File indexing completed on 2024-05-19 04:22:56
0001 0002 /* 0003 Copyright (c) 2003-2007 Clarence Dang <dang@kde.org> 0004 All rights reserved. 0005 0006 Redistribution and use in source and binary forms, with or without 0007 modification, are permitted provided that the following conditions 0008 are met: 0009 0010 1. Redistributions of source code must retain the above copyright 0011 notice, this list of conditions and the following disclaimer. 0012 2. Redistributions in binary form must reproduce the above copyright 0013 notice, this list of conditions and the following disclaimer in the 0014 documentation and/or other materials provided with the distribution. 0015 0016 THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 0017 IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 0018 OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 0019 IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 0020 INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 0021 NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 0022 DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 0023 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 0024 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 0025 THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 0026 */ 0027 0028 0029 #define DEBUG_KP_PIXMAP_FX 0 0030 0031 0032 #include "kpEffectGrayscale.h" 0033 0034 #include "pixmapfx/kpPixmapFX.h" 0035 0036 0037 static QRgb toGray (QRgb rgb) 0038 { 0039 // naive way that doesn't preserve brightness 0040 // int gray = (qRed (rgb) + qGreen (rgb) + qBlue (rgb)) / 3; 0041 0042 // over-exaggerates red & blue 0043 // int gray = qGray (rgb); 0044 0045 int gray = (212671 * qRed (rgb) + 715160 * qGreen (rgb) + 72169 * qBlue (rgb)) / 1000000; 0046 return qRgba (gray, gray, gray, qAlpha (rgb)); 0047 } 0048 0049 0050 // public static 0051 kpImage kpEffectGrayscale::applyEffect (const kpImage &image) 0052 { 0053 kpImage qimage(image); 0054 0055 // TODO: Why not just write to the kpImage directly? 0056 if (qimage.depth () > 8) 0057 { 0058 for (int y = 0; y < qimage.height (); y++) 0059 { 0060 for (int x = 0; x < qimage.width (); x++) 0061 { 0062 qimage.setPixel (x, y, toGray (qimage.pixel (x, y))); 0063 } 0064 } 0065 } 0066 else 0067 { 0068 // 1- & 8- bit images use a color table 0069 for (int i = 0; i < qimage.colorCount (); i++) { 0070 qimage.setColor (i, toGray (qimage.color (i))); 0071 } 0072 } 0073 0074 return qimage; 0075 }