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# -*- python -*-
# Copyright © 2014 Mattias Andrée (maandree@member.fsf.org)
#
# This program is free software: you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program. If not, see <http://www.gnu.org/licenses/>.
cimport cython
from libc.stdlib cimport malloc, free
from libc.stdint cimport *
cdef extern int blueshift_randr_open(int use_screen, char* display)
'''
Start stage of colour curve control
@param use_screen The screen to use
@param display The display to use, `NULL` for the current one
@return Zero on success
'''
cdef extern uint16_t* blueshift_randr_read(int use_crtc)
'''
Gets the current colour curves
@param use_crtc The CRTC to use
@return {the size of the red curve, *the red curve,
the size of the green curve, *the green curve,
the size of the blue curve, *the blue curve},
needs to be free:d. `NULL` on error.
'''
cdef extern int blueshift_randr_apply(int use_crtc, uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve)
'''
Apply stage of colour curve control
@param use_crtc The CRTC to use, -1 for all
@param r_curve The red colour curve
@param g_curve The green colour curve
@param b_curve The blue colour curve
@return Zero on success
'''
cdef extern void blueshift_randr_close()
'''
Resource freeing stage of colour curve control
'''
cdef uint16_t* r_c
'''
Storage space for the red colour curve in C native data structure
'''
cdef uint16_t* g_c
'''
Storage space for the green colour curve in C native data structure
'''
cdef uint16_t* b_c
'''
Storage space for the blue colour curve in C native data structure
'''
def randr_open(int use_screen, display):
'''
Start stage of colour curve control
@param use_screen The screen to use
@param display:bytes? The display to use, `None` for the current
@return :int Zero on success
'''
global r_c, g_c, b_c
# Get the display to use
cdef char* display_ = NULL
if display is not None:
display_ = display
# Allocate the storage space for the C native colour curves
r_c = <uint16_t*>malloc(256 * sizeof(uint16_t))
g_c = <uint16_t*>malloc(256 * sizeof(uint16_t))
b_c = <uint16_t*>malloc(256 * sizeof(uint16_t))
# Check for out-of-memory error
if (r_c is NULL) or (g_c is NULL) or (b_c is NULL):
raise MemoryError()
# Start using RandR for the screen and display
return blueshift_randr_open(use_screen, display_)
def randr_read(int use_crtc):
'''
Gets the current colour curves
@param use_crtc The CRTC to use
@return :(r:list<int>, g:list<int>, b:list<int>) The current red, green and blue colour curves
'''
cdef uint16_t* got
# Read the current curves
got = blueshift_randr_read(use_crtc)
if got is NULL:
raise Exception()
# Convert to Python integer lists
r, g, b, i = [], [], [], 0
for c in (r, g, b):
# while extracting the sizes of the curves
s = got[i]
i += 1
for j in range(s):
c.append(got[i + j])
i += s
# Free the native curves
free(got)
return (r, g, b)
def randr_apply(crtc_indices, r_curve, g_curve, b_curve):
'''
Apply stage of colour curve control
@param crtc_indices:list<int> The indices of the CRTC:s to control, -1 for all
@param r_curve:list<int> The red colour curve
@param g_curve:list<int> The green colour curve
@param b_curve:list<int> The blue colour curve
@return :int Zero on success
'''
# Convert curves to 16-bit C integers
for i in range(256):
r_c[i] = r_curve[i] & 0xFFFF
g_c[i] = g_curve[i] & 0xFFFF
b_c[i] = b_curve[i] & 0xFFFF
rc = 0
# For each selected CRTC,
for crtc_index in crtc_indices:
# apply curves.
rc |= blueshift_randr_apply(crtc_index, r_c, g_c, b_c)
return rc
def randr_close():
'''
Resource freeing stage of colour curve control
'''
# Free the storage space for the colour curves
free(r_c)
free(g_c)
free(b_c)
# Close free all resources in the native code
blueshift_randr_close()
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