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/***************************************************************************
General sprite handling helpers
****************************************************************************
Copyright Aaron Giles
All rights reserved.
Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are
met:
* Redistributions of source code must retain the above copyright
notice, this list of conditions and the following disclaimer.
* 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.
* Neither the name 'MAME' 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 AARON GILES ''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 AARON GILES 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.
***************************************************************************/
#include "emu.h"
#include "sprite.h"
//-------------------------------------------------
// sparse_dirty_bitmap -- constructor
//-------------------------------------------------
sparse_dirty_bitmap::sparse_dirty_bitmap(int granularity)
: m_width(0),
m_height(0),
m_granularity(granularity),
m_rect_list_bounds(0, -1, 0, -1)
{
}
sparse_dirty_bitmap::sparse_dirty_bitmap(int width, int height, int granularity)
: m_width(0),
m_height(0),
m_granularity(granularity),
m_rect_list_bounds(0, -1, 0, -1)
{
// resize to the specified width/height
resize(width, height);
}
//-------------------------------------------------
// dirty -- dirty a region
//-------------------------------------------------
void sparse_dirty_bitmap::dirty(INT32 left, INT32 right, INT32 top, INT32 bottom)
{
// compute a rectangle in dirty space, and fill it with 1
rectangle rect(left >> m_granularity, right >> m_granularity, top >> m_granularity, bottom >> m_granularity);
m_bitmap.fill(1, rect);
// invalidate existing rect list
invalidate_rect_list();
}
//-------------------------------------------------
// clean a region -- dirty a region
//-------------------------------------------------
void sparse_dirty_bitmap::clean(INT32 left, INT32 right, INT32 top, INT32 bottom)
{
// if right or bottom intersect the edge of the bitmap, round up
int round = (1 << m_granularity) - 1;
if (right >= m_width - 1)
right = m_width + round;
if (bottom >= m_height - 1)
bottom = m_height + round;
// compute a rectangle in dirty space, and fill it with 0
rectangle rect((left + round) >> m_granularity, (right - round) >> m_granularity, (top + round) >> m_granularity, (bottom - round) >> m_granularity);
m_bitmap.fill(0, rect);
// invalidate existing rect list
invalidate_rect_list();
}
//-------------------------------------------------
// resize -- resize the bitmap
//-------------------------------------------------
void sparse_dirty_bitmap::resize(int width, int height)
{
// set new size
m_width = width;
m_height = height;
// resize the bitmap
int round = (1 << m_granularity) - 1;
m_bitmap.resize((width + round) >> m_granularity, (height + round) >> m_granularity);
// reset everything
dirty_all();
}
//-------------------------------------------------
// first_dirty_rect -- return the first dirty
// rectangle in the list
//-------------------------------------------------
sparse_dirty_rect *sparse_dirty_bitmap::first_dirty_rect(const rectangle &cliprect)
{
// if what we have is valid, just return it again
if (m_rect_list_bounds == cliprect)
return m_rect_list.first();
// reclaim the dirty list and start over
m_rect_allocator.reclaim_all(m_rect_list);
// compute dirty space rectangle coordinates
int sx = cliprect.min_x >> m_granularity;
int ex = cliprect.max_x >> m_granularity;
int sy = cliprect.min_y >> m_granularity;
int ey = cliprect.max_y >> m_granularity;
int tilesize = 1 << m_granularity;
// loop over all grid rows that intersect our cliprect
for (int y = sy; y <= ey; y++)
{
UINT8 *dirtybase = &m_bitmap.pix(y);
sparse_dirty_rect *currect = NULL;
// loop over all grid columns that intersect our cliprect
for (int x = sx; x <= ex; x++)
{
// if this tile is not dirty, end our current run and continue
if (!dirtybase[x])
{
if (currect != NULL)
*currect &= cliprect;
currect = NULL;
continue;
}
// if we can't add to an existing rect, create a new one
if (currect == NULL)
{
// allocate a new rect and add it to the list
currect = &m_rect_list.append(*m_rect_allocator.alloc());
// make a rect describing this grid square
currect->min_x = x << m_granularity;
currect->max_x = currect->min_x + tilesize - 1;
currect->min_y = y << m_granularity;
currect->max_y = currect->min_y + tilesize - 1;
}
// if we can add to the previous rect, just expand its width
else
currect->max_x += tilesize;
}
// clip the last rect to the cliprect
if (currect != NULL)
*currect &= cliprect;
}
// mark the list as valid
m_rect_list_bounds = cliprect;
return m_rect_list.first();
}
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