| /* |
| * Copyright (c) 1996, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code 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 General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| /* |
| * This file contains macro definitions for the Scaling category of |
| * the macros used by the generic scaleloop function. |
| * |
| * This implementation uses a simple equation which simply chooses |
| * the closest input pixel to the location which is obtained from |
| * mapping inversely from the output rectangle to the input rectangle. |
| * The input pixels will be replicated when scaling larger than the |
| * original image size since the same input pixel will be chosen for |
| * more than one output pixel. Conversely, when scaling smaller than |
| * the original image size, the input pixels will be omitted as needed |
| * to pare them down to the required number of samples for the output |
| * image. If there is no scaling occuring in one or both directions |
| * the macros attempt to short-circuit most of the more complicated |
| * calculations in an attempt to impose little cost for using this |
| * implementation in the general case. The calculations also do not |
| * impose any restrictions on the order of delivery of the pixels. |
| * |
| * This file can be used to provide the default implementation of the |
| * Scaling macros, handling both scaled and unscaled cases and any |
| * order of pixel delivery. |
| */ |
| |
| #define DeclareScaleVars \ |
| int dstX1, dstY1, dstX, dstY, dstX2, dstY2; \ |
| int srcX1, srcXinc, srcXrem, srcXincrem, srcX1increm; \ |
| int srcX, srcY, inputadjust; |
| |
| #define SRCX srcX |
| #define SRCY srcY |
| #define DSTX dstX |
| #define DSTY dstY |
| #define DSTX1 dstX1 |
| #define DSTY1 dstY1 |
| #define DSTX2 dstX2 |
| #define DSTY2 dstY2 |
| |
| #define InitScale(pixels, srcOff, srcScan, \ |
| srcOX, srcOY, srcW, srcH, \ |
| srcTW, srcTH, dstTW, dstTH) \ |
| do { \ |
| inputadjust = srcScan; \ |
| if (srcTW == dstTW) { \ |
| inputadjust -= srcW; \ |
| dstX1 = srcOX; \ |
| dstX2 = srcOX + srcW; \ |
| } else { \ |
| dstX1 = DEST_XY_RANGE_START(srcOX, srcTW, dstTW); \ |
| dstX2 = DEST_XY_RANGE_START(srcOX+srcW, srcTW, dstTW); \ |
| if (dstX2 <= dstX1) { \ |
| return SCALENOOP; \ |
| } \ |
| srcX1 = SRC_XY(dstX1, srcTW, dstTW); \ |
| srcXinc = srcTW / dstTW; \ |
| srcXrem = (2 * srcTW) % (2 * dstTW); \ |
| srcX1increm = (((2 * (dstX1) * (srcTW)) + (srcTW)) \ |
| % (2 * (dstTW))); \ |
| } \ |
| if (srcTH == dstTH) { \ |
| dstY1 = srcOY; \ |
| dstY2 = srcOY + srcH; \ |
| SetInputRow(pixels, srcOff, srcScan, srcOY, srcOY); \ |
| } else { \ |
| dstY1 = DEST_XY_RANGE_START(srcOY, srcTH, dstTH); \ |
| dstY2 = DEST_XY_RANGE_START(srcOY+srcH, srcTH, dstTH); \ |
| if (dstY2 <= dstY1) { \ |
| return SCALENOOP; \ |
| } \ |
| } \ |
| } while (0) |
| |
| #define RowLoop(srcOY) \ |
| for (dstY = dstY1; dstY < dstY2; dstY++) |
| |
| #define RowSetup(srcTH, dstTH, srcTW, dstTW, \ |
| srcOY, pixels, srcOff, srcScan) \ |
| do { \ |
| if (srcTH == dstTH) { \ |
| srcY = dstY; \ |
| } else { \ |
| srcY = SRC_XY(dstY, srcTH, dstTH); \ |
| SetInputRow(pixels, srcOff, srcScan, srcY, srcOY); \ |
| } \ |
| if (srcTW != dstTW) { \ |
| srcXincrem = srcX1increm; \ |
| srcX = srcX1; \ |
| } \ |
| } while (0) |
| |
| #define ColLoop(srcOX) \ |
| for (dstX = dstX1; dstX < dstX2; dstX++) |
| |
| #define ColSetup(srcTW, dstTW, pixel) \ |
| do { \ |
| if (srcTW == dstTW) { \ |
| srcX = dstX; \ |
| pixel = GetPixelInc(); \ |
| } else { \ |
| pixel = GetPixel(srcX); \ |
| srcX += srcXinc; \ |
| srcXincrem += srcXrem; \ |
| if (srcXincrem >= (2 * dstTW)) { \ |
| srcXincrem -= (2 * dstTW); \ |
| srcX++; \ |
| } \ |
| } \ |
| } while (0) |
| |
| #define RowEnd(srcTH, dstTH, srcW, srcScan) \ |
| do { \ |
| if (srcTH == dstTH) { \ |
| InputPixelInc(inputadjust); \ |
| } \ |
| } while (0) |
