diff options
Diffstat (limited to 'core/image.cpp')
| -rw-r--r-- | core/image.cpp | 25 |
1 files changed, 25 insertions, 0 deletions
diff --git a/core/image.cpp b/core/image.cpp index ccabd04d6f..db20862af5 100644 --- a/core/image.cpp +++ b/core/image.cpp @@ -1660,6 +1660,31 @@ void Image::set_compress_bc_func(void (*p_compress_func)(Image *)) { } + +void Image::premultiply_alpha() { + + if (data.size()==0) + return; + + if (format!=FORMAT_RGBA) + return; //not needed + + DVector<uint8_t>::Write wp = data.write(); + unsigned char *data_ptr=wp.ptr(); + + + for(int i=0;i<height;i++) { + for(int j=0;j<width;j++) { + + BColor bc = _get_pixel(j,i,data_ptr,0); + bc.r=(int(bc.r)*int(bc.a))>>8; + bc.g=(int(bc.g)*int(bc.a))>>8; + bc.b=(int(bc.b)*int(bc.a))>>8; + _put_pixel(j,i,bc,data_ptr); + } + } +} + void Image::fix_alpha_edges() { if (data.size()==0) |