41eb376060
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@12904 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
123 lines
4.0 KiB
C++
123 lines
4.0 KiB
C++
//
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// "$Id$"
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//
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// Draw-to-image code for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2016 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 on the following page:
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//
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// http://www.fltk.org/str.php
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//
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#ifndef Fl_Image_Surface_H
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#define Fl_Image_Surface_H
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#include <FL/Fl_Widget_Surface.H>
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#include <FL/Fl_Image.H>
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#include <FL/Fl_Shared_Image.H>
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#include <FL/Fl_Graphics_Driver.H> // for Fl_Offscreen
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/**
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\brief Directs all graphics requests to an Fl_Image.
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After creation of an Fl_Image_Surface object, make it the current drawing
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surface calling Fl_Surface_Device::push_current(), and all
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subsequent graphics requests will be recorded in the image. It's possible to
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draw widgets (using Fl_Image_Surface::draw()) or to use any of the
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\ref fl_drawings or the \ref fl_attributes. Finally, call image() on the object
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to obtain a newly allocated Fl_RGB_Image object.
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Fl_GL_Window objects can be drawn in the image as well.
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Usage example:
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\code
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// this is the widget that you want to draw into an image
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Fl_Widget *g = ...;
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// create an Fl_Image_Surface object
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Fl_Image_Surface *image_surface = new Fl_Image_Surface(g->w(), g->h());
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// direct all further graphics requests to the image
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Fl_Surface_Device::push_current(image_surface);
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// draw a white background
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fl_color(FL_WHITE);
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fl_rectf(0, 0, g->w(), g->h());
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// draw the g widget in the image
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image_surface->draw(g);
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// get the resulting image
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Fl_RGB_Image* image = image_surface->image();
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// direct graphics requests back to their previous destination
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Fl_Surface_Device::pop_current();
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// delete the image_surface object, but not the image itself
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delete image_surface;
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\endcode
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*/
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class FL_EXPORT Fl_Image_Surface : public Fl_Widget_Surface {
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friend FL_EXPORT Fl_Offscreen fl_create_offscreen(int w, int h);
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friend FL_EXPORT void fl_begin_offscreen(Fl_Offscreen ctx);
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friend FL_EXPORT void fl_end_offscreen(void);
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friend FL_EXPORT void fl_delete_offscreen(Fl_Offscreen ctx);
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friend class Fl_Graphics_Driver;
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private:
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class Fl_Image_Surface_Driver *platform_surface;
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Fl_Offscreen get_offscreen_before_delete_();
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protected:
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void translate(int x, int y);
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void untranslate();
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public:
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Fl_Image_Surface(int w, int h, int high_res = 0, Fl_Offscreen off = 0);
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~Fl_Image_Surface();
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void set_current();
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Fl_RGB_Image *image();
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Fl_Shared_Image *highres_image();
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void origin(int *x, int *y);
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void origin(int x, int y);
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int printable_rect(int *w, int *h);
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Fl_Offscreen offscreen();
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};
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/** A base class describing the interface between FLTK and draw-to-image operations.
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This class is only for internal use by the FLTK library.
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A supported platform should implement the virtual methods of this class
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in order to support drawing to an Fl_RGB_Image through class Fl_Image_Surface.
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*/
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class Fl_Image_Surface_Driver : public Fl_Widget_Surface {
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friend class Fl_Image_Surface;
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protected:
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int width;
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int height;
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Fl_Offscreen offscreen;
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int external_offscreen;
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Fl_Image_Surface_Driver(int w, int h, int high_res, Fl_Offscreen off) : Fl_Widget_Surface(NULL), width(w), height(h), offscreen(off) {external_offscreen = (off != 0);}
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virtual ~Fl_Image_Surface_Driver() {}
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virtual void set_current() {}
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virtual void translate(int x, int y) {}
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virtual void untranslate() {}
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int printable_rect(int *w, int *h) {*w = width; *h = height; return 0;}
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virtual Fl_RGB_Image *image() {return NULL;}
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/** Each platform implements this function its own way.
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It returns an object implementing all virtual functions
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of class Fl_Image_Surface_Driver for the plaform.
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*/
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static Fl_Image_Surface_Driver *newImageSurfaceDriver(int w, int h, int high_res, Fl_Offscreen off);
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};
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#endif // Fl_Image_Surface_H
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//
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// End of "$Id$".
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//
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