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/*******************************************************************************
* apps/graphics/traveler/src/trv_pcx.c
* PCX graphic file support
*
* Copyright (C) 2014 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <gnutt@nuttx.org>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
*
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
* 3. Neither the name NuttX nor the names of its contributors may be
* used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
****************************************************************************/
/****************************************************************************
* Included files
****************************************************************************/
#include "trv_types.h"
#include "trv_mem.h"
#include "trv_color.h"
#include "trv_bitmaps.h"
#include "trv_graphicfile.h"
#include "trv_pcx.h"
#include <stdio.h>
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: trv_load_pcxheader
*
* Description:
*
***************************************************************************/
static void trv_load_pcxheader(FAR FILE *fp, struct pcx_header_s *header)
{
FAR uint8_t *tmpbuffer;
int i;
/* Load the header */
tmpbuffer = (FAR uint8_t*)header;
for (i = 0; i < SIZEOF_PCX_HEADER; i++)
{
tmpbuffer[i] = getc(fp);
}
}
/****************************************************************************
* Name: trv_load_pcxdata
*
* Description:
*
***************************************************************************/
static void trv_load_pcxdata(FAR FILE *fp, int32_t imagesize,
FAR uint8_t *imagebuffer)
{
uint32_t count;
int16_t nbytes;
uint8_t data;
count = 0;
while(count <= imagesize)
{
/* Get the first piece of data */
data = getc(fp);
/* Is this a run length encoding? */
if ((data >= 192) /* && (data <= 255) */)
{
/* How many bytes in run? */
nbytes = data - 192;
/* Get the actual data for the run */
data = getc(fp);
/* Replicate data in buffer nbytes times */
while(nbytes-- > 0)
{
imagebuffer[count++] = data;
}
}
else
{
/* Actual data, just copy it into buffer at next location */
imagebuffer[count++] = data;
}
}
}
/****************************************************************************
* Name: trv_load_pcxpalette
*
* Description:
*
***************************************************************************/
static void trv_load_pcxpalette(FAR FILE *fp,
FAR struct trv_color_rgb_s *palette)
{
int i;
/* Move to end of file then back up 768 bytes i.e. to beginning of palette */
(void)fseek(fp, -768L, SEEK_END);
/* Load the PCX palette into the palette structure */
for (i = 0; i < 256; i++)
{
/* Get the RGB components */
palette[i].red = getc(fp);
palette[i].green = getc(fp);
palette[i].blue = getc(fp);
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: trv_load_pcx
*
* Description:
* This function loads a PCX file into a memory.
*
***************************************************************************/
FAR struct trv_graphicfile_s *trv_load_pcx(FAR FILE *fp,
FAR const char *filename)
{
struct pcx_header_s header;
FAR trv_pixel_t *buffer;
FAR struct trv_graphicfile_s *gfile;
FAR struct trv_color_rgb_s *palette;
uint16_t imagewidth;
uint16_t imageheight;
uint32_t imagesize;
/* Load the PCX Header */
trv_load_pcxheader(fp, &header);
/* Allocate Space to hold the image data */
imagewidth = header.width - header.x + 1;
imageheight = header.height - header.y + 1;
imagesize = imageheight * imagewidth * sizeof(trv_pixel_t);
buffer = (FAR trv_pixel_t*)trv_malloc(imagesize + 1);
/* Load the PCX data into the buffer */
trv_load_pcxdata(fp, imagesize, (FAR uint8_t*)buffer);
/* Allocate space to hold the PCX palette */
palette = (struct trv_color_rgb_s*)
trv_malloc(sizeof(struct trv_color_rgb_s) * 256);
gfile = NULL;
if (palette)
{
/* Load the PCX palette */
trv_load_pcxpalette(fp, palette);
/* Now save the resulting data in a struct trv_graphicfile_s structure */
gfile = trv_graphicfile_new();
if (gfile)
{
gfile->palette = palette;
gfile->width = imagewidth;
gfile->height = imageheight;
gfile->bitmap = buffer;
}
}
return gfile;
}
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