2ddc89fb61
The X11 platform uses this argument to restore the correct clipping state after drawing to an Fl_Image_Surface object. git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12226 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
114 lines
3.4 KiB
C++
114 lines
3.4 KiB
C++
//
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// "$Id$"
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//
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// implementation of Fl_Device class for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 2010-2017 by Bill Spitzak and others.
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//
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// This library is free software. Distribution and use rights are outlined in
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// the file "COPYING" which should have been included with this file. If this
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// file is missing or damaged, see the license at:
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//
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// http://www.fltk.org/COPYING.php
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//
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// Please report all bugs and problems to:
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//
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// http://www.fltk.org/str.php
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//
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#include <FL/Fl.H>
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#include "config_lib.h"
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#include <FL/Fl_Device.H>
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#include <FL/Fl_Graphics_Driver.H>
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/* Attempt at an inheritance diagram.
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+- Fl_Surface_Device: any kind of surface that we can draw onto -> uses an Fl_Graphics_Driver
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+- Fl_Display_Device: some kind of video device
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+- Fl_Copy_Surface: create an image for dnd or copy/paste
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+- Fl_Image_Surface: create an RGB Image
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+- Fl_Paged_Device: output to a printer or similar
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+- Fl_..._Surface_: platform specific driver
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+- Fl_Printer: user can instantiate this to gain access to a printer
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+- Fl_System_Printer:
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+- Fl_PostScript_File_Device
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+- Fl_PostScript_Printer
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+- Fl_Graphics_Driver
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+- Fl_..._Graphics_Driver: platform specific graphics driver
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*/
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/** Make this surface the current drawing surface.
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This surface will receive all future graphics requests.
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\p Starting from FLTK 1.4.0, another convenient API to set/unset the current drawing surface
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is Fl_Surface_Device::push_current( ) / Fl_Surface_Device::pop_current().*/
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void Fl_Surface_Device::set_current(void)
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{
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if (surface_) surface_->end_current_(this);
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fl_graphics_driver = pGraphicsDriver;
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surface_ = this;
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pGraphicsDriver->global_gc();
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}
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Fl_Surface_Device* Fl_Surface_Device::surface_; // the current target surface of graphics operations
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Fl_Surface_Device::~Fl_Surface_Device()
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{
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if (surface_ == this) surface_ = NULL;
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}
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/** A constructor that sets the graphics driver used by the display */
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Fl_Display_Device::Fl_Display_Device(Fl_Graphics_Driver *graphics_driver) : Fl_Surface_Device(graphics_driver) {
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this->set_current();
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};
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/** Returns a pointer to the unique display device */
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Fl_Display_Device *Fl_Display_Device::display_device() {
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static Fl_Display_Device *display = new Fl_Display_Device(Fl_Graphics_Driver::newMainGraphicsDriver());
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return display;
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};
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Fl_Surface_Device *Fl_Surface_Device::default_surface()
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{
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return Fl_Display_Device::display_device();
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}
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static unsigned int surface_stack_height = 0;
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static Fl_Surface_Device *surface_stack[16];
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/** Pushes \p new_current on top of the stack of current drawing surfaces, and makes it current.
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\p new_current will receive all future graphics requests.
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\version 1.4.0 */
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void Fl_Surface_Device::push_current(Fl_Surface_Device *new_current)
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{
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if (surface_stack_height < sizeof(surface_stack)/sizeof(void*)) {
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surface_stack[surface_stack_height++] = surface();
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} else {
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fprintf(stderr, "FLTK Fl_Surface_Device::push_current Stack overflow error\n");
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}
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new_current->set_current();
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}
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/** Removes the top element from the current drawing surface stack, and makes the new top element current.
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\return A pointer to the new current drawing surface.
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\version 1.4.0 */
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Fl_Surface_Device *Fl_Surface_Device::pop_current()
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{
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if (surface_stack_height > 0) surface_stack[--surface_stack_height]->set_current();
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return surface_;
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}
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//
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// End of "$Id$".
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//
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