From 6b3ded37e4a4825be2df3612bdcbb7dfc00a1800 Mon Sep 17 00:00:00 2001
From: George Hazan <george.hazan@gmail.com>
Date: Tue, 4 Mar 2014 20:41:13 +0000
Subject: HistoryStats sources

git-svn-id: http://svn.miranda-ng.org/main/trunk@8397 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c
---
 plugins/!NotAdopted/HistoryStats/canvas.cpp | 228 ++++++++++++++++++++++++++++
 1 file changed, 228 insertions(+)
 create mode 100644 plugins/!NotAdopted/HistoryStats/canvas.cpp

(limited to 'plugins/!NotAdopted/HistoryStats/canvas.cpp')

diff --git a/plugins/!NotAdopted/HistoryStats/canvas.cpp b/plugins/!NotAdopted/HistoryStats/canvas.cpp
new file mode 100644
index 0000000000..2444432ad1
--- /dev/null
+++ b/plugins/!NotAdopted/HistoryStats/canvas.cpp
@@ -0,0 +1,228 @@
+#include "_globals.h"
+#include "canvas.h"
+
+void Canvas::updateTrans(BYTE* pData)
+{
+	// MEMO: this follwing transparency code only makes sense for m_nChannels == 4
+	assert(m_nChannels == 4);
+
+	// apply transparency, if any
+	if (m_bTransColor)
+	{
+		for (int y = 0; y < m_nHeight; ++y)
+		{
+			COLORREF* pValue = reinterpret_cast<COLORREF*>(pData + y * m_nLineLength);
+
+			for (int x = 0; x < m_nWidth; ++x)
+			{
+				*pValue = (*pValue & 0x00FFFFFF) | ((*pValue & 0x00FFFFFF) == m_TransColor ? 0x00000000 : 0xFF000000);
+				++pValue;
+			}
+		}
+	}
+	else
+	{
+		for (int y = 0; y < m_nHeight; ++y)
+		{
+			COLORREF* pValue = reinterpret_cast<COLORREF*>(pData + y * m_nLineLength);
+
+			for (int x = 0; x < m_nWidth; ++x)
+			{
+				*pValue |= 0xFF000000;
+				++pValue;
+			}
+		}
+	}
+}
+
+Canvas::Canvas(int nWidth, int nHeight)
+	: m_nChannels(4)
+	, m_nWidth(nWidth)
+	, m_nHeight(nHeight)
+	, m_nLineLength((m_nChannels * m_nWidth + 3) & ~0x3)
+	, m_bTransColor(false)
+	, m_TransColor(0)
+	, m_pBMIH(NULL)
+{
+}
+
+Canvas::~Canvas()
+{
+	if (m_hOldBmp)
+	{
+		SelectObject(m_hDC, m_hOldBmp);
+	}
+
+	if (m_hBmp)
+	{
+		DeleteObject(m_hBmp);
+	}
+
+	if (m_hDC)
+	{
+		DeleteDC(m_hDC);
+	}
+
+	delete m_pBMIH;
+}
+
+void Canvas::setTrans(COLORREF transColor, bool bFill /* = false */)
+{
+	m_bTransColor = true;
+	m_TransColor = transColor;
+
+	if (bFill)
+	{
+		fillBackground(transColor);
+	}
+}
+
+void Canvas::fillBackground(COLORREF bkColor)
+{
+	HDC hDC = beginDraw();
+
+	RECT rAll = { 0, 0, m_nWidth, m_nHeight };
+
+	SetBkColor(hDC, bkColor);
+	ExtTextOut(hDC, 0, 0, ETO_OPAQUE, &rAll, NULL, 0, NULL);
+
+	endDraw();
+}
+
+HDC Canvas::beginDraw()
+{
+	if (!m_pBMIH)
+	{
+		m_pBMIH = new BITMAPINFOHEADER;
+
+		m_pBMIH->biSize = sizeof(BITMAPINFOHEADER);
+		m_pBMIH->biWidth = m_nWidth;
+		m_pBMIH->biHeight = m_nHeight;
+		m_pBMIH->biPlanes = 1;
+		m_pBMIH->biBitCount = 8 * m_nChannels;
+		m_pBMIH->biCompression = BI_RGB;
+		m_pBMIH->biSizeImage = m_nChannels * m_nWidth * m_nHeight;
+		m_pBMIH->biXPelsPerMeter = 0;
+		m_pBMIH->biYPelsPerMeter = 0;
+		m_pBMIH->biClrUsed = 0;
+		m_pBMIH->biClrImportant = 0;
+
+		BYTE* pData = 0;
+
+		m_hDC = CreateCompatibleDC(NULL);
+		m_hBmp = CreateDIBSection(m_hDC, reinterpret_cast<BITMAPINFO*>(m_pBMIH), DIB_RGB_COLORS, reinterpret_cast<void**>(&pData), NULL, 0);
+	}
+
+	m_hOldBmp = SelectObject(m_hDC, m_hBmp);
+
+	return m_hDC;
+}
+
+void Canvas::endDraw()
+{
+	SelectObject(m_hDC, m_hOldBmp);
+	m_hOldBmp = NULL;
+}
+
+bool Canvas::getDigest(Digest& digest)
+{
+	// we don't have a digest if the image is uninitialized
+	if (!m_pBMIH)
+	{
+		return false;
+	}
+
+	if (mu::sha1::_available())
+	{
+		// read data from DIB
+		int nSize = m_nLineLength * m_nHeight;
+		BYTE* pData = new BYTE[nSize];
+
+		ZeroMemory(pData, nSize);
+
+		if (GetDIBits(m_hDC, m_hBmp, 0, m_nHeight, pData, reinterpret_cast<BITMAPINFO*>(m_pBMIH), DIB_RGB_COLORS) != m_nHeight)
+		{
+			delete[] pData;
+
+			return false;
+		}
+
+		// apply transparency, if any
+		updateTrans(pData);
+
+		// calculate hash
+		SHA1_INTERFACE sha1i = mu::sha1::getInterface();
+
+		sha1i.sha1_hash(pData, nSize, digest.m_Digest);
+
+		delete[] pData;
+	}
+	else
+	{
+		// fallback digest if no SHA1 interface is available
+		static int nUniqueID = 0;
+
+		*reinterpret_cast<int*>(digest.m_Digest) = ++nUniqueID;
+	}
+
+	return true;
+}
+
+bool Canvas::writePNG(const mu_text* szFileName)
+{
+	// read data from DIB
+	BYTE* pData = new BYTE[m_nLineLength * m_nHeight];
+
+	if (GetDIBits(m_hDC, m_hBmp, 0, m_nHeight, pData, reinterpret_cast<BITMAPINFO*>(m_pBMIH), DIB_RGB_COLORS) != m_nHeight)
+	{
+		delete[] pData;
+
+		return false;
+	}
+
+	// apply transparency, if any
+	updateTrans(pData);
+
+	// calculate resulting image size
+	long png_len = 0;
+
+	if (!mu::png::dibToPng(m_pBMIH, pData, 0, &png_len) || png_len == 0)
+	{
+		delete[] pData;
+
+		return false;
+	}
+
+	// get the resulting image data
+	BYTE* pRawPNG = new BYTE[png_len];
+
+	png_len = 0;
+
+	if (!mu::png::dibToPng(m_pBMIH, pData, pRawPNG, &png_len))
+	{
+		delete[] pData;
+		delete[] pRawPNG;
+
+		return false;
+	}
+
+	// write image data to file
+	FILE* fp = _tfopen(szFileName, muT("wb"));
+
+	if (!fp)
+	{
+		delete[] pData;
+		delete[] pRawPNG;
+
+		return false;
+	}
+
+	fwrite(pRawPNG, 1, png_len, fp);
+	fclose(fp);
+
+	// free buffers
+	delete[] pRawPNG;
+	delete[] pData;
+
+	return true;
+}
-- 
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