/** @file JCJpegImg.cpp @brief @author hugao @version 1.0 @date 2016_5_11 */ #include #include #include #include "JCImageRW.h" #include "../util/JCCommonMethod.h" #pragma warning (disable: 4996) //------------------------------------------------------------------------------ /* * Include file for users of JPEG library. * You will need to have included system headers that define at least * the typedefs FILE and size_t before you can include jpeglib.h. * (stdio.h is sufficient on ANSI-conforming systems.) * You may also wish to include "jerror.h". */ #include "jpeglib.h" /* * is used for the optional error recovery mechanism shown in * the second part of the example. */ #include namespace laya { /******************** JPEG COMPRESSION SAMPLE INTERFACE *******************/ /* This half of the example shows how to feed data into the JPEG compressor. * We present a minimal version that does not worry about refinements such * as error recovery (the JPEG code will just exit() if it gets an error). */ /* * ERROR HANDLING: * * The JPEG library's standard error handler (jerror.c) is divided into * several "methods" which you can override individually. This lets you * adjust the behavior without duplicating a lot of code, which you might * have to update with each future release. * * Our example here shows how to override the "error_exit" method so that * control is returned to the library's caller when a fatal error occurs, * rather than calling exit() as the standard error_exit method does. * * We use C's setjmp/longjmp facility to return control. This means that the * routine which calls the JPEG library must first execute a setjmp() call to * establish the return point. We want the replacement error_exit to do a * longjmp(). But we need to make the setjmp buffer accessible to the * error_exit routine. To do this, we make a private extension of the * standard JPEG error handler object. (If we were using C++, we'd say we * were making a subclass of the regular error handler.) * * Here's the extended error handler struct: */ struct my_error_mgr { struct jpeg_error_mgr pub; /* "public" fields */ jmp_buf setjmp_buffer; /* for return to caller */ }; typedef struct my_error_mgr * my_error_ptr; /* * Here's the routine that will replace the standard error_exit method: */ METHODDEF(void) my_error_exit (j_common_ptr cinfo) { /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */ my_error_ptr myerr = (my_error_ptr) cinfo->err; /* Always display the message. */ /* We could postpone this until after returning, if we chose. */ (*cinfo->err->output_message) (cinfo); /* Return control to the setjmp point */ longjmp(myerr->setjmp_buffer, 1); } /* * Sample routine for JPEG decompression. We assume that the source file name * is passed in. We want to return 1 on success, 0 on error. */ unsigned char* readFile(const char* filename,int &size) { unsigned char *infile; FILE* fInput; if ((fInput = fopen(filename, "rb")) == NULL) { fprintf(stderr, "can't open %s\n", filename); return 0; } fseek(fInput,0L,SEEK_END); size=ftell(fInput); fseek(fInput,0L,SEEK_SET); infile = (unsigned char*)malloc(size); if (!infile) { throw - 3; } else { size = fread(infile, 1, size, fInput); } fclose(fInput); return infile; } GLOBAL(int) LoadJpegFromMem (BitmapData * texture,unsigned char * infile,int size ) { /* This struct contains the JPEG decompression parameters and pointers to * working space (which is allocated as needed by the JPEG library). */ struct jpeg_decompress_struct cinfo; /* We use our private extension JPEG error handler. * Note that this struct must live as long as the main JPEG parameter * struct, to avoid dangling-pointer problems. */ struct my_error_mgr jerr; /* More stuff */ JSAMPARRAY buffer; /* Output row buffer */ int row_stride; /* physical row width in output buffer */ /* In this example we want to open the input file before doing anything else, * so that the setjmp() error recovery below can assume the file is open. * VERY IMPORTANT: use "b" option to fopen() if you are on a machine that * requires it in order to read binary files. */ /* Step 1: allocate and initialize JPEG decompression object */ /* We set up the normal JPEG error routines, then override error_exit. */ cinfo.err = jpeg_std_error(&jerr.pub); jerr.pub.error_exit = my_error_exit; /* Establish the setjmp return context for my_error_exit to use. */ if (setjmp(jerr.setjmp_buffer)) { /* If we get here, the JPEG code has signaled an error. * We need to clean up the JPEG object, close the input file, and return. */ jpeg_destroy_decompress(&cinfo); //fclose(infile); return 0; } /* Now we can initialize the JPEG decompression object. */ jpeg_create_decompress(&cinfo); /* Step 2: specify data source (eg, a file) */ //jpeg_stdio_src(&cinfo, infile); jpeg_mem_src(&cinfo, infile,size); /* Step 3: read file parameters with jpeg_read_header() */ (void) jpeg_read_header(&cinfo, TRUE); /* We can ignore the return value from jpeg_read_header since * (a) suspension is not possible with the stdio data source, and * (b) we passed TRUE to reject a tables-only JPEG file as an error. * See libjpeg.txt for more info. */ /* Step 4: set parameters for decompression */ /* In this example, we don't need to change any of the defaults set by * jpeg_read_header(), so we do nothing here. */ if (cinfo.jpeg_color_space == JCS_GRAYSCALE) { } else { cinfo.out_color_space = JCS_RGB; } /* Step 5: Start decompressor */ (void) jpeg_start_decompress(&cinfo); /* We can ignore the return value since suspension is not possible * with the stdio data source. */ texture->m_nWidth = cinfo.image_width; texture->m_nHeight = cinfo.output_height; texture->m_nBpp = 32;//cinfo.output_components * 8; /*if(cinfo.output_components!=3) { (void)jpeg_finish_decompress(&cinfo); jpeg_destroy_decompress(&cinfo); return false; }*/ #if 0 if(cinfo.output_components == 3) { texture->type = GL_RGB; } else // Else if its 32 BPP { texture->type = GL_RGBA; } texture->imageData = std::shared_ptr (new GLubyte[texture->width*texture->height*cinfo.output_components], std::default_delete()); #endif //texture->type = GL_RGBA; texture->m_pImageData = /*std::shared_array */(new char[texture->m_nWidth*texture->m_nHeight*texture->m_nBpp / 8]); if(texture->m_pImageData == NULL) // If no space was allocated { //fclose(infile); // Close the file (void)jpeg_finish_decompress(&cinfo); jpeg_destroy_decompress(&cinfo); return false; // Return failed } /* We may need to do some setup of our own at this point before reading * the data. After jpeg_start_decompress() we have the correct scaled * output image dimensions available, as well as the output colormap * if we asked for color quantization. * In this example, we need to make an output work buffer of the right size. */ /* JSAMPLEs per row in output buffer */ row_stride = cinfo.output_width * cinfo.output_components; /* Make a one-row-high sample array that will go away when done with image */ buffer = (*cinfo.mem->alloc_sarray) ((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1); /* Step 6: while (scan lines remain to be read) */ /* jpeg_read_scanlines(...); */ /* Here we use the library's state variable cinfo.output_scanline as the * loop counter, so that we don't have to keep track ourselves. */ #if 0 int bufOffset = 0; int line =1; while (cinfo.output_scanline < cinfo.output_height) { /* jpeg_read_scanlines expects an array of pointers to scanlines. * Here the array is only one element long, but you could ask for * more than one scanline at a time if that's more convenient. */ (void) jpeg_read_scanlines(&cinfo, buffer, 1); /* Assume put_scanline_someplace wants a pointer and sample count. */ bufOffset = (cinfo.output_height-line)*row_stride; memcpy(texture->imageData+bufOffset,buffer[0],row_stride); //kuo line++; } #else int line =0; int pixels = 0; if (cinfo.jpeg_color_space == JCS_GRAYSCALE) { pixels = row_stride; } else { pixels = row_stride / 3; } while (cinfo.output_scanline < cinfo.output_height) { /* jpeg_read_scanlines expects an array of pointers to scanlines. * Here the array is only one element long, but you could ask for * more than one scanline at a time if that's more convenient. */ (void) jpeg_read_scanlines(&cinfo, buffer, 1); unsigned char* startBuffer = (unsigned char*)texture->m_pImageData+line*pixels*4; if (cinfo.jpeg_color_space == JCS_GRAYSCALE) { for (int i = 0; i < pixels; ++i) { startBuffer[i * 4 + 0] = buffer[0][i]; startBuffer[i * 4 + 1] = buffer[0][i]; startBuffer[i * 4 + 2] = buffer[0][i]; startBuffer[i * 4 + 3] = 255; } } else { for (int i = 0; i < pixels; ++i) { startBuffer[i * 4 + 0] = buffer[0][i * 3 + 0]; startBuffer[i * 4 + 1] = buffer[0][i * 3 + 1]; startBuffer[i * 4 + 2] = buffer[0][i * 3 + 2]; startBuffer[i * 4 + 3] = 255; } } /* Assume put_scanline_someplace wants a pointer and sample count. */ //memcpy(texture->imageData+line*row_stride,buffer[0],row_stride); //kuo line++; } #endif /* Step 7: Finish decompression */ (void) jpeg_finish_decompress(&cinfo); /* We can ignore the return value since suspension is not possible * with the stdio data source. */ /* Step 8: Release JPEG decompression object */ /* This is an important step since it will release a good deal of memory. */ jpeg_destroy_decompress(&cinfo); /* After finish_decompress, we can close the input file. * Here we postpone it until after no more JPEG errors are possible, * so as to simplify the setjmp error logic above. (Actually, I don't * think that jpeg_destroy can do an error exit, but why assume anything...) */ //fclose(infile); /* At this point you may want to check to see whether any corrupt-data * warnings occurred (test whether jerr.pub.num_warnings is nonzero). */ /* And we're done! */ return 1; } //------------------------------------------------------------------------------ bool LoadJpegWH( const char* p_sFileName,int& p_nWidth,int& p_nHeight ) { return true; } //保存jpeg图片，要求格式必须为rgb的 bool saveJpeg(int width ,int height,int bpp, char *buffer, int quality, const char*filename){ int components = bpp/8; if( components!=1 && components!=3 ) return false; jpeg_compress_struct jcs; jpeg_error_mgr jem; FILE *fp; JSAMPROW row_pointer[1];//?一行位图? int row_stride; //?每一行的字节数 jcs.err = jpeg_std_error(&jem); jpeg_create_compress(&jcs); fp = fopen(filename,"wb"); if(fp==NULL) return false; jpeg_stdio_dest(&jcs,fp); jcs.image_width = width; //位图的宽和高，单位为像素 jcs.image_height = height; jcs.input_components =components; //?在此为1,表示灰度图，?如果是彩色位图，则为3? jcs.in_color_space = components==3?JCS_RGB:JCS_GRAYSCALE;//JCS_GRAYSCALE表示灰度图，JCS_RGB表示彩色图像?? jpeg_set_defaults(&jcs); jpeg_set_quality(&jcs, quality, (boolean)true); jpeg_start_compress(&jcs,(boolean)true); row_stride = jcs.input_components*width; /* JSAMPLEs per row in image_buffer */ while(jcs.next_scanline < jcs.image_height){ row_pointer[0] = (JSAMPROW)&buffer[jcs.next_scanline * row_stride ]; jpeg_write_scanlines(&jcs, row_pointer, 1); } jpeg_finish_compress(&jcs); jpeg_destroy_compress(&jcs); fclose(fp); return true; } std::pair convertBitmapToJpeg(int uWidth, int uHeight, int bpp, unsigned char* pImg, int iQuality) { std::pair mRes = std::make_pair((unsigned char*)NULL, 0); int components = bpp / 8; if (components != 1 && components != 3) return mRes; jpeg_compress_struct jcInfo; jpeg_error_mgr jErr; jcInfo.err = jpeg_std_error(&jErr); jpeg_create_compress(&jcInfo); jpeg_mem_dest(&jcInfo, &mRes.first, &mRes.second); jcInfo.image_width = uWidth; jcInfo.image_height = uHeight; jcInfo.input_components = 3; jcInfo.in_color_space = JCS_RGB; jpeg_set_defaults(&jcInfo); jpeg_set_quality(&jcInfo, iQuality, TRUE); jpeg_start_compress(&jcInfo, TRUE); int iRowStride = jcInfo.image_width * jcInfo.input_components; while (jcInfo.next_scanline < jcInfo.image_height) { JSAMPROW pData = &(pImg[jcInfo.next_scanline * iRowStride]); jpeg_write_scanlines(&jcInfo, &pData, 1); } jpeg_finish_compress(&jcInfo); jpeg_destroy_compress(&jcInfo); return mRes; } std::pair convertBitmapToJpeg(const char* p_pData, int nWidth, int nHeight, int nBpp) { char* pData = (char*)p_pData; //32转24 if (nBpp == 32) { pData = new char[nWidth*nHeight * 3]; char* pSrc = (char*)p_pData; char* pDst = pData; for (int y = 0; y < nHeight; y++) { for (int x = 0; x < nWidth; x++) { pDst[0] = pSrc[0]; pDst[1] = pSrc[1]; pDst[2] = pSrc[2]; pSrc += 4; pDst += 3; } } } std::pair ret = convertBitmapToJpeg(nWidth, nHeight, 24, (unsigned char*)pData, 80); if (nBpp == 32) delete[] pData; return ret; } } //------------------------------------------------------------------------------ //-----------------------------END FILE--------------------------------