#include <stdio.h>
#include <stdlib.h>
#include <math.h>
+#include <string.h>
+
+static inline int clamp( int v, int l, int u )
+{
+ return v < l ? l : ( v > u ? u : v );
+}
/** Do it :-).
*/
static int filter_get_image( mlt_frame this, uint8_t **image, mlt_image_format *format, int *width, int *height, int writable )
{
// Get the image
+ mlt_filter filter = mlt_frame_pop_service( this );
+ int mask = mlt_properties_get_int( MLT_FILTER_PROPERTIES( filter ), "alpha" );
int error = mlt_frame_get_image( this, image, format, width, height, 1 );
// Only process if we have no error and a valid colour space
while ( p != q )
{
- *p ++ = 251 - *r ++;
- *p ++ = 251 - *r ++;
+ *p ++ = clamp( 251 - *r ++, 16, 235 );
+ *p ++ = clamp( 256 - *r ++, 16, 240 );
+ }
+
+ if ( mask )
+ {
+ uint8_t *alpha = mlt_frame_get_alpha_mask( this );
+ int size = *width * *height;
+ memset( alpha, mask, size );
}
}
static mlt_frame filter_process( mlt_filter this, mlt_frame frame )
{
// Push the frame filter
+ mlt_frame_push_service( frame, this );
mlt_frame_push_get_image( frame, filter_get_image );
return frame;
}