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nuttx/libnx/nxfonts/nxfonts_convert.c

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/****************************************************************************
* libnx/nxfonts/nxfonts_convert.c
*
* Copyright (C) 2008-2010 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 <nuttx/config.h>
#include <stdint.h>
#include <stddef.h>
#include <debug.h>
#include <nuttx/nx/nxglib.h>
#include <nuttx/nx/nxfonts.h>
#include "nxfonts.h"
/****************************************************************************
* Pre-Processor Definitions
****************************************************************************/
/* Make sure the bits-per-pixel value has been set */
#ifndef NXFONTS_BITSPERPIXEL
# error "NXFONTS_BITSPERPIXEL must be defined on the command line"
#endif
/* Set up bit blit macros for this BPP */
#if NXFONTS_BITSPERPIXEL == 1
# define NXF_PIXELMASK 0x01
# define NXF_SCALEX(x) ((x) >> 3)
# define NXF_PIXEL_T uint8_t
# define NXF_MULTIPIXEL(p) ((p) ? 0xff : 0x00)
#elif NXFONTS_BITSPERPIXEL == 2
# define NXF_PIXELMASK 0x03
# define NXF_SCALEX(x) ((x) >> 2)
# define NXF_PIXEL_T uint8_t
# define NXF_MULTIPIXEL(p) ((uint8_t)(p) << 6 | (uint8_t)(p) << 4 | (uint8_t)(p) << 2 | (p))
#elif NXFONTS_BITSPERPIXEL == 4
# define NXF_PIXELMASK 0x0f
# define NXF_SCALEX(x) ((x) >> 1)
# define NXF_PIXEL_T uint8_t
# define NXF_MULTIPIXEL(p) ((uint8_t)(p) << 4 | (p))
#elif NXFONTS_BITSPERPIXEL == 8
# define NXF_SCALEX(x) (x)
# define NXF_PIXEL_T uint8_t
#elif NXFONTS_BITSPERPIXEL == 16
# define NXF_SCALEX(x) ((x) << 1)
# define NXF_PIXEL_T uint16_t
#elif NXFONTS_BITSPERPIXEL == 24
# define NXF_SCALEX(x) (((x) << 1) + (x))
# define NXF_PIXEL_T uint32_t
#elif NXFONTS_BITSPERPIXEL == 32
# define NXF_SCALEX(x) ((x) << 2)
# define NXF_PIXEL_T uint32_t
#endif
#if NXFONTS_BITSPERPIXEL < 8
# ifdef CONFIG_NX_PACKEDMSFIRST
# define NXF_INITMASK (NXF_PIXELMASK << (8 - NXFONTS_BITSPERPIXEL))
# else
# define NXF_INITMASK NXF_PIXELMASK
# endif
#endif
/* Form a function name by concatenating two strings */
#define _NXF_FUNCNAME(a,b) a ## b
#define NXF_FUNCNAME(a,b) _NXF_FUNCNAME(a,b)
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxf_convert_*bpp
*
* Description:
* Convert the 1BPP font to a new pixel depth
*
* Input Parameters:
* dest - The destination buffer provided by the caller.
* height - The max height of the returned char in rows
* width - The max width of the returned char in pixels
* stride - The width of the destination buffer in bytes
* bm - Describes the character glyph to convert
* color - The color to use for '1' bits in the font bitmap
* (0 bits are transparent)
*
* Returned Value:
* OK on Success, ERROR: on failure with errno set appropriately.
* (never fails)
*
****************************************************************************/
int NXF_FUNCNAME(nxf_convert,NXFONTS_SUFFIX)
(FAR NXF_PIXEL_T *dest, uint16_t height, uint16_t width, uint16_t stride,
FAR const struct nx_fontbitmap_s *bm, nxgl_mxpixel_t color)
{
FAR uint8_t *line;
FAR NXF_PIXEL_T *dptr;
FAR const uint8_t *sptr;
uint8_t bmbyte;
int bmbit;
int row;
int col;
int bmndx;
#if NXFONTS_BITSPERPIXEL < 8
NXF_PIXEL_T mpixel;
NXF_PIXEL_T mask;
NXF_PIXEL_T pixel;
int nbits;
#endif
/* Get the starting position */
line = (uint8_t*)dest + bm->metric.yoffset * stride + NXF_SCALEX(bm->metric.xoffset);
/* Then copy the font */
height = ngl_min(bm->metric.height, height - bm->metric.yoffset);
width = ngl_min(bm->metric.width, width - bm->metric.xoffset);
/* Render each row of the glyph */
sptr = bm->bitmap;
#if NXFONTS_BITSPERPIXEL < 8
mpixel = NXF_MULTIPIXEL(color);
/* Handle each row in both the input and output */
for (row = 0; row < height; row++)
{
/* Process each byte in the glyph row */
col = 0;
dptr = (FAR NXF_PIXEL_T*)line;
pixel = *dptr;
mask = NXF_INITMASK;
nbits = 0;
for (bmndx = 0; bmndx < bm->metric.stride && col < width; bmndx++)
{
bmbyte = *sptr++;
/* Process each bit in one byte */
for (bmbit = 7; bmbit >= 0 && col < width; bmbit--, col++)
{
/* Is the bit set? */
if (bmbyte & (1 << bmbit))
{
/* Yes.. set the bit to 'color' in the output */
pixel = ((pixel & ~mask) | (mpixel & mask));
}
#ifdef CONFIG_NX_PACKEDMSFIRST
mask >>= NXFONTS_BITSPERPIXEL;
#else
mask <<= NXFONTS_BITSPERPIXEL;
#endif
nbits += NXFONTS_BITSPERPIXEL;
if (nbits >= 8)
{
*dptr++ = pixel;
pixel = *dptr;
mask = NXF_INITMASK;
nbits = 0;
}
}
}
/* The entire glyph row has been rendered. Handle any fractional bytes at
* the end of the row
*/
if (nbits > 0)
{
*dptr = pixel;
}
/* Point to the beginning of the next row */
line += stride;
}
#else
/* Handle each row in both the input and output */
for (row = 0; row < height; row++)
{
/* Process each byte in the glyph */
col = 0;
dptr = (FAR NXF_PIXEL_T*)line;
for (bmndx = 0; bmndx < bm->metric.stride && col < width; bmndx++)
{
bmbyte = *sptr++;
/* Process each bit in the byte */
for (bmbit = 7; bmbit >= 0 && col < width; bmbit--, col++)
{
/* Is the bit set? */
if (bmbyte & (1 << bmbit))
{
/* Yes.. set the bit to 'color' in the output */
*dptr++ = color;
}
else
{
/* No... keep the background color in the output */
dptr++;
}
}
}
/* Advance to the beginning of the next line in the destination */
line += stride;
}
#endif
return OK;
}
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