技术标签: C++、Qt Gdi jpg 绘图
1.Gdi的调用
链接附加依赖项:gdiplus.lib
#include <comdef.h>//(不加这个可能会报错)
#include <GdiPlus.h>
//开始调用
ULONG_PTR g_pGdiToken = NULL;
Gdiplus::GdiplusStartupInput g_gdiplusStartupInput;
Gdiplus::GdiplusStartup(&g_pGdiToken, &g_gdiplusStartupInput, NULL);
//结束调用
Gdiplus::GdiplusShutdown(g_pGdiToken);
2.Jpg转Gdi bitmap
在开始之前事先申请内存(临时new的时候不行,不知道为啥)
m_hImageMemPic = GlobalAlloc(GMEM_FIXED, MAXPICBUF);
// Jpg转换为Image;
bool JPG2Image(void *szBuf, DWORD dwBufSize)
{
HGLOBAL hMem = m_hImageMemPic;
Gdiplus::Image** ppImage = &m_pImagePic;
m_sizePicOut.cx = 0;
m_sizePicOut.cy = 0;
int nMaxLen = MAXPICBUF;
BOOL bAlloc = FALSE;
if (hMem == NULL)
{
bAlloc = TRUE;
hMem = GlobalAlloc(GMEM_FIXED, nMaxLen);
}
if (*ppImage != NULL)
{
delete *ppImage;
*ppImage = NULL;
}
if (dwBufSize != 0)
{
IStream* pStmBmp = NULL;
CreateStreamOnHGlobal(hMem, FALSE, &pStmBmp);
BYTE* pbyBmp = (BYTE *)GlobalLock(hMem);
memset(pbyBmp, 0, nMaxLen);
memcpy(pbyBmp, szBuf, dwBufSize);
::GlobalUnlock(hMem);
*ppImage = Gdiplus::Image::FromStream(pStmBmp, FALSE);
if ((*ppImage) != NULL)
{
m_sizePicOut.cx = (*ppImage)->GetWidth();
m_sizePicOut.cy = (*ppImage)->GetHeight();
}
}
if (bAlloc)
{
GlobalFree(hMem);
}
return ((*ppImage) != NULL);
/*CLSID pngClsid;
GetEncoderClsid(L"image/bmp", &pngClsid);
m_pImagePic->Save(L"Mosaic245.bmp", &pngClsid, NULL);*/
}
3.Gdi绘制图片
HDC hdc = GetDC(NULL);
HDC hTempMemDC = ::CreateCompatibleDC(NULL);
HBITMAP bmpTmpDraw = ::CreateCompatibleBitmap(hdc, m_sizePicOut.cx, m_sizePicOut.cy);//hdc
if (bmpTmpDraw == NULL) bmpTmpDraw = ::CreateCompatibleBitmap(hdc, m_sizePicOut.cx, m_sizePicOut.cy);
if (bmpTmpDraw == NULL)
{
return;
}
HGDIOBJ oldObj = ::SelectObject(hTempMemDC, bmpTmpDraw);
RECT rc;
rc.left = 0;
rc.top = 0;
rc.right = m_sizePicOut.cx;
rc.bottom = m_sizePicOut.cy;
if (pImage)
{
Gdiplus::Graphics g(hdc);
Gdiplus::ImageAttributes ImgAtt;
ImgAtt.SetWrapMode(Gdiplus::WrapModeTileFlipXY);
g.DrawImage(pImage, Gdiplus::Rect(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top),
0, 0, pImage->GetWidth(), pImage->GetHeight(),
Gdiplus::UnitPixel, &ImgAtt, NULL, NULL);
}
4. 绘制字体
LOGFONTW lfont;
memset(&lfont, 0, sizeof(lfont));
int emSize = 70;
lfont.lfHeight = -emSize; // nHeight 注意使用负值,表示character height, 正值表示 cell height
lfont.lfWeight = 400;//100;//FW_NORMAL, //nWeight
lfont.lfCharSet = GB2312_CHARSET;//;//ANSI_CHARSET
wcscpy(lfont.lfFaceName, (L"微软雅黑")); // lpszFacename
Gdiplus::Font gdifont(hdc, &lfont);
Gdiplus::StringFormat strformat;
strformat.SetAlignment(Gdiplus::StringAlignmentNear);//水平居左
strformat.SetLineAlignment(Gdiplus::StringAlignmentCenter);//垂直居中
Gdiplus::Font gFont(hdc, &lfont);
Gdiplus::Color clr1(255, 255, 255);
Gdiplus::SolidBrush br1(clr1);
Gdiplus::Graphics gdiGraphics(hdc);
wchar_t tempText[256] = { 0 };
int nLen = 0;
for (int i = 0; i < HVCR_CUSTOM_OSD_NUM; i++)
{
nLen = strlen(m_osdcfg.StOSDItems[i].szOSD_CHAR);
if (nLen == 0)
{
continue;
}
Gdiplus::RectF rec(50, 50 + 100 * i, 2000, 100);
memset(tempText, 0, 256);
char2wchar(tempText, m_osdcfg.StOSDItems[i].szOSD_CHAR);
gdiGraphics.DrawString(tempText, -1, &gdifont, rec, &strformat, &br1);
}
5.Image转Byte*
char* AddOSdInfo::Image2Byte(HGLOBAL mem, HBITMAP bmpTmpDraw)
{
Gdiplus::Bitmap bm2((HBITMAP)bmpTmpDraw, NULL);
CLSID Clsid2;
GetEncoderClsid(L"image/jpeg", &Clsid2);//GetEncoderClsid函数在文末
//bm2.Save(sNewPath2, &Clsid2);
IStream *stream = NULL;
HRESULT hr2 = CreateStreamOnHGlobal(mem, TRUE, &stream);
bm2.Save(stream, &Clsid2);
LARGE_INTEGER seekPos = {0};
ULARGE_INTEGER imageSize;
HRESULT hr = stream->Seek(seekPos, STREAM_SEEK_CUR, &imageSize);
if (m_pBody)
{
delete m_pBody;
m_pBody = NULL;
}
m_pBody = new BYTE[imageSize.LowPart];
hr = stream->Seek(seekPos, STREAM_SEEK_SET, 0);
hr = stream->Read(m_pBody, imageSize.LowPart, 0);
m_nFileSize = imageSize.LowPart;
//KOSA_fileWriteFile("SSSA.jpg", (UINT8*)m_pBody, imageSize.LowPart, false);
return (char*)m_pBody;
}
6.封装的类
//头文件
#ifndef ADDOSDINFO_H
#define ADDOSDINFO_H
#include "kosa_file.h"
#include "kosa_dir.h"
#include <comdef.h>
#include <GdiPlus.h>
#include "Define.h"
#define MAXPICBUF 6144000 // 最大图片缓冲区大小
class AddOSdInfo
{
public:
~AddOSdInfo();
static AddOSdInfo* GetInstance();
void SetOriginPicInfo(void *szBuf, DWORD dwBufSize, HVCR_OSD_CFG* osdcfg = NULL);
bool JPG2Image(void *szBuf, DWORD dwBufSize);
/*
GetOsdPicInfo 返回图片的buffer, nFileLen图片长度
*/
void* GetOsdPicInfo(Uint32* nFileLen);
char* Image2Byte(HGLOBAL mem, HBITMAP bmpTmpDraw);
void DrawImageEx(HDC hdc, Gdiplus::Image* pImage, RECT rc);
void DrawInfo(HDC hdc, void *oldObj, HBITMAP bmpTmpDraw, HDC hTempMemDC);
Uint32 GetFileLen();
void* GetBuffer();
void SetOsdInfo(HVCR_OSD_CFG *osdcfg);
private:
static AddOSdInfo* m_instance;
AddOSdInfo();
HGLOBAL m_hImageMemPic;
Gdiplus::Image* m_pImagePic;
SIZE m_sizePicOut;
Uint32 m_nFileSize;
void * m_pBody;
HVCR_OSD_CFG m_osdcfg;
};
#endif
//CPP文件
#include "AddOSdInfo.h"
#include "kosa_file.h"
#include "kosa_dir.h"
AddOSdInfo* AddOSdInfo::m_instance = NULL;
ULONG_PTR g_pGdiToken = NULL;
Gdiplus::GdiplusStartupInput g_gdiplusStartupInput;
int GetEncoderClsid(const WCHAR * format, CLSID * pClsid)
{
int nRet = -1;
Gdiplus::ImageCodecInfo * pCodecInfo = NULL;
UINT nNum = 0, nSize = 0;
Gdiplus::GetImageEncodersSize(&nNum, &nSize);
if (nSize < 0)
{
return nRet;
}
pCodecInfo = new Gdiplus::ImageCodecInfo[nSize];
if (pCodecInfo == NULL)
{
return nRet;
}
Gdiplus::GetImageEncoders(nNum, nSize, pCodecInfo);
for (UINT i = 0; i < nNum; i++)
{
if (wcscmp(pCodecInfo[i].MimeType, format) == 0)
{
*pClsid = pCodecInfo[i].Clsid;
nRet = i;
delete[] pCodecInfo;
return nRet;
}
else
{
continue;
}
}
delete[] pCodecInfo;
return nRet;
}
bool char2wchar(wchar_t* pwsz, const char* psz)
{
int len = MultiByteToWideChar(CP_ACP, 0, psz, -1, NULL, 0);
if (!pwsz)
{
return false;
}
memset(pwsz, 0, len + 1);
MultiByteToWideChar(CP_ACP, 0, psz, -1, pwsz, len);
return true;
}
AddOSdInfo::AddOSdInfo()
{
m_pImagePic = NULL;
Gdiplus::GdiplusStartup(&g_pGdiToken, &g_gdiplusStartupInput, NULL);
m_hImageMemPic = GlobalAlloc(GMEM_FIXED, MAXPICBUF);
m_pBody = NULL;
memset(&m_osdcfg, 0, sizeof(m_osdcfg));
}
AddOSdInfo *AddOSdInfo::GetInstance()
{
if (m_instance == NULL)
{
m_instance = new AddOSdInfo;
}
return m_instance;
}
AddOSdInfo::~AddOSdInfo()
{
if (m_hImageMemPic != NULL)
{
GlobalFree(m_hImageMemPic);
m_hImageMemPic = NULL;
}
if (g_pGdiToken)
{
Gdiplus::GdiplusShutdown(g_pGdiToken);
g_pGdiToken = 0;
}
}
void* AddOSdInfo::GetOsdPicInfo(Uint32 *pSize)
{
*pSize = m_nFileSize;
return m_pBody;
}
void AddOSdInfo::SetOriginPicInfo(void *szBuf, DWORD dwBufSize, HVCR_OSD_CFG* osdcfg)
{
if (osdcfg)
{
memcpy(&m_osdcfg, osdcfg, sizeof(HVCR_OSD_CFG));
}
JPG2Image(szBuf, dwBufSize);
HDC hdc = GetDC(NULL);
HDC hTempMemDC = ::CreateCompatibleDC(NULL);
HBITMAP bmpTmpDraw = ::CreateCompatibleBitmap(hdc, m_sizePicOut.cx, m_sizePicOut.cy);//hdc
if (bmpTmpDraw == NULL) bmpTmpDraw = ::CreateCompatibleBitmap(hdc, m_sizePicOut.cx, m_sizePicOut.cy);
if (bmpTmpDraw == NULL)
{
return;
}
HGDIOBJ oldObj = ::SelectObject(hTempMemDC, bmpTmpDraw);
RECT rc;
rc.left = 0;
rc.top = 0;
rc.right = m_sizePicOut.cx;
rc.bottom = m_sizePicOut.cy;
DrawImageEx(hTempMemDC, m_pImagePic, rc);
DrawInfo(hTempMemDC, oldObj, bmpTmpDraw, hTempMemDC);
Image2Byte(m_hImageMemPic, bmpTmpDraw);
if (bmpTmpDraw != NULL)
{
DeleteObject(bmpTmpDraw);
bmpTmpDraw = NULL;
}
if (hTempMemDC != NULL)
{
DeleteObject(hTempMemDC);
hTempMemDC = NULL;
}
}
// Jpg转换为Image;
bool AddOSdInfo::JPG2Image(void *szBuf, DWORD dwBufSize)
{
HGLOBAL hMem = m_hImageMemPic;
Gdiplus::Image** ppImage = &m_pImagePic;
m_sizePicOut.cx = 0;
m_sizePicOut.cy = 0;
int nMaxLen = MAXPICBUF;
BOOL bAlloc = FALSE;
if (hMem == NULL)
{
bAlloc = TRUE;
hMem = GlobalAlloc(GMEM_FIXED, nMaxLen);
}
if (*ppImage != NULL)
{
delete *ppImage;
*ppImage = NULL;
}
if (dwBufSize != 0)
{
IStream* pStmBmp = NULL;
CreateStreamOnHGlobal(hMem, FALSE, &pStmBmp);
BYTE* pbyBmp = (BYTE *)GlobalLock(hMem);
memset(pbyBmp, 0, nMaxLen);
memcpy(pbyBmp, szBuf, dwBufSize);
::GlobalUnlock(hMem);
*ppImage = Gdiplus::Image::FromStream(pStmBmp, FALSE);
if ((*ppImage) != NULL)
{
m_sizePicOut.cx = (*ppImage)->GetWidth();
m_sizePicOut.cy = (*ppImage)->GetHeight();
}
}
if (bAlloc)
{
GlobalFree(hMem);
}
/*CLSID pngClsid;
GetEncoderClsid(L"image/jpeg", &pngClsid);
m_pImagePic->Save(L"Mosaic245.jpg", &pngClsid, NULL);*/
return ((*ppImage) != NULL);
}
void* AddOSdInfo::GetBuffer()
{
return m_pBody;
}
Uint32 AddOSdInfo::GetFileLen()
{
return m_nFileSize;
}
void AddOSdInfo::SetOsdInfo(HVCR_OSD_CFG *osdcfg)
{
memcpy(&m_osdcfg, osdcfg, sizeof(HVCR_OSD_CFG));
}
void AddOSdInfo::DrawInfo(HDC hdc, void *oldObj, HBITMAP bmpTmpDraw, HDC hTempMemDC)
{
#if 0
HFONT hFont = (HFONT)GetStockObject(DEFAULT_GUI_FONT);//CDC::GetCurrentFont(hdc);
LOGFONT LogFont = { 0 };
::GetObject(hFont, sizeof(LOGFONT), &LogFont);
::DeleteObject(hFont);
LogFont.lfHeight = -80; // 字体大小
hFont = CreateFontIndirect(&LogFont);
HFONT hOldFont = (HFONT)::SelectObject(hdc, hFont);
COLORREF clr = 0xFFFFFF;
COLORREF clrOld = ::GetTextColor(hdc);
SetBkMode(hdc, TRANSPARENT);
::SetTextColor(hdc, clr);
int nLen = 0;
for (int i = 0; i < HVCR_CUSTOM_OSD_NUM; i++)
{
nLen = strlen(m_osdcfg.StOSDItems[i].szOSD_CHAR);
if (nLen == 0)
{
continue;
}
::TextOut(hdc, 80, 100 * (i + 1), m_osdcfg.StOSDItems[i].szOSD_CHAR, nLen);
}
::SetTextColor(hdc, clrOld);
//char szTxt[168] = { 0 };
//sprintf(szTxt, "ddddd大家好的萨芬硒鼓硒鼓", strlen("ddddd大家好的萨芬硒鼓硒鼓"));
//::TextOut(hdc, 100, 100, szTxt, strlen(szTxt));
//
#else
//create font
LOGFONTW lfont;
memset(&lfont, 0, sizeof(lfont));
int emSize = 70;
lfont.lfHeight = -emSize; // nHeight 注意使用负值,表示character height, 正值表示 cell height
lfont.lfWeight = 400;//100;//FW_NORMAL, //nWeight
lfont.lfCharSet = GB2312_CHARSET;//;//ANSI_CHARSET
wcscpy(lfont.lfFaceName, (L"微软雅黑")); // lpszFacename
Gdiplus::Font gdifont(hdc, &lfont);
Gdiplus::StringFormat strformat;
strformat.SetAlignment(Gdiplus::StringAlignmentNear);//水平居左
strformat.SetLineAlignment(Gdiplus::StringAlignmentCenter);//垂直居中
Gdiplus::Font gFont(hdc, &lfont);
Gdiplus::Color clr1(255, 255, 255);
Gdiplus::SolidBrush br1(clr1);
Gdiplus::Graphics gdiGraphics(hdc);
wchar_t tempText[256] = { 0 };
int nLen = 0;
for (int i = 0; i < HVCR_CUSTOM_OSD_NUM; i++)
{
nLen = strlen(m_osdcfg.StOSDItems[i].szOSD_CHAR);
if (nLen == 0)
{
continue;
}
Gdiplus::RectF rec(50, 50 + 100 * i, 2000, 100);
memset(tempText, 0, 256);
char2wchar(tempText, m_osdcfg.StOSDItems[i].szOSD_CHAR);
gdiGraphics.DrawString(tempText, -1, &gdifont, rec, &strformat, &br1);
}
#endif
/*
wchar_t *sNewPath2 = L"..\\DevInterfaces\\HVCR_KD_V7_1\\tempDir\\temp.jpg";
Gdiplus::Bitmap bm2((HBITMAP)bmpTmpDraw, NULL);
CLSID Clsid2;
GetEncoderClsid(L"image/jpeg", &Clsid2);//GetEncoderClsid函数在文末
//bm2.Save(sNewPath2, &Clsid2);
IStream *stream = NULL;
HRESULT hr2 = CreateStreamOnHGlobal(m_hImageMemPic, TRUE, &stream);
bm2.Save(stream, &Clsid2);
LARGE_INTEGER seekPos = {0};
ULARGE_INTEGER imageSize;
HRESULT hr = stream->Seek(seekPos, STREAM_SEEK_CUR, &imageSize);
if (m_pBody)
{
delete m_pBody;
m_pBody = NULL;
}
m_pBody = new BYTE[imageSize.LowPart];
hr = stream->Seek(seekPos, STREAM_SEEK_SET, 0);
hr = stream->Read(m_pBody, imageSize.LowPart, 0);
m_nFileSize = imageSize.LowPart;
KOSA_fileWriteFile("SSSA.jpg", (UINT8*)m_pBody, imageSize.LowPart, false);
*/
SelectObject(hTempMemDC, oldObj);
}
char* AddOSdInfo::Image2Byte(HGLOBAL mem, HBITMAP bmpTmpDraw)
{
Gdiplus::Bitmap bm2((HBITMAP)bmpTmpDraw, NULL);
CLSID Clsid2;
GetEncoderClsid(L"image/jpeg", &Clsid2);//GetEncoderClsid函数在文末
//bm2.Save(sNewPath2, &Clsid2);
IStream *stream = NULL;
HRESULT hr2 = CreateStreamOnHGlobal(mem, TRUE, &stream);
bm2.Save(stream, &Clsid2);
LARGE_INTEGER seekPos = {0};
ULARGE_INTEGER imageSize;
HRESULT hr = stream->Seek(seekPos, STREAM_SEEK_CUR, &imageSize);
if (m_pBody)
{
delete m_pBody;
m_pBody = NULL;
}
m_pBody = new BYTE[imageSize.LowPart];
hr = stream->Seek(seekPos, STREAM_SEEK_SET, 0);
hr = stream->Read(m_pBody, imageSize.LowPart, 0);
m_nFileSize = imageSize.LowPart;
//KOSA_fileWriteFile("SSSA.jpg", (UINT8*)m_pBody, imageSize.LowPart, false);
return (char*)m_pBody;
}
void AddOSdInfo::DrawImageEx(HDC hdc, Gdiplus::Image* pImage, RECT rc)
{
if (pImage)
{
Gdiplus::Graphics g(hdc);
Gdiplus::ImageAttributes ImgAtt;
ImgAtt.SetWrapMode(Gdiplus::WrapModeTileFlipXY);
g.DrawImage(pImage, Gdiplus::Rect(rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top),
0, 0, pImage->GetWidth(), pImage->GetHeight(),
Gdiplus::UnitPixel, &ImgAtt, NULL, NULL);
}
else
{
//绘制背景
HBRUSH hbrush = CreateSolidBrush(GetBkColor(hdc));
::FillRect(hdc, &rc, hbrush);
::DeleteObject(hbrush);
}
}
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文章浏览阅读2.3k次。一、常规线性回归及其求解方法核心提炼1、普通最小二乘法(OLS)的解析解可以用 Gaussian 分布以及极大似然估计解释;2、Ridge 回归可以用 Gaussian 分布和最大后验估计解释 ;3、LASSO 回归可以用 Laplace 分布和最大后验估计解释。二、贝叶斯线性回归定义贝叶斯线性回归(Bayesian linear r..._贝叶斯回归分析和偏最小二乘回归分析
文章浏览阅读1.4k次,点赞5次,收藏15次。树的定义:只有一个根节点,但是分支可以没有规律,也就是说不像二叉树那样每个结点最多生出两个分支。而且树和接下去学习的图都有一个共同的特点就是套娃,无限套娃。树的存储结构方式都会用到数组顺序存储结构,数组是核心,数组结合链式的也有。至于为什么树要用到数组比较多,我认为是数组有一个很好的点就是他的位置可以很容易且快速的找到并访问,但是链式就不具有该优点,因为链式是一条绳子上的蚂蚱,必须一个一个的找。很显然就像名字说的那样,用该结点的双亲结点位置来表示当前的结点。双亲表示法就比如:让孩子记住自己父母的电话一_c语言输入并存储一个森林
文章浏览阅读1w次,点赞6次,收藏51次。区分 &,丨,^的运算规则 & (按位与运算符)表示:两个操作数中位都为1,结果为1如果两个操作中位一个1另一个0 ,结果为0即运算规则:0&0=0; 0&1=0; 1&0=0; 1&1=1;例如:1010 & 1110= 1010|(按位或运算符)表示:两个操作中位只有一个为1,结果就等与1即运算规则:0|0=0; ..._代码对&0xff