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Viewing changes to nvidia-settings-1.0/src/image_data/image.c

  • Committer: Bazaar Package Importer
  • Author(s): Randall Donald
  • Date: 2004-07-03 19:09:17 UTC
  • Revision ID: james.westby@ubuntu.com-20040703190917-rqkze2s58ux5pamy
Tags: upstream-1.0
Import upstream version 1.0

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nvidia-settings-1.0/src/image_data/image.c
 
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/*
 
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 * nvidia-settings: A tool for configuring the NVIDIA X driver on Unix
 
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 * and Linux systems.
 
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 *
 
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 * Copyright (C) 2004 NVIDIA Corporation.
 
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 *
 
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 * This program is free software; you can redistribute it and/or
 
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 * modify it under the terms of Version 2 of the GNU General Public
 
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 * License as published by the Free Software Foundation.
 
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 *
 
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 * This program is distributed in the hope that it will be useful, but
 
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 * WITHOUT ANY WARRANTY; without even the implied warranty of
 
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See Version 2
 
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 * of the GNU General Public License for more details.
 
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 *
 
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 * You should have received a copy of the GNU General Public License
 
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 * along with this program; if not, write to the:
 
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 *
 
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 *           Free Software Foundation, Inc.
 
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 *           59 Temple Place - Suite 330
 
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 *           Boston, MA 02111-1307, USA
 
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 *
 
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 */
 
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/*
 
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 * This source file contains a simple routine for uncompressing RGB
 
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 * 1-byte-run-length-encoded images as generated by gimp when saving
 
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 * as "C-Source".
 
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 */
 
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#include "image.h"
 
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#include <stdlib.h>
 
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#include <string.h>
 
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#define GIMP_IMAGE_RUN_LENGTH_DECODE(image_buf, rle_data, size, bpp) \
 
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do {                                                                 \
 
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    unsigned int __bpp;                                              \
 
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    unsigned char *__ip;                                             \
 
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    const unsigned char *__il, *__rd;                                \
 
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                                                                     \
 
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    __bpp = (bpp);                                                   \
 
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    __ip = (image_buf);                                              \
 
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    __il = __ip + (size) * __bpp;                                    \
 
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    __rd = (rle_data);                                               \
 
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                                                                     \
 
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    if (__bpp > 3) { /* RGBA */                                      \
 
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        while (__ip < __il) {                                        \
 
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            unsigned int __l = *(__rd++);                            \
 
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            if (__l & 128) {                                         \
 
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                __l = __l - 128;                                     \
 
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                do {                                                 \
 
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                    memcpy (__ip, __rd, 4); __ip += 4;               \
 
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                } while (--__l);                                     \
 
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                __rd += 4;                                           \
 
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            } else {                                                 \
 
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                __l *= 4;                                            \
 
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                memcpy (__ip, __rd, __l);                            \
 
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                __ip += __l; __rd += __l;                            \
 
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            }                                                        \
 
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        }                                                            \
 
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    } else { /* RGB */                                               \
 
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        while (__ip < __il) {                                        \
 
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            unsigned int __l = *(__rd++);                            \
 
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            if (__l & 128) {                                         \
 
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                __l = __l - 128;                                     \
 
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                do {                                                 \
 
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                    memcpy (__ip, __rd, 3); __ip += 3;               \
 
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                } while (--__l); __rd += 3;                          \
 
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            } else {                                                 \
 
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                __l *= 3;                                            \
 
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                memcpy (__ip, __rd, __l);                            \
 
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                __ip += __l; __rd += __l;                            \
 
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            }                                                        \
 
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        }                                                            \
 
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    }                                                                \
 
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} while (0)
 
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unsigned char *decompress_image_data(const nv_image_t *img)
 
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{
 
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    unsigned char *buf = malloc(img->width *
 
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                                img->height *
 
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                                img->bytes_per_pixel);
 
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    GIMP_IMAGE_RUN_LENGTH_DECODE(buf, img->rle_pixel_data,
 
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                                 img->width * img->height,
 
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                                 img->bytes_per_pixel);
 
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    return buf;
 
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}
 
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void free_decompressed_image(unsigned char *buf, void *ptr)
 
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{
 
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    free(buf);
 
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}