FreeImage 画到句柄上, gcc 的 windows 版本是可以直接使用 freeimage 的 vc 格式 lib 的.[也许仅仅是针对 vc6 的 dll 版本 lib ? 有待确定]
在 cb 的 link 中加上 FreeImage 就行了,注意不要 FreeImage.lib 这样含后缀名的.
/***************************************************************
* Name: free_imgMain.cpp
* Purpose: Code for Application Frame
* Author: ()
* Created: 2012-02-03
* Copyright: ()
* License:
**************************************************************/
#include "free_imgMain.h"
#include <wx/msgdlg.h>
#include "windows.h"
#include "FreeImage.h"
//(*InternalHeaders(free_imgDialog)
#include <wx/intl.h>
#include <wx/string.h>
//*)
//helper functions
enum wxbuildinfoformat {
short_f, long_f };
wxString wxbuildinfo(wxbuildinfoformat format)
{
wxString wxbuild(wxVERSION_STRING);
if (format == long_f )
{
#if defined(__WXMSW__)
wxbuild << _T("-Windows");
#elif defined(__UNIX__)
wxbuild << _T("-Linux");
#endif
#if wxUSE_UNICODE
wxbuild << _T("-Unicode build");
#else
wxbuild << _T("-ANSI build");
#endif // wxUSE_UNICODE
}
return wxbuild;
}
//(*IdInit(free_imgDialog)
const long free_imgDialog::ID_BUTTON1 = wxNewId();
const long free_imgDialog::ID_BUTTON2 = wxNewId();
//*)
BEGIN_EVENT_TABLE(free_imgDialog,wxDialog)
//(*EventTable(free_imgDialog)
//*)
END_EVENT_TABLE()
free_imgDialog::free_imgDialog(wxWindow* parent,wxWindowID id)
{
//(*Initialize(free_imgDialog)
Create(parent, id, _("wxWidgets app"), wxDefaultPosition, wxDefaultSize, wxDEFAULT_DIALOG_STYLE|wxRESIZE_BORDER|wxMAXIMIZE_BOX|wxMINIMIZE_BOX, _T("id"));
Button1 = new wxButton(this, ID_BUTTON1, _("Label"), wxPoint(64,40), wxDefaultSize, 0, wxDefaultValidator, _T("ID_BUTTON1"));
Button2 = new wxButton(this, ID_BUTTON2, _("Label"), wxPoint(88,152), wxDefaultSize, 0, wxDefaultValidator, _T("ID_BUTTON2"));
Center();
Connect(ID_BUTTON1,wxEVT_COMMAND_BUTTON_CLICKED,(wxObjectEventFunction)&free_imgDialog::OnButton1Click);
//*)
}
free_imgDialog::~free_imgDialog()
{
//(*Destroy(free_imgDialog)
//*)
}
void free_imgDialog::OnQuit(wxCommandEvent& event)
{
Close();
}
void free_imgDialog::OnAbout(wxCommandEvent& event)
{
wxString msg = wxbuildinfo(long_f);
wxMessageBox(msg, _("Welcome to..."));
}
// ----------------------------------------------------------
/**
FreeImage error handler
@param fif Format / Plugin responsible for the error
@param message Error message
*/
void FreeImageErrorHandler(FREE_IMAGE_FORMAT fif, const char *message) {
printf("\n*** ");
if(fif != FIF_UNKNOWN) {
printf("%s Format\n", FreeImage_GetFormatFromFIF(fif));
}
printf(message);
printf(" ***\n");
}
// ----------------------------------------------------------
unsigned DLL_CALLCONV
myReadProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
return fread(buffer, size, count, (FILE *)handle);
}
unsigned DLL_CALLCONV
myWriteProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
return fwrite(buffer, size, count, (FILE *)handle);
}
int DLL_CALLCONV
mySeekProc(fi_handle handle, long offset, int origin) {
return fseek((FILE *)handle, offset, origin);
}
long DLL_CALLCONV
myTellProc(fi_handle handle) {
return ftell((FILE *)handle);
}
// ----------------------------------------------------------
//来自 freeimage 的例子
int main2(int argc, char *argv[]) {
// call this ONLY when linking with FreeImage as a static library
#ifdef FREEIMAGE_LIB
FreeImage_Initialise();
#endif // FREEIMAGE_LIB
// initialize your own FreeImage error handler
FreeImage_SetOutputMessage(FreeImageErrorHandler);
// print version & copyright infos
printf(FreeImage_GetVersion());
printf("\n");
printf(FreeImage_GetCopyrightMessage());
printf("\n");
if(argc != 2) {
printf("Usage : LoadFromHandle <input file name>\n");
return 0;
}
// initialize your own IO functions
FreeImageIO io;
io.read_proc = myReadProc;
io.write_proc = myWriteProc;
io.seek_proc = mySeekProc;
io.tell_proc = myTellProc;
FILE *file = fopen(argv[1], "rb");
if (file != NULL) {
// find the buffer format
FREE_IMAGE_FORMAT fif = FreeImage_GetFileTypeFromHandle(&io, (fi_handle)file, 0);
if(fif != FIF_UNKNOWN) {
// load from the file handle
FIBITMAP *dib = FreeImage_LoadFromHandle(fif, &io, (fi_handle)file, 0);
// save the bitmap as a PNG ...
const char *output_filename = "test.png";
// first, check the output format from the file name or file extension
FREE_IMAGE_FORMAT out_fif = FreeImage_GetFIFFromFilename(output_filename);
if(out_fif != FIF_UNKNOWN) {
// then save the file
FreeImage_Save(out_fif, dib, output_filename, 0);
}
// free the loaded FIBITMAP
FreeImage_Unload(dib);
}
fclose(file);
}
// call this ONLY when linking with FreeImage as a static library
#ifdef FREEIMAGE_LIB
FreeImage_DeInitialise();
#endif // FREEIMAGE_LIB
return 0;
}
//--------------------------------------------------
void Draw2(HDC hdc, FIBITMAP *pFI)
{
//FIBITMAP *pFI;// = ;//pDoc->m_pFI;
if(pFI){
BYTE* pBits = FreeImage_GetBits(pFI);
BITMAPINFO* pIf=FreeImage_GetInfo(pFI);
int W = FreeImage_GetWidth(pFI);
int H = FreeImage_GetHeight(pFI);
//CRect rectClient;GetClientRect(rectClient);
//int dstW = rectClient.Width();
//int dstH = rectClient.Height();
::SetStretchBltMode(hdc,COLORONCOLOR);
::SetDIBitsToDevice(hdc,0,0, W, H,0,0,0, H,pBits,pIf,DIB_RGB_COLORS);
}
}//
// ----------------------------------------------------------
int draw(HDC hdc, char * fn) {
// call this ONLY when linking with FreeImage as a static library
#ifdef FREEIMAGE_LIB
FreeImage_Initialise();
#endif // FREEIMAGE_LIB
// initialize your own FreeImage error handler
FreeImage_SetOutputMessage(FreeImageErrorHandler);
// print version & copyright infos
printf(FreeImage_GetVersion());
printf("\n");
printf(FreeImage_GetCopyrightMessage());
printf("\n");
// initialize your own IO functions
FreeImageIO io;
io.read_proc = myReadProc;
io.write_proc = myWriteProc;
io.seek_proc = mySeekProc;
io.tell_proc = myTellProc;
FILE *file = fopen(fn, "rb");
if (file != NULL) {
// find the buffer format
FREE_IMAGE_FORMAT fif = FreeImage_GetFileTypeFromHandle(&io, (fi_handle)file, 0);
if(fif != FIF_UNKNOWN) {
// load from the file handle
FIBITMAP *dib = FreeImage_LoadFromHandle(fif, &io, (fi_handle)file, 0);
Draw2(hdc, dib);
// save the bitmap as a PNG ...
const char *output_filename = "test.png";
// first, check the output format from the file name or file extension
FREE_IMAGE_FORMAT out_fif = FreeImage_GetFIFFromFilename(output_filename);
if(out_fif != FIF_UNKNOWN) {
// then save the file
FreeImage_Save(out_fif, dib, output_filename, 0);
}
// free the loaded FIBITMAP
FreeImage_Unload(dib);
}
fclose(file);
}
// call this ONLY when linking with FreeImage as a static library
#ifdef FREEIMAGE_LIB
FreeImage_DeInitialise();
#endif // FREEIMAGE_LIB
return 0;
}
void free_imgDialog::OnButton1Click(wxCommandEvent& event)
{
char *argv[] = {"", "c://2.jpg"};
main2(2, argv);
//FreeImage_
HDC hdc = ::GetDC((HWND)this->GetHWND());
draw(hdc, "c://1.txt");
}
--------------------------------------------------
几个问题:
1.其实有 FreeImage_Load() 函数直接加载,不用写那么多回调.
2.怎么画透明的 png 呢,也许要参考 cximage .
3.因为用了 libpng 等是不是比 cximage 快呢? cximage 的缩放是比较慢的,远慢于微软xp自带的那个图片浏览器.
