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rockbox/apps/plugins/lib/grey_scroll.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* New greyscale framework
* Scrolling routines
*
* This is a generic framework to display 129 shades of grey on low-depth
* bitmap LCDs (Archos b&w, Iriver & Ipod 4-grey) within plugins.
*
* Copyright (C) 2008 Jens Arnold
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "plugin.h"
#include "grey.h"
/*** Scrolling ***/
/* Scroll left */
void grey_scroll_left(int count)
{
unsigned char *data, *data_end;
int length, blank;
if ((unsigned)count >= (unsigned)_grey_info.width)
return;
data = _grey_info.buffer;
data_end = data + _GREY_MULUQ(_grey_info.width, _grey_info.height);
length = _grey_info.width - count;
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
do
{
_grey_rb->memmove(data, data + count, length);
_grey_rb->memset(data + length, blank, count);
data += _grey_info.width;
}
while (data < data_end);
}
/* Scroll right */
void grey_scroll_right(int count)
{
unsigned char *data, *data_end;
int length, blank;
if ((unsigned)count >= (unsigned)_grey_info.width)
return;
data = _grey_info.buffer;
data_end = data + _GREY_MULUQ(_grey_info.width, _grey_info.height);
length = _grey_info.width - count;
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
do
{
_grey_rb->memmove(data + count, data, length);
_grey_rb->memset(data, blank, count);
data += _grey_info.width;
}
while (data < data_end);
}
/* Scroll up */
void grey_scroll_up(int count)
{
long shift, length;
int blank;
if ((unsigned)count >= (unsigned)_grey_info.height)
return;
shift = _GREY_MULUQ(_grey_info.width, count);
length = _GREY_MULUQ(_grey_info.width, _grey_info.height - count);
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
_grey_rb->memmove(_grey_info.buffer, _grey_info.buffer + shift, length);
_grey_rb->memset(_grey_info.buffer + length, blank, shift);
}
/* Scroll down */
void grey_scroll_down(int count)
{
long shift, length;
int blank;
if ((unsigned)count >= (unsigned)_grey_info.height)
return;
shift = _GREY_MULUQ(_grey_info.width, count);
length = _GREY_MULUQ(_grey_info.width, _grey_info.height - count);
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
_grey_rb->memmove(_grey_info.buffer + shift, _grey_info.buffer, length);
_grey_rb->memset(_grey_info.buffer, blank, shift);
}
/*** Unbuffered scrolling functions ***/
#ifdef SIMULATOR
/* Scroll left */
void grey_ub_scroll_left(int count)
{
grey_scroll_left(count);
grey_update();
}
/* Scroll right */
void grey_ub_scroll_right(int count)
{
grey_scroll_right(count);
grey_update();
}
/* Scroll up */
void grey_ub_scroll_up(int count)
{
grey_scroll_up(count);
grey_update();
}
/* Scroll down */
void grey_ub_scroll_down(int count)
{
grey_scroll_down(count);
grey_update();
}
#else /* !SIMULATOR */
/* Scroll left */
void grey_ub_scroll_left(int count)
{
unsigned char *dst, *src, *end;
int blank, y, idx;
if ((count == 0) || ((unsigned)count >= (unsigned)_grey_info.width))
return;
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
for (y = 0; y < _grey_info.height; y++)
{
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
idx = _GREY_MULUQ(_grey_info.width, y);
#else
#if LCD_DEPTH == 1
idx = _GREY_MULUQ(_grey_info.width, y & ~7) + (~y & 7);
#elif LCD_DEPTH == 2
idx = _GREY_MULUQ(_grey_info.width, y & ~3) + (~y & 3);
#endif
#endif /* LCD_PIXELFORMAT */
dst = &_grey_info.data[idx].value;
src = dst + count * _GREY_X_ADVANCE;
end = dst + _grey_info.width * _GREY_X_ADVANCE;
do
{
*dst = *src;
dst += _GREY_X_ADVANCE;
src += _GREY_X_ADVANCE;
}
while (src < end);
do
{
*dst = blank;
dst += _GREY_X_ADVANCE;
}
while (dst < end);
}
}
/* Scroll right */
void grey_ub_scroll_right(int count)
{
unsigned char *dst, *src, *start;
int blank, y, idx;
if ((count == 0) || ((unsigned)count >= (unsigned)_grey_info.width))
return;
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
for (y = 0; y < _grey_info.height; y++)
{
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
idx = _GREY_MULUQ(_grey_info.width, y);
#else
#if LCD_DEPTH == 1
idx = _GREY_MULUQ(_grey_info.width, y & ~7) + (~y & 7);
#elif LCD_DEPTH == 2
idx = _GREY_MULUQ(_grey_info.width, y & ~3) + (~y & 3);
#endif
#endif /* LCD_PIXELFORMAT */
start = &_grey_info.data[idx].value;
dst = start + _grey_info.width * _GREY_X_ADVANCE;
src = dst - count * _GREY_X_ADVANCE;
do
{
dst -= _GREY_X_ADVANCE;
src -= _GREY_X_ADVANCE;
*dst = *src;
}
while (src > start);
do
{
dst -= _GREY_X_ADVANCE;
*dst = blank;
}
while (dst > start);
}
}
void grey_ub_scroll_up(int count)
{
unsigned char *dst, *dst_end, *src;
int blank, ys, yd, is, id;
if ((unsigned)count >= (unsigned)_grey_info.height)
return;
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
for (ys = count, yd = 0; ys < _grey_info.height; ys++, yd++)
{
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
id = _GREY_MULUQ(_grey_info.width, yd);
is = _GREY_MULUQ(_grey_info.width, ys);
#else
#if LCD_DEPTH == 1
id = _GREY_MULUQ(_grey_info.width, yd & ~7) + (~yd & 7);
is = _GREY_MULUQ(_grey_info.width, ys & ~7) + (~ys & 7);
#elif LCD_DEPTH == 2
id = _GREY_MULUQ(_grey_info.width, yd & ~3) + (~yd & 3);
is = _GREY_MULUQ(_grey_info.width, ys & ~3) + (~ys & 3);
#endif
#endif /* LCD_PIXELFORMAT */
dst = &_grey_info.data[id].value;
src = &_grey_info.data[is].value;
dst_end = dst + _grey_info.width * _GREY_X_ADVANCE;
do
{
*dst = *src;
dst += _GREY_X_ADVANCE;
src += _GREY_X_ADVANCE;
}
while (dst < dst_end);
}
for (; yd < _grey_info.height; yd++)
{
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
id = _GREY_MULUQ(_grey_info.width, yd);
#else
#if LCD_DEPTH == 1
id = _GREY_MULUQ(_grey_info.width, yd & ~7) + (~yd & 7);
#elif LCD_DEPTH == 2
id = _GREY_MULUQ(_grey_info.width, yd & ~3) + (~yd & 3);
#endif
#endif /* LCD_PIXELFORMAT */
dst = &_grey_info.data[id].value;
dst_end = dst + _grey_info.width * _GREY_X_ADVANCE;
do
{
*dst = blank;
dst += _GREY_X_ADVANCE;
}
while (dst < dst_end);
}
}
void grey_ub_scroll_down(int count)
{
unsigned char *dst, *dst_end, *src;
int blank, ys, yd, is, id;
if ((unsigned)count >= (unsigned)_grey_info.height)
return;
blank = (_grey_info.drawmode & DRMODE_INVERSEVID) ?
_grey_info.fg_val : _grey_info.bg_val;
yd = _grey_info.height - 1;
for (ys = yd - count; ys >= 0; ys--, yd--)
{
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
id = _GREY_MULUQ(_grey_info.width, yd);
is = _GREY_MULUQ(_grey_info.width, ys);
#else
#if LCD_DEPTH == 1
id = _GREY_MULUQ(_grey_info.width, yd & ~7) + (~yd & 7);
is = _GREY_MULUQ(_grey_info.width, ys & ~7) + (~ys & 7);
#elif LCD_DEPTH == 2
id = _GREY_MULUQ(_grey_info.width, yd & ~3) + (~yd & 3);
is = _GREY_MULUQ(_grey_info.width, ys & ~3) + (~ys & 3);
#endif
#endif /* LCD_PIXELFORMAT */
dst = &_grey_info.data[id].value;
src = &_grey_info.data[is].value;
dst_end = dst + _grey_info.width * _GREY_X_ADVANCE;
do
{
*dst = *src;
dst += _GREY_X_ADVANCE;
src += _GREY_X_ADVANCE;
}
while (dst < dst_end);
}
for (; yd >= 0; yd--)
{
#if LCD_PIXELFORMAT == HORIZONTAL_PACKING
id = _GREY_MULUQ(_grey_info.width, yd);
#else
#if LCD_DEPTH == 1
id = _GREY_MULUQ(_grey_info.width, yd & ~7) + (~yd & 7);
#elif LCD_DEPTH == 2
id = _GREY_MULUQ(_grey_info.width, yd & ~3) + (~yd & 3);
#endif
#endif /* LCD_PIXELFORMAT */
dst = &_grey_info.data[id].value;
dst_end = dst + _grey_info.width * _GREY_X_ADVANCE;
do
{
*dst = blank;
dst += _GREY_X_ADVANCE;
}
while (dst < dst_end);
}
}
#endif /* !SIMULATOR */
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