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/*******************************************************************************
* apps/graphics/traveler/src/trv_texturefile.c
*
* 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_bitmaps.h"
#include "trv_mem.h"
#include "trv_color.h"
#include "trv_graphicfile.h"
#include "trv_fsutils.h"
#include <stdio.h>
#include <errno.h>
/****************************************************************************
* Pre-processor Definitions
****************************************************************************/
#define COLOR_LEVELS 6
#undef MIN
#undef MAX
#define MIN(a,b) ((a) < (b) ? (a) : (b))
#define MAX(a,b) ((a) > (b) ? (a) : (b))
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: trv_log2
*
* Description:
* Return the log base 2 of the argument, or -1 if the argument is not
* an integer power of 2.
*
***************************************************************************/
static int trv_log2(uint16_t x)
{
int i;
if (x != 0)
{
for (i = 0; i < 16 && (x & 1) == 0; i++, x >>= 1);
}
return (x == 1) ? i : -EINVAL;
}
/****************************************************************************
* Name: trv_new_texture
*
* Description:
***************************************************************************/
static FAR struct trv_bitmap_s *
trv_new_texture(uint16_t width, uint16_t height)
{
struct trv_bitmap_s *bitmap;
int log2h;
int log2w;
/* The height and width should be powers of two for efficient texture
* mapping. Here, we enforce this.
*/
log2w = trv_log2(width);
if (log2w < 0)
{
fprintf(stderr, "ERROR: Width is not a power of 2: %u\n", width);
return NULL;
}
log2h = trv_log2(height);
if (log2h < 0)
{
fprintf(stderr, "ERROR: Height is not a power of 2: %u\n", height);
return NULL;
}
/* Allocate the bitmap container */
bitmap = (FAR struct trv_bitmap_s*)trv_malloc(sizeof(struct trv_bitmap_s));
if (!bitmap)
{
fprintf(stderr, "ERROR: Failed to allocate bitmap structure\n",
height, width);
return NULL;
}
/* Allocate the bitmap texture memory */
bitmap->bm = (trv_pixel_t*)trv_malloc(height * width * sizeof(trv_pixel_t));
if (!bitmap->bm)
{
fprintf(stderr, "ERROR: Failed to allocate bitmap: %u x %u x %u\n",
height, width, sizeof(trv_pixel_t));
trv_free(bitmap);
return NULL;
}
/* Initialize the bitmap container */
bitmap->w = width;
bitmap->h = height;
bitmap->log2h = log2h;
return bitmap;
}
/****************************************************************************
* Name: trv_quantize_texture
* Description:
***************************************************************************/
static void trv_quantize_texture(FAR struct trv_graphicfile_s *gfile,
FAR struct trv_bitmap_s *bitmap)
{
FAR trv_pixel_t *destpixel = bitmap->bm;
struct trv_color_rgb_s pixel;
int x;
int y;
for (x = gfile->width - 1; x >= 0; x--)
{
for (y = gfile->height - 1; y >= 0; y--)
{
pixel = trv_graphicfile_pixel(gfile, x, y);
*destpixel++ = trv_color_rgb2pixel(&pixel);
}
}
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: trv_read_texture
*
* Description:
*
***************************************************************************/
FAR struct trv_bitmap_s *trv_read_texture(char *filename)
{
FAR struct trv_graphicfile_s *gfile;
FAR struct trv_bitmap_s *bitmap;
gfile = tvr_graphicfile_read(filename);
if (gfile == NULL)
{
fprintf(stderr, "Error reading texture %s.", filename);
return NULL;
}
bitmap = trv_new_texture(gfile->width, gfile->height);
if (bitmap)
{
trv_quantize_texture(gfile, bitmap);
}
trv_graphicfile_free(gfile);
return bitmap;
}
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