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//
// "$Id$"
//
// WIN32 image reading routines for the Fast Light Tool Kit (FLTK).
//
// Copyright 1998-2005 by Bill Spitzak and others.
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Library General Public
// License as published by the Free Software Foundation; either
// version 2 of the License, or (at your option) any later version.
//
// This library 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
// Library General Public License for more details.
//
// You should have received a copy of the GNU Library General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
// USA.
//
// Please report all bugs and problems to "fltk-bugs@fltk.org".
//
#include <config.h>
// warning: this function is only implemented in Quickdraw. The function
// below may not work If FLTK is compiled with Quartz enabled
//
// 'fl_read_image()' - Read an image from the current window.
//
uchar * // O - Pixel buffer or NULL if failed
fl_read_image(uchar *p, // I - Pixel buffer or NULL to allocate
int x, // I - Left position
int y, // I - Top position
int w, // I - Width of area to read
int h, // I - Height of area to read
int alpha) { // I - Alpha value for image (0 for none)
Rect src, // Source rectangle
dst; // Destination rectangle
Fl_Offscreen osbuffer; // Temporary off-screen buffer for copy
GrafPtr srcPort; // Source port
RGBColor rgb; // RGB colors for copy mask...
PixMapHandle pm; // Pixmap handle for off-screen buffer
uchar *base, // Base address of off-screen buffer
*psrc, // Pointer into off-screen buffer
*pdst; // Pointer into pixel buffer
int idx, idy; // Current X & Y in image
int d; // Depth of image
int rowBytes; // Number of bytes per row...
// Get an off-screen buffer for copying the image...
osbuffer = fl_create_offscreen(w,h);
if (!osbuffer) return 0;
// Set the source and destination rectangles...
src.top = y;
src.left = x;
src.bottom = y + h;
src.right = x + w;
dst.top = 0;
dst.left = 0;
dst.bottom = h;
dst.right = w;
// Get the source port...
GetPort(&srcPort);
// Set the RGB copy mask via the foreground/background colors...
rgb.red = 0xffff;
rgb.green = 0xffff;
rgb.blue = 0xffff;
RGBBackColor(&rgb);
rgb.red = 0x0000;
rgb.green = 0x0000;
rgb.blue = 0x0000;
RGBForeColor(&rgb);
// Copy the screen image to the off-screen buffer...
CopyBits(GetPortBitMapForCopyBits(srcPort),
GetPortBitMapForCopyBits(osbuffer), &src, &dst, srcCopy, 0L);
// Allocate the image data array as needed...
d = alpha ? 4 : 3;
if (!p) p = new uchar[w * h * d];
// Initialize the default colors/alpha in the whole image...
memset(p, alpha, w * h * d);
// Set the correct port for the off-screen buffer and lock the buffer
SetGWorld(osbuffer, 0);
pm = GetGWorldPixMap(osbuffer);
LockPixels(pm);
base = (uchar *)GetPixBaseAddr(pm);
rowBytes = (*pm)->rowBytes & 0x3fff;
// Copy the image from the off-screen buffer to the memory buffer.
for (idy = 0, pdst = p; idy < h; idy ++)
for (idx = 0, psrc = base + idy * rowBytes + 1; idx < w; idx ++, psrc += 4, pdst += d) {
pdst[0] = psrc[0];
pdst[1] = psrc[1];
pdst[2] = psrc[2];
}
// Unlock and delete the off-screen buffer, then return...
UnlockPixels(pm);
fl_delete_offscreen(osbuffer);
return p;
}
//
// End of "$Id$".
//
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