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- /****************************************************************************
- * graphics/nxterm/nxterm_scroll.c
- *
- * Licensed to the Apache Software Foundation (ASF) under one or more
- * contributor license agreements. See the NOTICE file distributed with
- * this work for additional information regarding copyright ownership. The
- * ASF licenses this file to you under the Apache License, Version 2.0 (the
- * "License"); you may not use this file except in compliance with the
- * License. You may obtain a copy of the License at
- *
- * http://www.apache.org/licenses/LICENSE-2.0
- *
- * Unless required by applicable law or agreed to in writing, software
- * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
- * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
- * License for the specific language governing permissions and limitations
- * under the License.
- *
- ****************************************************************************/
- /****************************************************************************
- * Included Files
- ****************************************************************************/
- #include <nuttx/config.h>
- #include <stdint.h>
- #include <stdbool.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <errno.h>
- #include <debug.h>
- #include <nuttx/nx/nx.h>
- #include <nuttx/nx/nxfonts.h>
- #include "nxterm.h"
- /****************************************************************************
- * Private Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxterm_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_NX_WRITEONLY
- static inline void nxterm_movedisplay(FAR struct nxterm_state_s *priv,
- int bottom, int scrollheight)
- {
- FAR struct nxterm_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 nxterm_redraw), 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 = priv->wndo.wsize.w - 1;
- for (row = CONFIG_NXTERM_LINESEPARATION; row < bottom; row += scrollheight)
- {
- /* Create a bounding box the size of one row of characters */
- rect.pt1.y = row;
- rect.pt2.y = row + scrollheight - 1;
- /* Clear the region */
- ret = priv->ops->fill(priv, &rect, priv->wndo.wcolor);
- if (ret < 0)
- {
- gerr("ERROR: Fill failed: %d\n", get_errno());
- }
- /* Fill each character that might lie within in the bounding box */
- for (i = 0; i < priv->nchars; i++)
- {
- bm = &priv->bm[i];
- if (bm->pos.y <= rect.pt2.y &&
- bm->pos.y + priv->fheight >= rect.pt1.y)
- {
- nxterm_fillchar(priv, &rect, bm);
- }
- }
- }
- /* Finally, clear the vacated part of the display */
- rect.pt1.y = bottom;
- rect.pt2.y = priv->wndo.wsize.h - 1;
- ret = priv->ops->fill(priv, &rect, priv->wndo.wcolor);
- if (ret < 0)
- {
- gerr("ERROR: Fill failed: %d\n", get_errno());
- }
- }
- #else
- static inline void nxterm_movedisplay(FAR struct nxterm_state_s *priv,
- int bottom, int scrollheight)
- {
- struct nxgl_rect_s rect;
- struct nxgl_point_s offset;
- int ret;
- /* Add the line separation value to the scroll height */
- scrollheight += CONFIG_NXTERM_LINESEPARATION;
- /* Move the display in the range of 0-height up one scrollheight. 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 = scrollheight;
- rect.pt2.x = priv->wndo.wsize.w - 1;
- rect.pt2.y = priv->wndo.wsize.h - 1;
- /* The offset that determines how far to move the source rectangle */
- offset.x = 0;
- offset.y = -scrollheight;
- /* Move the source rectangle upward by the scrollheight */
- ret = priv->ops->move(priv, &rect, &offset);
- if (ret < 0)
- {
- gerr("ERROR: Move failed: %d\n", get_errno());
- }
- /* Finally, clear the vacated bottom part of the display */
- rect.pt1.y = priv->wndo.wsize.h - scrollheight;
- ret = priv->ops->fill(priv, &rect, priv->wndo.wcolor);
- if (ret < 0)
- {
- gerr("ERROR: Fill failed: %d\n", get_errno());
- }
- }
- #endif
- /****************************************************************************
- * Public Functions
- ****************************************************************************/
- /****************************************************************************
- * Name: nxterm_scroll
- ****************************************************************************/
- void nxterm_scroll(FAR struct nxterm_state_s *priv, int scrollheight)
- {
- int i;
- int j;
- /* Adjust the vertical position of each character */
- for (i = 0; i < priv->nchars; )
- {
- FAR struct nxterm_bitmap_s *bm = &priv->bm[i];
- /* Has any part of this character scrolled off the screen? */
- if (bm->pos.y < scrollheight + CONFIG_NXTERM_LINESEPARATION)
- {
- /* Yes... Delete the character by moving all of the data */
- for (j = i; j < priv->nchars - 1; j++)
- {
- memcpy(&priv->bm[j], &priv->bm[j + 1],
- sizeof(struct nxterm_bitmap_s));
- }
- /* Decrement the number of cached characters ('i' is not
- * incremented in this case because it already points to the next
- * character)
- */
- priv->nchars--;
- }
- /* No.. just decrement its vertical position (moving it "up" the
- * display by one line).
- */
- else
- {
- bm->pos.y -= scrollheight;
- /* We are keeping this one so increment to the next character */
- i++;
- }
- }
- /* And move the next display position up by one line as well */
- priv->fpos.y -= scrollheight;
- /* Move the display in the range of 0-height up one scrollheight. */
- nxterm_movedisplay(priv, priv->fpos.y, scrollheight);
- }
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