/* $TOG: jdlossy.c /main/5 1998/02/09 16:19:36 kaleb $ */ /* Module jdlossy.c */ /**************************************************************************** Copyright 1993, 1994, 1998 The Open Group All Rights Reserved. The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE OPEN GROUP BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. Except as contained in this notice, the name of The Open Group shall not be used in advertising or otherwise to promote the sale, use or other dealings in this Software without prior written authorization from The Open Group. NOTICE This software is being provided by AGE Logic, Inc. under the following license. By obtaining, using and/or copying this software, you agree that you have read, understood, and will comply with these terms and conditions: Permission to use, copy, modify, distribute and sell this software and its documentation for any purpose and without fee or royalty and to grant others any or all rights granted herein is hereby granted, provided that you agree to comply with the following copyright notice and statements, including the disclaimer, and that the same appears on all copies and derivative works of the software and documentation you make. "Copyright 1993, 1994 by AGE Logic, Inc." THIS SOFTWARE IS PROVIDED "AS IS". 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Title to this software shall at all times remain with AGE Logic, Inc. ***************************************************************************** jdlossy.c - decode JPEG images, Lossy method this contain code for: 1) JPEG Lossless, grayscale 2) JPEG Lossless, color Ben Fahy, AGE Logic, Oct 1993 Gary Rogers, AGE Logic, Inc., January 1994 ****************************************************************************/ #include "jpeg.h" /**********************************************************************/ decode_jpeg_lossy_gray(state) JpegDecodeState *state; { return( decode_jpeg_lossy_color(state) ); } /**********************************************************************/ decode_jpeg_lossy_color(state) JpegDecodeState *state; { int status; /* our output buffer is guaranteed to be clean on entry. */ /* (every time we write data below, we return to flush it) */ state->nl_found=0; state->nl_flushed=0; while(1) { /* loop forever (we're a state machine) */ switch( state->goal) { case JPEG_DECODE_GOAL_Startup: state->goal = JPEG_DECODE_GOAL_ReadDataForInit; case JPEG_DECODE_GOAL_ReadDataForInit: /* we start up by reading data into our buffer and calling INIT */ status = fill_jpeg_decode_buffer(state); switch(status) { case JPEG_BUFFER_LastBuffer: break; case JPEG_BUFFER_BufferFilled: /* all is coolness */ break; case JPEG_BUFFER_NeedAnotherStrip: state->needs_input_strip = 1; return(state->nl_found); break; case JPEG_BUFFER_BufferError: default: state->error_code = JPEG_DECODE_ERROR_CouldNotStart; return(-1); } /* if here, we should have a nice full input buffer */ case JPEG_DECODE_GOAL_TryToInit: status = JD_INIT(state->cinfo, state->dc_methods, state->e_methods, state->up_sample); if (status == XIE_ERR) { state->error_code = JPEG_DECODE_ERROR_CouldNotInit; return(-1); } if (status == XIE_NRML) { state->goal = JPEG_DECODE_GOAL_InitDone; break; } if (status == XIE_INP) { state->goal = JPEG_DECODE_GOAL_ReadDataForInit; break; } /* hey! we aren't supposed to be here */ state->error_code = JPEG_DECODE_ERROR_BadInitRetCode; return(-1); break; case JPEG_DECODE_GOAL_InitDone: /* now we know enough to allocate our output buffer */ state->cinfo->output_workspace = alloc_sampimage(state->cinfo, (int) state->cinfo->comps_in_scan, (long) state->cinfo->rows_in_mem, state->cinfo->image_width ); if (state->cinfo->output_workspace == NULL) { state->error_code = JPEG_DECODE_ERROR_BadOutputAlloc; return(-1); } state->goal = JPEG_DECODE_GOAL_ProcessData; case JPEG_DECODE_GOAL_ProcessData: status = JD_PROCESS(state->cinfo); if (status == XIE_INP) { state->goal = JPEG_DECODE_GOAL_ReadDataForProcess; break; } if (status == XIE_OUT) { state->goal = JPEG_DECODE_GOAL_WriteDataForProcess; break; } if (status == XIE_EOI) { state->goal = JPEG_DECODE_GOAL_EndOfInput; break; } if (status == XIE_NRML) break; if (status == XIE_ERR) { state->error_code = JPEG_DECODE_ERROR_DecodeError; return(-1); } else { /* unexpected return status */ state->error_code = JPEG_DECODE_ERROR_DecoderIsFreakingOut; return(-1); } break; case JPEG_DECODE_GOAL_ReadDataForProcess: status = fill_jpeg_decode_buffer(state); switch(status) { case JPEG_BUFFER_LastBuffer: break; case JPEG_BUFFER_BufferFilled: /* all is coolness */ break; case JPEG_BUFFER_NeedAnotherStrip: state->needs_input_strip = 1; return(state->nl_found); break; case JPEG_BUFFER_BufferError: default: state->error_code = JPEG_DECODE_ERROR_NoMoreProcessData; return(-1); } state->goal = JPEG_DECODE_GOAL_ProcessData; break; case JPEG_DECODE_GOAL_EndOfInput: state->goal = JPEG_DECODE_GOAL_Done; state->nl_found = (state->cinfo->image_height - state->cinfo->pixel_rows_output); /* see jdXIE_get() if this seems *too* self-serving */ /* leave for good */ return(state->nl_found); break; case JPEG_DECODE_GOAL_WriteDataForProcess: state->goal = JPEG_DECODE_GOAL_ProcessData; state->cinfo->pixel_rows_output += state->cinfo->rows_in_mem; state->nl_found = state->cinfo->rows_in_mem; /* leave to flush data */ return(state->nl_found); break; default: state->error_code = JPEG_DECODE_ERROR_BadGoal; return(-1); } } } /**********************************************************************/