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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_Wayland_Graphics_Driver.H"
#include "Fl_Wayland_Window_Driver.H"
#include "Fl_Wayland_Image_Surface_Driver.H"
Fl_Wayland_Image_Surface_Driver::Fl_Wayland_Image_Surface_Driver(int w, int h,
int high_res, Fl_Offscreen off) : Fl_Image_Surface_Driver(w, h, high_res, off) {
shape_data_ = NULL;
float s = 1;
int d = 1;
if (!off) {
fl_open_display();
if (Fl::first_window()) {
d = Fl_Wayland_Window_Driver::driver(Fl::first_window())->wld_scale();
}
s = Fl_Graphics_Driver::default_driver().scale();
if (d*s != 1 && high_res) {
w = int(w * s) * d;
h = int(h * s) * d;
}
struct Fl_Wayland_Graphics_Driver::draw_buffer *off_ =
(struct Fl_Wayland_Graphics_Driver::draw_buffer*)calloc(1,
sizeof(struct Fl_Wayland_Graphics_Driver::draw_buffer));
Fl_Wayland_Graphics_Driver::cairo_init(off_, w, h,
cairo_format_stride_for_width(CAIRO_FORMAT_RGB24, w), CAIRO_FORMAT_RGB24);
offscreen = (Fl_Offscreen)off_->cairo_;
cairo_set_user_data(off_->cairo_, &Fl_Wayland_Graphics_Driver::key, off_, NULL);
if (d*s != 1 && high_res) cairo_scale((cairo_t*)offscreen, d*s, d*s);
}
driver(new Fl_Wayland_Graphics_Driver());
if (d*s != 1 && high_res) driver()->scale(d*s);
}
Fl_Wayland_Image_Surface_Driver::~Fl_Wayland_Image_Surface_Driver() {
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;
struct Fl_Wayland_Graphics_Driver::draw_buffer *off_ =
Fl_Wayland_Graphics_Driver::offscreen_buffer((Fl_Offscreen)shape_data_->bg_cr);
delete[] off_->buffer;
free(off_);
cairo_destroy(shape_data_->bg_cr);
free(shape_data_);
}
if (offscreen && !external_offscreen) {
struct Fl_Wayland_Graphics_Driver::draw_buffer *buffer =
Fl_Wayland_Graphics_Driver::offscreen_buffer(offscreen);
cairo_destroy((cairo_t *)offscreen);
delete[] buffer->buffer;
free(buffer);
}
delete driver();
}
void Fl_Wayland_Image_Surface_Driver::set_current() {
Fl_Surface_Device::set_current();
Fl_Cairo_Graphics_Driver *dr = (Fl_Cairo_Graphics_Driver*)driver();
if (!dr->cr()) dr->set_cairo((cairo_t*)offscreen);
pre_window = Fl_Wayland_Window_Driver::wld_window;
Fl_Wayland_Window_Driver::wld_window = NULL;
fl_window = 0;
}
void Fl_Wayland_Image_Surface_Driver::end_current() {
cairo_surface_t *surf = cairo_get_target((cairo_t*)offscreen);
cairo_surface_flush(surf);
Fl_Wayland_Window_Driver::wld_window = pre_window;
fl_window = (Window)pre_window;
Fl_Surface_Device::end_current();
}
void Fl_Wayland_Image_Surface_Driver::translate(int x, int y) {
((Fl_Wayland_Graphics_Driver*)driver())->ps_translate(x, y);
}
void Fl_Wayland_Image_Surface_Driver::untranslate() {
((Fl_Wayland_Graphics_Driver*)driver())->ps_untranslate();
}
Fl_RGB_Image* Fl_Wayland_Image_Surface_Driver::image() {
if (shape_data_ && shape_data_->mask_pattern_) {
// 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;
struct Fl_Wayland_Graphics_Driver::draw_buffer *off_ =
Fl_Wayland_Graphics_Driver::offscreen_buffer((Fl_Offscreen)shape_data_->bg_cr);
delete[] off_->buffer;
free(off_);
cairo_destroy(shape_data_->bg_cr);
free(shape_data_);
shape_data_ = NULL;
}
// Convert depth-4 image in draw_buffer to a depth-3 image while exchanging R and B colors
struct Fl_Wayland_Graphics_Driver::draw_buffer *off_buf =
Fl_Wayland_Graphics_Driver::offscreen_buffer(offscreen);
int height = int(off_buf->data_size / off_buf->stride);
uchar *rgb = new uchar[off_buf->width * height * 3];
uchar *p = rgb;
uchar *q;
for (int j = 0; j < height; j++) {
q = off_buf->buffer + j*off_buf->stride;
for (int i = 0; i < off_buf->width; i++) { // exchange R and B colors, transmit G
*p = *(q+2);
*(p+1) = *(q+1);
*(p+2) = *q;
p += 3; q += 4;
}
}
Fl_RGB_Image *image = new Fl_RGB_Image(rgb, off_buf->width, height, 3);
image->alloc_array = 1;
return image;
}
void Fl_Wayland_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;
struct Fl_Wayland_Graphics_Driver::draw_buffer *off_buf =
Fl_Wayland_Graphics_Driver::offscreen_buffer(offscreen);
W = off_buf->width;
H = (int)(off_buf->data_size / off_buf->stride);
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);
struct Fl_Wayland_Graphics_Driver::draw_buffer *off_ =
(struct Fl_Wayland_Graphics_Driver::draw_buffer*)calloc(1,
sizeof(struct Fl_Wayland_Graphics_Driver::draw_buffer));
Fl_Wayland_Graphics_Driver::cairo_init(off_, W, H,
cairo_format_stride_for_width(CAIRO_FORMAT_RGB24, W),
CAIRO_FORMAT_RGB24);
cairo_set_user_data(off_->cairo_, &Fl_Wayland_Graphics_Driver::key, off_, NULL);
shape_data_->bg_cr = off_->cairo_;
memcpy(off_->buffer, off_buf->buffer, off_buf->data_size);
shape_data_->scale = double(width) / W;
if (using_copy) delete mask;
}
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