bitmap.cpp

MONA是为数不多的C++语言编写的一个很小的操作系统

// This file is in the public domain.
// There are no restrictions on any sort of usage of this file.

#ifdef MONA
#include <monapi.h>
#include <monapi/messages.h>

extern dword __gui_server;
#endif

#include <gui/System/Pointer.h>
#include <gui/System/Drawing/Bitmap.h>

namespace System { namespace Drawing
{
	Bitmap::Bitmap(int width, int height)
	{
		int len = width * height;
		Color white = Color::get_White();
#ifdef MONA
		MessageInfo msg;
		if (MonAPI::Message::sendReceive(&msg, __gui_server, MSG_GUISERVER_CREATEBITMAP, width, height, white.ToArgb()) != 0)
		{
			::printf("%s:%d:ERROR: can not connect to GUI server!\n", __FILE__, __LINE__);
			return;
		}
		if (msg.arg2 == 0) return;
		
		this->_object = (guiserver_bitmap*)MonAPI::MemoryMap::map(msg.arg2);
		if (this->_object == NULL)
		{
			::printf("%s:%d:ERROR: can not get image data!\n", __FILE__, __LINE__);
			return;
		}
		
		this->buffer.Set((Color*)this->_object->Data, len, false);
#else
		this->buffer.Alloc(len);
		this->_object = NULL;
		for (int i = 0; i < len; i++) this->buffer[i] = white;
#endif
		this->width  = width;
		this->height = height;
	}
	
	Bitmap::Bitmap(String fileName)
	{
		this->_object = NULL;
#ifdef MONA
		int fnlen = fileName.get_Length();
		if (fnlen > 127) fnlen = 127;
		_A<char> fn(fnlen + 1);
		for (int i = 0; i < fnlen; i++)
		{
			wchar ch = fileName[i];
			fn[i] = ch < 0x80 ? (char)ch : '?';
		}
		fn[fnlen] = '\0';
		
		MessageInfo msg;
		if (MonAPI::Message::sendReceive(&msg, __gui_server, MSG_GUISERVER_DECODEIMAGE, 0, 0, 0, fn.get()) != 0)
		{
			::printf("%s:%d:ERROR: can not connect to GUI server!\n", __FILE__, __LINE__);
			return;
		}
		if (msg.arg2 == 0) return;
		
		this->_object = (guiserver_bitmap*)MonAPI::MemoryMap::map(msg.arg2);
		if (this->_object == NULL)
		{
			::printf("%s:%d:ERROR: can not get image data!\n", __FILE__, __LINE__);
			return;
		}
		
		this->width  = this->_object->Width;
		this->height = this->_object->Height;
		int len = this->width * this->height;
		this->buffer.Set((Color*)this->_object->Data, len, false);
#endif
	}
	
	Bitmap::~Bitmap()
	{
		this->Dispose();
	}
	
	void Bitmap::Dispose()
	{
		if (this->_object == NULL) return;
		
#ifdef MONA
		this->buffer.Unset();
		dword handle = this->get_Handle();
		MonAPI::MemoryMap::unmap(handle);
		if (MonAPI::Message::send(__gui_server, MSG_GUISERVER_DISPOSEBITMAP, handle) != 0)
		{
			::printf("%s:%d:ERROR: can not connect to GUI server!\n", __FILE__, __LINE__);
		}
		this->_object = NULL;
#endif
	}
	
	void Bitmap::SetPixel(int x, int y, Color c)
	{
		if (x < 0 || this->width <= x || y < 0 || this->height <= y) return;
		
		int a = c.get_A();
		if (a == 0) return;
		
		int index = x + y * this->width;
		if (a == 0xff)
		{
			this->buffer[index] = c;
		}
		else
		{
			Color cc = this->buffer[index];
			int r = (cc.get_R() * (255 - a) + c.get_R() * a) / 255;
			int g = (cc.get_G() * (255 - a) + c.get_G() * a) / 255;
			int b = (cc.get_B() * (255 - a) + c.get_B() * a) / 255;
			this->buffer[index] = Color::FromArgb(0xff, r, g, b);
		}
	}
}}