| /* |
| * 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 Decoding category of |
| * the macros used by the generic scaleloop function. |
| * |
| * This implementation can decode the pixel information associated |
| * with any Java DirectColorModel object. This implemenation will |
| * scale the decoded color components to 8-bit quantities if needed. |
| * Another file is provided to optimize DCM parsing when the masks |
| * are guaranteed to be at least 8-bits wide. This implementation |
| * examines some of the private fields of the DirectColorModel |
| * object and decodes the red, green, blue, and possibly alpha values |
| * directly rather than calling the getRGB method on the Java object. |
| */ |
| |
| /* |
| * These definitions vector the standard macro names to the "DCM" |
| * versions of those macros only if the "DecodeDeclared" keyword has |
| * not yet been defined elsewhere. The "DecodeDeclared" keyword is |
| * also defined here to claim ownership of the primary implementation |
| * even though this file does not rely on the definitions in any other |
| * files. |
| */ |
| #ifndef DecodeDeclared |
| #define DeclareDecodeVars DeclareDCMVars |
| #define InitPixelDecode(CM) InitPixelDCM(unhand(CM)) |
| #define PixelDecode PixelDCMDecode |
| #define DecodeDeclared |
| #endif |
| |
| #include "java_awt_image_DirectColorModel.h" |
| |
| #define DeclareDCMVars \ |
| IfAlpha(int alpha_mask; \ |
| int alpha_scale; \ |
| unsigned int alpha_off;) \ |
| int red_mask, green_mask, blue_mask; \ |
| int red_scale, green_scale, blue_scale; \ |
| unsigned int red_off, green_off, blue_off; \ |
| int scale; |
| |
| #define InitPixelDCM(CM) \ |
| do { \ |
| Classjava_awt_image_DirectColorModel *dcm = \ |
| (Classjava_awt_image_DirectColorModel *) CM; \ |
| red_mask = dcm->red_mask; \ |
| red_off = dcm->red_offset; \ |
| red_scale = dcm->red_scale; \ |
| green_mask = dcm->green_mask; \ |
| green_off = dcm->green_offset; \ |
| green_scale = dcm->green_scale; \ |
| blue_mask = dcm->blue_mask; \ |
| blue_off = dcm->blue_offset; \ |
| blue_scale = dcm->blue_scale; \ |
| IfAlpha(alpha_mask = dcm->alpha_mask; \ |
| alpha_off = dcm->alpha_offset; \ |
| alpha_scale = dcm->alpha_scale;) \ |
| scale = (red_scale | green_scale | blue_scale \ |
| IfAlpha(| alpha_scale)); \ |
| } while (0) |
| |
| #define PixelDCMDecode(CM, pixel, red, green, blue, alpha) \ |
| do { \ |
| IfAlpha(alpha = ((alpha_mask == 0) \ |
| ? 255 \ |
| : ((pixel & alpha_mask) >> alpha_off));) \ |
| red = ((pixel & red_mask) >> red_off); \ |
| green = ((pixel & green_mask) >> green_off); \ |
| blue = ((pixel & blue_mask) >> blue_off); \ |
| if (scale) { \ |
| if (red_scale) { \ |
| red = red * 255 / (red_scale); \ |
| } \ |
| if (green_scale) { \ |
| green = green * 255 / (green_scale); \ |
| } \ |
| if (blue_scale) { \ |
| blue = blue * 255 / (blue_scale); \ |
| } \ |
| IfAlpha(if (alpha_scale) { \ |
| alpha = alpha * 255 / (alpha_scale); \ |
| }) \ |
| } \ |
| } while (0) |
