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/* Copyright 2011-2014 Pierre Ossman for Cendio AB
*
* This is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This software is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this software; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307,
* USA.
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <assert.h>
#include <ApplicationServices/ApplicationServices.h>
#include <FL/Fl_Window.H>
#include <FL/x.H>
#include <rfb/LogWriter.h>
#include <rfb/Exception.h>
#include "OSXPixelBuffer.h"
using namespace rfb;
static rfb::LogWriter vlog("OSXPixelBuffer");
OSXPixelBuffer::OSXPixelBuffer(int width, int height) :
PlatformPixelBuffer(rfb::PixelFormat(32, 24, false, true,
255, 255, 255, 16, 8, 0),
width, height, NULL, width),
bitmap(NULL)
{
CGColorSpaceRef lut;
data = new rdr::U8[width * height * format.bpp/8];
if (data == NULL)
throw rfb::Exception("Error: Not enough memory for framebuffer");
lut = CGColorSpaceCreateDeviceRGB();
assert(lut);
bitmap = CGBitmapContextCreate(data, width, height, 8, width*4, lut,
kCGImageAlphaNoneSkipFirst | kCGBitmapByteOrder32Little);
assert(bitmap);
CGColorSpaceRelease(lut);
}
OSXPixelBuffer::~OSXPixelBuffer()
{
CFRelease((CGContextRef)bitmap);
delete [] data;
}
void OSXPixelBuffer::draw(int src_x, int src_y, int x, int y, int w, int h)
{
CGRect rect;
CGContextRef gc;
CGAffineTransform at;
CGImageRef image;
gc = (CGContextRef)fl_gc;
CGContextSaveGState(gc);
// We have to use clipping to partially display an image
rect.origin.x = x - 0.5;
rect.origin.y = y - 0.5;
rect.size.width = w;
rect.size.height = h;
CGContextClipToRect(gc, rect);
// Oh the hackiness that is OS X image handling...
// The CGContextDrawImage() routine magically flips the images and offsets
// them by 0.5,0.5 in order to compensate for OS X unfamiliar coordinate
// system. But this breaks horribly when you set up the CTM to get the
// more familiar top-down system (which FLTK does), meaning we have to
// reset the CTM back to the identity matrix and calculate new origin
// coordinates.
at = CGContextGetCTM(gc);
CGContextScaleCTM(gc, 1, -1);
CGContextTranslateCTM(gc, -at.tx, -at.ty);
rect.origin.x = x - src_x;
rect.origin.y = Fl_Window::current()->h() - (y - src_y);
rect.size.width = width();
rect.size.height = -height(); // Negative height does _not_ flip the image
image = CGBitmapContextCreateImage((CGContextRef)bitmap);
CGContextDrawImage(gc, rect, image);
CGImageRelease(image);
CGContextRestoreGState(gc);
}
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