rainmeter-studio/Library/MeterImage.cpp

/*
  Copyright (C) 2002 Kimmo Pekkola

  This program is free software; you can redistribute it and/or
  modify it under the terms of the GNU General Public License
  as published by the Free Software Foundation; either version 2
  of the License, or (at your option) any later version.

  This program 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 General Public License for more details.

  You should have received a copy of the GNU General Public License
  along with this program; if not, write to the Free Software
  Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
*/

#include "StdAfx.h"
#include "MeterImage.h"
#include "Measure.h"
#include "Error.h"
#include "Rainmeter.h"

extern CRainmeter* Rainmeter;

using namespace Gdiplus;

/*
** CMeterImage
**
** The constructor
**
*/
CMeterImage::CMeterImage(CMeterWindow* meterWindow) : CMeter(meterWindow)
{
	m_NeedsReload = false;
	m_WidthDefined = false;
	m_HeightDefined = false;
	m_PreserveAspectRatio = false;
}

/*
** ~CMeterImage
**
** The destructor
**
*/
CMeterImage::~CMeterImage()
{
}

/*
** Initialize
**
** Load the image and get the dimensions of the meter from it.
**
*/
void CMeterImage::Initialize()
{
	CMeter::Initialize();

	if (!m_DynamicVariables) LoadImage(true);
}

/*
** LoadImage
**
** Loads the image from disk
**
*/
void CMeterImage::LoadImage(bool bLoadAlways)
{
	m_Image.LoadImage(m_ImageName, bLoadAlways);

	if (m_Image.IsLoaded())
	{
		// Calculate size of the meter
		Bitmap* bitmap = m_Image.GetImage();

		int imageW = bitmap->GetWidth();
		int imageH = bitmap->GetHeight();

		if (m_WidthDefined)
		{
			if (!m_HeightDefined)
			{
				m_H = (imageW == 0) ? 0 : (int)(m_W * imageH / (double)imageW);
			}
		}
		else
		{
			if (m_HeightDefined)
			{
				m_W = (imageH == 0) ? 0 : (int)(m_H * imageW / (double)imageH);
			}
			else
			{
				m_W = imageW;
				m_H = imageH;
			}
		}
	}
}

/*
** ReadConfig
**
** Read the meter-specific configs from the ini-file.
**
*/
void CMeterImage::ReadConfig(const WCHAR* section)
{
	// Read common configs
	CMeter::ReadConfig(section);

	CConfigParser& parser = m_MeterWindow->GetParser();

	m_Path = parser.ReadString(section, L"Path", L"");
	if (!m_Path.empty())
	{
		WCHAR ch = m_Path[m_Path.length() - 1];
		if (ch != L'\\' && ch != L'/')
		{
			m_Path += L"\\";
		}
	}

	if (!m_Initialized || !m_Measure)
	{
		std::wstring oldImageName = m_ImageName;

		m_ImageName = parser.ReadString(section, L"ImageName", L"");
		if (!m_ImageName.empty())
		{
			m_ImageName.insert(0, m_Path);
			m_ImageName = m_MeterWindow->MakePathAbsolute(m_ImageName);
		}

		if (m_DynamicVariables)
		{
			m_NeedsReload = (oldImageName != m_ImageName);
		}
	}

	m_PreserveAspectRatio = 0!=parser.ReadInt(section, L"PreserveAspectRatio", 0);

	if (-1 != (int)parser.ReadFormula(section, L"W", -1))
	{
		m_WidthDefined = true;
	}
	if (-1 != (int)parser.ReadFormula(section, L"H", -1))
	{
		m_HeightDefined = true;
	}

	// Read tinting configs
	m_Image.ReadConfig(parser, section);
}

/*
** Update
**
** Updates the value(s) from the measures.
**
*/
bool CMeterImage::Update()
{
	if (CMeter::Update())
	{
		if (m_Measure)  //read from the measure
		{
			std::wstring val = m_Measure->GetStringValue(false, 1, 0, false);
			if (!val.empty())
			{
				val.insert(0, m_Path);
				val = m_MeterWindow->MakePathAbsolute(val);
				if (val != m_ImageName)
				{
					m_ImageName = val;
					LoadImage(true);
				}
				else
				{
					LoadImage(false);
				}
			}
			else if (m_Image.IsLoaded())
			{
				m_Image.DisposeImage();
			}
			return true;
		}
		else if (m_DynamicVariables)  //read from the skin
		{
			LoadImage(m_NeedsReload);
			return true;
		}
	}
	return false;
}

/*
** Draw
**
** Draws the meter on the double buffer
**
*/
bool CMeterImage::Draw(Graphics& graphics)
{
	if(!CMeter::Draw(graphics)) return false;

	if (m_Image.IsLoaded())
	{
		// Copy the image over the doublebuffer
		Bitmap* drawBitmap = m_Image.GetImage();

		int x = GetX();
		int y = GetY();
		int imageW = drawBitmap->GetWidth();
		int imageH = drawBitmap->GetHeight();

		int drawW, drawH;

		if (m_PreserveAspectRatio)
		{
			if (imageW == 0 || imageH == 0 || m_W == 0 || m_H == 0) return true;

			REAL imageRatio = imageW / (REAL)imageH;
			REAL meterRatio = m_W / (REAL)m_H;

			if (imageRatio >= meterRatio)
			{
				drawW = m_W;
				drawH = m_W * imageH / imageW;
			}
			else
			{
				drawW = m_H * imageW / imageH;
				drawH = m_H;
			}

			// Centering
			x += (m_W - drawW) / 2;
			y += (m_H - drawH) / 2;
		}
		else
		{
			drawW = m_W;
			drawH = m_H;
		}

		Rect r(x, y, drawW, drawH);
		graphics.DrawImage(drawBitmap, r, 0, 0, imageW, imageH, UnitPixel);
	}

	return true;
}

/*
** BindMeasure
**
** Overridden method. The Image meters need not to be bound on anything
**
*/
void CMeterImage::BindMeasure(const std::list<CMeasure*>& measures)
{
	// It's ok not to bind image meter to anything
	if (!m_MeasureName.empty())
	{
		CMeter::BindMeasure(measures);
	}
}