ref: ce8b5651bc33720a4f34309c81d0b12d7ce5791e
dir: /DoConfig/fltk/src/fl_read_image_mac.cxx/
// // "$Id$" // // WIN32 image reading routines for the Fast Light Tool Kit (FLTK). // // Copyright 1998-2010 by Bill Spitzak and others. // // This library is free software. Distribution and use rights are outlined in // the file "COPYING" which should have been included with this file. If this // file is missing or damaged, see the license at: // // http://www.fltk.org/COPYING.php // // Please report all bugs and problems on the following page: // // http://www.fltk.org/str.php // #include <config.h> // // 'fl_read_image()' - Read an image from the current window or off-screen buffer. // 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) uchar *base; int rowBytes, delta; if(fl_window == NULL) { // reading from an offscreen buffer CGContextRef src = (CGContextRef)fl_gc; // get bitmap context base = (uchar *)CGBitmapContextGetData(src); // get data if(!base) return NULL; int sw = CGBitmapContextGetWidth(src); int sh = CGBitmapContextGetHeight(src); rowBytes = CGBitmapContextGetBytesPerRow(src); delta = CGBitmapContextGetBitsPerPixel(src)/8; if( (sw - x < w) || (sh - y < h) ) return NULL; } else { // reading from current window base = Fl_X::bitmap_from_window_rect(Fl_Window::current(),x,y,w,h,&delta); if (!base) return NULL; rowBytes = delta*w; x = y = 0; } // Allocate the image data array as needed... int 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); // Copy the image from the off-screen buffer to the memory buffer. int idx, idy; // Current X & Y in image uchar *pdst, *psrc; for (idy = y, pdst = p; idy < h + y; idy ++) { for (idx = 0, psrc = base + idy * rowBytes + x * delta; idx < w; idx ++, psrc += delta, pdst += d) { pdst[0] = psrc[0]; // R pdst[1] = psrc[1]; // G pdst[2] = psrc[2]; // B } } if(fl_window != NULL) delete[] base; return p; } // // End of "$Id$". //