[waffle] [PATCH] gbm: Use EGLConfig to select the correct gbm format

[Chad Versace]

By the way, I wrote a little Python script to ease the debugging
of GBM formats. You may find it useful too. Here's the example
usage:

$ gbm-format GBM_FORMAT_BGRA1010102
0x30334142

$ gbm-format 0x30334142
GBM_FORMAT_BGRA1010102

$ gbm-format B A 3 0
GBM_FORMAT_BGRA1010102

---- -8<- ---- file: ~/bin/gbm-format
#!/usr/bin/env python3

import os
import os.path
import re
import sys

PROGNAME = os.path.basename(sys.argv[0])

def print_usage(file=None):
    print('usage: ', file=file)
    print('  {0} GBM_FORMAT_XXXX'.format(PROGNAME), file=file)
    print('  {0} 0xabcd1234'.format(PROGNAME), file=file)
    print('  {0} a b c d'.format(PROGNAME), file=file)

def usage_error():
    print_usage(sys.stderr)
    sys.exit(1)

def atoi(c):
    assert(len(c) == 1)
    return c.encode()[0]

def gbm_fourcc_code(a, b, c, d):
    return (a) | (b << 8) | (c << 16) | (d << 24)

def gbm_iter_header():
    regex = re.compile("#define\s+(GBM_FORMAT_\w+)\s+__gbm_fourcc_code\('(.)', '(.)', '(.)', '(.)'\)")

    with open('/usr/include/gbm.h') as f:
        for line in f:
            m = regex.match(line)
            if m is None:
                continue

            test_name = m.group(1)
            test_code = gbm_fourcc_code(*map(atoi, m.group(2, 3, 4, 5)))

            yield test_name, test_code

def gbm_fourcc_code_to_name(code):
    for hname, hcode in gbm_iter_header():
        if hcode == code:
            return hname

def gbm_fourcc_name_to_code(name):
    for hname, hcode in gbm_iter_header():
        if hname == name:
            return hcode

def cmd_find_name(code):
    name = gbm_fourcc_code_to_name(code)
    if name is None:
        die('failed to find name of fourcc code 0x{:x}'.format(code))
    print(name)

def cmd_find_code(name):
    code = gbm_fourcc_name_to_code(name)
    if code is None:
        die('failed to find fourcc code for {}'.format(name))
    print('0x{:x}'.format(code))

def main():
    if len(sys.argv) == 2:
        if sys.argv[1].startswith('GBM_FORMAT_'):
            name = sys.argv[1]
            cmd_find_code(name)
        elif sys.argv[1].startswith('0x') or sys.argv[1].startswith('0X'):
            code = int(sys.argv[1], 16)
            cmd_find_name(code)
        else:
            usage_error()
    elif len(sys.argv) == 5:
        code = gbm_fourcc_code(*map(atoi, sys.argv[1:5]))
        cmd_find_name(code)
    else:
        usage_error()

if __name__ == '__main__':
    main()

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