51 lines
2.0 KiB
Cython
51 lines
2.0 KiB
Cython
# Copyright 2010 Hardcoded Software (http://www.hardcoded.net)
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#
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# This software is licensed under the "HS" License as described in the "LICENSE" file,
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# which should be included with this package. The terms are also available at
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# http://www.hardcoded.net/licenses/hs_license
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cdef object getblock(object image):
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cdef int width, height, pixel_count, red, green, blue, i, offset, bytes_per_line
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cdef char *s
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cdef unsigned char r, g, b
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width = image.width()
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height = image.height()
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if width:
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pixel_count = width * height
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red = green = blue = 0
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bytes_per_line = image.bytesPerLine()
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tmp = image.bits().asstring(image.numBytes())
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s = tmp
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# Qt aligns all its lines on 32bit, which means that if the number of bytes per
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# line for image is not divisible by 4, there's going to be crap inserted in "s"
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# We have to take this into account when calculating offsets
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for i in range(height):
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for j in range(width):
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offset = i * bytes_per_line + j * 3
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r = s[offset]
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g = s[offset + 1]
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b = s[offset + 2]
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red += r
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green += g
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blue += b
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return (red // pixel_count, green // pixel_count, blue // pixel_count)
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else:
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return (0, 0, 0)
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def getblocks(image, int block_count_per_side):
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cdef int width, height, block_width, block_height, ih, iw, top, left
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width = image.width()
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height = image.height()
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if not width:
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return []
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block_width = max(width // block_count_per_side, 1)
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block_height = max(height // block_count_per_side, 1)
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result = []
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for ih in range(block_count_per_side):
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top = min(ih*block_height, height-block_height-1)
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for iw in range(block_count_per_side):
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left = min(iw*block_width, width-block_width-1)
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crop = image.copy(left, top, block_width, block_height)
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result.append(getblock(crop))
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return result
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