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nuttx/include/nuttx/nxfonts.h
patacongo 9a7d905289 Allocate smaller buffers for glyphs 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@1422 42af7a65-404d-4744-a932-0658087f49c3
2008-12-06 13:45:05 +00:00

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/****************************************************************************
* include/nuttx/nxfonts.h
*
* Copyright (C) 2008 Gregory Nutt. All rights reserved.
* Author: Gregory Nutt <spudmonkey@racsa.co.cr>
*
* 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.
*
****************************************************************************/
#ifndef __INCLUDE_NUTTX_NXFONTS_H
#define __INCLUDE_NUTTX_NXFONTS_H
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <sys/types.h>
#include <nuttx/nxglib.h>
/****************************************************************************
* Pre-processor definitions
****************************************************************************/
/****************************************************************************
* Public Types
****************************************************************************/
/* This structures provides the metrics for one glyph */
struct nx_fontmetic_s
{
uint32 stride : 2; /* Width of one font row in bytes */
uint32 width : 6; /* Width of the font in bits */
uint32 height : 6; /* Height of the font in rows */
uint32 xoffset : 6; /* Top, left-hand corner X-offset in pixels */
uint32 yoffset : 6; /* Top, left-hand corner y-offset in pixels */
uint32 unused : 6;
};
/* This structure binds the glyph metrics to the glyph bitmap */
struct nx_fontbitmap_s
{
struct nx_fontmetic_s metric; /* Character metrics */
FAR const ubyte *bitmap; /* Pointer to the character bitmap */
};
/* This structure describes one contiguous grouping of glyphs that
* can be described by an array starting with encoding 'first' and
* extending through (first + nchars - 1).
*/
struct nx_fontset_s
{
ubyte first; /* First bitmap character code */
ubyte nchars; /* Number of bitmap character codes */
FAR const struct nx_fontbitmap_s *bitmap;
};
/* This structure describes the overall fontset */
struct nx_font_s
{
ubyte mxheight; /* Max height of one glyph in rows */
ubyte mxwidth; /* Max width of any glyph in pixels */
ubyte mxbits; /* Max number of bits per character code */
ubyte spwidth; /* The width of a space in pixels */
};
/****************************************************************************
* Public Data
****************************************************************************/
#undef EXTERN
#if defined(__cplusplus)
# define EXTERN extern "C"
extern "C" {
#else
# define EXTERN extern
#endif
/****************************************************************************
* Public Function Prototypes
****************************************************************************/
/****************************************************************************
* Name: nxf_getfontset
*
* Description:
* Return information about the current font set
*
* Input Parameters:
* An instance of struct nx_font_s describing the font set.
*
****************************************************************************/
EXTERN FAR const struct nx_font_s *nxf_getfontset(void);
/****************************************************************************
* Name: nxf_getbitmap
*
* Description:
* Return font bitmap information for the selected character encoding.
*
* Input Parameters:
* ch - character code
*
* Returned Value:
* An instance of struct nx_fontbitmap_s describing the glyph.
*
****************************************************************************/
EXTERN FAR const struct nx_fontbitmap_s *nxf_getbitmap(uint16 ch);
/****************************************************************************
* 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)
*
****************************************************************************/
EXTERN int nxf_convert_2bpp(FAR ubyte *dest, uint16 height,
uint16 width, uint16 stride,
FAR const struct nx_fontbitmap_s *bm,
nxgl_mxpixel_t color);
EXTERN int nxf_convert_4bpp(FAR ubyte *dest, uint16 height,
uint16 width, uint16 stride,
FAR const struct nx_fontbitmap_s *bm,
nxgl_mxpixel_t color);
EXTERN int nxf_convert_8bpp(FAR ubyte *dest, uint16 height,
uint16 width, uint16 stride,
FAR const struct nx_fontbitmap_s *bm,
nxgl_mxpixel_t color);
EXTERN int nxf_convert_16bpp(FAR uint16 *dest, uint16 height,
uint16 width, uint16 stride,
FAR const struct nx_fontbitmap_s *bm,
nxgl_mxpixel_t color);
EXTERN int nxf_convert_24bpp(FAR uint32 *dest, uint16 height,
uint16 width, uint16 stride,
FAR const struct nx_fontbitmap_s *bm,
nxgl_mxpixel_t color);
EXTERN int nxf_convert_32bpp(FAR uint32 *dest, uint16 height,
uint16 width, uint16 stride,
FAR const struct nx_fontbitmap_s *bm,
nxgl_mxpixel_t color);
#undef EXTERN
#if defined(__cplusplus)
}
#endif
#endif /* __INCLUDE_NUTTX_NXFONTS_H */
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