dc_buffer_generic.cpp

这是一款2d游戏引擎

/*  $Id: dc_buffer_generic.cpp,v 1.9 2003/09/24 18:26:57 sphair Exp $
**
**  ClanLib Game SDK
**  Copyright (C) 2003  The ClanLib Team
**  For a total list of contributers see the file CREDITS.
**
**  This library is free software; you can redistribute it and/or
**  modify it under the terms of the GNU Lesser General Public
**  License as published by the Free Software Foundation; either
**  version 2.1 of the License, or (at your option) any later version.
**
**  This library is distributed in the hope that it will be useful,
**  but WITHOUT ANY WARRANTY; without even the implied warranty of
**  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
**  Lesser General Public License for more details.
**
**  You should have received a copy of the GNU Lesser General Public
**  License along with this library; if not, write to the Free Software
**  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307  USA
*/

#include "Display/display_precomp.h"
#include "dc_buffer_generic.h"

// Define DIBSECTION to share pixelbuffer data with GDI. Currently fucks up colors tho.
// #define USE_DIBSECTION

/////////////////////////////////////////////////////////////////////////////
// CL_DeviceContextBuffer_Generic construction:

CL_DeviceContextBuffer_Generic::CL_DeviceContextBuffer_Generic(HDC reference_dc, int bitmap_width, int bitmap_height, bool monocrome_alpha)
{
	ref_dc = reference_dc;

	// Find the pixelformat properties for the reference DC:
	unsigned int red_mask   = 0xff0000;
	unsigned int green_mask = 0x00ff00;
	unsigned int blue_mask  = 0x0000ff;

	// Setup pixelbuffer format info:
	if (monocrome_alpha)
	{
		format.set_red_mask(red_mask);
		format.set_green_mask(red_mask);
		format.set_blue_mask(red_mask);
		format.set_alpha_mask(blue_mask);
		format.set_depth(32);
	}
	else
	{
		format.set_red_mask(red_mask);
		format.set_green_mask(green_mask);
		format.set_blue_mask(blue_mask);
		format.set_alpha_mask(0);
		format.set_depth(32);
	}
	width = bitmap_width;
	height = bitmap_height;
	pitch = width*4;

	// Create DC and bitmap for pixelbuffer:
	memory_dc = CreateCompatibleDC(ref_dc);

	memset(&bitmap_info, 0, sizeof(BITMAPINFO));
	bitmap_info.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
	bitmap_info.bmiHeader.biWidth = width;
	bitmap_info.bmiHeader.biHeight = -height;
	bitmap_info.bmiHeader.biPlanes = 1;
	bitmap_info.bmiHeader.biBitCount = 32;
	bitmap_info.bmiHeader.biCompression = BI_BITFIELDS;
	bitmap_info.bmiHeader.biSizeImage = pitch*height;
	bitmap_info.bmiColors[0].rgbRed = red_mask;
	bitmap_info.bmiColors[0].rgbGreen = green_mask;
	bitmap_info.bmiColors[0].rgbBlue = blue_mask;
#ifdef USE_DIBSECTION
	bitmap = CreateDIBSection(ref_dc, &bitmap_info, DIB_RGB_COLORS, (LPVOID *) &data, 0, 0);
#else
	bitmap = CreateCompatibleBitmap(ref_dc, width, height);
	first_lock = true;
	data = 0;
#endif

	orig_bitmap = (HBITMAP) SelectObject(memory_dc, bitmap);
}

CL_DeviceContextBuffer_Generic::~CL_DeviceContextBuffer_Generic()
{
#ifndef USE_DIBSECTION
	delete[] data;
#endif

	SelectObject(memory_dc, orig_bitmap);
	DeleteObject(bitmap);
	DeleteDC(memory_dc);
}

/////////////////////////////////////////////////////////////////////////////
// CL_DeviceContextBuffer_Generic operations:

void *CL_DeviceContextBuffer_Generic::get_data()
{
	return data;
}

void CL_DeviceContextBuffer_Generic::perform_lock()
{
#ifdef USE_DIBSECTION
	// We call GdiFlush() here to ensure that any operations on the device context actually finished when
	// application start accessing the data.
	GdiFlush();
#else
	if (first_lock)
	{
		data = new unsigned char[pitch*height];

		/*int scanlines =*/ GetDIBits(memory_dc, bitmap, 0, height, data, &bitmap_info, DIB_RGB_COLORS);
		first_lock = false;
	}
#endif
}

void CL_DeviceContextBuffer_Generic::perform_unlock()
{
}

/////////////////////////////////////////////////////////////////////////////
// CL_DeviceContextBuffer_Generic implementation: