diff options
Diffstat (limited to 'src/Fl_Image_Surface.cxx')
| -rw-r--r-- | src/Fl_Image_Surface.cxx | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/src/Fl_Image_Surface.cxx b/src/Fl_Image_Surface.cxx index c45ddbc16..63b0c18fc 100644 --- a/src/Fl_Image_Surface.cxx +++ b/src/Fl_Image_Surface.cxx @@ -178,6 +178,30 @@ void fl_end_offscreen() { Fl_Surface_Device::pop_current(); } +/** Adapts an offscreen buffer to a changed value of the graphical scaling factor. + The \p ctx argument must have been created by fl_create_offscreen() + and the calling context must not be between fl_begin_offscreen() and fl_end_offscreen(). + */ +void fl_scale_offscreen(Fl_Offscreen &ctx) { + int i, w, h; + for (i = 0; i < count_offscreens; i++) { + if (offscreen_api_surface[i] && offscreen_api_surface[i]->offscreen() == ctx) { + break; + } + } + if (i >= count_offscreens) return; + Fl_RGB_Image *rgb = offscreen_api_surface[i]->image(); + offscreen_api_surface[i]->printable_rect(&w, &h); + fl_delete_offscreen(ctx); + Fl_Shared_Image *shared = Fl_Shared_Image::get(rgb); + shared->scale(w, h, 0, 1); + ctx = fl_create_offscreen(w, h); + fl_begin_offscreen(ctx); + shared->draw(0, 0); + fl_end_offscreen(); + shared->release(); +} + /** @} */ |