This change was previously attempted at r.12792 but the test/offscreen demo did not run well with it.
This commit fixes the problem: the global fl_window should not be changed when drawing to
an Fl_Double_Window.
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At this point, Windows FLTK apps detect HighDPI displays and rescale their GUI accordingly. They also
all reply to ctrl/+/-/0/ keystrokes to enlarge/shrink/reset their windows.
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This became unused when window scaling no longer involved window destruction/recreation.
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Replace compiler/preprocessor/platform macro "WIN32" with "_WIN32".
Replace "WIN32" in text and documentation with "Windows".
Replace "MSWindows" with "Windows".
To do: README.Windows.txt (and maybe other documentation as well)
needs updates.
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This commit also simplifies the platform-dependent support of fl_read_image():
only Fl_XXX_Screen_Driver::read_win_rectangle() contains platform-specific
code to capture pixels from the current window or from an offscreen buffer.
Platform-independent function Fl_Screen_Driver::traverse_to_gl_subwindows()
captures subwindows that intersect with the area fl_read_image() targets.
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This second step replaces FL/x.H with FL/platform.H in all source files.
Dependencies have been adjusted as well.
This commit completes the replacement of FL/x.H with FL/platform.H.
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With this, most MacOS FLTK app can be scaled with command/+/-/0/ keystrokes.
A scaling problem remains, visible in test/cube, where the "Test" string is not positioned correctly.
GLUT apps can also be scaled (across platforms).
SVG images are re-rasterized after app scaling for optimal drawing.
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Note: don't use fl_getenv() in Fl_System_Driver and derived classes.
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Remove duplicated code by using local (static) string conversion functions.
This makes the code better maintainable and removes redundancies.
Rename some variables (particularly one-letter names) to more useful
names, minor code reformatting to be more compatible with the CMP.
To do: check for potential memory leaks, maybe free temporary buffers.
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Tested under Windows and Linux, but not yet used in library code.
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The default (0) is 'text' mode, non-zero is 'binary' mode on platforms
that distinguish text and binary mode.
Currently Windows is the only supported platform that needs this.
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This new function allows to write Fl_SVG_Image::fl_gzopen() in a completely platform-independent way.
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This avoids repeating the default values "Shift", "Meta", etc... for several platforms.
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This commit uses thread-specific, locale-setting functions under Linux and MSWindows-Visual Studio
They are already used by the Mac OS system driver, when possible.
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A bug was visible in test/unittests when moving between lines and rectangles.
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The effect was that the file_chooser test app did not recognize the window scaling factor.
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It's still necessary to compile with -DFLTK_HIDPI_SUPPORT
to activate the new HiDPI support.
Default builds get the same HiDPI support as in FLTK 1.3
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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.
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