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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_vidmode_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 error, otherwise the size of colours curves
'''
cdef extern int blueshift_vidmode_read(uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve)
'''
Gets the current colour curves
@param r_gamma Storage location for the red colour curve
@param g_gamma Storage location for the green colour curve
@param b_gamma Storage location for the blue colour curve
@return Zero on success
'''
cdef extern int blueshift_vidmode_apply(uint16_t* r_curve, uint16_t* g_curve, uint16_t* b_curve)
'''
Apply stage of colour curve control
@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_vidmode_close()
'''
Resource freeing stage of colour curve control
'''
cdef int vidmode_gamma_size
'''
The size of the curves
'''
vidmode_gamma_size = 0
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 vidmode_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 :bool Whether call was successful
'''
global vidmode_gamma_size, 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 VidMode for the screen and display
vidmode_gamma_size = blueshift_vidmode_open(use_screen, display_)
# Successful only if we got an even usable size for the curves
return vidmode_gamma_size > 1
def vidmode_read():
'''
Gets the current colour curves
@return :(r:list<int>, g:list<int>, b:list<int>) The current red, green and blue colour curves
'''
# Read the current curves
if not blueshift_vidmode_read(r_c, g_c, b_c) == 0:
raise Exception()
# Convert to Python integer lists
r, g, b = [], [], []
for i in range(vidmode_gamma_size):
r.append(r_c[i])
g.append(g_c[i])
b.append(b_c[i])
return (r, g, b)
def vidmode_apply(r_curve, g_curve, b_curve):
'''
Apply stage of colour curve control
@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 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
# Apply curves
return blueshift_vidmode_apply(r_c, g_c, b_c)
def vidmode_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_vidmode_close()
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