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-rw-r--r--src/blueshift_w32gdi.pyx142
1 files changed, 142 insertions, 0 deletions
diff --git a/src/blueshift_w32gdi.pyx b/src/blueshift_w32gdi.pyx
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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_w32gdi_open()
+'''
+Start stage of colour curve control
+
+@return Zero on success
+'''
+
+cdef extern int blueshift_w32gdi_crtc_count()
+'''
+Get the number of CRTC:s on the system
+
+@return The number of CRTC:s on the system
+'''
+
+cdef extern uint16_t* blueshift_w32gdi_read(int use_crtc)
+'''
+Gets the current colour curves
+
+@param use_crtc The CRTC to use
+@return {the size of the each curve, *the red curve,
+ *the green curve, *the blue curve},
+ needs to be free:d. `NULL` on error.
+'''
+
+cdef extern int blueshift_w32gdi_apply(int use_crtc, uint16_t* rgb_curves)
+'''
+Apply stage of colour curve control
+
+@param use_crtc The CRTC to use, -1 for all
+@param rgb_curve The concatenation of the red, the green and the blue colour curves
+@return Zero on success
+'''
+
+cdef extern void blueshift_w32gdi_close()
+'''
+Resource freeing stage of colour curve control
+'''
+
+
+
+cdef uint16_t* rgb_c
+'''
+Storage space for the colour curves in C native data structure
+'''
+
+
+
+def w32gdi_open():
+ '''
+ Start stage of colour curve control
+
+ @return :int Zero on success
+ '''
+ global rgb_c
+ # Allocate the storage space for the C native colour curves
+ rgb_c = <uint16_t*>malloc(3 * 256 * sizeof(uint16_t))
+ # Check for out-of-memory error
+ if (rgb_c is NULL):
+ raise MemoryError()
+ # Start using W32 GDI
+ return blueshift_w32gdi_open()
+
+
+def w32gdi_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_w32_read(use_crtc)
+ if got is NULL:
+ raise Exception()
+ # Convert to Python integer lists
+ r, g, b, i = [], [], [], 1
+ s = got[0]
+ for c in (r, g, b):
+ # while extracting the sizes of the curves
+ for j in range(s):
+ c.append(got[i + j])
+ i += s
+ # Free the native curves
+ free(got)
+ return (r, g, b)
+
+
+def w32gdi_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 Zero on success
+ '''
+ # Convert curves to 16-bit C integers
+ for i in range(256):
+ rgb_c[0 * 256 + i] = r_curve[i] & 0xFFFF
+ rgb_c[1 * 256 + i] = g_curve[i] & 0xFFFF
+ rgb_c[2 * 256 + i] = b_curve[i] & 0xFFFF
+ rc = 0
+ # For each selected CRTC,
+ for crtc_index in crtc_indices:
+ # apply curves.
+ rc |= blueshift_w32gdi_apply(crtc_index, r_c, g_c, b_c)
+ return rc
+
+
+def w32gdi_close():
+ '''
+ Resource freeing stage of colour curve control
+ '''
+ # Free the storage space for the colour curves
+ free(rgb_c)
+ # Close free all resources in the native code
+ blueshift_w32gdi_close()
+