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解决scannerlib保存图像时dpi不正常的问题

This commit is contained in:
luoliangyi 2023-01-31 15:54:54 +08:00
parent c2ab5c4416
commit a75620c6a4
3 changed files with 29 additions and 10 deletions
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12
sdk/scannerlib/HGLibDeviceImpl.cpp
View File

@ -220,6 +220,7 @@ HGLibDeviceImpl::HGLibDeviceImpl()
HGBase_CreateLock(&m_lock);
m_devHandle = NULL;
m_devName.clear();
m_dpi = 96;
m_scanning = HGFALSE;
m_scanEvent = NULL;
m_eventFunc = NULL;
@ -975,6 +976,13 @@ HGBool HGLibDeviceImpl::StartScan(HGLibDeviceScanEventFunc eventFunc, HGPointer
HGBase_EnterLock(m_lock);
if (!m_scanning)
{
HGLibDeviceParam* devParam = GetParam(HGLIB_OPTION_NAME_FBL);
if (NULL != devParam && devParam->type == HGLIB_OPTION_VALUETYPE_INT)
{
m_dpi = devParam->intValue;
ReleaseParam(devParam);
}
HGBase_CreateEvent(HGFALSE, HGFALSE, &m_scanEvent);
assert(NULL != m_scanEvent);
m_eventFunc = eventFunc;
@ -993,6 +1001,7 @@ HGBool HGLibDeviceImpl::StartScan(HGLibDeviceScanEventFunc eventFunc, HGPointer
m_imageParam = NULL;
HGBase_DestroyEvent(m_scanEvent);
m_scanEvent = NULL;
m_dpi = 96;
}
else
{
@ -1020,6 +1029,7 @@ HGBool HGLibDeviceImpl::StopScan()
m_imageFunc = NULL;
m_imageParam = NULL;
m_scanning = HGFALSE;
m_dpi = 96;
ret = HGTRUE;
}
HGBase_LeaveLock(m_lock);
@ -1177,6 +1187,7 @@ int HGLibDeviceImpl::sane_ex_callback(SANE_Handle hdev, int code, void* data, un
deviceImpl->m_imageFunc = NULL;
deviceImpl->m_imageParam = NULL;
deviceImpl->m_scanning = HGFALSE;
deviceImpl->m_dpi = 96;
HGBase_LeaveLock(deviceImpl->m_lock);
if (NULL != eventFunc)
@ -1224,6 +1235,7 @@ int HGLibDeviceImpl::sane_ex_callback(SANE_Handle hdev, int code, void* data, un
HGBase_CreateImageFromData(data, &imgInfo, NULL, 0, HGBASE_IMGORIGIN_TOP, &img);
if (NULL != img)
{
HGBase_SetImageDpi(img, deviceImpl->m_dpi, deviceImpl->m_dpi);
deviceImpl->m_imageFunc((HGLibDevice)deviceImpl, (HGLibImage)img, deviceImpl->m_imageParam);
HGBase_DestroyImage(img);
}

1
sdk/scannerlib/HGLibDeviceImpl.hpp
View File

@ -57,6 +57,7 @@ private:
HGLock m_lock;
SANE_Handle m_devHandle;
std::string m_devName;
HGInt m_dpi;
HGBool m_scanning;
HGEvent m_scanEvent;
HGLibDeviceScanEventFunc m_eventFunc;

26
test/scannerlib/huagao/c#/WindowsFormsApp1/Form1.cs
View File

@ -156,7 +156,13 @@ namespace WindowsFormsApp1
gamma[0] = 1.0;
Int32 ret3 = HGScannerLib.HGLib_SetDeviceParam(device, 35,
Marshal.UnsafeAddrOfPinnedArrayElement(gamma, 0));
// 设置DPI
UInt32[] dpi = new UInt32[1];
dpi[0] = 133;
Int32 ret4 = HGScannerLib.HGLib_SetDeviceParam(device, 27,
Marshal.UnsafeAddrOfPinnedArrayElement(dpi, 0));
// 获取旋转的配置
IntPtr rotateParam = HGScannerLib.HGLib_GetDeviceParam(device, 59);
if (IntPtr.Zero != rotateParam)
@ -246,16 +252,16 @@ namespace WindowsFormsApp1
String fileName = String.Format("Scan_{0}.jpg", m_scanCount);
++m_scanCount;
Bitmap curBitmap = createBitmap(image);
curBitmap.Save(fileName);
//Bitmap curBitmap = createBitmap(image);
//curBitmap.Save(fileName);
//HGScannerLib.HGLibSaveImageParam saveParam;
//saveParam.size = (UInt32)Marshal.SizeOf(typeof(HGScannerLib.HGLibSaveImageParam));
//saveParam.jpegQuality = 80;
//saveParam.tiffCompression = 4;
//saveParam.tiffJpegQuality = 80;
//saveParam.ocr = 0;
//HGScannerLib.HGLib_SaveImage(image, StringToUtf8(fileName), ref saveParam);
HGScannerLib.HGLibSaveImageParam saveParam;
saveParam.size = (UInt32)Marshal.SizeOf(typeof(HGScannerLib.HGLibSaveImageParam));
saveParam.jpegQuality = 80;
saveParam.tiffCompression = 4;
saveParam.tiffJpegQuality = 80;
saveParam.ocr = 0;
HGScannerLib.HGLib_SaveImage(image, StringToUtf8(fileName), ref saveParam);
}
public String Utf8ToString(IntPtr str)