From bbfd91977309465464a318e69dfad2bbfbc5df5a Mon Sep 17 00:00:00 2001
From: Manolo Gouy <Manolo>
Date: Sat, 22 Oct 2016 11:42:20 +0000
Subject: WIN platform: implement Fl_GDI_Graphics_Driver::draw_scaled(Fl_Image
 *img,int,int,int,int) when img is a Fl_RGB_Image

Implementation uses StretchBlt() when img->d() is  1 or 3 and AlphaBlend() when it is 2 or 4.
This should turn useful to draw images on HighDPI displays using the display's true resolution.

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@12053 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
---
 src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

(limited to 'src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx')

diff --git a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
index e10191ec2..1ba2a198a 100644
--- a/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
+++ b/src/drivers/GDI/Fl_GDI_Graphics_Driver.cxx
@@ -113,6 +113,10 @@ void Fl_GDI_Graphics_Driver::copy_offscreen(int x,int y,int w,int h,HBITMAP bitm
   DeleteDC(new_gc);
 }
 
+BOOL Fl_GDI_Graphics_Driver::alpha_blend_(int x, int y, int w, int h, HDC src_gc, int srcx, int srcy, int srcw, int srch) {
+  return fl_alpha_blend(gc_, x, y, w, h, src_gc, srcx, srcy, srcw, srch, blendfunc);
+}
+
 #if ! defined(FL_DOXYGEN)
 void Fl_GDI_Graphics_Driver::copy_offscreen_with_alpha(int x,int y,int w,int h,HBITMAP bitmap,int srcx,int srcy) {
   HDC new_gc = CreateCompatibleDC(gc_);
@@ -121,7 +125,7 @@ void Fl_GDI_Graphics_Driver::copy_offscreen_with_alpha(int x,int y,int w,int h,H
   BOOL alpha_ok = 0;
   // first try to alpha blend
   if ( can_do_alpha_blending() ) {
-    alpha_ok = fl_alpha_blend(gc_, x, y, w, h, new_gc, srcx, srcy, w, h, blendfunc);
+    alpha_ok = alpha_blend_(x, y, w, h, new_gc, srcx, srcy, w, h);
   }
   // if that failed (it shouldn't), still copy the bitmap over, but now alpha is 1
   if (!alpha_ok) {
-- 
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