diff options
Diffstat (limited to 'apps/graphics/traveler/src/trv_pcx.c')
| -rw-r--r-- | apps/graphics/traveler/src/trv_pcx.c | 217 |
1 files changed, 217 insertions, 0 deletions
diff --git a/apps/graphics/traveler/src/trv_pcx.c b/apps/graphics/traveler/src/trv_pcx.c new file mode 100644 index 000000000..5ff2d0cb7 --- /dev/null +++ b/apps/graphics/traveler/src/trv_pcx.c @@ -0,0 +1,217 @@ +/******************************************************************************* + * 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; +} + |