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/***************************************************************************

    bitmap.c

    Core bitmap routines.

****************************************************************************

    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 "bitmap.h"

#include <stdlib.h>

#ifdef __cplusplus
#include <new>
#endif


//**************************************************************************
//  BITMAP ALLOCATION/CONFIGURATION
//**************************************************************************

//-------------------------------------------------
//  bitmap_t - basic constructor
//-------------------------------------------------

bitmap_t::bitmap_t()
	: m_alloc(NULL),
	  m_palette(NULL)
{
	// deallocate intializes all other fields
	deallocate();
}


bitmap_t::bitmap_t(int width, int height, bitmap_format format, int xslop, int yslop)
	: m_alloc(NULL),
	  m_palette(NULL)
{
	// allocate intializes all other fields
	allocate(width, height, format, xslop, yslop);
}


bitmap_t::bitmap_t(void *base, int width, int height, int rowpixels, bitmap_format format)
	: m_alloc(NULL),
	  m_base(base),
	  m_rowpixels(rowpixels),
	  m_width(width),
	  m_height(height),
	  m_format(format),
	  m_bpp(format_to_bpp(format)),
	  m_palette(NULL),
	  m_cliprect(0, width - 1, 0, height - 1)
{
	// fail if invalid format
	if (m_bpp == 0)
		throw std::bad_alloc();
}


//-------------------------------------------------
//  ~bitmap_t - basic destructor
//-------------------------------------------------

bitmap_t::~bitmap_t()
{
	// delete any existing stuff
	deallocate();
}


//-------------------------------------------------
//  allocate -- (re)allocate memory for the bitmap
//  at the given size, destroying anything that
//  already exists
//-------------------------------------------------

void bitmap_t::allocate(int width, int height, bitmap_format format, int xslop, int yslop)
{
	// delete any existing stuff
	deallocate();

	// initialize fields
	m_rowpixels = (width + 2 * xslop + 7) & ~7;
	m_width = width;
	m_height = height;
	m_format = format;
	m_bpp = format_to_bpp(format);
	if (m_bpp == 0)
		throw std::bad_alloc();
	m_cliprect.set(0, width - 1, 0, height - 1);

	// allocate memory for the bitmap itself
	size_t allocbytes = m_rowpixels * (m_height + 2 * yslop) * m_bpp / 8;
	m_alloc = new UINT8[allocbytes];

	// clear to 0 by default
	memset(m_alloc, 0, allocbytes);

	// compute the base
	m_base = m_alloc + (m_rowpixels * yslop + xslop) * (m_bpp / 8);
}


//-------------------------------------------------
//  deallocate -- reset to an invalid bitmap,
//  deleting all allocated stuff
//-------------------------------------------------

void bitmap_t::deallocate()
{
	// delete any existing stuff
	set_palette(NULL);
	delete[] m_alloc;
	m_alloc = NULL;
	m_base = NULL;

	// reset all fields
	m_rowpixels = 0;
	m_width = 0;
	m_height = 0;
	m_format = BITMAP_FORMAT_INVALID;
	m_bpp = 0;
	m_cliprect.set(0, -1, 0, -1);
}


//-------------------------------------------------
//  clone_existing -- clone an existing bitmap by
//  copying its fields; the target bitmap does not
//  own the memory
//-------------------------------------------------

void bitmap_t::clone_existing(const bitmap_t &srcbitmap)
{
	// free any allocated storage
	delete[] m_alloc;
	m_alloc = NULL;

	// copy relevant fields
	m_base = srcbitmap.m_base;
	m_rowpixels = srcbitmap.m_rowpixels;
	m_width = srcbitmap.m_width;
	m_height = srcbitmap.m_height;
	m_format = srcbitmap.m_format;
	m_bpp = srcbitmap.m_bpp;
	m_palette = srcbitmap.m_palette;
	m_cliprect = srcbitmap.m_cliprect;
}


//-------------------------------------------------
//  set_palette -- associate a palette with a
//  bitmap
//-------------------------------------------------

void bitmap_t::set_palette(palette_t *palette)
{
	// first dereference any existing palette
	if (m_palette != NULL)
	{
		palette_deref(m_palette);
		m_palette = NULL;
	}

	// then reference any new palette
	if (palette != NULL)
	{
		palette_ref(palette);
		m_palette = palette;
	}
}


//-------------------------------------------------
//  fill -- fill a bitmap with a solid color
//-------------------------------------------------

void bitmap_t::fill(UINT32 color, const rectangle &cliprect)
{
	// if we have a cliprect, intersect with that
	rectangle fill = cliprect;
	fill &= m_cliprect;
	if (fill.empty())
		return;

	// based on the bpp go from there
	switch (m_bpp)
	{
		case 8:
			// 8bpp always uses memset
			for (INT32 y = fill.min_y; y <= fill.max_y; y++)
				memset(&pix8(y, fill.min_x), (UINT8)color, fill.max_x + 1 - fill.min_x);
			break;

		case 16:
			// 16bpp can use memset if the bytes are equal
			if ((UINT8)(color >> 8) == (UINT8)color)
			{
				for (INT32 y = fill.min_y; y <= fill.max_y; y++)
					memset(&pix16(y, fill.min_x), (UINT8)color, (fill.max_x + 1 - fill.min_x) * 2);
			}
			else
			{
				// Fill the first line the hard way
				UINT16 *destrow = &pix16(fill.min_y);
				for (INT32 x = fill.min_x; x <= fill.max_x; x++)
					destrow[x] = (UINT16)color;

				// For the other lines, just copy the first one
				UINT16 *destrow0 = &pix16(fill.min_y, fill.min_x);
				for (INT32 y = fill.min_y + 1; y <= fill.max_y; y++)
				{
					destrow = &pix16(y, fill.min_x);
					memcpy(destrow, destrow0, (fill.max_x + 1 - fill.min_x) * 2);
				}
			}
			break;

		case 32:
			// 32bpp can use memset if the bytes are equal
			if ((UINT8)(color >> 8) == (UINT8)color && (UINT16)(color >> 16) == (UINT16)color)
			{
				for (INT32 y = fill.min_y; y <= fill.max_y; y++)
					memset(&pix32(y, fill.min_x), (UINT8)color, (fill.max_x + 1 - fill.min_x) * 4);
			}
			else
			{
				// Fill the first line the hard way
				UINT32 *destrow  = &pix32(fill.min_y);
				for (INT32 x = fill.min_x; x <= fill.max_x; x++)
					destrow[x] = (UINT32)color;

				// For the other lines, just copy the first one
				UINT32 *destrow0 = &pix32(fill.min_y, fill.min_x);
				for (INT32 y = fill.min_y + 1; y <= fill.max_y; y++)
				{
					destrow = &pix32(y, fill.min_x);
					memcpy(destrow, destrow0, (fill.max_x + 1 - fill.min_x) * 4);
				}
			}
			break;

		case 64:
			// 64bpp can use memset if the bytes are equal
			if ((UINT8)(color >> 8) == (UINT8)color && (UINT16)(color >> 16) == (UINT16)color)
			{
				for (INT32 y = fill.min_y; y <= fill.max_y; y++)
					memset(&pix64(y, fill.min_x), (UINT8)color, (fill.max_x + 1 - fill.min_x) * 8);
			}
			else
			{
				// Fill the first line the hard way
				UINT64 *destrow  = &pix64(fill.min_y);
				for (INT32 x = fill.min_x; x <= fill.max_x; x++)
					destrow[x] = (UINT64)color;

				// For the other lines, just copy the first one
				UINT64 *destrow0 = &pix64(fill.min_y, fill.min_x);
				for (INT32 y = fill.min_y + 1; y <= fill.max_y; y++)
				{
					destrow = &pix64(y, fill.min_x);
					memcpy(destrow, destrow0, (fill.max_x + 1 - fill.min_x) * 4);
				}
			}
			break;
	}
}


//-------------------------------------------------
//  format_to_bpp - given a format, return the bpp
//-------------------------------------------------

UINT8 bitmap_t::format_to_bpp(bitmap_format format)
{
	// choose a depth for the format
	switch (format)
	{
		case BITMAP_FORMAT_INDEXED8:
			return 8;

		case BITMAP_FORMAT_INDEXED16:
		case BITMAP_FORMAT_RGB15:
		case BITMAP_FORMAT_YUY16:
			return 16;

		case BITMAP_FORMAT_INDEXED32:
		case BITMAP_FORMAT_RGB32:
		case BITMAP_FORMAT_ARGB32:
			return 32;

		case BITMAP_FORMAT_INDEXED64:
			return 64;

		default:
			break;
	}
	return 0;
}