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/*
* BRLTTY - A background process providing access to the console screen (when in
* text mode) for a blind person using a refreshable braille display.
*
* Copyright (C) 1995-2010 by The BRLTTY Developers.
*
* BRLTTY comes with ABSOLUTELY NO WARRANTY.
*
* This is free software, placed under the terms of the
* GNU General Public License, as published by the Free Software
* Foundation; either version 2 of the License, or (at your option) any
* later version. Please see the file LICENSE-GPL for details.
*
* Web Page: http://mielke.cc/brltty/
*
* This software is maintained by Dave Mielke <dave@mielke.cc>.
*/
#include "prologue.h"
#include <stdio.h>
#include "log.h"
#include "touch.h"
#include "brltty.h"
static int touchLeft;
static int touchRight;
static int touchTop;
static int touchBottom;
int
touchGetRegion (int *left, int *right, int *top, int *bottom) {
if ((touchLeft > touchRight) || (touchTop > touchBottom)) return 0;
*left = touchLeft;
*right = touchRight;
*top = touchTop;
*bottom = touchBottom;
return 1;
}
static inline int
touchCheckColumn (BrailleDisplay *brl, const unsigned char *pressure, int column) {
int row;
for (row=touchTop; row<=touchBottom; ++row) {
if (pressure[(row * brl->textColumns) + column]) return 1;
}
return 0;
}
static inline int
touchCheckRow (BrailleDisplay *brl, const unsigned char *pressure, int row) {
int column;
for (column=touchLeft; column<=touchRight; ++column) {
if (pressure[(row * brl->textColumns) + column]) return 1;
}
return 0;
}
static inline int
touchCropLeft (BrailleDisplay *brl, const unsigned char *pressure) {
while (touchLeft <= touchRight) {
if (touchCheckColumn(brl, pressure, touchLeft)) return 1;
++touchLeft;
}
return 0;
}
static inline int
touchCropRight (BrailleDisplay *brl, const unsigned char *pressure) {
while (touchRight >= touchLeft) {
if (touchCheckColumn(brl, pressure, touchRight)) return 1;
--touchRight;
}
return 0;
}
static inline int
touchCropTop (BrailleDisplay *brl, const unsigned char *pressure) {
while (touchTop <= touchBottom) {
if (touchCheckRow(brl, pressure, touchTop)) return 1;
++touchTop;
}
return 0;
}
static inline int
touchCropBottom (BrailleDisplay *brl, const unsigned char *pressure) {
while (touchBottom >= touchTop) {
if (touchCheckRow(brl, pressure, touchBottom)) return 1;
--touchBottom;
}
return 0;
}
static inline int
touchCropWindow (BrailleDisplay *brl, const unsigned char *pressure) {
if (pressure) {
if (touchCropRight(brl, pressure)) {
touchCropLeft(brl, pressure);
touchCropTop(brl, pressure);
touchCropBottom(brl, pressure);
return 1;
}
}
touchBottom = touchTop - 1;
return 0;
}
static inline void
touchUncropWindow (BrailleDisplay *brl) {
touchLeft = textStart;
touchRight = textStart + textCount - 1;
touchTop = 0;
touchBottom = brl->textRows - 1;
}
static inline int
touchRecropWindow (BrailleDisplay *brl, const unsigned char *pressure) {
touchUncropWindow(brl);
return touchCropWindow(brl, pressure);
}
int
touchAnalyzePressure (BrailleDisplay *brl, const unsigned char *pressure) {
if (pressure) {
LogBytes(LOG_DEBUG, "Touch Pressure", pressure, brl->textColumns*brl->textRows);
} else {
LogPrint(LOG_DEBUG, "Touch Pressure off");
}
touchRecropWindow(brl, pressure);
brl->highlightWindow = 1;
return EOF;
}
void
touchAnalyzeCells (BrailleDisplay *brl, const unsigned char *cells) {
}
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