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