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|
/*
/--------------------------------------------------------------------
|
| $Id: plsdlbmp.cpp,v 1.3 2003/05/29 21:08:34 uzadow Exp $
| Bitmap class for SDL surfaces.
|
| Copyright (c) 1996-2002 Ulrich von Zadow
|
\--------------------------------------------------------------------
*/
#include "plstdpch.h"
#include "plsdlbmp.h"
#include "plexcept.h"
PLSDLBmp::PLSDLBmp
( int SurfFlags
) : m_pSurface(NULL),
m_SurfFlags(SurfFlags)
// Creates an empty bitmap.
{
internalCreate(16, 16, 32, false, false);
PLASSERT_VALID(this);
}
PLSDLBmp::~PLSDLBmp
()
{
// Free the memory.
freeMembers();
}
void PLSDLBmp::Attach
( SDL_Surface * pSurface
)
{
PLASSERT_VALID (this);
freeMembers ();
m_pSurface = pSurface;
m_SurfFlags = m_pSurface->flags;
m_pClrTab = NULL;
bool hasAlpha = false;
if (m_SurfFlags & SDL_SRCALPHA) {
hasAlpha = true;
}
initLocals (m_pSurface->w, m_pSurface->h, 32, hasAlpha, false);
PLASSERT_VALID (this);
}
#ifdef _DEBUG
void PLSDLBmp::AssertValid () const
{
PLBmp::AssertValid();
PLASSERT (m_bpp == 32);
PLASSERT (m_pSurface->format->BitsPerPixel == m_bpp);
PLASSERT (m_pSurface->w == m_Size.x);
PLASSERT (m_pSurface->h == m_Size.y);
PLASSERT (((m_SurfFlags & SDL_SRCALPHA) == SDL_SRCALPHA) == HasAlpha());
}
#endif
SDL_Surface * PLSDLBmp::GetSurface
()
{
return m_pSurface;
}
long PLSDLBmp::GetMemUsed
()
// Returns the memory used by the object.
{
PLASSERT_VALID (this);
return GetBytesPerLine()*GetHeight()*4+sizeof(SDL_Surface)+sizeof(*this);
}
long PLSDLBmp::GetBytesPerLine
()
// Returns number of bytes used per line.
{
return m_pSurface->pitch;
}
/////////////////////////////////////////////////////////////////////
// Static functions
long PLSDLBmp::GetBitsMemNeeded
( PLLONG width,
PLLONG height,
PLWORD BitsPerPixel
)
// Returns memory needed by bitmap bits. This is only approximate
// and doesn't take the stride into account.
{
// Calculate memory per line.
int LineMem = width*BitsPerPixel/8;
// Multiply by number of lines
return LineMem*height;
}
long PLSDLBmp::GetMemNeeded
( PLLONG width,
PLLONG height,
PLWORD BitsPerPixel
)
// Returns memory needed by a bitmap with the specified attributes.
// This is only approximate and doesn't take the stride into account.
// GetMemUsed is more accurate.
{
int HeaderMem = sizeof (PLSDLBmp);
if (BitsPerPixel < 16)
{ // Palette memory
HeaderMem += (1 << BitsPerPixel)*sizeof (PLPixel32);
}
return HeaderMem+GetBitsMemNeeded (width, height, BitsPerPixel);
}
/////////////////////////////////////////////////////////////////////
// Local functions
void PLSDLBmp::internalCreate
( PLLONG Width,
PLLONG Height,
PLWORD BitsPerPixel,
bool bAlphaChannel,
bool bIsGreyscale
)
// Create a new empty bitmap. Bits are uninitialized.
// Assumes that no memory is allocated before the call.
{
PLASSERT (BitsPerPixel==32);
// Create SDL memory surface.
#if SDL_BYTEORDER == SDL_BIG_ENDIAN
int rmask = 0xff000000;
int gmask = 0x00ff0000;
int bmask = 0x0000ff00;
int amask = 0x000000ff;
#else
int rmask = 0x000000ff;
int gmask = 0x0000ff00;
int bmask = 0x00ff0000;
int amask = 0xff000000;
#endif
if (bAlphaChannel) {
m_SurfFlags |= SDL_SRCALPHA;
} else {
amask = 0;
}
m_pSurface = SDL_CreateRGBSurface (m_SurfFlags, Width, Height, 32,
rmask, gmask, bmask, amask);
m_pClrTab = NULL;
initLocals (Width, Height, BitsPerPixel, bAlphaChannel, bIsGreyscale);
PLASSERT_VALID (this);
}
void PLSDLBmp::initLineArray
()
{
m_pLineArray = new PLBYTE * [m_Size.y];
int LineLen = GetBytesPerLine();
for (int y=0; y<m_Size.y; y++)
m_pLineArray[y] = (PLBYTE*)(m_pSurface->pixels) + y*LineLen;
}
void PLSDLBmp::freeMembers
()
{
SDL_FreeSurface (m_pSurface);
delete [] m_pLineArray;
m_pLineArray = NULL;
}
/*
/--------------------------------------------------------------------
|
| $Log: plsdlbmp.cpp,v $
| Revision 1.3 2003/05/29 21:08:34 uzadow
| Fixed SDL autoconf bug; fixed PLExif dependency on gcc > 3.0
|
| Revision 1.2 2003/03/08 15:15:51 uzadow
| Added PLSDLBmp::Attach().
|
| Revision 1.1 2003/03/08 14:32:08 uzadow
| Added support for bitmaps in SDL surface format.
|
|
\--------------------------------------------------------------------
*/
|
