/*
* 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
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*/
/*
* 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 implementation 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
#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)