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/********************************************************************
filename: CImgLoader.cpp
created: 2011-01-05
author: firehood
purpose: 文件加载类,将外部图片资源转化成绘制纹理时所需的位图数据
图片格式支持bmp、png、jpg.
*********************************************************************/
#include "StdAfx.h"
#include "ImgLoader.h"
// IImage Includer
#include <imaging.h>
#include <initguid.h>
#include <imgguids.h>
// IImage lib
#pragma comment(lib, "Imaging.lib")
CImgLoader::CImgLoader(void)
{
m_pImage = NULL;
m_Width = 0;
m_Height = 0;
}
CImgLoader::~CImgLoader(void)
{
}
// 加载图片资源
BOOL CImgLoader::Load(LPCTSTR lpFileName)
{
IImagingFactory *pImgFactory = NULL;
IImage *pImage = NULL;
IBitmapImage *pBmpImg = NULL;
//
CoInitializeEx(NULL, COINIT_MULTITHREADED);
if (!SUCCEEDED(CoCreateInstance(CLSID_ImagingFactory, NULL, CLSCTX_INPROC_SERVER, IID_IImagingFactory, (void **) &pImgFactory)))
return FALSE;
if (!SUCCEEDED(pImgFactory->CreateImageFromFile(lpFileName, &pImage)))
return FALSE;
// 获取图像大小信息
ImageInfo ImgInfo;
pImage->GetImageInfo(&ImgInfo);
m_Width = ImgInfo.Width;
m_Height = ImgInfo.Height;
if (FAILED(pImgFactory->CreateBitmapFromImage(
pImage,m_Width,m_Height,PixelFormat24bppRGB,
InterpolationHintDefault,&pBmpImg)))
{
return FALSE;
}
RECT rect = {0,0,m_Width,m_Height};
BitmapData *BmpData = new BitmapData;
if (FAILED(pBmpImg->LockBits(&rect,
ImageLockModeRead|ImageLockModeWrite,
PixelFormat24bppRGB,BmpData)))
{
return FALSE;
}
int line = BmpData->Stride;
LPBYTE lpData, lpLine, lpCurPixel;
lpData = lpLine = (LPBYTE)BmpData->Scan0; // 获取BMP位图实际值的地址指针
// 若为Bottom-Up(从下到上)的位图,则指向buffer的结尾
// 若为Top-Down(从上到下)的位图,则指向buffer的开头
// int nBytesPP = nBPP >> 3; // 左移三位即除以8,获取图像每像素字节数
m_pImage = new unsigned char[m_Width * m_Height * 3];
memset(m_pImage, 0, m_Width * m_Height * 3);
if(m_pImage == NULL)
return FALSE;
if (line>0)
{
int pos = m_Width * m_Height * 3-1;
for(int i = 0; i<m_Height; i++) // 行
{
lpLine = lpData + i * line; // 获取图像每一行地址指针
for(int j = m_Width-1; j>-1; j--) // 列
{
lpCurPixel = lpLine + j * 3; // 获取每行每像素地址指针
m_pImage[pos--] = *lpCurPixel ; // R
m_pImage[pos--] = *(lpCurPixel + 1); // G
m_pImage[pos--] = *(lpCurPixel + 2); // B
}
}
}
else
{
int pos = 0 ;
for(int i = m_Height-1; i>-1; i--) // 行
{
lpLine = lpData + i * line; // 获取图像每一行地址指针
for(int j = 0; j<m_Width; j++) // 列
{
lpCurPixel = lpLine + j * 3; // 获取每行每像素地址指针
m_pImage[pos++] = *(lpCurPixel + 2); // R
m_pImage[pos++] = *(lpCurPixel + 1); // G
m_pImage[pos++] = *lpCurPixel; // B
}
}
}
if (FAILED(pBmpImg->UnlockBits(BmpData)))
{
return FALSE;
}
delete BmpData;
pBmpImg = NULL;
pImage->Release();
pImgFactory->Release();
return TRUE;
}
// 获取图片数据
unsigned char* CImgLoader::GetBmpImage(void)
{
return m_pImage;
}
// 获取图像宽度
int CImgLoader::Width()
{
return m_Width;
}
// 获取图像高度
int CImgLoader::Height()
{
return m_Height;
}
// 释放图片资源
void CImgLoader::Free()
{
if(m_pImage)
{
delete []m_pImage;
m_pImage = NULL;
}
}
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