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//
// "$Id$"
//
// Draw-to-image code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2016 by Bill Spitzak and others.
//
// This library is free software. Distribution and use rights are outlined in
// the file "COPYING" which should have been included with this file. If this
// file is missing or damaged, see the license at:
//
// http://www.fltk.org/COPYING.php
//
// Please report all bugs and problems on the following page:
//
// http://www.fltk.org/str.php
//
#include <FL/Fl_Image_Surface.H>
#if defined(FL_PORTING)
# pragma message "FL_PORTING: optionally implement class Fl_XXX_Image_Surface_Driver for your platform"
Fl_Image_Surface_Driver *Fl_Image_Surface_Driver::newImageSurfaceDriver(int w, int h, int high_res, Fl_Offscreen)
{
return NULL;
}
#endif
/** Constructor with optional high resolution.
\param w and \param h give the size in pixels of the resulting image.
\param high_res if non-zero, the surface pixel size is twice as high and wide as w and h,
which is useful to draw it later on a high resolution display (e.g., retina display).
This is implemented for the Mac OS platform only.
If \p highres is non-zero, use Fl_Image_Surface::highres_image() to get the image data.
\param pixmap is used internally by FLTK; applications just use its default value.
\version 1.3.4 (1.3.3 without the highres parameter)
*/
Fl_Image_Surface::Fl_Image_Surface(int w, int h, int high_res, Fl_Offscreen pixmap) : Fl_Widget_Surface(NULL) {
platform_surface = Fl_Image_Surface_Driver::newImageSurfaceDriver(w, h, high_res, pixmap);
if (platform_surface) driver(platform_surface->driver());
}
/** The destructor. */
Fl_Image_Surface::~Fl_Image_Surface() { delete platform_surface; }
void Fl_Image_Surface::origin(int x, int y) {platform_surface->origin(x, y);}
void Fl_Image_Surface::origin(int *x, int *y) {
if (platform_surface) platform_surface->origin(x, y);
}
void Fl_Image_Surface::set_current() {
if (platform_surface) platform_surface->set_current();
}
void Fl_Image_Surface::translate(int x, int y) {
if (platform_surface) platform_surface->translate(x, y);
}
void Fl_Image_Surface::untranslate() {
if (platform_surface) platform_surface->untranslate();
}
/** Returns the Fl_Offscreen object associated to the image surface.
The returned Fl_Offscreen object is deleted when the Fl_Image_Surface object is deleted.
*/
Fl_Offscreen Fl_Image_Surface::offscreen() {
return platform_surface ? platform_surface->offscreen : (Fl_Offscreen)0;
}
int Fl_Image_Surface::printable_rect(int *w, int *h) {return platform_surface->printable_rect(w, h);}
/** Returns an image made of all drawings sent to the Fl_Image_Surface object.
The returned object contains its own copy of the RGB data.
The caller is responsible for deleting the image.
*/
Fl_RGB_Image *Fl_Image_Surface::image() {return platform_surface->image();}
/** Returns a possibly high resolution image made of all drawings sent to the Fl_Image_Surface object.
The Fl_Image_Surface object should have been constructed with Fl_Image_Surface(W, H, 1).
The returned image is scaled to a size of WxH drawing units and may have a pixel size twice as wide and high.
The returned object should be deallocated with Fl_Shared_Image::release() after use.
\version 1.3.4
*/
Fl_Shared_Image* Fl_Image_Surface::highres_image()
{
if (!platform_surface) return NULL;
Fl_Shared_Image *s_img = Fl_Shared_Image::get(platform_surface->image());
int width, height;
platform_surface->printable_rect(&width, &height);
s_img->scale(width, height);
return s_img;
}
/** Allows to delete the Fl_Image_Surface object while keeping its underlying Fl_Offscreen.
This member function is intended for internal use by the FLTK library.
*/
Fl_Offscreen Fl_Image_Surface::get_offscreen_before_delete() {
Fl_Offscreen keep = platform_surface->offscreen;
platform_surface->offscreen = 0;
return keep;
}
// implementation of the fl_XXX_offscreen() functions
static Fl_Image_Surface **offscreen_api_surface = NULL;
static int count_offscreens = 0;
static int find_slot(void) { // return an available slot to memorize an Fl_Image_Surface object
static int max = 0;
for (int num = 0; num < count_offscreens; num++) {
if (!offscreen_api_surface[num]) return num;
}
if (count_offscreens >= max) {
max += 20;
offscreen_api_surface = (Fl_Image_Surface**)realloc(offscreen_api_surface, max * sizeof(void *));
}
return count_offscreens++;
}
/** \addtogroup fl_drawings
@{
*/
/**
Creation of an offscreen graphics buffer.
\param w,h width and height in pixels of the buffer.
\return the created graphics buffer.
*/
Fl_Offscreen fl_create_offscreen(int w, int h) {
int rank = find_slot();
offscreen_api_surface[rank] = new Fl_Image_Surface(w, h, 0);
return offscreen_api_surface[rank]->offscreen();
}
/** Deletion of an offscreen graphics buffer.
\param ctx the buffer to be deleted.
\note The \p ctx argument must have been created by fl_create_offscreen().
*/
void fl_delete_offscreen(Fl_Offscreen ctx) {
if (!ctx) return;
for (int i = 0; i < count_offscreens; i++) {
if (offscreen_api_surface[i] && offscreen_api_surface[i]->offscreen() == ctx) {
delete offscreen_api_surface[i];
offscreen_api_surface[i] = NULL;
}
}
}
/** Send all subsequent drawing commands to this offscreen buffer.
\param ctx the offscreen buffer.
*/
void fl_begin_offscreen(Fl_Offscreen ctx) {
for (int i = 0; i < count_offscreens; i++) {
if (offscreen_api_surface[i] && offscreen_api_surface[i]->offscreen() == ctx) {
Fl_Surface_Device::push_current(offscreen_api_surface[i]);
return;
}
}
}
/** Quit sending drawing commands to the current offscreen buffer.
*/
void fl_end_offscreen() {
Fl_Surface_Device::pop_current();
}
/** @} */
//
// End of "$Id$".
//
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