1 /*! ========================================================================
4 ** $Id: mptr_jpeg.cpp,v 1.1.1.1 2005/01/04 01:23:11 darco Exp $
6 ** Copyright (c) 2002 Robert B. Quattlebaum Jr.
8 ** This software and associated documentation
9 ** are CONFIDENTIAL and PROPRIETARY property of
10 ** the above-mentioned copyright holder.
12 ** You may not copy, print, publish, or in any
13 ** other way distribute this software without
14 ** a prior written agreement with
15 ** the copyright holder.
17 ** === N O T E S ===========================================================
19 ** ========================================================================= */
21 /*! \todo Support 16 bit JPEG files
22 ** \todo Support for paletted JPEG files
23 ** \todo Support GAMMA correction
24 ** \todo Fix memory leaks
27 /* === H E A D E R S ======================================================= */
36 #include "mptr_jpeg.h"
37 #include <synfig/importer.h>
38 #include <synfig/time.h>
39 #include <synfig/general.h>
47 /* === M A C R O S ========================================================= */
49 using namespace synfig;
53 #define JPEG_CHECK_BYTES 8
55 /* === G L O B A L S ======================================================= */
57 SYNFIG_IMPORTER_INIT(jpeg_mptr);
58 SYNFIG_IMPORTER_SET_NAME(jpeg_mptr,"jpeg_mptr");
59 SYNFIG_IMPORTER_SET_EXT(jpeg_mptr,"jpg");
60 SYNFIG_IMPORTER_SET_VERSION(jpeg_mptr,"0.1");
61 SYNFIG_IMPORTER_SET_CVS_ID(jpeg_mptr,"$Id: mptr_jpeg.cpp,v 1.1.1.1 2005/01/04 01:23:11 darco Exp $");
63 /* === M E T H O D S ======================================================= */
66 struct jpeg_error_mgr pub; /* "public" fields */
68 jmp_buf setjmp_buffer; /* for return to caller */
71 typedef struct my_error_mgr * my_error_ptr;
74 * Here's the routine that will replace the standard error_exit method:
78 jpeg_mptr::my_error_exit (j_common_ptr cinfo)
80 /* cinfo->err really points to a my_error_mgr struct, so coerce pointer */
81 my_error_ptr myerr = (my_error_ptr) cinfo->err;
83 /* Always display the message. */
84 /* We could postpone this until after returning, if we chose. */
85 (*cinfo->err->output_message) (cinfo);
87 /* Return control to the setjmp point */
88 longjmp(myerr->setjmp_buffer, 1);
95 jpeg_mptr::jpeg_mptr(const char *file_name)
97 struct my_error_mgr jerr;
100 /* Open the file pointer */
101 FILE *file = fopen(file_name, "rb");
104 //! \todo THROW SOMETHING
105 throw String("error on importer construction, *WRITEME*1");
109 /* Step 1: allocate and initialize JPEG decompression object */
111 /* We set up the normal JPEG error routines, then override error_exit. */
112 cinfo.err = jpeg_std_error(&jerr.pub);
113 jerr.pub.error_exit = my_error_exit;
114 /* Establish the setjmp return context for my_error_exit to use. */
115 if (setjmp(jerr.setjmp_buffer)) {
116 /* If we get here, the JPEG code has signaled an error.
117 * We need to clean up the JPEG object, close the input file, and return.
119 jpeg_destroy_decompress(&cinfo);
121 throw String("error on importer construction, *WRITEME*2");
123 /* Now we can initialize the JPEG decompression object. */
124 jpeg_create_decompress(&cinfo);
126 /* Step 2: specify data source (eg, a file) */
128 jpeg_stdio_src(&cinfo, file);
130 /* Step 3: read file parameters with jpeg_read_header() */
132 (void) jpeg_read_header(&cinfo, TRUE);
133 /* We can ignore the return value from jpeg_read_header since
134 * (a) suspension is not possible with the stdio data source, and
135 * (b) we passed TRUE to reject a tables-only JPEG file as an error.
136 * See libjpeg.doc for more info.
139 /* Step 4: set parameters for decompression */
141 /* In this example, we don't need to change any of the defaults set by
142 * jpeg_read_header(), so we do nothing here.
145 /* Step 5: Start decompressor */
147 (void) jpeg_start_decompress(&cinfo);
148 /* We can ignore the return value since suspension is not possible
149 * with the stdio data source.
152 JSAMPARRAY buffer; /* Output row buffer */
153 int row_stride; /* physical row width in output buffer */
154 row_stride = cinfo.output_width * cinfo.output_components;
155 /* Make a one-row-high sample array that will go away when done with image */
156 buffer = (*cinfo.mem->alloc_sarray)((j_common_ptr) &cinfo, JPOOL_IMAGE, row_stride, 1);
160 synfig::error("jpeg_mptr: error: alloc of \"buffer\" failed (bug?)");
161 throw String("alloc of \"buffer\" failed (bug?)");
166 surface_buffer.set_wh(cinfo.output_width,cinfo.output_height);
168 switch(cinfo.output_components)
171 for(y=0;y<surface_buffer.get_h();y++)
174 jpeg_read_scanlines(&cinfo, buffer, 1);
175 for(x=0;x<surface_buffer.get_w();x++)
177 float r=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+0]);
178 float g=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+1]);
179 float b=gamma().g_U8_to_F32((unsigned char)buffer[0][x*3+2]);
180 surface_buffer[y][x]=Color(
187 surface_buffer[y][x]=Color(
188 (float)(unsigned char)buffer[0][x*3+0]*(1.0/255.0),
189 (float)(unsigned char)buffer[0][x*3+1]*(1.0/255.0),
190 (float)(unsigned char)buffer[0][x*3+2]*(1.0/255.0),
199 for(y=0;y<surface_buffer.get_h();y++)
201 jpeg_read_scanlines(&cinfo, buffer, 1);
202 for(x=0;x<surface_buffer.get_w();x++)
204 float gray=gamma().g_U8_to_F32((unsigned char)buffer[0][x]);
205 // float gray=(float)(unsigned char)buffer[0][x]*(1.0/255.0);
206 surface_buffer[y][x]=Color(
217 synfig::error("jpeg_mptr: error: Unsupported color type");
218 //! \todo THROW SOMETHING
219 throw String("error on importer construction, *WRITEME*6");
223 /* Step 7: Finish decompression */
225 (void) jpeg_finish_decompress(&cinfo);
226 /* We can ignore the return value since suspension is not possible
227 * with the stdio data source.
230 /* Step 8: Release JPEG decompression object */
232 /* This is an important step since it will release a good deal of memory. */
233 jpeg_destroy_decompress(&cinfo);
235 /* After finish_decompress, we can close the input file.
236 * Here we postpone it until after no more JPEG errors are possible,
237 * so as to simplify the setjmp error logic above. (Actually, I don't
238 * think that jpeg_destroy can do an error exit, but why assume anything...)
243 jpeg_mptr::~jpeg_mptr()
248 jpeg_mptr::get_frame(synfig::Surface &surface,Time, synfig::ProgressCallback *cb)
250 surface.mirror(surface_buffer);