gfxImageSurface::gfxImageSurface(const gfxIntSize& size, gfxImageFormat format) :
mSize(size), mFormat(format)
{
mStride = ComputeStride();
if (!CheckSurfaceSize(size))
return;
// if we have a zero-sized surface, just set mData to nsnull
if (mSize.height * mStride > 0) {
mData = (unsigned char *) malloc(mSize.height * mStride);
if (!mData)
return;
} else {
mData = nsnull;
}
mOwnsData = PR_TRUE;
cairo_surface_t *surface =
cairo_image_surface_create_for_data((unsigned char*)mData,
(cairo_format_t)format,
mSize.width,
mSize.height,
mStride);
Init(surface);
}
// TODO: Add meaningful return values
int Surface::LoadBMP( const IDataStream& Stream )
{
SBitmapFileHeader BMPFileHeader;
SBitmapInfoHeader BMPInfoHeader;
Stream.Read( sizeof( SBitmapFileHeader ), &BMPFileHeader );
Stream.Read( sizeof( SBitmapInfoHeader ), &BMPInfoHeader );
int Width = BMPInfoHeader.m_Width;
int Height = BMPInfoHeader.m_Height;
int Stride = ComputeStride( BMPInfoHeader.m_Width, BMPInfoHeader.m_BitCount );
Reset( Width, Height, BMPInfoHeader.m_BitCount );
#if BUILD_WINDOWS_NO_SDL
Stream.Read( Stride * Height, m_pPixels );
#endif
#if BUILD_SDL
// SDL stores surfaces from top to bottom, so flip the rows
byte* pPixels = m_pPixels + ( ( Height - 1 ) * Stride );
for( int Row = 0; Row < Height; ++Row, pPixels -= Stride )
{
Stream.Read( Stride, pPixels );
}
#endif
return 0;
}
void Surface::Reset( int Width, int Height, int BitCount )
{
#if BUILD_WINDOWS_NO_SDL
if( m_BMP )
{
SelectObject( m_hDC, m_OldBMP );
DeleteObject( m_BMP );
}
if( !m_hDC )
{
m_hDC = CreateCompatibleDC( NULL ); // Could take a window's DC, but this should work for now
}
#endif
m_BitmapInfo.m_Header.m_Size = sizeof( m_BitmapInfo.m_Header );
m_Width = m_BitmapInfo.m_Header.m_Width = Width;
m_Height = m_BitmapInfo.m_Header.m_Height = Height;
m_BitmapInfo.m_Header.m_Planes = 1;
m_BitmapInfo.m_Header.m_BitCount = static_cast<uint16>( BitCount );
m_BitmapInfo.m_Header.m_Compression = 0; // BI_RGB
m_Stride = ComputeStride( m_Width, BitCount );
m_Padding = ComputePadding();
#if BUILD_WINDOWS_NO_SDL
// NOTE: This only supports 24-bit images! 32-bit was added for SDL icon support only.
BITMAPINFO* const pBitmapInfo = reinterpret_cast<BITMAPINFO*>( &m_BitmapInfo );
m_BMP = CreateDIBSection( m_hDC, pBitmapInfo, DIB_RGB_COLORS, (void**)&m_pPixels, NULL, NULL );
m_OldBMP = (HBITMAP)SelectObject( m_hDC, m_BMP );
#endif
#if BUILD_SDL
m_Surface = SDL_CreateRGBSurface( 0, m_Width, m_Height, BitCount, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000 );
ASSERT( m_Surface );
ASSERT( !SDL_MUSTLOCK( m_Surface ) ); // Surfaces are always in RAM now, so there's no reason they should need to be locked.
m_pPixels = static_cast<byte*>( m_Surface->pixels );
#endif
m_ViewportLeft = 0;
m_ViewportTop = 0;
m_ViewportRight = m_Width;
m_ViewportBottom = m_Height;
}
