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146 lines
4.0 KiB
146 lines
4.0 KiB
// ==========================================================
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// Load From Handle Example
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//
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// Design and implementation by
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// - Hervé Drolon
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//
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// This file is part of FreeImage 3
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//
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// COVERED CODE IS PROVIDED UNDER THIS LICENSE ON AN "AS IS" BASIS, WITHOUT WARRANTY
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// OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, WITHOUT LIMITATION, WARRANTIES
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// THAT THE COVERED CODE IS FREE OF DEFECTS, MERCHANTABLE, FIT FOR A PARTICULAR PURPOSE
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// OR NON-INFRINGING. THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE COVERED
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// CODE IS WITH YOU. SHOULD ANY COVERED CODE PROVE DEFECTIVE IN ANY RESPECT, YOU (NOT
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// THE INITIAL DEVELOPER OR ANY OTHER CONTRIBUTOR) ASSUME THE COST OF ANY NECESSARY
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// SERVICING, REPAIR OR CORRECTION. THIS DISCLAIMER OF WARRANTY CONSTITUTES AN ESSENTIAL
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// PART OF THIS LICENSE. NO USE OF ANY COVERED CODE IS AUTHORIZED HEREUNDER EXCEPT UNDER
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// THIS DISCLAIMER.
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//
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// Use at own risk!
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// ==========================================================
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// This example shows how to load a bitmap from a
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// user allocated FILE pointer.
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//
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// Functions used in this sample :
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// FreeImage_GetFormatFromFIF, FreeImage_GetFileTypeFromHandle, FreeImage_LoadFromHandle,
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// FreeImage_GetFIFFromFilename, FreeImage_Save, FreeImage_Unload
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// FreeImage_GetVersion, FreeImage_GetCopyrightMessage, FreeImage_SetOutputMessage
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//
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// ==========================================================
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#include <assert.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include "FreeImage.h"
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// ----------------------------------------------------------
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/**
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FreeImage error handler
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@param fif Format / Plugin responsible for the error
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@param message Error message
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*/
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void FreeImageErrorHandler(FREE_IMAGE_FORMAT fif, const char *message) {
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printf("\n*** ");
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if(fif != FIF_UNKNOWN) {
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printf("%s Format\n", FreeImage_GetFormatFromFIF(fif));
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}
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printf(message);
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printf(" ***\n");
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}
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// ----------------------------------------------------------
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unsigned DLL_CALLCONV
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myReadProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
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return fread(buffer, size, count, (FILE *)handle);
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}
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unsigned DLL_CALLCONV
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myWriteProc(void *buffer, unsigned size, unsigned count, fi_handle handle) {
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return fwrite(buffer, size, count, (FILE *)handle);
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}
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int DLL_CALLCONV
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mySeekProc(fi_handle handle, long offset, int origin) {
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return fseek((FILE *)handle, offset, origin);
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}
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long DLL_CALLCONV
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myTellProc(fi_handle handle) {
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return ftell((FILE *)handle);
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}
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// ----------------------------------------------------------
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int
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main(int argc, char *argv[]) {
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// call this ONLY when linking with FreeImage as a static library
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#ifdef FREEIMAGE_LIB
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FreeImage_Initialise();
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#endif // FREEIMAGE_LIB
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// initialize your own FreeImage error handler
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FreeImage_SetOutputMessage(FreeImageErrorHandler);
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// print version & copyright infos
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printf(FreeImage_GetVersion());
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printf("\n");
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printf(FreeImage_GetCopyrightMessage());
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printf("\n");
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if(argc != 2) {
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printf("Usage : LoadFromHandle <input file name>\n");
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return 0;
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}
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// initialize your own IO functions
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FreeImageIO io;
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io.read_proc = myReadProc;
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io.write_proc = myWriteProc;
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io.seek_proc = mySeekProc;
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io.tell_proc = myTellProc;
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FILE *file = fopen(argv[1], "rb");
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if (file != NULL) {
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// find the buffer format
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FREE_IMAGE_FORMAT fif = FreeImage_GetFileTypeFromHandle(&io, (fi_handle)file, 0);
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if(fif != FIF_UNKNOWN) {
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// load from the file handle
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FIBITMAP *dib = FreeImage_LoadFromHandle(fif, &io, (fi_handle)file, 0);
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// save the bitmap as a PNG ...
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const char *output_filename = "test.png";
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// first, check the output format from the file name or file extension
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FREE_IMAGE_FORMAT out_fif = FreeImage_GetFIFFromFilename(output_filename);
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if(out_fif != FIF_UNKNOWN) {
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// then save the file
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FreeImage_Save(out_fif, dib, output_filename, 0);
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}
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// free the loaded FIBITMAP
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FreeImage_Unload(dib);
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}
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fclose(file);
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}
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// call this ONLY when linking with FreeImage as a static library
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#ifdef FREEIMAGE_LIB
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FreeImage_DeInitialise();
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#endif // FREEIMAGE_LIB
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return 0;
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}
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