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nuttx-apps/examples/nxtext/nxtext_putc.c
patacongo 9696a6d1aa Fix a critical font rendering bug 
git-svn-id: svn://svn.code.sf.net/p/nuttx/code/trunk@3762 42af7a65-404d-4744-a932-0658087f49c3
2011-07-09 20:41:08 +00:00

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/****************************************************************************
* examples/nxtext/nxtext_putc.c
*
* Copyright (C) 2011 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.
*
****************************************************************************/
/****************************************************************************
* Included Files
****************************************************************************/
#include <nuttx/config.h>
#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <ctype.h>
#include <debug.h>
#include <errno.h>
#include <nuttx/nx.h>
#include <nuttx/nxtk.h>
#include <nuttx/nxfonts.h>
#include "nxtext_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/* Select renderer -- Some additional logic would be required to support
* pixel depths that are not directly addressable (1,2,4, and 24).
*/
#if CONFIG_EXAMPLES_NXTEXT_BPP == 1
# define RENDERER nxf_convert_1bpp
#elif CONFIG_EXAMPLES_NXTEXT_BPP == 2
# define RENDERER nxf_convert_2bpp
#elif CONFIG_EXAMPLES_NXTEXT_BPP == 4
# define RENDERER nxf_convert_4bpp
#elif CONFIG_EXAMPLES_NXTEXT_BPP == 8
# define RENDERER nxf_convert_8bpp
#elif CONFIG_EXAMPLES_NXTEXT_BPP == 16
# define RENDERER nxf_convert_16bpp
#elif CONFIG_EXAMPLES_NXTEXT_BPP == 24
# define RENDERER nxf_convert_24bpp
#elif CONFIG_EXAMPLES_NXTEXT_BPP == 32
# define RENDERER nxf_convert_32bpp
#else
# error "Unsupported CONFIG_EXAMPLES_NXTEXT_BPP"
#endif
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
/****************************************************************************
* Private Data
****************************************************************************/
/****************************************************************************
* Public Data
****************************************************************************/
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxtext_freeglyph
****************************************************************************/
static void nxtext_freeglyph(FAR struct nxtext_glyph_s *glyph)
{
if (glyph->bitmap)
{
free(glyph->bitmap);
}
memset(glyph, 0, sizeof(struct nxtext_glyph_s));
}
/****************************************************************************
* Name: nxtext_allocglyph
****************************************************************************/
static inline FAR struct nxtext_glyph_s *
nxtext_allocglyph(FAR struct nxtext_state_s *st)
{
FAR struct nxtext_glyph_s *glyph = NULL;
FAR struct nxtext_glyph_s *luglyph = NULL;
uint8_t luusecnt;
int i;
/* Search through the glyph cache looking for an unused glyph. Also, keep
* track of the least used glyph as well. We need that if we have to replace
* a glyph in the cache.
*/
for (i = 0; i < st->maxglyphs; i++)
{
/* Is this glyph in use? */
glyph = &st->glyph[i];
if (!glyph->usecnt)
{
/* No.. return this glyph with a use count of one */
glyph->usecnt = 1;
return glyph;
}
/* Yes.. check for the least recently used */
if (!luglyph || glyph->usecnt < luglyph->usecnt)
{
luglyph = glyph;
}
}
/* If we get here, the glyph cache is full. We replace the least used
* glyph with the one we need now. (luglyph can't be NULL).
*/
luusecnt = luglyph->usecnt;
nxtext_freeglyph(luglyph);
/* But lets decrement all of the usecnts so that the new one one be so
* far behind in the counts as the older ones.
*/
if (luusecnt > 1)
{
uint8_t decr = luusecnt - 1;
for (i = 0; i < st->maxglyphs; i++)
{
/* Is this glyph in use? */
glyph = &st->glyph[i];
if (glyph->usecnt > decr)
{
glyph->usecnt -= decr;
}
}
}
/* Then return the least used glyph */
luglyph->usecnt = 1;
return luglyph;
}
/****************************************************************************
* Name: nxtext_findglyph
****************************************************************************/
static FAR struct nxtext_glyph_s *
nxtext_findglyph(FAR struct nxtext_state_s *st, uint8_t ch)
{
int i;
/* First, try to find the glyph in the cache of pre-rendered glyphs */
for (i = 0; i < st->maxglyphs; i++)
{
FAR struct nxtext_glyph_s *glyph = &st->glyph[i];
if (glyph->usecnt > 0 && glyph->code == ch)
{
/* Increment the use count (unless it is already at the max) */
if (glyph->usecnt < MAX_USECNT)
{
glyph->usecnt++;
}
/* And return the glyph that we found */
return glyph;
}
}
return NULL;
}
/****************************************************************************
* Name: nxtext_renderglyph
****************************************************************************/
static inline FAR struct nxtext_glyph_s *
nxtext_renderglyph(FAR struct nxtext_state_s *st,
FAR const struct nx_fontbitmap_s *bm, uint8_t ch)
{
FAR struct nxtext_glyph_s *glyph = NULL;
FAR nxgl_mxpixel_t *ptr;
#if CONFIG_EXAMPLES_NXTEXT_BPP < 8
nxgl_mxpixel_t pixel;
#endif
int bmsize;
int row;
int col;
int ret;
/* Make sure that there is room for another glyph */
message("nxtext_renderglyph: ch=%02x\n", ch);
/* Allocate the glyph (always succeeds) */
glyph = nxtext_allocglyph(st);
glyph->code = ch;
/* Get the dimensions of the glyph */
glyph->width = bm->metric.width + bm->metric.xoffset;
glyph->height = bm->metric.height + bm->metric.yoffset;
/* Allocate memory to hold the glyph with its offsets */
glyph->stride = (glyph->width * CONFIG_EXAMPLES_NXTEXT_BPP + 7) / 8;
bmsize = glyph->stride * glyph->height;
glyph->bitmap = (FAR uint8_t *)malloc(bmsize);
if (glyph->bitmap)
{
/* Initialize the glyph memory to the background color */
#if CONFIG_EXAMPLES_NXTEXT_BPP < 8
pixel = st->wcolor[0];
# if CONFIG_EXAMPLES_NXTEXT_BPP == 1
/* Pack 1-bit pixels into a 2-bits */
pixel &= 0x01;
pixel = (pixel) << 1 |pixel;
# endif
# if CONFIG_EXAMPLES_NXTEXT_BPP < 4
/* Pack 2-bit pixels into a nibble */
pixel &= 0x03;
pixel = (pixel) << 2 |pixel;
# endif
/* Pack 4-bit nibbles into a byte */
pixel &= 0x0f;
pixel = (pixel) << 4 | pixel;
ptr = (FAR nxgl_mxpixel_t *)glyph->bitmap;
for (row = 0; row < glyph->height; row++)
{
for (col = 0; col < glyph->stride; col++)
{
/* Transfer the packed bytes into the buffer */
*ptr++ = pixel;
}
}
#elif CONFIG_EXAMPLES_NXTEXT_BPP == 24
# error "Additional logic is needed here for 24bpp support"
#else /* CONFIG_EXAMPLES_NXTEXT_BPP = {8,16,32} */
ptr = (FAR nxgl_mxpixel_t *)glyph->bitmap;
for (row = 0; row < glyph->height; row++)
{
/* Just copy the color value into the glyph memory */
for (col = 0; col < glyph->width; col++)
{
*ptr++ = st->wcolor[0];
}
}
#endif
/* Then render the glyph into the allocated memory */
ret = RENDERER((FAR nxgl_mxpixel_t*)glyph->bitmap,
glyph->height, glyph->width, glyph->stride,
bm, st->fcolor[0]);
if (ret < 0)
{
/* Actually, the RENDERER never returns a failure */
message("nxtext_renderglyph: RENDERER failed\n");
nxtext_freeglyph(glyph);
glyph = NULL;
}
}
return glyph;
}
/****************************************************************************
* Name: nxtext_getglyph
****************************************************************************/
static FAR struct nxtext_glyph_s *
nxtext_getglyph(FAR struct nxtext_state_s *st, uint8_t ch)
{
FAR struct nxtext_glyph_s *glyph;
FAR const struct nx_fontbitmap_s *fbm;
/* First, try to find the glyph in the cache of pre-rendered glyphs */
glyph = nxtext_findglyph(st, ch);
if (!glyph)
{
/* No, it is not cached... Does the code map to a font? */
fbm = nxf_getbitmap(ch);
if (fbm)
{
/* Yes.. render the glyph */
glyph = nxtext_renderglyph(st, fbm, ch);
}
}
return glyph;
}
/****************************************************************************
* Name: nxtext_addchar
*
* Description:
* This is part of the nxtext_putc logic. It creates and positions a
* the character and renders (or re-uses) a glyph for font.
*
****************************************************************************/
static FAR const struct nxtext_bitmap_s *
nxtext_addchar(FAR struct nxtext_state_s *st, uint8_t ch)
{
FAR struct nxtext_bitmap_s *bm = NULL;
FAR struct nxtext_glyph_s *glyph;
/* Is there space for another character on the display? */
if (st->nchars < st->maxchars)
{
/* Yes, setup the bitmap information */
bm = &st->bm[st->nchars];
bm->code = ch;
bm->flags = 0;
bm->pos.x = st->fpos.x;
bm->pos.y = st->fpos.y;
/* Find (or create) the matching glyph */
glyph = nxtext_getglyph(st, ch);
if (!glyph)
{
/* No, there is no font for this code. Just mark this as a space. */
bm->flags |= BMFLAGS_NOGLYPH;
/* Set up the next character position */
st->fpos.x += st->spwidth;
}
else
{
/* Set up the next character position */
st->fpos.x += glyph->width;
}
/* Success.. increment nchars to retain this character */
st->nchars++;
}
return bm;
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxtext_home
*
* Description:
* Set the next character position to the top-left corner of the display.
*
****************************************************************************/
void nxtext_home(FAR struct nxtext_state_s *st)
{
/* The first character is one space from the left */
st->fpos.x = st->spwidth;
/* And two lines from the top */
st->fpos.y = 2;
}
/****************************************************************************
* Name: nxtext_newline
*
* Description:
* Set the next character position to the beginning of the next line.
*
****************************************************************************/
void nxtext_newline(FAR struct nxtext_state_s *st)
{
/* Carriage return: The first character is one space from the left */
st->fpos.x = st->spwidth;
/* Linefeed: Done the max font height + 2 */
st->fpos.y += (st->fheight + 2);
}
/****************************************************************************
* Name: nxtext_putc
*
* Description:
* Render the specified character at the current display position.
*
****************************************************************************/
void nxtext_putc(NXWINDOW hwnd, FAR struct nxtext_state_s *st, uint8_t ch)
{
FAR const struct nxtext_bitmap_s *bm;
/* If it is a newline character, then just perform the logical newline
* operation.
*/
if (ch == '\n')
{
nxtext_newline(st);
}
/* Otherwise, find the glyph associated with the character and render it
* onto the display.
*/
else
{
bm = nxtext_addchar(st, ch);
if (bm)
{
nxtext_fillchar(hwnd, NULL, st, bm);
}
}
}
/****************************************************************************
* Name: nxtext_fillchar
*
* Description:
* This implements the character display. It is part of the nxtext_putc
* operation but may also be used when redrawing an existing display.
*
****************************************************************************/
void nxtext_fillchar(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
FAR struct nxtext_state_s *st,
FAR const struct nxtext_bitmap_s *bm)
{
FAR struct nxtext_glyph_s *glyph;
struct nxgl_rect_s bounds;
struct nxgl_rect_s intersection;
int ret;
/* Handle the special case of spaces which have no glyph bitmap */
if (BM_ISSPACE(bm))
{
return;
}
/* Find (or create) the matching glyph */
glyph = nxtext_getglyph(st, bm->code);
if (!glyph)
{
/* This shouldn't happen */
return;
}
/* Construct a bounding box for the glyph */
bounds.pt1.x = bm->pos.x;
bounds.pt1.y = bm->pos.y;
bounds.pt1.x = bm->pos.x + glyph->width - 1;
bounds.pt1.y = bm->pos.y + glyph->height - 1;
/* Should this also be clipped to a region in the window? */
if (rect)
{
/* Get the intersection of the redraw region and the character bitmap */
nxgl_rectintersect(&intersection, rect, &bounds);
}
else
{
/* The intersection is the whole glyph */
nxgl_rectcopy(&intersection, &bounds);
}
/* Check for empty intersections */
if (!nxgl_nullrect(&intersection))
{
FAR const void *src = (FAR const void *)glyph->bitmap;
ret = nx_bitmap((NXWINDOW)hwnd, &intersection, &src,
&bm->pos, (unsigned int)glyph->stride);
if (ret < 0)
{
message("nxtext_fillchar: nx_bitmapwindow failed: %d\n", errno);
}
}
}
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