234 lines
7.9 KiB
Python
234 lines
7.9 KiB
Python
# ----------------------------------------------------------------------------
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# pyglet
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# Copyright (c) 2006-2008 Alex Holkner
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# Copyright (c) 2008-2021 pyglet contributors
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# All rights reserved.
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#
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# Redistribution and use in source and binary forms, with or without
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# modification, are permitted provided that the following conditions
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# are met:
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#
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# * Redistributions of source code must retain the above copyright
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# notice, this list of conditions and the following disclaimer.
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# * Redistributions in binary form must reproduce the above copyright
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# notice, this list of conditions and the following disclaimer in
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# the documentation and/or other materials provided with the
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# distribution.
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# * Neither the name of pyglet nor the names of its
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# contributors may be used to endorse or promote products
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# derived from this software without specific prior written
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# permission.
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#
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# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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# FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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# COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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# INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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# BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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# LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
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# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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# ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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# POSSIBILITY OF SUCH DAMAGE.
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# ----------------------------------------------------------------------------
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"""Draw a NinePatch image.
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NinePatch is a format for storing how to cut up a 9-part resizable
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rectangular image within the image pixel data directly.
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For more information on the NinePatch format, see
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http://developer.android.com/guide/topics/graphics/2d-graphics.html#nine-patch.
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"""
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from pyglet.graphics import OrderedGroup
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from pyglet.gl import GL_BLEND, GL_ENABLE_BIT, GL_ONE_MINUS_SRC_ALPHA, GL_SRC_ALPHA
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from pyglet.gl import glBindTexture, glBlendFunc, glEnable, glPopAttrib, glPushAttrib
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class NinePatchException(Exception):
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pass
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class NinePatchGroup(OrderedGroup):
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def __init__(self, texture, order=0, parent=None):
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super().__init__(order, parent)
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self.texture = texture
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def set_state(self):
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glPushAttrib(GL_ENABLE_BIT)
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glEnable(GL_BLEND)
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glBlendFunc(GL_SRC_ALPHA, GL_ONE_MINUS_SRC_ALPHA)
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glEnable(self.texture.target)
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glBindTexture(self.texture.target, self.texture.id)
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def unset_state(self):
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glPopAttrib()
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class _PixelData:
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def __init__(self, image):
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image_data = image.get_image_data()
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self.has_alpha = 'A' in image_data.format
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self.data = image_data.get_data("RGBA", image.width * 4)
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self.width = image.width
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self.height = image.height
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def is_black(self, x, y):
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p = (y * self.width + x) * 4
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if self.has_alpha:
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if self.data[p + 3] == 0:
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return False # Fully transparent
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return self.data[p:p + 3] == b'\x00\x00\x00'
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class NinePatch:
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"""A scalable 9-patch image.
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"""
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# Content area of the image, in pixels from the edge.
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_padding_top = 0
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_padding_bottom = 0
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_padding_right = 0
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_padding_left = 0
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# Resizable area of the image, in pixels from the closest edge
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_stretch_top = 0
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_stretch_left = 0
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_stretch_right = 0
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_stretch_bottom = 0
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def __init__(self, image):
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"""Create NinePatch cuts of an image
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Arguments:
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image - an ImageData (Texture, TextureRegion, etc)
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texture - force cut ImageDatas to be Textures (or Regions)
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"""
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pixel_data = _PixelData(image)
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width = image.width
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height = pixel_data.height
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# Texture dimensions after removing the 9patch outline.
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self.width = width - 2
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self.height = height - 2
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# Find stretch area markers
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for x in range(1, width - 1):
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if pixel_data.is_black(x, height - 1):
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self._stretch_left = x
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break
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else:
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self._stretch_left = 1
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for x in range(width - 2, 0, -1):
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if pixel_data.is_black(x, height - 1):
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self._stretch_right = width - x
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break
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else:
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self._stretch_right = 1
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for y in range(1, height - 1):
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if pixel_data.is_black(0, y):
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self._stretch_bottom = y
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break
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else:
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self._stretch_bottom = 1
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for y in range(height - 2, 0, -1):
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if pixel_data.is_black(0, y):
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self._stretch_top = height - y
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break
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else:
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self._stretch_top = 1
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# Find content area markers, if any
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for x in range(1, width - 1):
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if pixel_data.is_black(x, 0):
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self._padding_left = x - 1
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break
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for x in range(width - 2, 0, -1):
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if pixel_data.is_black(x, 0):
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self._padding_right = self.width - x
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break
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for y in range(1, height - 1):
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if pixel_data.is_black(width - 1, y):
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self._padding_bottom = y - 1
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break
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for y in range(height - 2, 0, -1):
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if pixel_data.is_black(width - 1, y):
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self._padding_top = self.height - y
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break
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# Texture coordinates, in pixels
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u1 = 1
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v1 = 1
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u2 = self._stretch_left + 1
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v2 = self._stretch_bottom + 1
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u3 = width - self._stretch_right - 1
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v3 = height - self._stretch_top - 1
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u4 = width - 1
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v4 = height - 1
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# Texture coordinates as ratio of image size (0 to 1)
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u1, u2, u3, u4 = [s / width for s in (u1, u2, u3, u4)]
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v1, v2, v3, v4 = [s / height for s in (v1, v2, v3, v4)]
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# Scale texture coordinates to match the tex_coords pyglet gives us
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# (these aren't necessarily 0-1 as the texture may have been packed)
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(tu1, tv1, ___,
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___, ___, ___,
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tu2, tv2, ___,
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___, ___, ___) = image.get_texture().tex_coords
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u_scale = tu2 - tu1
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u_bias = tu1
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v_scale = tv2 - tv1
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v_bias = tv1
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u1, u2, u3, u4 = [u_bias + u_scale * s for s in (u1, u2, u3, u4)]
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v1, v2, v3, v4 = [v_bias + v_scale * s for s in (v1, v2, v3, v4)]
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# 2D texture coordinates, bottom-left to top-right
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self.tex_coords = (u1, v1, u2, v1, u3, v1, u4, v1,
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u1, v2, u2, v2, u3, v2, u4, v2,
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u1, v3, u2, v3, u3, v3, u4, v3,
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u1, v4, u2, v4, u3, v4, u4, v4)
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# Quad indices
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self.indices = []
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for y in range(3):
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for x in range(3):
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self.indices.extend([x + y * 4, (x + 1) + y * 4, (x + 1) + (y + 1) * 4, x + (y + 1) * 4])
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def get_vertices(self, x, y, width, height):
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"""Get 16 2D vertices for the given image region"""
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x = int(x)
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y = int(y)
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if width < self.width + 2 or height < self.height + 2:
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raise NinePatchException("Requested size is smaller than the image.")
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width = int(width)
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height = int(height)
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x1 = x
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y1 = y
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x2 = x + self._stretch_left
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y2 = y + self._stretch_bottom
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x3 = x + width - self._stretch_right
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y3 = y + height - self._stretch_top
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x4 = x + width
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y4 = y + height
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# To match tex coords, vertices are bottom-left to top-right
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return (x1, y1, x2, y1, x3, y1, x4, y1,
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x1, y2, x2, y2, x3, y2, x4, y2,
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x1, y3, x2, y3, x3, y3, x4, y3,
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x1, y4, x2, y4, x3, y4, x4, y4)
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