84 lines
2.3 KiB
Python
84 lines
2.3 KiB
Python
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# Copyright 2017 Google Inc.
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#
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# Use of this source code is governed by a BSD-style license that can be
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# found in the LICENSE file.
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"""
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Visualize bitmaps in gdb.
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(gdb) source <path to this file>
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(gdb) sk_bitmap <symbol>
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This should pop up a window with the bitmap displayed.
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Right clicking should bring up a menu, allowing the
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bitmap to be saved to a file.
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"""
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import gdb
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from enum import Enum
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try:
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from PIL import Image
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except ImportError:
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import Image
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class ColorType(Enum):
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unknown = 0
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alpha_8 = 1
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rgb_565 = 2
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argb_4444 = 3
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rgba_8888 = 4
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bgra_8888 = 5
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gray_8 = 6
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rgba_F16 = 7
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class AlphaType(Enum):
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unknown = 0
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opaque = 1
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premul = 2
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unpremul = 3
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class sk_bitmap(gdb.Command):
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"""Displays the content of an SkBitmap image."""
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def __init__(self):
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super(sk_bitmap, self).__init__('sk_bitmap',
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gdb.COMMAND_SUPPORT,
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gdb.COMPLETE_FILENAME)
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def invoke(self, arg, from_tty):
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frame = gdb.selected_frame()
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val = frame.read_var(arg)
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if str(val.type.strip_typedefs()) == 'SkBitmap':
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pixels = val['fPixels']
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row_bytes = val['fRowBytes']
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info = val['fInfo']
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width = info['fWidth']
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height = info['fHeight']
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color_type = info['fColorType']
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alpha_type = info['fAlphaType']
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process = gdb.selected_inferior()
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memory_data = process.read_memory(pixels, row_bytes * height)
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size = (width, height)
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image = None
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# See Unpack.c for the values understood after the "raw" parameter.
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if color_type == ColorType.bgra_8888.value:
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if alpha_type == AlphaType.unpremul.value:
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image = Image.frombytes("RGBA", size, memory_data.tobytes(),
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"raw", "BGRA", row_bytes, 1)
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elif alpha_type == AlphaType.premul.value:
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# RGBA instead of RGBa, because Image.show() doesn't work with RGBa.
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image = Image.frombytes("RGBA", size, memory_data.tobytes(),
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"raw", "BGRa", row_bytes, 1)
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if image:
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# Fails on premultiplied alpha, it cannot convert to RGB.
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image.show()
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else:
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print ("Need to add support for %s %s." % (
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str(ColorType(int(color_type))),
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str(AlphaType(int(alpha_type)))
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))
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sk_bitmap()
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