Corresponds to STR #3320
1) HiDPI support consists in detecting the adequate scaling factor for the screen on which
FLTK maps a window, and scaling all FLTK units by this factor. FLTK tries to detect the correct
value of this factor at startup (see more details below). Environment variable
FLTK_SCALING_FACTOR can also be used to set this value.
2) Rescaling support consists in changing the scaling factor of all FLTK windows
in reply to ctrl/+/-/0/ keystrokes.
More details for the various platforms :
- X11: Support is very advanced. Some details need still to be improved.
Automatic detection of the correct starting value of the scaling factor works well
with the gnome desktop. The present code contains no support for this on
other desktops. FLTK_SCALING_FACTOR provides a workaround.
-WIN32: Support is incomplete at this point, although many test
applications have partial or complete HiDPI and scaling support.
The current value of the system's scaling factor is correctly detected
at application startup. Apps respond to changes of this value in real time.
Support needs to define the FLTK_HIDPI_SUPPORT preprocessor variable
at compile time. This way, standard builds produce a code with the
default WIN32 HiDPI support, that is, where all graphics goes to an internal
buffer that gets enlarged by the system and then mapped to the HiDPI
display. To experiment with (or develop) the new HiDPI support requires
a modified build procedure in which FLTK_HIDPI_SUPPORT is defined
at compile time. When the support will be complete, the requirement for the
definition of this preprocessor variable will be removed. The present commit
contains support for a single scaling factor. Eventually, per-screen scaling
factors should be implemented, as done for X11.
- MacOS: this commit does not give new HiDPI for this platform.
Eventually, window rescaling in reply to command/+/-/0/ is desirable.
Per-screen scaling factor makes no sense on this platform because
the OS itself takes care of the difference between the resolutions of
traditional and retina displays.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12239 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Documentation has been fixed and clarified, and ld() handling is now
consistent in Fl_(RGB_)Image, their subclasses and fl_draw_image()
and similar functions.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@12029 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Also, document what is the value of alloc_array after construction of an Fl_RGB_Image object.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11897 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
- change image caching variable types to uintptr_t
- added driver function to uncache image data
- cleaning up (Xlib and GDI will likely throw syntax errors. Trying to fix ASAP)
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3-porting@11138 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Also added coded example to assist app programmers in usage. (Matt: feel free to modify
the example code as needed)
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10734 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
../FL/Fl_Image.H:58: error: ISO C++ forbids initialization of member 'ERR_NO_IMAGE'
../FL/Fl_Image.H:58: error: making 'ERR_NO_IMAGE' static
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10733 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Useful for printing, PostScript or PDF output, or retina displays.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10615 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
See also discussion in fltk.coredev of Sept 07, 2014 and later
with subject "Fixing the nearest-neighbour scaling".
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10377 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This is very convenient as a lot of other functions only accept
a Fl_RGB_Image. Adding this functionality also required a bit
of spring cleaning in the the drawing routines. STR #2659.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@10192 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
conflict with Mac OS X/gcc 3.x name clash when compiling with obj-c.
Also made them private instead of public.
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@7273 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
system headers (which unfortunately are not too friendly with other
code...)
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2893 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Don't use png_read_destroy() - it doesn't free all memory.
Add uncache() method to image classes.
Memory/initialization bugs in Fl_File_Chooser (valgrind)
Make sure both Fl_Window constructors have default cursor initialization
code...
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2562 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
Fix more export problems, make some more static inline methods regular
functions, don't use FL_NORMAL_SIZE in a static initializer since BC++
doesn't seem to support it...
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@2531 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
