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//
// "$Id$"
//
// Rectangle drawing routines 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 "../../config_lib.h"
#include "Fl_Quartz_Graphics_Driver.h"
const char *Fl_Quartz_Graphics_Driver::class_id = "Fl_Quartz_Graphics_Driver";
/* Reference to the current CGContext
For back-compatibility only. The preferred procedure to get this reference is
Fl_Surface_Device::surface()->driver()->get_gc().
*/
CGContextRef fl_gc = 0;
void Fl_Graphics_Driver::global_gc()
{
fl_gc = (CGContextRef)get_gc();
}
/*
* By linking this module, the following static method will instatiate the
* OS X Quartz Graphics driver as the main display driver.
*/
Fl_Graphics_Driver *Fl_Graphics_Driver::newMainGraphicsDriver()
{
return new Fl_Quartz_Graphics_Driver();
}
Fl_Offscreen Fl_Quartz_Graphics_Driver::create_offscreen_with_alpha(int w, int h) {
void *data = calloc(w*h,4);
CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(data, w, h, 8, w*4, lut, kCGImageAlphaPremultipliedLast);
CGColorSpaceRelease(lut);
return (Fl_Offscreen)ctx;
}
char Fl_Quartz_Graphics_Driver::can_do_alpha_blending() {
return 1;
}
static void bmProviderRelease (void *src, const void *data, size_t size) {
CFIndex count = CFGetRetainCount(src);
CFRelease(src);
if(count == 1) free((void*)data);
}
void Fl_Quartz_Graphics_Driver::copy_offscreen(int x,int y,int w,int h,Fl_Offscreen osrc,int srcx,int srcy) {
CGContextRef src = (CGContextRef)osrc;
void *data = CGBitmapContextGetData(src);
int sw = CGBitmapContextGetWidth(src);
int sh = CGBitmapContextGetHeight(src);
CGImageAlphaInfo alpha = CGBitmapContextGetAlphaInfo(src);
CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
// when output goes to a Quartz printercontext, release of the bitmap must be
// delayed after the end of the print page
CFRetain(src);
CGDataProviderRef src_bytes = CGDataProviderCreateWithData( src, data, sw*sh*4, bmProviderRelease);
CGImageRef img = CGImageCreate( sw, sh, 8, 4*8, 4*sw, lut, alpha,
src_bytes, 0L, false, kCGRenderingIntentDefault);
draw_CGImage(img, x, y, w, h, srcx, srcy, sw, sh);
CGImageRelease(img);
CGColorSpaceRelease(lut);
CGDataProviderRelease(src_bytes);
}
/** \addtogroup fl_drawings
@{
*/
// FIXME: driver system
/**
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) {
void *data = calloc(w*h,4);
CGColorSpaceRef lut = CGColorSpaceCreateDeviceRGB();
CGContextRef ctx = CGBitmapContextCreate(
data, w, h, 8, w*4, lut, kCGImageAlphaNoneSkipLast);
CGColorSpaceRelease(lut);
return (Fl_Offscreen)ctx;
}
// FIXME: driver system
/** Deletion of an offscreen graphics buffer.
\param ctx the buffer to be deleted.
*/
void fl_delete_offscreen(Fl_Offscreen ctx) {
if (!ctx) return;
void *data = CGBitmapContextGetData((CGContextRef)ctx);
CFIndex count = CFGetRetainCount(ctx);
CGContextRelease((CGContextRef)ctx);
if(count == 1) free(data);
}
// FIXME: driver system
const int stack_max = 16;
static int stack_ix = 0;
static CGContextRef stack_gc[stack_max];
static Window stack_window[stack_max];
static Fl_Surface_Device *_ss;
// FIXME: driver system
/** Send all subsequent drawing commands to this offscreen buffer.
\param ctx the offscreen buffer.
*/
void fl_begin_offscreen(Fl_Offscreen ctx) {
_ss = Fl_Surface_Device::surface();
Fl_Display_Device::display_device()->set_current();
if (stack_ix<stack_max) {
stack_gc[stack_ix] = (CGContextRef)fl_graphics_driver->get_gc();
stack_window[stack_ix] = fl_window;
} else
fprintf(stderr, "FLTK CGContext Stack overflow error\n");
stack_ix++;
fl_graphics_driver->set_gc(ctx);
fl_window = 0;
CGContextSaveGState(ctx);
fl_graphics_driver->push_no_clip();
}
// FIXME: driver system
/** Quit sending drawing commands to the current offscreen buffer.
*/
void fl_end_offscreen() {
fl_graphics_driver->pop_clip();
CGContextRef gc = (CGContextRef)fl_graphics_driver->get_gc();
CGContextRestoreGState(gc); // matches CGContextSaveGState in fl_begin_offscreen()
CGContextFlush(gc);
if (stack_ix>0)
stack_ix--;
else
fprintf(stderr, "FLTK CGContext Stack underflow error\n");
if (stack_ix<stack_max) {
fl_graphics_driver->set_gc(stack_gc[stack_ix]);
fl_window = stack_window[stack_ix];
}
_ss->set_current();
}
/** @} */
//
// End of "$Id$".
//
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