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px4-firmware/apps/examples/nxtext/nxtext_bkgd.c

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/****************************************************************************
* examples/nxtext/nxtext_bkgd.c
*
* Copyright (C) 2011-2012 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 <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <semaphore.h>
#include <errno.h>
#include <debug.h>
#include <nuttx/nx/nx.h>
#include <nuttx/nx/nxfonts.h>
#include "nxtext_internal.h"
/****************************************************************************
* Definitions
****************************************************************************/
/****************************************************************************
* Private Types
****************************************************************************/
/****************************************************************************
* Private Function Prototypes
****************************************************************************/
static void nxbg_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
bool morem, FAR void *arg);
static void nxbg_position(NXWINDOW hwnd, FAR const struct nxgl_size_s *size,
FAR const struct nxgl_point_s *pos,
FAR const struct nxgl_rect_s *bounds,
FAR void *arg);
#ifdef CONFIG_NX_MOUSE
static void nxbg_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
uint8_t buttons, FAR void *arg);
#endif
#ifdef CONFIG_NX_KBD
static void nxbg_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
FAR void *arg);
#endif
/****************************************************************************
* Private Data
****************************************************************************/
static struct nxtext_state_s g_bgstate;
static struct nxtext_bitmap_s g_bgbm[CONFIG_EXAMPLES_NXTEXT_BMCACHE];
static struct nxtext_glyph_s g_bgglyph[CONFIG_EXAMPLES_NXTEXT_GLCACHE];
/****************************************************************************
* Public Data
****************************************************************************/
/* Background window call table */
const struct nx_callback_s g_nxtextcb =
{
nxbg_redraw, /* redraw */
nxbg_position /* position */
#ifdef CONFIG_NX_MOUSE
, nxbg_mousein /* mousein */
#endif
#ifdef CONFIG_NX_KBD
, nxbg_kbdin /* my kbdin */
#endif
};
/* Background window handle */
NXHANDLE g_bgwnd;
/****************************************************************************
* Private Functions
****************************************************************************/
/****************************************************************************
* Name: nxbg_redrawrect
****************************************************************************/
static void nxbg_redrawrect(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect)
{
int ret;
int i;
ret = nx_fill(hwnd, rect, g_bgstate.wcolor);
if (ret < 0)
{
message("nxbg_redrawrect: nx_fill failed: %d\n", errno);
}
/* Fill each character on the display (Only the characters within rect
* will actually be redrawn).
*/
for (i = 0; i < g_bgstate.nchars; i++)
{
nxtext_fillchar(hwnd, rect, &g_bgstate, g_bghfont, &g_bgstate.bm[i]);
}
}
/****************************************************************************
* Name: nxbg_redraw
****************************************************************************/
static void nxbg_redraw(NXWINDOW hwnd, FAR const struct nxgl_rect_s *rect,
bool more, FAR void *arg)
{
gvdbg("hwnd=%p rect={(%d,%d),(%d,%d)} more=%s\n",
hwnd, rect->pt1.x, rect->pt1.y, rect->pt2.x, rect->pt2.y,
more ? "true" : "false");
nxbg_redrawrect(hwnd, rect);
}
/****************************************************************************
* Name: nxbg_position
****************************************************************************/
static void nxbg_position(NXWINDOW hwnd, FAR const struct nxgl_size_s *size,
FAR const struct nxgl_point_s *pos,
FAR const struct nxgl_rect_s *bounds,
FAR void *arg)
{
FAR struct nxtext_state_s *st = (FAR struct nxtext_state_s *)arg;
/* Report the position */
gvdbg("hwnd=%p size=(%d,%d) pos=(%d,%d) bounds={(%d,%d),(%d,%d)}\n",
hwnd, size->w, size->h, pos->x, pos->y,
bounds->pt1.x, bounds->pt1.y, bounds->pt2.x, bounds->pt2.y);
/* Have we picked off the window bounds yet? */
if (!b_haveresolution)
{
/* Save the background window handle */
g_bgwnd = hwnd;
/* Save the background window size */
st->wsize.w = size->w;
st->wsize.h = size->h;
/* Save the window limits (these should be the same for all places and all windows */
g_xres = bounds->pt2.x + 1;
g_yres = bounds->pt2.y + 1;
b_haveresolution = true;
sem_post(&g_semevent);
gvdbg("Have xres=%d yres=%d\n", g_xres, g_yres);
}
}
/****************************************************************************
* Name: nxbg_mousein
****************************************************************************/
#ifdef CONFIG_NX_MOUSE
static void nxbg_mousein(NXWINDOW hwnd, FAR const struct nxgl_point_s *pos,
uint8_t buttons, FAR void *arg)
{
message("nxbg_mousein: hwnd=%p pos=(%d,%d) button=%02x\n",
hwnd, pos->x, pos->y, buttons);
}
#endif
/****************************************************************************
* Name: nxbg_kbdin
****************************************************************************/
#ifdef CONFIG_NX_KBD
static void nxbg_kbdin(NXWINDOW hwnd, uint8_t nch, FAR const uint8_t *ch,
FAR void *arg)
{
gvdbg("hwnd=%p nch=%d\n", hwnd, nch);
nxbg_write(hwnd, ch, nch);
}
#endif
/****************************************************************************
* Name: nxbg_movedisplay
*
* Description:
* This function implements the data movement for the scroll operation. If
* we can read the displays framebuffer memory, then the job is pretty
* easy. However, many displays (such as SPI-based LCDs) are often read-
* only.
****************************************************************************/
#ifdef CONFIG_EXAMPLES_NXTEXT_NOGETRUN
static inline void nxbg_movedisplay(NXWINDOW hwnd, int bottom, int lineheight)
{
FAR struct nxtext_bitmap_s *bm;
struct nxgl_rect_s rect;
nxgl_coord_t row;
int ret;
int i;
/* Move each row, one at a time. They could all be moved at once (by calling
* nxbg_redrawrect), but the since the region is cleared, then re-written, the
* effect would not be good. Below the region is also cleared and re-written,
* however, in much smaller chunks.
*/
rect.pt1.x = 0;
rect.pt2.x = g_bgstate.wsize.w - 1;
for (row = LINE_SEPARATION; row < bottom; row += lineheight)
{
/* Create a bounding box the size of one row of characters */
rect.pt1.y = row;
rect.pt2.y = row + lineheight - 1;
/* Clear the region */
ret = nx_fill(hwnd, &rect, g_bgstate.wcolor);
if (ret < 0)
{
message("nxbg_movedisplay: nx_fill failed: %d\n", errno);
}
/* Fill each character that might lie within in the bounding box */
for (i = 0; i < g_bgstate.nchars; i++)
{
bm = &g_bgstate.bm[i];
if (bm->pos.y <= rect.pt2.y && bm->pos.y + g_bgstate.fheight >= rect.pt1.y)
{
nxtext_fillchar(hwnd, &rect, &g_bgstate, g_bghfont, bm);
}
}
}
/* Finally, clear the bottom part of the display */
rect.pt1.y = bottom;
rect.pt2.y = g_bgstate.wsize.h- 1;
ret = nx_fill(hwnd, &rect, g_bgstate.wcolor);
if (ret < 0)
{
message("nxbg_movedisplay: nx_fill failed: %d\n", errno);
}
}
#else
static inline void nxbg_movedisplay(NXWINDOW hwnd, int bottom, int lineheight)
{
struct nxgl_rect_s rect;
struct nxgl_point_s offset;
int ret;
/* Move the display in the range of 0-height up one lineheight. The
* line at the bottom will be reset to the background color automatically.
*
* The source rectangle to be moved.
*/
rect.pt1.x = 0;
rect.pt1.y = lineheight + LINE_SEPARATION;
rect.pt2.x = g_bgstate.wsize.w - 1;
rect.pt2.y = g_bgstate.wsize.h - 1;
/* The offset that determines how far to move the source rectangle */
offset.x = 0;
offset.y = -lineheight;
/* Move the source rectangle */
ret = nx_move(hwnd, &rect, &offset);
if (ret < 0)
{
message("nxbg_movedisplay: nx_move failed: %d\n", errno);
}
}
#endif
/****************************************************************************
* Name: nxbg_scroll
****************************************************************************/
static inline void nxbg_scroll(NXWINDOW hwnd, int lineheight)
{
int i;
int j;
/* Adjust the vertical position of each character */
for (i = 0; i < g_bgstate.nchars; )
{
FAR struct nxtext_bitmap_s *bm = &g_bgstate.bm[i];
/* Has any part of this character scrolled off the screen? */
if (bm->pos.y < lineheight + LINE_SEPARATION)
{
/* Yes... Delete the character by moving all of the data */
for (j = i; j < g_bgstate.nchars-1; j++)
{
memcpy(&g_bgstate.bm[j], &g_bgstate.bm[j+1], sizeof(struct nxtext_bitmap_s));
}
/* Decrement the number of cached characters ('i' is not incremented
* in this case because it already points to the next character)
*/
g_bgstate.nchars--;
}
/* No.. just decrement its vertical position (moving it "up" the
* display by one line).
*/
else
{
bm->pos.y -= lineheight;
/* We are keeping this one so increment to the next character */
i++;
}
}
/* And move the next display position up by one line as well */
g_bgstate.fpos.y -= lineheight;
/* Move the display in the range of 0-height up one lineheight. */
nxbg_movedisplay(hwnd, g_bgstate.fpos.y, lineheight);
}
/****************************************************************************
* Public Functions
****************************************************************************/
/****************************************************************************
* Name: nxbg_getstate
*
* Description:
* Initialize the background window state structure.
*
****************************************************************************/
FAR struct nxtext_state_s *nxbg_getstate(void)
{
FAR const struct nx_font_s *fontset;
/* Initialize the color (used for redrawing the window) */
memset(&g_bgstate, 0, sizeof(struct nxtext_state_s));
g_bgstate.wcolor[0] = CONFIG_EXAMPLES_NXTEXT_BGCOLOR;
g_bgstate.fcolor[0] = CONFIG_EXAMPLES_NXTEXT_BGFONTCOLOR;
/* Get information about the font set being used and save this in the
* state structure
*/
fontset = nxf_getfontset(g_bghfont);
g_bgstate.fheight = fontset->mxheight;
g_bgstate.fwidth = fontset->mxwidth;
g_bgstate.spwidth = fontset->spwidth;
/* Set up the text caches */
g_bgstate.maxchars = CONFIG_EXAMPLES_NXTEXT_BMCACHE;
g_bgstate.maxglyphs = CONFIG_EXAMPLES_NXTEXT_GLCACHE;
g_bgstate.bm = g_bgbm;
g_bgstate.glyph = g_bgglyph;
/* Set the first display position */
nxtext_home(&g_bgstate);
return &g_bgstate;
}
/****************************************************************************
* Name: nxbg_write
*
* Description:
* Put a sequence of bytes in the window.
*
****************************************************************************/
void nxbg_write(NXWINDOW hwnd, FAR const uint8_t *buffer, size_t buflen)
{
int lineheight = (g_bgstate.fheight + LINE_SEPARATION);
while (buflen-- > 0)
{
/* Will another character fit on this line? */
if (g_bgstate.fpos.x + g_bgstate.fwidth > g_bgstate.wsize.w)
{
/* No.. move to the next line */
nxtext_newline(&g_bgstate);
/* If we were about to output a newline character, then don't */
if (*buffer == '\n')
{
buffer++;
continue;
}
}
/* Check if we need to scroll up (handling a corner case where
* there may be more than one newline).
*/
while (g_bgstate.fpos.y >= g_bgstate.wsize.h - lineheight)
{
nxbg_scroll(hwnd, lineheight);
}
/* Finally, we can output the character */
nxtext_putc(hwnd, &g_bgstate, g_bghfont, (uint8_t)*buffer++);
}
}
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