From 8286e37b18dcbf788cea188a9f1df5824baf0731 Mon Sep 17 00:00:00 2001
From: ManoloFLTK <41016272+ManoloFLTK@users.noreply.github.com>
Date: Tue, 9 Apr 2019 18:50:18 +0200
Subject: Add public function Fl_RGB_Image *fl_capture_window_part()

In the context of HighDPI screens, the API of function fl_read_image()
is inadequate because a rectangle of size WxH drawing units
of a window may contain many more than W*H pixels.

Function fl_capture_window_part() returns an Fl_RGB_Image
object whose drawing size matches the size of the rectangle
and whose data size matches the, possibly larger, size in pixels
of the corresponding area of the mapped window.
---
 FL/fl_draw.H | 1 +
 1 file changed, 1 insertion(+)

(limited to 'FL')

diff --git a/FL/fl_draw.H b/FL/fl_draw.H
index f1a867071..3805190b3 100644
--- a/FL/fl_draw.H
+++ b/FL/fl_draw.H
@@ -794,6 +794,7 @@ inline void fl_draw_image_mono(Fl_Draw_Image_Cb cb, void* data, int X,int Y,int
 inline char fl_can_do_alpha_blending() {return Fl_Graphics_Driver::default_driver().can_do_alpha_blending();}
 
 FL_EXPORT uchar *fl_read_image(uchar *p,int X,int Y,int W,int H,int alpha=0);
+FL_EXPORT Fl_RGB_Image *fl_capture_window_part(Fl_Window *win, int x, int y, int w, int h);
 
 // pixmaps:
 /**
-- 
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