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-rw-r--r--src/blueshift_vidmode.pyx26
1 files changed, 26 insertions, 0 deletions
diff --git a/src/blueshift_vidmode.pyx b/src/blueshift_vidmode.pyx
index 606310e..a4be816 100644
--- a/src/blueshift_vidmode.pyx
+++ b/src/blueshift_vidmode.pyx
@@ -64,11 +64,26 @@ Resource freeing stage of colour curve control
cdef int vidmode_gamma_size
+'''
+The size of the curves
+'''
vidmode_gamma_size = 0
+
cdef unsigned short int* r_c
+'''
+Storage space for the red colour curve in C native data structure
+'''
+
cdef unsigned short int* g_c
+'''
+Storage space for the green colour curve in C native data structure
+'''
+
cdef unsigned short int* b_c
+'''
+Storage space for the blue colour curve in C native data structure
+'''
@@ -81,15 +96,20 @@ def vidmode_open(int use_screen, display):
@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 = <unsigned short int*>malloc(256 * 2)
g_c = <unsigned short int*>malloc(256 * 2)
b_c = <unsigned short int*>malloc(256 * 2)
+ # 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
@@ -100,8 +120,10 @@ def vidmode_read(int use_crtc):
@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
'''
+ # Read the current curves
if not blueshift_vidmode_read(use_crtc, 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])
@@ -120,10 +142,12 @@ def vidmode_apply(unsigned long long use_crtcs, r_curve, g_curve, b_curve):
@param b_curve:list<unsigned short 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(use_crtcs, r_c, g_c, b_c)
@@ -131,8 +155,10 @@ 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()