8072ef8ce8
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.3@8362 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
83 lines
2.8 KiB
C++
83 lines
2.8 KiB
C++
//
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// "$Id$"
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//
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// WIN32 image reading routines for the Fast Light Tool Kit (FLTK).
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//
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// Copyright 1998-2010 by Bill Spitzak and others.
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Library General Public
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// License as published by the Free Software Foundation; either
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// version 2 of the License, or (at your option) any later version.
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//
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// This library is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Library General Public License for more details.
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//
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// You should have received a copy of the GNU Library General Public
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
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// USA.
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//
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// Please report all bugs and problems on the following page:
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//
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// http://www.fltk.org/str.php
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//
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#include <config.h>
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//
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// 'fl_read_image()' - Read an image from the current window or off-screen buffer.
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//
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uchar * // O - Pixel buffer or NULL if failed
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fl_read_image(uchar *p, // I - Pixel buffer or NULL to allocate
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int x, // I - Left position
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int y, // I - Top position
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int w, // I - Width of area to read
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int h, // I - Height of area to read
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int alpha) { // I - Alpha value for image (0 for none)
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uchar *base;
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int rowBytes, delta;
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if(fl_window == NULL) { // reading from an offscreen buffer
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CGContextRef src = (CGContextRef)fl_gc; // get bitmap context
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base = (uchar *)CGBitmapContextGetData(src); // get data
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if(!base) return NULL;
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int sw = CGBitmapContextGetWidth(src);
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int sh = CGBitmapContextGetHeight(src);
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rowBytes = CGBitmapContextGetBytesPerRow(src);
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delta = CGBitmapContextGetBitsPerPixel(src)/8;
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if( (sw - x < w) || (sh - y < h) ) return NULL;
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}
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else { // reading from current window
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Fl_Window *window = Fl_Window::current();
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while(window->window()) window = window->window();
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base = Fl_X::bitmap_from_window_rect(window,x,y,w,h,&delta);
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rowBytes = delta*w;
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x = y = 0;
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}
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// Allocate the image data array as needed...
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int d = alpha ? 4 : 3;
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if (!p) p = new uchar[w * h * d];
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// Initialize the default colors/alpha in the whole image...
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memset(p, alpha, w * h * d);
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// Copy the image from the off-screen buffer to the memory buffer.
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int idx, idy; // Current X & Y in image
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uchar *pdst, *psrc;
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for (idy = y, pdst = p; idy < h + y; idy ++) {
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for (idx = 0, psrc = base + idy * rowBytes + x * delta; idx < w; idx ++, psrc += delta, pdst += d) {
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pdst[0] = psrc[0]; // R
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pdst[1] = psrc[1]; // G
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pdst[2] = psrc[2]; // B
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}
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}
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if(fl_window != NULL) delete[] base;
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return p;
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}
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//
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// End of "$Id$".
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//
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