diff options
Diffstat (limited to 'apps/graphics/traveler/src/trv_graphicfile.c')
-rw-r--r-- | apps/graphics/traveler/src/trv_graphicfile.c | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/apps/graphics/traveler/src/trv_graphicfile.c b/apps/graphics/traveler/src/trv_graphicfile.c new file mode 100644 index 000000000..4e598fd58 --- /dev/null +++ b/apps/graphics/traveler/src/trv_graphicfile.c @@ -0,0 +1,167 @@ +/******************************************************************************* + * apps/graphics/traveler/src/trv_graphicfile.c + * Load image from a graphic file + * + * 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_pcx.h" +#include "trv_graphicfile.h" + +#include <stdio.h> +#include <errno.h> + +/**************************************************************************** + * Public Functions + ****************************************************************************/ + +/**************************************************************************** + * Name: tvr_graphicfile_read + * + * Description: + * Read a bitmap texture from a graphic file + * + * NOTE: This function exists only as extension pointer where additional + * graphic file formats can be supported. Currently only the ancient + * PCX format is supported. + * + ***************************************************************************/ + +FAR struct trv_graphicfile_s *tvr_graphicfile_read(char *filename) +{ + FAR struct trv_graphicfile_s *gfile = NULL; + FAR FILE *fp; + + /* Open the graphic file for reading */ + + fp = fopen(filename, "rb"); + if (fp == NULL) + { + int errcode = errno; + fprintf(stderr, "ERROR: Failed to open graphic file %s: %d\n", + filename, errcode); + return NULL; + } + + /* Load the graphic file into memory. + * + * REVISIT: Here would be the place where we would decide on the format of + * the graphic file. Here we just assume that the file is PCX. + */ + + gfile = trv_load_pcx(fp, filename); + if (gfile == NULL) + { + fprintf(stderr, "ERROR: Failed to load graphic file %s\n", filename); + } + + fclose(fp); + return gfile; +} + +/************************************************************************* + * Name: trv_graphicfile_new + * + * Description: + * Allocate a new graphic file structure + * + ************************************************************************/ + +FAR struct trv_graphicfile_s *trv_graphicfile_new(void) +{ + FAR struct trv_graphicfile_s *gfile; + + + gfile = (FAR struct trv_graphicfile_s*) + trv_malloc(sizeof(struct trv_graphicfile_s)); + if (gfile) + { + gfile->transparent_entry = -1; + } + + return gfile; +} + +/************************************************************************* + * Name: trv_graphicfile_free + * + * Description: + * Free the graphic file structure after also freeing in additional + * resources attached to the structure. + + ************************************************************************/ + +void trv_graphicfile_free(FAR struct trv_graphicfile_s *gfile) +{ + if (gfile != NULL) + { + if (gfile->palette != NULL) + { + trv_free(gfile->palette); + } + + if (gfile->bitmap != NULL) + { + trv_free(gfile->bitmap); + } + + trv_free(gfile); + } +} + +/************************************************************************* + * Name: trv_graphicfile_pixel + * + * Description: + * Return the RGB color value for a pixel at location (x,y) in the + * texture bitmap. + * + ************************************************************************/ + +struct trv_color_rgb_s +trv_graphicfile_pixel(FAR struct trv_graphicfile_s *gfile, int x, int y) +{ + /* REVISIT: This only works for paletted graphics files like PCX. + * For the paletted color, the color lookup values lies at the (x,y) + * position in the image. For a true color image, the RGB value would + * lie at the (x,y) position, + */ + + int ndx = gfile->bitmap[y * gfile->width + x]; + return gfile->palette[ndx]; +} |