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//
// Draw-to-image code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2023 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:
//
// https://www.fltk.org/COPYING.php
//
// Please see the following page on how to report bugs and issues:
//
// https://www.fltk.org/bugs.php
//
#include <FL/platform.H>
#include "Fl_Xlib_Image_Surface_Driver.H"
#include "../../Fl_Screen_Driver.H"
#include <stdlib.h>
#if FLTK_USE_CAIRO
# include <cairo-xlib.h>
# include "../Cairo/Fl_X11_Cairo_Graphics_Driver.H"
#else
# include "Fl_Xlib_Graphics_Driver.H"
#endif // FLTK_USE_CAIRO
Fl_Xlib_Image_Surface_Driver::Fl_Xlib_Image_Surface_Driver(int w, int h, int high_res, Fl_Offscreen off) : Fl_Image_Surface_Driver(w, h, high_res, off) {
float d = 1;
if (!off) {
fl_open_display();
d = Fl_Graphics_Driver::default_driver().scale();
if (d != 1 && high_res) {
w = int(w*d);
h = int(h*d);
}
offscreen = (Fl_Offscreen)XCreatePixmap(fl_display, RootWindow(fl_display, fl_screen), w, h, fl_visual->depth);
}
shape_data_ = NULL;
#if FLTK_USE_CAIRO
driver(new Fl_X11_Cairo_Graphics_Driver());
cairo_surface_t *s = cairo_xlib_surface_create(fl_display, offscreen, fl_visual->visual, w, h);
cairo_ = cairo_create(s);
cairo_surface_destroy(s);
cairo_save(cairo_);
((Fl_X11_Cairo_Graphics_Driver*)driver())->set_cairo(cairo_);
#else
driver(new Fl_Xlib_Graphics_Driver());
#endif
if (d != 1 && high_res) driver()->scale(d);
}
Fl_Xlib_Image_Surface_Driver::~Fl_Xlib_Image_Surface_Driver() {
#if FLTK_USE_CAIRO
if (shape_data_) {
cairo_surface_t *surf;
cairo_pattern_get_surface(shape_data_->mask_pattern_, &surf);
unsigned char *bits = cairo_image_surface_get_data(surf);
cairo_pattern_destroy(shape_data_->mask_pattern_);
delete[] bits;
Pixmap p = cairo_xlib_surface_get_drawable(cairo_get_target(shape_data_->bg_cr));
XFreePixmap(fl_display, p);
cairo_destroy(shape_data_->bg_cr);
free(shape_data_);
}
cairo_destroy(cairo_);
#else
if (shape_data_) {
XFreePixmap(fl_display, shape_data_->background);
delete shape_data_->mask;
free(shape_data_);
}
#endif
if (offscreen && !external_offscreen) XFreePixmap(fl_display, (Pixmap)offscreen);
delete driver();
}
void Fl_Xlib_Image_Surface_Driver::set_current() {
Fl_Surface_Device::set_current();
pre_window = fl_window;
fl_window = offscreen;
#if FLTK_USE_CAIRO
((Fl_X11_Cairo_Graphics_Driver*)driver())->set_cairo(cairo_);
#endif
}
void Fl_Xlib_Image_Surface_Driver::translate(int x, int y) {
#if FLTK_USE_CAIRO
cairo_save(cairo_);
cairo_translate(cairo_, x, y);
#else
((Fl_Xlib_Graphics_Driver*)driver())->translate_all(x, y);
#endif
}
void Fl_Xlib_Image_Surface_Driver::untranslate() {
#if FLTK_USE_CAIRO
cairo_restore(cairo_);
#else
((Fl_Xlib_Graphics_Driver*)driver())->untranslate_all();
#endif
}
Fl_RGB_Image* Fl_Xlib_Image_Surface_Driver::image()
{
if (shape_data_) {
#if FLTK_USE_CAIRO
// draw above the secondary offscreen the main offscreen masked by mask_pattern_
cairo_t *c = ((Fl_Cairo_Graphics_Driver*)driver())->cr();
cairo_pattern_t *paint_pattern = cairo_pattern_create_for_surface(cairo_get_target(c));
cairo_set_source(shape_data_->bg_cr, paint_pattern);
cairo_mask(shape_data_->bg_cr, shape_data_->mask_pattern_);
cairo_pattern_destroy(paint_pattern);
// copy secondary offscreen to the main offscreen
cairo_pattern_t *pat = cairo_pattern_create_for_surface(cairo_get_target(shape_data_->bg_cr));
cairo_scale(c, shape_data_->scale, shape_data_->scale);
cairo_set_source(c, pat),
cairo_paint(c);
cairo_pattern_destroy(pat);
// delete secondary offscreen
cairo_surface_t *surf;
cairo_pattern_get_surface(shape_data_->mask_pattern_, &surf);
unsigned char *bits = cairo_image_surface_get_data(surf);
cairo_pattern_destroy(shape_data_->mask_pattern_);
delete[] bits;
Pixmap p = cairo_xlib_surface_get_drawable(cairo_get_target(shape_data_->bg_cr));
XFreePixmap(fl_display, p);
cairo_destroy(shape_data_->bg_cr);
#else // !FLTK_USE_CAIRO
// draw the main offscreen masked by shape_data_->mask above the background offscreen
int w, h;
printable_rect(&w, &h);
Fl_RGB_Image *img_main = Fl::screen_driver()->read_win_rectangle(0, 0, w, h, 0);
fl_window = shape_data_->background; // temporary change
Fl_RGB_Image *img_background = Fl::screen_driver()->read_win_rectangle(0, 0, w, h, 0);
fl_window = offscreen;
Fl_Image_Surface_Driver::copy_with_mask(shape_data_->mask,
(uchar*)img_background->array,
(uchar*)img_main->array,
3 * shape_data_->mask->w(), false);
delete img_main;
// copy background offscreen to main offscreen
float s = driver()->scale();
driver()->scale(1);
fl_draw_image(img_background->array, 0, 0,
img_background->data_w(), img_background->data_h());
driver()->scale(s);
delete img_background;
// delete background offscreen
XFreePixmap(fl_display, shape_data_->background);
delete shape_data_->mask;
#endif // FLTK_USE_CAIRO
free(shape_data_);
shape_data_ = NULL;
}
Fl_RGB_Image *image = Fl::screen_driver()->read_win_rectangle(0, 0, width, height, 0);
return image;
}
void Fl_Xlib_Image_Surface_Driver::end_current()
{
fl_window = pre_window;
Fl_Surface_Device::end_current();
}
#if FLTK_USE_CAIRO
void Fl_Xlib_Image_Surface_Driver::mask(const Fl_RGB_Image *mask) {
bool using_copy = false;
shape_data_ = (struct shape_data_type*)calloc(1, sizeof(struct shape_data_type));
int W, H;
cairo_t *c = ((Fl_Cairo_Graphics_Driver*)driver())->cr();
cairo_surface_t *c_surface = cairo_get_target(c);
W = cairo_xlib_surface_get_width(c_surface);
H = cairo_xlib_surface_get_height(c_surface);
if (W != mask->data_w() || H != mask->data_h()) {
Fl_RGB_Image *copy = (Fl_RGB_Image*)mask->copy(W, H);
mask = copy;
using_copy = true;
}
shape_data_->mask_pattern_ = Fl_Cairo_Graphics_Driver::calc_cairo_mask(mask);
//duplicate current offscreen content to new cairo_t* shape_data_->bg_cr
int width, height;
printable_rect(&width, &height);
Pixmap pxm = XCreatePixmap(fl_display, RootWindow(fl_display, fl_screen), W, H, fl_visual->depth);
cairo_surface_t *background = cairo_xlib_surface_create(fl_display, pxm, fl_visual->visual, W, H);
shape_data_->bg_cr = cairo_create(background);
cairo_surface_destroy(background);
cairo_surface_flush(c_surface);
cairo_pattern_t *pat = cairo_pattern_create_for_surface(c_surface);
cairo_set_source(shape_data_->bg_cr, pat),
cairo_paint(shape_data_->bg_cr);
cairo_pattern_destroy(pat);
shape_data_->scale = double(width) / W;
if (using_copy) delete mask;
}
#else
void Fl_Xlib_Image_Surface_Driver::mask(const Fl_RGB_Image *mask) {
shape_data_ = (struct shape_data_type*)calloc(1, sizeof(struct shape_data_type));
// get dimensions
int W, H;
Fl::screen_driver()->offscreen_size(offscreen, W, H);
// compute depth-1 mask
shape_data_->mask = Fl_Image_Surface_Driver::RGB3_to_RGB1(mask, W, H);
// duplicate current offscreen content to new, background offscreen
shape_data_->background = XCreatePixmap(fl_display, RootWindow(fl_display, fl_screen), W, H, fl_visual->depth);
driver()->restore_clip();
XCopyArea(fl_display, (Pixmap)offscreen, shape_data_->background, (GC)driver()->gc(), 0, 0, W, H, 0, 0);
}
#endif // FLTK_USE_CAIRO
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