(data, width, height) -> AbstractImage
A function to decode the compressed data, to be used if the
required extension is not present.
'''
if not _is_pow2(width) or not _is_pow2(height):
raise ImageException('Dimensions of %r must be powers of 2' % self)
super(CompressedImageData, self).__init__(width, height)
self.data = data
self.gl_format = gl_format
self.extension = extension
self.decoder = decoder
self.mipmap_data = []
def set_mipmap_data(self, level, data):
'''Set data for a mipmap level.
Supplied data gives a compressed image for the given mipmap level.
The image must be of the correct dimensions for the level
(i.e., width >> level, height >> level); but this is not checked. If
any mipmap levels are specified, they are used; otherwise, mipmaps for
`mipmapped_texture` are generated automatically.
:Parameters:
`level` : int
Level of mipmap image to set.
`data` : sequence
String or array/list of bytes giving compressed image data.
Data must be in same format as specified in constructor.
'''
# Extend mipmap_data list to required level
self.mipmap_data += [None] * (level - len(self.mipmap_data))
self.mipmap_data[level - 1] = data
def _have_extension(self):
return self.extension is None or gl_info.have_extension(self.extension)
def _verify_driver_supported(self):
'''Assert that the extension required for this image data is
supported.
Raises `ImageException` if not.
'''
if not self._have_extension():
raise ImageException('%s is required to decode %r' % \
(self.extension, self))
def get_texture(self, rectangle=False):
if self._current_texture:
return self._current_texture
texture = Texture.create_for_size(
GL_TEXTURE_2D, self.width, self.height)
if self.anchor_x or self.anchor_y:
texture.anchor_x = self.anchor_x
texture.anchor_y = self.anchor_y
glBindTexture(texture.target, texture.id)
glTexParameteri(texture.target, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
if self._have_extension():
glCompressedTexImage2DARB(texture.target, texture.level,
self.gl_format,
self.width, self.height, 0,
len(self.data), self.data)
else:
image = self.decoder(self.data, self.width, self.height)
texture = image.get_texture()
assert texture.width == self.width
assert texture.height == self.height
glFlush()
self._current_texture = texture
return texture
def get_mipmapped_texture(self):
if self._current_mipmap_texture:
return self._current_mipmap_texture
if not self._have_extension():
# TODO mip-mapped software decoded compressed textures. For now,
# just return a non-mipmapped texture.
return self.get_texture()
texture = Texture.create_for_size(
GL_TEXTURE_2D, self.width, self.height)
if self.anchor_x or self.anchor_y:
texture.anchor_x = self.anchor_x
texture.anchor_y = self.anchor_y
glBindTexture(texture.target, texture.id)
glTexParameteri(texture.target, GL_TEXTURE_MIN_FILTER,
GL_LINEAR_MIPMAP_LINEAR)
if not self.mipmap_data:
if not gl_info.have_version(1, 4):
raise ImageException(
'Require GL 1.4 to generate mipmaps for compressed textures')
glTexParameteri(texture.target, GL_GENERATE_MIPMAP, GL_TRUE)
glCompressedTexImage2DARB(texture.target, texture.level,
self.gl_format,
self.width, self.height, 0,
len(self.data), self.data)
width, height = self.width, self.height
level = 0
for data in self.mipmap_data:
width >>= 1
height >>= 1
level += 1
glCompressedTexImage2DARB(texture.target, level,
self.gl_format,
width, height, 0,
len(data), data)
glFlush()
self._current_mipmap_texture = texture
return texture
def blit_to_texture(self, target, level, x, y, z):
self._verify_driver_supported()
if target == GL_TEXTURE_3D:
glCompressedTexSubImage3DARB(target, level,
x - self.anchor_x, y - self.anchor_y, z,
self.width, self.height, 1,
self.gl_format,
len(self.data), self.data)
else:
glCompressedTexSubImage2DARB(target, level,
x - self.anchor_x, y - self.anchor_y,
self.width, self.height,
self.gl_format,
len(self.data), self.data)
def _nearest_pow2(v):
# From http://graphics.stanford.edu/~seander/bithacks.html#RoundUpPowerOf2
# Credit: Sean Anderson
v -= 1
v |= v >> 1
v |= v >> 2
v |= v >> 4
v |= v >> 8
v |= v >> 16
return v + 1
def _is_pow2(v):
# http://graphics.stanford.edu/~seander/bithacks.html#DetermineIfPowerOf2
return (v & (v - 1)) == 0
class Texture(AbstractImage):
'''An image loaded into video memory that can be efficiently drawn
to the framebuffer.
Typically you will get an instance of Texture by accessing the `texture`
member of any other AbstractImage.
:Ivariables:
`region_class` : class (subclass of TextureRegion)
Class to use when constructing regions of this texture.
`tex_coords` : tuple
12-tuple of float, named (u1, v1, r1, u2, v2, r2, ...). u, v, r
give the 3D texture coordinates for vertices 1-4. The vertices
are specified in the order bottom-left, bottom-right, top-right
and top-left.
`target` : int
The GL texture target (e.g., ``GL_TEXTURE_2D``).
`level` : int
The mipmap level of this texture.
'''
region_class = None # Set to TextureRegion after it's defined
tex_coords = (0., 0., 0., 1., 0., 0., 1., 1., 0., 0., 1., 0.)
tex_coords_order = (0, 1, 2, 3)
level = 0
images = 1
x = y = z = 0
def __init__(self, width, height, target, id):
super(Texture, self).__init__(width, height)
self.target = target
self.id = id
self._context = gl.current_context
def delete(self):
'''Delete the texture from video memory.
:deprecated: Textures are automatically released during object
finalization.
'''
warnings.warn(
'Texture.delete() is deprecated; textures are '
'released through GC now')
self._context.delete_texture(self.id)
self.id = 0
def __del__(self):
try:
self._context.delete_texture(self.id)
except:
pass
@classmethod
def create(cls, width, height, internalformat=GL_RGBA, rectangle=False):
'''Create an empty Texture.
If `rectangle` is ``False`` or the appropriate driver extensions are
not available, a larger texture than requested will be created, and
a `TextureRegion` corresponding to the requested size will be
returned.
:Parameters:
`width` : int
Width of the texture.
`height` : int
Height of the texture.
`internalformat` : int
GL constant giving the internal format of the texture; for
example, ``GL_RGBA``.
`rectangle` : bool
``True`` if a rectangular texture is permitted. See
`AbstractImage.get_texture`.
:rtype: `Texture`
:since: pyglet 1.1
'''
target = GL_TEXTURE_2D
if rectangle:
if _is_pow2(width) and _is_pow2(height):
rectangle = False
elif gl_info.have_extension('GL_ARB_texture_rectangle'):
target = GL_TEXTURE_RECTANGLE_ARB
elif gl_info.have_extension('GL_NV_texture_rectangle'):
target = GL_TEXTURE_RECTANGLE_NV
else:
rectangle = False
if rectangle:
texture_width = width
texture_height = height
else:
texture_width = _nearest_pow2(width)
texture_height = _nearest_pow2(height)
id = GLuint()
glGenTextures(1, byref(id))
glBindTexture(target, id.value)
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
blank = (GLubyte * (texture_width * texture_height * 4))()
glTexImage2D(target, 0,
internalformat,
texture_width, texture_height,
0,
GL_RGBA, GL_UNSIGNED_BYTE,
blank)
texture = cls(texture_width, texture_height, target, id.value)
if rectangle:
texture.tex_coords = (0., 0., 0.,
width, 0., 0.,
width, height, 0.,
0., height, 0.)
glFlush()
if texture_width == width and texture_height == height:
return texture
return texture.get_region(0, 0, width, height)
@classmethod
def create_for_size(cls, target, min_width, min_height,
internalformat=None):
'''Create a Texture with dimensions at least min_width, min_height.
On return, the texture will be bound.
:Parameters:
`target` : int
GL constant giving texture target to use, typically
``GL_TEXTURE_2D``.
`min_width` : int
Minimum width of texture (may be increased to create a power
of 2).
`min_height` : int
Minimum height of texture (may be increased to create a power
of 2).
`internalformat` : int
GL constant giving internal format of texture; for example,
``GL_RGBA``. If unspecified, the texture will not be
initialised (only the texture name will be created on the
instance). If specified, the image will be initialised
to this format with zero'd data.
:rtype: `Texture`
'''
if target not in (GL_TEXTURE_RECTANGLE_NV, GL_TEXTURE_RECTANGLE_ARB):
width = _nearest_pow2(min_width)
height = _nearest_pow2(min_height)
tex_coords = cls.tex_coords
else:
width = min_width
height = min_height
tex_coords = (0., 0., 0.,
width, 0., 0.,
width, height, 0.,
0., height, 0.)
id = GLuint()
glGenTextures(1, byref(id))
glBindTexture(target, id.value)
glTexParameteri(target, GL_TEXTURE_MIN_FILTER, GL_LINEAR)
if internalformat is not None:
blank = (GLubyte * (width * height * 4))()
glTexImage2D(target, 0,
internalformat,
width, height,
0,
GL_RGBA, GL_UNSIGNED_BYTE,
blank)
glFlush()
texture = cls(width, height, target, id.value)
texture.tex_coords = tex_coords
return texture
def get_image_data(self, z=0):
'''Get the image data of this texture.
Changes to the returned instance will not be reflected in this
texture.
:Parameters:
`z` : int
For 3D textures, the image slice to retrieve.
:rtype: `ImageData`
'''
glBindTexture(self.target, self.id)
# Always extract complete RGBA data. Could check internalformat
# to only extract used channels. XXX
format = 'RGBA'
gl_format = GL_RGBA
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT)
glPixelStorei(GL_PACK_ALIGNMENT, 1)
buffer = \
(GLubyte * (self.width * self.height * self.images * len(format)))()
glGetTexImage(self.target, self.level,
gl_format, GL_UNSIGNED_BYTE, buffer)
glPopClientAttrib()
data = ImageData(self.width, self.height, format, buffer)
if self.images > 1:
data = data.get_region(0, z * self.height, self.width, self.height)
return data
image_data = property(lambda self: self.get_image_data(),
doc='''An ImageData view of this texture.
Changes to the returned instance will not be reflected in this
texture. If the texture is a 3D texture, the first image will be
returned. See also `get_image_data`. Read-only.
:deprecated: Use `get_image_data`.
:type: `ImageData`
''')
def get_texture(self, rectangle=False):
return self
# no implementation of blit_to_texture yet (could use aux buffer)
def blit(self, x, y, z=0, width=None, height=None):
t = self.tex_coords
x1 = x - self.anchor_x
y1 = y - self.anchor_y
x2 = x1 + (width is None and self.width or width)
y2 = y1 + (height is None and self.height or height)
array = (GLfloat * 32)(
t[0], t[1], t[2], 1.,
x1, y1, z, 1.,
t[3], t[4], t[5], 1.,
x2, y1, z, 1.,
t[6], t[7], t[8], 1.,
x2, y2, z, 1.,
t[9], t[10], t[11], 1.,
x1, y2, z, 1.)
glPushAttrib(GL_ENABLE_BIT)
glEnable(self.target)
glBindTexture(self.target, self.id)
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
glInterleavedArrays(GL_T4F_V4F, 0, array)
glDrawArrays(GL_QUADS, 0, 4)
glPopClientAttrib()
glPopAttrib()
def blit_into(self, source, x, y, z):
glBindTexture(self.target, self.id)
source.blit_to_texture(self.target, self.level, x, y, z)
def get_region(self, x, y, width, height):
return self.region_class(x, y, 0, width, height, self)
def get_transform(self, flip_x=False, flip_y=False, rotate=0):
'''Create a copy of this image applying a simple transformation.
The transformation is applied to the texture coordinates only;
`get_image_data` will return the untransformed data. The
transformation is applied around the anchor point.
:Parameters:
`flip_x` : bool
If True, the returned image will be flipped horizontally.
`flip_y` : bool
If True, the returned image will be flipped vertically.
`rotate` : int
Degrees of clockwise rotation of the returned image. Only
90-degree increments are supported.
:rtype: `TextureRegion`
'''
transform = self.get_region(0, 0, self.width, self.height)
bl, br, tr, tl = 0, 1, 2, 3
transform.anchor_x = self.anchor_x
transform.anchor_y = self.anchor_y
if flip_x:
bl, br, tl, tr = br, bl, tr, tl
transform.anchor_x = self.width - self.anchor_x
if flip_y:
bl, br, tl, tr = tl, tr, bl, br
transform.anchor_y = self.height - self.anchor_y
rotate %= 360
if rotate < 0:
rotate += 360
if rotate == 0:
pass
elif rotate == 90:
bl, br, tr, tl = br, tr, tl, bl
transform.anchor_x, transform.anchor_y = \
transform.anchor_y, \
transform.width - transform.anchor_x
elif rotate == 180:
bl, br, tr, tl = tr, tl, bl, br
transform.anchor_x = transform.width - transform.anchor_x
transform.anchor_y = transform.height - transform.anchor_y
elif rotate == 270:
bl, br, tr, tl = tl, bl, br, tr
transform.anchor_x, transform.anchor_y = \
transform.height - transform.anchor_y, \
transform.anchor_x
else:
assert False, 'Only 90 degree rotations are supported.'
if rotate in (90, 270):
transform.width, transform.height = \
transform.height, transform.width
transform._set_tex_coords_order(bl, br, tr, tl)
return transform
def _set_tex_coords_order(self, bl, br, tr, tl):
tex_coords = (self.tex_coords[:3],
self.tex_coords[3:6],
self.tex_coords[6:9],
self.tex_coords[9:])
self.tex_coords = \
tex_coords[bl] + tex_coords[br] + tex_coords[tr] + tex_coords[tl]
order = self.tex_coords_order
self.tex_coords_order = \
(order[bl], order[br], order[tr], order[tl])
class TextureRegion(Texture):
'''A rectangular region of a texture, presented as if it were
a separate texture.
'''
def __init__(self, x, y, z, width, height, owner):
super(TextureRegion, self).__init__(
width, height, owner.target, owner.id)
self.x = x
self.y = y
self.z = z
self.owner = owner
owner_u1 = owner.tex_coords[0]
owner_v1 = owner.tex_coords[1]
owner_u2 = owner.tex_coords[3]
owner_v2 = owner.tex_coords[7]
scale_u = owner_u2 - owner_u1
scale_v = owner_v2 - owner_v1
u1 = x / float(owner.width) * scale_u + owner_u1
v1 = y / float(owner.height) * scale_v + owner_v1
u2 = (x + width) / float(owner.width) * scale_u + owner_u1
v2 = (y + height) / float(owner.height) * scale_v + owner_v1
r = z / float(owner.images) + owner.tex_coords[2]
self.tex_coords = (u1, v1, r, u2, v1, r, u2, v2, r, u1, v2, r)
def get_image_data(self):
image_data = self.owner.get_image_data(self.z)
return image_data.get_region(self.x, self.y, self.width, self.height)
def get_region(self, x, y, width, height):
x += self.x
y += self.y
region = self.region_class(x, y, self.z, width, height, self.owner)
region._set_tex_coords_order(*self.tex_coords_order)
return region
def blit_into(self, source, x, y, z):
self.owner.blit_into(source, x + self.x, y + self.y, z + self.z)
def __del__(self):
# only the owner Texture should handle deletion
pass
Texture.region_class = TextureRegion
class Texture3D(Texture, UniformTextureSequence):
'''A texture with more than one image slice.
Use `create_for_images` or `create_for_image_grid` classmethod to
construct.
'''
item_width = 0
item_height = 0
items = ()
@classmethod
def create_for_images(cls, images, internalformat=GL_RGBA):
item_width = images[0].width
item_height = images[0].height
for image in images:
if image.width != item_width or image.height != item_height:
raise ImageException('Images do not have same dimensions.')
depth = len(images)
if not gl_info.have_version(2,0):
depth = _nearest_pow2(depth)
texture = cls.create_for_size(GL_TEXTURE_3D, item_width, item_height)
if images[0].anchor_x or images[0].anchor_y:
texture.anchor_x = self.anchor_x
texture.anchor_y = self.anchor_y
texture.images = depth
blank = (GLubyte * (texture.width * texture.height * texture.images))()
glBindTexture(texture.target, texture.id)
glTexImage3D(texture.target, texture.level,
internalformat,
texture.width, texture.height, texture.images, 0,
GL_ALPHA, GL_UNSIGNED_BYTE,
blank)
items = []
for i, image in enumerate(images):
item = cls.region_class(0, 0, i, item_width, item_height, texture)
items.append(item)
image.blit_to_texture(texture.target, texture.level,
image.anchor_x, image.anchor_y, i)
glFlush()
texture.items = items
texture.item_width = item_width
texture.item_height = item_height
return texture
@classmethod
def create_for_image_grid(cls, grid, internalformat=GL_RGBA):
return cls.create_for_images(grid[:], internalformat)
def __len__(self):
return len(self.items)
def __getitem__(self, index):
return self.items[index]
def __setitem__(self, index, value):
if type(index) is slice:
for item, image in zip(self[index], value):
image.blit_to_texture(self.target, self.level,
image.anchor_x, image.anchor_y, item.z)
else:
value.blit_to_texture(self.target, self.level,
value.anchor_x, value.anchor_y, self[index].z)
def __iter__(self):
return iter(self.items)
class TileableTexture(Texture):
'''A texture that can be tiled efficiently.
Use `create_for_image` classmethod to construct.
'''
def __init__(self, width, height, target, id):
if not _is_pow2(width) or not _is_pow2(height):
raise ImageException(
'TileableTexture requires dimensions that are powers of 2')
super(TileableTexture, self).__init__(width, height, target, id)
def get_region(self, x, y, width, height):
raise ImageException('Cannot get region of %r' % self)
def blit_tiled(self, x, y, z, width, height):
'''Blit this texture tiled over the given area.
The image will be tiled with the bottom-left corner of the destination
rectangle aligned with the anchor point of this texture.
'''
u1 = self.anchor_x / float(self.width)
v1 = self.anchor_y / float(self.height)
u2 = u1 + width / float(self.width)
v2 = v1 + height / float(self.height)
w, h = width, height
t = self.tex_coords
array = (GLfloat * 32)(
u1, v1, t[2], 1.,
x, y, z, 1.,
u2, v1, t[5], 1.,
x + w, y, z, 1.,
u2, v2, t[8], 1.,
x + w, y + h, z, 1.,
u1, v2, t[11], 1.,
x, y + h, z, 1.)
glPushAttrib(GL_ENABLE_BIT)
glEnable(self.target)
glBindTexture(self.target, self.id)
glPushClientAttrib(GL_CLIENT_VERTEX_ARRAY_BIT)
glInterleavedArrays(GL_T4F_V4F, 0, array)
glDrawArrays(GL_QUADS, 0, 4)
glPopClientAttrib()
glPopAttrib()
@classmethod
def create_for_image(cls, image):
if not _is_pow2(image.width) or not _is_pow2(image.height):
# Potentially unnecessary conversion if a GL format exists.
image = image.get_image_data()
texture_width = _nearest_pow2(image.width)
texture_height = _nearest_pow2(image.height)
newdata = c_buffer(texture_width * texture_height * 4)
gluScaleImage(GL_RGBA,
image.width, image.height,
GL_UNSIGNED_BYTE,
image.get_data('RGBA', image.width * 4),
texture_width,
texture_height,
GL_UNSIGNED_BYTE,
newdata)
image = ImageData(texture_width, texture_height, image.format,
newdata)
image = image.get_image_data()
return image.create_texture(cls)
class DepthTexture(Texture):
'''A texture with depth samples (typically 24-bit).'''
def blit_into(self, source, x, y, z):
glBindTexture(self.target, self.id)
source.blit_to_texture(self.level, x, y, z)
class BufferManager(object):
'''Manages the set of framebuffers for a context.
Use `get_buffer_manager` to obtain the instance of this class for the
current context.
'''
def __init__(self):
self.color_buffer = None
self.depth_buffer = None
aux_buffers = GLint()
glGetIntegerv(GL_AUX_BUFFERS, byref(aux_buffers))
self.free_aux_buffers = [GL_AUX0,
GL_AUX1,
GL_AUX2,
GL_AUX3][:aux_buffers.value]
stencil_bits = GLint()
glGetIntegerv(GL_STENCIL_BITS, byref(stencil_bits))
self.free_stencil_bits = range(stencil_bits.value)
self.refs = []
def get_viewport(self):
'''Get the current OpenGL viewport dimensions.
:rtype: 4-tuple of float.
:return: Left, top, right and bottom dimensions.
'''
viewport = (GLint * 4)()
glGetIntegerv(GL_VIEWPORT, viewport)
return viewport
def get_color_buffer(self):
'''Get the color buffer.
:rtype: `ColorBufferImage`
'''
viewport = self.get_viewport()
viewport_width = viewport[2]
viewport_height = viewport[3]
if (not self.color_buffer or
viewport_width != self.color_buffer.width or
viewport_height != self.color_buffer.height):
self.color_buffer = ColorBufferImage(*viewport)
return self.color_buffer
def get_aux_buffer(self):
'''Get a free auxilliary buffer.
If not aux buffers are available, `ImageException` is raised. Buffers
are released when they are garbage collected.
:rtype: `ColorBufferImage`
'''
if not self.free_aux_buffers:
raise ImageException('No free aux buffer is available.')
gl_buffer = self.free_aux_buffers.pop(0)
viewport = self.get_viewport()
buffer = ColorBufferImage(*viewport)
buffer.gl_buffer = gl_buffer
def release_buffer(ref, self=self):
self.free_aux_buffers.insert(0, gl_buffer)
self.refs.append(weakref.ref(buffer, release_buffer))
return buffer
def get_depth_buffer(self):
'''Get the depth buffer.
:rtype: `DepthBufferImage`
'''
viewport = self.get_viewport()
viewport_width = viewport[2]
viewport_height = viewport[3]
if (not self.depth_buffer or
viewport_width != self.depth_buffer.width or
viewport_height != self.depth_buffer.height):
self.depth_buffer = DepthBufferImage(*viewport)
return self.depth_buffer
def get_buffer_mask(self):
'''Get a free bitmask buffer.
A bitmask buffer is a buffer referencing a single bit in the stencil
buffer. If no bits are free, `ImageException` is raised. Bits are
released when the bitmask buffer is garbage collected.
:rtype: `BufferImageMask`
'''
if not self.free_stencil_bits:
raise ImageException('No free stencil bits are available.')
stencil_bit = self.free_stencil_bits.pop(0)
viewport = self.get_viewport()
buffer = BufferImageMask(x, y, width, height)
buffer.stencil_bit = stencil_bit
def release_buffer(ref, self=self):
self.free_stencil_bits.insert(0, stencil_bit)
self.refs.append(weakref.ref(buffer, release_buffer))
return buffer
def get_buffer_manager():
'''Get the buffer manager for the current OpenGL context.
:rtype: `BufferManager`
'''
context = gl.current_context
if not hasattr(context, 'image_buffer_manager'):
context.image_buffer_manager = BufferManager()
return context.image_buffer_manager
# XXX BufferImage could be generalised to support EXT_framebuffer_object's
# renderbuffer.
class BufferImage(AbstractImage):
'''An abstract framebuffer.
'''
#: The OpenGL read and write target for this buffer.
gl_buffer = GL_BACK
#: The OpenGL format constant for image data.
gl_format = 0
#: The format string used for image data.
format = ''
owner = None
# TODO: enable methods
def __init__(self, x, y, width, height):
self.x = x
self.y = y
self.width = width
self.height = height
def get_image_data(self):
buffer = (GLubyte * (len(self.format) * self.width * self.height))()
x = self.x
y = self.y
if self.owner:
x += self.owner.x
y += self.owner.y
glReadBuffer(self.gl_buffer)
glPushClientAttrib(GL_CLIENT_PIXEL_STORE_BIT)
glPixelStorei(GL_PACK_ALIGNMENT, 1)
glReadPixels(x, y, self.width, self.height,
self.gl_format, GL_UNSIGNED_BYTE, buffer)
glPopClientAttrib()
return ImageData(self.width, self.height, self.format, buffer)
def get_region(self, x, y, width, height):
if self.owner:
return self.owner.get_region(x + self.x, y + self.y, width, height)
region = self.__class__(x + self.x, y + self.y, width, height)
region.gl_buffer = self.gl_buffer
region.owner = self
return region
class ColorBufferImage(BufferImage):
'''A color framebuffer.
This class is used to wrap both the primary color buffer (i.e., the back
buffer) or any one of the auxilliary buffers.
'''
gl_format = GL_RGBA
format = 'RGBA'
def get_texture(self, rectangle=False):
texture = Texture.create(self.width, self.height, GL_RGBA, rectangle)
self.blit_to_texture(texture.target, texture.level,
self.anchor_x, self.anchor_y, 0)
return texture
def blit_to_texture(self, target, level, x, y, z):
glReadBuffer(self.gl_buffer)
glCopyTexSubImage2D(target, level,
x - self.anchor_x, y - self.anchor_y,
self.x, self.y, self.width, self.height)
class DepthBufferImage(BufferImage):
'''The depth buffer.
'''
gl_format = GL_DEPTH_COMPONENT
format = 'L'
def get_texture(self, rectangle=False):
assert rectangle == False, \
'Depth textures cannot be rectangular'
if not _is_pow2(self.width) or not _is_pow2(self.height):
raise ImageException(
'Depth texture requires that buffer dimensions be powers of 2')
texture = DepthTexture.create_for_size(GL_TEXTURE_2D,
self.width, self.height)
if self.anchor_x or self.anchor_y:
texture.anchor_x = self.anchor_x
texture.anchor_y = self.anchor_y
glReadBuffer(self.gl_buffer)
glCopyTexImage2D(texture.target, 0,
GL_DEPTH_COMPONENT,
self.x, self.y, self.width, self.height,
0)
return texture
def blit_to_texture(self, target, level, x, y, z):
glReadBuffer(self.gl_buffer)
glCopyTexSubImage2D(target, level,
x - self.anchor_x, y - self.anchor_y,
self.x, self.y, self.width, self.height)
class BufferImageMask(BufferImage):
'''A single bit of the stencil buffer.
'''
gl_format = GL_STENCIL_INDEX
format = 'L'
# TODO mask methods
class ImageGrid(AbstractImage, AbstractImageSequence):
'''An imaginary grid placed over an image allowing easy access to
regular regions of that image.
The grid can be accessed either as a complete image, or as a sequence
of images. The most useful applications are to access the grid
as a `TextureGrid`::
image_grid = ImageGrid(...)
texture_grid = image_grid.get_texture_sequence()
or as a `Texture3D`::
image_grid = ImageGrid(...)
texture_3d = Texture3D.create_for_image_grid(image_grid)
'''
_items = ()
_texture_grid = None
def __init__(self, image, rows, columns,
item_width=None, item_height=None,
row_padding=0, column_padding=0):
'''Construct a grid for the given image.
You can specify parameters for the grid, for example setting
the padding between cells. Grids are always aligned to the
bottom-left corner of the image.
:Parameters:
`image` : AbstractImage
Image over which to construct the grid.
`rows` : int
Number of rows in the grid.
`columns` : int
Number of columns in the grid.
`item_width` : int
Width of each column. If unspecified, is calculated such
that the entire image width is used.
`item_height` : int
Height of each row. If unspecified, is calculated such that
the entire image height is used.
`row_padding` : int
Pixels separating adjacent rows. The padding is only
inserted between rows, not at the edges of the grid.
`column_padding` : int
Pixels separating adjacent columns. The padding is only
inserted between columns, not at the edges of the grid.
'''
super(ImageGrid, self).__init__(image.width, image.height)
if item_width is None:
item_width = \
int((image.width - column_padding * (columns - 1)) / columns)
if item_height is None:
item_height = \
int((image.height - row_padding * (rows - 1)) / rows)
self.image = image
self.rows = rows
self.columns = columns
self.item_width = item_width
self.item_height = item_height
self.row_padding = row_padding
self.column_padding = column_padding
def get_texture(self, rectangle=False):
return self.image.get_texture(rectangle)
def get_image_data(self):
return self.image.get_image_data()
def get_texture_sequence(self):
if not self._texture_grid:
self._texture_grid = TextureGrid(self)
return self._texture_grid
def __len__(self):
return self.rows * self.columns
def _update_items(self):
if not self._items:
self._items = []
y = 0
for row in range(self.rows):
x = 0
for col in range(self.columns):
self._items.append(self.image.get_region(
x, y, self.item_width, self.item_height))
x += self.item_width + self.column_padding
y += self.item_height + self.row_padding
def __getitem__(self, index):
self._update_items()
# TODO tuples
return self._items[index]
def __iter__(self):
self._update_items()
return iter(self._items)
class TextureGrid(TextureRegion, UniformTextureSequence):
'''A texture containing a regular grid of texture regions.
To construct, create an `ImageGrid` first::
image_grid = ImageGrid(...)
texture_grid = TextureGrid(image_grid)
The texture grid can be accessed as a single texture, or as a sequence
of `TextureRegion`. When accessing as a sequence, you can specify
integer indexes, in which the images are arranged in rows from the
bottom-left to the top-right::
# assume the texture_grid is 3x3:
current_texture = texture_grid[3] # get the middle-left image
You can also specify tuples in the sequence methods, which are addressed
as ``row, column``::
# equivalent to the previous example:
current_texture = texture_grid[1, 0]
When using tuples in a slice, the returned sequence is over the
rectangular region defined by the slice::
# returns center, center-right, center-top, top-right images in that
# order:
images = texture_grid[(1,1):]
# equivalent to
images = texture_grid[(1,1):(3,3)]
'''
items = ()
rows = 1
columns = 1
item_width = 0
item_height = 0
def __init__(self, grid):
image = grid.get_texture()
if isinstance(image, TextureRegion):
owner = image.owner
else:
owner = image
super(TextureGrid, self).__init__(
image.x, image.y, image.z, image.width, image.height, owner)
items = []
y = 0
for row in range(grid.rows):
x = 0
for col in range(grid.columns):
items.append(
self.get_region(x, y, grid.item_width, grid.item_height))
x += grid.item_width + grid.column_padding
y += grid.item_height + grid.row_padding
self.items = items
self.rows = grid.rows
self.columns = grid.columns
self.item_width = grid.item_width
self.item_height = grid.item_height
def get(self, row, column):
return self[(row, column)]
def __getitem__(self, index):
if type(index) is slice:
if type(index.start) is not tuple and \
type(index.stop) is not tuple:
return self.items[index]
else:
row1 = 0
col1 = 0
row2 = self.rows
col2 = self.columns
if type(index.start) is tuple:
row1, col1 = index.start
elif type(index.start) is int:
row1 = index.start / self.columns
col1 = index.start % self.columns
assert row1 >= 0 and col1 >= 0 and \
row1 < self.rows and col1 < self.columns
if type(index.stop) is tuple:
row2, col2 = index.stop
elif type(index.stop) is int:
row2 = index.stop / self.columns
col2 = index.stop % self.columns
assert row2 >= 0 and col2 >= 0 and \
row2 <= self.rows and col2 <= self.columns
result = []
i = row1 * self.columns
for row in range(row1, row2):
result += self.items[i+col1:i+col2]
i += self.columns
return result
else:
if type(index) is tuple:
row, column = index
assert row >= 0 and column >= 0 and \
row < self.rows and column < self.columns
return self.items[row * self.columns + column]
elif type(index) is int:
return self.items[index]
def __setitem__(self, index, value):
if type(index) is slice:
for region, image in zip(self[index], value):
if image.width != self.item_width or \
image.height != self.item_height:
raise ImageException('Image has incorrect dimensions')
image.blit_into(region, image.anchor_x, image.anchor_y, 0)
else:
image = value
if image.width != self.item_width or \
image.height != self.item_height:
raise ImageException('Image has incorrect dimensions')
image.blit_into(self[index], image.anchor_x, image.anchor_y, 0)
def __len__(self):
return len(self.items)
def __iter__(self):
return iter(self.items)
# --------------------------------------------------------------------------
# Animation stuff here. Vote on if this should be in pyglet.image.animation
# or just leave it tacked on here.
# TODO:
# conversion Animation -> media.Source
# move to another module?
# pyglet.animation?
# pyglet.image.animation?
def load_animation(filename, file=None, decoder=None):
'''Load an animation from a file.
Currently, the only supported format is GIF.
:Parameters:
`filename` : str
Used to guess the animation format, and to load the file if `file`
is unspecified.
`file` : file-like object or None
File object containing the animation stream.
`decoder` : ImageDecoder or None
If unspecified, all decoders that are registered for the filename
extension are tried. If none succeed, the exception from the
first decoder is raised.
:rtype: Animation
'''
if not file:
file = open(filename, 'rb')
if not hasattr(file, 'seek'):
file = StringIO(file.read())
if decoder:
return decoder.decode(file, filename)
else:
first_exception = None
for decoder in codecs.get_animation_decoders(filename):
try:
image = decoder.decode_animation(file, filename)
return image
except codecs.ImageDecodeException, e:
first_exception = first_exception or e
file.seek(0)
if not first_exception:
raise codecs.ImageDecodeException('No image decoders are available')
raise first_exception
class Animation(object):
'''Sequence of images with timing information.
If no frames of the animation have a duration of ``None``, the animation
loops continuously; otherwise the animation stops at the first frame with
duration of ``None``.
:Ivariables:
`frames` : list of `AnimationFrame`
The frames that make up the animation.
'''
def __init__(self, frames):
'''Create an animation directly from a list of frames.
:Parameters:
`frames` : list of `AnimationFrame`
The frames that make up the animation.
'''
assert len(frames)
self.frames = frames
def add_to_texture_bin(self, bin):
'''Add the images of the animation to a `TextureBin`.
The animation frames are modified in-place to refer to the texture bin
regions.
:Parameters:
`bin` : `TextureBin`
Texture bin to upload animation frames into.
'''
for frame in self.frames:
frame.image = bin.add(frame.image)
def get_transform(self, flip_x=False, flip_y=False, rotate=0):
'''Create a copy of this animation applying a simple transformation.
The transformation is applied around the image's anchor point of
each frame. The texture data is shared between the original animation
and the transformed animation.
:Parameters:
`flip_x` : bool
If True, the returned animation will be flipped horizontally.
`flip_y` : bool
If True, the returned animation will be flipped vertically.
`rotate` : int
Degrees of clockwise rotation of the returned animation. Only
90-degree increments are supported.
:rtype: `Animation`
'''
frames = [AnimationFrame(
frame.image.get_texture().get_transform(
flip_x, flip_y, rotate), frame.duration) \
for frame in self.frames]
return Animation(frames)
def get_duration(self):
'''Get the total duration of the animation in seconds.
:rtype: float
'''
return sum([frame.duration for frame in self.frames \
if frame.duration is not None])
def get_max_width(self):
'''Get the maximum image frame width.
This method is useful for determining texture space requirements: due
to the use of ``anchor_x`` the actual required playback area may be
larger.
:rtype: int
'''
return max([frame.image.width for frame in self.frames])
def get_max_height(self):
'''Get the maximum image frame height.
This method is useful for determining texture space requirements: due
to the use of ``anchor_y`` the actual required playback area may be
larger.
:rtype: int
'''
return max([frame.image.height for frame in self.frames])
@classmethod
def from_image_sequence(cls, sequence, period, loop=True):
'''Create an animation from a list of images and a constant framerate.
:Parameters:
`sequence` : list of `AbstractImage`
Images that make up the animation, in sequence.
`period` : float
Number of seconds to display each image.
`loop` : bool
If True, the animation will loop continuously.
:rtype: `Animation`
'''
frames = [AnimationFrame(image, period) for image in sequence]
if not loop:
frames[-1].duration = None
return cls(frames)
class AnimationFrame(object):
'''A single frame of an animation.
'''
def __init__(self, image, duration):
'''Create an animation frame from an image.
:Parameters:
`image` : `AbstractImage`
The image of this frame.
`duration` : float
Number of seconds to display the frame, or ``None`` if it is
the last frame in the animation.
'''
self.image = image
self.duration = duration
def __repr__(self):
return 'AnimationFrame(%r, %r)' % (self.image, self.duration)
# Initialise default codecs
from pyglet.image import codecs as _codecs
_codecs.add_default_image_codecs()
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