Continue support for GUI rescaling under MacOS: fix fl_XXX_offscreen() functions and Fl_Image_Surface class

git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12605 ea41ed52-d2ee-0310-a9c1-e6b18d33e121

2 files changed, 29 insertions, 9 deletions

diff --git a/src/drivers/Quartz/Fl_Quartz_Graphics_Driver.cxx b/src/drivers/Quartz/Fl_Quartz_Graphics_Driver.cxx
index 26f12d6e5..8e9ae0906 100644
--- a/src/drivers/Quartz/Fl_Quartz_Graphics_Driver.cxx
+++ b/src/drivers/Quartz/Fl_Quartz_Graphics_Driver.cxx
@@ -20,6 +20,8 @@
 #include "Fl_Quartz_Graphics_Driver.H"
 #include "../Darwin/Fl_Darwin_System_Driver.H"
 #include <FL/x.H>
+#include <FL/fl_draw.H>
+#include <FL/Fl_Image_Surface.H>
 
 #if HAS_ATSU && MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5
 Fl_Quartz_Graphics_Driver::pter_to_draw_member Fl_Quartz_Graphics_Driver::CoreText_or_ATSU_draw;
@@ -84,7 +86,8 @@ void Fl_Quartz_Graphics_Driver::global_gc()
   fl_gc = (CGContextRef)gc();
 }
 
-void Fl_Quartz_Graphics_Driver::copy_offscreen(int x,int y,int w,int h,Fl_Offscreen osrc,int srcx,int srcy) {
+void Fl_Quartz_Graphics_Driver::copy_offscreen(int x, int y, int w, int h, Fl_Offscreen osrc, int srcx, int srcy) {
+  // draw portion srcx,srcy,w,h of osrc to position x,y (top-left) of the graphics driver's surface
   CGContextRef src = (CGContextRef)osrc;
   void *data = CGBitmapContextGetData(src);
   int sw = CGBitmapContextGetWidth(src);
@@ -92,16 +95,26 @@ void Fl_Quartz_Graphics_Driver::copy_offscreen(int x,int y,int w,int h,Fl_Offscr
   CGImageAlphaInfo alpha = CGBitmapContextGetAlphaInfo(src);
   CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
   // when output goes to a Quartz printercontext, release of the bitmap must be
-  // delayed after the end of the print page
+  // delayed after the end of the printed page
   CFRetain(src);
   CGDataProviderRef src_bytes = CGDataProviderCreateWithData( src, data, sw*sh*4, bmProviderRelease);
   CGImageRef img = CGImageCreate( sw, sh, 8, 4*8, 4*sw, lut, alpha,
                                  src_bytes, 0L, false, kCGRenderingIntentDefault);
-  draw_CGImage(img, x, y, w, h, srcx, srcy,  sw, sh);
-
-  CGImageRelease(img);
-  CGColorSpaceRelease(lut);
   CGDataProviderRelease(src_bytes);
+  CGColorSpaceRelease(lut);
+  float s = scale_;
+  Fl_Surface_Device *current = Fl_Surface_Device::surface();
+  // test whether osrc was created by fl_create_offscreen()
+  fl_begin_offscreen(osrc); // does nothing if osrc was not created by fl_create_offscreen()
+  if (current != Fl_Surface_Device::surface()) { // osrc was created by fl_create_offscreen()
+    Fl_Image_Surface *imgs = (Fl_Image_Surface*)Fl_Surface_Device::surface();
+    int pw, ph;
+    imgs->printable_rect(&pw, &ph);
+    s = sw / float(pw);
+    fl_end_offscreen();
+  }
+  draw_CGImage(img, x, y, w, h, srcx, srcy, sw/s, sh/s);
+  CGImageRelease(img);
 }
 
 // so a CGRect matches exactly what is denoted x,y,w,h for clipping purposes
diff --git a/src/drivers/Quartz/Fl_Quartz_Image_Surface_Driver.cxx b/src/drivers/Quartz/Fl_Quartz_Image_Surface_Driver.cxx
index c8d751aa1..573a5df8e 100644
--- a/src/drivers/Quartz/Fl_Quartz_Image_Surface_Driver.cxx
+++ b/src/drivers/Quartz/Fl_Quartz_Image_Surface_Driver.cxx
@@ -23,6 +23,7 @@
 #include <FL/fl_draw.H>
 #include <FL/Fl_Image_Surface.H>
 #include "Fl_Quartz_Graphics_Driver.H"
+#include "../Cocoa/Fl_Cocoa_Window_Driver.H"
 #include <ApplicationServices/ApplicationServices.h>
 
 class Fl_Quartz_Image_Surface_Driver : public Fl_Image_Surface_Driver {
@@ -46,15 +47,21 @@ Fl_Image_Surface_Driver *Fl_Image_Surface_Driver::newImageSurfaceDriver(int w, i
 
 
 Fl_Quartz_Image_Surface_Driver::Fl_Quartz_Image_Surface_Driver(int w, int h, int high_res, Fl_Offscreen off) : Fl_Image_Surface_Driver(w, h, high_res, 0) {
-  int W = high_res ? 2*w : w;
-  int H = high_res ? 2*h : h;
+  int W = w, H = h;
+  float s = 1;
+  if (high_res) {
+    s = Fl_Graphics_Driver::default_driver().scale();
+    Fl_Window *cw = Fl_Window::current();
+    if (cw && ((Fl_Cocoa_Window_Driver*)cw->driver())->mapped_to_retina()) s *= 2;
+    W *= s; H *= s;
+  }
   CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
   offscreen = off ? off : CGBitmapContextCreate(calloc(W*H,4), W, H, 8, W*4, lut, kCGImageAlphaPremultipliedLast);
   CGColorSpaceRelease(lut);
   driver(new Fl_Quartz_Graphics_Driver);
   CGContextTranslateCTM(offscreen, 0.5, -0.5); // as when drawing to a window
   if (high_res) {
-    CGContextScaleCTM(offscreen, 2, 2);
+    CGContextScaleCTM(offscreen, s, s);
   }
   CGContextSetShouldAntialias(offscreen, false);
   CGContextTranslateCTM(offscreen, 0, height);