fbd01308b9
git-svn-id: file:///fltk/svn/fltk/branches/branch-1.1@5614 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
138 lines
4.0 KiB
C++
138 lines
4.0 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 1998-2006 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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// warning: this function is only implemented in Quickdraw. The function
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// below may not work If FLTK is compiled with Quartz enabled
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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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Rect src, // Source rectangle
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dst; // Destination rectangle
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GWorldPtr osbuffer; // Temporary off-screen buffer for copy
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GrafPtr srcPort; // Source port
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RGBColor rgb; // RGB colors for copy mask...
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PixMapHandle pm; // Pixmap handle for off-screen buffer
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uchar *base, // Base address of off-screen buffer
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*psrc, // Pointer into off-screen buffer
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*pdst; // Pointer into pixel buffer
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int idx, idy; // Current X & Y in image
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int d; // Depth of image
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int rowBytes; // Number of bytes per row...
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// Set the source and destination rectangles...
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src.top = y;
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src.left = x;
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src.bottom = y + h;
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src.right = x + w;
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dst.top = 0;
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dst.left = 0;
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dst.bottom = h;
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dst.right = w;
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// Get an off-screen buffer for copying the image...
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QDErr err = NewGWorld(&osbuffer, 0, &dst, 0L, 0L, 0);
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if (!osbuffer) return 0;
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if (err!=noErr) {
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DisposeGWorld(osbuffer);
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return 0;
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}
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// Get the source port...
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GetPort(&srcPort);
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// Set the RGB copy mask via the foreground/background colors...
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rgb.red = 0xffff;
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rgb.green = 0xffff;
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rgb.blue = 0xffff;
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RGBBackColor(&rgb);
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rgb.red = 0x0000;
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rgb.green = 0x0000;
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rgb.blue = 0x0000;
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RGBForeColor(&rgb);
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// Copy the screen image to the off-screen buffer...
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CopyBits(GetPortBitMapForCopyBits(srcPort),
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GetPortBitMapForCopyBits(osbuffer), &src, &dst, srcCopy, 0L);
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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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// Set the correct port for the off-screen buffer and lock the buffer
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SetGWorld(osbuffer, 0);
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pm = GetGWorldPixMap(osbuffer);
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LockPixels(pm);
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base = (uchar *)GetPixBaseAddr(pm);
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rowBytes = (*pm)->rowBytes & 0x3fff;
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// Copy the image from the off-screen buffer to the memory buffer.
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for (idy = 0, pdst = p; idy < h; idy ++)
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#ifdef __i386__
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for (idx = 0, psrc = base + idy * rowBytes; idx < w; idx ++, psrc += 4, pdst += d) {
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pdst[0] = psrc[2];
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pdst[1] = psrc[1];
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pdst[2] = psrc[0];
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}
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#else
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for (idx = 0, psrc = base + idy * rowBytes + 1; idx < w; idx ++, psrc += 4, pdst += d) {
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pdst[0] = psrc[0];
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pdst[1] = psrc[1];
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pdst[2] = psrc[2];
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}
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#endif // __i386__
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// Unlock and delete the off-screen buffer, then return...
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UnlockPixels(pm);
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DisposeGWorld(osbuffer);
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SetPort(srcPort);
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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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