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#include "stdafx.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(nullptr), m_hDC(nullptr),
m_hBmp(nullptr), m_hOldBmp(nullptr)
{}
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, nullptr, 0, nullptr);
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 = nullptr;
m_hDC = CreateCompatibleDC(nullptr);
m_hBmp = CreateDIBSection(m_hDC, reinterpret_cast<BITMAPINFO*>(m_pBMIH), DIB_RGB_COLORS, reinterpret_cast<void**>(&pData), nullptr, 0);
}
m_hOldBmp = SelectObject(m_hDC, m_hBmp);
return m_hDC;
}
void Canvas::endDraw()
{
SelectObject(m_hDC, m_hOldBmp);
m_hOldBmp = nullptr;
}
bool Canvas::getDigest(Digest& digest)
{
// we don't have a digest if the image is uninitialized
if (!m_pBMIH)
return false;
// read data from DIB
int nSize = m_nLineLength * m_nHeight;
BYTE* pData = new BYTE[nSize];
memset(pData, 0, 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
mir_sha1_hash(pData, nSize, digest.m_Digest);
delete[] pData;
return true;
}
bool Canvas::writePNG(const wchar_t* szFileName)
{
IMGSRVC_INFO img = { 0 };
img.cbSize = sizeof(img);
img.dwMask = IMGI_HBITMAP;
img.hbm = m_hBmp;
img.fif = FIF_PNG;
img.szName.w = (wchar_t*)szFileName;
return Image_Save(&img, IMGL_WCHAR) == 0;
}
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