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//
// Draw-to-image code for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2026 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/fl_draw.H>
#include "Fl_Quartz_Image_Surface_Driver.H"
#include "Fl_Quartz_Graphics_Driver.H"
#include "../Cocoa/Fl_Cocoa_Window_Driver.H"
#include <ApplicationServices/ApplicationServices.h>
Fl_Quartz_Image_Surface_Driver::Fl_Quartz_Image_Surface_Driver(int w, int h, int high_res, Fl_Offscreen off) : Fl_Image_Surface_Driver(w, h, high_res, off) {
mask_ = NULL;
int W = w, H = h;
float s = 1;
if (high_res) {
s = Fl_Graphics_Driver::default_driver().scale();
Fl_Window *cw = Fl::first_window();
Fl_Cocoa_Window_Driver *dr = cw ? Fl_Cocoa_Window_Driver::driver(cw) : NULL;
if (dr && dr->mapped_to_retina()) s *= 2;
W *= s; H *= s;
}
CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
offscreen = off ? off : (Fl_Offscreen)CGBitmapContextCreate(calloc(W*H,4), W, H, 8, W*4, lut, kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(lut);
driver(new Fl_Quartz_Graphics_Driver);
CGContextTranslateCTM((CGContextRef)offscreen, 0.5*s, -0.5*s); // as when drawing to a window
if (high_res) {
CGContextScaleCTM((CGContextRef)offscreen, s, s);
driver()->scale(s);
}
CGContextSetShouldAntialias((CGContextRef)offscreen, false);
CGContextTranslateCTM((CGContextRef)offscreen, 0, height);
CGContextScaleCTM((CGContextRef)offscreen, 1.0f, -1.0f);
CGContextSaveGState((CGContextRef)offscreen);
CGContextSetRGBFillColor((CGContextRef)offscreen, 1, 1, 1, 0);
CGContextFillRect((CGContextRef)offscreen, CGRectMake(0,0,w,h));
}
Fl_Quartz_Image_Surface_Driver::~Fl_Quartz_Image_Surface_Driver() {
if (mask_) {
CGImageRelease(mask_);
}
if (offscreen) CGContextRestoreGState((CGContextRef)offscreen);
if (offscreen && !external_offscreen) {
void *data = CGBitmapContextGetData((CGContextRef)offscreen);
free(data);
CGContextRelease((CGContextRef)offscreen);
}
delete driver();
}
void Fl_Quartz_Image_Surface_Driver::set_current() {
Fl_Surface_Device::set_current();
pre_window = fl_window;
driver()->gc((CGContextRef)offscreen);
fl_window = 0;
((Fl_Quartz_Graphics_Driver*)driver())->high_resolution( CGBitmapContextGetWidth((CGContextRef)offscreen) > (size_t)width );
if (mask_) {
int W, H;
printable_rect(&W, &H);
CGContextSaveGState((CGContextRef)offscreen);
CGContextClipToMask((CGContextRef)offscreen, CGRectMake(0,0,W,H), mask_); // 10.4
CGContextSaveGState((CGContextRef)offscreen);
}
}
void Fl_Quartz_Image_Surface_Driver::translate(int x, int y) {
CGContextRestoreGState((CGContextRef)offscreen);
CGContextSaveGState((CGContextRef)offscreen);
CGContextTranslateCTM((CGContextRef)offscreen, x, y);
CGContextSaveGState((CGContextRef)offscreen);
}
void Fl_Quartz_Image_Surface_Driver::untranslate() {
CGContextRestoreGState((CGContextRef)offscreen);
}
Fl_RGB_Image* Fl_Quartz_Image_Surface_Driver::image()
{
CGContextFlush((CGContextRef)offscreen);
if (mask_) {
CGContextRestoreGState((CGContextRef)offscreen);
CGImageRelease(mask_);
mask_ = NULL;
}
int W = (int)CGBitmapContextGetWidth((CGContextRef)offscreen);
int H = (int)CGBitmapContextGetHeight((CGContextRef)offscreen);
int bpr = (int)CGBitmapContextGetBytesPerRow((CGContextRef)offscreen);
int bpp = (int)CGBitmapContextGetBitsPerPixel((CGContextRef)offscreen)/8;
uchar *base = (uchar*)CGBitmapContextGetData((CGContextRef)offscreen);
int idx, idy;
uchar *pdst, *psrc;
unsigned char *data = new uchar[W * H * 3];
for (idy = 0, pdst = data; idy < H; idy ++) {
for (idx = 0, psrc = base + idy * bpr; idx < W; idx ++, psrc += bpp, pdst += 3) {
pdst[0] = psrc[0]; // R
pdst[1] = psrc[1]; // G
pdst[2] = psrc[2]; // B
}
}
Fl_RGB_Image *image = new Fl_RGB_Image(data, W, H);
image->alloc_array = 1;
return image;
}
void Fl_Quartz_Image_Surface_Driver::end_current()
{
if (mask_) {
CGContextRestoreGState((CGContextRef)offscreen);
CGContextRestoreGState((CGContextRef)offscreen);
}
fl_window = pre_window;
Fl_Surface_Device::end_current();
}
static void MyProviderReleaseData (void *info, const void *data, size_t size) {
delete[] (uchar*)data;
}
void Fl_Quartz_Image_Surface_Driver::mask(const Fl_RGB_Image *img) {
if (!&CGContextClipToMask) return;
int W = (int)CGBitmapContextGetWidth((CGContextRef)offscreen);
int H = (int)CGBitmapContextGetHeight((CGContextRef)offscreen);
bool using_copy = false;
if (W != img->data_w() || H != img->data_h()) {
Fl_RGB_Image *copy = (Fl_RGB_Image*)img->copy(W, H);
img = copy;
using_copy = true;
}
int i, d = img->d(), w = img->data_w(), h = img->data_h();
// reverse top and bottom and convert to gray scale if img->d() == 3 and complement bits
int bytes_per_row = (img->ld() ? img->ld() : w * d);
uchar *from = new uchar[w * h];
for ( i = 0; i < h; i++) {
const uchar *p = img->array + bytes_per_row * i;
const uchar *last = p + bytes_per_row;
uchar *q = from + (h - 1 - i) * w;
while (p < last) {
unsigned u = *p++;
u += *p++;
u += *p++;
*q++ = ~(u/3);
}
}
CGDataProviderRef provider = CGDataProviderCreateWithData(NULL, from, w * h, MyProviderReleaseData);
mask_ = CGImageMaskCreate(w, h, 8, 8, w, provider, NULL, false);
CFRelease(provider);
if (using_copy) delete img;
}
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