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@@ -38,6 +38,7 @@ install_requires = | |
pyserial | ||
tqdm | ||
freetype-py | ||
construct | ||
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[options.packages.find] | ||
exclude = | ||
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import argparse | ||
import base64 | ||
import tempfile | ||
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import argparse | ||
import tempfile | ||
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import pytest | ||
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import argparse | ||
import base64 | ||
import pathlib | ||
import tempfile | ||
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import math | ||
import binascii | ||
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from construct import (Array, Bytes, Checksum, Computed, Const, Int8ul, | ||
Int16ul, Int32ul, Optional, PaddedString, Prefixed, | ||
PrefixedArray, RawCopy, Struct, Adapter, Rebuild, | ||
this, len_) | ||
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def compute_bit_length(ctx): | ||
"""Compute the required bit length for image data. | ||
Uses the count of items in the palette to determine how | ||
densely we can pack the image data. | ||
""" | ||
if ctx.type == "RW": | ||
return 8 | ||
else: | ||
return max(1, (ctx.palette_entries - 1).bit_length()) | ||
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def compute_data_length(ctx): | ||
"""Compute the required data length for palette based images. | ||
We need this computation here so we can use `math.ceil` and | ||
byte-align the result. | ||
""" | ||
return math.ceil((ctx.width * ctx.height * ctx.bit_length) / 8) | ||
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class PaletteCountAdapter(Adapter): | ||
def _decode(self, obj, context, path): | ||
if obj == 0: | ||
obj = 256 | ||
return obj | ||
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def _encode(self, obj, context, path): | ||
if obj == 256: | ||
obj = 0 | ||
return obj | ||
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struct_blit_pixel = Struct( | ||
'r' / Int8ul, | ||
'g' / Int8ul, | ||
'b' / Int8ul, | ||
'a' / Int8ul | ||
) | ||
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struct_blit_image = Struct( | ||
'header' / Const(b'SPRITE'), | ||
'type' / PaddedString(2, 'ASCII'), | ||
'size' / Rebuild(Int32ul, len_(this.data) + (this.palette_entries * 4) + 18), | ||
'width' / Int16ul, | ||
'height' / Int16ul, | ||
'format' / Const(0x02, Int8ul), | ||
'palette_entries' / PaletteCountAdapter(Int8ul), | ||
'palette' / Array(this.palette_entries, struct_blit_pixel), | ||
'bit_length' / Computed(compute_bit_length), | ||
'data_length' / Computed(compute_data_length), | ||
'data' / Array(this.data_length, Int8ul) | ||
) | ||
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struct_blit_meta = Struct( | ||
'header' / Const(b'BLITMETA'), | ||
'data' / Prefixed(Int16ul, Struct( | ||
'checksum' / Checksum( | ||
Int32ul, | ||
lambda data: binascii.crc32(data), | ||
this._._.bin.data | ||
), | ||
'date' / PaddedString(16, 'ascii'), | ||
'title' / PaddedString(25, 'ascii'), | ||
'description' / PaddedString(129, 'ascii'), | ||
'version' / PaddedString(17, 'ascii'), | ||
'author' / PaddedString(17, 'ascii'), | ||
'icon' / struct_blit_image, | ||
'splash' / struct_blit_image | ||
)) | ||
) | ||
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struct_blit_bin = Struct( | ||
'header' / Const(b'BLIT'), | ||
'render' / Int32ul, | ||
'update' / Int32ul, | ||
'init' / Int32ul, | ||
'length' / Int32ul, | ||
# The length above is actually the _flash_end symbol from startup_user.s | ||
# it includes the offset into 0x90000000 (external flash) | ||
# we mask out the highest nibble to correct this into the actual bin length | ||
# plus subtract 20 bytes for header, symbol and length dwords | ||
'bin' / Bytes((this.length & 0x0FFFFFFF) - 20) | ||
) | ||
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struct_blit_relo = Struct( | ||
'header' / Const(b'RELO'), | ||
'relocs' / PrefixedArray(Int32ul, Struct( | ||
'reloc' / Int32ul | ||
)) | ||
) | ||
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blit_game = Struct( | ||
'relo' / Optional(struct_blit_relo), | ||
'bin' / RawCopy(struct_blit_bin), | ||
'meta' / Optional(struct_blit_meta) | ||
) | ||
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blit_game_with_meta = Struct( | ||
'relo' / Optional(struct_blit_relo), | ||
'bin' / RawCopy(struct_blit_bin), | ||
'meta' / struct_blit_meta | ||
) | ||
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blit_game_with_meta_and_relo = Struct( | ||
'relo' / struct_blit_relo, | ||
'bin' / RawCopy(struct_blit_bin), | ||
'meta' / struct_blit_meta | ||
) |
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