Cython side of Windows GDI support

Signed-off-by: Mattias Andrée <maandree@operamail.com>

1 files changed, 142 insertions, 0 deletions

diff --git a/src/blueshift_w32gdi.pyx b/src/blueshift_w32gdi.pyx
new file mode 100644
index 0000000..753bd1c
--- /dev/null
+++ b/src/blueshift_w32gdi.pyx
@@ -0,0 +1,142 @@
+# -*- 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()
+