6986a1d008
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5164 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
73 lines
2.1 KiB
C++
73 lines
2.1 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 1998-2005 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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//
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// 'fl_read_image()' - Read an image from the current window.
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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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int x, y; // Looping vars
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int d; // Depth of image
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uchar *ptr; // Pointer in image data
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// Allocate the image data array as needed...
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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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// Grab all of the pixels in the image, one at a time...
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// MRS: there has to be a better way than this!
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for (y = 0, ptr = p; y < h; y ++) {
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for (x = 0; x < w; x ++, ptr += d) {
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COLORREF c = GetPixel(fl_gc, X + x, Y + y);
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ptr[0] = (uchar)c;
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c >>= 8;
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ptr[1] = (uchar)c;
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c >>= 8;
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ptr[2] = (uchar)c;
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}
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}
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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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