405 lines
12 KiB
C
405 lines
12 KiB
C
/****************************************************************************
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* nuttx/graphics/nxterm/nxterm_font.c
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*
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* Copyright (C) 2012 Gregory Nutt. All rights reserved.
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* Author: Gregory Nutt <gnutt@nuttx.org>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in
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* the documentation and/or other materials provided with the
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* distribution.
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* 3. Neither the name NuttX nor the names of its contributors may be
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* used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
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* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
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* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
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* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
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* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
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* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
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* ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
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* POSSIBILITY OF SUCH DAMAGE.
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*
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****************************************************************************/
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/****************************************************************************
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* Included Files
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****************************************************************************/
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#include <nuttx/config.h>
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#include <string.h>
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#include <assert.h>
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#include <errno.h>
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#include <debug.h>
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#include <nuttx/kmalloc.h>
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#include "nxterm.h"
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/****************************************************************************
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* Private Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxterm_fontsize
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****************************************************************************/
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static int nxterm_fontsize(FAR struct nxterm_state_s *priv, uint8_t ch,
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FAR struct nxgl_size_s *size)
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{
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FAR const struct nx_fontbitmap_s *fbm;
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NXHANDLE hfont;
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/* Get the handle of the font managed by the font cache */
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hfont = nxf_cache_getfonthandle(priv->fcache);
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DEBUGASSERT(hfont != NULL);
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/* Does the character code map to a font? */
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fbm = nxf_getbitmap(hfont, ch);
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if (fbm)
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{
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/* Yes.. return the font size */
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size->w = fbm->metric.width + fbm->metric.xoffset;
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size->h = fbm->metric.height + fbm->metric.yoffset;
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return OK;
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}
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return -ENOENT;
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}
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/****************************************************************************
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* Name: nxterm_fillspace
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****************************************************************************/
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static void nxterm_fillspace(FAR struct nxterm_state_s *priv,
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FAR const struct nxgl_rect_s *rect,
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FAR const struct nxterm_bitmap_s *bm)
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{
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#if 0 /* Not necessary now, but perhaps in the future with VT100 support. */
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struct nxgl_rect_s bounds;
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struct nxgl_rect_s intersection;
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int ret;
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/* Construct a bounding box for the glyph */
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bounds.pt1.x = bm->pos.x;
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bounds.pt1.y = bm->pos.y;
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bounds.pt2.x = bm->pos.x + priv->spwidth - 1;
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bounds.pt2.y = bm->pos.y + priv->fheight - 1;
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# /* Should this also be clipped to a region in the window? */
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if (rect != NULL)
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{
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/* Get the intersection of the redraw region and the character bitmap */
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nxgl_rectintersect(&intersection, rect, &bounds);
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}
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else
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{
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/* The intersection is the whole glyph */
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nxgl_rectcopy(&intersection, &bounds);
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}
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/* Check for empty intersections */
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if (!nxgl_nullrect(&intersection))
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{
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/* Fill the bitmap region with the background color, erasing the
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* character from the display. NOTE: This region might actually
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* be obscured... NX will handle that case.
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*/
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ret = priv->ops->fill(priv, &intersection, priv->wndo.wcolor);
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if (ret < 0)
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{
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gerr("ERROR: fill() method failed: %d\n", ret);
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}
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}
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#endif
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}
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/****************************************************************************
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* Public Functions
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****************************************************************************/
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/****************************************************************************
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* Name: nxterm_addchar
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*
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* Description:
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* This is part of the nxterm_putc logic. It creates and positions a
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* the character and renders (or re-uses) a glyph for font.
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*
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****************************************************************************/
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FAR const struct nxterm_bitmap_s *
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nxterm_addchar(FAR struct nxterm_state_s *priv, uint8_t ch)
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{
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FAR struct nxterm_bitmap_s *bm = NULL;
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FAR const struct nxfonts_glyph_s *glyph;
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/* Is there space for another character on the display? */
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if (priv->nchars < priv->maxchars)
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{
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/* Yes, setup the bitmap information */
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bm = &priv->bm[priv->nchars];
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bm->code = ch;
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bm->flags = 0;
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bm->pos.x = priv->fpos.x;
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bm->pos.y = priv->fpos.y;
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/* Find (or create) the matching glyph */
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glyph = nxf_cache_getglyph(priv->fcache, ch);
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if (!glyph)
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{
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/* No, there is no font for this code. Just mark this as a space. */
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bm->flags |= BMFLAGS_NOGLYPH;
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/* Set up the next character position */
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priv->fpos.x += priv->spwidth;
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}
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else
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{
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/* Set up the next character position */
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priv->fpos.x += glyph->width;
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}
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/* Success.. increment nchars to retain this character */
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priv->nchars++;
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}
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return bm;
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}
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/****************************************************************************
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* Name: nxterm_hidechar
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*
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* Description:
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* Erase a character from the window.
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*
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****************************************************************************/
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int nxterm_hidechar(FAR struct nxterm_state_s *priv,
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FAR const struct nxterm_bitmap_s *bm)
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{
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struct nxgl_rect_s bounds;
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struct nxgl_size_s fsize;
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int ret;
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/* Get the size of the font glyph. If nxterm_fontsize, then the
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* character will have been rendered as a space, and no display
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* modification is required (not an error).
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*/
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ret = nxterm_fontsize(priv, bm->code, &fsize);
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if (ret < 0)
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{
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/* It was rendered as a space. */
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return OK;
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}
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/* Construct a bounding box for the glyph */
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bounds.pt1.x = bm->pos.x;
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bounds.pt1.y = bm->pos.y;
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bounds.pt2.x = bm->pos.x + fsize.w - 1;
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bounds.pt2.y = bm->pos.y + fsize.h - 1;
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/* Fill the bitmap region with the background color, erasing the
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* character from the display. NOTE: This region might actually
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* be obscured... NX will handle that case.
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*/
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return priv->ops->fill(priv, &bounds, priv->wndo.wcolor);
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}
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/****************************************************************************
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* Name: nxterm_backspace
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*
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* Description:
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* Remove the last character from the window.
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*
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****************************************************************************/
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int nxterm_backspace(FAR struct nxterm_state_s *priv)
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{
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FAR struct nxterm_bitmap_s *bm;
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int ndx;
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int ret = -ENOENT;
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/* Is there a character on the display? */
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if (priv->nchars > 0)
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{
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/* Yes.. Get the index to the last bitmap on the display */
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ndx = priv->nchars - 1;
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bm = &priv->bm[ndx];
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/* Erase the character from the display */
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ret = nxterm_hidechar(priv, bm);
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/* The current position to the location where the last character was */
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priv->fpos.x = bm->pos.x;
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priv->fpos.y = bm->pos.y;
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/* Decrement nchars to discard this character */
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priv->nchars = ndx;
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}
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return ret;
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}
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/****************************************************************************
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* Name: nxterm_home
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*
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* Description:
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* Set the next character position to the top-left corner of the display.
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*
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****************************************************************************/
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void nxterm_home(FAR struct nxterm_state_s *priv)
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{
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/* The first character is one space from the left */
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priv->fpos.x = priv->spwidth;
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/* And CONFIG_NXTERM_LINESEPARATION lines from the top */
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priv->fpos.y = CONFIG_NXTERM_LINESEPARATION;
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}
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/****************************************************************************
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* Name: nxterm_newline
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*
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* Description:
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* Set the next character position to the beginning of the next line.
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*
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****************************************************************************/
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void nxterm_newline(FAR struct nxterm_state_s *priv)
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{
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/* Carriage return: The first character is one space from the left */
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priv->fpos.x = priv->spwidth;
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/* Linefeed: Down the max font height + CONFIG_NXTERM_LINESEPARATION */
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priv->fpos.y += (priv->fheight + CONFIG_NXTERM_LINESEPARATION);
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}
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/****************************************************************************
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* Name: nxterm_fillchar
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*
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* Description:
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* This implements the character display. It is part of the nxterm_putc
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* operation but may also be used when redrawing an existing display.
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*
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****************************************************************************/
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void nxterm_fillchar(FAR struct nxterm_state_s *priv,
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FAR const struct nxgl_rect_s *rect,
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FAR const struct nxterm_bitmap_s *bm)
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{
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FAR const struct nxfonts_glyph_s *glyph;
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struct nxgl_rect_s bounds;
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struct nxgl_rect_s intersection;
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struct nxgl_size_s fsize;
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int ret;
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/* Handle the special case of spaces which have no glyph bitmap */
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if (BM_ISSPACE(bm))
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{
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nxterm_fillspace(priv, rect, bm);
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return;
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}
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/* Get the size of the font glyph (which may not have been created yet) */
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ret = nxterm_fontsize(priv, bm->code, &fsize);
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if (ret < 0)
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{
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/* This would mean that there is no bitmap for the character code and
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* that the font would be rendered as a space. But this case should
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* never happen here because the BM_ISSPACE() should have already
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* found all such cases.
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*/
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return;
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}
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/* Construct a bounding box for the glyph */
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bounds.pt1.x = bm->pos.x;
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bounds.pt1.y = bm->pos.y;
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bounds.pt2.x = bm->pos.x + fsize.w - 1;
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bounds.pt2.y = bm->pos.y + fsize.h - 1;
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/* Should this also be clipped to a region in the window? */
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if (rect != NULL)
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{
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/* Get the intersection of the redraw region and the character bitmap */
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nxgl_rectintersect(&intersection, rect, &bounds);
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}
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else
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{
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/* The intersection is the whole glyph */
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nxgl_rectcopy(&intersection, &bounds);
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}
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/* Check for empty intersections */
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if (!nxgl_nullrect(&intersection))
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{
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FAR const void *src;
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/* Find (or create) the glyph that goes with this font */
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glyph = nxf_cache_getglyph(priv->fcache, bm->code);
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if (!glyph)
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{
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/* Shouldn't happen */
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return;
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}
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/* Blit the font bitmap into the window */
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src = (FAR const void *)glyph->bitmap;
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ret = priv->ops->bitmap(priv, &intersection, &src,
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&bm->pos, (unsigned int)glyph->stride);
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DEBUGASSERT(ret >= 0);
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}
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}
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